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Add Composite Child machinery and APIs to GtkWidget

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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.
This commit is contained in:
Tristan Van Berkom
2013-03-20 11:56:39 +09:00
parent 64b87824c7
commit 3b7fc8cdc9
7 changed files with 857 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
docs/reference/gtk/gtk3-sections.txt
View File

@ -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

7
gtk/gtk.symbols
View File

@ -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

4
gtk/gtkbuilder.c
View File

@ -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 &lt;template&gt; 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>

9
gtk/gtkbuilder.h
View File

@ -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);

9
gtk/gtktypes.h
View File

@ -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__ */

752
gtk/gtkwidget.c
View File

@ -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
* &lt;template&gt; tag as a direct child of the toplevel &lt;interface&gt;
* tag. The &lt;template&gt; 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 &lt;template&gt; tag behaves as if
* it were added to the &lt;object&gt; tag defining @widget itself. You may set
* properties on @widget by inserting &lt;property&gt; tags into the &lt;template&gt;
* tag, and also add &lt;child&gt; tags to add children and extend @widget in the
* normal way you would with &lt;object&gt; tags.
* </para>
* <para>
* Additionally, &lt;object&gt; tags can also be added before and
* after the initial &lt;template&gt; tag in the normal way, allowing
* one to define auxilary objects which might be referenced by other
* widgets declared as children of the &lt;template&gt; 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
@ -10798,6 +10907,81 @@ 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)
{
@ -10806,6 +10990,77 @@ 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);
@ -12603,9 +12858,41 @@ 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;
}
@ -14894,3 +15181,468 @@ 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;
}

73
gtk/gtkwidget.h
View File

@ -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__ */