Dart APIunself_componentdefaultHeroTag defaultHeroTag top-level constant Null safety HeroTag const defaultHeroTag Implementation const HeroTag defaultHeroTag = HeroTag(null); unself_component unself_component defaultHeroTag constant unself_component library Classes ButtonAction ButtonBackground ButtonElevated ButtonElevation ButtonFilled ButtonForeground ButtonIcon ButtonOutlined ButtonOverlay ButtonText ButtonTonal CardTextEdit CardTextEditState CardTile ChipEmoji ChipText ConditionalParentWidget FloatContainer FloatScaffold HeadingHeadline HeadingSection HeadingTitle HeroTag ListItemBuilder NavigationContext PairingScrollController PairingScrollControllerGroup ResponsiveLayoutBuilder TextArea TextBox TranslucentDecoration UnAppPage UnArtPage UnCard UnCupertinoContextMenu Unmoji UnmojiText UnmojiTextSpan UnRootSheetPage UnScaffold UnselfExtendedSliverNavigationBar UnselfNavigationBar UnselfNavigationBarBackButton UnselfSliverNavigationBar UnSheet UnSliverAppBar UnSliverArtBar Constants defaultHeroTag Properties regex Functions emojiToUnicode loadImageShader show Enums UnmojiFormat Typedefs ContextMenuPreviewBuilder ResponsiveLayoutWidgetBuilder UnTransitionPage