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silx.gui.plot.PlotWidget: Fixed matplotlib backend wheel support #4686

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Merged
loichuder merged 1 commit into from
Aug 4, 2026
Merged

silx.gui.plot.PlotWidget: Fixed matplotlib backend wheel support #4686

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37 changes: 25 additions & 12 deletions src/silx/gui/plot/backends/BackendMatplotlib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1704,18 +1704,31 @@ def wheelEvent(self, event):
# Fix here as we want to be able to use alt modifier in silx plot.
# https://github.com/silx-kit/silx/pull/4631
if event.angleDelta().y() == 0:
event = qt.QWheelEvent(
event.position(),
event.globalPosition(),
event.pixelDelta(),
qt.QPoint(0, event.angleDelta().x()),
event.buttons(),
event.modifiers(),
event.phase(),
event.isInverted(),

@t20100 t20100 Aug 1, 2026

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Typo here, there is no isInverted, it's inverted https://doc.qt.io/qt-6/qwheelevent.html#inverted-prop

event.source(),
event.pointingDevice(),
)
if qt.BINDING == "PyQt5":
event = qt.QWheelEvent(
event.position(),
event.globalPosition(),
event.pixelDelta(),
qt.QPoint(0, event.angleDelta().x()),
event.buttons(),
event.modifiers(),
event.phase(),
event.inverted(),
qt.Qt.MouseEventSynthesizedByApplication,

@t20100 t20100 Aug 1, 2026

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PyQt5 has no pointingDevice argument: https://doc.qt.io/archives/qt-5.15/qwheelevent.html#QWheelEvent-6

)
else:
event = qt.QWheelEvent(
event.position(),
event.globalPosition(),
event.pixelDelta(),
qt.QPoint(0, event.angleDelta().x()),
event.buttons(),
event.modifiers(),
event.phase(),
event.inverted(),
qt.Qt.MouseEventSynthesizedByApplication,

@t20100 t20100 Aug 1, 2026

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event.source() is obsolete in Qt6: https://doc.qt.io/qt-6/qmouseevent-obsolete.html#source, and so not available through PyQt6.
Though it works with PyQt5 and PySide6, I decided to do the same for all bindings (TBH I doubt it is ever retrieved).

event.pointingDevice(),
)
super().wheelEvent(event)
return

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