[gtk+/composite-templates-new: 6/30] Add Composite Child machinery and APIs to GtkWidget
- From: Tristan Van Berkom <tvb src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk+/composite-templates-new: 6/30] Add Composite Child machinery and APIs to GtkWidget
- Date: Sat, 30 Mar 2013 08:47:46 +0000 (UTC)
commit fa42850219ca32e7e7f68bc2b0666e16aa3603f6
Author: Tristan Van Berkom <tristanvb openismus com>
Date: Wed Mar 20 11:56:39 2013 +0900
Add Composite Child machinery and APIs to GtkWidget
This commit implements the needed machinery for GtkWidget
to build it's composite content from GtkBuilder XML and
adds the following API:
o gtk_widget_init_template()
An api to be called in instance initializers of any
GtkWidget subclass that uses template XML to build it's components.
o gtk_widget_class_set_template()
API to associate GtkBuilder XML to a given GtkWidget subclass
o gtk_widget_class_automate_child()
API to declare an object built by GtkBuilder to be associated
with an instance structure offset and automatically set.
o gtk_widget_get_automated_child()
API for bindings to fetch a child declared to be automated by
gtk_widget_class_automate_child(), for the case where bindings
do not generate GObjects under the hood and cannot use structure
offsets to resolve composite object pointers.
o gtk_widget_class_declare_callback[s]()
Declare static functions to be used in signal callbacks from
a given class's template XML
o gtk_widget_class_set_connect_func()
API for bindings to override the signal connection machinery
for a given GtkWidget derived class.
docs/reference/gtk/gtk3-sections.txt | 12 +
gtk/gtk.symbols | 7 +
gtk/gtkbuilder.c | 4 +
gtk/gtkbuilder.h | 9 -
gtk/gtktypes.h | 9 +
gtk/gtkwidget.c | 752 ++++++++++++++++++++++++++++++++++
gtk/gtkwidget.h | 73 ++++
7 files changed, 857 insertions(+), 9 deletions(-)
---
diff --git a/docs/reference/gtk/gtk3-sections.txt b/docs/reference/gtk/gtk3-sections.txt
index 2098369..b752b04 100644
--- a/docs/reference/gtk/gtk3-sections.txt
+++ b/docs/reference/gtk/gtk3-sections.txt
@@ -5385,6 +5385,18 @@ gtk_widget_set_vexpand_set
gtk_widget_queue_compute_expand
gtk_widget_compute_expand
+<SUBSECTION Templates>
+gtk_widget_init_template
+gtk_widget_class_set_template
+gtk_widget_class_set_template_from_resource
+gtk_widget_get_automated_child
+gtk_widget_class_bind_child
+gtk_widget_class_bind_child_internal
+gtk_widget_class_automate_child
+gtk_widget_class_bind_callback
+gtk_widget_class_declare_callback
+gtk_widget_class_set_connect_func
+
<SUBSECTION Standard>
GTK_WIDGET
GTK_IS_WIDGET
diff --git a/gtk/gtk.symbols b/gtk/gtk.symbols
index 31a2a8b..1937f11 100644
--- a/gtk/gtk.symbols
+++ b/gtk/gtk.symbols
@@ -3691,6 +3691,8 @@ gtk_widget_add_tick_callback
gtk_widget_can_activate_accel
gtk_widget_child_focus
gtk_widget_child_notify
+gtk_widget_class_automate_child
+gtk_widget_class_declare_callback
gtk_widget_class_find_style_property
gtk_widget_class_install_style_property
gtk_widget_class_install_style_property_parser
@@ -3698,6 +3700,9 @@ gtk_widget_class_list_style_properties
gtk_widget_class_path
gtk_widget_class_set_accessible_role
gtk_widget_class_set_accessible_type
+gtk_widget_class_set_signal_connect_func
+gtk_widget_class_set_template
+gtk_widget_class_set_template_from_resource
gtk_widget_compute_expand
gtk_widget_create_pango_context
gtk_widget_create_pango_layout
@@ -3715,6 +3720,7 @@ gtk_widget_get_allocated_width
gtk_widget_get_allocation
gtk_widget_get_ancestor
gtk_widget_get_app_paintable
+gtk_widget_get_automated_child
gtk_widget_get_can_default
gtk_widget_get_can_focus
gtk_widget_get_child_requisition
@@ -3792,6 +3798,7 @@ gtk_widget_help_type_get_type
gtk_widget_hide
gtk_widget_hide_on_delete
gtk_widget_in_destruction
+gtk_widget_init_template
gtk_widget_input_shape_combine_region
gtk_widget_intersect
gtk_widget_is_ancestor
diff --git a/gtk/gtkbuilder.c b/gtk/gtkbuilder.c
index 7e08802..7079322 100644
--- a/gtk/gtkbuilder.c
+++ b/gtk/gtkbuilder.c
@@ -216,6 +216,10 @@
* <link linkend="GtkFileFilter-BUILDER-UI">GtkFileFilter</link>,
* <link linkend="GtkTextTagTable-BUILDER-UI">GtkTextTagTable</link>.
