/*
 *	Edit control
 *
 *	Copyright  David W. Metcalfe, 1994
 *	Copyright  William Magro, 1995, 1996
 *	Copyright  Frans van Dorsselaer, 1996, 1997
 *	Copyright  Frank Richter, 2005
 *
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 *
 * TODO:
 *   - EDITBALLOONTIP structure
 *   - EM_HIDEBALLOONTIP/Edit_HideBalloonTip
 *   - EM_SHOWBALLOONTIP/Edit_ShowBalloonTip
 *   - EN_ALIGN_LTR_EC
 *   - EN_ALIGN_RTL_EC
 *   - ES_OEMCONVERT
 *
 */

#include <stdarg.h>
#include <string.h>
#include <stdlib.h>

#include "windef.h"
#include "winbase.h"
#include "winnt.h"
#include "imm.h"
#include "usp10.h"
#include "commctrl.h"
#include "uxtheme.h"
#include "vsstyle.h"
#include "comctl32.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(edit);

#define BUFLIMIT_INITIAL    30000   /* initial buffer size */
#define GROWLENGTH		32	/* buffers granularity in bytes: must be power of 2 */
#define ROUND_TO_GROW(size)	(((size) + (GROWLENGTH - 1)) & ~(GROWLENGTH - 1))
#define HSCROLL_FRACTION	3	/* scroll window by 1/3 width */

/*
 *	extra flags for EDITSTATE.flags field
 */
#define EF_MODIFIED		0x0001	/* text has been modified */
#define EF_FOCUSED		0x0002	/* we have input focus */
#define EF_UPDATE		0x0004	/* notify parent of changed state */
#define EF_VSCROLL_TRACK	0x0008	/* don't SetScrollPos() since we are tracking the thumb */
#define EF_HSCROLL_TRACK	0x0010	/* don't SetScrollPos() since we are tracking the thumb */
#define EF_AFTER_WRAP		0x0080	/* the caret is displayed after the last character of a
					   wrapped line, instead of in front of the next character */
#define EF_USE_SOFTBRK		0x0100	/* Enable soft breaks in text. */
#define EF_DIALOGMODE           0x0200  /* Indicates that we are inside a dialog window */

#define ID_CB_LISTBOX 1000

typedef enum
{
	END_0 = 0,			/* line ends with terminating '\0' character */
	END_WRAP,			/* line is wrapped */
	END_HARD,			/* line ends with a hard return '\r\n' */
        END_SOFT,       		/* line ends with a soft return '\r\r\n' */
        END_RICH        		/* line ends with a single '\n' */
} LINE_END;

typedef struct tagLINEDEF {
	INT length;			/* bruto length of a line in bytes */
	INT net_length;			/* netto length of a line in visible characters */
	LINE_END ending;
	INT width;			/* width of the line in pixels */
	INT index; 			/* line index into the buffer */
	SCRIPT_STRING_ANALYSIS ssa;	/* Uniscribe Data */
	struct tagLINEDEF *next;
} LINEDEF;

typedef struct
{
	LPWSTR text;			/* the actual contents of the control */
        UINT text_length;               /* cached length of text buffer (in WCHARs) - use get_text_length() to retrieve */
	UINT buffer_size;		/* the size of the buffer in characters */
	UINT buffer_limit;		/* the maximum size to which the buffer may grow in characters */
	HFONT font;			/* NULL means standard system font */
	INT x_offset;			/* scroll offset	for multi lines this is in pixels
								for single lines it's in characters */
	INT line_height;		/* height of a screen line in pixels */
	INT char_width;			/* average character width in pixels */
	DWORD style;			/* sane version of wnd->dwStyle */
	WORD flags;			/* flags that are not in es->style or wnd->flags (EF_XXX) */
	INT undo_insert_count;		/* number of characters inserted in sequence */
	UINT undo_position;		/* character index of the insertion and deletion */
	LPWSTR undo_text;		/* deleted text */
	UINT undo_buffer_size;		/* size of the deleted text buffer */
	INT selection_start;		/* == selection_end if no selection */
	INT selection_end;		/* == current caret position */
	WCHAR password_char;		/* == 0 if no password char, and for multi line controls */
	INT left_margin;		/* in pixels */
	INT right_margin;		/* in pixels */
	RECT format_rect;
	INT text_width;			/* width of the widest line in pixels for multi line controls
					   and just line width for single line controls	*/
	INT region_posx;		/* Position of cursor relative to region: */
	INT region_posy;		/* -1: to left, 0: within, 1: to right */
	EDITWORDBREAKPROCW word_break_proc;
	INT line_count;			/* number of lines */
	INT y_offset;			/* scroll offset in number of lines */
	BOOL bCaptureState; 		/* flag indicating whether mouse was captured */
	BOOL bEnableState;		/* flag keeping the enable state */
	HWND hwndSelf;			/* the our window handle */
	HWND hwndParent;		/* Handle of parent for sending EN_* messages.
				           Even if parent will change, EN_* messages
					   should be sent to the first parent. */
	HWND hwndListBox;		/* handle of ComboBox's listbox or NULL */
	INT wheelDeltaRemainder;        /* scroll wheel delta left over after scrolling whole lines */
	WCHAR *cue_banner_text;
	BOOL cue_banner_draw_focused;

	/*
	 *	only for multi line controls
	 */
	INT lock_count;			/* amount of re-entries in the EditWndProc */
	INT tabs_count;
	LPINT tabs;
	LINEDEF *first_line_def;	/* linked list of (soft) linebreaks */
	HLOCAL hloc32W;			/* our unicode local memory block */
        HLOCAL hlocapp;                 /* The text buffer handle belongs to the app */
	/*
	 * IME Data
	 */
	UINT composition_len;   /* length of composition, 0 == no composition */
	int composition_start;  /* the character position for the composition */
        UINT ime_status;        /* IME status flag */
	/*
	 * Uniscribe Data
	 */
	SCRIPT_LOGATTR *logAttr;
	SCRIPT_STRING_ANALYSIS ssa; /* Uniscribe Data for single line controls */
} EDITSTATE;


#define SWAP_UINT32(x,y) do { UINT temp = (UINT)(x); (x) = (UINT)(y); (y) = temp; } while(0)
#define ORDER_UINT(x,y) do { if ((UINT)(y) < (UINT)(x)) SWAP_UINT32((x),(y)); } while(0)

static inline BOOL notify_parent(const EDITSTATE *es, INT code)
{
    HWND hwnd = es->hwndSelf;
    TRACE("notification %d sent to %p.\n", code, es->hwndParent);
    SendMessageW(es->hwndParent, WM_COMMAND, MAKEWPARAM(GetWindowLongPtrW(es->hwndSelf, GWLP_ID), code), (LPARAM)es->hwndSelf);
    return IsWindow(hwnd);
}

static LRESULT EDIT_EM_PosFromChar(EDITSTATE *es, INT index, BOOL after_wrap);

/*********************************************************************
 *
 *	EM_CANUNDO
 *
 */
static inline BOOL EDIT_EM_CanUndo(const EDITSTATE *es)
{
	return (es->undo_insert_count || lstrlenW(es->undo_text));
}


/*********************************************************************
 *
 *	EM_EMPTYUNDOBUFFER
 *
 */
static inline void EDIT_EM_EmptyUndoBuffer(EDITSTATE *es)
{
	es->undo_insert_count = 0;
	*es->undo_text = '\0';
}

static HBRUSH EDIT_NotifyCtlColor(EDITSTATE *es, HDC hdc)
{
    HBRUSH hbrush;
    UINT msg;

    if ((!es->bEnableState || (es->style & ES_READONLY)))
        msg = WM_CTLCOLORSTATIC;
    else
        msg = WM_CTLCOLOREDIT;

    /* Why do we notify to es->hwndParent, and we send this one to GetParent()? */
    hbrush = (HBRUSH)SendMessageW(GetParent(es->hwndSelf), msg, (WPARAM)hdc, (LPARAM)es->hwndSelf);
    if (!hbrush)
        hbrush = (HBRUSH)DefWindowProcW(GetParent(es->hwndSelf), msg, (WPARAM)hdc, (LPARAM)es->hwndSelf);
    return hbrush;
}


static inline UINT get_text_length(EDITSTATE *es)
{
    if(es->text_length == (UINT)-1)
        es->text_length = lstrlenW(es->text);
    return es->text_length;
}


/*********************************************************************
 *
 *	EDIT_WordBreakProc
 *
 *	Find the beginning of words.
 *	Note:	unlike the specs for a WordBreakProc, this function can
 *		only be called without linebreaks between s[0] up to
 *		s[count - 1].  Remember it is only called
 *		internally, so we can decide this for ourselves.
 *		Additionally we will always be breaking the full string.
 *
 */
static INT EDIT_WordBreakProc(EDITSTATE *es, LPWSTR s, INT index, INT count, INT action)
{
    INT ret = 0;

    TRACE("s=%p, index=%d, count=%d, action=%d\n", s, index, count, action);

    if(!s) return 0;

    if (!es->logAttr)
    {
        SCRIPT_ANALYSIS psa;

        memset(&psa,0,sizeof(SCRIPT_ANALYSIS));
        psa.eScript = SCRIPT_UNDEFINED;

        es->logAttr = Alloc(sizeof(SCRIPT_LOGATTR) * get_text_length(es));
        ScriptBreak(es->text, get_text_length(es), &psa, es->logAttr);
    }

    switch (action) {
    case WB_LEFT:
        if (index)
            index--;
        while (index && !es->logAttr[index].fSoftBreak)
            index--;
        ret = index;
        break;
    case WB_RIGHT:
        if (!count)
            break;
        while (index < count && s[index] && !es->logAttr[index].fSoftBreak)
            index++;
        ret = index;
        break;
    case WB_ISDELIMITER:
        ret = es->logAttr[index].fWhiteSpace;
        break;
    default:
        ERR("unknown action code, please report !\n");
        break;
    }
    return ret;
}


/*********************************************************************
 *
 *	EDIT_CallWordBreakProc
 *
 *	Call appropriate WordBreakProc (internal or external).
 *
 *	Note: The "start" argument should always be an index referring
 *		to es->text.  The actual wordbreak proc might be
 *		16 bit, so we can't always pass any 32 bit LPSTR.
 *		Hence we assume that es->text is the buffer that holds
 *		the string under examination (we can decide this for ourselves).
 *
 */
static INT EDIT_CallWordBreakProc(EDITSTATE *es, INT start, INT index, INT count, INT action)
{
    INT ret;

    if (es->word_break_proc)
        ret = es->word_break_proc(es->text + start, index, count, action);
    else
        ret = EDIT_WordBreakProc(es, es->text, index + start, count + start, action) - start;

    return ret;
}

static inline void EDIT_InvalidateUniscribeData_linedef(LINEDEF *line_def)
{
	if (line_def->ssa)
	{
		ScriptStringFree(&line_def->ssa);
		line_def->ssa = NULL;
	}
}

static inline void EDIT_InvalidateUniscribeData(EDITSTATE *es)
{
	LINEDEF *line_def = es->first_line_def;
	while (line_def)
	{
		EDIT_InvalidateUniscribeData_linedef(line_def);
		line_def = line_def->next;
	}
	if (es->ssa)
	{
		ScriptStringFree(&es->ssa);
		es->ssa = NULL;
	}
}

static SCRIPT_STRING_ANALYSIS EDIT_UpdateUniscribeData_linedef(EDITSTATE *es, HDC dc, LINEDEF *line_def)
{
	if (!line_def)
		return NULL;

	if (line_def->net_length && !line_def->ssa)
	{
		int index = line_def->index;
		HFONT old_font = NULL;
		HDC udc = dc;
		SCRIPT_TABDEF tabdef;
		HRESULT hr;

		if (!udc)
			udc = GetDC(es->hwndSelf);
		if (es->font)
			old_font = SelectObject(udc, es->font);

		tabdef.cTabStops = es->tabs_count;
		tabdef.iScale = GdiGetCharDimensions(udc, NULL, NULL);
		tabdef.pTabStops = es->tabs;
		tabdef.iTabOrigin = 0;

		hr = ScriptStringAnalyse(udc, &es->text[index], line_def->net_length,
                                         (1.5*line_def->net_length+16), -1,
                                         SSA_LINK|SSA_FALLBACK|SSA_GLYPHS|SSA_TAB, -1,
                                         NULL, NULL, NULL, &tabdef, NULL, &line_def->ssa);
		if (FAILED(hr))
		{
			WARN("ScriptStringAnalyse failed, hr %#lx.\n", hr);
			line_def->ssa = NULL;
		}

		if (es->font)
			SelectObject(udc, old_font);
		if (udc != dc)
			ReleaseDC(es->hwndSelf, udc);
	}

	return line_def->ssa;
}

static SCRIPT_STRING_ANALYSIS EDIT_UpdateUniscribeData(EDITSTATE *es, HDC dc, INT line)
{
	LINEDEF *line_def;

	if (!(es->style & ES_MULTILINE))
	{
		if (!es->ssa)
		{
			INT length = get_text_length(es);
			HFONT old_font = NULL;
			HDC udc = dc;

			if (!udc)
				udc = GetDC(es->hwndSelf);
			if (es->font)
				old_font = SelectObject(udc, es->font);

			if (es->style & ES_PASSWORD)
				ScriptStringAnalyse(udc, &es->password_char, length, (1.5*length+16), -1, SSA_LINK|SSA_FALLBACK|SSA_GLYPHS|SSA_PASSWORD, -1, NULL, NULL, NULL, NULL, NULL, &es->ssa);
			else
				ScriptStringAnalyse(udc, es->text, length, (1.5*length+16), -1, SSA_LINK|SSA_FALLBACK|SSA_GLYPHS, -1, NULL, NULL, NULL, NULL, NULL, &es->ssa);

			if (es->font)
				SelectObject(udc, old_font);
			if (udc != dc)
				ReleaseDC(es->hwndSelf, udc);
		}
		return es->ssa;
	}
	else
	{
		line_def = es->first_line_def;
		while (line_def && line)
		{
			line_def = line_def->next;
			line--;
		}

		return EDIT_UpdateUniscribeData_linedef(es,dc,line_def);
	}
}

static inline INT get_vertical_line_count(EDITSTATE *es)
{
	INT vlc = es->line_height ? (es->format_rect.bottom - es->format_rect.top) / es->line_height : 0;
	return max(1,vlc);
}

/*********************************************************************
 *
 *	EDIT_BuildLineDefs_ML
 *
 *	Build linked list of text lines.
 *	Lines can end with '\0' (last line), a character (if it is wrapped),
 *	a soft return '\r\r\n' or a hard return '\r\n'
 *
 */
static void EDIT_BuildLineDefs_ML(EDITSTATE *es, INT istart, INT iend, INT delta, HRGN hrgn)
{
	LPWSTR current_position, cp;
	INT fw;
	LINEDEF *current_line;
	LINEDEF *previous_line;
	LINEDEF *start_line;
	INT line_index = 0, nstart_line, nstart_index;
	INT line_count = es->line_count;
	INT orig_net_length;
	RECT rc;
	INT vlc;

	if (istart == iend && delta == 0)
		return;

	previous_line = NULL;
	current_line = es->first_line_def;

	/* Find starting line. istart must lie inside an existing line or
	 * at the end of buffer */
	do {
		if (istart < current_line->index + current_line->length ||
				current_line->ending == END_0)
			break;

		previous_line = current_line;
		current_line = current_line->next;
		line_index++;
	} while (current_line);

	if (!current_line) /* Error occurred start is not inside previous buffer */
	{
		FIXME(" modification occurred outside buffer\n");
		return;
	}

	/* Remember start of modifications in order to calculate update region */
	nstart_line = line_index;
	nstart_index = current_line->index;

	/* We must start to reformat from the previous line since the modifications
	 * may have caused the line to wrap upwards. */
	if (!(es->style & ES_AUTOHSCROLL) && line_index > 0)
	{
		line_index--;
		current_line = previous_line;
	}
	start_line = current_line;

	fw = es->format_rect.right - es->format_rect.left;
	current_position = es->text + current_line->index;
	vlc = get_vertical_line_count(es);
	do {
		if (current_line != start_line)
		{
			if (!current_line || current_line->index + delta > current_position - es->text)
			{
				/* The buffer has been expanded, create a new line and
				   insert it into the link list */
				LINEDEF *new_line = Alloc(sizeof(*new_line));
				new_line->next = previous_line->next;
				previous_line->next = new_line;
				current_line = new_line;
				es->line_count++;
			}
			else if (current_line->index + delta < current_position - es->text)
			{
				/* The previous line merged with this line so we delete this extra entry */
				previous_line->next = current_line->next;
				Free(current_line);
				current_line = previous_line->next;
				es->line_count--;
				continue;
			}
			else /* current_line->index + delta == current_position */
			{
				if (current_position - es->text > iend)
					break; /* We reached end of line modifications */
				/* else recalculate this line */
			}
		}

		current_line->index = current_position - es->text;
		orig_net_length = current_line->net_length;

		/* Find end of line */
		cp = current_position;
		while (*cp) {
                    if (*cp == '\n') break;
                    if ((*cp == '\r') && (*(cp + 1) == '\n'))
                        break;
                    cp++;
		}

		/* Mark type of line termination */
		if (!(*cp)) {
			current_line->ending = END_0;
			current_line->net_length = lstrlenW(current_position);
		} else if ((cp > current_position) && (*(cp - 1) == '\r')) {
			current_line->ending = END_SOFT;
			current_line->net_length = cp - current_position - 1;
                } else if (*cp == '\n') {
			current_line->ending = END_RICH;
			current_line->net_length = cp - current_position;
		} else {
			current_line->ending = END_HARD;
			current_line->net_length = cp - current_position;
		}

		if (current_line->net_length)
		{
			const SIZE *sz;
			EDIT_InvalidateUniscribeData_linedef(current_line);
			EDIT_UpdateUniscribeData_linedef(es, NULL, current_line);
			if (current_line->ssa)
			{
				sz = ScriptString_pSize(current_line->ssa);
				/* Calculate line width */
				current_line->width = sz->cx;
			}
			else current_line->width = es->char_width * current_line->net_length;
		}
		else current_line->width = 0;

		/* FIXME: check here for lines that are too wide even in AUTOHSCROLL (> 32767 ???) */

/* Line breaks just look back from the end and find the next break and try that. */

		if (!(es->style & ES_AUTOHSCROLL)) {
		   if (current_line->width > fw && fw > es->char_width) {

			INT prev, next;
			int w;
			const SIZE *sz;
			float d;

			prev = current_line->net_length - 1;
			w = current_line->net_length;
			d = (float)current_line->width/(float)fw;
			if (d > 1.2f) d -= 0.2f;
			next = prev/d;
			if (next >= prev) next = prev-1;
			do {
				prev = EDIT_CallWordBreakProc(es, current_position - es->text,
						next, current_line->net_length, WB_LEFT);
				current_line->net_length = prev;
				EDIT_InvalidateUniscribeData_linedef(current_line);
				EDIT_UpdateUniscribeData_linedef(es, NULL, current_line);
				if (current_line->ssa)
					sz = ScriptString_pSize(current_line->ssa);
				else sz = 0;
				if (sz)
					current_line->width = sz->cx;
				else
					prev = 0;
				next = prev - 1;
			} while (prev && current_line->width > fw);
			current_line->net_length = w;

			if (prev == 0) { /* Didn't find a line break so force a break */
				INT *piDx;
				const INT *count;

				EDIT_InvalidateUniscribeData_linedef(current_line);
				EDIT_UpdateUniscribeData_linedef(es, NULL, current_line);

				if (current_line->ssa)
				{
					count = ScriptString_pcOutChars(current_line->ssa);
					piDx = Alloc(sizeof(INT) * (*count));
					ScriptStringGetLogicalWidths(current_line->ssa,piDx);

					prev = current_line->net_length-1;
					do {
						current_line->width -= piDx[prev];
						prev--;
					} while ( prev > 0 && current_line->width > fw);
					if (prev<=0)
						prev = 1;
					Free(piDx);
				}
				else
					prev = (fw / es->char_width);
			}

