Flutter 核心原理之Widget、Element、RenderObject1
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2022-08-03
20:53:41
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markNeedsLayout()
markNeedsPaint()
true
Flutter
RenderObject
layout
paint
RenderBox
Widget
RenderObjectWidget
AbstractNode
render 1
render 2 render 3
render 4 render 5
render 6
render tree
RenderView
….
RenderObjectWidget
LeafRenderObjectWidget SingleChildRenderObjectWidget MultiChildRenderObjectWidget
Widget
StatelessWidget InheritedWidgetStatefulWidget
Element
StatelessElement
Widget
StatefulElement
Widget
LeafRender
ObjectElement
mounted()
initState
didUpdateWidget()
setState()
deactivate
build()
didChangeDependencies()
dispose()
State
Element
Widget 2
…
…
Widget 3
Widget 4
InheritedWidget inheritedWidget =
BuildContext.inheritFromWidgetOfExactType();
InheritedWidget
Widget 1
RenderObject
createElement()
createRenderObject()
updateRenderObject()
SingleChildRender
ObjectElement
MultiChildRender
ObjectElement
ComponentElement InheritedElement
Element
Element 1
Element 2 Element 3
Element 4 Element 5
Element 6
Element 8
Element 7
Element 9
XRenderObjectWidget
XXRenderObjectWidget
XXXRenderObjectWidget
XRender
ObjectElement
XXRender
ObjectElement
XXXRender
ObjectElement
BuildOwner
_parent
visitChildren
performRebuild
rebuild
markNeedsBuild
updateChild
_slot
Element 1
Element 2
Element 3
ComponentElement
StatefulElement
build _firstBuild deactivate unmount
didChangeDependencies
InheritedElement
Map<Element>
Element
mount
update()
performRebuild()
unmount()
RenderObjectElement
Flutter WidgetElementRenderObject
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(wx: gdky005)
李诗旸
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