542 lines
16 KiB
C
542 lines
16 KiB
C
/* gtkactivatable.c
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* Copyright (C) 2008 Tristan Van Berkom <tristan.van.berkom@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* SECTION:gtkactivatable
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* @Short_Description: An interface for activatable widgets
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* @Title: GtkActivatable
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*
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* Activatable widgets can be connected to a #GtkAction and reflects
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* the state of its action. A #GtkActivatable can also provide feedback
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* through its action, as they are responsible for activating their
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* related actions.
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*
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* <refsect2>
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* <title>Implementing GtkActivatable</title>
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* <para>
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* When extending a class that is already #GtkActivatable; it is only
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* necessary to implement the #GtkActivatable->sync_action_properties()
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* and #GtkActivatable->update() methods and chain up to the parent
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* implementation, however when introducing
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* a new #GtkActivatable class; the #GtkActivatable:related-action and
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* #GtkActivatable:use-action-appearance properties need to be handled by
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* the implementor. Handling these properties is mostly a matter of installing
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* the action pointer and boolean flag on your instance, and calling
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* gtk_activatable_do_set_related_action() and
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* gtk_activatable_sync_action_properties() at the appropriate times.
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* </para>
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* <example>
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* <title>A class fragment implementing #GtkActivatable</title>
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* <programlisting><![CDATA[
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*
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* enum {
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* ...
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*
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* PROP_ACTIVATABLE_RELATED_ACTION,
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* PROP_ACTIVATABLE_USE_ACTION_APPEARANCE
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* }
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*
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* struct _FooBarPrivate
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* {
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*
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* ...
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*
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* GtkAction *action;
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* gboolean use_action_appearance;
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* };
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*
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* ...
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*
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* static void foo_bar_activatable_interface_init (GtkActivatableIface *iface);
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* static void foo_bar_activatable_update (GtkActivatable *activatable,
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* GtkAction *action,
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* const gchar *property_name);
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* static void foo_bar_activatable_sync_action_properties (GtkActivatable *activatable,
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* GtkAction *action);
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* ...
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*
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*
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* static void
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* foo_bar_class_init (FooBarClass *klass)
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* {
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*
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* ...
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*
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* g_object_class_override_property (gobject_class, PROP_ACTIVATABLE_RELATED_ACTION, "related-action");
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* g_object_class_override_property (gobject_class, PROP_ACTIVATABLE_USE_ACTION_APPEARANCE, "use-action-appearance");
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*
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* ...
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* }
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*
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*
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* static void
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* foo_bar_activatable_interface_init (GtkActivatableIface *iface)
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* {
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* iface->update = foo_bar_activatable_update;
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* iface->sync_action_properties = foo_bar_activatable_sync_action_properties;
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* }
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*
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* ... Break the reference using gtk_activatable_do_set_related_action()...
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*
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* static void
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* foo_bar_dispose (GObject *object)
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* {
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* FooBar *bar = FOO_BAR (object);
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* FooBarPrivate *priv = FOO_BAR_GET_PRIVATE (bar);
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*
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* ...
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*
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* if (priv->action)
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* {
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* gtk_activatable_do_set_related_action (GTK_ACTIVATABLE (bar), NULL);
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* priv->action = NULL;
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* }
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* G_OBJECT_CLASS (foo_bar_parent_class)->dispose (object);
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* }
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*
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* ... Handle the "related-action" and "use-action-appearance" properties ...
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*
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* static void
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* foo_bar_set_property (GObject *object,
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* guint prop_id,
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* const GValue *value,
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* GParamSpec *pspec)
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* {
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* FooBar *bar = FOO_BAR (object);
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* FooBarPrivate *priv = FOO_BAR_GET_PRIVATE (bar);
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*
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* switch (prop_id)
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* {
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*
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* ...
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*
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* case PROP_ACTIVATABLE_RELATED_ACTION:
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* foo_bar_set_related_action (bar, g_value_get_object (value));
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* break;
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* case PROP_ACTIVATABLE_USE_ACTION_APPEARANCE:
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* foo_bar_set_use_action_appearance (bar, g_value_get_boolean (value));
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* break;
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* default:
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* G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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* break;
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* }
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* }
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*
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* static void
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* foo_bar_get_property (GObject *object,
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* guint prop_id,
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* GValue *value,
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* GParamSpec *pspec)
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* {
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* FooBar *bar = FOO_BAR (object);
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* FooBarPrivate *priv = FOO_BAR_GET_PRIVATE (bar);
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*
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* switch (prop_id)
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* {
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*
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* ...
