GtkActivatable

GtkActivatable — An interface for activatable widgets

Synopsis

#include <gtk/gtk.h>

                    GtkActivatable;
                    GtkActivatableIface;
void                gtk_activatable_do_set_related_action
                                                        (GtkActivatable *activatable,
                                                         GtkAction *action);
GtkAction *         gtk_activatable_get_related_action  (GtkActivatable *activatable);
gboolean            gtk_activatable_get_use_action_appearance
                                                        (GtkActivatable *activatable);
void                gtk_activatable_sync_action_properties
                                                        (GtkActivatable *activatable,
                                                         GtkAction *action);
void                gtk_activatable_set_related_action  (GtkActivatable *activatable,
                                                         GtkAction *action);
void                gtk_activatable_set_use_action_appearance
                                                        (GtkActivatable *activatable,
                                                         gboolean use_appearance);

Object Hierarchy

  GInterface
   +----GtkActivatable

Prerequisites

GtkActivatable requires GObject.

Known Implementations

GtkActivatable is implemented by GtkButton, GtkCheckButton, GtkCheckMenuItem, GtkColorButton, GtkFontButton, GtkImageMenuItem, GtkLinkButton, GtkMenuItem, GtkMenuToolButton, GtkOptionMenu, GtkRadioButton, GtkRadioMenuItem, GtkRadioToolButton, GtkRecentChooserMenu, GtkScaleButton, GtkSeparatorMenuItem, GtkSeparatorToolItem, GtkTearoffMenuItem, GtkToggleButton, GtkToggleToolButton, GtkToolButton, GtkToolItem and GtkVolumeButton.

Properties

  "related-action"           GtkAction*            : Read / Write
  "use-action-appearance"    gboolean              : Read / Write

Description

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 "related-action" and "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.

Example 36. A class fragment implementing GtkActivatable

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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));

  ...
}

Details

GtkActivatable

typedef struct _GtkActivatable GtkActivatable;

GtkActivatableIface

typedef struct {
  GTypeInterface g_iface;

  /* virtual table */
  void   (* update)                   (GtkActivatable *activatable,
		                       GtkAction      *action,
		                       const gchar    *property_name);
  void   (* sync_action_properties)   (GtkActivatable *activatable,
		                       GtkAction      *action);
} GtkActivatableIface;

GTypeInterface g_iface;

update ()

 Called to update the activatable when its related action's properties change. You must check the "use-action-appearance" property only apply action properties that are meant to effect the appearance accordingly.

sync_action_properties ()

 Called to update the activatable completely, this is called internally when "related-action" property is set or unset and by the implementor when "use-action-appearance" changes.

Note

This method can be called with a NULL action at times

Since 2.16

gtk_activatable_do_set_related_action ()

void                gtk_activatable_do_set_related_action
                                                        (GtkActivatable *activatable,
                                                         GtkAction *action);

This is a utility function for GtkActivatable implementors.

When implementing GtkActivatable you must call this when handling changes of the "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

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

activatable :

 a GtkActivatable

action :

 the GtkAction to set

Since 2.16

gtk_activatable_get_related_action ()

GtkAction *         gtk_activatable_get_related_action  (GtkActivatable *activatable);

Gets the related GtkAction for activatable.

activatable :

 a GtkActivatable

Returns :

 the related GtkAction if one is set.

Since 2.16

gtk_activatable_get_use_action_appearance ()

gboolean            gtk_activatable_get_use_action_appearance
                                                        (GtkActivatable *activatable);

Gets whether this activatable should reset its layout and appearance when setting the related action or when the action changes appearance.

activatable :

 a GtkActivatable

Returns :

 whether activatable uses its actions appearance.

Since 2.16

gtk_activatable_sync_action_properties ()

void                gtk_activatable_sync_action_properties
                                                        (GtkActivatable *activatable,
                                                         GtkAction *action);

This is called to update the activatable completely, this is called internally when the "related-action" property is set or unset and by the implementing class when "use-action-appearance" changes.

activatable :

 a GtkActivatable

action :

 the related GtkAction or NULL. allow-none.

Since 2.16

gtk_activatable_set_related_action ()

void                gtk_activatable_set_related_action  (GtkActivatable *activatable,
                                                         GtkAction *action);

Sets the related action on the activatable object.

Note

GtkActivatable implementors need to handle the "related-action" property and call gtk_activatable_do_set_related_action() when it changes.

activatable :

 a GtkActivatable

action :

 the GtkAction to set

Since 2.16

gtk_activatable_set_use_action_appearance ()

void                gtk_activatable_set_use_action_appearance
                                                        (GtkActivatable *activatable,
                                                         gboolean use_appearance);

Sets whether this activatable should reset its layout and appearance when setting the related action or when the action changes appearance

Note

GtkActivatable implementors need to handle the "use-action-appearance" property and call gtk_activatable_sync_action_properties() to update activatable if needed.

activatable :

 a GtkActivatable

use_appearance :

 whether to use the actions appearance

Since 2.16

Property Details

The "related-action" property

  "related-action"           GtkAction*            : Read / Write

The action that this activatable will activate and receive updates from for various states and possibly appearance.

Note

GtkActivatable implementors need to handle the this property and call gtk_activatable_do_set_related_action() when it changes.

Since 2.16

The "use-action-appearance" property

  "use-action-appearance"    gboolean              : Read / Write

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

GtkActivatable implementors need to handle this property and call gtk_activatable_sync_action_properties() on the activatable widget when it changes.

Default value: TRUE

Since 2.16

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