* </para>
+ * <para>
+ * Additionally, since 3.10 a special <template> tag has been added to the format
+ * allowing one to <link linkend="GtkWidget-BUILDER-TEMPLATES">define a widget class's components</link>.
+ * </para>
* </refsect2>
* <refsect2>
* <title>Embedding other XML</title>
diff --git a/gtk/gtkbuilder.h b/gtk/gtkbuilder.h
index f002353..7f5cb15 100644
--- a/gtk/gtkbuilder.h
+++ b/gtk/gtkbuilder.h
@@ -36,7 +36,6 @@ G_BEGIN_DECLS
#define GTK_BUILDER_ERROR (gtk_builder_error_quark ())
-typedef struct _GtkBuilder GtkBuilder;
typedef struct _GtkBuilderClass GtkBuilderClass;
typedef struct _GtkBuilderPrivate GtkBuilderPrivate;
@@ -108,14 +107,6 @@ struct _GtkBuilderClass
void (*_gtk_reserved8) (void);
};
-typedef void (*GtkBuilderConnectFunc) (GtkBuilder *builder,
- GObject *object,
- const gchar *signal_name,
- const gchar *handler_name,
- GObject *connect_object,
- GConnectFlags flags,
- gpointer user_data);
-
GType gtk_builder_get_type (void) G_GNUC_CONST;
GtkBuilder* gtk_builder_new (void);
diff --git a/gtk/gtktypes.h b/gtk/gtktypes.h
index ed93bc5..f1b645a 100644
--- a/gtk/gtktypes.h
+++ b/gtk/gtktypes.h
@@ -32,6 +32,7 @@
G_BEGIN_DECLS
typedef struct _GtkAdjustment GtkAdjustment;
+typedef struct _GtkBuilder GtkBuilder;
typedef struct _GtkClipboard GtkClipboard;
typedef struct _GtkIconSet GtkIconSet;
typedef struct _GtkIconSource GtkIconSource;
@@ -51,6 +52,14 @@ typedef gboolean (*GtkRcPropertyParser) (const GParamSpec *pspec,
const GString *rc_string,
GValue *property_value);
+typedef void (*GtkBuilderConnectFunc) (GtkBuilder *builder,
+ GObject *object,
+ const gchar *signal_name,
+ const gchar *handler_name,
+ GObject *connect_object,
+ GConnectFlags flags,
+ gpointer user_data);
+
G_END_DECLS
#endif /* __GTK_TYPES_H__ */
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 382931f..9b76174 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -299,6 +299,69 @@
* </example>
* </para>
* </refsect2>
+ * <refsect2 id="GtkWidget-BUILDER-TEMPLATES">
+ * <title>Building composite widgets from template XML</title>
+ * <para>
+ * GtkWidget exposes some facilities to automate the proceedure
+ * of creating composite widgets using #GtkBuilder interface description
+ * language.
+ * </para>
+ * <para>
+ * To create composite widgets with #GtkBuilder XML, one must associate
+ * the interface description with the widget class at class initialization
+ * time using gtk_widget_class_set_template().
+ * </para>
+ * <para>
+ * The interface description semantics expected in composite template descriptions
+ * is slightly different from regulare #GtkBuilder XML.
+ * </para>
+ * <para>
+ * Unlike regular interface descriptions, gtk_widget_class_set_template() will expect a
+ * <template> tag as a direct child of the toplevel <interface>
+ * tag. The <template> tag must specify the "class" attribute which
+ * must be the type name of the widget. Optionally, the "parent" attribute
+ * may be specified to specify the direct parent type of the widget type, this
+ * is ignored by the GtkBuilder but required for Glade to introspect what kind
+ * of properties and internal children exist for a given type when the actual
+ * type does not exist.
+ * </para>
+ * <para>
+ * The XML which is contained inside the <template> tag behaves as if
+ * it were added to the <object> tag defining @widget itself. You may set
+ * properties on @widget by inserting <property> tags into the <template>
+ * tag, and also add <child> tags to add children and extend @widget in the
+ * normal way you would with <object> tags.
+ * </para>
+ * <para>
+ * Additionally, <object> tags can also be added before and
+ * after the initial <template> tag in the normal way, allowing
+ * one to define auxilary objects which might be referenced by other
+ * widgets declared as children of the <template> tag.
