{"id":312,"date":"2022-03-03T21:15:58","date_gmt":"2022-03-03T13:15:58","guid":{"rendered":"https:\/\/blog.iichen.cn\/?p=312"},"modified":"2022-03-03T21:15:58","modified_gmt":"2022-03-03T13:15:58","slug":"flutter-singlechildrenderobjectwidget","status":"publish","type":"post","link":"https:\/\/iichen.cn\/?p=312","title":{"rendered":"Flutter-SingleChildRenderObjectWidget"},"content":{"rendered":"<h4>\u4e00\u3001\u5b9e\u73b0\u65f6\u95f4\u8f74\u6548\u679c<\/h4>\n<pre><code class=\"language-dart line-numbers\">\/\/ \u5b9e\u73b0\u65f6\u95f4\u8f74\u6548\u679c\nclass CusRenderBox extends SingleChildRenderObjectWidget{\n  final double size;\n\n  CusRenderBox({Widget child,this.size = 0}):super(child: child);\n\n  @override\n  RenderObject createRenderObject(BuildContext context) {\n    return RenderCusRenderBox(size);\n  }\n\n  @override\n  void updateRenderObject(BuildContext context, covariant RenderCusRenderBox renderObject) {\n     \/\/ \u9632\u6b62\u66f4\u65b0\u4ea7\u751f \u810f\u6570\u636e\u5bfc\u81f4\u9875\u9762\u672a\u53ca\u65f6\u9884\u671f\u5237\u65b0\n    renderObject.sizes = size;\n  }\n}\n\nclass RenderCusRenderBox extends RenderBox with RenderObjectWithChildMixin{\n  double sizes = 5;\n\n  Paint _paint = Paint()\n    ..color = Colors.yellow\n    ..strokeWidth = 3;\n\n  RenderCusRenderBox(this.sizes);\n\n  @override\n  void performLayout() {\n     \/\/ parentUsesSize\u9ed8\u8ba4false,\u4f1a\u521b\u5efarelayout boundary \u4f18\u5316\u6027\u80fd\n     \/\/ \u5f53\u9700\u8981\u4f7f\u7528 child\u5c3a\u5bf8\u9700\u8981\u8bbe\u4e3atrue\n    child.layout(constraints,parentUsesSize\u9ed8\u8ba4false,\u4f1a\u521b\u5efarelayout boundary \u4f18\u5316\u6027\u80fd\n                \/\/ \u5f53\u9700\u8981\u4f7f\u7528 child\u5c3a\u5bf8\u9700\u8981\u8bbe\u4e3atrue: true);\n    size = (child as RenderBox).size;\n  }\n\n  @override\n  void paint(PaintingContext context, Offset offset) {\n    print(\"##########  ${size.width}  ${size.height} ${offset.dx} ${offset.dy}\");\n    context.canvas.drawRect(Rect.fromLTRB(offset.dx, offset.dy, offset.dx + 5, offset.dy + size.height), _paint);\n    context.canvas.drawCircle(offset + Offset(2,size.height \/ 2), 5, _paint..color = Colors.black);\n    context.canvas.drawCircle(offset + Offset(2,size.height \/ 2), 8, _paint..color = Colors.black.withAlpha(124));\n    context.paintChild(child, offset);\n  }\n}\n<\/code><\/pre>\n<h4>\u4e8c\u3001\u7b80\u5316\u64cd\u4f5c<\/h4>\n<pre><code class=\"language-dart line-numbers\">\/\/ \u76f4\u63a5\u7ee7\u627f RenderProxyBox \u65e0\u9700\u91cd\u5199performLayout\nclass RenderCusRenderBox extends RenderProxyBox{\n  double sizes = 5;\n\n  Paint _paint = Paint()\n    ..color = Colors.yellow\n    ..strokeWidth = 3;\n\n  RenderCusRenderBox(this.sizes);\n\n  @override\n  void paint(PaintingContext context, Offset offset) {\n    print(\"##########  ${size.width}  ${size.height} ${offset.dx} ${offset.dy}\");\n    context.canvas.drawRect(Rect.fromLTRB(offset.dx, offset.dy, offset.dx + 5, offset.dy + size.height), _paint);\n    context.canvas.drawCircle(offset + Offset(2,size.height \/ 2), 5, _paint..color = Colors.black);\n    context.canvas.drawCircle(offset + Offset(2,size.height \/ 2), 8, _paint..color = Colors.black.withAlpha(124));\n    context.paintChild(child, offset);\n  }\n}\n<\/code><\/pre>\n<h4>\u4e09\u3001\u6c14\u6ce1<\/h4>\n<pre><code class=\"language-dart line-numbers\">import 'package:flutter\/cupertino.dart';\nimport 'package:flutter\/material.dart';\nimport 'package:flutter\/rendering.dart';\n\nenum TriangleBubbleAxis{\n  LEFT,TOP,RIGHT,BOTTOM\n}\nclass BubbleRenderBoxWidget extends SingleChildRenderObjectWidget {\n  final double triangleWidth;\n  final double triangleHeight;\n  final double offset;\n  final TriangleBubbleAxis axis;\n  final Color color;\n\n  BubbleRenderBoxWidget({\n    Widget child,\n    this.triangleWidth,\n    this.triangleHeight,\n    this.offset,\n    this.axis,\n    this.color\n  }):super(child: child);\n\n  @override\n  RenderObject createRenderObject(BuildContext context) {\n    return BubbleRenderBox(\n      triangleWidth:triangleWidth,\n      triangleHeight:triangleHeight,\n      offset:offset,\n      axis:axis,\n      color:color,\n    );\n  }\n\n  @override\n  void updateRenderObject(BuildContext context, covariant BubbleRenderBox renderObject) {\n    renderObject..triangleHeight = triangleHeight\n        ..triangleWidth = triangleWidth\n        ..color = color\n        ..offset = offset\n        ..axis = axis;\n\n  }\n}\n\nclass BubbleRenderBox extends RenderBox with RenderObjectWithChildMixin {\n  Path _path;\n  Paint _paint;\n\n  double triangleWidth;\n  double triangleHeight;\n  double offset;\n  TriangleBubbleAxis axis;\n  Color color;\n\n  BubbleRenderBox({\n    this.triangleWidth,\n    this.triangleHeight,\n    this.offset,\n    this.axis,\n    this.color\n  }){\n    _path = Path();\n    _paint = Paint()\n      ..style = PaintingStyle.fill\n      ..color = color;\n  }\n\n  @override\n  void performLayout() {\n    child.layout(constraints,parentUsesSize: true);\n    size = (child as RenderBox).size;\n  }\n\n  @override\n  void paint(PaintingContext context, Offset offset) {\n    if(axis == TriangleBubbleAxis.BOTTOM){\n      _path.moveTo(offset.dx + this.offset, offset.dy + size.height);\n      _path.lineTo(offset.dx + this.offset +  triangleWidth \/ 2, offset.dy + size.height + triangleHeight);\n      _path.lineTo(offset.dx + this.offset +  triangleWidth, offset.dy + size.height);\n      _path.close();\n    }else if(axis == TriangleBubbleAxis.LEFT){\n      _path.moveTo(offset.dx, offset.dy + this.offset);\n      _path.lineTo(offset.dx - triangleHeight, offset.dy + this.offset + triangleWidth \/ 2);\n      _path.lineTo(offset.dx, offset.dy + this.offset + triangleWidth);\n      _path.close();\n    }else if(axis == TriangleBubbleAxis.RIGHT){\n      _path.moveTo(offset.dx + size.width, offset.dy + this.offset);\n      _path.lineTo(offset.dx + size.width + triangleHeight, offset.dy + this.offset + triangleWidth \/ 2);\n      _path.lineTo(offset.dx + size.width, offset.dy + this.offset + triangleWidth);\n      _path.close();\n    }else{\n      _path.moveTo(offset.dx + this.offset, offset.dy);\n      _path.lineTo(offset.dx + this.offset +  triangleWidth \/ 2, offset.dy - triangleHeight);\n      _path.lineTo(offset.dx + this.offset +  triangleWidth, offset.dy);\n      _path.close();\n    }\n    context.canvas.drawPath(_path, _paint);\n    