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Display and style text Text: StatelessWidgetRichText : LeafRenderObjectW...
Single-child layout widgets:{ContainerPaddingCenterAlignFittedBoxAspectR...
Basic Widgets: {ContainerRowColumnImageTextIconRaisedButtonScaffoldAppba...
对应关系:View - Widget 区别:StatefulWidget 有状态 StateStatelessWidget 无状态