pax/booru-viewer
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image_viewer: accumulate scroll delta for zoom

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Same hi-res scroll fix — accumulate angleDelta to ±120 boundaries
before applying a zoom step. Uses 1.15^steps so multi-step scrolls
on standard mice still feel the same.

behavior change
This commit is contained in:
pax 2026-04-11 20:06:31 -05:00
parent 21f2fa1513
commit e9d1ca7b3a
1 changed files with 7 additions and 1 deletions
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8
booru_viewer/gui/media/image_viewer.py
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@ -22,6 +22,7 @@ class ImageViewer(QWidget):
self._offset = QPointF(0, 0) self._offset = QPointF(0, 0)
self._drag_start: QPointF | None = None self._drag_start: QPointF | None = None
self._drag_offset = QPointF(0, 0) self._drag_offset = QPointF(0, 0)
self._zoom_scroll_accum = 0
self.setMouseTracking(True) self.setMouseTracking(True)
self.setFocusPolicy(Qt.FocusPolicy.StrongFocus) self.setFocusPolicy(Qt.FocusPolicy.StrongFocus)
self._info_text = "" self._info_text = ""
@ -106,9 +107,14 @@ class ImageViewer(QWidget):
# Pure horizontal tilt — let parent handle (navigation) # Pure horizontal tilt — let parent handle (navigation)
event.ignore() event.ignore()
return return
self._zoom_scroll_accum += delta
steps = self._zoom_scroll_accum // 120
if not steps:
return
self._zoom_scroll_accum -= steps * 120
mouse_pos = event.position() mouse_pos = event.position()
old_zoom = self._zoom old_zoom = self._zoom
factor = 1.15 if delta > 0 else 1 / 1.15 factor = 1.15 ** steps
self._zoom = max(0.1, min(self._zoom * factor, 20.0)) self._zoom = max(0.1, min(self._zoom * factor, 20.0))
ratio = self._zoom / old_zoom ratio = self._zoom / old_zoom
self._offset = mouse_pos - ratio * (mouse_pos - self._offset) self._offset = mouse_pos - ratio * (mouse_pos - self._offset)