Method activate

plugins/scale/scale.cpp:1297–1356

Activate and start scale animation */

    /* Activate and start scale animation */
    bool activate()
    {
        if (active)
        {
            return false;
        }

        if (!output->activate_plugin(&grab_interface))
        {
            return false;
        }

        auto views = get_views();
        if (views.empty())
        {
            output->deactivate_plugin(&grab_interface);
            return false;
        }

        initial_workspace = output->wset()->get_current_workspace();

        auto active_view = wf::get_active_view_for_output(output);
        if (active_view)
        {
            initial_focus_view = active_view->weak_from_this();
            current_focus_view = toplevel_cast(active_view);
            if (std::find(views.begin(), views.end(), current_focus_view) == views.end())
            {
                current_focus_view = nullptr;
            }
        } else
        {
            initial_focus_view.reset();
            current_focus_view = nullptr;
        }

        // Make sure no leftover events from the activation binding
        // trigger an action in scale
        last_selected_view = nullptr;

        grab->grab_input(wf::scene::layer::WORKSPACE);
        if (current_focus_view != wf::get_core().seat->get_active_view())
        {
            wf::get_core().default_wm->focus_raise_view(current_focus_view);
        }

        active = true;

        layout_slots(get_views());

        output->connect(&on_view_mapped);
        output->connect(&workspace_changed);
        output->connect(&workarea_changed);
        output->connect(&view_minimized);

        fade_out_all_except(current_focus_view);
        fade_in(current_focus_view);