compositor: add vmethod to override inhibit shortcut dialog

A MetaPlugin implementation of the MetaInhibitShortcutsDialog can be
used in place of the default inhibit shortcut.

https://bugzilla.gnome.org/show_bug.cgi?id=783342

src/compositor/compositor-private.h

@@ -65,4 +65,7 @@ void meta_compositor_flash_window (MetaCompositor *compositor,
 MetaCloseDialog * meta_compositor_create_close_dialog (MetaCompositor *compositor,
                                                        MetaWindow     *window);
 
+MetaInhibitShortcutsDialog * meta_compositor_create_inhibit_shortcuts_dialog (MetaCompositor *compositor,
+                                                                              MetaWindow     *window);
+
 #endif /* META_COMPOSITOR_PRIVATE_H */

src/compositor/compositor.c

@@ -1422,3 +1422,11 @@ meta_compositor_create_close_dialog (MetaCompositor *compositor,
   return meta_plugin_manager_create_close_dialog (compositor->plugin_mgr,
                                                   window);
 }
+
+MetaInhibitShortcutsDialog *
+meta_compositor_create_inhibit_shortcuts_dialog (MetaCompositor *compositor,
+                                                 MetaWindow     *window)
+{
+  return meta_plugin_manager_create_inhibit_shortcuts_dialog (compositor->plugin_mgr,
+                                                              window);
+}

src/compositor/meta-plugin-manager.c

@@ -28,6 +28,7 @@
 #include "meta-module.h"
 #include "window-private.h"
 #include "meta-close-dialog-default-private.h"
+#include "meta-inhibit-shortcuts-dialog-default-private.h"
 
 #include <string.h>
 #include <stdlib.h>
@@ -390,3 +391,16 @@ meta_plugin_manager_create_close_dialog (MetaPluginManager *plugin_mgr,
 
   return meta_close_dialog_default_new (window);
 }
+
+MetaInhibitShortcutsDialog *
+meta_plugin_manager_create_inhibit_shortcuts_dialog (MetaPluginManager *plugin_mgr,
+                                                     MetaWindow        *window)
+{
+  MetaPlugin *plugin = plugin_mgr->plugin;
+  MetaPluginClass *klass = META_PLUGIN_GET_CLASS (plugin);
+
+  if (klass->create_inhibit_shortcuts_dialog)
+    return klass->create_inhibit_shortcuts_dialog (plugin, window);
+
+  return meta_inhibit_shortcuts_dialog_default_new (window);
+}

src/compositor/meta-plugin-manager.h

@@ -94,4 +94,8 @@ void meta_plugin_manager_show_window_menu_for_rect (MetaPluginManager  *mgr,
 MetaCloseDialog * meta_plugin_manager_create_close_dialog (MetaPluginManager *plugin_mgr,
                                                            MetaWindow        *window);
 
+MetaInhibitShortcutsDialog *
+  meta_plugin_manager_create_inhibit_shortcuts_dialog (MetaPluginManager *plugin_mgr,
+                                                       MetaWindow        *window);
+
 #endif

src/meta/meta-plugin.h

@@ -27,6 +27,7 @@
 #include <meta/compositor-mutter.h>
 #include <meta/meta-version.h>
 #include <meta/meta-close-dialog.h>
+#include <meta/meta-inhibit-shortcuts-dialog.h>
 
 #include <clutter/clutter.h>
 #include <X11/extensions/Xfixes.h>
@@ -239,6 +240,17 @@ struct _MetaPluginClass
    */
   MetaCloseDialog * (* create_close_dialog) (MetaPlugin *plugin,
                                              MetaWindow *window);
+
+  /**
+   * MetaPluginClass::create_inhibit_shortcuts_dialog:
+   * @plugin: a #MetaPlugin
+   * @window: a #MetaWindow
+   *
+   * Virtual function called to create a "inhibit shortcuts" dialog
+   * when a client requests compositor shortcuts to be inhibited.
+   */
+  MetaInhibitShortcutsDialog * (* create_inhibit_shortcuts_dialog) (MetaPlugin *plugin,
+                                                                    MetaWindow *window);
 };
 
 /**