+ * </para>
+ * <para>
+ * <example>
+ * <title>A GtkBuilder Template Definition</title>
+ * <programlisting><![CDATA[
+ * <interface>
+ * <template class="FooWidget" parent="GtkBox">
+ * <property name="orientation">GTK_ORIENTATION_HORIZONTAL</property>
+ * <property name="spacing">4</property>
+ * <child>
+ * <object class="GtkButton" id="hello_button">
+ * <property name="label">Hello World</property>
+ * </object>
+ * </child>
+ * <child>
+ * <object class="GtkButton" id="goodbye_button">
+ * <property name="label">Goodbye World</property>
+ * </object>
+ * </child>
+ * </template>
+ * </interface>
+ * ]]></programlisting>
+ * </example>
+ * </para>
+ * </refsect2>
*/
/* Add flags here that should not be propagated to children. By default,
@@ -312,6 +375,26 @@
#define GTK_STATE_FLAGS_BITS 9
+typedef struct {
+ gchar *name; /* Name of the template automatic child */
+ gboolean internal_child; /* Whether the automatic widget should be exported as an
<internal-child> */
+ gssize offset; /* Instance private data offset where to set the automatic child (or
-1) */
+} AutomaticChildClass;
+
+typedef struct {
+ gchar *callback_name;
+ GCallback callback_symbol;
+} CallbackSymbol;
+
+typedef struct {
+ GBytes *data;
+ GSList *children;
+ GSList *callbacks;
+ GtkBuilderConnectFunc connect_func;
+ gpointer connect_data;
+ GDestroyNotify destroy_notify;
+} GtkWidgetTemplate;
+
struct _GtkWidgetPrivate
{
/* The state of the widget. Needs to be able to hold all GtkStateFlags bits
@@ -415,6 +498,10 @@ struct _GtkWidgetPrivate
/* Animations and other things to update on clock ticks */
GList *tick_callbacks;
+ /* A hash by GType key, containing hash tables by widget name
+ */
+ GHashTable *auto_children;
+
#ifdef G_ENABLE_DEBUG
/* Number of gtk_widget_push_verify_invariants () */
guint verifying_invariants_count;
@@ -425,6 +512,7 @@ struct _GtkWidgetClassPrivate
{
GType accessible_type;
AtkRole accessible_role;
+ GtkWidgetTemplate *template;
};
enum {
@@ -704,6 +792,24 @@ static void gtk_widget_real_adjust_size_allocation (GtkWidget
gint *allocated_pos,
gint *allocated_size);
+/* --- functions dealing with template data structures --- */
+static AutomaticChildClass *automatic_child_class_new (const gchar *name,
+ gboolean internal_child,
+ gssize offset);
+static void automatic_child_class_free (AutomaticChildClass *child_class);
+static CallbackSymbol *callback_symbol_new (const gchar *name,
+ GCallback callback);
+static void callback_symbol_free (CallbackSymbol *callback);
+static void template_data_free (GtkWidgetTemplate *template_data);
+static GHashTable *get_auto_child_hash (GtkWidget *widget,
+ GType type,
+ gboolean create);
+static gboolean setup_automatic_child (GtkWidgetTemplate *template_data,
+ GType class_type,
+ AutomaticChildClass *child_class,
+ GtkWidget *widget,
+ GtkBuilder *builder);
+
static void gtk_widget_set_usize_internal (GtkWidget *widget,
gint width,
gint height,
@@ -811,6 +917,7 @@ gtk_widget_base_class_init (gpointer g_class)
GtkWidgetClass *klass = g_class;
klass->priv = G_TYPE_CLASS_GET_PRIVATE (g_class, GTK_TYPE_WIDGET, GtkWidgetClassPrivate);
+ klass->priv->template = NULL;
}
static void
@@ -3420,6 +3527,8 @@ gtk_widget_base_class_finalize (GtkWidgetClass *klass)
g_param_spec_unref (pspec);
}
g_list_free (list);
+
+ template_data_free (klass->priv->template);
}
static void
@@ -10786,6 +10895,81 @@ gtk_widget_dispose (GObject *object)
G_OBJECT_CLASS (gtk_widget_parent_class)->dispose (object);
}
+#ifdef G_ENABLE_DEBUG
+typedef struct {
+ AutomaticChildClass *child_class;
+ GType widget_type;
+ GObject *object;
+ gboolean did_finalize;
+} FinalizeAssertion;
+
+static void
+finalize_assertion_weak_ref (gpointer data,
+ GObject *where_the_object_was)
+{
+ FinalizeAssertion *assertion = (FinalizeAssertion *)data;
+ assertion->did_finalize = TRUE;
+}
+
+static FinalizeAssertion *
+finalize_assertion_new (GtkWidget *widget,
+ GType widget_type,
+ AutomaticChildClass *child_class)
+{
+ FinalizeAssertion *assertion = NULL;
+ GObject *object;
+
+ object = gtk_widget_get_automated_child (widget, widget_type, child_class->name);
+
+ /* We control the hash table entry, the object should never be NULL
+ */
+ g_assert (object);
+ if (!G_IS_OBJECT (object))
+ g_critical ("Automated component `%s' of class `%s' seems to have been prematurely finalized",
+ child_class->name, g_type_name (widget_type));
+ else
+ {
+ assertion = g_slice_new0 (FinalizeAssertion);
+ assertion->child_class = child_class;
+ assertion->widget_type = widget_type;
+ assertion->object = object;
+
+ g_object_weak_ref (object, finalize_assertion_weak_ref, assertion);
+ }
+
+ return assertion;
+}
+
+static GSList *
+build_finalize_assertion_list (GtkWidget *widget)
+{
+ GType class_type;
+ GtkWidgetClass *class;
+ GSList *l, *list = NULL;
+
+ for (class = GTK_WIDGET_GET_CLASS (widget);
+ GTK_IS_WIDGET_CLASS (class);
+ class = g_type_class_peek_parent (class))
+ {
+ if (!class->priv->template)
+ continue;
+
+ class_type = G_OBJECT_CLASS_TYPE (class);
+
+ for (l = class->priv->template->children; l; l = l->next)
+ {
+ AutomaticChildClass *child_class = l->data;
+ FinalizeAssertion *assertion;
+
+ assertion = finalize_assertion_new (widget, class_type, child_class);
+ list = g_slist_prepend (list, assertion);
+ }
+ }
+
+ return list;
+}
+#endif /* G_ENABLE_DEBUG */
+
static void
gtk_widget_real_destroy (GtkWidget *object)
{
@@ -10794,6 +10978,77 @@ gtk_widget_real_destroy (GtkWidget *object)
GtkWidgetPrivate *priv = widget->priv;
GList *l;
+ if (priv->auto_children)
+ {
+ GType class_type;
+ GtkWidgetClass *class;
+ GSList *l;
+
+#ifdef G_ENABLE_DEBUG
+ GSList *assertions = NULL;
+
+ /* Note, GTK_WIDGET_ASSERT_COMPONENTS is very useful
+ * to catch ref counting bugs, but can only be used in
+ * test cases which simply create and destroy a composite
+ * widget.