context.paintChild(child, offset);\n    super.paint(context, offset);\n  }\n}\n\n\/*\nContainer(\n        margin: const EdgeInsets.all(35),\n        decoration: BoxDecoration(\n          boxShadow: [\n            BoxShadow(\n                color: Colors.black12,\n                offset: Offset(0.0, 12.0), \/\/\u9634\u5f71xy\u8f74\u504f\u79fb\u91cf\n                blurRadius: 20.0, \/\/\u9634\u5f71\u6a21\u7cca\u7a0b\u5ea6\n                spreadRadius: 0.1\/\/\u9634\u5f71\u6269\u6563\u7a0b\u5ea6\n            )\n          ],\n          borderRadius: BorderRadius.circular(18),\n          color: Colors.white\n        ),\n        child: BubbleRenderBoxWidget(\n          triangleHeight: 15,\n          triangleWidth: 30,\n          color: Colors.white,\n          offset: 45,\n          axis: TriangleBubbleAxis.BOTTOM,\n          child: Container(\n            padding: const EdgeInsets.all(15),\n            child: Column(\n              mainAxisSize: MainAxisSize.min,\n              children: [\n                Text(\"\u6211\u597d\u7231\u4f60\u554a\uff01\uff01\uff01\uff01\uff01\",style: TextStyle(fontSize: 16,color: Colors.black),),\n                Text(\"\u6211\u597d\u7231\u4f60\u554a\uff01\uff01\uff01\uff01\uff01\",style: TextStyle(fontSize: 16,color: Colors.black),),\n                Text(\"\u6211\u597d\u7231\u4f60\u554a\uff01\uff01\uff01\uff01\uff01\",style: TextStyle(fontSize: 16,color: Colors.black),),\n                Text(\"\u6211\u597d\u7231\u4f60\u554a\uff01\uff01\uff01\uff01\uff01\",style: TextStyle(fontSize: 16,color: Colors.black),),\n                Text(\"\u6211\u597d\u7231\u4f60\u554a\uff01\uff01\uff01\uff01\uff01\",style: TextStyle(fontSize: 16,color: Colors.black),),\n                Text(\"\u6211\u597d\u7231\u4f60\u554a\uff01\uff01\uff01\uff01\uff01\",style: TextStyle(fontSize: 16,color: Colors.black),),\n                Text(\"\u6211\u597d\u7231\u4f60\u554a\uff01\uff01\uff01\uff01\uff01\",style: TextStyle(fontSize: 16,color: Colors.black),),\n                Text(\"\u6211\u597d\u7231\u4f60\u554a\uff01\uff01\uff01\uff01\uff01\",style: TextStyle(fontSize: 16,color: Colors.black),),\n                Text(\"\u6211\u597d\u7231\u4f60\u554a\uff01\uff01\uff01\uff01\uff01\",style: TextStyle(fontSize: 16,color: Colors.black),),\n                Text(\"\u6211\u597d\u7231\u4f60\u554a\uff01\uff01\uff01\uff01\uff01\",style: TextStyle(fontSize: 16,color: Colors.black),),\n              ],\n            ),\n          ),\n        ),\n      ),\n *\/\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001\u5b9e\u73b0\u65f6\u95f4\u8f74\u6548\u679c \/\/ \u5b9e\u73b0\u65f6\u95f4\u8f74\u6548\u679c class CusRenderBox extends SingleC [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12,8],"tags":[],"class_list":["post-312","post","type-post","status-publish","format-standard","hentry","category-flutter","category-8"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Flutter-SingleChildRenderObjectWidget - IIchen<\/title>\n<meta name=\"description\" content=\"Flutter\u81ea\u5b9a\u4e49\u5e03\u5c40SingleChildRenderObjectWidget\u5b9e\u73b0\u65f6\u95f4\u8f74\u7b49\u529f\u80fd(\u5728paint\u65b9\u6cd5\u5185\u8fdb\u884c\u7ed8\u5236\u5373\u53ef)\" 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