{"id":315,"date":"2022-03-03T22:29:10","date_gmt":"2022-03-03T14:29:10","guid":{"rendered":"https:\/\/blog.iichen.cn\/?p=315"},"modified":"2022-03-03T22:29:10","modified_gmt":"2022-03-03T14:29:10","slug":"flutter-multichildrenderobjectwidget","status":"publish","type":"post","link":"https:\/\/iichen.cn\/?p=315","title":{"rendered":"Flutter-MultiChildRenderObjectWidget"},"content":{"rendered":"<h4>\u4e00\u3001\u521d\u6b65\u4f7f\u7528-\u548cSingleChildRenderObjectWidget\u7c7b\u4f3c<\/h4>\n<ul>\n<li>\n<ol>\n<li>class CusRenderBox extends SingleChildRenderObjectWidget\/MultiChildRenderObjectWidget<\/li>\n<\/ol>\n<\/li>\n<li>\n<ol start=\"2\">\n<li>\u4e0d\u540c\u70b9\uff1a<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<pre><code class=\"language-dart line-numbers\">\/\/ \u53ef\u4ee5\u8fdb\u884c\u5185\u90e8\u7ed8\u5236\n\/\/ class RenderCusRenderBox extends RenderBox with RenderObjectWithChildMixin{\nclass RenderCusRenderBox extends RenderProxyBox{}\n\n\/\/ \u53ef\u4ee5\u8fdb\u884c\u5185\u90e8\u7ed8\u5236-\u9700\u8981\u989d\u5916\u8bbe\u7f6eContainerBoxParentData\u4ee5\u53ca\u591a\u4e2a\u5b69\u5b50\u7684\u5e03\u5c40\n\/\/ CustomMultiChildLayout \u9700\u8981\u5c06 \u7ed8\u5236Widget Child\u4f20\u8fdb\u6765 \u5185\u90e8\u4e0d\u80fd\u7ed8\u5236\nclass RenderCloudWidget extends RenderBox\n    with ContainerRenderObjectMixin&lt;RenderBox, RenderCloudParentData&gt;,\n        RenderBoxContainerDefaultsMixin&lt;RenderBox, RenderCloudParentData&gt; {}\n<\/code><\/pre>\n<h5>1.1 ContainerRenderObjectMixin<\/h5>\n<pre><code class=\"language-dart line-numbers\">\u4e3b\u8981\u662f\u7ef4\u62a4\u63d0\u4f9b\u4e86\u4e00\u4e2a\u53cc\u94fe\u8868\u7684 children RenderObject \u3002\n\u901a\u8fc7\u5728 RenderBox \u91cc\u6df7\u5165 ContainerRenderObjectMixin \uff0c \u6211\u4eec\u5c31\u53ef\u4ee5\u5f97\u5230\u4e00\u4e2a\u53cc\u94fe\u8868\u7684 children \uff0c\n\u65b9\u4fbf\u5728\u6211\u4eec\u5e03\u5c40\u65f6\uff0c\u53ef\u4ee5\u6b63\u5411\u6216\u8005\u53cd\u5411\u53bb\u83b7\u53d6\u548c\u7ba1\u7406 RenderObject\n\n<\/code><\/pre>\n<h5>1.2 RenderBoxContainerDefaultsMixin<\/h5>\n<pre><code class=\"language-dart line-numbers\">RenderBoxContainerDefaultsMixin \u4e3b\u8981\u662f\u5bf9 ContainerRenderObjectMixin \u7684\u62d3\u5c55\uff0c\u662f\u5bf9 ContainerRenderObjectMixin \u5185\u7684 children \u63d0\u4f9b\u5e38\u7528\u7684\u9ed8\u8ba4\u884c\u4e3a\u548c\u7ba1\u7406\n\n\/\/\/ \u8ba1\u7b97\u8fd4\u56de\u7b2c\u4e00\u4e2a child \u7684\u57fa\u7ebf \uff0c\u5e38\u7528\u4e8e child \u7684\u4f4d\u7f6e\u987a\u5e8f\u6709\u5173\ndouble defaultComputeDistanceToFirstActualBaseline(TextBaseline baseline)\n\n\/\/\/ \u8ba1\u7b97\u8fd4\u56de\u6240\u6709 child \u4e2d\u6700\u5c0f\u7684\u57fa\u7ebf\uff0c\u5e38\u7528\u4e8e child \u7684\u4f4d\u7f6e\u987a\u5e8f\u65e0\u5173\ndouble defaultComputeDistanceToHighestActualBaseline(TextBaseline baseline)\n\n\/\/\/ \u89e6\u6478\u78b0\u649e\u6d4b\u8bd5\nbool defaultHitTestChildren(BoxHitTestResult result, { Offset position })\n\n\/\/\/ \u9ed8\u8ba4\u7ed8\u5236\nvoid