Sets the decoration layout for this header bar.
This property overrides the [[email protected]: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 a icon on the left, and minimize, maximize and close buttons on the right.
| this |
a `GtkHeaderBar` |
| layout |
a decoration layout, or null to unset the layout |