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gtklistbox: add bind_model()

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gtk_list_box_bind_model() binds a GListModel to a GtkListBox.

This is a first step towards having GListModel support in Gtk. It's not
useful for large models, because GtkListBox always creates all widgets
for all rows.
This commit is contained in:
Lars Uebernickel 2015-02-09 11:49:31 +01:00
parent 9141eeb60e
commit d825249b42
3 changed files with 134 additions and 0 deletions
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2
docs/reference/gtk/gtk3-sections.txt
View File

@ -550,6 +550,8 @@ gtk_list_box_set_header_func
gtk_list_box_set_sort_func
gtk_list_box_drag_highlight_row
gtk_list_box_drag_unhighlight_row
GtkListBoxCreateWidgetFunc
gtk_list_box_bind_model
gtk_list_box_row_new
gtk_list_box_row_changed

112
gtk/gtklistbox.c
View File

@ -99,6 +99,11 @@ typedef struct
int n_visible_rows;
gboolean in_widget;
GListModel *bound_model;
GtkListBoxCreateWidgetFunc create_widget_func;
gpointer create_widget_func_data;
GDestroyNotify create_widget_func_data_destroy;
} GtkListBoxPrivate;
typedef struct
@ -260,6 +265,12 @@ static void gtk_list_box_update_row_styles (GtkListBox *box);
static void gtk_list_box_update_row_style (GtkListBox *box,
GtkListBoxRow *row);
static void gtk_list_box_bound_model_changed (GListModel *list,
guint position,
guint removed,
guint added,
gpointer user_data);
static GParamSpec *properties[LAST_PROPERTY] = { NULL, };
static guint signals[LAST_SIGNAL] = { 0 };
static GParamSpec *row_properties[LAST_ROW_PROPERTY] = { NULL, };
@ -374,6 +385,15 @@ gtk_list_box_finalize (GObject *obj)
g_sequence_free (priv->children);
g_hash_table_unref (priv->header_hash);
if (priv->bound_model)
{
if (priv->create_widget_func_data_destroy)
priv->create_widget_func_data_destroy (priv->create_widget_func_data);
g_signal_handlers_disconnect_by_func (priv->bound_model, gtk_list_box_bound_model_changed, obj);
g_clear_object (&priv->bound_model);
}
G_OBJECT_CLASS (gtk_list_box_parent_class)->finalize (obj);
}
@ -3561,3 +3581,95 @@ gtk_list_box_buildable_interface_init (GtkBuildableIface *iface)
{
iface->add_child = gtk_list_box_buildable_add_child;
}
static void
gtk_list_box_bound_model_changed (GListModel *list,
guint position,
guint removed,
guint added,
gpointer user_data)
{
GtkListBox *box = user_data;
GtkListBoxPrivate *priv = BOX_PRIV (user_data);
gint i;
while (removed--)
{
GtkListBoxRow *row;
row = gtk_list_box_get_row_at_index (box, position);
gtk_widget_destroy (GTK_WIDGET (row));
}
for (i = 0; i < added; i++)
{
GObject *item;
GtkWidget *widget;
item = g_list_model_get_item (list, position + i);
widget = priv->create_widget_func (item, priv->create_widget_func_data);
gtk_widget_show_all (widget);
gtk_list_box_insert (box, widget, position + i);
g_object_unref (item);
}
}
/**
* gtk_list_box_bind_model:
* @box: a #GtkListBox
* @model: (allow-none): the #GListModel to be bound to @box
* @create_widget_func: a function that creates widgets for items
* @user_data: user data passed to @create_widget_func
* @user_data_free_func: function for freeing @user_data
*
* Binds @model to @box.
*
* If @box was already bound to a model, that previous binding is
* destroyed.
*
* The contents of @box are cleared and then filled with widgets that
* represent items from @model. @box is updated whenever @model changes.
* If @model is %NULL, @box is left empty.
*
* It is undefined to add or remove widgets directly (for example, with
* gtk_list_box_insert() or gtk_container_add()) while @box is bound to a
* model.
*
* Since: 3.16
*/
void
gtk_list_box_bind_model (GtkListBox *box,
GListModel *model,
GtkListBoxCreateWidgetFunc create_widget_func,
gpointer user_data,
GDestroyNotify user_data_free_func)
{
GtkListBoxPrivate *priv = BOX_PRIV (box);
g_return_if_fail (GTK_IS_LIST_BOX (box));
g_return_if_fail (model == NULL || G_IS_LIST_MODEL (model));
g_return_if_fail (model == NULL || create_widget_func != NULL);
if (priv->bound_model)
{
if (priv->create_widget_func_data_destroy)
priv->create_widget_func_data_destroy (priv->create_widget_func_data);
g_signal_handlers_disconnect_by_func (priv->bound_model, gtk_list_box_bound_model_changed, box);
g_clear_object (&priv->bound_model);
}
gtk_list_box_forall_internal (GTK_CONTAINER (box), FALSE, (GtkCallback) gtk_widget_destroy, NULL);
if (model == NULL)
return;
priv->bound_model = g_object_ref (model);
priv->create_widget_func = create_widget_func;
priv->create_widget_func_data = user_data;
priv->create_widget_func_data_destroy = user_data_free_func;
g_signal_connect (priv->bound_model, "items-changed", G_CALLBACK (gtk_list_box_bound_model_changed), box);
gtk_list_box_bound_model_changed (model, 0, 0, g_list_model_get_n_items (model), box);
}

20
gtk/gtklistbox.h
View File

@ -169,6 +169,20 @@ typedef void (*GtkListBoxUpdateHeaderFunc) (GtkListBoxRow *row,
GtkListBoxRow *before,
gpointer user_data);
/**
* GtkListBoxCreateWidgetFunc:
* @item: the item from the model for which to create a widget for
*
* Called for list boxes that are bound to a #GListModel with
* gtk_list_box_bind_model() for each item that gets added to the model.
*
* Returns: a #GtkWidget that represents @item
*
* Since: 3.16
*/
typedef GtkWidget * (*GtkListBoxCreateWidgetFunc) (gpointer item,
gpointer user_data);
GDK_AVAILABLE_IN_3_10
GType gtk_list_box_row_get_type (void) G_GNUC_CONST;
GDK_AVAILABLE_IN_3_10
@ -286,6 +300,12 @@ GDK_AVAILABLE_IN_3_10
GtkWidget* gtk_list_box_new (void);
GDK_AVAILABLE_IN_3_16
void gtk_list_box_bind_model (GtkListBox *box,
GListModel *model,
GtkListBoxCreateWidgetFunc create_widget_func,
gpointer user_data,
GDestroyNotify user_data_free_func);
G_END_DECLS