			/* If the first line we are calculating, wrapped before istart, we must
			 * adjust istart in order for this to be reflected in the update region. */
			if (current_line->index == nstart_index && istart > current_line->index + prev)
				istart = current_line->index + prev;
			/* else if we are updating the previous line before the first line we
			 * are re-calculating and it expanded */
			else if (current_line == start_line &&
					current_line->index != nstart_index && orig_net_length < prev)
			{
			  /* Line expanded due to an upwards line wrap so we must partially include
			   * previous line in update region */
				nstart_line = line_index;
				nstart_index = current_line->index;
				istart = current_line->index + orig_net_length;
			}

			current_line->net_length = prev;
			current_line->ending = END_WRAP;

			if (current_line->net_length > 0)
			{
				EDIT_UpdateUniscribeData_linedef(es, NULL, current_line);
				if (current_line->ssa)
				{
					sz = ScriptString_pSize(current_line->ssa);
					current_line->width = sz->cx;
				}
				else
					current_line->width = 0;
			}
			else current_line->width = 0;
		    }
		    else if (current_line == start_line &&
                             current_line->index != nstart_index &&
                             orig_net_length < current_line->net_length) {
			/* The previous line expanded but it's still not as wide as the client rect */
			/* The expansion is due to an upwards line wrap so we must partially include
			   it in the update region */
			nstart_line = line_index;
			nstart_index = current_line->index;
			istart = current_line->index + orig_net_length;
		    }
		}


		/* Adjust length to include line termination */
		switch (current_line->ending) {
		case END_SOFT:
			current_line->length = current_line->net_length + 3;
			break;
                case END_RICH:
			current_line->length = current_line->net_length + 1;
			break;
		case END_HARD:
			current_line->length = current_line->net_length + 2;
			break;
		case END_WRAP:
		case END_0:
			current_line->length = current_line->net_length;
			break;
		}
		es->text_width = max(es->text_width, current_line->width);
		current_position += current_line->length;
		previous_line = current_line;

		/* Discard data for non-visible lines. It will be calculated as needed */
		if ((line_index < es->y_offset) || (line_index > es->y_offset + vlc))
			EDIT_InvalidateUniscribeData_linedef(current_line);

		current_line = current_line->next;
		line_index++;
	} while (previous_line->ending != END_0);

	/* Finish adjusting line indexes by delta or remove hanging lines */
	if (previous_line->ending == END_0)
	{
		LINEDEF *pnext = NULL;

		previous_line->next = NULL;
		while (current_line)
		{
			pnext = current_line->next;
			EDIT_InvalidateUniscribeData_linedef(current_line);
			Free(current_line);
			current_line = pnext;
			es->line_count--;
		}
	}
	else if (delta != 0)
	{
		while (current_line)
		{
			current_line->index += delta;
			current_line = current_line->next;
		}
	}

	/* Calculate rest of modification rectangle */
	if (hrgn)
	{
		HRGN tmphrgn;
	   /*
		* We calculate two rectangles. One for the first line which may have
		* an indent with respect to the format rect. The other is a format-width
		* rectangle that spans the rest of the lines that changed or moved.
		*/
		rc.top = es->format_rect.top + nstart_line * es->line_height -
			(es->y_offset * es->line_height); /* Adjust for vertical scrollbar */
		rc.bottom = rc.top + es->line_height;
		if ((es->style & ES_CENTER) || (es->style & ES_RIGHT))
			rc.left = es->format_rect.left;
		else
                        rc.left = LOWORD(EDIT_EM_PosFromChar(es, nstart_index, FALSE));
		rc.right = es->format_rect.right;
		SetRectRgn(hrgn, rc.left, rc.top, rc.right, rc.bottom);

		rc.top = rc.bottom;
		rc.left = es->format_rect.left;
		rc.right = es->format_rect.right;
	   /*
		* If lines were added or removed we must re-paint the remainder of the
	    * lines since the remaining lines were either shifted up or down.
		*/
		if (line_count < es->line_count) /* We added lines */
			rc.bottom = es->line_count * es->line_height;
		else if (line_count > es->line_count) /* We removed lines */
			rc.bottom = line_count * es->line_height;
		else
			rc.bottom = line_index * es->line_height;
		rc.bottom += es->format_rect.top;
		rc.bottom -= (es->y_offset * es->line_height); /* Adjust for vertical scrollbar */
		tmphrgn = CreateRectRgn(rc.left, rc.top, rc.right, rc.bottom);
		CombineRgn(hrgn, hrgn, tmphrgn, RGN_OR);
		DeleteObject(tmphrgn);
	}
}

/*********************************************************************
 *
 *	EDIT_CalcLineWidth_SL
 *
 */
static void EDIT_CalcLineWidth_SL(EDITSTATE *es)
{
	EDIT_UpdateUniscribeData(es, NULL, 0);
	if (es->ssa)
	{
		const SIZE *size;
		size = ScriptString_pSize(es->ssa);
		es->text_width = size->cx;
	}
	else
		es->text_width = 0;
}

/*********************************************************************
 *
 *	EDIT_CharFromPos
 *
 *	Beware: This is not the function called on EM_CHARFROMPOS
 *		The position _can_ be outside the formatting / client
 *		rectangle
 *		The return value is only the character index
 *
 */
static INT EDIT_CharFromPos(EDITSTATE *es, INT x, INT y, LPBOOL after_wrap)
{
	INT index;

	if (es->style & ES_MULTILINE) {
		int trailing;
		INT line = (y - es->format_rect.top) / es->line_height + es->y_offset;
		INT line_index = 0;
		LINEDEF *line_def = es->first_line_def;
		EDIT_UpdateUniscribeData(es, NULL, line);
		while ((line > 0) && line_def->next) {
			line_index += line_def->length;
			line_def = line_def->next;
			line--;
		}

		x += es->x_offset - es->format_rect.left;
		if (es->style & ES_RIGHT)
			x -= (es->format_rect.right - es->format_rect.left) - line_def->width;
		else if (es->style & ES_CENTER)
			x -= ((es->format_rect.right - es->format_rect.left) - line_def->width) / 2;
		if (x >= line_def->width) {
			if (after_wrap)
				*after_wrap = (line_def->ending == END_WRAP);
			return line_index + line_def->net_length;
		}
		if (x <= 0 || !line_def->ssa) {
			if (after_wrap)
				*after_wrap = FALSE;
			return line_index;
		}

		ScriptStringXtoCP(line_def->ssa, x , &index, &trailing);
		if (trailing) index++;
		index += line_index;
		if (after_wrap)
			*after_wrap = ((index == line_index + line_def->net_length) &&
							(line_def->ending == END_WRAP));
	} else {
		INT xoff = 0;
		INT trailing;
		if (after_wrap)
			*after_wrap = FALSE;
		x -= es->format_rect.left;
		if (!x)
			return es->x_offset;

		if (!es->x_offset)
		{
			INT indent = (es->format_rect.right - es->format_rect.left) - es->text_width;
			if (es->style & ES_RIGHT)
				x -= indent;
			else if (es->style & ES_CENTER)
				x -= indent / 2;
		}

		EDIT_UpdateUniscribeData(es, NULL, 0);
		if (es->x_offset)
		{
			if (es->ssa)
			{
				if (es->x_offset>= get_text_length(es))
				{
					const SIZE *size;
					size = ScriptString_pSize(es->ssa);
					xoff = size->cx;
				}
				ScriptStringCPtoX(es->ssa, es->x_offset, FALSE, &xoff);
			}
			else
				xoff = 0;
		}
		if (x < 0)
		{
			if (x + xoff > 0 || !es->ssa)
			{
				ScriptStringXtoCP(es->ssa, x+xoff, &index, &trailing);
				if (trailing) index++;
			}
			else
				index = 0;
		}
		else
		{
			if (x)
			{
				const SIZE *size = NULL;
				if (es->ssa)
					size = ScriptString_pSize(es->ssa);
				if (!size)
					index = 0;
				else if (x > size->cx)
					index = get_text_length(es);
				else if (es->ssa)
				{
					ScriptStringXtoCP(es->ssa, x+xoff, &index, &trailing);
					if (trailing) index++;
				}
				else
					index = 0;
			}
			else
				index = es->x_offset;
		}
	}
	return index;
}


/*********************************************************************
 *
 *	EDIT_ConfinePoint
 *
 *	adjusts the point to be within the formatting rectangle
 *	(so CharFromPos returns the nearest _visible_ character)
 *
 */
static void EDIT_ConfinePoint(const EDITSTATE *es, LPINT x, LPINT y)
{
	*x = min(max(*x, es->format_rect.left), es->format_rect.right - 1);
	*y = min(max(*y, es->format_rect.top), es->format_rect.bottom - 1);
}


/*********************************************************************
 *
 *	EM_LINEFROMCHAR
 *
 */
static INT EDIT_EM_LineFromChar(EDITSTATE *es, INT index)
{
	INT line;
	LINEDEF *line_def;

	if (!(es->style & ES_MULTILINE))
		return 0;
	if (index > (INT)get_text_length(es))
		return es->line_count - 1;
	if (index == -1)
		index = min(es->selection_start, es->selection_end);

	line = 0;
	line_def = es->first_line_def;
	index -= line_def->length;
	while ((index >= 0) && line_def->next) {
		line++;
		line_def = line_def->next;
		index -= line_def->length;
	}
	return line;
}


/*********************************************************************
 *
 *	EM_LINEINDEX
 *
 */
static INT EDIT_EM_LineIndex(const EDITSTATE *es, INT line)
{
	INT line_index;
	const LINEDEF *line_def;

	if (!(es->style & ES_MULTILINE))
		return 0;
	if (line >= es->line_count)
		return -1;

	line_index = 0;
	line_def = es->first_line_def;
	if (line == -1) {
		INT index = es->selection_end - line_def->length;
		while ((index >= 0) && line_def->next) {
			line_index += line_def->length;
			line_def = line_def->next;
			index -= line_def->length;
		}
	} else {
		while (line > 0) {
			line_index += line_def->length;
			line_def = line_def->next;
			line--;
		}
	}
	return line_index;
}


/*********************************************************************
 *
 *	EM_LINELENGTH
 *
 */
static INT EDIT_EM_LineLength(EDITSTATE *es, INT index)
{
	LINEDEF *line_def;

	if (!(es->style & ES_MULTILINE))
		return get_text_length(es);

	if (index == -1) {
		/* get the number of remaining non-selected chars of selected lines */
		INT32 l; /* line number */
		INT32 li; /* index of first char in line */
		INT32 count;
		l = EDIT_EM_LineFromChar(es, es->selection_start);
		/* # chars before start of selection area */
		count = es->selection_start - EDIT_EM_LineIndex(es, l);
		l = EDIT_EM_LineFromChar(es, es->selection_end);
		/* # chars after end of selection */
		li = EDIT_EM_LineIndex(es, l);
		count += li + EDIT_EM_LineLength(es, li) - es->selection_end;
		return count;
	}
	line_def = es->first_line_def;
	index -= line_def->length;
	while ((index >= 0) && line_def->next) {
		line_def = line_def->next;
		index -= line_def->length;
	}
	return line_def->net_length;
}


/*********************************************************************
 *
 *	EM_POSFROMCHAR
 *
 */
static LRESULT EDIT_EM_PosFromChar(EDITSTATE *es, INT index, BOOL after_wrap)
{
	INT len = get_text_length(es);
	INT l;
	INT li;
	INT x = 0;
	INT y = 0;
	INT w;
	INT lw;
	LINEDEF *line_def;

	index = min(index, len);
	if (es->style & ES_MULTILINE) {
		l = EDIT_EM_LineFromChar(es, index);
		EDIT_UpdateUniscribeData(es, NULL, l);

		y = (l - es->y_offset) * es->line_height;
		li = EDIT_EM_LineIndex(es, l);
		if (after_wrap && (li == index) && l) {
			INT l2 = l - 1;
			line_def = es->first_line_def;
			while (l2) {
				line_def = line_def->next;
				l2--;
			}
			if (line_def->ending == END_WRAP) {
				l--;
				y -= es->line_height;
				li = EDIT_EM_LineIndex(es, l);
			}
		}

		line_def = es->first_line_def;
		while (line_def->index != li)
			line_def = line_def->next;

		lw = line_def->width;
		w = es->format_rect.right - es->format_rect.left;
		if (line_def->ssa)
			ScriptStringCPtoX(line_def->ssa, (index - 1) - li, TRUE, &x);
		x -= es->x_offset;

		if (es->style & ES_RIGHT)
			x = w - (lw - x);
		else if (es->style & ES_CENTER)
			x += (w - lw) / 2;
	} else {
		INT xoff = 0;
		INT xi = 0;
		EDIT_UpdateUniscribeData(es, NULL, 0);
		if (es->x_offset)
		{
			if (es->ssa)
			{
				if (es->x_offset >= get_text_length(es))
				{
					int leftover = es->x_offset - get_text_length(es);
					if (es->ssa)
					{
						const SIZE *size;
						size = ScriptString_pSize(es->ssa);
						xoff = size->cx;
					}
					else
						xoff = 0;
					xoff += es->char_width * leftover;
				}
				else
					ScriptStringCPtoX(es->ssa, es->x_offset, FALSE, &xoff);
			}
			else
				xoff = 0;
		}
		if (index)
		{
			if (index >= get_text_length(es))
			{
				if (es->ssa)
				{
					const SIZE *size;
					size = ScriptString_pSize(es->ssa);
					xi = size->cx;
				}
				else
					xi = 0;
			}
			else if (es->ssa)
				ScriptStringCPtoX(es->ssa, index, FALSE, &xi);
			else
				xi = 0;
		}
		x = xi - xoff;

		if (index >= es->x_offset) {
			if (!es->x_offset && (es->style & (ES_RIGHT | ES_CENTER)))
			{
				w = es->format_rect.right - es->format_rect.left;
				if (w > es->text_width)
				{
					if (es->style & ES_RIGHT)
						x += w - es->text_width;
					else if (es->style & ES_CENTER)
						x += (w - es->text_width) / 2;
				}
			}
		}
		y = 0;
	}
	x += es->format_rect.left;
	y += es->format_rect.top;
	return MAKELONG((INT16)x, (INT16)y);
}


/*********************************************************************
 *
 *	EDIT_GetLineRect
 *
 *	Calculates the bounding rectangle for a line from a starting
 *	column to an ending column.
 *
 */
static void EDIT_GetLineRect(EDITSTATE *es, INT line, INT scol, INT ecol, LPRECT rc)
{
	SCRIPT_STRING_ANALYSIS ssa;
	INT line_index = 0;
	INT pt1, pt2, pt3;

	if (es->style & ES_MULTILINE)
	{
		const LINEDEF *line_def = NULL;
		rc->top = es->format_rect.top + (line - es->y_offset) * es->line_height;
		if (line >= es->line_count)
			return;

		line_def = es->first_line_def;
		if (line == -1) {
			INT index = es->selection_end - line_def->length;
			while ((index >= 0) && line_def->next) {
				line_index += line_def->length;
				line_def = line_def->next;
				index -= line_def->length;
			}
		} else {
			while (line > 0) {
				line_index += line_def->length;
				line_def = line_def->next;
				line--;
			}
		}
		ssa = line_def->ssa;
	}
	else
	{
		line_index = 0;
		rc->top = es->format_rect.top;
		ssa = es->ssa;
	}

	rc->bottom = rc->top + es->line_height;
	pt1 = (scol == 0) ? es->format_rect.left : (short)LOWORD(EDIT_EM_PosFromChar(es, line_index + scol, TRUE));
	pt2 = (ecol == -1) ? es->format_rect.right : (short)LOWORD(EDIT_EM_PosFromChar(es, line_index + ecol, TRUE));
	if (ssa)
	{
		ScriptStringCPtoX(ssa, scol, FALSE, &pt3);
		pt3+=es->format_rect.left;
	}
	else pt3 = pt1;
	rc->right = max(max(pt1 , pt2),pt3);
	rc->left = min(min(pt1, pt2),pt3);
}


static inline void text_buffer_changed(EDITSTATE *es)
{
    es->text_length = (UINT)-1;

    Free(es->logAttr);
    es->logAttr = NULL;
    EDIT_InvalidateUniscribeData(es);
}

/*********************************************************************
 * EDIT_LockBuffer
 *
 */
static void EDIT_LockBuffer(EDITSTATE *es)
{
    if (!es->text)
    {
        if (!es->hloc32W)
            return;

        es->text = LocalLock(es->hloc32W);
    }

    es->lock_count++;
}


/*********************************************************************
 *
 *	EDIT_UnlockBuffer
 *
 */
static void EDIT_UnlockBuffer(EDITSTATE *es, BOOL force)
{
    /* Edit window might be already destroyed */
    if (!IsWindow(es->hwndSelf))
    {
        WARN("edit hwnd %p already destroyed\n", es->hwndSelf);
        return;
    }

    if (!es->lock_count)
    {
        ERR("lock_count == 0 ... please report\n");
        return;
    }

    if (!es->text)
    {
        ERR("es->text == 0 ... please report\n");
        return;
    }

    if (force || (es->lock_count == 1))
    {
        if (es->hloc32W)
        {
            LocalUnlock(es->hloc32W);
            es->text = NULL;
        }
        else
        {
            ERR("no buffer ... please report\n");
            return;
        }

    }

    es->lock_count--;
}


/*********************************************************************
 *
 *	EDIT_MakeFit
 *
 * Try to fit size + 1 characters in the buffer.
 */
static BOOL EDIT_MakeFit(EDITSTATE *es, UINT size)
{
	HLOCAL hNew32W;

	if (size <= es->buffer_size)
		return TRUE;

	TRACE("trying to ReAlloc to %d+1 characters\n", size);

        /* Force edit to unlock its buffer. es->text now NULL */
	EDIT_UnlockBuffer(es, TRUE);

	if (es->hloc32W) {
	    UINT alloc_size = ROUND_TO_GROW((size + 1) * sizeof(WCHAR));
	    if ((hNew32W = LocalReAlloc(es->hloc32W, alloc_size, LMEM_MOVEABLE | LMEM_ZEROINIT))) {
		TRACE("Old 32 bit handle %p, new handle %p\n", es->hloc32W, hNew32W);
		es->hloc32W = hNew32W;
		es->buffer_size = LocalSize(hNew32W)/sizeof(WCHAR) - 1;
	    }
	}

	EDIT_LockBuffer(es);

	if (es->buffer_size < size) {
		WARN("FAILED !  We now have %d+1\n", es->buffer_size);
		notify_parent(es, EN_ERRSPACE);
		return FALSE;
	} else {
		TRACE("We now have %d+1\n", es->buffer_size);
		return TRUE;
	}
}


/*********************************************************************
 *
 *	EDIT_MakeUndoFit
 *
 *	Try to fit size + 1 bytes in the undo buffer.
 *
 */
static BOOL EDIT_MakeUndoFit(EDITSTATE *es, UINT size)
{
	UINT alloc_size;
	WCHAR *new_undo_text;

	if (size <= es->undo_buffer_size)
		return TRUE;

	TRACE("trying to ReAlloc to %d+1\n", size);

	alloc_size = ROUND_TO_GROW((size + 1) * sizeof(WCHAR));
	if ((new_undo_text = ReAlloc(es->undo_text, alloc_size))) {
		memset(new_undo_text + es->undo_buffer_size, 0, alloc_size - es->undo_buffer_size * sizeof(WCHAR));
		es->undo_text = new_undo_text;
		es->undo_buffer_size = alloc_size/sizeof(WCHAR) - 1;
		return TRUE;
	}
	else
	{
		WARN("FAILED !  We now have %d+1\n", es->undo_buffer_size);
		return FALSE;
	}
}


/*********************************************************************
 *
 *	EDIT_UpdateTextRegion
 *
 */
static void EDIT_UpdateTextRegion(EDITSTATE *es, HRGN hrgn, BOOL bErase)
{
    if (es->flags & EF_UPDATE) {
        es->flags &= ~EF_UPDATE;
        if (!notify_parent(es, EN_UPDATE)) return;
    }
    InvalidateRgn(es->hwndSelf, hrgn, bErase);
}


/*********************************************************************
 *
 *	EDIT_UpdateText
 *
 */
static void EDIT_UpdateText(EDITSTATE *es, const RECT *rc, BOOL bErase)
{
    if (es->flags & EF_UPDATE) {
        es->flags &= ~EF_UPDATE;
        if (!notify_parent(es, EN_UPDATE)) return;
    }
    InvalidateRect(es->hwndSelf, rc, bErase);
}

/*********************************************************************
 *
 *	EDIT_SL_InvalidateText
 *
 *	Called from EDIT_InvalidateText().
 *	Does the job for single-line controls only.
 *
 */
static void EDIT_SL_InvalidateText(EDITSTATE *es, INT start, INT end)
{
	RECT line_rect;
	RECT rc;

	EDIT_GetLineRect(es, 0, start, end, &line_rect);
	if (IntersectRect(&rc, &line_rect, &es->format_rect))
		EDIT_UpdateText(es, &rc, TRUE);
}

