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Libraries:Gtk:Gtk:Activatable

Types

T

Activatable widgets can be connected to a Gtk.Gtk.Action.T and reflects the state of its action. A T 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 T; it is only necessary to implement the T->sync_action_properties() and T->update() methods and chain up to the parent implementation, however when introducing a new T 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 DoSetRelatedAction and SyncActionProperties at the appropriate times.

Example 39. A class fragment implementing T

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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));

  ...
}




ParentT

Constants

InterfaceInfo : Std.Object.T

Nil : T

Functions

GetType() : Gtk.GObject.Type.T



Methods

:DoSetRelatedAction(self @ T, action @ Gtk.Gtk.Action.T) : Std.Object.T

This is a utility function for T implementors.

When implementing T 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 T->update() method is called when the related Gtk.Gtk.Action.T properties change and registers to the action's proxy list.

Note

Be careful to call this before setting the local copy of the Gtk.Gtk.Action.T property, since this function uses gtk_activatable_get_action() to retrieve the previous action



:GetRelatedAction(self @ T) : Gtk.Gtk.Action.T

Gets the related Gtk.Gtk.Action.T for activatable.

activatable a T
Returns the related Gtk.Gtk.Action.T if one is set. [transfer none]


:GetUseActionAppearance(self @ T) : Std.Symbol.T

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

activatable a T
Returns whether activatable uses its actions appearance.


:SetRelatedAction(self @ T, action @ Gtk.Gtk.Action.T) : Std.Object.T

Sets the related action on the activatable object.

Note

T implementors need to handle the "related-action" property and call DoSetRelatedAction when it changes.



:SetUseActionAppearance(self @ T, use_appearance @ Std.Symbol.T) : Std.Object.T

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

Note

T implementors need to handle the "use-action-appearance" property and call SyncActionProperties to update activatable if needed.



:SyncActionProperties(self @ T, action @ Gtk.Gtk.Action.T) : Std.Object.T

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 T
action the related Gtk.Gtk.Action.T or NULL. [allow-none]


:SyncActionProperties(_ @ ParentT, _ @ Gtk.Gtk.Action.T)

:Update(_ @ ParentT, _ @ Gtk.Gtk.Action.T, _ @ Std.String.T)

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