[gnome-shell] Add ShellMenu

[Colin Walters <walters src gnome org>]

commit 22c445cffc14ebafdd46cba83d86a6e26c0e13ee
Author: Colin Walters <walters verbum org>
Date:   Thu Sep 3 21:05:16 2009 -0400

    Add ShellMenu
    
    An object with methods and signals useful for implementing popup menus.

 src/Makefile.am  |    2 +
 src/shell-menu.c |  243 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/shell-menu.h |   39 +++++++++
 3 files changed, 284 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 9dd9ff8..da7de38 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -75,6 +75,8 @@ libgnome_shell_la_SOURCES =			\
 	shell-generic-container.h           \
 	shell-gtk-embed.c			\
 	shell-gtk-embed.h			\
+	shell-menu.c       \
+	shell-menu.h       \
 	shell-overflow-list.c		\
 	shell-overflow-list.h		\
 	shell-process.c				\
diff --git a/src/shell-menu.c b/src/shell-menu.c
new file mode 100644
index 0000000..6debaf8
--- /dev/null
+++ b/src/shell-menu.c
@@ -0,0 +1,243 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+
+/**
+ * SECTION:shell-menu
+ * @short_description: A box which acts like a popup menu
+ *
+ * A #BigBox subclass which adds methods and signals useful for implementing
+ * popup-menu like actors.
+ */
+
+#include "shell-menu.h"
+
+G_DEFINE_TYPE(ShellMenu, shell_menu, BIG_TYPE_BOX);
+
+struct _ShellMenuPrivate {
+  gboolean have_grab;
+
+  ClutterActor *selected;
+};
+
+/* Signals */
+enum
+{
+  UNSELECTED,
+  SELECTED,
+  ACTIVATE,
+  POPDOWN,
+  LAST_SIGNAL
+};
+
+static guint shell_menu_signals [LAST_SIGNAL] = { 0 };
+
+static gboolean
+shell_menu_contains (ShellMenu     *box,
+                     ClutterActor  *actor)
+{
+  while (actor != NULL && actor != (ClutterActor*)box)
+    {
+      actor = clutter_actor_get_parent (actor);
+    }
+  return actor != NULL;
+}
+
+static void
+on_selected_destroy (ClutterActor  *actor,
+                     ShellMenu     *box)
+{
+  box->priv->selected = NULL;
+}
+
+static void
+set_selected (ShellMenu      *box,
+              ClutterActor   *actor)
+{
+  if (actor == box->priv->selected)
+    return;
+  if (box->priv->selected)
+    {
+      g_signal_handlers_disconnect_by_func (box->priv->selected, G_CALLBACK(on_selected_destroy), box);
+      g_signal_emit (G_OBJECT (box), shell_menu_signals[UNSELECTED], 0, box->priv->selected);
+    }
+  box->priv->selected = actor;
+  if (box->priv->selected)
+    {
+      g_signal_connect (box->priv->selected, "destroy", G_CALLBACK(on_selected_destroy), box);
+      g_signal_emit (G_OBJECT (box), shell_menu_signals[SELECTED], 0, box->priv->selected);
+    }
+}
+
+static gboolean
+shell_menu_enter_event (ClutterActor         *actor,
+                        ClutterCrossingEvent *event)
+{
+  ShellMenu *box = SHELL_MENU (actor);
+
+  if (!shell_menu_contains (box, event->source))
+    return TRUE;
+
+  if (event->source == (ClutterActor*)box)
+    return TRUE;
+
+  if (g_object_get_data (G_OBJECT (event->source), "shell-is-separator"))
+    return TRUE;
+
+  set_selected (box, event->source);
+
+  return TRUE;
+}
+
+static gboolean
+shell_menu_leave_event (ClutterActor         *actor,
+                        ClutterCrossingEvent *event)
+{
+  ShellMenu *box = SHELL_MENU (actor);
+
+  set_selected (box, NULL);
+
+  return TRUE;
+}
+
+static gboolean
+shell_menu_button_release_event (ClutterActor       *actor,
+                                 ClutterButtonEvent *event)
+{
+  ShellMenu *box = SHELL_MENU (actor);
+
+  if (event->button != 1)
+    return FALSE;
+
+  shell_menu_popdown (box);
+
+  if (!shell_menu_contains (box, event->source))
+    return FALSE;
+
+  if (box->priv->selected == NULL)
+    return FALSE;
+
+  g_signal_emit (G_OBJECT (box), shell_menu_signals[ACTIVATE], 0, box->priv->selected);
+
+  return TRUE;
+}
+
+void
+shell_menu_popup (ShellMenu         *box,
+                  guint              button,
+                  guint32            activate_time)
+{
+  box->priv->have_grab = TRUE;
+  clutter_grab_pointer (CLUTTER_ACTOR (box));
+}
+
+void
+shell_menu_popdown (ShellMenu *box)
+{
+  if (box->priv->have_grab)
+    clutter_ungrab_pointer ();
+  clutter_actor_hide (CLUTTER_ACTOR (box));
+  g_signal_emit (G_OBJECT (box), shell_menu_signals[POPDOWN], 0);
+}
+
+/**
+ * shell_menu_append_separator:
+ * @box:
+ * @separator: An actor which functions as a menu separator
+ * @flags: Packing flags
+ *
