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ShowsDebugPaint widget - paint outlines for a single widget and its child subtree - by Simon Lightfoot - 13/05/2020 (Not a fix for Flutter Web debug paint issue.. https://github.com/flutter/flutter/issues/32221 )
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// MIT License | |
// | |
// Copyright (c) 2020 Simon Lightfoot | |
// | |
// Permission is hereby granted, free of charge, to any person obtaining a copy | |
// of this software and associated documentation files (the "Software"), to deal | |
// in the Software without restriction, including without limitation the rights | |
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
// copies of the Software, and to permit persons to whom the Software is | |
// furnished to do so, subject to the following conditions: | |
// | |
// The above copyright notice and this permission notice shall be included in all | |
// copies or substantial portions of the Software. | |
// | |
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
// SOFTWARE. | |
// | |
import 'package:flutter/cupertino.dart'; | |
import 'package:flutter/rendering.dart'; | |
class ShowDebugPaint extends SingleChildRenderObjectWidget { | |
const ShowDebugPaint({ | |
Key? key, | |
this.enabled = true, | |
required Widget child, | |
}) : super(key: key, child: child); | |
final bool enabled; | |
@override | |
RenderObject createRenderObject(BuildContext context) { | |
return RenderShowDebugPaint(enabled: enabled); | |
} | |
@override | |
void updateRenderObject(BuildContext context, RenderShowDebugPaint renderObject) { | |
renderObject.enabled = enabled; | |
} | |
} | |
class RenderShowDebugPaint extends RenderProxyBox { | |
RenderShowDebugPaint({ | |
required bool enabled, | |
RenderBox? child, | |
}) : _enabled = enabled, | |
super(child); | |
bool _enabled; | |
bool get enabled => _enabled; | |
set enabled(bool value) { | |
if (_enabled != value) { | |
_enabled = value; | |
markNeedsPaint(); | |
} | |
} | |
@override | |
void paint(PaintingContext context, Offset offset) { | |
final previousState = debugPaintSizeEnabled; | |
debugPaintSizeEnabled = enabled; | |
super.paint(context, offset); | |
debugPaintSizeEnabled = previousState; | |
} | |
} |
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