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GtkModelMenuItem: add a submenu action attribute

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Add support for a stateful action associated with a submenu.  The action
state is set to TRUE when the menu is shown and FALSE when it is
unshown.

This is useful to avoid unnecessary processing for menus that have
frequently-changing content.

A possible future feature is to add support for asynchronously filling
the initial state of the menu by waiting until the action actually emits
its state-change signal to TRUE before showing the menu.

A silly example has been added to Bloatpad to demonstrate the new
feature.

https://bugzilla.gnome.org/show_bug.cgi?id=682630
This commit is contained in:
Ryan Lortie
2012-08-24 14:11:37 -04:00
parent 9480e21506
commit 338b5f6c2d
2 changed files with 125 additions and 2 deletions
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82
examples/bloatpad.c
View File

@ -191,7 +191,14 @@ bloat_pad_open (GApplication *application,
new_window (application, files[i]);
}
typedef GtkApplication BloatPad;
typedef struct
{
GtkApplication parent_instance;
GMenu *time;
guint timeout;
} BloatPad;
typedef GtkApplicationClass BloatPadClass;
G_DEFINE_TYPE (BloatPad, bloat_pad, GTK_TYPE_APPLICATION)
@ -234,15 +241,65 @@ quit_activated (GSimpleAction *action,
g_application_quit (app);
}
static gboolean
update_time (gpointer user_data)
{
BloatPad *bloatpad = user_data;
GDateTime *now;
gchar *time;
while (g_menu_model_get_n_items (G_MENU_MODEL (bloatpad->time)))
g_menu_remove (bloatpad->time, 0);
g_message ("Updating the time menu (which should be open now)...");
now = g_date_time_new_now_local ();
time = g_date_time_format (now, "%c");
g_menu_append (bloatpad->time, time, NULL);
g_date_time_unref (now);
g_free (time);
return G_SOURCE_CONTINUE;
}
static void
time_active_changed (GSimpleAction *action,
GVariant *state,
gpointer user_data)
{
BloatPad *bloatpad = user_data;
if (g_variant_get_boolean (state))
{
if (!bloatpad->timeout)
{
bloatpad->timeout = g_timeout_add (1000, update_time, bloatpad);
update_time (bloatpad);
}
}
else
{
if (bloatpad->timeout)
{
g_source_remove (bloatpad->timeout);
bloatpad->timeout = 0;
}
}
g_simple_action_set_state (action, state);
}
static GActionEntry app_entries[] = {
{ "new", new_activated, NULL, NULL, NULL },
{ "about", about_activated, NULL, NULL, NULL },
{ "quit", quit_activated, NULL, NULL, NULL },
{ "time-active", NULL, NULL, "false", time_active_changed }
};
static void
bloat_pad_startup (GApplication *application)
{
BloatPad *bloatpad = (BloatPad*) application;
GtkBuilder *builder;
G_APPLICATION_CLASS (bloat_pad_parent_class)
@ -301,13 +358,33 @@ bloat_pad_startup (GApplication *application)
" </item>"
" </section>"
" </submenu>"
" <submenu id='time-menu'>"
" <attribute name='label' translatable='yes'>Time</attribute>"
" <attribute name='submenu-action'>app.time-active</attribute>"
" </submenu>"
" </menu>"
"</interface>", -1, NULL);
gtk_application_set_app_menu (GTK_APPLICATION (application), G_MENU_MODEL (gtk_builder_get_object (builder, "app-menu")));
gtk_application_set_menubar (GTK_APPLICATION (application), G_MENU_MODEL (gtk_builder_get_object (builder, "menubar")));
bloatpad->time = G_MENU (gtk_builder_get_object (builder, "time-menu"));
g_object_unref (builder);
}
static void
bloat_pad_shutdown (GApplication *application)
{
BloatPad *bloatpad = (BloatPad *) application;
if (bloatpad->timeout)
{
g_source_remove (bloatpad->timeout);
bloatpad->timeout = 0;
}
G_APPLICATION_CLASS (bloat_pad_parent_class)
->shutdown (application);
}
static void
bloat_pad_init (BloatPad *app)
{
@ -320,6 +397,7 @@ bloat_pad_class_init (BloatPadClass *class)
GObjectClass *object_class = G_OBJECT_CLASS (class);
application_class->startup = bloat_pad_startup;
application_class->shutdown = bloat_pad_shutdown;
application_class->activate = bloat_pad_activate;
application_class->open = bloat_pad_open;
@ -330,7 +408,7 @@ bloat_pad_class_init (BloatPadClass *class)
BloatPad *
bloat_pad_new (void)
{
GtkApplication *bloat_pad;
BloatPad *bloat_pad;
g_type_init ();

45
gtk/gtkmodelmenuitem.c
View File

@ -24,6 +24,7 @@
#include "gtkaccelmapprivate.h"
#include "gtkactionhelper.h"
#include "gtkmodelmenu.h"
#include "gtkwidgetprivate.h"
struct _GtkModelMenuItem
{
@ -80,6 +81,28 @@ gtk_actionable_set_namespaced_action_name (GtkActionable *actionable,
}
}
static void
gtk_model_menu_item_submenu_shown (GtkWidget *widget,
gpointer user_data)
{
const gchar *action_name = user_data;
GActionMuxer *muxer;
muxer = _gtk_widget_get_action_muxer (widget);
g_action_group_change_action_state (G_ACTION_GROUP (muxer), action_name, g_variant_new_boolean (TRUE));
}
static void
gtk_model_menu_item_submenu_hidden (GtkWidget *widget,
gpointer user_data)
{
const gchar *action_name = user_data;
GActionMuxer *muxer;
muxer = _gtk_widget_get_action_muxer (widget);
g_action_group_change_action_state (G_ACTION_GROUP (muxer), action_name, g_variant_new_boolean (FALSE));
}
static void
gtk_model_menu_item_setup (GtkModelMenuItem *item,
GMenuModel *model,
@ -129,6 +152,28 @@ gtk_model_menu_item_setup (GtkModelMenuItem *item,
else if (g_str_equal (key, "target"))
gtk_actionable_set_action_target_value (GTK_ACTIONABLE (item), value);
else if (g_str_equal (key, "submenu-action") && g_variant_is_of_type (value, G_VARIANT_TYPE_STRING))
{
GtkWidget *submenu;
submenu = gtk_menu_item_get_submenu (GTK_MENU_ITEM (item));
if (submenu != NULL)
{
const gchar *action = g_variant_get_string (value, NULL);
gchar *full_action;
if (action_namespace)
full_action = g_strjoin (".", action_namespace, action, NULL);
else
full_action = g_strdup (action);
g_object_set_data_full (G_OBJECT (submenu), "gtkmodelmenu-visibility-action", full_action, g_free);
g_signal_connect (submenu, "show", G_CALLBACK (gtk_model_menu_item_submenu_shown), full_action);
g_signal_connect (submenu, "hide", G_CALLBACK (gtk_model_menu_item_submenu_hidden), full_action);
}
}
g_variant_unref (value);
}
g_object_unref (iter);