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fix: Zoom sensitivity for trackpads #49

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fix: Zoom sensitivity for trackpads #49

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15 changes: 11 additions & 4 deletions mal_gui/model_view.py
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Original file line number Diff line number Diff line change
Expand Up @@ -25,10 +25,17 @@ def zoomOut(self):

def wheelEvent(self, event):
"""Overrides base"""
if event.angleDelta().y() > 0:
self.zoomIn()
else:
self.zoomOut()
# Touchpads report small pixel deltas at a high rate, mouse wheels
# report 120 units per notch. Scale the zoom by the actual distance
# scrolled so both feel similar and neither over-zooms.
pixel_delta = event.pixelDelta().y()
if pixel_delta:
self.zoom(1.005 ** pixel_delta)
return

angle_delta = event.angleDelta().y()
if angle_delta:
self.zoom(1.0015 ** angle_delta)

def zoom(self, factor):
"""Zoom one step with given factor"""
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