Sidebar layouts: AdwNavigationSplitView vs OverlaySplitView, sidebar widths, collapse breakpoints, navigation-sidebar styling. Use when adding a sidebar or master-detail layout to a GNOME app.
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<object class="Adw.NavigationSplitView" id="split_view">
<property name="collapsed">false</property>
<property name="sidebar">
<object class="Adw.NavigationPage">
<property name="title" translatable="yes">Locations</property>
<property name="child">
<!-- sidebar content: list of items -->
</property>
</object>
</property>
<property name="content">
<object class="Adw.NavigationView">
<!-- content pages -->
</object>
</property>
</object>
<object class="Adw.OverlaySplitView" id="split_view">
<property name="sidebar-position">end</property>
<property name="show-sidebar">false</property>
<property name="min-sidebar-width">350</property>
<property name="content">
<!-- main content -->
</property>
<property name="sidebar">
<!-- properties panel -->
</property>
</object>
Toggle with a button:
<object class="Gtk.ToggleButton" id="properties_button">
<property name="active" bind-source="split_view" bind-property="show-sidebar" bind-flags="bidirectional|sync-create"/>
<property name="icon-name">info-outline-symbolic</property>
<property name="tooltip-text" translatable="yes">Document Properties</property>
</object>
| Pattern | When |
|---|---|
AdwNavigationSplitView | Permanent sidebar, many locations, dynamic lists |
AdwOverlaySplitView | Toggleable properties panel, slides over content |
AdwFlap | Foldable sidebar, adaptive collapse |
For narrow screens, replace AdwOverlaySplitView with AdwBottomSheet:
<object class="Adw.BottomSheet">
<property name="open" bind-source="toggle_btn" bind-property="active" bind-flags="bidirectional|sync-create"/>
<property name="content"><!-- main --></property>
<property name="sheet"><!-- sidebar content --></property>
</object>
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Add a standard AdwAboutDialog wired to app metadata, plus the AppStream metainfo file it should share data with. Use when adding an About entry, release notes, credits, or preparing app metadata.
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Make a GTK4/libadwaita app accessible — accessible labels and roles, tooltips on icon-only buttons, keyboard navigation, contrast, and testing with Orca/Accerciser. Use when fixing a11y issues or running the accessibility category of a HIG audit.
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Responsive GNOME layouts: AdwBreakpoint conditions, BreakpointBin, MultiLayoutView, BottomSheet, narrow/wide layout swaps. Use when making an app work on phones or narrow windows.
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Onboarding tour with AdwCarousel and navigation dots, skippable welcome screens. Use when adding a first-run tour or feature showcase to a GNOME app.
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Implement GNOME's 4-tier destructive-action pattern: undo toasts instead of confirmation dialogs, AdwAlertDialog for irreversible actions. Use when adding delete, remove, clear, or other destructive actions.
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Loading, empty, and error states with AdwStatusPage and AdwSpinner — placeholder icons, titles, action buttons. Use when an app view can be empty, loading, or failed.
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