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ardour/libs/tk/ytk/gtkactivatable.c

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/* gtkactivatable.c
* Copyright (C) 2008 Tristan Van Berkom <tristan.van.berkom@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:gtkactivatable
* @Short_Description: An interface for activatable widgets
* @Title: GtkActivatable
*
* 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.
*
* <refsect2>
* <title>Implementing GtkActivatable</title>
* <para>
* 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.
* </para>
* <example>
* <title>A class fragment implementing #GtkActivatable</title>
* <programlisting><![CDATA[
*
* 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);
* ...
*
*
* 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));
*
* ...
* }]]></programlisting>
* </example>
* </refsect2>
*/
#include "config.h"
#include "gtkactivatable.h"
#include "gtkactiongroup.h"
#include "gtktypeutils.h"
#include "gtkprivate.h"
#include "gtkintl.h"
#include "gtkalias.h"
static void gtk_activatable_class_init (gpointer g_iface);
GType
gtk_activatable_get_type (void)
{
static GType activatable_type = 0;
if (!activatable_type) {
activatable_type =
g_type_register_static_simple (G_TYPE_INTERFACE, I_("GtkActivatable"),
sizeof (GtkActivatableIface),
(GClassInitFunc) gtk_activatable_class_init,
0, NULL, 0);
g_type_interface_add_prerequisite (activatable_type, G_TYPE_OBJECT);
}
return activatable_type;
}
static void
gtk_activatable_class_init (gpointer g_iface)
{
/**
* GtkActivatable:related-action:
*
* The action that this activatable will activate and receive
* updates from for various states and possibly appearance.
*
* <note><para>#GtkActivatable implementors need to handle the this property and
* call gtk_activatable_do_set_related_action() when it changes.</para></note>
*
* Since: 2.16
*/
g_object_interface_install_property (g_iface,
g_param_spec_object ("related-action",
P_("Related Action"),
P_("The action this activatable will activate and receive updates from"),
GTK_TYPE_ACTION,
GTK_PARAM_READWRITE));
/**
* GtkActivatable:use-action-appearance:
*
* Whether this activatable should reset its layout
* and appearance when setting the related action or when
* the action changes appearance.
*
* See the #GtkAction documentation directly to find which properties
* should be ignored by the #GtkActivatable when this property is %FALSE.
*
* <note><para>#GtkActivatable implementors need to handle this property
* and call gtk_activatable_sync_action_properties() on the activatable
* widget when it changes.</para></note>
*
* Since: 2.16
*/
g_object_interface_install_property (g_iface,
g_param_spec_boolean ("use-action-appearance",
P_("Use Action Appearance"),
P_("Whether to use the related actions appearance properties"),
TRUE,
GTK_PARAM_READWRITE));
}
static void
gtk_activatable_update (GtkActivatable *activatable,
GtkAction *action,
const gchar *property_name)
{
GtkActivatableIface *iface;
g_return_if_fail (GTK_IS_ACTIVATABLE (activatable));
iface = GTK_ACTIVATABLE_GET_IFACE (activatable);
if (iface->update)
iface->update (activatable, action, property_name);
else
g_critical ("GtkActivatable->update() unimplemented for type %s",
g_type_name (G_OBJECT_TYPE (activatable)));
}
/**
* gtk_activatable_sync_action_properties:
* @activatable: a #GtkActivatable
* @action: (allow-none): the related #GtkAction or %NULL
*
* 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.
*
* Since: 2.16
**/
void
gtk_activatable_sync_action_properties (GtkActivatable *activatable,
GtkAction *action)
{
GtkActivatableIface *iface;
g_return_if_fail (GTK_IS_ACTIVATABLE (activatable));
iface = GTK_ACTIVATABLE_GET_IFACE (activatable);
if (iface->sync_action_properties)
iface->sync_action_properties (activatable, action);
else
g_critical ("GtkActivatable->sync_action_properties() unimplemented for type %s",
g_type_name (G_OBJECT_TYPE (activatable)));
}
/**
* gtk_activatable_set_related_action:
* @activatable: a #GtkActivatable
* @action: the #GtkAction to set
*
* Sets the related action on the @activatable object.
