Flutter 颤振-固定高度内的单视图
我正在制作一个分割视图小部件,它可以通过拖动底部小部件来调整它们的比率。 问题是,我想在底部放置一些大的小部件,以便在扩展它时可以完全看到它,如果不扩展,只能看到部分 这是我的分割视图代码Flutter 颤振-固定高度内的单视图,flutter,height,fixed,singlechildscrollview,Flutter,Height,Fixed,Singlechildscrollview,我正在制作一个分割视图小部件,它可以通过拖动底部小部件来调整它们的比率。 问题是,我想在底部放置一些大的小部件,以便在扩展它时可以完全看到它,如果不扩展,只能看到部分 这是我的分割视图代码 class HorizontalSplitView extends StatefulWidget { final Widget top; final Widget bottom; final double ratio; const HorizontalSplitView( {Key
class HorizontalSplitView extends StatefulWidget {
final Widget top;
final Widget bottom;
final double ratio;
const HorizontalSplitView(
{Key key, @required this.top, @required this.bottom, this.ratio = 0.2})
: super(key: key);
@override
_HorizontalSplitViewState createState() => _HorizontalSplitViewState();
}
class _HorizontalSplitViewState extends State<HorizontalSplitView> {
double _ratio;
double _maxHeight;
get _height1 => _ratio * _maxHeight;
get _height2 => (1 - _ratio) * _maxHeight;
@override
void initState() {
super.initState();
_ratio = widget.ratio;
}
@override
Widget build(BuildContext context) {
return LayoutBuilder(builder: (context, BoxConstraints constraints) {
_maxHeight = constraints.maxHeight;
return SizedBox(
height: constraints.maxHeight,
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
SizedBox(
height: _height1,
child: widget.top,
),
GestureDetector(
behavior: HitTestBehavior.translucent,
onPanUpdate: (DragUpdateDetails details) {
setState(() {
_ratio += details.delta.dy / _maxHeight;
if (_ratio > 0.85)
_ratio = 0.85;
else if (_ratio < 0.0) _ratio = 0.0;
});
},
onPanEnd: (DragEndDetails details) {
setState(() {
if (_ratio < 0.5)
_ratio = 0.0;
else if (0.6 <= _ratio && _ratio < 0.8)
_ratio = 0.6;
else if (0.8 < _ratio) _ratio = 0.85;
});
},
child: SizedBox(
height: _height2,
child: widget.bottom,
),
),
],
),
);
});
}
}
类HorizontalSplitView扩展StatefulWidget{
最终小部件顶部;
最终小部件底部;
最终倍率;
常量水平拆分视图(
{Key Key,@required this.top,@required this.bottom,this.ratio=0.2})
:super(key:key);
@凌驾
_HorizontalSplitViewState createState()=>\u HorizontalSplitViewState();
}
类_HorizontalSplitViewState扩展状态{
双u比;
双倍最大高度;
获取_height1=>_ratio*_maxHeight;
获取_高度2=>(1-_比率)*\u最大高度;
@凌驾
void initState(){
super.initState();
_ratio=widget.ratio;
}
@凌驾
小部件构建(构建上下文){
返回LayoutBuilder(生成器:(上下文,框约束){
_maxHeight=constraints.maxHeight;
返回大小框(
高度:constraints.maxHeight,
子:列(
crossAxisAlignment:crossAxisAlignment.stretch,
儿童:[
大小盒子(
高度:_高度1,
child:widget.top,
),
手势检测器(
行为:HitTestBehavior.transparent,
onPanUpdate:(DragUpdate详细信息){
设置状态(){
_比率+=details.delta.dy/_最大高度;
如果(_比率>0.85)
_比率=0.85;
否则,如果(_比率<0.0)_比率=0.0;
});
},
onPanEnd:(绘图详细信息){
设置状态(){
如果(_比率<0.5)
_比率=0.0;
否则如果(0.6你也可以这样做
Column(
children: [
Container(
height: 200,
color: Colors.orange,
),
Expanded(
child: SingleChildScrollView(
scrollDirection: Axis.vertical,
child: Container(
color: Colors.green,
),
),
)
],
)
你也可以这样做
Column(
children: [
Container(
height: 200,
color: Colors.orange,
),
Expanded(
child: SingleChildScrollView(
scrollDirection: Axis.vertical,
child: Container(
color: Colors.green,
),
),
)
],
)
如下图所示,通过改变布局来解决
@override
Widget build(BuildContext context) {
return LayoutBuilder(builder: (context, BoxConstraints constraints) {
_maxHeight = constraints.maxHeight;
return Scaffold(
//appBar: NavigationBar(appBarKey, searchFocus),
body: Stack(alignment: Alignment.bottomCenter, children: <Widget>[
Padding(
padding: const EdgeInsets.all(8.0),
child: Align(
alignment: Alignment.topCenter,
child: Container(
height: (_maxHeight - _offset.dy - 10.0) < (_maxHeight / 2)
? _maxHeight / 2
: _maxHeight - _offset.dy - 10.0,
decoration: BoxDecoration(
color: Colors.orange,
border: Border.all(color: Colors.black),
),
child: Center(
child: Text('top'),
)),
),
),
GestureDetector(
onPanUpdate: (details) {
_offset = Offset(0, _offset.dy - details.delta.dy);
if (_offset.dy < _minHeight) {
_offset = Offset(0, _minHeight);
} else if (_offset.dy > _maxHeight) {
_offset = Offset(0, _maxHeight);
}
setState(() {});
},
onPanEnd: (DragEndDetails details) {
if (_offset.dy < _minHeight) {
_offset = Offset(0, _minHeight);
} else if (_minHeight<_offset.dy && _offset.dy<_maxHeight/2){
_offset = Offset(0, _maxHeight/2);
} else if (_offset.dy > _maxHeight/2) {
_offset = Offset(0, _maxHeight);
}
setState(() {});
},
child: AnimatedContainer(
duration: Duration.zero,
curve: Curves.easeOut,
height: _offset.dy,
alignment: Alignment.center,
child: SingleChildScrollView(
physics: NeverScrollableScrollPhysics(),
child: ConstrainedBox(
constraints: BoxConstraints(
minHeight: _offset.dy,
),
child: IntrinsicHeight(
child: Column(
children: [
Container(
// A fixed-height child.
