min_interaction.dart
2.08 KB
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import 'package:flutter/cupertino.dart';
import 'package:flutter/rendering.dart';
import 'package:meta/meta.dart';
/// A widget that add a min interaction zone where hitTestSelf is true
/// This is rarely used by its own
///
/// See also:
///
/// * [Sheet], that uses this widget that enables to drag closed/hidden
/// sheets
@internal
class MinInteractionZone extends SingleChildRenderObjectWidget {
const MinInteractionZone({
required this.direction,
required this.extent,
super.child,
});
final AxisDirection direction;
final double extent;
@override
MinInteractionPaddingRenderBox createRenderObject(BuildContext context) {
return MinInteractionPaddingRenderBox(direction, extent);
}
@override
void updateRenderObject(
BuildContext context, MinInteractionPaddingRenderBox renderObject) {
renderObject
..direction = direction
..extent = extent;
}
}
class MinInteractionPaddingRenderBox extends RenderProxyBox {
MinInteractionPaddingRenderBox(AxisDirection direction, double extent)
: _direction = direction,
_extent = extent;
AxisDirection _direction;
AxisDirection get direction => _direction;
set direction(AxisDirection value) {
if (value == _direction) return;
_direction = value;
}
double _extent;
double get extent => _extent;
set extent(double value) {
if (value == _extent) return;
_extent = value;
}
@override
bool hitTestSelf(Offset position) {
Rect minInteractionZone;
switch (direction) {
case AxisDirection.up:
minInteractionZone =
Rect.fromLTRB(0, size.height - extent, size.width, size.height);
break;
case AxisDirection.down:
minInteractionZone = Rect.fromLTRB(0, 0, size.width, extent);
break;
case AxisDirection.right:
minInteractionZone = Rect.fromLTRB(0, 0, extent, size.height);
break;
case AxisDirection.left:
minInteractionZone =
Rect.fromLTRB(size.width - extent, 0, size.width, size.height);
break;
}
return minInteractionZone.contains(position);
}
}