gtk.header_bar.HeaderBar is similar to a horizontal gtk.center_box.CenterBox. It allows
children to be placed at the start or the end. In addition, it allows
the window title to be displayed. The title will be centered with respect
to the width of the box, even if the children at either side take up
different amounts of space.
gtk.header_bar.HeaderBar can add typical window frame controls, such as minimize,
maximize and close buttons, or the window icon.
The gtk.header_bar.HeaderBar implementation of the gtk.buildable.Buildable interface supports
adding children at the start or end sides by specifying “start” or “end” as
the “type” attribute of a <child> element, or setting the title widget by
specifying “title” value.
By default the gtk.header_bar.HeaderBar uses a gtk.label.Label displaying the title of the
window it is contained in as the title widget, equivalent to the following
UI definition:
A gtk.header_bar.HeaderBar's CSS node is called headerbar. It contains a windowhandle
subnode, which contains a box subnode, which contains two box subnodes at
the start and end of the header bar, as well as a center node that represents
the title.
gtk.header_bar.HeaderBar is a widget for creating custom title bars for windows.
gtk.header_bar.HeaderBar is similar to a horizontal gtk.center_box.CenterBox. It allows children to be placed at the start or the end. In addition, it allows the window title to be displayed. The title will be centered with respect to the width of the box, even if the children at either side take up different amounts of space.
gtk.header_bar.HeaderBar can add typical window frame controls, such as minimize, maximize and close buttons, or the window icon.
For these reasons, gtk.header_bar.HeaderBar is the natural choice for use as the custom titlebar widget of a gtk.window.Window (see gtk.window.Window.setTitlebar), as it gives features typical of titlebars while allowing the addition of child widgets.
GtkHeaderBar as GtkBuildable
The gtk.header_bar.HeaderBar implementation of the gtk.buildable.Buildable interface supports adding children at the start or end sides by specifying “start” or “end” as the “type” attribute of a <child> element, or setting the title widget by specifying “title” value.
By default the gtk.header_bar.HeaderBar uses a gtk.label.Label displaying the title of the window it is contained in as the title widget, equivalent to the following UI definition:
CSS nodes
A gtk.header_bar.HeaderBar's CSS node is called headerbar. It contains a windowhandle subnode, which contains a box subnode, which contains two box subnodes at the start and end of the header bar, as well as a center node that represents the title.
Each of the boxes contains a windowcontrols subnode, see gtk.window_controls.WindowControls for details, as well as other children.
Accessibility
gtk.header_bar.HeaderBar uses the gtk.types.AccessibleRole.Group role.