This is a utility function for #GtkActivatable implementors.
Get the main Gtk struct
Gets the related #GtkAction for @activatable.
Gets whether this activatable should reset its layout and appearance when setting the related action or when the action changes appearance.
Sets the related action on the @activatable object.
Sets whether this activatable should reset its layout and appearance when setting the related action or when the action changes appearance
This is called to update the activatable completely, this is called internally when the #GtkActivatable:related-action property is set or unset and by the implementing class when #GtkActivatable:use-action-appearance changes.
static void foo_bar_class_init (FooBarClass *klass) {
...
g_object_class_override_property (gobject_class, PROP_ACTIVATABLE_RELATED_ACTION, "related-action"); g_object_class_override_property (gobject_class, PROP_ACTIVATABLE_USE_ACTION_APPEARANCE, "use-action-appearance");
... }
static void foo_bar_activatable_interface_init (GtkActivatableIface *iface) { iface->update = foo_bar_activatable_update; iface->sync_action_properties = foo_bar_activatable_sync_action_properties; }
... Break the reference using gtk_activatable_do_set_related_action()...
static void foo_bar_dispose (GObject *object) { FooBar *bar = FOO_BAR (object); FooBarPrivate *priv = FOO_BAR_GET_PRIVATE (bar);
...
if (priv->action) { gtk_activatable_do_set_related_action (GTK_ACTIVATABLE (bar), NULL); priv->action = NULL; } G_OBJECT_CLASS (foo_bar_parent_class)->dispose (object); }
... Handle the “related-action” and “use-action-appearance” properties ...
static void foo_bar_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { FooBar *bar = FOO_BAR (object); FooBarPrivate *priv = FOO_BAR_GET_PRIVATE (bar);
switch (prop_id) {
...
case PROP_ACTIVATABLE_RELATED_ACTION: foo_bar_set_related_action (bar, g_value_get_object (value)); break; case PROP_ACTIVATABLE_USE_ACTION_APPEARANCE: foo_bar_set_use_action_appearance (bar, g_value_get_boolean (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } }
static void foo_bar_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { FooBar *bar = FOO_BAR (object); FooBarPrivate *priv = FOO_BAR_GET_PRIVATE (bar);
switch (prop_id) {
...
case PROP_ACTIVATABLE_RELATED_ACTION: g_value_set_object (value, priv->action); break; case PROP_ACTIVATABLE_USE_ACTION_APPEARANCE: g_value_set_boolean (value, priv->use_action_appearance); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } }
static void foo_bar_set_use_action_appearance (FooBar *bar, gboolean use_appearance) { FooBarPrivate *priv = FOO_BAR_GET_PRIVATE (bar);
if (priv->use_action_appearance != use_appearance) { priv->use_action_appearance = use_appearance;
gtk_activatable_sync_action_properties (GTK_ACTIVATABLE (bar), priv->action); } }
... call gtk_activatable_do_set_related_action() and then assign the action pointer, no need to reference the action here since gtk_activatable_do_set_related_action() already holds a reference here for you... static void foo_bar_set_related_action (FooBar *bar, GtkAction *action) { FooBarPrivate *priv = FOO_BAR_GET_PRIVATE (bar);
if (priv->action == action) return;
gtk_activatable_do_set_related_action (GTK_ACTIVATABLE (bar), action);
priv->action = action; }
... Selectively reset and update activatable depending on the use-action-appearance property ... static void gtk_button_activatable_sync_action_properties (GtkActivatable *activatable, GtkAction *action) { GtkButtonPrivate *priv = GTK_BUTTON_GET_PRIVATE (activatable);
if (!action) return;
if (gtk_action_is_visible (action)) gtk_widget_show (GTK_WIDGET (activatable)); else gtk_widget_hide (GTK_WIDGET (activatable));
gtk_widget_set_sensitive (GTK_WIDGET (activatable), gtk_action_is_sensitive (action));
...
if (priv->use_action_appearance) { if (gtk_action_get_stock_id (action)) foo_bar_set_stock (button, gtk_action_get_stock_id (action)); else if (gtk_action_get_label (action)) foo_bar_set_label (button, gtk_action_get_label (action));
...
} }
static void foo_bar_activatable_update (GtkActivatable *activatable, GtkAction *action, const gchar *property_name) { FooBarPrivate *priv = FOO_BAR_GET_PRIVATE (activatable);
if (strcmp (property_name, "visible") == 0) { if (gtk_action_is_visible (action)) gtk_widget_show (GTK_WIDGET (activatable)); else gtk_widget_hide (GTK_WIDGET (activatable)); } else if (strcmp (property_name, "sensitive") == 0) gtk_widget_set_sensitive (GTK_WIDGET (activatable), gtk_action_is_sensitive (action));
...
if (!priv->use_action_appearance) return;
if (strcmp (property_name, "stock-id") == 0) foo_bar_set_stock (button, gtk_action_get_stock_id (action)); else if (strcmp (property_name, "label") == 0) foo_bar_set_label (button, gtk_action_get_label (action));
... } ]|
Activatable widgets can be connected to a #GtkAction and reflects the state of its action. A #GtkActivatable can also provide feedback through its action, as they are responsible for activating their related actions.
Implementing GtkActivatable
When extending a class that is already #GtkActivatable; it is only necessary to implement the #GtkActivatable->sync_action_properties() and #GtkActivatable->update() methods and chain up to the parent implementation, however when introducing a new #GtkActivatable class; the #GtkActivatable:related-action and #GtkActivatable:use-action-appearance properties need to be handled by the implementor. Handling these properties is mostly a matter of installing the action pointer and boolean flag on your instance, and calling gtk_activatable_do_set_related_action() and gtk_activatable_sync_action_properties() at the appropriate times.
A class fragment implementing #GtkActivatable
|[<!-- language="C" -->
enum { ...
PROP_ACTIVATABLE_RELATED_ACTION, PROP_ACTIVATABLE_USE_ACTION_APPEARANCE }
struct _FooBarPrivate {
...
GtkAction *action; gboolean use_action_appearance; };
...
static void foo_bar_activatable_interface_init (GtkActivatableIface *iface); static void foo_bar_activatable_update (GtkActivatable *activatable, GtkAction *action, const gchar *property_name); static void foo_bar_activatable_sync_action_properties (GtkActivatable *activatable, GtkAction *action); ...