layout: post title: “2019-12-22-Flutter Widget.markdown” date: 2019-12-22 12:11:30 +0800

  1. StatelessWidget 对RenderObjectWidget和StatefulWidget的简单封装. 1) Container 将一个Widget分解成多个串联的Widget, Align/Padding/LimitedBox 2) GestureDetector RawGestureDetector的封装 3) SingleChildScrollView _SingleChildViewport,Scrollable,
  2. StatefulWidget 拥有更多生命周期,通过更新来提高效率,由于会对包含的Widget造成影响,应该 将Widget尽量放低
  3. RenderObjectWidget RenderPositionedBox createRenderObject(BuildContext context) void updateRenderObject(BuildContext context, RenderPositionedBox renderObject) SingleChildRenderObjectWidget Align // 使用performLayout(),修饰child的位置和尺寸

// TODO 关系

RenderObject //layout