+ *
+ * This is because some API can expose components explicitly,
+ * and so we cannot assert that a component is expected to finalize
+ * in a full application ecosystem.
+ */
+ if (g_getenv ("GTK_WIDGET_ASSERT_COMPONENTS") != NULL)
+ assertions = build_finalize_assertion_list (widget);
+#endif /* G_ENABLE_DEBUG */
+
+ /* Release references to all automated children */
+ g_hash_table_destroy (priv->auto_children);
+ priv->auto_children = NULL;
+
+#ifdef G_ENABLE_DEBUG
+ for (l = assertions; l; l = l->next)
+ {
+ FinalizeAssertion *assertion = l->data;
+
+ if (!assertion->did_finalize)
+ g_critical ("Automated component `%s' of class `%s' did not finalize in gtk_widget_destroy(). "
+ "Current reference count is %d",
+ assertion->child_class->name,
+ g_type_name (assertion->widget_type),
+ assertion->object->ref_count);
+
+ g_slice_free (FinalizeAssertion, assertion);
+ }
+ g_slist_free (assertions);
+#endif /* G_ENABLE_DEBUG */
+
+ /* Set any automatic private data pointers to NULL */
+ for (class = GTK_WIDGET_GET_CLASS (widget);
+ GTK_IS_WIDGET_CLASS (class);
+ class = g_type_class_peek_parent (class))
+ {
+ if (!class->priv->template)
+ continue;
+
+ class_type = G_OBJECT_CLASS_TYPE (class);
+
+ for (l = class->priv->template->children; l; l = l->next)
+ {
+ AutomaticChildClass *child_class = l->data;
+
+ if (child_class->offset >= 0)
+ {
+ gpointer class_private;
+ GObject **destination;
+
+ /* Nullify instance private data for internal children */
+ class_private = G_TYPE_INSTANCE_GET_PRIVATE (widget, class_type, gpointer);
+ destination = G_STRUCT_MEMBER_P (class_private, child_class->offset);
+ *destination = NULL;
+ }
+ }
+ }
+ }
+
if (GTK_WIDGET_GET_CLASS (widget)->priv->accessible_type != GTK_TYPE_ACCESSIBLE)
{
GtkAccessible *accessible = g_object_steal_qdata (G_OBJECT (widget), quark_accessible_object);
@@ -12587,9 +12842,41 @@ gtk_widget_buildable_get_internal_child (GtkBuildable *buildable,
GtkBuilder *builder,
const gchar *childname)
{
+ GtkWidgetClass *class;
+ GSList *l;
+ GType internal_child_type = 0;
+
if (strcmp (childname, "accessible") == 0)
return G_OBJECT (gtk_widget_get_accessible (GTK_WIDGET (buildable)));
+ /* Find a widget type which has declared an automated child as internal by
+ * the name 'childname', if any.
+ */
+ for (class = GTK_WIDGET_GET_CLASS (buildable);
+ GTK_IS_WIDGET_CLASS (class);
+ class = g_type_class_peek_parent (class))
+ {
+ GtkWidgetTemplate *template = class->priv->template;
+
+ if (!template)
+ continue;
+
+ for (l = template->children; l && internal_child_type == 0; l = l->next)
+ {
+ AutomaticChildClass *child_class = l->data;
+
+ if (child_class->internal_child && strcmp (childname, child_class->name) == 0)
+ internal_child_type = G_OBJECT_CLASS_TYPE (class);
+ }
+ }
+
+ /* Now return the 'internal-child' from the class which declared it, note
+ * that gtk_widget_get_automated_child() an API used to access objects
+ * which are in the private scope of a given class.