*
* <note><para>#GtkActivatable implementors need to handle the #GtkActivatable:related-action
* property and call gtk_activatable_do_set_related_action() when it changes.</para></note>
*
* Since: 2.16
**/
void
gtk_activatable_set_related_action (GtkActivatable *activatable,
GtkAction *action)
{
g_return_if_fail (GTK_IS_ACTIVATABLE (activatable));
g_return_if_fail (action == NULL || GTK_IS_ACTION (action));
g_object_set (activatable, "related-action", action, NULL);
}
static void
gtk_activatable_action_notify (GtkAction *action,
GParamSpec *pspec,
GtkActivatable *activatable)
{
gtk_activatable_update (activatable, action, pspec->name);
}
/**
* gtk_activatable_do_set_related_action:
* @activatable: a #GtkActivatable
* @action: the #GtkAction to set
*
* This is a utility function for #GtkActivatable implementors.
*
* When implementing #GtkActivatable you must call this when
* handling changes of the #GtkActivatable:related-action, and
* you must also use this to break references in #GObject->dispose().
*
* This function adds a reference to the currently set related
* action for you, it also makes sure the #GtkActivatable->update()
* method is called when the related #GtkAction properties change
* and registers to the action's proxy list.
*
* <note><para>Be careful to call this before setting the local
* copy of the #GtkAction property, since this function uses
* gtk_activatable_get_action() to retrieve the previous action</para></note>
*
* Since: 2.16
*/
void
gtk_activatable_do_set_related_action (GtkActivatable *activatable,
GtkAction *action)
{
GtkAction *prev_action;
prev_action = gtk_activatable_get_related_action (activatable);
if (prev_action != action)
{
if (prev_action)
{
g_signal_handlers_disconnect_by_func (prev_action, gtk_activatable_action_notify, activatable);
/* Check the type so that actions can be activatable too. */
if (GTK_IS_WIDGET (activatable))
_gtk_action_remove_from_proxy_list (prev_action, GTK_WIDGET (activatable));
/* Some apps are using the object data directly...
* so continue to set it for a bit longer
*/
g_object_set_data (G_OBJECT (activatable), "gtk-action", NULL);
/*
* We don't want prev_action to be activated
* during the sync_action_properties() call when syncing "active".
*/
gtk_action_block_activate (prev_action);
}
/* Some applications rely on their proxy UI to be set up
* before they receive the ::connect-proxy signal, so we
* need to call sync_action_properties() before add_to_proxy_list().
*/
gtk_activatable_sync_action_properties (activatable, action);
if (prev_action)
{
gtk_action_unblock_activate (prev_action);
g_object_unref (prev_action);
}
if (action)
{
g_object_ref (action);
g_signal_connect (G_OBJECT (action), "notify", G_CALLBACK (gtk_activatable_action_notify), activatable);
if (GTK_IS_WIDGET (activatable))
_gtk_action_add_to_proxy_list (action, GTK_WIDGET (activatable));
g_object_set_data (G_OBJECT (activatable), "gtk-action", action);
}
}
}
/**
* gtk_activatable_get_related_action:
* @activatable: a #GtkActivatable
*
* Gets the related #GtkAction for @activatable.
*
* Returns: (transfer none): the related #GtkAction if one is set.
*
* Since: 2.16
**/
GtkAction *
gtk_activatable_get_related_action (GtkActivatable *activatable)
{
GtkAction *action;
g_return_val_if_fail (GTK_IS_ACTIVATABLE (activatable), NULL);
g_object_get (activatable, "related-action", &action, NULL);
/* g_object_get() gives us a ref... */
if (action)
g_object_unref (action);
return action;
}
/**
* gtk_activatable_set_use_action_appearance:
* @activatable: a #GtkActivatable
* @use_appearance: whether to use the actions appearance
*
* Sets whether this activatable should reset its layout and appearance
* when setting the related action or when the action changes appearance
*
* <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;
}
#define __GTK_ACTIVATABLE_C__
#include "gtkaliasdef.c"
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