/*********************************************************************
 *
 *	EDIT_ML_InvalidateText
 *
 *	Called from EDIT_InvalidateText().
 *	Does the job for multi-line controls only.
 *
 */
static void EDIT_ML_InvalidateText(EDITSTATE *es, INT start, INT end)
{
	INT vlc = get_vertical_line_count(es);
	INT sl = EDIT_EM_LineFromChar(es, start);
	INT el = EDIT_EM_LineFromChar(es, end);
	INT sc;
	INT ec;
	RECT rc1;
	RECT rcWnd;
	RECT rcLine;
	RECT rcUpdate;
	INT l;

	if ((el < es->y_offset) || (sl > es->y_offset + vlc))
		return;

	sc = start - EDIT_EM_LineIndex(es, sl);
	ec = end - EDIT_EM_LineIndex(es, el);
	if (sl < es->y_offset) {
		sl = es->y_offset;
		sc = 0;
	}
	if (el > es->y_offset + vlc) {
		el = es->y_offset + vlc;
		ec = EDIT_EM_LineLength(es, EDIT_EM_LineIndex(es, el));
	}
	GetClientRect(es->hwndSelf, &rc1);
	IntersectRect(&rcWnd, &rc1, &es->format_rect);
	if (sl == el) {
		EDIT_GetLineRect(es, sl, sc, ec, &rcLine);
		if (IntersectRect(&rcUpdate, &rcWnd, &rcLine))
			EDIT_UpdateText(es, &rcUpdate, TRUE);
	} else {
		EDIT_GetLineRect(es, sl, sc,
				EDIT_EM_LineLength(es,
					EDIT_EM_LineIndex(es, sl)),
				&rcLine);
		if (IntersectRect(&rcUpdate, &rcWnd, &rcLine))
			EDIT_UpdateText(es, &rcUpdate, TRUE);
		for (l = sl + 1 ; l < el ; l++) {
			EDIT_GetLineRect(es, l, 0,
				EDIT_EM_LineLength(es,
					EDIT_EM_LineIndex(es, l)),
				&rcLine);
			if (IntersectRect(&rcUpdate, &rcWnd, &rcLine))
				EDIT_UpdateText(es, &rcUpdate, TRUE);
		}
		EDIT_GetLineRect(es, el, 0, ec, &rcLine);
		if (IntersectRect(&rcUpdate, &rcWnd, &rcLine))
			EDIT_UpdateText(es, &rcUpdate, TRUE);
	}
}


/*********************************************************************
 *
 *	EDIT_InvalidateText
 *
 *	Invalidate the text from offset start up to, but not including,
 *	offset end.  Useful for (re)painting the selection.
 *	Regions outside the linewidth are not invalidated.
 *	end == -1 means end == TextLength.
 *	start and end need not be ordered.
 *
 */
static void EDIT_InvalidateText(EDITSTATE *es, INT start, INT end)
{
	if (end == start)
		return;

	if (end == -1)
		end = get_text_length(es);

	if (end < start) {
	    INT tmp = start;
	    start = end;
	    end = tmp;
	}

	if (es->style & ES_MULTILINE)
		EDIT_ML_InvalidateText(es, start, end);
	else
		EDIT_SL_InvalidateText(es, start, end);
}


/*********************************************************************
 *
 *	EDIT_EM_SetSel
 *
 *	note:	unlike the specs say: the order of start and end
 *		_is_ preserved in Windows.  (i.e. start can be > end)
 *		In other words: this handler is OK
 *
 */
static BOOL EDIT_EM_SetSel(EDITSTATE *es, UINT start, UINT end, BOOL after_wrap)
{
	UINT old_start = es->selection_start;
	UINT old_end = es->selection_end;
	UINT len = get_text_length(es);

        if (start == old_start && end == old_end)
            return FALSE;

	if (start == (UINT)-1) {
		start = es->selection_end;
		end = es->selection_end;
	} else {
		start = min(start, len);
		end = min(end, len);
	}
	es->selection_start = start;
	es->selection_end = end;
	if (after_wrap)
		es->flags |= EF_AFTER_WRAP;
	else
		es->flags &= ~EF_AFTER_WRAP;
	/* Compute the necessary invalidation region. */
	/* Note that we don't need to invalidate regions which have
	 * "never" been selected, or those which are "still" selected.
	 * In fact, every time we hit a selection boundary, we can
	 * *toggle* whether we need to invalidate.  Thus we can optimize by
	 * *sorting* the interval endpoints.  Let's assume that we sort them
	 * in this order:
	 *        start <= end <= old_start <= old_end
	 * Knuth 5.3.1 (p 183) assures us that this can be done optimally
	 * in 5 comparisons; i.e. it is impossible to do better than the
	 * following: */
        ORDER_UINT(end, old_end);
        ORDER_UINT(start, old_start);
        ORDER_UINT(old_start, old_end);
        ORDER_UINT(start, end);
	/* Note that at this point 'end' and 'old_start' are not in order, but
	 * start is definitely the min. and old_end is definitely the max. */
	if (end != old_start)
        {
/*
 * One can also do
 *          ORDER_UINT32(end, old_start);
 *          EDIT_InvalidateText(es, start, end);
 *          EDIT_InvalidateText(es, old_start, old_end);
 * in place of the following if statement.
 * (That would complete the optimal five-comparison four-element sort.)
 */
            if (old_start > end )
            {
                EDIT_InvalidateText(es, start, end);
                EDIT_InvalidateText(es, old_start, old_end);
            }
            else
            {
                EDIT_InvalidateText(es, start, old_start);
                EDIT_InvalidateText(es, end, old_end);
            }
	}
        else EDIT_InvalidateText(es, start, old_end);

        return TRUE;
}


/*********************************************************************
 *
 *	EDIT_UpdateScrollInfo
 *
 */
static void EDIT_UpdateScrollInfo(EDITSTATE *es)
{
    if ((es->style & WS_VSCROLL) && !(es->flags & EF_VSCROLL_TRACK))
    {
	SCROLLINFO si;
	si.cbSize	= sizeof(SCROLLINFO);
	si.fMask	= SIF_PAGE | SIF_POS | SIF_RANGE | SIF_DISABLENOSCROLL;
	si.nMin		= 0;
	si.nMax		= es->line_count - 1;
	si.nPage	= es->line_height ? (es->format_rect.bottom - es->format_rect.top) / es->line_height : 0;
	si.nPos		= es->y_offset;
	TRACE("SB_VERT, nMin=%d, nMax=%d, nPage=%d, nPos=%d\n",
		si.nMin, si.nMax, si.nPage, si.nPos);
	SetScrollInfo(es->hwndSelf, SB_VERT, &si, TRUE);
    }

    if ((es->style & WS_HSCROLL) && !(es->flags & EF_HSCROLL_TRACK))
    {
	SCROLLINFO si;
	si.cbSize	= sizeof(SCROLLINFO);
	si.fMask	= SIF_PAGE | SIF_POS | SIF_RANGE | SIF_DISABLENOSCROLL;
	si.nMin		= 0;
	si.nMax		= es->text_width - 1;
	si.nPage	= es->format_rect.right - es->format_rect.left;
	si.nPos		= es->x_offset;
	TRACE("SB_HORZ, nMin=%d, nMax=%d, nPage=%d, nPos=%d\n",
		si.nMin, si.nMax, si.nPage, si.nPos);
	SetScrollInfo(es->hwndSelf, SB_HORZ, &si, TRUE);
    }
}


/*********************************************************************
 *
 *	EDIT_EM_LineScroll_internal
 *
 *	Version of EDIT_EM_LineScroll for internal use.
 *	It doesn't refuse if ES_MULTILINE is set and assumes that
 *	dx is in pixels, dy - in lines.
 *
 */
static BOOL EDIT_EM_LineScroll_internal(EDITSTATE *es, INT dx, INT dy)
{
	INT nyoff;
	INT x_offset_in_pixels;
	INT lines_per_page;

	if (!es->line_height || !es->char_width)
		return TRUE;

	lines_per_page = (es->format_rect.bottom - es->format_rect.top) / es->line_height;

	if (es->style & ES_MULTILINE)
	{
	    x_offset_in_pixels = es->x_offset;
	}
	else
	{
	    dy = 0;
	    x_offset_in_pixels = (short)LOWORD(EDIT_EM_PosFromChar(es, es->x_offset, FALSE));
	}

	if (-dx > x_offset_in_pixels)
		dx = -x_offset_in_pixels;
	if (dx > es->text_width - x_offset_in_pixels)
		dx = es->text_width - x_offset_in_pixels;
	nyoff = max(0, es->y_offset + dy);
	if (nyoff >= es->line_count - lines_per_page)
		nyoff = max(0, es->line_count - lines_per_page);
	dy = (es->y_offset - nyoff) * es->line_height;
	if (dx || dy) {
		RECT rc1;
		RECT rc;

		es->y_offset = nyoff;
		if(es->style & ES_MULTILINE)
		    es->x_offset += dx;
		else
		    es->x_offset += dx / es->char_width;

		GetClientRect(es->hwndSelf, &rc1);
		IntersectRect(&rc, &rc1, &es->format_rect);
		ScrollWindowEx(es->hwndSelf, -dx, dy,
				NULL, &rc, NULL, NULL, SW_INVALIDATE);
		/* force scroll info update */
		EDIT_UpdateScrollInfo(es);
	}
	if (dx && !(es->flags & EF_HSCROLL_TRACK))
		notify_parent(es, EN_HSCROLL);
	if (dy && !(es->flags & EF_VSCROLL_TRACK))
		notify_parent(es, EN_VSCROLL);
	return TRUE;
}

/*********************************************************************
 *
 *	EM_LINESCROLL
 *
 *	NOTE: dx is in average character widths, dy - in lines;
 *
 */
static BOOL EDIT_EM_LineScroll(EDITSTATE *es, INT dx, INT dy)
{
	if (!(es->style & ES_MULTILINE))
		return FALSE;

	dx *= es->char_width;
	return EDIT_EM_LineScroll_internal(es, dx, dy);
}


/*********************************************************************
 *
 *	EM_SCROLL
 *
 */
static LRESULT EDIT_EM_Scroll(EDITSTATE *es, INT action)
{
	INT dy;

	if (!(es->style & ES_MULTILINE))
		return (LRESULT)FALSE;

	dy = 0;

	switch (action) {
	case SB_LINEUP:
		if (es->y_offset)
			dy = -1;
		break;
	case SB_LINEDOWN:
		if (es->y_offset < es->line_count - 1)
			dy = 1;
		break;
	case SB_PAGEUP:
		if (es->y_offset)
			dy = -(es->format_rect.bottom - es->format_rect.top) / es->line_height;
		break;
	case SB_PAGEDOWN:
		if (es->y_offset < es->line_count - 1)
			dy = (es->format_rect.bottom - es->format_rect.top) / es->line_height;
		break;
	default:
		return (LRESULT)FALSE;
	}
	if (dy) {
	    INT vlc = get_vertical_line_count(es);
	    /* check if we are going to move too far */
	    if(es->y_offset + dy > es->line_count - vlc)
		dy = max(es->line_count - vlc, 0) - es->y_offset;

	    /* Notification is done in EDIT_EM_LineScroll */
	    if(dy) {
		EDIT_EM_LineScroll(es, 0, dy);
		return MAKELONG(dy, TRUE);
	    }

	}
	return (LRESULT)FALSE;
}


/*********************************************************************
 *
 *	EDIT_SetCaretPos
 *
 */
static void EDIT_SetCaretPos(EDITSTATE *es, INT pos,
			     BOOL after_wrap)
{
    LRESULT res;

    if (es->flags & EF_FOCUSED)
    {
        res = EDIT_EM_PosFromChar(es, pos, after_wrap);
        TRACE("%d - %dx%d\n", pos, (short)LOWORD(res), (short)HIWORD(res));
        SetCaretPos((short)LOWORD(res), (short)HIWORD(res));
    }
}


/*********************************************************************
 *
 *	EM_SCROLLCARET
 *
 */
static void EDIT_EM_ScrollCaret(EDITSTATE *es)
{
	if (es->style & ES_MULTILINE) {
		INT l;
		INT vlc;
		INT ww;
		INT cw = es->char_width;
		INT x;
		INT dy = 0;
		INT dx = 0;

		l = EDIT_EM_LineFromChar(es, es->selection_end);
		x = (short)LOWORD(EDIT_EM_PosFromChar(es, es->selection_end, es->flags & EF_AFTER_WRAP));
		vlc = get_vertical_line_count(es);
		if (l >= es->y_offset + vlc)
			dy = l - vlc + 1 - es->y_offset;
		if (l < es->y_offset)
			dy = l - es->y_offset;
		ww = es->format_rect.right - es->format_rect.left;
		if (x < es->format_rect.left)
			dx = x - es->format_rect.left - ww / HSCROLL_FRACTION / cw * cw;
		if (x > es->format_rect.right)
			dx = x - es->format_rect.left - (HSCROLL_FRACTION - 1) * ww / HSCROLL_FRACTION / cw * cw;
		if (dy || dx || (es->y_offset && (es->line_count - es->y_offset < vlc)))
		{
		    /* check if we are going to move too far */
		    if(es->x_offset + dx + ww > es->text_width)
			dx = es->text_width - ww - es->x_offset;
		    if(dx || dy || (es->y_offset && (es->line_count - es->y_offset < vlc)))
			EDIT_EM_LineScroll_internal(es, dx, dy);
		}
	} else {
		INT x;
		INT goal;
		INT format_width;

		x = (short)LOWORD(EDIT_EM_PosFromChar(es, es->selection_end, FALSE));
		format_width = es->format_rect.right - es->format_rect.left;
		if (x < es->format_rect.left) {
			goal = es->format_rect.left + format_width / HSCROLL_FRACTION;
			do {
				es->x_offset--;
				x = (short)LOWORD(EDIT_EM_PosFromChar(es, es->selection_end, FALSE));
			} while ((x < goal) && es->x_offset);
			/* FIXME: use ScrollWindow() somehow to improve performance */
			EDIT_UpdateText(es, NULL, TRUE);
		} else if (x > es->format_rect.right) {
			INT x_last;
			INT len = get_text_length(es);
			goal = es->format_rect.right - format_width / HSCROLL_FRACTION;
			do {
				es->x_offset++;
				x = (short)LOWORD(EDIT_EM_PosFromChar(es, es->selection_end, FALSE));
				x_last = (short)LOWORD(EDIT_EM_PosFromChar(es, len, FALSE));
			} while ((x > goal) && (x_last > es->format_rect.right));
			/* FIXME: use ScrollWindow() somehow to improve performance */
			EDIT_UpdateText(es, NULL, TRUE);
		}
	}

	EDIT_SetCaretPos(es, es->selection_end, es->flags & EF_AFTER_WRAP);
}


/*********************************************************************
 *
 *	EDIT_MoveBackward
 *
 */
static void EDIT_MoveBackward(EDITSTATE *es, BOOL extend)
{
	INT e = es->selection_end;

	if (e) {
		e--;
		if ((es->style & ES_MULTILINE) && e &&
				(es->text[e - 1] == '\r') && (es->text[e] == '\n')) {
			e--;
			if (e && (es->text[e - 1] == '\r'))
				e--;
		}
	}
	EDIT_EM_SetSel(es, extend ? es->selection_start : e, e, FALSE);
	EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *	EDIT_MoveDown_ML
 *
 *	Only for multi line controls
 *	Move the caret one line down, on a column with the nearest
 *	x coordinate on the screen (might be a different column).
 *
 */
static void EDIT_MoveDown_ML(EDITSTATE *es, BOOL extend)
{
	INT s = es->selection_start;
	INT e = es->selection_end;
	BOOL after_wrap = (es->flags & EF_AFTER_WRAP);
	LRESULT pos = EDIT_EM_PosFromChar(es, e, after_wrap);
	INT x = (short)LOWORD(pos);
	INT y = (short)HIWORD(pos);

	e = EDIT_CharFromPos(es, x, y + es->line_height, &after_wrap);
	if (!extend)
		s = e;
	EDIT_EM_SetSel(es, s, e, after_wrap);
	EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *	EDIT_MoveEnd
 *
 */
static void EDIT_MoveEnd(EDITSTATE *es, BOOL extend, BOOL ctrl)
{
	BOOL after_wrap = FALSE;
	INT e;

	/* Pass a high value in x to make sure of receiving the end of the line */
	if (!ctrl && (es->style & ES_MULTILINE))
		e = EDIT_CharFromPos(es, 0x3fffffff,
			HIWORD(EDIT_EM_PosFromChar(es, es->selection_end, es->flags & EF_AFTER_WRAP)), &after_wrap);
	else
		e = get_text_length(es);
	EDIT_EM_SetSel(es, extend ? es->selection_start : e, e, after_wrap);
	EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *	EDIT_MoveForward
 *
 */
static void EDIT_MoveForward(EDITSTATE *es, BOOL extend)
{
	INT e = es->selection_end;

	if (es->text[e]) {
		e++;
		if ((es->style & ES_MULTILINE) && (es->text[e - 1] == '\r')) {
			if (es->text[e] == '\n')
				e++;
			else if ((es->text[e] == '\r') && (es->text[e + 1] == '\n'))
				e += 2;
		}
	}
	EDIT_EM_SetSel(es, extend ? es->selection_start : e, e, FALSE);
	EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *	EDIT_MoveHome
 *
 *	Home key: move to beginning of line.
 *
 */
static void EDIT_MoveHome(EDITSTATE *es, BOOL extend, BOOL ctrl)
{
	INT e;

	/* Pass the x_offset in x to make sure of receiving the first position of the line */
	if (!ctrl && (es->style & ES_MULTILINE))
		e = EDIT_CharFromPos(es, -es->x_offset,
			HIWORD(EDIT_EM_PosFromChar(es, es->selection_end, es->flags & EF_AFTER_WRAP)), NULL);
	else
		e = 0;
	EDIT_EM_SetSel(es, extend ? es->selection_start : e, e, FALSE);
	EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *	EDIT_MovePageDown_ML
 *
 *	Only for multi line controls
 *	Move the caret one page down, on a column with the nearest
 *	x coordinate on the screen (might be a different column).
 *
 */
static void EDIT_MovePageDown_ML(EDITSTATE *es, BOOL extend)
{
	INT s = es->selection_start;
	INT e = es->selection_end;
	BOOL after_wrap = (es->flags & EF_AFTER_WRAP);
	LRESULT pos = EDIT_EM_PosFromChar(es, e, after_wrap);
	INT x = (short)LOWORD(pos);
	INT y = (short)HIWORD(pos);

	e = EDIT_CharFromPos(es, x,
		y + (es->format_rect.bottom - es->format_rect.top),
		&after_wrap);
	if (!extend)
		s = e;
	EDIT_EM_SetSel(es, s, e, after_wrap);
	EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *	EDIT_MovePageUp_ML
 *
 *	Only for multi line controls
 *	Move the caret one page up, on a column with the nearest
 *	x coordinate on the screen (might be a different column).
 *
 */
static void EDIT_MovePageUp_ML(EDITSTATE *es, BOOL extend)
{
	INT s = es->selection_start;
	INT e = es->selection_end;
	BOOL after_wrap = (es->flags & EF_AFTER_WRAP);
	LRESULT pos = EDIT_EM_PosFromChar(es, e, after_wrap);
	INT x = (short)LOWORD(pos);
	INT y = (short)HIWORD(pos);

	e = EDIT_CharFromPos(es, x,
		y - (es->format_rect.bottom - es->format_rect.top),
		&after_wrap);
	if (!extend)
		s = e;
	EDIT_EM_SetSel(es, s, e, after_wrap);
	EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *	EDIT_MoveUp_ML
 *
 *	Only for multi line controls
 *	Move the caret one line up, on a column with the nearest
 *	x coordinate on the screen (might be a different column).
 *
 */
static void EDIT_MoveUp_ML(EDITSTATE *es, BOOL extend)
{
	INT s = es->selection_start;
	INT e = es->selection_end;
	BOOL after_wrap = (es->flags & EF_AFTER_WRAP);
	LRESULT pos = EDIT_EM_PosFromChar(es, e, after_wrap);
	INT x = (short)LOWORD(pos);
	INT y = (short)HIWORD(pos);

	e = EDIT_CharFromPos(es, x, y - es->line_height, &after_wrap);
	if (!extend)
		s = e;
	EDIT_EM_SetSel(es, s, e, after_wrap);
	EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *	EDIT_MoveWordBackward
 *
 */
static void EDIT_MoveWordBackward(EDITSTATE *es, BOOL extend)
{
	INT s = es->selection_start;
	INT e = es->selection_end;
	INT l;
	INT ll;
	INT li;