+ */
+ if (internal_child_type != 0)
+ return gtk_widget_get_automated_child (GTK_WIDGET (buildable), internal_child_type, childname);
+
return NULL;
}
@@ -14877,3 +15164,468 @@ gtk_widget_insert_action_group (GtkWidget *widget,
else
g_action_muxer_remove (muxer, name);
}
+
+/****************************************************************
+ * GtkBuilder automated templates *
+ ****************************************************************/
+static AutomaticChildClass *
+automatic_child_class_new (const gchar *name,
+ gboolean internal_child,
+ gssize offset)
+{
+ AutomaticChildClass *child_class = g_slice_new0 (AutomaticChildClass);
+
+ child_class->name = g_strdup (name);
+ child_class->internal_child = internal_child;
+ child_class->offset = offset;
+
+ return child_class;
+}
+
+static void
+automatic_child_class_free (AutomaticChildClass *child_class)
+{
+ if (child_class)
+ {
+ g_free (child_class->name);
+ g_slice_free (AutomaticChildClass, child_class);
+ }
+}
+
+static CallbackSymbol *
+callback_symbol_new (const gchar *name,
+ GCallback callback)
+{
+ CallbackSymbol *cb = g_slice_new0 (CallbackSymbol);
+
+ cb->callback_name = g_strdup (name);
+ cb->callback_symbol = callback;
+
+ return cb;
+}
+
+static void
+callback_symbol_free (CallbackSymbol *callback)
+{
+ if (callback)
+ {
+ g_free (callback->callback_name);
+ g_slice_free (CallbackSymbol, callback);
+ }
+}
+
+static void
+template_data_free (GtkWidgetTemplate *template_data)
+{
+ if (template_data)
+ {
+ g_bytes_unref (template_data->data);
+ g_slist_free_full (template_data->children, (GDestroyNotify)automatic_child_class_free);
+ g_slist_free_full (template_data->callbacks, (GDestroyNotify)callback_symbol_free);
+
+ if (template_data->connect_data &&
+ template_data->destroy_notify)
+ template_data->destroy_notify (template_data->connect_data);
+
+ g_slice_free (GtkWidgetTemplate, template_data);
+ }
+}
+
+static GHashTable *
+get_auto_child_hash (GtkWidget *widget,
+ GType type,
+ gboolean create)
+{
+ GHashTable *auto_child_hash;
+
+ if (widget->priv->auto_children == NULL)
+ {
+ if (!create)
+ return NULL;
+
+ widget->priv->auto_children =
+ g_hash_table_new_full (g_direct_hash,
+ g_direct_equal,
+ NULL,
+ (GDestroyNotify)g_hash_table_destroy);
+ }
+
+ auto_child_hash =
+ g_hash_table_lookup (widget->priv->auto_children, GSIZE_TO_POINTER (type));
+
+ if (!auto_child_hash && create)
+ {
+ auto_child_hash = g_hash_table_new_full (g_str_hash,
+ g_str_equal,
+ NULL,
+ (GDestroyNotify)g_object_unref);
+
+ g_hash_table_insert (widget->priv->auto_children,
+ GSIZE_TO_POINTER (type),
+ auto_child_hash);
+ }
+
+ return auto_child_hash;
+}
+
+static gboolean
+setup_automatic_child (GtkWidgetTemplate *template_data,
+ GType class_type,
+ AutomaticChildClass *child_class,
+ GtkWidget *widget,
+ GtkBuilder *builder)
+{
+ GHashTable *auto_child_hash;
+ GObject *object;
+
+ object = gtk_builder_get_object (builder, child_class->name);
+ if (!object)
+ {
+ g_critical ("Unable to retrieve object '%s' from class template for type '%s' while building a '%s'",
+ child_class->name, g_type_name (class_type), G_OBJECT_TYPE_NAME (widget));
+ return FALSE;
+ }
+
+ /* Insert into the hash so that it can be fetched with
+ * gtk_widget_get_automated_child() and also in automated
+ * implementations of GtkBuildable.get_internal_child()
+ */
+ auto_child_hash = get_auto_child_hash (widget, class_type, TRUE);
+ g_hash_table_insert (auto_child_hash, child_class->name, g_object_ref (object));
+
+ if (child_class->offset >= 0)
+ {
+ gpointer class_private;
+ GObject **destination;
+
+ /* Assign 'object' to the specified offset in the instance private data */
+ class_private = G_TYPE_INSTANCE_GET_PRIVATE (widget, class_type, gpointer);
+ destination = G_STRUCT_MEMBER_P (class_private, child_class->offset);
+ *destination = object;
+ }
+
+ return TRUE;
+}
+
+/**
+ * gtk_widget_init_template:
+ * @widget: a #GtkWidget
+ *
+ * Creates and initializes child widgets defined in templates. This
+ * function must be called in the instance initializer for any
+ * class which assigned itself a template using gtk_widget_class_set_template()
+ *
+ * It is important to call this function in the instance initializer
+ * of a #GtkWidget subclass and not in #GObject.constructed() or
+ * #GObject.constructor() for two reasons.
+ *
+ * One reason is that generally derived widgets will assume that parent
+ * class composite widgets have been created in their instance
+ * initializers.
+ *
+ * Another reason is that when calling g_object_new() on a widget with
+ * composite templates, it's important to build the composite widgets
+ * before the construct properties are set. Properties passed to g_object_new()
+ * should take precedence over properties set in the private template XML.
