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#15 fixed. #68

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#15 fixed. #68

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c5d14a0
Add zoom limit for scaling.
lilygoli Jul 9, 2021
a39a0b8
improvement in zoom constraint design
lilygoli Jul 10, 2021
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6 changes: 5 additions & 1 deletion lib/src/crop.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -71,11 +71,13 @@ class _CropState extends State<Crop> with TickerProviderStateMixin {
final _repaintBoundaryKey = GlobalKey();

double _previousScale = 1;
double scaleLimit = 3; //default value 3
Offset _previousOffset = Offset.zero;
Offset _startOffset = Offset.zero;
Offset _endOffset = Offset.zero;
double _previousGestureRotation = 0.0;

set scaleLimitSetter(scale) => scaleLimit = scale;
/// Store the pointer count (finger involved to perform scaling).
///
/// This is used to compare with the value in
Expand Down Expand Up @@ -191,7 +193,9 @@ class _CropState extends State<Crop> with TickerProviderStateMixin {
void _onScaleUpdate(ScaleUpdateDetails details) {
widget.controller._offset += details.focalPoint - _previousOffset;
_previousOffset = details.focalPoint;
widget.controller._scale = _previousScale * details.scale;
if(_previousScale < scaleLimit){
widget.controller._scale = _previousScale * details.scale;
}
_startOffset = widget.controller._offset;
_endOffset = widget.controller._offset;

Expand Down