color: Colors.black,
height: 120.0,
),
Expanded(
child: Container(
color: Colors.blue,
height: 300.0,
),
),
Container(
// A fixed-height child.
color: Colors.yellow,
height: 120.0,
),
],
),
)),
),
),
),
]),
);
});
}
@覆盖
小部件构建(构建上下文){
返回LayoutBuilder(生成器:(上下文,框约束){
_maxHeight=constraints.maxHeight;
返回脚手架(
//appBar:NavigationBar(appBarKey,searchFocus),
主体:堆栈(对齐方式:alignment.bottomCenter,子对象:[
填充物(
填充:常数边集全部(8.0),
子对象:对齐(
对齐:alignment.topCenter,
子:容器(
高度:(_maxHeight-_offset.dy-10.0)<(_maxHeight/2)
?_最大高度/2
:_maxHeight-_offset.dy-10.0,
装饰:盒子装饰(
颜色:颜色。橙色,
边框:边框。全部(颜色:颜色。黑色),
),
儿童:中心(
子项:文本('top'),
)),
),
),
手势检测器(
onPanUpdate:(详细信息){
_偏移量=偏移量(0,_offset.dy-details.delta.dy);
如果(_offset.dy<_minHeight){
_偏移=偏移(0,最小高度);
}否则如果(\u offset.dy>\u maxHeight){
_偏移量=偏移量(0,_最大高度);
}
setState((){});
},
onPanEnd:(绘图详细信息){
如果(_offset.dy<_minHeight){
_偏移=偏移(0,最小高度);
}否则,如果(_minHeight通过更改堆栈布局解决,如下所示
@override
Widget build(BuildContext context) {
return LayoutBuilder(builder: (context, BoxConstraints constraints) {
_maxHeight = constraints.maxHeight;
return Scaffold(
//appBar: NavigationBar(appBarKey, searchFocus),
body: Stack(alignment: Alignment.bottomCenter, children: <Widget>[
Padding(
padding: const EdgeInsets.all(8.0),
child: Align(
alignment: Alignment.topCenter,
child: Container(
height: (_maxHeight - _offset.dy - 10.0) < (_maxHeight / 2)
? _maxHeight / 2
: _maxHeight - _offset.dy - 10.0,
decoration: BoxDecoration(
color: Colors.orange,
border: Border.all(color: Colors.black),
),
child: Center(
child: Text('top'),
)),
),
),
GestureDetector(
onPanUpdate: (details) {
_offset = Offset(0, _offset.dy - details.delta.dy);
if (_offset.dy < _minHeight) {
_offset = Offset(0, _minHeight);
} else if (_offset.dy > _maxHeight) {
_offset = Offset(0, _maxHeight);
}
setState(() {});
},
onPanEnd: (DragEndDetails details) {
if (_offset.dy < _minHeight) {
_offset = Offset(0, _minHeight);
} else if (_minHeight<_offset.dy && _offset.dy<_maxHeight/2){
_offset = Offset(0, _maxHeight/2);
} else if (_offset.dy > _maxHeight/2) {
_offset = Offset(0, _maxHeight);
}
setState(() {});
},
child: AnimatedContainer(
duration: Duration.zero,
curve: Curves.easeOut,
height: _offset.dy,
alignment: Alignment.center,
child: SingleChildScrollView(
physics: NeverScrollableScrollPhysics(),
child: ConstrainedBox(
constraints: BoxConstraints(
minHeight: _offset.dy,
),
child: IntrinsicHeight(
child: Column(
children: [
Container(
// A fixed-height child.
color: Colors.black,
height: 120.0,
),
Expanded(
child: Container(
color: Colors.blue,
height: 300.0,
),
),
Container(
// A fixed-height child.
color: Colors.yellow,
height: 120.0,
),
],
),
)),
),
),
),
]),
);
});
}
@覆盖
小部件构建(构建上下文){
返回LayoutBuilder(生成器:(上下文,框约束){
_maxHeight=constraints.maxHeight;
返回脚手架(
//appBar:NavigationBar(appBarKey,searchFocus),
主体:堆栈(对齐方式:alignment.bottomCenter,子对象:[
填充物(
填充:常数边集全部(8.0),
子对象:对齐(
对齐:alignment.topCenter,
子:容器(
高度:(_maxHeight-_offset.dy-10.0)<(_maxHeight/2)
?_最大高度/2
:_maxHeight-_offset.dy-10.0,
装饰:盒子装饰(
颜色:颜色。橙色,
边框:边框。全部(颜色:颜色。黑色),
),
儿童:中心(
子项:文本('top'),
)),
),
),
手势检测器(
onPanUpdate:(详细信息){
_偏移量=偏移量(0,_offset.dy-details.delta.dy);
如果(_offset.dy<_minHeight){
_偏移=偏移(0,最小高度);
}否则如果(\u offset.dy>\u maxHeight){
_偏移量=偏移量(0,_最大高度);
}
setState((){});
},
onPanEnd:(绘图详细信息){
如果(_offset.dy<_minHeight){
_偏移=偏移(0,最小高度);
}否则,如果(_minheights)这样,就不可能调整橙色和绿色小部件的大小。这样,就不可能调整橙色和绿色小部件的大小。