动画容器:RenderFlex 底部溢出 154 像素 [英] Animated container : RenderFlex overflowed by 154 pixels on the bottom
问题描述
在设置不同的内容高度时调整动画容器的大小时遇到问题.
I have a problem when resizing an animated container while setting different content height.
调整大小时抛出异常:
════════ 渲染库捕获的异常════════
════════ Exception caught by rendering library ════════
在布局期间抛出了以下断言:
The following assertion was thrown during layout:
一个 RenderFlex 在底部溢出了 154 个像素.
A RenderFlex overflowed by 154 pixels on the bottom.
这是一个重现问题的最小示例(在我的真实应用中要复杂得多,但你明白了):
Here is a minimal example to reproduce the problem (much more complex in my real app but you get the point) :
bool expanded;
initState() {
super.initState();
expanded = false;
}
void _toggleMode() {
setState(() {
expanded = !expanded;
});
}
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text("Test")),
body: AnimatedContainer(
height: expanded ? 230 : 70,
duration: Duration(milliseconds: 800),
child: Column(
children: <Widget>[
Expanded(
child: PageView.builder(
itemBuilder: (context, position) {
return expanded
? Column(
children: <Widget>[
Container(height: 40, color: Colors.blue),
Container(height: 40, color: Colors.blue[400]),
Container(height: 40, color: Colors.blue[300]),
Container(height: 40, color: Colors.blue[200]),
Container(height: 40, color: Colors.blue[100]),
],
)
: Column(
children: <Widget>[
Container(height: 40, color: Colors.blue),
],
);
},
),
),
InkWell(onTap: _toggleMode, child: expanded ? Icon(Icons.keyboard_arrow_up) : Icon(Icons.keyboard_arrow_down))
],
),
),
);
}
在两种模式下(扩展或不扩展),内容都适合容器(没有溢出),问题只在调整大小时出现.
In both mode (expanded or not), the content fits the container (no overflow), problem appears only during resizing.
当然,没有动画的基本容器不会出现问题.
Of course problem does not happen with a basic container without animation.
我该如何处理?
推荐答案
发生这种情况是因为您检查了是否展开,然后在容器达到最终大小之前立即返回容器
This happening because you check for expanded and then immediately return the containers before the container takes its final size
一种解决方法将使用 NeverScrollableScrollPhysics()
用 ListView 更改更大的列
A workaround will be to change the bigger column with a ListView with NeverScrollableScrollPhysics()
你甚至不需要再检查展开了,你会得到正确的动画
you don't even need to check for expanded any more and you will get the correct animation
bool expanded;
initState() {
super.initState();
expanded = false;
}
void _toggleMode() {
setState(() {
expanded = !expanded;
});
}
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text("Test")),
body: AnimatedContainer(
height: expanded ? 230 : 70,
duration: Duration(milliseconds: 800),
child: Column(
children: <Widget>[
Expanded(
child: PageView.builder(
itemBuilder: (context, position) {
return ListView(
physics: NeverScrollableScrollPhysics(),
children: <Widget>[
Column(
children: <Widget>[
Container(height: 40, color: Colors.blue),
Container(height: 40, color: Colors.blue[400]),
Container(height: 40, color: Colors.blue[300]),
Container(height: 40, color: Colors.blue[200]),
Container(height: 40, color: Colors.blue[100]),
],
),
],
);
// : Column(
// children: <Widget>[
// Container(height: 40, color: Colors.blue),
// ],
// );
},
),
),
InkWell(onTap: _toggleMode, child: expanded ? Icon(Icons.keyboard_arrow_up) : Icon(Icons.keyboard_arrow_down))
],
),
),
);
}
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