	l = EDIT_EM_LineFromChar(es, e);
	ll = EDIT_EM_LineLength(es, e);
	li = EDIT_EM_LineIndex(es, l);
	if (e - li == 0) {
		if (l) {
			li = EDIT_EM_LineIndex(es, l - 1);
			e = li + EDIT_EM_LineLength(es, li);
		}
	} else {
		e = li + EDIT_CallWordBreakProc(es, li, e - li, ll, WB_LEFT);
	}
	if (!extend)
		s = e;
	EDIT_EM_SetSel(es, s, e, FALSE);
	EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *	EDIT_MoveWordForward
 *
 */
static void EDIT_MoveWordForward(EDITSTATE *es, BOOL extend)
{
	INT s = es->selection_start;
	INT e = es->selection_end;
	INT l;
	INT ll;
	INT li;

	l = EDIT_EM_LineFromChar(es, e);
	ll = EDIT_EM_LineLength(es, e);
	li = EDIT_EM_LineIndex(es, l);
	if (e - li == ll) {
		if ((es->style & ES_MULTILINE) && (l != es->line_count - 1))
			e = EDIT_EM_LineIndex(es, l + 1);
	} else {
		e = li + EDIT_CallWordBreakProc(es,
				li, e - li + 1, ll, WB_RIGHT);
	}
	if (!extend)
		s = e;
	EDIT_EM_SetSel(es, s, e, FALSE);
	EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *	EDIT_PaintText
 *
 */
static INT EDIT_PaintText(EDITSTATE *es, HDC dc, INT x, INT y, INT line, INT col, INT count, BOOL rev)
{
	COLORREF BkColor;
	COLORREF TextColor;
	LOGFONTW underline_font;
	HFONT hUnderline = 0;
	HFONT old_font = 0;
	INT ret;
	INT li;
	INT BkMode;
	SIZE size;

	if (!count)
		return 0;
	BkMode = GetBkMode(dc);
	BkColor = GetBkColor(dc);
	TextColor = GetTextColor(dc);
	if (rev) {
	        if (es->composition_len == 0)
	        {
			SetBkColor(dc, GetSysColor(COLOR_HIGHLIGHT));
			SetTextColor(dc, GetSysColor(COLOR_HIGHLIGHTTEXT));
			SetBkMode( dc, OPAQUE);
	        }
		else
		{
			HFONT current = GetCurrentObject(dc,OBJ_FONT);
			GetObjectW(current,sizeof(LOGFONTW),&underline_font);
			underline_font.lfUnderline = TRUE;
			hUnderline = CreateFontIndirectW(&underline_font);
			old_font = SelectObject(dc,hUnderline);
	        }
	}
	li = EDIT_EM_LineIndex(es, line);
	if (es->style & ES_MULTILINE) {
		ret = (INT)LOWORD(TabbedTextOutW(dc, x, y, es->text + li + col, count,
					es->tabs_count, es->tabs, es->format_rect.left - es->x_offset));
	} else {
		TextOutW(dc, x, y, es->text + li + col, count);
		GetTextExtentPoint32W(dc, es->text + li + col, count, &size);
		ret = size.cx;
	}
	if (rev) {
		if (es->composition_len == 0)
		{
			SetBkColor(dc, BkColor);
			SetTextColor(dc, TextColor);
			SetBkMode( dc, BkMode);
		}
		else
		{
			if (old_font)
				SelectObject(dc,old_font);
			if (hUnderline)
				DeleteObject(hUnderline);
	        }
	}
	return ret;
}


/*********************************************************************
 *
 *	EDIT_PaintLine
 *
 */
static void EDIT_PaintLine(EDITSTATE *es, HDC dc, INT line, BOOL rev)
{
	INT s = 0;
	INT e = 0;
	INT li = 0;
	INT ll = 0;
	INT x;
	INT y;
	LRESULT pos;
	SCRIPT_STRING_ANALYSIS ssa;

	if (es->style & ES_MULTILINE) {
		INT vlc = get_vertical_line_count(es);

		if ((line < es->y_offset) || (line > es->y_offset + vlc) || (line >= es->line_count))
			return;
	} else if (line)
		return;

	TRACE("line=%d\n", line);

	ssa = EDIT_UpdateUniscribeData(es, dc, line);
	pos = EDIT_EM_PosFromChar(es, EDIT_EM_LineIndex(es, line), FALSE);
	x = (short)LOWORD(pos);
	y = (short)HIWORD(pos);

	if (es->style & ES_MULTILINE)
	{
		int line_idx = line;
		x =  -es->x_offset;
		if (es->style & ES_RIGHT || es->style & ES_CENTER)
		{
			LINEDEF *line_def = es->first_line_def;
			int w, lw;

			while (line_def && line_idx)
			{
				line_def = line_def->next;
				line_idx--;
			}
			w = es->format_rect.right - es->format_rect.left;
			lw = line_def->width;

			if (es->style & ES_RIGHT)
				x = w - (lw - x);
			else if (es->style & ES_CENTER)
				x += (w - lw) / 2;
		}
		x += es->format_rect.left;
	}

	if (rev)
	{
		li = EDIT_EM_LineIndex(es, line);
		ll = EDIT_EM_LineLength(es, li);
		s = min(es->selection_start, es->selection_end);
		e = max(es->selection_start, es->selection_end);
		s = min(li + ll, max(li, s));
		e = min(li + ll, max(li, e));
	}

	if (ssa)
		ScriptStringOut(ssa, x, y, 0, &es->format_rect, s - li, e - li, FALSE);
	else if (rev && (s != e) &&
			((es->flags & EF_FOCUSED) || (es->style & ES_NOHIDESEL))) {
		x += EDIT_PaintText(es, dc, x, y, line, 0, s - li, FALSE);
		x += EDIT_PaintText(es, dc, x, y, line, s - li, e - s, TRUE);
		x += EDIT_PaintText(es, dc, x, y, line, e - li, li + ll - e, FALSE);
	} else
		x += EDIT_PaintText(es, dc, x, y, line, 0, ll, FALSE);

       if (es->cue_banner_text && es->text_length == 0 && (!(es->flags & EF_FOCUSED) || es->cue_banner_draw_focused))
       {
	       SetTextColor(dc, GetSysColor(COLOR_GRAYTEXT));
	       TextOutW(dc, x, y, es->cue_banner_text, lstrlenW(es->cue_banner_text));
       }
}


/*********************************************************************
 *
 *	EDIT_AdjustFormatRect
 *
 *	Adjusts the format rectangle for the current font and the
 *	current client rectangle.
 *
 */
static void EDIT_AdjustFormatRect(EDITSTATE *es)
{
	RECT ClientRect;

	es->format_rect.right = max(es->format_rect.right, es->format_rect.left + es->char_width);
	if (es->style & ES_MULTILINE)
	{
	    INT fw, vlc, max_x_offset, max_y_offset;

	    vlc = get_vertical_line_count(es);
	    es->format_rect.bottom = es->format_rect.top + vlc * es->line_height;

	    /* correct es->x_offset */
	    fw = es->format_rect.right - es->format_rect.left;
	    max_x_offset = es->text_width - fw;
	    if(max_x_offset < 0) max_x_offset = 0;
	    if(es->x_offset > max_x_offset)
		es->x_offset = max_x_offset;

	    /* correct es->y_offset */
	    max_y_offset = es->line_count - vlc;
	    if(max_y_offset < 0) max_y_offset = 0;
	    if(es->y_offset > max_y_offset)
		es->y_offset = max_y_offset;

	    /* force scroll info update */
	    EDIT_UpdateScrollInfo(es);
	}
	else
	/* Windows doesn't care to fix text placement for SL controls */
		es->format_rect.bottom = es->format_rect.top + es->line_height;

	/* Always stay within the client area */
	GetClientRect(es->hwndSelf, &ClientRect);
	es->format_rect.bottom = min(es->format_rect.bottom, ClientRect.bottom);

	if ((es->style & ES_MULTILINE) && !(es->style & ES_AUTOHSCROLL))
		EDIT_BuildLineDefs_ML(es, 0, get_text_length(es), 0, NULL);

	EDIT_SetCaretPos(es, es->selection_end, es->flags & EF_AFTER_WRAP);
}


/*********************************************************************
 *
 *	EDIT_SetRectNP
 *
 *	note:	this is not (exactly) the handler called on EM_SETRECTNP
 *		it is also used to set the rect of a single line control
 *
 */
static void EDIT_SetRectNP(EDITSTATE *es, const RECT *rc)
{
	LONG_PTR ExStyle;
	INT bw, bh;
	ExStyle = GetWindowLongPtrW(es->hwndSelf, GWL_EXSTYLE);

	CopyRect(&es->format_rect, rc);

	if (ExStyle & WS_EX_CLIENTEDGE) {
		es->format_rect.left++;
		es->format_rect.right--;

		if (es->format_rect.bottom - es->format_rect.top
		    >= es->line_height + 2)
		{
			es->format_rect.top++;
			es->format_rect.bottom--;
		}
	}
	else if (es->style & WS_BORDER) {
		bw = GetSystemMetrics(SM_CXBORDER) + 1;
		bh = GetSystemMetrics(SM_CYBORDER) + 1;
                InflateRect(&es->format_rect, -bw, 0);
                if (es->format_rect.bottom - es->format_rect.top >= es->line_height + 2 * bh)
                    InflateRect(&es->format_rect, 0, -bh);
	}

	es->format_rect.left += es->left_margin;
	es->format_rect.right -= es->right_margin;
	EDIT_AdjustFormatRect(es);
}


/*********************************************************************
 *
 *	EM_CHARFROMPOS
 *
 *      returns line number (not index) in high-order word of result.
 *      NB : Q137805 is unclear about this. POINT * pointer in lParam apply
 *      to Richedit, not to the edit control. Original documentation is valid.
 *	FIXME: do the specs mean to return -1 if outside client area or
 *		if outside formatting rectangle ???
 *
 */
static LRESULT EDIT_EM_CharFromPos(EDITSTATE *es, INT x, INT y)
{
	POINT pt;
	RECT rc;
	INT index;

	pt.x = x;
	pt.y = y;
	GetClientRect(es->hwndSelf, &rc);
	if (!PtInRect(&rc, pt))
		return -1;

	index = EDIT_CharFromPos(es, x, y, NULL);
	return MAKELONG(index, EDIT_EM_LineFromChar(es, index));
}


/*********************************************************************
 *
 *	EM_FMTLINES
 *
 * Enable or disable soft breaks.
 *
 * This means: insert or remove the soft linebreak character (\r\r\n).
 * Take care to check if the text still fits the buffer after insertion.
 * If not, notify with EN_ERRSPACE.
 *
 */
static BOOL EDIT_EM_FmtLines(EDITSTATE *es, BOOL add_eol)
{
	es->flags &= ~EF_USE_SOFTBRK;
	if (add_eol) {
		es->flags |= EF_USE_SOFTBRK;
		FIXME("soft break enabled, not implemented\n");
	}
	return add_eol;
}


/*********************************************************************
 *
 *	EM_GETHANDLE
 *
 *	Hopefully this won't fire back at us.
 *	We always start with a fixed buffer in the local heap.
 *	Despite of the documentation says that the local heap is used
 *	only if DS_LOCALEDIT flag is set, NT and 2000 always allocate
 *	buffer on the local heap.
 *
 */
static HLOCAL EDIT_EM_GetHandle(EDITSTATE *es)
{
    if (!(es->style & ES_MULTILINE))
        return 0;

    EDIT_UnlockBuffer(es, TRUE);

    /* The text buffer handle belongs to the app */
    es->hlocapp = es->hloc32W;

    TRACE("Returning %p, LocalSize() = %Id\n", es->hlocapp, LocalSize(es->hlocapp));
    return es->hlocapp;
}


/*********************************************************************
 *
 *	EM_GETLINE
 *
 */
static INT EDIT_EM_GetLine(EDITSTATE *es, INT line, LPWSTR dst)
{
    INT line_len, dst_len;
    LPWSTR src;
    INT i;

    if (es->style & ES_MULTILINE)
    {
        if (line >= es->line_count)
            return 0;
    }
    else
        line = 0;

    i = EDIT_EM_LineIndex(es, line);
    src = es->text + i;
    line_len = EDIT_EM_LineLength(es, i);
    dst_len = *(WORD *)dst;

    if (dst_len <= line_len)
    {
        memcpy(dst, src, dst_len * sizeof(WCHAR));
        return dst_len;
    }
    else /* Append 0 if enough space */
    {
        memcpy(dst, src, line_len * sizeof(WCHAR));
        dst[line_len] = 0;
        return line_len;
    }
}


/*********************************************************************
 *
 *	EM_GETSEL
 *
 */
static LRESULT EDIT_EM_GetSel(const EDITSTATE *es, PUINT start, PUINT end)
{
	UINT s = es->selection_start;
	UINT e = es->selection_end;

	ORDER_UINT(s, e);
	if (start)
		*start = s;
	if (end)
		*end = e;
	return MAKELONG(s, e);
}


/*********************************************************************
 *
 *	EM_REPLACESEL
 *
 *	FIXME: handle ES_NUMBER and ES_OEMCONVERT here
 *
 */
static void EDIT_EM_ReplaceSel(EDITSTATE *es, BOOL can_undo, const WCHAR *lpsz_replace, UINT strl,
                               BOOL send_update, BOOL honor_limit)
{
	UINT tl = get_text_length(es);
	UINT utl;
	UINT s;
	UINT e;
	UINT i;
	UINT size;
	LPWSTR p;
	HRGN hrgn = 0;
	LPWSTR buf = NULL;
	UINT bufl;

	TRACE("%s, can_undo %d, send_update %d\n",
	    debugstr_wn(lpsz_replace, strl), can_undo, send_update);

	s = es->selection_start;
	e = es->selection_end;

	EDIT_InvalidateUniscribeData(es);
	if ((s == e) && !strl)
		return;

	ORDER_UINT(s, e);

	size = tl - (e - s) + strl;
	if (!size)
		es->text_width = 0;

	/* Issue the EN_MAXTEXT notification and continue with replacing text
         * so that buffer limit is honored. */
	if ((honor_limit) && (size > es->buffer_limit))
	{
		if (!notify_parent(es, EN_MAXTEXT)) return;
		/* Buffer limit can be smaller than the actual length of text in combobox */
		if (es->buffer_limit < (tl - (e-s)))
			strl = 0;
		else
			strl = min(strl, es->buffer_limit - (tl - (e-s)));
	}

	if (!EDIT_MakeFit(es, tl - (e - s) + strl))
		return;

	if (e != s) {
		/* there is something to be deleted */
		TRACE("deleting stuff.\n");
		bufl = e - s;
		buf = Alloc((bufl + 1) * sizeof(WCHAR));
		if (!buf) return;
		memcpy(buf, es->text + s, bufl * sizeof(WCHAR));
		buf[bufl] = 0; /* ensure 0 termination */
		/* now delete */
		lstrcpyW(es->text + s, es->text + e);
                text_buffer_changed(es);
	}
	if (strl) {
		/* there is an insertion */
		tl = get_text_length(es);
		TRACE("inserting stuff (tl %d, strl %d, selstart %d (%s), text %s)\n", tl, strl, s, debugstr_w(es->text + s), debugstr_w(es->text));
		for (p = es->text + tl ; p >= es->text + s ; p--)
			p[strl] = p[0];
		for (i = 0 , p = es->text + s ; i < strl ; i++)
			p[i] = lpsz_replace[i];
		if(es->style & ES_UPPERCASE)
			CharUpperBuffW(p, strl);
		else if(es->style & ES_LOWERCASE)
			CharLowerBuffW(p, strl);
                text_buffer_changed(es);
	}
	if (es->style & ES_MULTILINE)
	{
		INT st = min(es->selection_start, es->selection_end);
		INT vlc = get_vertical_line_count(es);

		hrgn = CreateRectRgn(0, 0, 0, 0);
		EDIT_BuildLineDefs_ML(es, st, st + strl,
				strl - abs(es->selection_end - es->selection_start), hrgn);
		/* if text is too long undo all changes */
		if (honor_limit && !(es->style & ES_AUTOVSCROLL) && (es->line_count > vlc)) {
			if (strl)
				lstrcpyW(es->text + e, es->text + e + strl);
			if (e != s)
				for (i = 0 , p = es->text ; i < e - s ; i++)
					p[i + s] = buf[i];
                        text_buffer_changed(es);
			EDIT_BuildLineDefs_ML(es, s, e,
				abs(es->selection_end - es->selection_start) - strl, hrgn);
			strl = 0;
			e = s;
                        SetRectRgn(hrgn, 0, 0, 0, 0);
			if (!notify_parent(es, EN_MAXTEXT)) return;
		}
	}
	else {
		INT fw = es->format_rect.right - es->format_rect.left;
		EDIT_InvalidateUniscribeData(es);
		EDIT_CalcLineWidth_SL(es);
		/* remove chars that don't fit */
		if (honor_limit && !(es->style & ES_AUTOHSCROLL) && (es->text_width > fw)) {
			while ((es->text_width > fw) && s + strl >= s) {
				lstrcpyW(es->text + s + strl - 1, es->text + s + strl);
				strl--;
				es->text_length = -1;
				EDIT_InvalidateUniscribeData(es);
				EDIT_CalcLineWidth_SL(es);
			}
                        text_buffer_changed(es);
			if (!notify_parent(es, EN_MAXTEXT)) return;
		}
	}

	if (e != s) {
		if (can_undo) {
			utl = lstrlenW(es->undo_text);
			if (!es->undo_insert_count && (*es->undo_text && (s == es->undo_position))) {
				/* undo-buffer is extended to the right */
				EDIT_MakeUndoFit(es, utl + e - s);
				memcpy(es->undo_text + utl, buf, (e - s)*sizeof(WCHAR));
				(es->undo_text + utl)[e - s] = 0; /* ensure 0 termination */
			} else if (!es->undo_insert_count && (*es->undo_text && (e == es->undo_position))) {
				/* undo-buffer is extended to the left */
				EDIT_MakeUndoFit(es, utl + e - s);
				for (p = es->undo_text + utl ; p >= es->undo_text ; p--)
					p[e - s] = p[0];
				for (i = 0 , p = es->undo_text ; i < e - s ; i++)
					p[i] = buf[i];
				es->undo_position = s;
			} else {
				/* new undo-buffer */
				EDIT_MakeUndoFit(es, e - s);
				memcpy(es->undo_text, buf, (e - s)*sizeof(WCHAR));
				es->undo_text[e - s] = 0; /* ensure 0 termination */
				es->undo_position = s;
			}
			/* any deletion makes the old insertion-undo invalid */
			es->undo_insert_count = 0;
		} else
			EDIT_EM_EmptyUndoBuffer(es);
	}
	if (strl) {
		if (can_undo) {
			if ((s == es->undo_position) ||
				((es->undo_insert_count) &&
				(s == es->undo_position + es->undo_insert_count)))
				/*
				 * insertion is new and at delete position or
				 * an extension to either left or right
				 */
				es->undo_insert_count += strl;
			else {
				/* new insertion undo */
				es->undo_position = s;
				es->undo_insert_count = strl;
				/* new insertion makes old delete-buffer invalid */
				*es->undo_text = '\0';
			}
		} else
			EDIT_EM_EmptyUndoBuffer(es);
	}

	Free(buf);

	s += strl;

	/* If text has been deleted and we're right or center aligned then scroll rightward */
	if (es->style & (ES_RIGHT | ES_CENTER))
	{
		INT delta = strl - abs(es->selection_end - es->selection_start);

		if (delta < 0 && es->x_offset)
		{
			if (abs(delta) > es->x_offset)
				es->x_offset = 0;
			else
				es->x_offset += delta;
		}
	}

	EDIT_EM_SetSel(es, s, s, FALSE);
	es->flags |= EF_MODIFIED;
	if (send_update) es->flags |= EF_UPDATE;
	if (hrgn)
	{
		EDIT_UpdateTextRegion(es, hrgn, TRUE);
		DeleteObject(hrgn);
	}
	else
            EDIT_UpdateText(es, NULL, TRUE);

	EDIT_EM_ScrollCaret(es);

	/* force scroll info update */
	EDIT_UpdateScrollInfo(es);


        if(send_update || (es->flags & EF_UPDATE))
	{
	    es->flags &= ~EF_UPDATE;
	    if (!notify_parent(es, EN_CHANGE)) return;
	}
	EDIT_InvalidateUniscribeData(es);
}


/*********************************************************************
 *
 *	EM_SETHANDLE
 *
 *	FIXME:	ES_LOWERCASE, ES_UPPERCASE, ES_OEMCONVERT, ES_NUMBER ???
 *
 */
static void EDIT_EM_SetHandle(EDITSTATE *es, HLOCAL hloc)
{
    if (!(es->style & ES_MULTILINE))
        return;

    if (!hloc)
        return;