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*
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* case PROP_ACTIVATABLE_RELATED_ACTION:
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* g_value_set_object (value, priv->action);
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* break;
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* case PROP_ACTIVATABLE_USE_ACTION_APPEARANCE:
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* g_value_set_boolean (value, priv->use_action_appearance);
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* break;
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* default:
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* G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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* break;
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* }
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* }
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*
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*
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* static void
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* foo_bar_set_use_action_appearance (FooBar *bar,
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* gboolean use_appearance)
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* {
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* FooBarPrivate *priv = FOO_BAR_GET_PRIVATE (bar);
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*
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* if (priv->use_action_appearance != use_appearance)
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* {
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* priv->use_action_appearance = use_appearance;
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*
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* gtk_activatable_sync_action_properties (GTK_ACTIVATABLE (bar), priv->action);
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* }
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* }
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*
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* ... call gtk_activatable_do_set_related_action() and then assign the action pointer,
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* no need to reference the action here since gtk_activatable_do_set_related_action() already
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* holds a reference here for you...
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* static void
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* foo_bar_set_related_action (FooBar *bar,
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* GtkAction *action)
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* {
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* FooBarPrivate *priv = FOO_BAR_GET_PRIVATE (bar);
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*
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* if (priv->action == action)
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* return;
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*
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* gtk_activatable_do_set_related_action (GTK_ACTIVATABLE (bar), action);
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*
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* priv->action = action;
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* }
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*
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* ... Selectively reset and update activatable depending on the use-action-appearance property ...
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* static void
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* gtk_button_activatable_sync_action_properties (GtkActivatable *activatable,
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* GtkAction *action)
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* {
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* GtkButtonPrivate *priv = GTK_BUTTON_GET_PRIVATE (activatable);
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*
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* if (!action)
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* return;
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*
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* if (gtk_action_is_visible (action))
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* gtk_widget_show (GTK_WIDGET (activatable));
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* else
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* gtk_widget_hide (GTK_WIDGET (activatable));
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*
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* gtk_widget_set_sensitive (GTK_WIDGET (activatable), gtk_action_is_sensitive (action));
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*
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* ...
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*
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* if (priv->use_action_appearance)
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* {
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* if (gtk_action_get_stock_id (action))
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* foo_bar_set_stock (button, gtk_action_get_stock_id (action));
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* else if (gtk_action_get_label (action))
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* foo_bar_set_label (button, gtk_action_get_label (action));
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*
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* ...
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*
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* }
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* }
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*
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* static void
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* foo_bar_activatable_update (GtkActivatable *activatable,
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* GtkAction *action,
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* const gchar *property_name)
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* {
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* FooBarPrivate *priv = FOO_BAR_GET_PRIVATE (activatable);
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*
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* if (strcmp (property_name, "visible") == 0)
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* {
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* if (gtk_action_is_visible (action))
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* gtk_widget_show (GTK_WIDGET (activatable));
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* else
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* gtk_widget_hide (GTK_WIDGET (activatable));
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* }
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* else if (strcmp (property_name, "sensitive") == 0)
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* gtk_widget_set_sensitive (GTK_WIDGET (activatable), gtk_action_is_sensitive (action));
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*
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* ...
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*
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* if (!priv->use_action_appearance)
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* return;
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*
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* if (strcmp (property_name, "stock-id") == 0)
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* foo_bar_set_stock (button, gtk_action_get_stock_id (action));
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* else if (strcmp (property_name, "label") == 0)
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* foo_bar_set_label (button, gtk_action_get_label (action));
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*
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* ...
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* }]]></programlisting>
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* </example>
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* </refsect2>
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*/
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#include "config.h"
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#include "gtkactivatable.h"
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#include "gtkactiongroup.h"
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#include "gtkprivate.h"
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#include "gtkintl.h"
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typedef GtkActivatableIface GtkActivatableInterface;
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G_DEFINE_INTERFACE (GtkActivatable, gtk_activatable, G_TYPE_OBJECT)
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static void
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gtk_activatable_default_init (GtkActivatableInterface *iface)
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{
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/**
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* GtkActivatable:related-action:
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*
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* The action that this activatable will activate and receive
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* updates from for various states and possibly appearance.
