# Extend HeaderBar and OmniBar

You might want to add a button to the workspace header bar. To do this, use an `Ide.WorkspaceAddin` and fetch the header bar using `Ide.Workspace.get_headerbar()`. You can attach your widget to either the left or the right side of the `Ide.OmniBar` in the center of the header bar.

We suggest using `Gio.SimpleAction` to attach an action to the workspace and then activating the action using the `Gtk.Button:action-name` property.

Adding a button to the workspace header bar

    import gi

    from gi.repository import GObject, Ide

    class MyWorkspaceAddin(GObject.Object, Ide.WorkspaceAddin):
        """
        Add a new button to the header bar.
        """

        def do_load(self, workspace: Ide.Workspace):
            headerbar = workspace.get_headerbar()

            # Add button to top-center-left
            self.button = Gtk.Button(label='Click', action_name='win.hello', visible=True)
            headerbar.add_center_left(self.button)

            # Add button to left
            self.button = Gtk.Button(label='Click', action_name='win.hello', visible=True)
            headerbar.add_primary(self.button)

            # Add button to right
            self.button = Gtk.Button(label='Click', action_name='win.hello', visible=True)
            headerbar.add_secondary(self.button)

        def do_unload(self, workspace: Ide.Workspace):
            # remove the button we added
            self.button.destroy()
            self.button = None

    class MyOmniBarAddin(GObject.Object, Ide.OmniBarAddin):
        """
        Extend the omnibar by adding a button inside the bar.
        """

        def do_load(self, omni_bar: Ide.OmniBar):
            self.button = Gtk.Button(visible=True, label='Hi')
            omni_bar.add_status_icon(self.button, 0)

        def do_unload(self, omni_bar: Ide.OmniBar):
            self.button.destroy()
            self.button = None