    EDIT_UnlockBuffer(es, TRUE);

    es->hloc32W = hloc;
    es->buffer_size = LocalSize(es->hloc32W)/sizeof(WCHAR) - 1;

    /* The text buffer handle belongs to the control */
    es->hlocapp = NULL;

    EDIT_LockBuffer(es);
    text_buffer_changed(es);

    es->x_offset = es->y_offset = 0;
    es->selection_start = es->selection_end = 0;
    EDIT_EM_EmptyUndoBuffer(es);
    es->flags &= ~EF_MODIFIED;
    es->flags &= ~EF_UPDATE;
    EDIT_BuildLineDefs_ML(es, 0, get_text_length(es), 0, NULL);
    EDIT_UpdateText(es, NULL, TRUE);
    EDIT_EM_ScrollCaret(es);
    /* force scroll info update */
    EDIT_UpdateScrollInfo(es);
}


/*********************************************************************
 *
 *	EM_SETLIMITTEXT
 *
 *	NOTE: this version currently implements WinNT limits
 *
 */
static void EDIT_EM_SetLimitText(EDITSTATE *es, UINT limit)
{
    if (!limit) limit = ~0u;
    if (!(es->style & ES_MULTILINE)) limit = min(limit, 0x7ffffffe);
    es->buffer_limit = limit;
}

static BOOL is_cjk(HDC dc)
{
    const DWORD FS_DBCS_MASK = FS_JISJAPAN|FS_CHINESESIMP|FS_WANSUNG|FS_CHINESETRAD|FS_JOHAB;
    FONTSIGNATURE fs;

    switch (GdiGetCodePage(dc)) {
    case 932: case 936: case 949: case 950: case 1361:
        return TRUE;
    default:
        return (GetTextCharsetInfo(dc, &fs, 0) != DEFAULT_CHARSET &&
                (fs.fsCsb[0] & FS_DBCS_MASK));
    }
}

static int get_cjk_fontinfo_margin(int width, int side_bearing)
{
    int margin;
    if (side_bearing < 0)
        margin = min(-side_bearing, width/2);
    else
        margin = 0;
    return margin;
}

struct char_width_info {
    INT min_lsb, min_rsb, unknown;
};

/* Undocumented gdi32 export */
extern BOOL WINAPI GetCharWidthInfo(HDC, struct char_width_info *);

/*********************************************************************
 *
 *	EM_SETMARGINS
 *
 * EC_USEFONTINFO is used as a left or right value i.e. lParam and not as an
 * action wParam despite what the docs say. EC_USEFONTINFO calculates the
 * margin according to the textmetrics of the current font.
 *
 * When EC_USEFONTINFO is used, the margins only change if the edit control is
 * equal to or larger than a certain size. The empty client rect is treated as
 * 80 pixels width.
 */
static void EDIT_EM_SetMargins(EDITSTATE *es, INT action,
			       WORD left, WORD right, BOOL repaint)
{
	TEXTMETRICW tm;
	INT default_left_margin  = 0; /* in pixels */
	INT default_right_margin = 0; /* in pixels */

        /* Set the default margins depending on the font */
        if (es->font && (left == EC_USEFONTINFO || right == EC_USEFONTINFO)) {
            HDC dc = GetDC(es->hwndSelf);
            HFONT old_font = SelectObject(dc, es->font);
            LONG width = GdiGetCharDimensions(dc, &tm, NULL), rc_width;
            RECT rc;

            /* The default margins are only non zero for TrueType or Vector fonts */
            if (tm.tmPitchAndFamily & ( TMPF_VECTOR | TMPF_TRUETYPE )) {
                struct char_width_info width_info;

                if (is_cjk(dc) && GetCharWidthInfo(dc, &width_info))
                {
                    default_left_margin = get_cjk_fontinfo_margin(width, width_info.min_lsb);
                    default_right_margin = get_cjk_fontinfo_margin(width, width_info.min_rsb);
                }
                else
                {
                    default_left_margin = width / 2;
                    default_right_margin = width / 2;
                }

                GetClientRect(es->hwndSelf, &rc);
                rc_width = !IsRectEmpty(&rc) ? rc.right - rc.left : 80;
                if (rc_width < default_left_margin + default_right_margin + width * 2) {
                    default_left_margin = es->left_margin;
                    default_right_margin = es->right_margin;
                }
            }
            SelectObject(dc, old_font);
            ReleaseDC(es->hwndSelf, dc);
        }

	if (action & EC_LEFTMARGIN) {
		es->format_rect.left -= es->left_margin;
		if (left != EC_USEFONTINFO)
			es->left_margin = left;
		else
			es->left_margin = default_left_margin;
		es->format_rect.left += es->left_margin;
	}

	if (action & EC_RIGHTMARGIN) {
		es->format_rect.right += es->right_margin;
		if (right != EC_USEFONTINFO)
			es->right_margin = right;
		else
			es->right_margin = default_right_margin;
		es->format_rect.right -= es->right_margin;
	}

	if (action & (EC_LEFTMARGIN | EC_RIGHTMARGIN)) {
		EDIT_AdjustFormatRect(es);
		if (repaint) EDIT_UpdateText(es, NULL, TRUE);
	}

	TRACE("left=%d, right=%d\n", es->left_margin, es->right_margin);
}


/*********************************************************************
 *
 *	EM_SETPASSWORDCHAR
 *
 */
static void EDIT_EM_SetPasswordChar(EDITSTATE *es, WCHAR c)
{
	LONG style;

	if (es->style & ES_MULTILINE)
		return;

	if (es->password_char == c)
		return;

        style = GetWindowLongW( es->hwndSelf, GWL_STYLE );
	es->password_char = c;
	if (c) {
            SetWindowLongW( es->hwndSelf, GWL_STYLE, style | ES_PASSWORD );
            es->style |= ES_PASSWORD;
	} else {
            SetWindowLongW( es->hwndSelf, GWL_STYLE, style & ~ES_PASSWORD );
            es->style &= ~ES_PASSWORD;
	}
	EDIT_InvalidateUniscribeData(es);
	EDIT_UpdateText(es, NULL, TRUE);
}


/*********************************************************************
 *
 *	EM_SETTABSTOPS
 *
 */
static BOOL EDIT_EM_SetTabStops(EDITSTATE *es, INT count, const INT *tabs)
{
	if (!(es->style & ES_MULTILINE))
		return FALSE;
	Free(es->tabs);
	es->tabs_count = count;
	if (!count)
		es->tabs = NULL;
	else {
		es->tabs = Alloc(count * sizeof(INT));
		memcpy(es->tabs, tabs, count * sizeof(INT));
	}
	EDIT_InvalidateUniscribeData(es);
	return TRUE;
}


/*********************************************************************
 *
 *	EM_SETWORDBREAKPROC
 *
 */
static void EDIT_EM_SetWordBreakProc(EDITSTATE *es, EDITWORDBREAKPROCW wbp)
{
	if (es->word_break_proc == wbp)
		return;

	es->word_break_proc = wbp;

	if ((es->style & ES_MULTILINE) && !(es->style & ES_AUTOHSCROLL)) {
		EDIT_BuildLineDefs_ML(es, 0, get_text_length(es), 0, NULL);
		EDIT_UpdateText(es, NULL, TRUE);
	}
}


/*********************************************************************
 *
 *	EM_UNDO / WM_UNDO
 *
 */
static BOOL EDIT_EM_Undo(EDITSTATE *es)
{
	INT ulength;
	LPWSTR utext;

	/* As per MSDN spec, for a single-line edit control,
	   the return value is always TRUE */
	if( es->style & ES_READONLY )
            return !(es->style & ES_MULTILINE);

	ulength = lstrlenW(es->undo_text);

	utext = Alloc((ulength + 1) * sizeof(WCHAR));

	lstrcpyW(utext, es->undo_text);

	TRACE("before UNDO:insertion length = %d, deletion buffer = %s\n",
		     es->undo_insert_count, debugstr_w(utext));

	EDIT_EM_SetSel(es, es->undo_position, es->undo_position + es->undo_insert_count, FALSE);
	EDIT_EM_EmptyUndoBuffer(es);
	EDIT_EM_ReplaceSel(es, TRUE, utext, ulength, TRUE, TRUE);
	EDIT_EM_SetSel(es, es->undo_position, es->undo_position + es->undo_insert_count, FALSE);
        /* send the notification after the selection start and end are set */
        if (!notify_parent(es, EN_CHANGE)) return TRUE;
	EDIT_EM_ScrollCaret(es);
	Free(utext);

	TRACE("after UNDO:insertion length = %d, deletion buffer = %s\n",
			es->undo_insert_count, debugstr_w(es->undo_text));
	return TRUE;
}


/* Helper function for WM_CHAR
 *
 * According to an MSDN blog article titled "Just because you're a control
 * doesn't mean that you're necessarily inside a dialog box," multiline edit
 * controls without ES_WANTRETURN would attempt to detect whether it is inside
 * a dialog box or not.
 */
static inline BOOL EDIT_IsInsideDialog(EDITSTATE *es)
{
    return (es->flags & EF_DIALOGMODE);
}


/*********************************************************************
 *
 *	WM_PASTE
 *
 */
static void EDIT_WM_Paste(EDITSTATE *es)
{
	HGLOBAL hsrc;
	LPWSTR src, ptr;
	int len;

	/* Protect read-only edit control from modification */
	if(es->style & ES_READONLY)
	    return;

	OpenClipboard(es->hwndSelf);
	if ((hsrc = GetClipboardData(CF_UNICODETEXT))) {
		src = GlobalLock(hsrc);
                len = lstrlenW(src);
		/* Protect single-line edit against pasting new line character */
		if (!(es->style & ES_MULTILINE) && ((ptr = wcschr(src, '\n')))) {
			len = ptr - src;
			if (len && src[len - 1] == '\r')
				--len;
		}
                EDIT_EM_ReplaceSel(es, TRUE, src, len, TRUE, TRUE);
		GlobalUnlock(hsrc);
	}
        else if (es->style & ES_PASSWORD) {
            /* clear selected text in password edit box even with empty clipboard */
            EDIT_EM_ReplaceSel(es, TRUE, NULL, 0, TRUE, TRUE);
        }
	CloseClipboard();
}


/*********************************************************************
 *
 *	WM_COPY
 *
 */
static void EDIT_WM_Copy(EDITSTATE *es)
{
	INT s = min(es->selection_start, es->selection_end);
	INT e = max(es->selection_start, es->selection_end);
	HGLOBAL hdst;
	LPWSTR dst;
	DWORD len;

	if (e == s) return;

	len = e - s;
	hdst = GlobalAlloc(GMEM_MOVEABLE | GMEM_DDESHARE, (len + 1) * sizeof(WCHAR));
	dst = GlobalLock(hdst);
	memcpy(dst, es->text + s, len * sizeof(WCHAR));
	dst[len] = 0; /* ensure 0 termination */
	TRACE("%s\n", debugstr_w(dst));
	GlobalUnlock(hdst);
	OpenClipboard(es->hwndSelf);
	EmptyClipboard();
	SetClipboardData(CF_UNICODETEXT, hdst);
	CloseClipboard();
}


/*********************************************************************
 *
 *	WM_CLEAR
 *
 */
static inline void EDIT_WM_Clear(EDITSTATE *es)
{
	/* Protect read-only edit control from modification */
	if(es->style & ES_READONLY)
	    return;

	EDIT_EM_ReplaceSel(es, TRUE, NULL, 0, TRUE, TRUE);
}


/*********************************************************************
 *
 *	WM_CUT
 *
 */
static inline void EDIT_WM_Cut(EDITSTATE *es)
{
	EDIT_WM_Copy(es);
	EDIT_WM_Clear(es);
}


/*********************************************************************
 *
 *	WM_CHAR
 *
 */
static LRESULT EDIT_WM_Char(EDITSTATE *es, WCHAR c)
{
        BOOL control;

	control = GetKeyState(VK_CONTROL) & 0x8000;

	switch (c) {
	case '\r':
            /* If it's not a multiline edit box, it would be ignored below.
             * For multiline edit without ES_WANTRETURN, we have to make a
             * special case.
             */
            if ((es->style & ES_MULTILINE) && !(es->style & ES_WANTRETURN))
                if (EDIT_IsInsideDialog(es))
                    break;
	case '\n':
		if (es->style & ES_MULTILINE) {
			if (es->style & ES_READONLY) {
				EDIT_MoveHome(es, FALSE, FALSE);
				EDIT_MoveDown_ML(es, FALSE);
			} else
				EDIT_EM_ReplaceSel(es, TRUE, L"\r\n", 2, TRUE, TRUE);
		}
		break;
	case '\t':
		if ((es->style & ES_MULTILINE) && !(es->style & ES_READONLY))
		{
                        if (EDIT_IsInsideDialog(es))
                            break;
			EDIT_EM_ReplaceSel(es, TRUE, L"\t", 1, TRUE, TRUE);
		}
		break;
	case VK_BACK:
		if (!(es->style & ES_READONLY) && !control) {
			if (es->selection_start != es->selection_end)
				EDIT_WM_Clear(es);
			else {
				/* delete character left of caret */
				EDIT_EM_SetSel(es, (UINT)-1, 0, FALSE);
				EDIT_MoveBackward(es, TRUE);
				EDIT_WM_Clear(es);
			}
		}
		break;
	case 0x03: /* ^C */
		if (!(es->style & ES_PASSWORD))
		    SendMessageW(es->hwndSelf, WM_COPY, 0, 0);
		break;
	case 0x16: /* ^V */
	        if (!(es->style & ES_READONLY))
		    SendMessageW(es->hwndSelf, WM_PASTE, 0, 0);
		break;
	case 0x18: /* ^X */
	        if (!((es->style & ES_READONLY) || (es->style & ES_PASSWORD)))
		    SendMessageW(es->hwndSelf, WM_CUT, 0, 0);
		break;
	case 0x1A: /* ^Z */
	        if (!(es->style & ES_READONLY))
		    SendMessageW(es->hwndSelf, WM_UNDO, 0, 0);
		break;

	default:
		/*If Edit control style is ES_NUMBER allow users to key in only numeric values*/
		if( (es->style & ES_NUMBER) && !( c >= '0' && c <= '9') )
			break;

		if (!(es->style & ES_READONLY) && (c >= ' ') && (c != 127))
			EDIT_EM_ReplaceSel(es, TRUE, &c, 1, TRUE, TRUE);
		break;
	}
    return 1;
}


/*********************************************************************
 *
 *	EDIT_ContextMenuCommand
 *
 */
static void EDIT_ContextMenuCommand(EDITSTATE *es, UINT id)
{
	switch (id) {
		case EM_UNDO:
                        SendMessageW(es->hwndSelf, WM_UNDO, 0, 0);
			break;
		case WM_CUT:
                        SendMessageW(es->hwndSelf, WM_CUT, 0, 0);
			break;
		case WM_COPY:
                        SendMessageW(es->hwndSelf, WM_COPY, 0, 0);
			break;
		case WM_PASTE:
                        SendMessageW(es->hwndSelf, WM_PASTE, 0, 0);
			break;
		case WM_CLEAR:
                        SendMessageW(es->hwndSelf, WM_CLEAR, 0, 0);
			break;
		case EM_SETSEL:
                        SendMessageW(es->hwndSelf, EM_SETSEL, 0, -1);
			break;
		default:
			ERR("unknown menu item, please report\n");
			break;
	}
}


/*********************************************************************
 *
 *	WM_CONTEXTMENU
 *
 *	Note: the resource files resource/sysres_??.rc cannot define a
 *		single popup menu.  Hence we use a (dummy) menubar
 *		containing the single popup menu as its first item.
 *
 *	FIXME: the message identifiers have been chosen arbitrarily,
 *		hence we use MF_BYPOSITION.
 *		We might as well use the "real" values (anybody knows ?)
 *		The menu definition is in resources/sysres_??.rc.
 *		Once these are OK, we better use MF_BYCOMMAND here
 *		(as we do in EDIT_WM_Command()).
 *
 */
static void EDIT_WM_ContextMenu(EDITSTATE *es, INT x, INT y)
{
    HMENU menu = LoadMenuA(GetModuleHandleA("user32.dll"), "EDITMENU");
    HMENU popup = GetSubMenu(menu, 0);
    UINT start = es->selection_start;
    UINT end = es->selection_end;
    UINT cmd;
    POINT pt;

    ORDER_UINT(start, end);

    /* undo */
    EnableMenuItem(popup, 0, MF_BYPOSITION | (EDIT_EM_CanUndo(es) && !(es->style & ES_READONLY) ? MF_ENABLED : MF_GRAYED));
    /* cut */
    EnableMenuItem(popup, 2, MF_BYPOSITION | ((end - start) && !(es->style & ES_PASSWORD) && !(es->style & ES_READONLY) ? MF_ENABLED : MF_GRAYED));
    /* copy */
    EnableMenuItem(popup, 3, MF_BYPOSITION | ((end - start) && !(es->style & ES_PASSWORD) ? MF_ENABLED : MF_GRAYED));
    /* paste */
    EnableMenuItem(popup, 4, MF_BYPOSITION | (IsClipboardFormatAvailable(CF_UNICODETEXT) && !(es->style & ES_READONLY) ? MF_ENABLED : MF_GRAYED));
    /* delete */
    EnableMenuItem(popup, 5, MF_BYPOSITION | ((end - start) && !(es->style & ES_READONLY) ? MF_ENABLED : MF_GRAYED));
    /* select all */
    EnableMenuItem(popup, 7, MF_BYPOSITION | (start || (end != get_text_length(es)) ? MF_ENABLED : MF_GRAYED));

    pt.x = x;
    pt.y = y;

    if (pt.x == -1 && pt.y == -1) /* passed via VK_APPS press/release */
    {
        RECT rc;

        /* Windows places the menu at the edit's center in this case */
        GetClientRect(es->hwndSelf, &rc);
        pt.x = rc.left + (rc.right - rc.left) / 2;
        pt.y = rc.top + (rc.bottom - rc.top) / 2;
        ClientToScreen(es->hwndSelf, &pt);
    }

    if (!(es->flags & EF_FOCUSED))
        SetFocus(es->hwndSelf);

    cmd = TrackPopupMenu(popup, TPM_LEFTALIGN | TPM_RIGHTBUTTON | TPM_RETURNCMD | TPM_NONOTIFY,
            pt.x, pt.y, 0, es->hwndSelf, NULL);

    if (cmd)
        EDIT_ContextMenuCommand(es, cmd);

    DestroyMenu(menu);
}


/*********************************************************************
 *
 *	WM_GETTEXT
 *
 */
static INT EDIT_WM_GetText(const EDITSTATE *es, INT count, LPWSTR dst)
{
    if (!count)
        return 0;

    lstrcpynW(dst, es->text, count);
    return lstrlenW(dst);
}

/*********************************************************************
 *
 *	EDIT_CheckCombo
 *
 */
static BOOL EDIT_CheckCombo(EDITSTATE *es, UINT msg, INT key)
{
    HWND hLBox = es->hwndListBox;
    HWND hCombo;
    BOOL bDropped;
    int  nEUI;

    if (!hLBox)
        return FALSE;

    hCombo   = GetParent(es->hwndSelf);
    bDropped = TRUE;
    nEUI     = 0;

    TRACE("[%p]: handling msg %x (%x)\n", es->hwndSelf, msg, key);

    if (key == VK_UP || key == VK_DOWN)
    {
        if (SendMessageW(hCombo, CB_GETEXTENDEDUI, 0, 0))
            nEUI = 1;

        if (msg == WM_KEYDOWN || nEUI)
            bDropped = (BOOL)SendMessageW(hCombo, CB_GETDROPPEDSTATE, 0, 0);
    }

    switch (msg)
    {
    case WM_KEYDOWN:
        if (!bDropped && nEUI && (key == VK_UP || key == VK_DOWN))
        {
            /* make sure ComboLBox pops up */
            SendMessageW(hCombo, CB_SETEXTENDEDUI, FALSE, 0);
            key = VK_F4;
            nEUI = 2;
        }

        SendMessageW(hLBox, WM_KEYDOWN, key, 0);
        break;

    case WM_SYSKEYDOWN: /* Handle Alt+up/down arrows */
        if (nEUI)
           SendMessageW(hCombo, CB_SHOWDROPDOWN, !bDropped, 0);
        else
           SendMessageW(hLBox, WM_KEYDOWN, VK_F4, 0);
        break;
    }

    if (nEUI == 2)
        SendMessageW(hCombo, CB_SETEXTENDEDUI, TRUE, 0);

    return TRUE;
}


/*********************************************************************
 *
 *	WM_KEYDOWN
 *
 *	Handling of special keys that don't produce a WM_CHAR
 *	(i.e. non-printable keys) & Backspace & Delete
 *
 */
static LRESULT EDIT_WM_KeyDown(EDITSTATE *es, INT key)
{
	BOOL shift;
	BOOL control;

	if (GetKeyState(VK_MENU) & 0x8000)
		return 0;

	shift = GetKeyState(VK_SHIFT) & 0x8000;
	control = GetKeyState(VK_CONTROL) & 0x8000;

	switch (key) {
	case VK_F4:
	case VK_UP:
		if (EDIT_CheckCombo(es, WM_KEYDOWN, key) || key == VK_F4)
			break;