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*
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* <note><para>#GtkActivatable implementors need to handle the this property and
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* call gtk_activatable_do_set_related_action() when it changes.</para></note>
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*
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* Since: 2.16
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*/
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g_object_interface_install_property (iface,
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g_param_spec_object ("related-action",
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P_("Related Action"),
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P_("The action this activatable will activate and receive updates from"),
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GTK_TYPE_ACTION,
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GTK_PARAM_READWRITE));
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/**
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* GtkActivatable:use-action-appearance:
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*
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* Whether this activatable should reset its layout
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* and appearance when setting the related action or when
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* the action changes appearance.
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*
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* See the #GtkAction documentation directly to find which properties
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* should be ignored by the #GtkActivatable when this property is %FALSE.
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*
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* <note><para>#GtkActivatable implementors need to handle this property
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* and call gtk_activatable_sync_action_properties() on the activatable
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* widget when it changes.</para></note>
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*
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* Since: 2.16
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*/
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g_object_interface_install_property (iface,
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g_param_spec_boolean ("use-action-appearance",
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P_("Use Action Appearance"),
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P_("Whether to use the related actions appearance properties"),
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TRUE,
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GTK_PARAM_READWRITE));
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}
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static void
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gtk_activatable_update (GtkActivatable *activatable,
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GtkAction *action,
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const gchar *property_name)
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{
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GtkActivatableIface *iface;
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g_return_if_fail (GTK_IS_ACTIVATABLE (activatable));
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iface = GTK_ACTIVATABLE_GET_IFACE (activatable);
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if (iface->update)
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iface->update (activatable, action, property_name);
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else
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g_critical ("GtkActivatable->update() unimplemented for type %s",
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g_type_name (G_OBJECT_TYPE (activatable)));
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}
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/**
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* gtk_activatable_sync_action_properties:
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* @activatable: a #GtkActivatable
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* @action: (allow-none): the related #GtkAction or %NULL
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*
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* This is called to update the activatable completely, this is called
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* internally when the #GtkActivatable:related-action property is set
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* or unset and by the implementing class when
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* #GtkActivatable:use-action-appearance changes.
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*
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* Since: 2.16
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**/
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void
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gtk_activatable_sync_action_properties (GtkActivatable *activatable,
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GtkAction *action)
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{
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GtkActivatableIface *iface;
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g_return_if_fail (GTK_IS_ACTIVATABLE (activatable));
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iface = GTK_ACTIVATABLE_GET_IFACE (activatable);
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if (iface->sync_action_properties)
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iface->sync_action_properties (activatable, action);
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else
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g_critical ("GtkActivatable->sync_action_properties() unimplemented for type %s",
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g_type_name (G_OBJECT_TYPE (activatable)));
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}
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/**
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* gtk_activatable_set_related_action:
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* @activatable: a #GtkActivatable
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* @action: the #GtkAction to set
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*
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* Sets the related action on the @activatable object.
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*
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* <note><para>#GtkActivatable implementors need to handle the #GtkActivatable:related-action
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* property and call gtk_activatable_do_set_related_action() when it changes.</para></note>
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*
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* Since: 2.16
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**/
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void
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gtk_activatable_set_related_action (GtkActivatable *activatable,
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GtkAction *action)
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{
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g_return_if_fail (GTK_IS_ACTIVATABLE (activatable));
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g_return_if_fail (action == NULL || GTK_IS_ACTION (action));
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g_object_set (activatable, "related-action", action, NULL);
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}
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static void
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gtk_activatable_action_notify (GtkAction *action,
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GParamSpec *pspec,
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GtkActivatable *activatable)
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{
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gtk_activatable_update (activatable, action, pspec->name);
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}
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/**
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* gtk_activatable_do_set_related_action:
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* @activatable: a #GtkActivatable
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* @action: the #GtkAction to set
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*
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* This is a utility function for #GtkActivatable implementors.
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*
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* When implementing #GtkActivatable you must call this when
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* handling changes of the #GtkActivatable:related-action, and
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* you must also use this to break references in #GObject->dispose().
