diff options
Diffstat (limited to 'gtk/gtklayoutchild.c')
| -rw-r--r-- | gtk/gtklayoutchild.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/gtk/gtklayoutchild.c b/gtk/gtklayoutchild.c new file mode 100644 index 0000000000..028e80273a --- /dev/null +++ b/gtk/gtklayoutchild.c @@ -0,0 +1,189 @@ +#include "config.h" + +#include "gtklayoutchild.h" + +#include "gtklayoutmanager.h" +#include "gtkprivate.h" + +/** + * SECTION:gtklayoutchild + * @Title: GtkLayoutChild + * @Short_description: An object containing layout properties + * + * #GtkLayoutChild is the base class for objects that are meant to hold + * layout properties. If a #GtkLayoutManager has per-child properties, + * like their packing type, or the horizontal and vertical span, or the + * icon name, then the layout manager should use a #GtkLayoutChild + * implementation to store those properties. + * + * A #GtkLayoutChild instance is only ever valid while a widget is part + * of a layout. + */ + +typedef struct { + GtkLayoutManager *manager; + GtkWidget *widget; +} GtkLayoutChildPrivate; + +G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GtkLayoutChild, gtk_layout_child, G_TYPE_OBJECT) + +enum { + PROP_LAYOUT_MANAGER = 1, + PROP_CHILD_WIDGET, + + N_PROPS +}; + +static GParamSpec *layout_child_properties[N_PROPS]; + +static void +gtk_layout_child_set_property (GObject *gobject, + guint prop_id, + const GValue *value, + GParamSpec *pspec) +{ + GtkLayoutChild *layout_child = GTK_LAYOUT_CHILD (gobject); + GtkLayoutChildPrivate *priv = gtk_layout_child_get_instance_private (layout_child); + + switch (prop_id) + { + case PROP_LAYOUT_MANAGER: + priv->manager = g_value_get_object (value); + break; + + case PROP_CHILD_WIDGET: + priv->widget = g_value_get_object (value); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec); + } +} + +static void +gtk_layout_child_get_property (GObject *gobject, + guint prop_id, + GValue *value, + GParamSpec *pspec) +{ + GtkLayoutChild *layout_child = GTK_LAYOUT_CHILD (gobject); + GtkLayoutChildPrivate *priv = gtk_layout_child_get_instance_private (layout_child); + + switch (prop_id) + { + case PROP_LAYOUT_MANAGER: + g_value_set_object (value, priv->manager); + break; + + case PROP_CHILD_WIDGET: + g_value_set_object (value, priv->widget); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec); + } +} + +static void +gtk_layout_child_constructed (GObject *gobject) +{ + GtkLayoutChild *layout_child = GTK_LAYOUT_CHILD (gobject); + GtkLayoutChildPrivate *priv = gtk_layout_child_get_instance_private (layout_child); + + G_OBJECT_CLASS (gtk_layout_child_parent_class)->constructed (gobject); + + if (priv->manager == NULL) + { + g_critical ("The layout child of type %s does not have " + "the GtkLayoutChild:layout-manager property set", + G_OBJECT_TYPE_NAME (gobject)); + return; + } + + if (priv->widget == NULL) + { + g_critical ("The layout child of type %s does not have " + "the GtkLayoutChild:child-widget property set", + G_OBJECT_TYPE_NAME (gobject)); + return; + } +} + +static void +gtk_layout_child_class_init (GtkLayoutChildClass *klass) +{ + GObjectClass *gobject_class = G_OBJECT_CLASS (klass); + + gobject_class->set_property = gtk_layout_child_set_property; + gobject_class->get_property = gtk_layout_child_get_property; + gobject_class->constructed = gtk_layout_child_constructed; + + /** + * GtkLayoutChild:layout-manager: + * + * The layout manager that created the #GtkLayoutChild instance. + */ + layout_child_properties[PROP_LAYOUT_MANAGER] = + g_param_spec_object ("layout-manager", + "Layout Manager", + "The layout manager that created this object", + GTK_TYPE_LAYOUT_MANAGER, + GTK_PARAM_READWRITE | + G_PARAM_CONSTRUCT_ONLY); + /** + * GtkLayoutChild:child-widget: + * + * The widget that is associated to the #GtkLayoutChild instance. + */ + layout_child_properties[PROP_CHILD_WIDGET] = + g_param_spec_object ("child-widget", + "Child Widget", + "The child widget that is associated to this object", + GTK_TYPE_WIDGET, + GTK_PARAM_READWRITE | + G_PARAM_CONSTRUCT_ONLY); + + g_object_class_install_properties (gobject_class, N_PROPS, layout_child_properties); +} + +static void +gtk_layout_child_init (GtkLayoutChild *self) +{ +} + +/** + * gtk_layout_child_get_layout_manager: + * @layout_child: a #GtkLayoutChild + * + * Retrieves the #GtkLayoutManager instance that created the + * given @layout_child. + * + * Returns: (transfer none): a #GtkLayoutManager + */ +GtkLayoutManager * +gtk_layout_child_get_layout_manager (GtkLayoutChild *layout_child) +{ + GtkLayoutChildPrivate *priv = gtk_layout_child_get_instance_private (layout_child); + + g_return_val_if_fail (GTK_IS_LAYOUT_CHILD (layout_child), NULL); + + return priv->manager; +} + +/** + * gtk_layout_child_get_child_widget: + * @layout_child: a #GtkLayoutChild + * + * Retrieves the #GtkWidget associated to the given @layout_child. + * + * Returns: (transfer none): a #GtkWidget + */ +GtkWidget * +gtk_layout_child_get_child_widget (GtkLayoutChild *layout_child) +{ + GtkLayoutChildPrivate *priv = gtk_layout_child_get_instance_private (layout_child); + + g_return_val_if_fail (GTK_IS_LAYOUT_CHILD (layout_child), NULL); + + return priv->widget; +} |