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gnome-header-bar

AdwHeaderBar layout rules: button placement, flat/icon-only buttons, tooltips, title widgets, split buttons. Use when designing or fixing a GNOME app's header bar.

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Skill: Build a Header Bar

Goal: Construct a compliant GNOME header bar.

Blueprint Template

Adw.HeaderBar {
  centering-policy: strict;
  show-start-title-buttons: false;
  show-end-title-buttons: false;

  title-widget: Adw.WindowTitle {
    title: _("My App");
  };
}

Layout Slots

SlotPositionContent
[start]LeftPrimary actions (New, Open, Back)
title-widgetCenterWindowTitle or ViewSwitcher
[end]RightMenu button, secondary actions

Button Rules

  • All header bar buttons MUST be .flat style (no visible background)
  • All header bar buttons MUST have tooltip-text
  • Icon-only: icon-name="document-new-symbolic"
  • Icon + label: Wrap in GtkBox with spacing
  • Primary menu: icon-name="open-menu-symbolic" on a GtkMenuButton

Blueprint Example (full)

Adw.HeaderBar {
  centering-policy: strict;

  title-widget: Adw.WindowTitle { title: _("My App"); };

  [start]
  Button {
    icon-name: "document-open-symbolic";
    tooltip-text: _("Open");
    styles ["flat"];
    clicked => $on_open_cb(template);
  }

  [start]
  Button {
    icon-name: "tab-new-symbolic";
    tooltip-text: _("New Tab");
    styles ["flat"];
    action-name: "session.new-draft";
  }

  [end]
  MenuButton {
    icon-name: "open-menu-symbolic";
    tooltip-text: _("Main Menu");
    menu-model: primary_menu;
  }
}

Centering Policies

PolicyBehavior
strictTitle strictly centered (Weather)
looseTitle shifts to avoid overlap

Centered Title with Subtitle (Text Editor pattern)

<object class="AdwHeaderBar">
  <property name="title-widget">
    <object class="GtkBox">
      <property name="orientation">vertical</property>
      <property name="valign">center</property>
      <child>
        <object class="GtkCenterBox">
          <child type="start">
            <object class="GtkLabel" id="modified_indicator">
              <property name="label">•</property>
            </object>
          </child>
          <child type="center">
            <object class="GtkLabel" id="title">
              <property name="ellipsize">middle</property>
              <style><class name="title"/></style>
            </object>
          </child>
        </object>
      </child>
      <child>
        <object class="GtkCenterBox">
          <child type="center">
            <object class="GtkLabel" id="subtitle">
              <property name="ellipsize">middle</property>
              <style><class name="subtitle"/></style>
            </object>
          </child>
        </object>
      </child>
    </object>
  </property>
</object>

Real App References

  • gnome-text-editor/src/editor-window.ui
  • gnome-clocks/data/ui/header-bar.ui
  • gnome-weather/data/window.ui

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