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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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1 change: 1 addition & 0 deletions example/lib/main.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -138,6 +138,7 @@ class _MyHomePageState extends State<MyHomePage> {
),
)
: null,
scaleLimit: 3.0,
),
),
),
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7 changes: 7 additions & 0 deletions lib/src/crop.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,7 @@ class Crop extends StatefulWidget {
final BoxShape shape;
final ValueChanged<MatrixDecomposition>? onChanged;
final Duration animationDuration;
final double? scaleLimit;

const Crop({
Key? key,
Expand All @@ -38,6 +39,7 @@ class Crop extends StatefulWidget {
this.interactive = true,
this.shape = BoxShape.rectangle,
this.onChanged,
this.scaleLimit,
this.animationDuration = const Duration(milliseconds: 200),
}) : super(key: key);

Expand Down Expand Up @@ -71,11 +73,13 @@ class _CropState extends State<Crop> with TickerProviderStateMixin {
final _repaintBoundaryKey = GlobalKey();

double _previousScale = 1;

Offset _previousOffset = Offset.zero;
Offset _startOffset = Offset.zero;
Offset _endOffset = Offset.zero;
double _previousGestureRotation = 0.0;


/// Store the pointer count (finger involved to perform scaling).
///
/// This is used to compare with the value in
Expand Down Expand Up @@ -192,6 +196,9 @@ class _CropState extends State<Crop> with TickerProviderStateMixin {
widget.controller._offset += details.focalPoint - _previousOffset;
_previousOffset = details.focalPoint;
widget.controller._scale = _previousScale * details.scale;
if(widget.scaleLimit != null && widget.controller._scale > widget.scaleLimit!){
widget.controller._scale = widget.scaleLimit!;
}
_startOffset = widget.controller._offset;
_endOffset = widget.controller._offset;

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