1.新增globalKey
final GlobalKey globalKey=GlobalKey();
2,需要监控的widget的key设置成新增的globalkey
ListView(
controller:_controller
children: [
Container(height:200,width: double.infinity,color: Colors.red,),
Container(height:200,width: double.infinity,color: Colors.yellow,),
Container(height:200,width: double.infinity,color: Colors.blue,),
Container(
key:globalKey,
height:200,width: double.infinity,color: Colors.pink,
),
Container(height:200,width: double.infinity,color: Colors.cyan,),
],
)
3,获取widget相对于当前页面显示状态下的位置
//获取position
RenderBox box =globalKey.currentContext.findRenderObject();
Offset offset = box.localToGlobal(Offset.zero);
//获取size
Size size = box.size;
Size size =globalKey.currentContext.size;
4,获取的Widget高度包含状态栏和appbar高度以及ListVIew的offset,计算所要滚动到的位置并使用_controller滚动到指定位置
_scrollToWidget(){
RenderBox box =globalKey.currentContext.findRenderObject();
Offset offset = box.localToGlobal(Offset.zero);
double animatHeight =0.0;
if(offset.dy ==MediaQueryData.fromWindow(window).padding.top +56.0)return;
animatHeight =_controller.offset + offset.dy -MediaQueryData.fromWindow(window).padding.top -56.0;
_controller.animateTo(animatHeight, duration:Duration(milliseconds:500), curve: Curves.decelerate);
}
