{"id":718,"date":"2023-08-23T10:49:14","date_gmt":"2023-08-23T02:49:14","guid":{"rendered":"https:\/\/iichen.cn\/?p=718"},"modified":"2023-08-23T10:49:14","modified_gmt":"2023-08-23T02:49:14","slug":"flutter-%e6%bb%91%e5%8a%a8%e5%86%b2%e7%aa%81%e5%a4%84%e7%90%86","status":"publish","type":"post","link":"https:\/\/iichen.cn\/?p=718","title":{"rendered":"Flutter-\u6ed1\u52a8\u51b2\u7a81\u5904\u7406"},"content":{"rendered":"<h4>1. \u5b9a\u4e49NotificationListener<\/h4>\n<pre><code class=\"language-dart line-numbers\">Widget wrapWithNotify(Widget child){\n    return NotificationListener&lt;ScrollNotification&gt;(\n        child: child,\n        onNotification: handleNotification,\n    );\n}\n<\/code><\/pre>\n<h4>2. \u5177\u4f53\u5904\u7406<\/h4>\n<pre><code class=\"language-dart line-numbers\">bool handleNotification(ScrollNotification notification){\n    final ScrollMetrics metrics = notification.metrics;\n\n    if(metrics.axis == Axis.horizontal){\n        if(notification is ScrollEndNotification){\n            log('end');\n            \/\/drag = null;\n            dragPosition = null;\n            onEdge = metrics.atEdge;\n            \/\/        if(metrics.atEdge){\n            \/\/          log(' at edge');\n            \/\/          if(drag == null ){\n            \/\/            drag = pageController.position.drag(dragStartDetails, () {\n            \/\/              \/\/drag = null;\n            \/\/            });\n            \/\/            drag.cancel();\n            \/\/          }\n            \/\/        }\n            return true;\n        }\n        if(notification is ScrollStartNotification){\n            log('start');\n            onEdge = metrics.atEdge;\n            if(notification.dragDetails == null) return true;\n            dragStartDetails = notification.dragDetails;\n            return true;\n        }\n        if(notification is ScrollUpdateNotification){\n            onEdge = metrics.atEdge;\n        }\n        if(notification is OverscrollNotification){\n            \/\/        if(notification.dragDetails == null) return true;\n            \/\/        drag.update(notification.dragDetails);\n            log('$onEdge');\n            if(!onEdge) return true;\n            drag = pageController.position.drag(dragStartDetails, () {\n                \/\/drag = null;\n            });\n            onEdge = false;\n        }\n        \/\/\/\u6ed1\u52a8\u5230\u8fb9\u7f18\uff0c\u4f8b\u5982\u6700\u5c0f\u8fb9\u7f18\u65f6\uff0c\u7ee7\u7eed\u5411\u53f3\u6ed1\u52a8\uff0c\u6b64\u65f6\u4e0d\u4f1a\u89e6\u53d1update\n        \/\/\/\u53ea\u4f1a\u89e6\u53d1 start\u548c end\n        \/\/      if(notification is ScrollUpdateNotification){\n        \/\/        log('update');\n        \/\/\/\/        log('after  : ${metrics.extentAfter}');\n        \/\/\/\/        log('before : ${metrics.extentBefore}');\n        \/\/      }\n\n        \/\/      if(notification is UserScrollNotification){\n        \/\/        log('user');\n        \/\/        if(metrics.pixels == metrics.minScrollExtent &amp;&amp; notification.direction == ScrollDirection.forward){\n        \/\/          if(drag == null ){\n        \/\/            drag = pageController.position.drag(dragStartDetails, () {\n        \/\/              drag = null;\n        \/\/            });\n        \/\/          }\n        \/\/\n        \/\/        }else if(metrics.pixels == metrics.maxScrollExtent &amp;&amp; notification.direction == ScrollDirection.reverse){\n        \/\/          if(drag == null ){\n        \/\/            drag = pageController.position.drag(dragStartDetails, () {\n        \/\/              drag = null;\n        \/\/            });\n        \/\/          }\n        \/\/        }\n        \/\/\n        \/\/      }\n    }\n    return true;\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>1. \u5b9a\u4e49NotificationListener Widget wrapWithNotify(Widget  [&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-718","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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