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Code Issues Actions 5 Packages Projects Releases Wiki Activity

fix: android, two finger pan, scale (#8429)

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Signed-off-by: fufesou <linlong1266@gmail.com>
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fufesou 2024-06-21 09:07:32 +08:00 committed by GitHub
parent 0b32e741f7
commit 42394fcbdd
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2 changed files with 10 additions and 11 deletions
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2
flutter/lib/common/widgets/remote_input.dart
View File

@ -305,7 +305,7 @@ class _RawTouchGestureDetectorRegionState
}
} else {
// mobile
ffi.canvasModel.updateScale(d.scale / _scale);
ffi.canvasModel.updateScale(d.scale / _scale, d.focalPoint);
_scale = d.scale;
ffi.canvasModel.panX(d.focalPointDelta.dx);
ffi.canvasModel.panY(d.focalPointDelta.dy);

19
flutter/lib/models/model.dart
View File

@ -1576,22 +1576,21 @@ class CanvasModel with ChangeNotifier {
notifyListeners();
}
updateScale(double v) {
updateScale(double v, Offset focalPoint) {
if (parent.target?.imageModel.image == null) return;
final offset = parent.target?.cursorModel.offset ?? const Offset(0, 0);
var r = parent.target?.cursorModel.getVisibleRect() ?? Rect.zero;
final px0 = (offset.dx - r.left) * _scale;
final py0 = (offset.dy - r.top) * _scale;
final s = _scale;
_scale *= v;
final maxs = parent.target?.imageModel.maxScale ?? 1;
final mins = parent.target?.imageModel.minScale ?? 1;
if (_scale > maxs) _scale = maxs;
if (_scale < mins) _scale = mins;
r = parent.target?.cursorModel.getVisibleRect() ?? Rect.zero;
final px1 = (offset.dx - r.left) * _scale;
final py1 = (offset.dy - r.top) * _scale;
_x -= px1 - px0;
_y -= py1 - py0;
// (focalPoint.dx - _x_1) / s1 + displayOriginX = (focalPoint.dx - _x_2) / s2 + displayOriginX
// _x_2 = focalPoint.dx - (focalPoint.dx - _x_1) / s1 * s2
_x = focalPoint.dx - (focalPoint.dx - _x) / s * _scale;
final adjustForKeyboard = parent.target?.cursorModel.adjustForKeyboard() ?? 0.0;
// (focalPoint.dy - _y_1 + adjust) / s1 + displayOriginY = (focalPoint.dy - _y_2 + adjust) / s2 + displayOriginY
// _y_2 = focalPoint.dy + adjust - (focalPoint.dy - _y_1 + adjust) / s1 * s2
_y = focalPoint.dy + adjustForKeyboard - (focalPoint.dy - _y + adjustForKeyboard) / s * _scale;
notifyListeners();
}