+ *
+ * Since: 3.10
+ */
+void
+gtk_widget_init_template (GtkWidget *widget)
+{
+ GtkWidgetTemplate *template;
+ GtkBuilder *builder;
+ GError *error = NULL;
+ GObject *object;
+ GSList *l;
+ GType class_type;
+
+ g_return_if_fail (GTK_IS_WIDGET (widget));
+
+ object = G_OBJECT (widget);
+ class_type = G_OBJECT_TYPE (widget);
+
+ template = GTK_WIDGET_GET_CLASS (widget)->priv->template;
+ g_return_if_fail (template != NULL);
+
+ builder = gtk_builder_new ();
+
+ /* Add any callback symbols declared for this GType to the GtkBuilder namespace */
+ for (l = template->callbacks; l; l = l->next)
+ {
+ CallbackSymbol *callback = l->data;
+
+ gtk_builder_add_callback_symbol (builder, callback->callback_name, callback->callback_symbol);
+ }
+
+ /* This will build the template XML as children to the widget instance, also it
+ * will validate that the template is created for the correct GType and assert that
+ * there is no infinate recursion.
+ */
+ if (!_gtk_builder_extend_with_template (builder, widget, class_type,
+ (const gchar *)g_bytes_get_data (template->data, NULL),
+ g_bytes_get_size (template->data),
+ &error))
+ {
+ g_critical ("Error building template class '%s' for an instance of type '%s': %s",
+ g_type_name (class_type), G_OBJECT_TYPE_NAME (object), error->message);
+ g_error_free (error);
+
+ /* This should never happen, if the template XML cannot be built
+ * then it is a critical programming error.
+ */
+ g_object_unref (builder);
+ return;
+ }
+
+ /* Build the automatic child data
+ */
+ for (l = template->children; l; l = l->next)
+ {
+ AutomaticChildClass *child_class = l->data;
+
+ /* This will setup the pointer of an automated child, and cause
+ * it to be available in any GtkBuildable.get_internal_child()
+ * invocations which may follow by reference in child classes.
+ */
+ if (!setup_automatic_child (template,
+ class_type,
+ child_class,
+ widget,
+ builder))
+ {
+ g_object_unref (builder);
+ return;
+ }
+ }
+
+ /* Connect signals. All signal data from a template receive the
+ * template instance as user data automatically.
+ *
+ * A GtkBuilderConnectFunc can be provided to gtk_widget_class_set_signal_connect_func()
+ * in order for templates to be usable by bindings.
+ */
+ if (template->connect_func)
+ gtk_builder_connect_signals_full (builder, template->connect_func, template->connect_data);
+ else
+ gtk_builder_connect_signals (builder, object);
+
+ g_object_unref (builder);
+}
+
+/**
+ * gtk_widget_class_set_template:
+ * @widget_class: A #GtkWidgetClass
+ * @template_bytes: A #GBytes holding the #GtkBuilder XML
+ *
+ * This should be called at class initialization time to specify
+ * the GtkBuilder XML to be used to extend a widget.
+ *
+ * For convenience, gtk_widget_class_set_template_from_resource() is also provided.
+ *
+ * <note><para>Any class that installs templates must call gtk_widget_init_template()
+ * in the widget's instance initializer</para></note>
+ *
+ * Since: 3.10
+ */
+void
+gtk_widget_class_set_template (GtkWidgetClass *widget_class,
+ GBytes *template_bytes)
+{
+ g_return_if_fail (GTK_IS_WIDGET_CLASS (widget_class));
+ g_return_if_fail (widget_class->priv->template == NULL);
+ g_return_if_fail (template_bytes != NULL);
+
+ widget_class->priv->template = g_slice_new0 (GtkWidgetTemplate);
+ widget_class->priv->template->data = g_bytes_ref (template_bytes);
+}
+
+/**
+ * gtk_widget_class_set_template_from_resource:
+ * @widget_class: A #GtkWidgetClass
+ * @resource_name: The name of the resource to load the template from
+ *
+ * A convenience function to call gtk_widget_class_set_template().
+ *
+ * <note><para>Any class that installs templates must call gtk_widget_init_template()
+ * in the widget's instance initializer</para></note>
+ *
+ * Since: 3.10
+ */
+void
+gtk_widget_class_set_template_from_resource (GtkWidgetClass *widget_class,
+ const gchar *resource_name)
+{
+ GError *error = NULL;
+ GBytes *bytes = NULL;
+
+ g_return_if_fail (GTK_IS_WIDGET_CLASS (widget_class));
+ g_return_if_fail (widget_class->priv->template == NULL);
+ g_return_if_fail (resource_name && resource_name[0]);
+
+ /* This is a hack, because class initializers now access resources
+ * and GIR/gtk-doc initializes classes without initializing GTK+,
+ * we ensure that our base resources are registered here and
+ * avoid warnings which building GIRs/documentation.
