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"""This script shows how to create a minimalistic
:class:`~silx.gui.plot.actions.PlotAction` that clear the plot.

This illustrates how to add more buttons in a plot widget toolbar.
"""

__authors__ = ["T. VINCENT"]
__license__ = "MIT"
__date__ = "14/02/2018"


from silx.gui.plot.actions import PlotAction


class ClearPlotAction(PlotAction):
    """A QAction that can be added to PlotWidget toolbar to clear the plot"""

    def __init__(self, plot, parent=None):
        super(ClearPlotAction, self).__init__(
            plot,
            icon="close",
            text="Clear",
            tooltip="Clear the plot",
            triggered=self._clear,
            parent=parent,
        )

    def _clear(self):
        """Handle action triggered and clear the plot"""
        self.plot.clear()


if __name__ == "__main__":
    from silx.gui import qt
    from silx.gui.plot import Plot1D

    app = qt.QApplication([])  # First create QApplication

    plot = Plot1D()  # Create plotting widget

    # Create a toolbar and add it to the plot widget
    toolbar = qt.QToolBar()
    plot.addToolBar(toolbar)

    # Create clear action and add it to the toolbar
    action = ClearPlotAction(plot, parent=plot)
    toolbar.addAction(action)

    plot.addCurve((0, 1, 2, 3, 4), (0, 1, 1.5, 1, 0))  # Add a curve to the plot

    plot.show()  # Show the plot widget
    app.exec()  # Start Qt application
