Trigger events via standard callbacks in widget testing. by anntzer · Pull Request #29993 · matplotlib/matplotlib · GitHub
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Trigger events via standard callbacks in widget testing. #29993

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Merged
QuLogic merged 1 commit into from
Jul 31, 2025
Merged

Trigger events via standard callbacks in widget testing. #29993

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4 changes: 4 additions & 0 deletions doc/api/next_api_changes/deprecations/29993-AL.rst
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33 changes: 33 additions & 0 deletions lib/matplotlib/backend_bases.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1411,6 +1411,23 @@ def __init__(self, name, canvas, x, y, button=None, key=None,
self.step = step
self.dblclick = dblclick

@classmethod
def _from_ax_coords(cls, name, ax, xy, *args, **kwargs):
"""
Generate a synthetic event at a given axes coordinate.

This method is intended for creating events during testing. The event
can be emitted by calling its ``_process()`` method.

args and kwargs are mapped to `.MouseEvent.__init__` parameters,
starting with `button`.
"""
x, y = ax.transData.transform(xy)
event = cls(name, ax.figure.canvas, x, y, *args, **kwargs)
event.inaxes = ax
event.xdata, event.ydata = xy # Force exact xy to avoid fp roundtrip issues.
return event

def __str__(self):
return (f"{self.name}: "
f"xy=({self.x}, {self.y}) xydata=({self.xdata}, {self.ydata}) "
Expand Down Expand Up @@ -1503,6 +1520,22 @@ def __init__(self, name, canvas, key, x=0, y=0, guiEvent=None):
super().__init__(name, canvas, x, y, guiEvent=guiEvent)
self.key = key

@classmethod
def _from_ax_coords(cls, name, ax, xy, key, *args, **kwargs):
"""
Generate a synthetic event at a given axes coordinate.

This method is intended for creating events during testing. The event
can be emitted by calling its ``_process()`` method.
"""
# Separate from MouseEvent._from_ax_coords instead of being defined in the base
# class, due to different parameter order in the constructor signature.
x, y = ax.transData.transform(xy)
event = cls(name, ax.figure.canvas, key, x, y, *args, **kwargs)
event.inaxes = ax
event.xdata, event.ydata = xy # Force exact xy to avoid fp roundtrip issues.
return event


# Default callback for key events.
def _key_handler(event):
Expand Down
23 changes: 12 additions & 11 deletions lib/matplotlib/testing/widgets.py
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