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"""
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========================
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Widget testing utilities
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========================
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See also :mod:`matplotlib.tests.test_widgets`.
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"""
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from unittest import mock
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import matplotlib.pyplot as plt
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def get_ax():
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"""Create a plot and return its Axes."""
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fig, ax = plt.subplots(1, 1)
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ax.plot([0, 200], [0, 200])
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ax.set_aspect(1.0)
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fig.canvas.draw()
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return ax
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def noop(*args, **kwargs):
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pass
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def mock_event(ax, button=1, xdata=0, ydata=0, key=None, step=1):
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r"""
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Create a mock event that can stand in for `.Event` and its subclasses.
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This event is intended to be used in tests where it can be passed into
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event handling functions.
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Parameters
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----------
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ax : `~matplotlib.axes.Axes`
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The Axes the event will be in.
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xdata : float
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x coord of mouse in data coords.
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ydata : float
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y coord of mouse in data coords.
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button : None or `MouseButton` or {'up', 'down'}
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The mouse button pressed in this event (see also `.MouseEvent`).
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key : None or str
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The key pressed when the mouse event triggered (see also `.KeyEvent`).
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step : int
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Number of scroll steps (positive for 'up', negative for 'down').
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Returns
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-------
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event
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A `.Event`\-like Mock instance.
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"""
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event = mock.Mock()
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event.button = button
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event.x, event.y = ax.transData.transform([(xdata, ydata),
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(xdata, ydata)])[0]
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event.xdata, event.ydata = xdata, ydata
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event.inaxes = ax
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event.canvas = ax.get_figure(root=True).canvas
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event.key = key
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event.step = step
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event.guiEvent = None
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event.name = 'Custom'
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return event
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def do_event(tool, etype, button=1, xdata=0, ydata=0, key=None, step=1):
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"""
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Trigger an event on the given tool.
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Parameters
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----------
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tool : matplotlib.widgets.AxesWidget
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etype : str
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The event to trigger.
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xdata : float
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x coord of mouse in data coords.
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ydata : float
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y coord of mouse in data coords.
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button : None or `MouseButton` or {'up', 'down'}
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The mouse button pressed in this event (see also `.MouseEvent`).
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key : None or str
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The key pressed when the mouse event triggered (see also `.KeyEvent`).
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step : int
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Number of scroll steps (positive for 'up', negative for 'down').
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"""
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event = mock_event(tool.ax, button, xdata, ydata, key, step)
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func = getattr(tool, etype)
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func(event)
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def click_and_drag(tool, start, end, key=None):
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"""
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Helper to simulate a mouse drag operation.
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Parameters
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----------
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tool : `~matplotlib.widgets.Widget`
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start : [float, float]
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Starting point in data coordinates.
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end : [float, float]
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End point in data coordinates.
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key : None or str
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An optional key that is pressed during the whole operation
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(see also `.KeyEvent`).
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"""
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if key is not None:
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# Press key
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do_event(tool, 'on_key_press', xdata=start[0], ydata=start[1],
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button=1, key=key)
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# Click, move, and release mouse
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do_event(tool, 'press', xdata=start[0], ydata=start[1], button=1)
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do_event(tool, 'onmove', xdata=end[0], ydata=end[1], button=1)
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do_event(tool, 'release', xdata=end[0], ydata=end[1], button=1)
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if key is not None:
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# Release key
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do_event(tool, 'on_key_release', xdata=end[0], ydata=end[1],
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button=1, key=key)
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