+ */
+ _gtk_ensure_resources ();
+
+ bytes = g_resources_lookup_data (resource_name, 0, &error);
+ if (!bytes)
+ {
+ g_critical ("Unable to load resource for composite template for type '%s': %s",
+ G_OBJECT_CLASS_NAME (widget_class), error->message);
+ g_error_free (error);
+ return;
+ }
+
+ gtk_widget_class_set_template (widget_class, bytes);
+ g_bytes_unref (bytes);
+}
+
+/**
+ * gtk_widget_class_declare_callback:
+ * @widget_class: A #GtkWidgetClass
+ * @callback_name: The name of the callback as expected in the template XML
+ * @callback_symbol: (scope async): The callback symbol
+ *
+ * Declares a @callback_symbol to handle @callback_name from the template XML
+ * defined for @widget_type. See gtk_builder_add_callback_symbol().
+ *
+ * <note><para>This must be called from a composite widget classes class
+ * initializer after calling gtk_widget_class_set_template()</para></note>
+ *
+ * Since: 3.10
+ */
+void
+gtk_widget_class_declare_callback (GtkWidgetClass *widget_class,
+ const gchar *callback_name,
+ GCallback callback_symbol)
+{
+ CallbackSymbol *cb;
+
+ g_return_if_fail (GTK_IS_WIDGET_CLASS (widget_class));
+ g_return_if_fail (widget_class->priv->template != NULL);
+ g_return_if_fail (callback_name && callback_name[0]);
+ g_return_if_fail (callback_symbol != NULL);
+
+ cb = callback_symbol_new (callback_name, callback_symbol);
+ widget_class->priv->template->callbacks = g_slist_prepend (widget_class->priv->template->callbacks, cb);
+}
+
+/**
+ * gtk_widget_class_set_connect_func:
+ * @widget_class: A #GtkWidgetClass
+ * @connect_func: The #GtkBuilderConnectFunc to use when connecting signals in the class template
+ * @connect_data: The data to pass to @connect_func
+ * @connect_data_destroy: The #GDestroyNotify to free @connect_data, this will only be used at
+ * class finalization time, when no classes of type @widget_type are in use anymore.
+ *
+ * For use in lanuage bindings, this will override the default #GtkBuilderConnectFunc to be
+ * used when parsing GtkBuilder xml from this class's template data.
+ *
+ * <note><para>This must be called from a composite widget classes class
+ * initializer after calling gtk_widget_class_set_template()</para></note>
+ *
+ * Since: 3.10
+ */
+void
+gtk_widget_class_set_connect_func (GtkWidgetClass *widget_class,
+ GtkBuilderConnectFunc connect_func,
+ gpointer connect_data,
+ GDestroyNotify connect_data_destroy)
+{
+ g_return_if_fail (GTK_IS_WIDGET_CLASS (widget_class));
+ g_return_if_fail (widget_class->priv->template != NULL);
+
+ /* Defensive, destroy any previously set data */
+ if (widget_class->priv->template->connect_data &&
+ widget_class->priv->template->destroy_notify)
+ widget_class->priv->template->destroy_notify (widget_class->priv->template->connect_data);
+
+ widget_class->priv->template->connect_func = connect_func;
+ widget_class->priv->template->connect_data = connect_data;
+ widget_class->priv->template->destroy_notify = connect_data_destroy;
+}
+
+/**
+ * gtk_widget_class_automate_child:
+ * @widget_class: A #GtkWidgetClass
+ * @name: The "id" of the child defined in the template XML
+ * @internal_child: Whether the child should be accessible as an "internal-child"
+ * when this class is used in GtkBuilder XML
+ * @struct_offset: The structure offset into the composite widget's instance private structure
+ * where the automated child pointer should be set, or -1 to not assign the pointer.
+ *
+ * Automatically assign an object declared in the class template XML to be set to a location
+ * on a freshly built instance's private data, or alternatively accessible via
gtk_widget_get_automated_child().
+ *
+ * An explicit strong reference will be held automatically for the duration of your
+ * instance's life cycle, it will be released automatically when #GObjectClass.dispose() runs
+ * on your instance and if a @struct_offset that is >= 0 is specified, then the automatic location
+ * in your instance private data will be set to %NULL. You can however access an automated child
+ * pointer the first time your classes #GObjectClass.dispose() runs, or alternatively in
+ * #GtkWidgetClass.destroy().
+ *
+ * If @internal_child is specified, #GtkBuildableIface.get_internal_child() will be automatically
+ * implemented by the #GtkWidget class so there is no need to implement it manually.
+ *
+ * <note><para>This must be called from a composite widget classes class
+ * initializer after calling gtk_widget_class_set_template()</para></note>
+ *
+ * Since: 3.10
+ */
+void
+gtk_widget_class_automate_child (GtkWidgetClass *widget_class,
+ const gchar *name,
+ gboolean internal_child,
+ gssize struct_offset)
+{
+ AutomaticChildClass *child_class;
+
+ g_return_if_fail (GTK_IS_WIDGET_CLASS (widget_class));
+ g_return_if_fail (widget_class->priv->template != NULL);
+ g_return_if_fail (name && name[0]);
+
+ child_class = automatic_child_class_new (name,
+ internal_child,
+ struct_offset);
+ widget_class->priv->template->children =
+ g_slist_prepend (widget_class->priv->template->children, child_class);
+}
+
+/**
+ * gtk_widget_get_automated_child:
+ * @widget: A #GtkWidget
+ * @widget_type: The #GType to get an automated child for
+ * @name: The "id" of the child defined in the template XML
+ *
+ * Fetch an object build from the template XML for @widget_type in this @widget instance.