		/* fall through */
	case VK_LEFT:
		if ((es->style & ES_MULTILINE) && (key == VK_UP))
			EDIT_MoveUp_ML(es, shift);
		else
			if (control)
				EDIT_MoveWordBackward(es, shift);
			else
				EDIT_MoveBackward(es, shift);
		break;
	case VK_DOWN:
		if (EDIT_CheckCombo(es, WM_KEYDOWN, key))
			break;
		/* fall through */
	case VK_RIGHT:
		if ((es->style & ES_MULTILINE) && (key == VK_DOWN))
			EDIT_MoveDown_ML(es, shift);
		else if (control)
			EDIT_MoveWordForward(es, shift);
		else
			EDIT_MoveForward(es, shift);
		break;
	case VK_HOME:
		EDIT_MoveHome(es, shift, control);
		break;
	case VK_END:
		EDIT_MoveEnd(es, shift, control);
		break;
	case VK_PRIOR:
		if (es->style & ES_MULTILINE)
			EDIT_MovePageUp_ML(es, shift);
		else
			EDIT_CheckCombo(es, WM_KEYDOWN, key);
		break;
	case VK_NEXT:
		if (es->style & ES_MULTILINE)
			EDIT_MovePageDown_ML(es, shift);
		else
			EDIT_CheckCombo(es, WM_KEYDOWN, key);
		break;
	case VK_DELETE:
		if (!(es->style & ES_READONLY) && !(shift && control)) {
			if (es->selection_start != es->selection_end) {
				if (shift)
					EDIT_WM_Cut(es);
				else
					EDIT_WM_Clear(es);
			} else {
				EDIT_EM_SetSel(es, ~0u, 0, FALSE);
				if (shift)
					/* delete character left of caret */
					EDIT_MoveBackward(es, TRUE);
				else if (control)
					/* delete to end of line */
					EDIT_MoveEnd(es, TRUE, FALSE);
				else
					/* delete character right of caret */
					EDIT_MoveForward(es, TRUE);
				EDIT_WM_Clear(es);
			}
		}
		break;
	case VK_INSERT:
		if (shift) {
			if (!(es->style & ES_READONLY))
				EDIT_WM_Paste(es);
		} else if (control)
			EDIT_WM_Copy(es);
		break;
	case VK_RETURN:
	    /* If the edit doesn't want the return send a message to the default object */
	    if(!(es->style & ES_MULTILINE) || !(es->style & ES_WANTRETURN))
	    {
                DWORD dw;

                if (!EDIT_IsInsideDialog(es)) break;
                if (control) break;
                dw = SendMessageW(es->hwndParent, DM_GETDEFID, 0, 0);
                if (HIWORD(dw) == DC_HASDEFID)
                {
                    HWND hwDefCtrl = GetDlgItem(es->hwndParent, LOWORD(dw));
                    if (hwDefCtrl)
                    {
                        SendMessageW(es->hwndParent, WM_NEXTDLGCTL, (WPARAM)hwDefCtrl, TRUE);
                        PostMessageW(hwDefCtrl, WM_KEYDOWN, VK_RETURN, 0);
                    }
                }
	    }
	    break;
        case VK_ESCAPE:
            if ((es->style & ES_MULTILINE) && EDIT_IsInsideDialog(es))
                PostMessageW(es->hwndParent, WM_CLOSE, 0, 0);
            break;
        case VK_TAB:
            if ((es->style & ES_MULTILINE) && EDIT_IsInsideDialog(es))
                SendMessageW(es->hwndParent, WM_NEXTDLGCTL, shift, 0);
            break;
        case 'A':
            if (control)
            {
                if (EDIT_EM_SetSel(es, 0, get_text_length(es), FALSE))
                {
                    if (!notify_parent(es, EN_UPDATE)) break;
                    notify_parent(es, EN_CHANGE);
                }
            }
            break;
	}
        return TRUE;
}


/*********************************************************************
 *
 *	WM_KILLFOCUS
 *
 */
static LRESULT EDIT_WM_KillFocus(HTHEME theme, EDITSTATE *es)
{
    UINT flags = RDW_INVALIDATE;

    es->flags &= ~EF_FOCUSED;
    DestroyCaret();
    if (!(es->style & ES_NOHIDESEL))
        EDIT_InvalidateText(es, es->selection_start, es->selection_end);
    if (!notify_parent(es, EN_KILLFOCUS)) return 0;
    /* Throw away left over scroll when we lose focus */
    es->wheelDeltaRemainder = 0;

    if (theme)
        flags |= RDW_FRAME;

    RedrawWindow(es->hwndSelf, NULL, NULL, flags);
    return 0;
}


/*********************************************************************
 *
 *	WM_LBUTTONDBLCLK
 *
 *	The caret position has been set on the WM_LBUTTONDOWN message
 *
 */
static LRESULT EDIT_WM_LButtonDblClk(EDITSTATE *es)
{
	INT s;
	INT e = es->selection_end;
	INT l;
	INT li;
	INT ll;

	es->bCaptureState = TRUE;
	SetCapture(es->hwndSelf);

	l = EDIT_EM_LineFromChar(es, e);
	li = EDIT_EM_LineIndex(es, l);
	ll = EDIT_EM_LineLength(es, e);
	s = li + EDIT_CallWordBreakProc(es, li, e - li, ll, WB_LEFT);
	e = li + EDIT_CallWordBreakProc(es, li, e - li, ll, WB_RIGHT);
	EDIT_EM_SetSel(es, s, e, FALSE);
	EDIT_EM_ScrollCaret(es);
	es->region_posx = es->region_posy = 0;
	SetTimer(es->hwndSelf, 0, 100, NULL);
	return 0;
}


/*********************************************************************
 *
 *	WM_LBUTTONDOWN
 *
 */
static LRESULT EDIT_WM_LButtonDown(EDITSTATE *es, DWORD keys, INT x, INT y)
{
	INT e;
	BOOL after_wrap;

	es->bCaptureState = TRUE;
	SetCapture(es->hwndSelf);
	EDIT_ConfinePoint(es, &x, &y);
	e = EDIT_CharFromPos(es, x, y, &after_wrap);
	EDIT_EM_SetSel(es, (keys & MK_SHIFT) ? es->selection_start : e, e, after_wrap);
	EDIT_EM_ScrollCaret(es);
	es->region_posx = es->region_posy = 0;
	SetTimer(es->hwndSelf, 0, 100, NULL);

	if (!(es->flags & EF_FOCUSED))
            SetFocus(es->hwndSelf);

	return 0;
}


/*********************************************************************
 *
 *	WM_LBUTTONUP
 *
 */
static LRESULT EDIT_WM_LButtonUp(EDITSTATE *es)
{
	if (es->bCaptureState) {
		KillTimer(es->hwndSelf, 0);
		if (GetCapture() == es->hwndSelf) ReleaseCapture();
	}
	es->bCaptureState = FALSE;
	return 0;
}


/*********************************************************************
 *
 *	WM_MBUTTONDOWN
 *
 */
static LRESULT EDIT_WM_MButtonDown(EDITSTATE *es)
{
    SendMessageW(es->hwndSelf, WM_PASTE, 0, 0);
    return 0;
}


/*********************************************************************
 *
 *	WM_MOUSEMOVE
 *
 */
static LRESULT EDIT_WM_MouseMove(EDITSTATE *es, INT x, INT y)
{
	INT e;
	BOOL after_wrap;
	INT prex, prey;

        /* If the mouse has been captured by process other than the edit control itself,
         * the windows edit controls will not select the strings with mouse move.
         */
        if (!es->bCaptureState || GetCapture() != es->hwndSelf)
		return 0;

	/*
	 *	FIXME: gotta do some scrolling if outside client
	 *		area.  Maybe reset the timer ?
	 */
	prex = x; prey = y;
	EDIT_ConfinePoint(es, &x, &y);
	es->region_posx = (prex < x) ? -1 : ((prex > x) ? 1 : 0);
	es->region_posy = (prey < y) ? -1 : ((prey > y) ? 1 : 0);
	e = EDIT_CharFromPos(es, x, y, &after_wrap);
	EDIT_EM_SetSel(es, es->selection_start, e, after_wrap);
	EDIT_SetCaretPos(es,es->selection_end,es->flags & EF_AFTER_WRAP);
	return 0;
}


/*********************************************************************
 *
 *	WM_PAINT
 *
 */
static void EDIT_WM_Paint(EDITSTATE *es, HDC hdc)
{
	PAINTSTRUCT ps;
	INT i;
	HDC dc;
	HFONT old_font = 0;
	RECT rc;
	RECT rcClient;
	RECT rcLine;
	RECT rcRgn;
	HBRUSH brush;
	HBRUSH old_brush;
	INT bw, bh;
	BOOL rev = es->bEnableState &&
				((es->flags & EF_FOCUSED) ||
					(es->style & ES_NOHIDESEL));
        dc = hdc ? hdc : BeginPaint(es->hwndSelf, &ps);

	/* The dc we use for calculating may not be the one we paint into.
	   This is the safest action. */
	EDIT_InvalidateUniscribeData(es);
	GetClientRect(es->hwndSelf, &rcClient);

	/* get the background brush */
	brush = EDIT_NotifyCtlColor(es, dc);

	/* paint the border and the background */
	IntersectClipRect(dc, rcClient.left, rcClient.top, rcClient.right, rcClient.bottom);

	if(es->style & WS_BORDER) {
		bw = GetSystemMetrics(SM_CXBORDER);
		bh = GetSystemMetrics(SM_CYBORDER);
		rc = rcClient;
		if(es->style & ES_MULTILINE) {
			if(es->style & WS_HSCROLL) rc.bottom+=bh;
			if(es->style & WS_VSCROLL) rc.right+=bw;
		}

		/* Draw the frame. Same code as in nonclient.c */
		old_brush = SelectObject(dc, GetSysColorBrush(COLOR_WINDOWFRAME));
		PatBlt(dc, rc.left, rc.top, rc.right - rc.left, bh, PATCOPY);
		PatBlt(dc, rc.left, rc.top, bw, rc.bottom - rc.top, PATCOPY);
		PatBlt(dc, rc.left, rc.bottom - 1, rc.right - rc.left, -bw, PATCOPY);
		PatBlt(dc, rc.right - 1, rc.top, -bw, rc.bottom - rc.top, PATCOPY);
		SelectObject(dc, old_brush);

		/* Keep the border clean */
		IntersectClipRect(dc, rc.left+bw, rc.top+bh,
		    max(rc.right-bw, rc.left+bw), max(rc.bottom-bh, rc.top+bh));
	}

	GetClipBox(dc, &rc);
	FillRect(dc, &rc, brush);

	IntersectClipRect(dc, es->format_rect.left,
				es->format_rect.top,
				es->format_rect.right,
				es->format_rect.bottom);
	if (es->style & ES_MULTILINE) {
		rc = rcClient;
		IntersectClipRect(dc, rc.left, rc.top, rc.right, rc.bottom);
	}
	if (es->font)
		old_font = SelectObject(dc, es->font);

	if (!es->bEnableState)
		SetTextColor(dc, GetSysColor(COLOR_GRAYTEXT));
	GetClipBox(dc, &rcRgn);
	if (es->style & ES_MULTILINE) {
		INT vlc = get_vertical_line_count(es);
		for (i = es->y_offset ; i <= min(es->y_offset + vlc, es->y_offset + es->line_count - 1) ; i++) {
			EDIT_UpdateUniscribeData(es, dc, i);
			EDIT_GetLineRect(es, i, 0, -1, &rcLine);
			if (IntersectRect(&rc, &rcRgn, &rcLine))
				EDIT_PaintLine(es, dc, i, rev);
		}
	} else {
		EDIT_UpdateUniscribeData(es, dc, 0);
		EDIT_GetLineRect(es, 0, 0, -1, &rcLine);
		if (IntersectRect(&rc, &rcRgn, &rcLine))
			EDIT_PaintLine(es, dc, 0, rev);
	}
	if (es->font)
		SelectObject(dc, old_font);

        if (!hdc)
            EndPaint(es->hwndSelf, &ps);
}

static void EDIT_WM_NCPaint(HWND hwnd, HRGN region)
{
    DWORD exStyle = GetWindowLongW(hwnd, GWL_EXSTYLE);
    HTHEME theme = GetWindowTheme(hwnd);
    HRGN cliprgn = region;

    if (theme && exStyle & WS_EX_CLIENTEDGE)
    {
        HDC dc;
        RECT r;
        int cxEdge = GetSystemMetrics(SM_CXEDGE),
            cyEdge = GetSystemMetrics(SM_CYEDGE);
        const int part = EP_EDITTEXT;
        int state = ETS_NORMAL;
        DWORD dwStyle = GetWindowLongW(hwnd, GWL_STYLE);

        if (!IsWindowEnabled(hwnd))
            state = ETS_DISABLED;
        else if (dwStyle & ES_READONLY)
            state = ETS_READONLY;
        else if (GetFocus() == hwnd)
            state = ETS_FOCUSED;

        GetWindowRect(hwnd, &r);

        /* New clipping region passed to default proc to exclude border */
        cliprgn = CreateRectRgn(r.left + cxEdge, r.top + cyEdge,
            r.right - cxEdge, r.bottom - cyEdge);
        if (region != (HRGN)1)
            CombineRgn(cliprgn, cliprgn, region, RGN_AND);
        OffsetRect(&r, -r.left, -r.top);

        dc = GetDCEx(hwnd, region, DCX_WINDOW|DCX_INTERSECTRGN);

        if (IsThemeBackgroundPartiallyTransparent(theme, part, state))
            DrawThemeParentBackground(hwnd, dc, &r);
        DrawThemeBackground(theme, dc, part, state, &r, 0);
        ReleaseDC(hwnd, dc);
    }

    /* Call default proc to get the scrollbars etc. also painted */
    DefWindowProcW (hwnd, WM_NCPAINT, (WPARAM)cliprgn, 0);
    if (cliprgn != region)
        DeleteObject(cliprgn);
}

/*********************************************************************
 *
 *	WM_SETFOCUS
 *
 */
static void EDIT_WM_SetFocus(HTHEME theme, EDITSTATE *es)
{
    UINT flags = RDW_INVALIDATE;

    es->flags |= EF_FOCUSED;

    if (!(es->style & ES_NOHIDESEL))
        EDIT_InvalidateText(es, es->selection_start, es->selection_end);

    CreateCaret(es->hwndSelf, 0, 1, es->line_height);
    EDIT_SetCaretPos(es, es->selection_end, es->flags & EF_AFTER_WRAP);
    ShowCaret(es->hwndSelf);
    if (!notify_parent(es, EN_SETFOCUS)) return;

    if (theme)
        flags |= RDW_FRAME | RDW_ERASE;

    RedrawWindow(es->hwndSelf, NULL, NULL, flags);
}


static DWORD get_font_margins(HDC hdc, const TEXTMETRICW *tm)
{
	ABC abc[256];
	SHORT left, right;
	UINT i;

	if (!(tm->tmPitchAndFamily & (TMPF_VECTOR | TMPF_TRUETYPE)))
		return MAKELONG(EC_USEFONTINFO, EC_USEFONTINFO);

	if (!is_cjk(hdc))
		return MAKELONG(EC_USEFONTINFO, EC_USEFONTINFO);

	if (!GetCharABCWidthsW(hdc, 0, 255, abc))
		return 0;

	left = right = 0;
	for (i = 0; i < ARRAY_SIZE(abc); i++) {
		if (-abc[i].abcA > right) right = -abc[i].abcA;
		if (-abc[i].abcC > left ) left  = -abc[i].abcC;
	}
	return MAKELONG(left, right);
}

/*********************************************************************
 *
 *	WM_SETFONT
 *
 * With Win95 look the margins are set to default font value unless
 * the system font (font == 0) is being set, in which case they are left
 * unchanged.
 *
 */
static void EDIT_WM_SetFont(EDITSTATE *es, HFONT font, BOOL redraw)
{
	TEXTMETRICW tm;
	HDC dc;
	HFONT old_font = 0;
	RECT clientRect;
	DWORD margins;

	es->font = font;
	EDIT_InvalidateUniscribeData(es);
	dc = GetDC(es->hwndSelf);
	if (font)
		old_font = SelectObject(dc, font);
	GetTextMetricsW(dc, &tm);
	es->line_height = tm.tmHeight;
	es->char_width = tm.tmAveCharWidth;
	margins = get_font_margins(dc, &tm);
	if (font)
		SelectObject(dc, old_font);
	ReleaseDC(es->hwndSelf, dc);

	/* Reset the format rect and the margins */
	GetClientRect(es->hwndSelf, &clientRect);
	EDIT_SetRectNP(es, &clientRect);
	if (margins)
		EDIT_EM_SetMargins(es, EC_LEFTMARGIN | EC_RIGHTMARGIN,
				   LOWORD(margins), HIWORD(margins), FALSE);

	if (es->style & ES_MULTILINE)
		EDIT_BuildLineDefs_ML(es, 0, get_text_length(es), 0, NULL);
	else
	    EDIT_CalcLineWidth_SL(es);

	if (redraw)
		EDIT_UpdateText(es, NULL, TRUE);
	if (es->flags & EF_FOCUSED) {
		DestroyCaret();
		CreateCaret(es->hwndSelf, 0, 1, es->line_height);
		EDIT_SetCaretPos(es, es->selection_end,
				 es->flags & EF_AFTER_WRAP);
		ShowCaret(es->hwndSelf);
	}
}


/*********************************************************************
 *
 *	WM_SETTEXT
 *
 * NOTES
 *  For multiline controls (ES_MULTILINE), reception of WM_SETTEXT triggers:
 *  The modified flag is reset. No notifications are sent.
 *
 *  For single-line controls, reception of WM_SETTEXT triggers:
 *  The modified flag is reset. EN_UPDATE and EN_CHANGE notifications are sent.
 *
 */
static void EDIT_WM_SetText(EDITSTATE *es, LPCWSTR text)
{
    if (es->flags & EF_UPDATE)
        /* fixed this bug once; complain if we see it about to happen again. */
        ERR("SetSel may generate UPDATE message whose handler may reset "
            "selection.\n");

    EDIT_EM_SetSel(es, 0, (UINT)-1, FALSE);
    if (text)
    {
	TRACE("%s\n", debugstr_w(text));
	EDIT_EM_ReplaceSel(es, FALSE, text, lstrlenW(text), FALSE, FALSE);
    }
    else
    {
	TRACE("<NULL>\n");
	EDIT_EM_ReplaceSel(es, FALSE, NULL, 0, FALSE, FALSE);
    }
    es->x_offset = 0;
    es->flags &= ~EF_MODIFIED;
    EDIT_EM_SetSel(es, 0, 0, FALSE);

    /* Send the notification after the selection start and end have been set
     * edit control doesn't send notification on WM_SETTEXT
     * if it is multiline, or it is part of combobox
     */
    if( !((es->style & ES_MULTILINE) || es->hwndListBox))
    {
        if (!notify_parent(es, EN_UPDATE)) return;
        if (!notify_parent(es, EN_CHANGE)) return;
    }
    EDIT_EM_ScrollCaret(es);
    EDIT_UpdateScrollInfo(es);
    EDIT_InvalidateUniscribeData(es);
}


/*********************************************************************
 *
 *	WM_SIZE
 *
 */
static void EDIT_WM_Size(EDITSTATE *es, UINT action)
{
	if ((action == SIZE_MAXIMIZED) || (action == SIZE_RESTORED)) {
		RECT rc;
		GetClientRect(es->hwndSelf, &rc);
		EDIT_SetRectNP(es, &rc);
		EDIT_UpdateText(es, NULL, TRUE);
	}
}