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*
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* This function adds a reference to the currently set related
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* action for you, it also makes sure the #GtkActivatable->update()
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* method is called when the related #GtkAction properties change
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* and registers to the action's proxy list.
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*
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* <note><para>Be careful to call this before setting the local
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* copy of the #GtkAction property, since this function uses
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* gtk_activatable_get_related_action() to retrieve the
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* previous action</para></note>
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*
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* Since: 2.16
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*/
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void
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gtk_activatable_do_set_related_action (GtkActivatable *activatable,
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GtkAction *action)
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{
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GtkAction *prev_action;
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prev_action = gtk_activatable_get_related_action (activatable);
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if (prev_action != action)
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{
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if (prev_action)
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{
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g_signal_handlers_disconnect_by_func (prev_action, gtk_activatable_action_notify, activatable);
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/* Check the type so that actions can be activatable too. */
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if (GTK_IS_WIDGET (activatable))
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_gtk_action_remove_from_proxy_list (prev_action, GTK_WIDGET (activatable));
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/* Some apps are using the object data directly...
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* so continue to set it for a bit longer
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*/
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g_object_set_data (G_OBJECT (activatable), "gtk-action", NULL);
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/*
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* We don't want prev_action to be activated
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* during the sync_action_properties() call when syncing "active".
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*/
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gtk_action_block_activate (prev_action);
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}
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/* Some applications rely on their proxy UI to be set up
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* before they receive the ::connect-proxy signal, so we
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* need to call sync_action_properties() before add_to_proxy_list().
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*/
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gtk_activatable_sync_action_properties (activatable, action);
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if (prev_action)
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{
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gtk_action_unblock_activate (prev_action);
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g_object_unref (prev_action);
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}
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if (action)
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{
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g_object_ref (action);
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g_signal_connect (G_OBJECT (action), "notify", G_CALLBACK (gtk_activatable_action_notify), activatable);
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if (GTK_IS_WIDGET (activatable))
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_gtk_action_add_to_proxy_list (action, GTK_WIDGET (activatable));
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g_object_set_data (G_OBJECT (activatable), "gtk-action", action);
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}
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}
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}
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/**
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* gtk_activatable_get_related_action:
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* @activatable: a #GtkActivatable
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*
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* Gets the related #GtkAction for @activatable.
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*
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* Returns: (transfer none): the related #GtkAction if one is set.
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*
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* Since: 2.16
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**/
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GtkAction *
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gtk_activatable_get_related_action (GtkActivatable *activatable)
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{
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GtkAction *action;
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g_return_val_if_fail (GTK_IS_ACTIVATABLE (activatable), NULL);
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g_object_get (activatable, "related-action", &action, NULL);
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/* g_object_get() gives us a ref... */
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if (action)
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g_object_unref (action);
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return action;
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}
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/**
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* gtk_activatable_set_use_action_appearance:
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* @activatable: a #GtkActivatable
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* @use_appearance: whether to use the actions appearance
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*
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* Sets whether this activatable should reset its layout and appearance
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* when setting the related action or when the action changes appearance
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*
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|
* <note><para>#GtkActivatable implementors need to handle the
|
|
* #GtkActivatable:use-action-appearance property and call
|
|
* gtk_activatable_sync_action_properties() to update @activatable
|
|
* if needed.</para></note>
|
|
*
|
|
* Since: 2.16
|
|
**/
|
|
void
|
|
gtk_activatable_set_use_action_appearance (GtkActivatable *activatable,
|
|
gboolean use_appearance)
|
|
{
|
|
g_object_set (activatable, "use-action-appearance", use_appearance, NULL);
|
|
}
|
|
|
|
/**
|
|
* gtk_activatable_get_use_action_appearance:
|
|
* @activatable: a #GtkActivatable
|
|
*
|
|
* Gets whether this activatable should reset its layout
|
|
* and appearance when setting the related action or when
|
|
* the action changes appearance.
|
|
*
|
|
* Returns: whether @activatable uses its actions appearance.
|
|
*
|
|
* Since: 2.16
|
|
**/
|
|
gboolean
|
|
gtk_activatable_get_use_action_appearance (GtkActivatable *activatable)
|
|
{
|
|
gboolean use_appearance;
|
|
|
|
g_object_get (activatable, "use-action-appearance", &use_appearance, NULL);
|
|
|
|
return use_appearance;
|
|
}
|