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fix(mobile): pinch + move scale (#21332) 

* fix: pinch + move scale

* added lost changes from #18744
pull/21108/head^2
waclaw66 2025-09-04 16:01:39 +07:00 committed by GitHub
parent 036d314cb6
commit 6c178a04dc
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1 changed files with 8 additions and 4 deletions
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12
mobile/lib/widgets/photo_view/src/core/photo_view_core.dart
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@ -121,7 +121,6 @@ class PhotoViewCore extends StatefulWidget {
class PhotoViewCoreState extends State<PhotoViewCore>
with TickerProviderStateMixin, PhotoViewControllerDelegate, HitCornersDetector {
Offset? _normalizedPosition;
double? _scaleBefore;
double? _rotationBefore;
@ -154,7 +153,6 @@ class PhotoViewCoreState extends State<PhotoViewCore>
void onScaleStart(ScaleStartDetails details) {
_rotationBefore = controller.rotation;
_scaleBefore = scale;
_normalizedPosition = details.focalPoint - controller.position;
_scaleAnimationController.stop();
_positionAnimationController.stop();
_rotationAnimationController.stop();
@ -166,8 +164,14 @@ class PhotoViewCoreState extends State<PhotoViewCore>
};
void onScaleUpdate(ScaleUpdateDetails details) {
final centeredFocalPoint = Offset(
details.focalPoint.dx - scaleBoundaries.outerSize.width / 2,
details.focalPoint.dy - scaleBoundaries.outerSize.height / 2,
);
final double newScale = _scaleBefore! * details.scale;
Offset delta = details.focalPoint - _normalizedPosition!;
final double scaleDelta = newScale / scale;
final Offset newPosition =
(controller.position + details.focalPointDelta) * scaleDelta - centeredFocalPoint * (scaleDelta - 1);
updateScaleStateFromNewScale(newScale);
@ -176,7 +180,7 @@ class PhotoViewCoreState extends State<PhotoViewCore>
updateMultiple(
scale: newScale,
position: panEnabled ? delta : clampPosition(position: delta * details.scale),
position: panEnabled ? newPosition : clampPosition(position: newPosition),
rotation: rotationEnabled ? _rotationBefore! + details.rotation : null,
rotationFocusPoint: rotationEnabled ? details.focalPoint : null,
);