/*********************************************************************
 *
 *	WM_STYLECHANGED
 *
 * This message is sent by SetWindowLong on having changed either the Style
 * or the extended style.
 *
 * We ensure that the window's version of the styles and the EDITSTATE's agree.
 *
 * See also EDIT_WM_NCCreate
 *
 * It appears that the Windows version of the edit control allows the style
 * (as retrieved by GetWindowLong) to be any value and maintains an internal
 * style variable which will generally be different.  In this function we
 * update the internal style based on what changed in the externally visible
 * style.
 *
 * Much of this content as based upon the MSDN, especially:
 *  Platform SDK Documentation -> User Interface Services ->
 *      Windows User Interface -> Edit Controls -> Edit Control Reference ->
 *      Edit Control Styles
 */
static LRESULT  EDIT_WM_StyleChanged ( EDITSTATE *es, WPARAM which, const STYLESTRUCT *style)
{
        if (GWL_STYLE == which) {
                DWORD style_change_mask;
                DWORD new_style;
                /* Only a subset of changes can be applied after the control
                 * has been created.
                 */
                style_change_mask = ES_UPPERCASE | ES_LOWERCASE |
                                    ES_NUMBER;
                if (es->style & ES_MULTILINE)
                        style_change_mask |= ES_WANTRETURN;

                new_style = style->styleNew & style_change_mask;

                /* Number overrides lowercase overrides uppercase (at least it
                 * does in Win95).  However I'll bet that ES_NUMBER would be
                 * invalid under Win 3.1.
                 */
                if (new_style & ES_NUMBER) {
                        ; /* do not override the ES_NUMBER */
                }  else if (new_style & ES_LOWERCASE) {
                        new_style &= ~ES_UPPERCASE;
                }

                es->style = (es->style & ~style_change_mask) | new_style;
        } else if (GWL_EXSTYLE == which) {
                ; /* FIXME - what is needed here */
        } else {
                WARN ("Invalid style change %#Ix.\n", which);
        }

        return 0;
}

/*********************************************************************
 *
 *	WM_SYSKEYDOWN
 *
 */
static LRESULT EDIT_WM_SysKeyDown(EDITSTATE *es, INT key, DWORD key_data)
{
	if ((key == VK_BACK) && (key_data & 0x2000)) {
		if (EDIT_EM_CanUndo(es))
			EDIT_EM_Undo(es);
		return 0;
	} else if (key == VK_UP || key == VK_DOWN) {
		if (EDIT_CheckCombo(es, WM_SYSKEYDOWN, key))
			return 0;
	}
	return DefWindowProcW(es->hwndSelf, WM_SYSKEYDOWN, key, key_data);
}


/*********************************************************************
 *
 *	WM_TIMER
 *
 */
static void EDIT_WM_Timer(EDITSTATE *es)
{
	if (es->region_posx < 0) {
		EDIT_MoveBackward(es, TRUE);
	} else if (es->region_posx > 0) {
		EDIT_MoveForward(es, TRUE);
	}
/*
 *	FIXME: gotta do some vertical scrolling here, like
 *		EDIT_EM_LineScroll(hwnd, 0, 1);
 */
}

/*********************************************************************
 *
 *	WM_HSCROLL
 *
 */
static LRESULT EDIT_WM_HScroll(EDITSTATE *es, INT action, INT pos)
{
	INT dx;
	INT fw;

	if (!(es->style & ES_MULTILINE))
		return 0;

	if (!(es->style & ES_AUTOHSCROLL))
		return 0;

	dx = 0;
	fw = es->format_rect.right - es->format_rect.left;
	switch (action) {
	case SB_LINELEFT:
		TRACE("SB_LINELEFT\n");
		if (es->x_offset)
			dx = -es->char_width;
		break;
	case SB_LINERIGHT:
		TRACE("SB_LINERIGHT\n");
		if (es->x_offset < es->text_width)
			dx = es->char_width;
		break;
	case SB_PAGELEFT:
		TRACE("SB_PAGELEFT\n");
		if (es->x_offset)
			dx = -fw / HSCROLL_FRACTION / es->char_width * es->char_width;
		break;
	case SB_PAGERIGHT:
		TRACE("SB_PAGERIGHT\n");
		if (es->x_offset < es->text_width)
			dx = fw / HSCROLL_FRACTION / es->char_width * es->char_width;
		break;
	case SB_LEFT:
		TRACE("SB_LEFT\n");
		if (es->x_offset)
			dx = -es->x_offset;
		break;
	case SB_RIGHT:
		TRACE("SB_RIGHT\n");
		if (es->x_offset < es->text_width)
			dx = es->text_width - es->x_offset;
		break;
	case SB_THUMBTRACK:
		TRACE("SB_THUMBTRACK %d\n", pos);
		es->flags |= EF_HSCROLL_TRACK;
		if(es->style & WS_HSCROLL)
		    dx = pos - es->x_offset;
		else
		{
		    INT fw, new_x;
		    /* Sanity check */
		    if(pos < 0 || pos > 100) return 0;
		    /* Assume default scroll range 0-100 */
		    fw = es->format_rect.right - es->format_rect.left;
		    new_x = pos * (es->text_width - fw) / 100;
		    dx = es->text_width ? (new_x - es->x_offset) : 0;
		}
		break;
	case SB_THUMBPOSITION:
		TRACE("SB_THUMBPOSITION %d\n", pos);
		es->flags &= ~EF_HSCROLL_TRACK;
		if(GetWindowLongW( es->hwndSelf, GWL_STYLE ) & WS_HSCROLL)
		    dx = pos - es->x_offset;
		else
		{
		    INT fw, new_x;
		    /* Sanity check */
		    if(pos < 0 || pos > 100) return 0;
		    /* Assume default scroll range 0-100 */
		    fw = es->format_rect.right - es->format_rect.left;
		    new_x = pos * (es->text_width - fw) / 100;
		    dx = es->text_width ? (new_x - es->x_offset) : 0;
		}
		if (!dx) {
			/* force scroll info update */
			EDIT_UpdateScrollInfo(es);
			notify_parent(es, EN_HSCROLL);
		}
		break;
	case SB_ENDSCROLL:
		TRACE("SB_ENDSCROLL\n");
		break;
	/*
	 *	FIXME : the next two are undocumented !
	 *	Are we doing the right thing ?
	 *	At least Win 3.1 Notepad makes use of EM_GETTHUMB this way,
	 *	although it's also a regular control message.
	 */
	case EM_GETTHUMB: /* this one is used by NT notepad */
	{
		LRESULT ret;
		if(GetWindowLongW( es->hwndSelf, GWL_STYLE ) & WS_HSCROLL)
		    ret = GetScrollPos(es->hwndSelf, SB_HORZ);
		else
		{
		    /* Assume default scroll range 0-100 */
		    INT fw = es->format_rect.right - es->format_rect.left;
		    ret = es->text_width ? es->x_offset * 100 / (es->text_width - fw) : 0;
		}
		TRACE("EM_GETTHUMB: returning %Id\n", ret);
		return ret;
	}
	case EM_LINESCROLL:
		TRACE("EM_LINESCROLL16\n");
		dx = pos;
		break;

	default:
		ERR("undocumented WM_HSCROLL action %d (0x%04x), please report\n",
                    action, action);
		return 0;
	}
	if (dx)
	{
	    INT fw = es->format_rect.right - es->format_rect.left;
	    /* check if we are going to move too far */
	    if(es->x_offset + dx + fw > es->text_width)
		dx = es->text_width - fw - es->x_offset;
	    if(dx)
		EDIT_EM_LineScroll_internal(es, dx, 0);
	}
	return 0;
}


/*********************************************************************
 *
 *	WM_VSCROLL
 *
 */
static LRESULT EDIT_WM_VScroll(EDITSTATE *es, INT action, INT pos)
{
	INT dy;

	if (!(es->style & ES_MULTILINE))
		return 0;

	if (!(es->style & ES_AUTOVSCROLL))
		return 0;

	dy = 0;
	switch (action) {
	case SB_LINEUP:
	case SB_LINEDOWN:
	case SB_PAGEUP:
	case SB_PAGEDOWN:
		TRACE("action %d (%s)\n", action, (action == SB_LINEUP ? "SB_LINEUP" :
						   (action == SB_LINEDOWN ? "SB_LINEDOWN" :
						    (action == SB_PAGEUP ? "SB_PAGEUP" :
						     "SB_PAGEDOWN"))));
		EDIT_EM_Scroll(es, action);
		return 0;
	case SB_TOP:
		TRACE("SB_TOP\n");
		dy = -es->y_offset;
		break;
	case SB_BOTTOM:
		TRACE("SB_BOTTOM\n");
		dy = es->line_count - 1 - es->y_offset;
		break;
	case SB_THUMBTRACK:
		TRACE("SB_THUMBTRACK %d\n", pos);
		es->flags |= EF_VSCROLL_TRACK;
		if(es->style & WS_VSCROLL)
		    dy = pos - es->y_offset;
		else
		{
		    /* Assume default scroll range 0-100 */
		    INT vlc, new_y;
		    /* Sanity check */
		    if(pos < 0 || pos > 100) return 0;
		    vlc = get_vertical_line_count(es);
		    new_y = pos * (es->line_count - vlc) / 100;
		    dy = es->line_count ? (new_y - es->y_offset) : 0;
		    TRACE("line_count=%d, y_offset=%d, pos=%d, dy = %d\n",
			    es->line_count, es->y_offset, pos, dy);
		}
		break;
	case SB_THUMBPOSITION:
		TRACE("SB_THUMBPOSITION %d\n", pos);
		es->flags &= ~EF_VSCROLL_TRACK;
		if(es->style & WS_VSCROLL)
		    dy = pos - es->y_offset;
		else
		{
		    /* Assume default scroll range 0-100 */
		    INT vlc, new_y;
		    /* Sanity check */
		    if(pos < 0 || pos > 100) return 0;
		    vlc = get_vertical_line_count(es);
		    new_y = pos * (es->line_count - vlc) / 100;
		    dy = es->line_count ? (new_y - es->y_offset) : 0;
		    TRACE("line_count=%d, y_offset=%d, pos=%d, dy = %d\n",
			    es->line_count, es->y_offset, pos, dy);
		}
		if (!dy)
		{
			/* force scroll info update */
			EDIT_UpdateScrollInfo(es);
			notify_parent(es, EN_VSCROLL);
		}
		break;
	case SB_ENDSCROLL:
		TRACE("SB_ENDSCROLL\n");
		break;
	/*
	 *	FIXME : the next two are undocumented !
	 *	Are we doing the right thing ?
	 *	At least Win 3.1 Notepad makes use of EM_GETTHUMB this way,
	 *	although it's also a regular control message.
	 */
	case EM_GETTHUMB: /* this one is used by NT notepad */
	{
		LRESULT ret;
		if(GetWindowLongW( es->hwndSelf, GWL_STYLE ) & WS_VSCROLL)
		    ret = GetScrollPos(es->hwndSelf, SB_VERT);
		else
		{
		    /* Assume default scroll range 0-100 */
		    INT vlc = get_vertical_line_count(es);
		    ret = es->line_count ? es->y_offset * 100 / (es->line_count - vlc) : 0;
		}
		TRACE("EM_GETTHUMB: returning %Id\n", ret);
		return ret;
	}
	case EM_LINESCROLL:
		TRACE("EM_LINESCROLL %d\n", pos);
		dy = pos;
		break;

	default:
		ERR("undocumented WM_VSCROLL action %d (0x%04x), please report\n",
                    action, action);
		return 0;
	}
	if (dy)
		EDIT_EM_LineScroll(es, 0, dy);
	return 0;
}

/*********************************************************************
 *
 *	EM_GETTHUMB
 *
 *	FIXME: is this right ?  (or should it be only VSCROLL)
 *	(and maybe only for edit controls that really have their
 *	own scrollbars) (and maybe only for multiline controls ?)
 *	All in all: very poorly documented
 *
 */
static LRESULT EDIT_EM_GetThumb(EDITSTATE *es)
{
	return MAKELONG(EDIT_WM_VScroll(es, EM_GETTHUMB, 0),
                        EDIT_WM_HScroll(es, EM_GETTHUMB, 0));
}

/*********************************************************************
 *
 *	EM_SETCUEBANNER
 *
 */
static BOOL EDIT_EM_SetCueBanner(EDITSTATE *es, BOOL draw_focused, const WCHAR *cue_text)
{
    if (es->style & ES_MULTILINE || !cue_text)
        return FALSE;

    Free(es->cue_banner_text);
    es->cue_banner_text = wcsdup(cue_text);
    es->cue_banner_draw_focused = draw_focused;

    return TRUE;
}

/*********************************************************************
 *
 *	EM_GETCUEBANNER
 *
 */
static BOOL EDIT_EM_GetCueBanner(EDITSTATE *es, WCHAR *buf, DWORD size)
{
    if (es->style & ES_MULTILINE)
        return FALSE;

    if (!es->cue_banner_text)
    {
        if (buf && size)
            *buf = 0;
        return FALSE;
    }
    else
    {
        if (buf)
            lstrcpynW(buf, es->cue_banner_text, size);
        return TRUE;
    }
}


/********************************************************************
 *
 * The Following code is to handle inline editing from IMEs
 */

static void EDIT_GetCompositionStr(HIMC hIMC, LPARAM CompFlag, EDITSTATE *es)
{
    LONG buflen;
    LPWSTR lpCompStr;
    LPSTR lpCompStrAttr = NULL;
    DWORD dwBufLenAttr;

    buflen = ImmGetCompositionStringW(hIMC, GCS_COMPSTR, NULL, 0);

    if (buflen < 0)
    {
        return;
    }

    lpCompStr = Alloc(buflen);
    if (!lpCompStr)
    {
        ERR("Unable to allocate IME CompositionString\n");
        return;
    }

    if (buflen)
        ImmGetCompositionStringW(hIMC, GCS_COMPSTR, lpCompStr, buflen);

    if (CompFlag & GCS_COMPATTR)
    {
        /*
         * We do not use the attributes yet. it would tell us what characters
         * are in transition and which are converted or decided upon
         */
        dwBufLenAttr = ImmGetCompositionStringW(hIMC, GCS_COMPATTR, NULL, 0);
        if (dwBufLenAttr)
        {
            dwBufLenAttr ++;
            lpCompStrAttr = Alloc(dwBufLenAttr + 1);
            if (!lpCompStrAttr)
            {
                ERR("Unable to allocate IME Attribute String\n");
                Free(lpCompStr);
                return;
            }
            ImmGetCompositionStringW(hIMC,GCS_COMPATTR, lpCompStrAttr,
                    dwBufLenAttr);
            lpCompStrAttr[dwBufLenAttr] = 0;
        }
    }

    /* check for change in composition start */
    if (es->selection_end < es->composition_start)
        es->composition_start = es->selection_end;

    /* replace existing selection string */
    es->selection_start = es->composition_start;

    if (es->composition_len > 0)
        es->selection_end = es->composition_start + es->composition_len;
    else
        es->selection_end = es->selection_start;

    EDIT_EM_ReplaceSel(es, FALSE, lpCompStr, buflen / sizeof(WCHAR), TRUE, TRUE);
    es->composition_len = abs(es->composition_start - es->selection_end);

    es->selection_start = es->composition_start;
    es->selection_end = es->selection_start + es->composition_len;

    Free(lpCompStrAttr);
    Free(lpCompStr);
}

static void EDIT_GetResultStr(HIMC hIMC, EDITSTATE *es)
{
    LONG buflen;
    LPWSTR lpResultStr;

    buflen = ImmGetCompositionStringW(hIMC, GCS_RESULTSTR, NULL, 0);
    if (buflen <= 0)
    {
        return;
    }

    lpResultStr = Alloc(buflen);
    if (!lpResultStr)
    {
        ERR("Unable to alloc buffer for IME string\n");
        return;
    }

    ImmGetCompositionStringW(hIMC, GCS_RESULTSTR, lpResultStr, buflen);

    /* check for change in composition start */
    if (es->selection_end < es->composition_start)
        es->composition_start = es->selection_end;

    es->selection_start = es->composition_start;
    es->selection_end = es->composition_start + es->composition_len;
    EDIT_EM_ReplaceSel(es, TRUE, lpResultStr, buflen / sizeof(WCHAR), TRUE, TRUE);
    es->composition_start = es->selection_end;
    es->composition_len = 0;

    Free(lpResultStr);
}

static void EDIT_ImeComposition(HWND hwnd, LPARAM CompFlag, EDITSTATE *es)
{
    HIMC hIMC;
    int cursor;

    if (es->composition_len == 0 && es->selection_start != es->selection_end)
    {
        EDIT_EM_ReplaceSel(es, TRUE, NULL, 0, TRUE, TRUE);
        es->composition_start = es->selection_end;
    }

    hIMC = ImmGetContext(hwnd);
    if (!hIMC)
        return;

    if (CompFlag & GCS_RESULTSTR)
    {
        EDIT_GetResultStr(hIMC, es);
        cursor = 0;
    }
    else
    {
        if (CompFlag & GCS_COMPSTR)
            EDIT_GetCompositionStr(hIMC, CompFlag, es);
        cursor = ImmGetCompositionStringW(hIMC, GCS_CURSORPOS, 0, 0);
    }
    ImmReleaseContext(hwnd, hIMC);
    EDIT_SetCaretPos(es, es->selection_start + cursor, es->flags & EF_AFTER_WRAP);
}


/*********************************************************************
 *
 *	WM_NCCREATE
 *
 * See also EDIT_WM_StyleChanged
 */
static LRESULT EDIT_WM_NCCreate(HWND hwnd, LPCREATESTRUCTW lpcs)
{
	EDITSTATE *es;
	UINT alloc_size;

    TRACE("Creating edit control, style = %#lx\n", lpcs->style);

    if (!(es = Alloc(sizeof(*es))))
        return FALSE;
    SetWindowLongPtrW( hwnd, 0, (LONG_PTR)es );

       /*
        *      Note: since the EDITSTATE has not been fully initialized yet,
        *            we can't use any API calls that may send
        *            WM_XXX messages before WM_NCCREATE is completed.
        */

    es->style = lpcs->style;

        es->bEnableState = !(es->style & WS_DISABLED);

	es->hwndSelf = hwnd;
	/* Save parent, which will be notified by EN_* messages */
	es->hwndParent = lpcs->hwndParent;

	if (es->style & ES_COMBO)
	   es->hwndListBox = GetDlgItem(es->hwndParent, ID_CB_LISTBOX);

        /* FIXME: should we handle changes to WS_EX_RIGHT style after creation? */
        if (lpcs->dwExStyle & WS_EX_RIGHT) es->style |= ES_RIGHT;

        /* Number overrides lowercase overrides uppercase (at least it
         * does in Win95).  However I'll bet that ES_NUMBER would be
         * invalid under Win 3.1.
         */
        if (es->style & ES_NUMBER) {
                ; /* do not override the ES_NUMBER */
        }  else if (es->style & ES_LOWERCASE) {
                es->style &= ~ES_UPPERCASE;
        }
	if (es->style & ES_MULTILINE) {
		es->buffer_limit = BUFLIMIT_INITIAL;
		if (es->style & WS_VSCROLL)
			es->style |= ES_AUTOVSCROLL;
		if (es->style & WS_HSCROLL)
			es->style |= ES_AUTOHSCROLL;
		es->style &= ~ES_PASSWORD;
		if ((es->style & ES_CENTER) || (es->style & ES_RIGHT)) {
                        /* Confirmed - RIGHT overrides CENTER */
			if (es->style & ES_RIGHT)
				es->style &= ~ES_CENTER;
			es->style &= ~WS_HSCROLL;
			es->style &= ~ES_AUTOHSCROLL;
		}
	} else {
		es->buffer_limit = BUFLIMIT_INITIAL;
		if ((es->style & ES_RIGHT) && (es->style & ES_CENTER))
			es->style &= ~ES_CENTER;
		es->style &= ~WS_HSCROLL;
		es->style &= ~WS_VSCROLL;
		if (es->style & ES_PASSWORD)
			es->password_char = '*';
	}

	alloc_size = ROUND_TO_GROW((es->buffer_size + 1) * sizeof(WCHAR));
	if(!(es->hloc32W = LocalAlloc(LMEM_MOVEABLE | LMEM_ZEROINIT, alloc_size)))
	    goto cleanup;
	es->buffer_size = LocalSize(es->hloc32W)/sizeof(WCHAR) - 1;

	if (!(es->undo_text = Alloc((es->buffer_size + 1) * sizeof(WCHAR))))
		goto cleanup;
	es->undo_buffer_size = es->buffer_size;

	if (es->style & ES_MULTILINE)
	    if (!(es->first_line_def = Alloc(sizeof(LINEDEF))))
	        goto cleanup;
	es->line_count = 1;

