gtk/tests/testwidgetfocus.c

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#include <gtk/gtk.h>
typedef struct _GtkFocusWidget GtkFocusWidget;
typedef struct _GtkFocusWidgetClass GtkFocusWidgetClass;
#define GTK_TYPE_FOCUS_WIDGET (gtk_focus_widget_get_type ())
#define GTK_FOCUS_WIDGET(obj) (G_TYPE_CHECK_INSTANCE_CAST(obj, GTK_TYPE_FOCUS_WIDGET, GtkFocusWidget))
#define GTK_FOCUS_WIDGET_CLASS(cls) (G_TYPE_CHECK_CLASS_CAST(cls, GTK_TYPE_FOCUS_WIDGET, GtkFocusWidgetClass))
#define GTK_IS_FOCUS_WIDGET(obj) (G_TYPE_CHECK_INSTANCE_TYPE(obj, GTK_TYPE_FOCUS_WIDGET))
#define GTK_IS_FOCUS_WIDGET_CLASS(cls) (G_TYPE_CHECK_CLASS_TYPE(cls, GTK_TYPE_FOCUS_WIDGET))
#define GTK_FOCUS_WIDGET_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS(obj, GTK_TYPE_FOCUS_WIDGET, GtkFocusWidgetClass))
#define SPACING 30
struct _GtkFocusWidget
{
GtkWidget parent_instance;
union {
struct {
GtkWidget *child1;
GtkWidget *child2;
GtkWidget *child3;
GtkWidget *child4;
};
GtkWidget* children[4];
};
};
struct _GtkFocusWidgetClass
{
GtkWidgetClass parent_class;
};
GType gtk_focus_widget_get_type (void) G_GNUC_CONST;
G_DEFINE_TYPE(GtkFocusWidget, gtk_focus_widget, GTK_TYPE_WIDGET)
static void
gtk_focus_widget_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
{
GtkFocusWidget *self = GTK_FOCUS_WIDGET (widget);
int child_width = (allocation->width - (3 * SPACING)) / 2;
int child_height = (allocation->height - (3 * SPACING)) / 2;
GtkAllocation child_alloc;
child_alloc.x = SPACING + allocation->x;
child_alloc.y = SPACING + allocation->y;
child_alloc.width = child_width;
child_alloc.height = child_height;
gtk_widget_size_allocate (self->child1, &child_alloc);
child_alloc.x += SPACING + child_width;
gtk_widget_size_allocate (self->child2, &child_alloc);
child_alloc.y += SPACING + child_height;
gtk_widget_size_allocate (self->child4, &child_alloc);
child_alloc.x -= SPACING + child_width;
gtk_widget_size_allocate (self->child3, &child_alloc);
}
static void
gtk_focus_widget_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
GtkFocusWidget *self = GTK_FOCUS_WIDGET (widget);
int min, nat;
int i;
*minimum = 0;
*natural = 0;
for (i = 0; i < 4; i ++)
{
gtk_widget_measure (self->children[i], orientation, for_size,
&min, &nat, NULL, NULL);
*minimum = MAX (*minimum, min);
*natural = MAX (*natural, nat);
}
*minimum *= 2;
*natural *= 2;
*minimum += SPACING * 3;
*natural += SPACING * 3;
}
static void
gtk_focus_widget_snapshot (GtkWidget *widget, GtkSnapshot *snapshot)
{
GtkFocusWidget *self = GTK_FOCUS_WIDGET (widget);
gtk_widget_snapshot_child (widget, self->child1, snapshot);
gtk_widget_snapshot_child (widget, self->child2, snapshot);
gtk_widget_snapshot_child (widget, self->child3, snapshot);
gtk_widget_snapshot_child (widget, self->child4, snapshot);
}
static void
gtk_focus_widget_finalize (GObject *object)
{
GtkFocusWidget *self = GTK_FOCUS_WIDGET (object);
gtk_widget_unparent (self->child1);
gtk_widget_unparent (self->child2);
gtk_widget_unparent (self->child3);
gtk_widget_unparent (self->child4);
G_OBJECT_CLASS (gtk_focus_widget_parent_class)->finalize (object);
}
static void
gtk_focus_widget_init (GtkFocusWidget *self)
{
gtk_widget_set_has_window (GTK_WIDGET (self), FALSE);
self->child1 = gtk_button_new_with_label ("1");
gtk_widget_set_parent (self->child1, GTK_WIDGET (self));
self->child2 = gtk_button_new_with_label ("2");
gtk_widget_set_parent (self->child2, GTK_WIDGET (self));
self->child3 = gtk_button_new_with_label ("3");
gtk_widget_set_parent (self->child3, GTK_WIDGET (self));
self->child4 = gtk_button_new_with_label ("4");
gtk_widget_set_parent (self->child4, GTK_WIDGET (self));
}
static void
gtk_focus_widget_class_init (GtkFocusWidgetClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
object_class->finalize = gtk_focus_widget_finalize;
widget_class->snapshot = gtk_focus_widget_snapshot;
widget_class->measure = gtk_focus_widget_measure;
widget_class->size_allocate = gtk_focus_widget_size_allocate;
}
int
main()
{
GtkWidget *window;
GtkWidget *widget;
gtk_init ();
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
widget = g_object_new (GTK_TYPE_FOCUS_WIDGET, NULL);
gtk_container_add (GTK_CONTAINER (window), widget);
g_signal_connect (window, "delete-event", G_CALLBACK (gtk_main_quit), NULL);
gtk_widget_show (window);
gtk_main ();
}