+ * Actors added to the menu with default functions are treated like
+ * menu items; this function will add an actor that should instead
+ * be treated like a menu separator.  The current practical effect
+ * is that the separators will not be selectable.
+ */
+void
+shell_menu_append_separator (ShellMenu         *box,
+                             ClutterActor      *separator,
+                             BigBoxPackFlags    flags)
+{
+  g_object_set_data (G_OBJECT (separator), "shell-is-separator", GUINT_TO_POINTER(TRUE));
+  big_box_append (BIG_BOX (box), separator, flags);
+}
+
+static void
+shell_menu_class_init (ShellMenuClass *klass)
+{
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+  ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
+
+  actor_class->enter_event = shell_menu_enter_event;
+  actor_class->leave_event = shell_menu_leave_event;
+  actor_class->button_release_event = shell_menu_button_release_event;
+
+  /**
+   * ShellMenu::unselected
+   * @box: The #ShellMenu
+   * @actor: The previously hovered-over menu item
+   *
+   * This signal is emitted when a menu item transitions to
+   * an unselected state.
+   */
+  shell_menu_signals[UNSELECTED] =
+    g_signal_new ("unselected",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  0,
+                  NULL, NULL,
+                  g_cclosure_marshal_VOID__OBJECT,
+                  G_TYPE_NONE, 1, CLUTTER_TYPE_ACTOR);
+
+  /**
+   * ShellMenu::selected
+   * @box: The #ShellMenu
+   * @actor: The hovered-over menu item
+   *
+   * This signal is emitted when a menu item is in a selected state.
+   */
+  shell_menu_signals[SELECTED] =
+    g_signal_new ("selected",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  0,
+                  NULL, NULL,
+                  g_cclosure_marshal_VOID__OBJECT,
+                  G_TYPE_NONE, 1, CLUTTER_TYPE_ACTOR);
+
+  /**
+   * ShellMenu::activate
+   * @box: The #ShellMenu
+   * @actor: The clicked menu item
+   *
+   * This signal is emitted when a menu item is selected.
+   */
+  shell_menu_signals[ACTIVATE] =
+    g_signal_new ("activate",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  0,
+                  NULL, NULL,
+                  g_cclosure_marshal_VOID__OBJECT,
+                  G_TYPE_NONE, 1, CLUTTER_TYPE_ACTOR);
+
+  /**
+   * ShellMenu::popdown
+   * @box: The #ShellMenu
+   *
+   * This signal is emitted when the menu is removed from the display.
+   */
+  shell_menu_signals[POPDOWN] =
+    g_signal_new ("popdown",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  0,
+                  NULL, NULL,
+                  g_cclosure_marshal_VOID__OBJECT,
+                  G_TYPE_NONE, 0);
+
+  g_type_class_add_private (gobject_class, sizeof (ShellMenuPrivate));
+}
+
+static void
+shell_menu_init (ShellMenu *self)
+{
+  self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, SHELL_TYPE_MENU,
+                                            ShellMenuPrivate);
+}
diff --git a/src/shell-menu.h b/src/shell-menu.h
new file mode 100644
index 0000000..1d0c571
--- /dev/null
+++ b/src/shell-menu.h
@@ -0,0 +1,39 @@
+#ifndef __SHELL_MENU_H__
+#define __SHELL_MENU_H__
+
+#include <clutter/clutter.h>
+#include "big/box.h"
+
+#define SHELL_TYPE_MENU                 (shell_menu_get_type ())
+#define SHELL_MENU(obj)                 (G_TYPE_CHECK_INSTANCE_CAST ((obj), SHELL_TYPE_MENU, ShellMenu))
+#define SHELL_MENU_CLASS(klass)         (G_TYPE_CHECK_CLASS_CAST ((klass), SHELL_TYPE_MENU, ShellMenuClass))
+#define SHELL_IS_MENU(obj)              (G_TYPE_CHECK_INSTANCE_TYPE ((obj), SHELL_TYPE_MENU))
+#define SHELL_IS_MENU_CLASS(klass)      (G_TYPE_CHECK_CLASS_TYPE ((klass), SHELL_TYPE_MENU))
+#define SHELL_MENU_GET_CLASS(obj)       (G_TYPE_INSTANCE_GET_CLASS ((obj), SHELL_TYPE_MENU, ShellMenuClass))
+
+typedef struct _ShellMenu        ShellMenu;
+typedef struct _ShellMenuClass   ShellMenuClass;
+
+typedef struct _ShellMenuPrivate ShellMenuPrivate;
+
+struct _ShellMenu
+{
+    BigBox parent;
+
+    ShellMenuPrivate *priv;
+};
+
+struct _ShellMenuClass
+{
+    BigBoxClass parent_class;
+};
+
+GType shell_menu_get_type (void) G_GNUC_CONST;
+
+void shell_menu_popup (ShellMenu *behavior, guint button, guint32 activate_time);
+
+void shell_menu_append_separator (ShellMenu *behavior, ClutterActor *separator, BigBoxPackFlags flags);
+
+void shell_menu_popdown (ShellMenu *behavior);
+
+#endif /* __SHELL_MENU_H__ */