+ *
+ * This will only report children which were previously declared with gtk_widget_class_automate_child().
+ *
+ * This function is only meant to be called for code which is private to the @widget_type which
+ * declared the child and is meant for language bindings which cannot easily make use
+ * of the GObject structure offsets.
+ *
+ * Returns: (transfer none): The object built in the template XML with the id @name
+ */
+GObject *
+gtk_widget_get_automated_child (GtkWidget *widget,
+ GType widget_type,
+ const gchar *name)
+{
+ GHashTable *auto_child_hash;
+ GObject *ret = NULL;
+
+ g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
+ g_return_val_if_fail (g_type_name (widget_type) != NULL, NULL);
+ g_return_val_if_fail (name && name[0], NULL);
+
+ auto_child_hash = get_auto_child_hash (widget, widget_type, FALSE);
+
+ if (auto_child_hash)
+ ret = g_hash_table_lookup (auto_child_hash, name);
+
+ return ret;
+}
diff --git a/gtk/gtkwidget.h b/gtk/gtkwidget.h
index b026499..3d57dde 100644
--- a/gtk/gtkwidget.h
+++ b/gtk/gtkwidget.h
@@ -943,6 +943,79 @@ GDK_AVAILABLE_IN_3_8
void gtk_widget_remove_tick_callback (GtkWidget *widget,
guint id);
+/**
+ * gtk_widget_class_bind_callback:
+ * @widget_class: a #GtkWidgetClass
+ * @callback: the callback symbol
+ *
+ * Shorthand for gtk_widget_class_declare_callback(), adds a symbol
+ * by it's own name to the @widget_class.
+ *
+ * Since: 3.10
+ */
+#define gtk_widget_class_bind_callback(widget_class, callback) \
+ gtk_widget_class_declare_callback (GTK_WIDGET_CLASS (widget_class), \
+ #callback, G_CALLBACK(callback))
+
+/**
+ * gtk_widget_class_bind_child:
+ * @widget_class: a #GtkWidgetClass
+ * @private_data_type: the type of this widget class's instance private data
+ * @member_name: name of the instance private member on @private_data_type
+ *
+ * Shorthand for gtk_widget_class_automate_child(). This macro assumes that
+ * the @member_name is the name of the component instance to lookup as specified
+ * in the composite template.
+ *
+ * Since: 3.10
+ */
+#define gtk_widget_class_bind_child(widget_class, private_data_type, member_name) \
+ gtk_widget_class_automate_child (widget_class, #member_name, FALSE, \
+ G_STRUCT_OFFSET (private_data_type, member_name))
+
+/**
+ * gtk_widget_class_bind_child_internal:
+ * @widget_class: a #GtkWidgetClass
+ * @private_data_type: the type name of this widget class's instance private data
+ * @member_name: name of the instance private member on @private_data_type
+ *
+ * Shorthand for gtk_widget_class_automate_child(). Essentially the same as
+ * gtk_widget_class_bind_child() except that it will export the child as
+ * an internal child.
+ *
+ * Since: 3.10
+ */
+#define gtk_widget_class_bind_child_internal(widget_class, private_data_type, member_name) \
+ gtk_widget_class_automate_child (widget_class, #member_name, TRUE, \
+ G_STRUCT_OFFSET (private_data_type, member_name))
+
+GDK_AVAILABLE_IN_3_10
+void gtk_widget_init_template (GtkWidget *widget);
+GDK_AVAILABLE_IN_3_10
+GObject *gtk_widget_get_automated_child (GtkWidget *widget,
+ GType widget_type,
+ const gchar *name);
+GDK_AVAILABLE_IN_3_10
+void gtk_widget_class_set_template (GtkWidgetClass *widget_class,
+ GBytes *template_bytes);
+GDK_AVAILABLE_IN_3_10
+void gtk_widget_class_set_template_from_resource (GtkWidgetClass *widget_class,
+ const gchar *resource_name);
+GDK_AVAILABLE_IN_3_10
+void gtk_widget_class_declare_callback (GtkWidgetClass *widget_class,
+ const gchar *callback_name,
+ GCallback callback_symbol);
+GDK_AVAILABLE_IN_3_10
+void gtk_widget_class_set_connect_func (GtkWidgetClass *widget_class,
+ GtkBuilderConnectFunc connect_func,
+ gpointer connect_data,
+ GDestroyNotify connect_data_destroy);
+GDK_AVAILABLE_IN_3_10
+void gtk_widget_class_automate_child (GtkWidgetClass *widget_class,
+ const gchar *name,
+ gboolean internal_child,
+ gssize struct_offset);
+
G_END_DECLS
#endif /* __GTK_WIDGET_H__ */
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