{"id":692,"date":"2023-06-21T16:02:51","date_gmt":"2023-06-21T08:02:51","guid":{"rendered":"https:\/\/iichen.cn\/?p=692"},"modified":"2023-06-21T16:02:51","modified_gmt":"2023-06-21T08:02:51","slug":"flutter-%e5%8c%85%e5%90%abfactor%e5%b1%9e%e6%80%a7%e7%9a%84widget%e5%ba%94%e7%94%a8","status":"publish","type":"post","link":"https:\/\/iichen.cn\/?p=692","title":{"rendered":"Flutter-\u5c3a\u5bf8\u9650\u5236\u7c7b\u5e94\u7528"},"content":{"rendered":"<h4>1. FractionallySizedBox<\/h4>\n<blockquote><p>\n  \u901a\u8fc7\u66f4\u6539width\/heightFactor\u6765\u5b9e\u73b0\u7c7b\u4f3c\u6eda\u52a8\u8fdb\u5ea6\u6761\n<\/p><\/blockquote>\n<pre><code class=\"language-dart line-numbers\">Row(\n    children: [\n      Flexible(\n        child: FractionallySizedBox(\n          widthFactor: 1.0,\n          child: Container(\n            width: 20,\n            height: 20,\n            color: Colors.red,\n          ),\n        ),\n      ),\n      Container(\n        width: 20,\n        height: 20,\n        color: Colors.blueAccent,\n      )\n    ],\n)\n<\/code><\/pre>\n<h4>2. Align<\/h4>\n<blockquote><p>\n  \u7c7b\u4f3c\u6298\u53e0\u5c55\u5f00\u9762\u677f\n<\/p><\/blockquote>\n<pre><code class=\"language-dart line-numbers\">ClipRect(\n    child: AnimatedBuilder(\n      builder: (BuildContext context, Widget? child) {\n        return Align(\n              alignment: Alignment.center,\n              heightFactor: _heightFactorMyopia.value,\n              child: Text(\"\");\n        );\n      },\n      animation: _heightFactorMyopia,\n    ),\n)\n<\/code><\/pre>\n<h4>3. Position<\/h4>\n<pre><code class=\"language-dart line-numbers\">class MyHomePage extends StatefulWidget {\n  const MyHomePage({Key? key, required this.title}) : super(key: key);\n  final String title;\n\n  @override\n  State&lt;MyHomePage&gt; createState() =&gt; _MyHomePageState();\n}\n\nclass _MyHomePageState extends State&lt;MyHomePage&gt; with TickerProviderStateMixin{\n  late AnimationController _animationController;\n  late Animation&lt;Offset&gt; _animation;\n\n  @override\n  void initState() {\n    super.initState();\n    _animationController =\n        AnimationController(duration: const Duration(seconds: 2), vsync: this);\n\n      \/\/ \u521d\u59cb\u5316\u5c06\u5176\u79fb\u52a8\u5230\u5c4f\u5e55\u5916 \uff0c\u4e0d\u52a0\u52a8\u753b\u9ed8\u8ba4\u5c31\u662f\u53f3\u4fa7\u4e00\u4e2a widthFactor\u5927\u5c0f\u663e\u793a\n    _animation = Tween(begin: const Offset(1.0,0.0), end: const Offset(0.0,0.0)).animate(_animationController);\n  }\n\n  @override\n  void dispose() {\n    super.dispose();\n    _animationController.dispose();\n  }\n\n  @override\n  Widget build(BuildContext context) {\n    return Scaffold(\n      appBar: AppBar(\n        title: Text(widget.title),\n      ),\n      floatingActionButton: FloatingActionButton(onPressed: () {\n        _animationController.forward();\n      }),\n      body: GestureDetector(\n        onHorizontalDragStart: (detail) {\n\n        },\n        onHorizontalDragUpdate: (detail) {\n\n        },\n        onHorizontalDragEnd: (detail) {\n\n        },\n        child: SizedBox(\n          width: double.infinity,\n          height: 50,\n          child: Stack(\n            children: [\n              Container(\n                color: Colors.black12,\n                width: double.infinity,\n              ),\n              Positioned.fill(\n                child: ClipRect(\n                  \/\/ \u52a8\u6001\u6539\u53d8\u88c1\u5207\u6bd4\u4f8b\n                  clipper: _SlidableClipper(animation: _animation),\n                  \/\/ \u5360\u6ee1\u5bbd\u5ea6\u540e \u6307\u5b9a widthFactor \u5e76\u4e14\u901a\u8fc7alignment \u4e3a\u53f3\u4fa7\n                  \/\/ \u8fd9\u6837\u6700\u7ec8\u663e\u793a\u53f3\u4fa7 \u5927\u5c0f\u662f widthFactor\n                  child: FractionallySizedBox(\n                    alignment: const Alignment(1,0),\n                    widthFactor: 0.15,\n                    child: SlideTransition(\n                      position: _animation,\n                      child: Flex(\n                        direction: Axis.horizontal,\n                        children: [\n                          Container(\n                            color: Colors.pink,\n                            width: 50,\n                            height: 50,\n                            child: const Center(child: Text(\"\u5220\u9664\",style: TextStyle(\n                              color: Colors.white\n                            ),)),\n                          )\n                        ],\n                      ),\n                    ),\n                  ),\n                ),\n              )\n            ],\n          ),\n        ),\n      ),\n    );\n  }\n}\n\nclass _SlidableClipper extends CustomClipper&lt;Rect&gt; {\n  _SlidableClipper() : super();\n\n  @override\n  Rect getClip(Size size) {\n    \/\/ \u4e0e\u4e0a\u9762\u7684widthFactor \u76f8\u5173 ratio = 1 - widthFactor\n    final double offset = 1.0 * size.width;\n    \/\/ \u4ece\u5de6\u5f80\u53f3\u6ed1\u52a8 -0.0 ~ -(1 - widthFactor)\n    if (offset &lt; 0) {\n      return Rect.fromLTRB(size.width + offset, 0, size.width, size.height);\n    }\n    \/\/ \u4ece\u53f3\u5f80\u5de6\u6ed1\u52a8 (1 - widthFactor) ~ 1.0\n    return Rect.fromLTRB(0, 0, offset, size.height);\n  }\n\n  @override\n  Rect getApproximateClipRect(Size size) =&gt; getClip(size);\n\n  @override\n  bool shouldReclip(_SlidableClipper oldClipper) {\n    return true;\n  }\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>1. FractionallySizedBox \u901a\u8fc7\u66f4\u6539width\/heightFactor\u6765\u5b9e\u73b0\u7c7b\u4f3c\u6eda\u52a8\u8fdb\u5ea6 [&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-692","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-\u5c3a\u5bf8\u9650\u5236\u7c7b\u5e94\u7528 - IIchen<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/iichen.cn\/?p=692\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Flutter-\u5c3a\u5bf8\u9650\u5236\u7c7b\u5e94\u7528 - IIchen\" \/>\n<meta property=\"og:description\" content=\"1. 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