Struct gtk4::HeaderBar

source ·
#[repr(transparent)]
pub struct HeaderBar { /* private fields */ }
Expand description

HeaderBar is a widget for creating custom title bars for windows.

An example GtkHeaderBar

HeaderBar is similar to a horizontal 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.

HeaderBar can add typical window frame controls, such as minimize, maximize and close buttons, or the window icon.

For these reasons, HeaderBar is the natural choice for use as the custom titlebar widget of a Window (see GtkWindowExt::set_titlebar()), as it gives features typical of titlebars while allowing the addition of child widgets.

GtkHeaderBar as GtkBuildable

The HeaderBar implementation of the Buildable interface supports adding children at the start or end sides by specifying “start” or “end” as the “type” attribute of a element, or setting the title widget by specifying “title” value.

By default the HeaderBar uses a Label displaying the title of the window it is contained in as the title widget, equivalent to the following UI definition:

<object class="GtkHeaderBar">
  <property name="title-widget">
    <object class="GtkLabel">
      <property name="label" translatable="yes">Label</property>
      <property name="single-line-mode">True</property>
      <property name="ellipsize">end</property>
      <property name="width-chars">5</property>
      <style>
        <class name="title"/>
      </style>
    </object>
  </property>
</object>

CSS nodes

headerbar
╰── windowhandle
    ╰── box
        ├── box.start
        │   ├── windowcontrols.start
        │   ╰── [other children]
        ├── [Title Widget]
        ╰── box.end
            ├── [other children]
            ╰── windowcontrols.end

A 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 WindowControls for details, as well as other children.

Accessibility

HeaderBar uses the AccessibleRole::Group role.

Implements

WidgetExt, glib::ObjectExt, AccessibleExt, BuildableExt, ConstraintTargetExt, WidgetExtManual, AccessibleExtManual

Implementations§

Creates a new HeaderBar widget.

Returns

a new HeaderBar

Creates a new builder-pattern struct instance to construct HeaderBar objects.

This method returns an instance of HeaderBarBuilder which can be used to create HeaderBar objects.

Gets the decoration layout of the HeaderBar.

Returns

the decoration layout

Returns whether this header bar shows the standard window title buttons.

Returns

true if title buttons are shown

Retrieves the title widget of the header.

See set_title_widget().

Returns

the title widget of the header

Adds @child to @self, packed with reference to the end of the @self.

child

the Widget to be added to @self

Adds @child to @self, packed with reference to the start of the @self.

child

the Widget to be added to @self

Removes a child from the HeaderBar.

The child must have been added with pack_start(), pack_end() or set_title_widget().

child

the child to remove

Sets the decoration layout for this header bar.

This property overrides the property::Settings::gtk-decoration-layout setting.

There can be valid reasons for overriding the setting, such as a header bar design that does not allow for buttons to take room on the right, or only offers room for a single close button. Split header bars are another example for overriding the setting.

The format of the string is button names, separated by commas. A colon separates the buttons that should appear on the left from those on the right. Recognized button names are minimize, maximize, close and icon (the window icon).

For example, “icon:minimize,maximize,close” specifies an icon on the left, and minimize, maximize and close buttons on the right.

layout

a decoration layout, or None to unset the layout

Sets whether this header bar shows the standard window title buttons.

setting

true to show standard title buttons

Sets the title for the HeaderBar.

When set to None, the headerbar will display the title of the window it is contained in.

The title should help a user identify the current view. To achieve the same style as the builtin title, use the “title” style class.

You should set the title widget to None, for the window title label to be visible again.

title_widget

a widget to use for a title

Trait Implementations§

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Auto Trait Implementations§

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