defaultPaint(PaintingContext context, Offset offset)\n\n\/\/\/ \u4ee5\u6570\u7ec4\u65b9\u5f0f\u8fd4\u56de child \u94fe\u8868\nList&lt;ChildType&gt; getChildrenAsList()\n\n<\/code><\/pre>\n<h5>1.3 ContainerBoxParentData<\/h5>\n<pre><code class=\"language-dart line-numbers\">ContainerBoxParentData \u662f BoxParentData \u7684\u5b50\u7c7b\uff0c\n\u4e3b\u8981\u662f\u5173\u8054\u4e86 ContainerDefaultsMixin \u548c BoxParentData \uff0cBoxParentData \u662f RenderBox \u7ed8\u5236\u65f6\u6240\u9700\u7684\u4f4d\u7f6e\u7c7b\u3002\n\n\u901a\u8fc7 ContainerBoxParentData \uff0c\u6211\u4eec\u53ef\u4ee5\u5c06 RenderBox \u9700\u8981\u7684 BoxParentData \u548c\u4e0a\u9762\u7684 ContainerParentDataMixin \u7ec4\u5408\u8d77\u6765\uff0c\n\u4e8b\u5b9e\u4e0a\u6211\u4eec\u5f97\u5230\u7684 children \u53cc\u94fe\u8868\u5c31\u662f\u4ee5 ParentData \u7684\u5f62\u5f0f\u5448\u73b0\u51fa\u6765\u7684\n\n<\/code><\/pre>\n<h5>1.4 \u5b9e\u73b0\u6b65\u9aa4<\/h5>\n<ul>\n<li>1\u3001\u81ea\u5b9a\u4e49 ParentData \u7ee7\u627f ContainerBoxParentData \u3002<\/li>\n<li>2\u3001\u7ee7\u627f RenderBox \uff0c\u540c\u65f6\u6df7\u5165 ContainerRenderObjectMixin \u548c RenderBoxContainerDefaultsMixin \u5b9e\u73b0\u81ea\u5b9a\u4e49RenderObject \u3002<\/li>\n<li>3\u3001\u7ee7\u627f MultiChildRenderObjectWidget\uff0c\u5b9e\u73b0 createRenderObject \u548c updateRenderObject \u65b9\u6cd5\uff0c\u5173\u8054\u6211\u4eec\u81ea\u5b9a\u4e49\u7684 RenderBox\u3002<\/li>\n<li>4\u3001override RenderBox \u7684 performLayout \u548c setupParentData \u65b9\u6cd5\uff0c\u5b9e\u73b0\u81ea\u5b9a\u4e49\u5e03\u5c40<\/li>\n<\/ul>\n<h4>\u4e8c\u3001\u7b80\u5316-\u76f4\u63a5\u4f7f\u7528CustomMultiChildLayout<\/h4>\n<blockquote><p>\n  CustomMultiChildLayout \u662f Flutter \u4e3a\u6211\u4eec\u5c01\u88c5\u7684\u7b80\u5316\u81ea\u5b9a\u4e49\u5e03\u5c40\u5b9e\u73b0\uff0c\u5b83\u7684\u5185\u90e8\u540c\u6837\u662f\u901a\u8fc7 MultiChildRenderObjectWidget \u5b9e\u73b0\uff0c\u4f46\u662f\u5b83\u4e3a\u6211\u4eec\u5c01\u88c5\u4e86 RenderCustomMultiChildLayoutBox \u548c MultiChildLayoutParentData \uff0c\u5e76\u901a\u8fc7 MultiChildLayoutDelegate \u66b4\u9732\u51fa\u9700\u8981\u81ea\u5b9a\u4e49\u7684\u5730\u65b9\n<\/p><\/blockquote>\n<pre><code class=\"language-dart line-numbers\">\u53ea\u9700\u8981\u7ee7\u627f MultiChildLayoutDelegate \uff0c\u5e76\u5b9e\u73b0\u5982\u4e0b\u65b9\u6cd5\u5373\u53ef\nvoid performLayout(Size size);\n\nbool shouldRelayout(covariant MultiChildLayoutDelegate oldDelegate);\n\n<\/code><\/pre>\n<blockquote><p>\n  \u53c2\u8003\n<\/p><\/blockquote>\n<pre><code class=\"language-dart line-numbers\">Container(\n    color: Colors.black54,\n    child: CustomMultiChildLayout(\n        delegate: CircleLayoutDelegate(\n            [\"a\",\"b\",\"c\",\"d\",\"e\"],\n            center: Offset(200,500)\n        ),\n        children: [\n            LayoutId(\n                id: \"a\",\n                child: Text(\"a\"),\n            ),\n            LayoutId(\n                id: \"b\",\n                child: Text(\"b\"),\n            ),\n            LayoutId(\n                id: \"c\",\n                child: Text(\"a\"),\n            ),\n            LayoutId(\n                id: \"d\",\n                child: Text(\"d\"),\n            ),\n            LayoutId(\n                id: \"e\",\n                child: Text(\"e\"),\n            ),\n        ],\n    )\n)\n\n\/\/\/\u81ea\u5b9a\u4e49\u5b9e\u73b0\u5706\u5f62\u5e03\u5c40\nclass CircleLayoutDelegate extends MultiChildLayoutDelegate {\n  final List&lt;String&gt; customLayoutId;\n\n  final Offset center;\n\n  Size? childSize;\n\n  CircleLayoutDelegate(this.customLayoutId,\n      {this.center = Offset.zero, this.childSize});\n\n  @override\n  void performLayout(Size size) {\n    for (var item in customLayoutId) {\n      if (hasChild(item)) {\n        double r = 100;\n\n        int index = int.parse(item);\n\n        double step = 360 \/ customLayoutId.length;\n\n        double hd = (2 * math.pi \/ 360) * step * index;\n\n        var x = center.dx + math.sin(hd) * r;\n\n        var y = center.dy - math.cos(hd) * r;\n\n        childSize ??= Size(size.width \/ customLayoutId.length,\n            size.height \/ customLayoutId.length);\n\n        \/\/\/\u8bbe\u7f6e child \u5927\u5c0f\n        layoutChild(item, BoxConstraints.loose(childSize!));\n\n        final double centerX = childSize!.width \/ 2.0;\n\n        final double centerY = childSize!.height \/ 2.0;\n\n        var result = new Offset(x - centerX, y - centerY);\n\n        \/\/\/\u8bbe\u7f6e child \u4f4d\u7f6e\n        positionChild(item, result);\n      }\n    }\n  }\n\n  @override\n  bool shouldRelayout(MultiChildLayoutDelegate oldDelegate) =&gt; false;\n}\n<\/code><\/pre>\n<blockquote><p>\n  \u53c2\u8003\n<\/p><\/blockquote>\n<pre><code class=\"language-dart line-numbers\">import 'dart:math' as math;\n\nimport 'package:flutter\/cupertino.dart';\nimport 'package:flutter\/material.dart';\nimport 'package:flutter\/rendering.dart';\n\n\/\/\/CloudWidget RenderBox\n\/\/\/\u9ed8\u8ba4\u90fd\u4f1a mixins  ContainerRenderObjectMixin \u548c RenderBoxContainerDefaultsMixin\nclass RenderCloudWidget extends RenderBox\n    with\n        ContainerRenderObjectMixin&lt;RenderBox, RenderCloudParentData&gt;,\n        RenderBoxContainerDefaultsMixin&lt;RenderBox, RenderCloudParentData&gt; {\n  RenderCloudWidget({\n    List&lt;RenderBox&gt; children,\n  })  {\n    addAll(children);\n  }\n\n  \/\/\/\u662f\u5426\u91cd\u590d\u533a\u57df\u4e86\n  bool overlaps(RenderCloudParentData data) {\n    Rect rect = data.content;\n    RenderBox child = data.previousSibling;\n\n    if (child == null) {\n      return false;\n    }\n\n    do {\n      RenderCloudParentData childParentData = child.parentData as RenderCloudParentData;\n      if (rect.overlaps(childParentData.content)) {\n        return true;\n      }\n      child = childParentData.previousSibling;\n    } while (child != null);\n    return false;\n  }\n\n  \/\/\/\u8bbe\u7f6e\u4e3a\u6211\u4eec\u7684\u6570\u636e\n  @override\n  void setupParentData(RenderBox child) {\n    if (child.parentData is! RenderCloudParentData)\n      child.parentData = RenderCloudParentData();\n  }\n\n  @override\n  void performLayout() {\n    \/\/\/\u6ca1\u6709 childCount \u4e0d\u73a9\n    if (childCount == 0) {\n      size = constraints.smallest;\n      return;\n    }\n\n    \/\/\/\u521d\u59cb\u5316\u533a\u57df\n    var recordRect = Rect.zero;\n    var previousChildRect = Rect.zero;\n\n    RenderBox child = firstChild;\n\n    while (child != null) {\n      var curIndex = -1;\n      \/\/\/\u63d0\u51fa\u6570\u636e\n      final RenderCloudParentData childParentData = child.parentData as RenderCloudParentData;\n\n      child.layout(constraints, parentUsesSize: true);\n\n      var childSize = child.size;\n\n      \/\/\/\u8bb0\u5f55\u5927\u5c0f\n      childParentData.width = childSize.width;\n      childParentData.height = childSize.height;\n\n      do {\n        ++curIndex;\n\n        \/\/\/\u8bbe\u7f6e\u4e3a\u904f\u5236\n        childParentData.offset = Offset(0, curIndex * 8.toDouble());\n\n        \/\/\/\u5224\u5904\u662f\u5426\u4ea4\u53e0\n      } while (overlaps(childParentData));\n\n      \/\/\/\u8bb0\u5f55\u533a\u57df\n      previousChildRect = childParentData.content;\n      recordRect = recordRect.expandToInclude(previousChildRect);\n\n      \/\/\/\u4e0b\u4e00\u4e2a\n      child = childParentData.nextSibling;\n    }\n\n    \/\/\/\u8c03\u6574\u5e03\u5c40\u5927\u5c0f\n    size = constraints\n        .tighten(\n          height: recordRect.height,\n          width: recordRect.width,\n        )\n        .smallest;\n  }\n\n  \/\/\/\u8bbe\u7f6e\u7ed8\u5236\u9ed8\u8ba4\n  @override\n  void paint(PaintingContext context, Offset offset) {\n    defaultPaint(context, offset);\n  }\n\n  @override\n  double computeDistanceToActualBaseline(TextBaseline baseline) {\n    return defaultComputeDistanceToHighestActualBaseline(baseline);\n  }\n\n  @override\n  bool hitTestChildren(HitTestResult result, { Offset position}) {\n    return defaultHitTestChildren(result as BoxHitTestResult, position: position);\n  }\n}\n\n\/\/\/ CloudParentData\nclass RenderCloudParentData extends ContainerBoxParentData&lt;RenderBox&gt; {\n  double width;\n  double height;\n\n  Rect get content =&gt; Rect.fromLTWH(\n        offset.dx,\n        offset.dy,\n        width,\n        height,\n      );\n}\n\n\nclass CloudWidget extends MultiChildRenderObjectWidget {\n  CloudWidget({\n    Key key,\n    List&lt;Widget&gt; children = const &lt;Widget&gt;[],\n  }) : super(key: key, children: children);\n\n  @override\n  RenderObject createRenderObject(BuildContext context) {\n    return RenderCloudWidget();\n  }\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001\u521d\u6b65\u4f7f\u7528-\u548cSingleChildRenderObjectWidget\u7c7b\u4f3c class CusRender [&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-315","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 - 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