	/*
	 * In Win95 look and feel, the WS_BORDER style is replaced by the
	 * WS_EX_CLIENTEDGE style for the edit control. This gives the edit
	 * control a nonclient area so we don't need to draw the border.
         * If WS_BORDER without WS_EX_CLIENTEDGE is specified we shouldn't have
         * a nonclient area and we should handle painting the border ourselves.
         *
         * When making modifications please ensure that the code still works
         * for edit controls created directly with style 0x50800000, exStyle 0
         * (which should have a single pixel border)
	 */
	if (lpcs->dwExStyle & WS_EX_CLIENTEDGE)
		es->style &= ~WS_BORDER;
        else if (es->style & WS_BORDER)
		SetWindowLongW(hwnd, GWL_STYLE, es->style & ~WS_BORDER);

	return TRUE;

cleanup:
	SetWindowLongPtrW(es->hwndSelf, 0, 0);
	EDIT_InvalidateUniscribeData(es);
	Free(es->first_line_def);
	Free(es->undo_text);
	if (es->hloc32W) LocalFree(es->hloc32W);
	Free(es->logAttr);
	Free(es);
	return FALSE;
}


/*********************************************************************
 *
 *	WM_CREATE
 *
 */
static LRESULT EDIT_WM_Create(EDITSTATE *es, const WCHAR *name)
{
    RECT clientRect;

    TRACE("%s\n", debugstr_w(name));

    /*
     * To initialize some final structure members, we call some helper
     * functions.  However, since the EDITSTATE is not consistent (i.e.
     * not fully initialized), we should be very careful which
     * functions can be called, and in what order.
     */
    EDIT_WM_SetFont(es, 0, FALSE);
    EDIT_EM_EmptyUndoBuffer(es);

    /* We need to calculate the format rect
       (applications may send EM_SETMARGINS before the control gets visible) */
    GetClientRect(es->hwndSelf, &clientRect);
    EDIT_SetRectNP(es, &clientRect);

    if (name && *name)
    {
        EDIT_EM_ReplaceSel(es, FALSE, name, lstrlenW(name), FALSE, FALSE);
        /* if we insert text to the editline, the text scrolls out
         * of the window, as the caret is placed after the insert
         * pos normally; thus we reset es->selection... to 0 and
         * update caret
         */
        es->selection_start = es->selection_end = 0;
        /* Adobe Photoshop does NOT like this. and MSDN says that EN_CHANGE
         * Messages are only to be sent when the USER does something to
         * change the contents. So I am removing this EN_CHANGE
         *
         * EDIT_NOTIFY_PARENT(es, EN_CHANGE);
         */
        EDIT_EM_ScrollCaret(es);
    }

    /* force scroll info update */
    EDIT_UpdateScrollInfo(es);
    OpenThemeData(es->hwndSelf, WC_EDITW);

    /* The rule seems to return 1 here for success */
    /* Power Builder masked edit controls will crash  */
    /* if not. */
    /* FIXME: is that in all cases so ? */
    return 1;
}


/*********************************************************************
 *
 *	WM_NCDESTROY
 *
 */
static LRESULT EDIT_WM_NCDestroy(EDITSTATE *es)
{
    LINEDEF *pc, *pp;
    HTHEME theme;

    theme = GetWindowTheme(es->hwndSelf);
    CloseThemeData(theme);

    /* The app can own the text buffer handle */
    if (es->hloc32W && (es->hloc32W != es->hlocapp))
        LocalFree(es->hloc32W);

    EDIT_InvalidateUniscribeData(es);

    pc = es->first_line_def;
    while (pc)
    {
        pp = pc->next;
        Free(pc);
        pc = pp;
    }

    SetWindowLongPtrW( es->hwndSelf, 0, 0 );
    Free(es->undo_text);
    Free(es->cue_banner_text);
    Free(es);

    return 0;
}

static LRESULT CALLBACK EDIT_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    EDITSTATE *es = (EDITSTATE *)GetWindowLongPtrW(hwnd, 0);
    LRESULT result = 0;
    RECT *rect;

    TRACE("hwnd %p, msg %#x, wparam %Ix, lparam %Ix\n", hwnd, msg, wParam, lParam);

    if (!es && msg != WM_NCCREATE)
        return DefWindowProcW(hwnd, msg, wParam, lParam);

    if (es && (msg != WM_NCDESTROY))
        EDIT_LockBuffer(es);

    switch (msg)
    {
    case EM_GETSEL:
        result = EDIT_EM_GetSel(es, (UINT *)wParam, (UINT *)lParam);
        break;

    case EM_SETSEL:
        EDIT_EM_SetSel(es, wParam, lParam, FALSE);
        EDIT_EM_ScrollCaret(es);
        result = 1;
        break;

    case EM_GETRECT:
        rect = (RECT *)lParam;
        if (rect)
            *rect = es->format_rect;
        break;

    case EM_SETRECT:
        if ((es->style & ES_MULTILINE) && lParam)
        {
            EDIT_SetRectNP(es, (RECT *)lParam);
            EDIT_UpdateText(es, NULL, TRUE);
        }
        break;

    case EM_SETRECTNP:
        if ((es->style & ES_MULTILINE) && lParam)
            EDIT_SetRectNP(es, (LPRECT)lParam);
        break;

    case EM_SCROLL:
        result = EDIT_EM_Scroll(es, (INT)wParam);
        break;

    case EM_LINESCROLL:
        result = (LRESULT)EDIT_EM_LineScroll(es, (INT)wParam, (INT)lParam);
        break;

    case EM_SCROLLCARET:
        EDIT_EM_ScrollCaret(es);
        result = 1;
        break;

    case EM_GETMODIFY:
        result = ((es->flags & EF_MODIFIED) != 0);
        break;

    case EM_SETMODIFY:
        if (wParam)
            es->flags |= EF_MODIFIED;
        else
            es->flags &= ~(EF_MODIFIED | EF_UPDATE);  /* reset pending updates */
        break;

    case EM_GETLINECOUNT:
        result = (es->style & ES_MULTILINE) ? es->line_count : 1;
        break;

    case EM_LINEINDEX:
        result = (LRESULT)EDIT_EM_LineIndex(es, (INT)wParam);
        break;

    case EM_SETHANDLE:
        EDIT_EM_SetHandle(es, (HLOCAL)wParam);
        break;

    case EM_GETHANDLE:
        result = (LRESULT)EDIT_EM_GetHandle(es);
        break;

    case EM_GETTHUMB:
        result = EDIT_EM_GetThumb(es);
        break;

    /* these messages missing from specs */
    case 0x00bf:
    case 0x00c0:
    case 0x00c3:
    case 0x00ca:
        FIXME("undocumented message 0x%x, please report\n", msg);
        result = DefWindowProcW(hwnd, msg, wParam, lParam);
        break;

    case EM_LINELENGTH:
        result = (LRESULT)EDIT_EM_LineLength(es, (INT)wParam);
        break;

    case EM_REPLACESEL:
    {
        const WCHAR *textW = (const WCHAR *)lParam;

        EDIT_EM_ReplaceSel(es, (BOOL)wParam, textW, lstrlenW(textW), TRUE, TRUE);
        result = 1;
        break;
    }

    case EM_GETLINE:
        result = (LRESULT)EDIT_EM_GetLine(es, (INT)wParam, (LPWSTR)lParam);
        break;

    case EM_SETLIMITTEXT:
        EDIT_EM_SetLimitText(es, wParam);
        break;

    case EM_CANUNDO:
        result = (LRESULT)EDIT_EM_CanUndo(es);
        break;

    case EM_UNDO:
    case WM_UNDO:
        result = (LRESULT)EDIT_EM_Undo(es);
        break;

    case EM_FMTLINES:
        result = (LRESULT)EDIT_EM_FmtLines(es, (BOOL)wParam);
        break;

    case EM_LINEFROMCHAR:
        result = (LRESULT)EDIT_EM_LineFromChar(es, (INT)wParam);
        break;

    case EM_SETTABSTOPS:
        result = (LRESULT)EDIT_EM_SetTabStops(es, (INT)wParam, (LPINT)lParam);
        break;

    case EM_SETPASSWORDCHAR:
        EDIT_EM_SetPasswordChar(es, wParam);
        break;

    case EM_EMPTYUNDOBUFFER:
        EDIT_EM_EmptyUndoBuffer(es);
        break;

    case EM_GETFIRSTVISIBLELINE:
        result = (es->style & ES_MULTILINE) ? es->y_offset : es->x_offset;
        break;

    case EM_SETREADONLY:
    {
        DWORD old_style = es->style;

        if (wParam)
        {
            SetWindowLongW(hwnd, GWL_STYLE, GetWindowLongW(hwnd, GWL_STYLE) | ES_READONLY);
            es->style |= ES_READONLY;
        }
        else
        {
            SetWindowLongW(hwnd, GWL_STYLE, GetWindowLongW(hwnd, GWL_STYLE) & ~ES_READONLY);
            es->style &= ~ES_READONLY;
        }

        if (old_style ^ es->style)
            InvalidateRect(es->hwndSelf, NULL, TRUE);

        result = 1;
        break;
    }

    case EM_SETWORDBREAKPROC:
        EDIT_EM_SetWordBreakProc(es, (void *)lParam);
        result = 1;
        break;

    case EM_GETWORDBREAKPROC:
        result = (LRESULT)es->word_break_proc;
        break;

    case EM_GETPASSWORDCHAR:
        result = es->password_char;
        break;

    case EM_SETMARGINS:
        EDIT_EM_SetMargins(es, (INT)wParam, LOWORD(lParam), HIWORD(lParam), TRUE);
        break;

    case EM_GETMARGINS:
        result = MAKELONG(es->left_margin, es->right_margin);
        break;

    case EM_GETLIMITTEXT:
        result = es->buffer_limit;
        break;

    case EM_POSFROMCHAR:
        if ((INT)wParam >= get_text_length(es)) result = -1;
        else result = EDIT_EM_PosFromChar(es, (INT)wParam, FALSE);
        break;

    case EM_CHARFROMPOS:
        result = EDIT_EM_CharFromPos(es, (short)LOWORD(lParam), (short)HIWORD(lParam));
        break;

    case EM_SETCUEBANNER:
        result = EDIT_EM_SetCueBanner(es, (BOOL)wParam, (const WCHAR *)lParam);
        break;

    case EM_GETCUEBANNER:
        result = EDIT_EM_GetCueBanner(es, (WCHAR *)wParam, (DWORD)lParam);
        break;

    case EM_SETIMESTATUS:
        if (wParam == EMSIS_COMPOSITIONSTRING)
            es->ime_status = lParam & 0xFFFF;

        result = 1;
        break;

    case EM_GETIMESTATUS:
        result = wParam == EMSIS_COMPOSITIONSTRING ? es->ime_status : 1;
        break;

    /* End of the EM_ messages which were in numerical order; what order
     * are these in?  vaguely alphabetical?
     */

    case WM_NCCREATE:
        result = EDIT_WM_NCCreate(hwnd, (LPCREATESTRUCTW)lParam);
        break;

    case WM_NCDESTROY:
        result = EDIT_WM_NCDestroy(es);
        es = NULL;
        break;

    case WM_GETDLGCODE:
        result = DLGC_HASSETSEL | DLGC_WANTCHARS | DLGC_WANTARROWS;

        if (es->style & ES_MULTILINE)
            result |= DLGC_WANTALLKEYS;

        if (lParam)
        {
            MSG *msg = (MSG *)lParam;
            es->flags |= EF_DIALOGMODE;

            if (msg->message == WM_KEYDOWN)
            {
                int vk = (int)msg->wParam;

                if (es->hwndListBox)
                {
                    if (vk == VK_RETURN || vk == VK_ESCAPE)
                        if (SendMessageW(GetParent(hwnd), CB_GETDROPPEDSTATE, 0, 0))
                            result |= DLGC_WANTMESSAGE;
                }
            }
        }
        break;

    case WM_CHAR:
    {
        WCHAR charW = wParam;

        if (es->hwndListBox)
        {
            if (charW == VK_RETURN || charW == VK_ESCAPE)
            {
                if (SendMessageW(GetParent(hwnd), CB_GETDROPPEDSTATE, 0, 0))
                    SendMessageW(GetParent(hwnd), WM_KEYDOWN, charW, 0);
                break;
            }
        }
        result = EDIT_WM_Char(es, charW);
        break;
    }

    case WM_UNICHAR:
        if (wParam == UNICODE_NOCHAR) return TRUE;
        if (wParam <= 0x000fffff)
        {
            if (wParam > 0xffff) /* convert to surrogates */
            {
                wParam -= 0x10000;
                EDIT_WM_Char(es, (wParam >> 10) + 0xd800);
                EDIT_WM_Char(es, (wParam & 0x03ff) + 0xdc00);
            }
            else
                EDIT_WM_Char(es, wParam);
        }
        return 0;

    case WM_CLEAR:
        EDIT_WM_Clear(es);
        break;

    case WM_CONTEXTMENU:
        EDIT_WM_ContextMenu(es, (short)LOWORD(lParam), (short)HIWORD(lParam));
        break;

    case WM_COPY:
        EDIT_WM_Copy(es);
        break;

    case WM_CREATE:
        result = EDIT_WM_Create(es, ((LPCREATESTRUCTW)lParam)->lpszName);
        break;

    case WM_CUT:
        EDIT_WM_Cut(es);
        break;

    case WM_ENABLE:
        es->bEnableState = (BOOL) wParam;
        EDIT_UpdateText(es, NULL, TRUE);
        if (GetWindowTheme(hwnd))
            RedrawWindow(hwnd, NULL, NULL, RDW_FRAME | RDW_INVALIDATE | RDW_UPDATENOW);
        break;

    case WM_ERASEBKGND:
        /* we do the proper erase in EDIT_WM_Paint */
        result = 1;
        break;

    case WM_GETFONT:
        result = (LRESULT)es->font;
        break;

    case WM_GETTEXT:
        result = (LRESULT)EDIT_WM_GetText(es, (INT)wParam, (LPWSTR)lParam);
        break;

    case WM_GETTEXTLENGTH:
        result = get_text_length(es);
        break;

    case WM_HSCROLL:
        result = EDIT_WM_HScroll(es, LOWORD(wParam), (short)HIWORD(wParam));
        break;

    case WM_KEYDOWN:
        result = EDIT_WM_KeyDown(es, (INT)wParam);
        break;

    case WM_KILLFOCUS:
        result = EDIT_WM_KillFocus(GetWindowTheme(hwnd), es);
        break;

    case WM_LBUTTONDBLCLK:
        result = EDIT_WM_LButtonDblClk(es);
        break;

    case WM_LBUTTONDOWN:
        result = EDIT_WM_LButtonDown(es, wParam, (short)LOWORD(lParam), (short)HIWORD(lParam));
        break;

    case WM_LBUTTONUP:
        result = EDIT_WM_LButtonUp(es);
        break;

    case WM_MBUTTONDOWN:
        result = EDIT_WM_MButtonDown(es);
        break;

    case WM_MOUSEMOVE:
        result = EDIT_WM_MouseMove(es, (short)LOWORD(lParam), (short)HIWORD(lParam));
        break;

    case WM_PRINTCLIENT:
    case WM_PAINT:
        EDIT_WM_Paint(es, (HDC)wParam);
        break;

    case WM_NCPAINT:
        EDIT_WM_NCPaint(hwnd, (HRGN)wParam);
        break;

    case WM_PASTE:
        EDIT_WM_Paste(es);
        break;

    case WM_SETFOCUS:
        EDIT_WM_SetFocus(GetWindowTheme(hwnd), es);
        break;

    case WM_SETFONT:
        EDIT_WM_SetFont(es, (HFONT)wParam, LOWORD(lParam) != 0);
        break;

    case WM_SETREDRAW:
        /* FIXME: actually set an internal flag and behave accordingly */
        break;

    case WM_SETTEXT:
        EDIT_WM_SetText(es, (const WCHAR *)lParam);
        result = TRUE;
        break;

    case WM_SIZE:
        EDIT_WM_Size(es, (UINT)wParam);
        break;

    case WM_STYLECHANGED:
        result = EDIT_WM_StyleChanged(es, wParam, (const STYLESTRUCT *)lParam);
        break;

    case WM_STYLECHANGING:
        result = 0; /* See EDIT_WM_StyleChanged */
        break;

    case WM_SYSKEYDOWN:
        result = EDIT_WM_SysKeyDown(es, (INT)wParam, (DWORD)lParam);
        break;

    case WM_TIMER:
        EDIT_WM_Timer(es);
        break;

    case WM_VSCROLL:
        result = EDIT_WM_VScroll(es, LOWORD(wParam), (short)HIWORD(wParam));
        break;

    case WM_MOUSEWHEEL:
    {
        int wheelDelta;
        INT pulScrollLines = 3;
        SystemParametersInfoW(SPI_GETWHEELSCROLLLINES,0, &pulScrollLines, 0);

        if (wParam & (MK_SHIFT | MK_CONTROL))
        {
            result = DefWindowProcW(hwnd, msg, wParam, lParam);
            break;
        }

        wheelDelta = GET_WHEEL_DELTA_WPARAM(wParam);
        /* if scrolling changes direction, ignore left overs */
        if ((wheelDelta < 0 && es->wheelDeltaRemainder < 0) ||
               (wheelDelta > 0 && es->wheelDeltaRemainder > 0))
                es->wheelDeltaRemainder += wheelDelta;
        else
            es->wheelDeltaRemainder = wheelDelta;

        if (es->wheelDeltaRemainder && pulScrollLines)
        {
            int cLineScroll;
            pulScrollLines = min(es->line_count, pulScrollLines);
            cLineScroll = pulScrollLines * es->wheelDeltaRemainder / WHEEL_DELTA;
            es->wheelDeltaRemainder -= WHEEL_DELTA * cLineScroll / pulScrollLines;
            result = EDIT_EM_LineScroll(es, 0, -cLineScroll);
        }
        break;
    }

    /* IME messages to make the edit control IME aware */
    case WM_IME_SETCONTEXT:
        break;

    case WM_IME_STARTCOMPOSITION:
        es->composition_start = es->selection_end;
        es->composition_len = 0;
        break;

    case WM_IME_COMPOSITION:
        if (lParam & GCS_RESULTSTR && !(es->ime_status & EIMES_GETCOMPSTRATONCE))
        {
            DefWindowProcW(hwnd, msg, wParam, lParam);
            break;
        }

        EDIT_ImeComposition(hwnd, lParam, es);
        break;

    case WM_IME_ENDCOMPOSITION:
        if (es->composition_len > 0)
        {
            EDIT_EM_ReplaceSel(es, TRUE, NULL, 0, TRUE, TRUE);
            es->selection_end = es->selection_start;
            es->composition_len= 0;
        }
        break;

    case WM_IME_COMPOSITIONFULL:
        break;

    case WM_IME_SELECT:
        break;

    case WM_IME_CONTROL:
        break;

    case WM_IME_REQUEST:
        switch (wParam)
        {
            case IMR_QUERYCHARPOSITION:
            {
                IMECHARPOSITION *chpos = (IMECHARPOSITION *)lParam;
                LRESULT pos;

                pos = EDIT_EM_PosFromChar(es, es->selection_start + chpos->dwCharPos, FALSE);
                chpos->pt.x = LOWORD(pos);
                chpos->pt.y = HIWORD(pos);
                chpos->cLineHeight = es->line_height;
                chpos->rcDocument = es->format_rect;
                MapWindowPoints(hwnd, 0, &chpos->pt, 1);
                MapWindowPoints(hwnd, 0, (POINT*)&chpos->rcDocument, 2);
                result = 1;
                break;
            }
        }
        break;

    case WM_THEMECHANGED:
        CloseThemeData(GetWindowTheme(hwnd));
        OpenThemeData(hwnd, WC_EDITW);
        InvalidateRect(hwnd, NULL, TRUE);
        break;

    default:
        result = DefWindowProcW(hwnd, msg, wParam, lParam);
        break;
    }

    if (IsWindow(hwnd) && es && msg != EM_GETHANDLE)
        EDIT_UnlockBuffer(es, FALSE);

    TRACE("hwnd=%p msg=%x -- %#Ix\n", hwnd, msg, result);

    return result;
}

void EDIT_Register(void)
{
    WNDCLASSW wndClass;

    memset(&wndClass, 0, sizeof(wndClass));
    wndClass.style = CS_PARENTDC | CS_GLOBALCLASS | CS_DBLCLKS;
    wndClass.lpfnWndProc = EDIT_WindowProc;
    wndClass.cbClsExtra = 0;
#ifdef __i386__
    wndClass.cbWndExtra = sizeof(EDITSTATE *) + sizeof(WORD);
#else
    wndClass.cbWndExtra = sizeof(EDITSTATE *);
#endif
    wndClass.hCursor = LoadCursorW(0, (LPWSTR)IDC_IBEAM);
    wndClass.hbrBackground = NULL;
    wndClass.lpszClassName = WC_EDITW;
    RegisterClassW(&wndClass);
}
