gtk2/gtk/gtkgizmo.c
Timm Bäder 2be675b538 Add GtkGizmo
GtkGizmo is the easiest possible widget to implement. It does nothing
except give its creator a way to control measure/size-allocate/snapshot,
so it can be used in a variety of use cases.
2017-04-25 20:29:02 +02:00

158 lines
4.9 KiB
C

#include "gtkgizmoprivate.h"
#include "gtkwidgetprivate.h"
#include "gtkcsscustomgadgetprivate.h"
G_DEFINE_TYPE (GtkGizmo, gtk_gizmo, GTK_TYPE_WIDGET);
static void
gtk_gizmo_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
GtkGizmo *self = GTK_GIZMO (widget);
gtk_css_gadget_get_preferred_size (self->gadget,
orientation,
for_size,
minimum, natural,
minimum_baseline, natural_baseline);
}
static void
gtk_gizmo_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkGizmo *self = GTK_GIZMO (widget);
GtkAllocation clip;
GTK_WIDGET_CLASS (gtk_gizmo_parent_class)->size_allocate (widget, allocation);
gtk_css_gadget_allocate (self->gadget,
allocation,
gtk_widget_get_allocated_baseline (widget),
&clip);
gtk_widget_set_clip (widget, &clip);
}
static void
gtk_gizmo_snapshot (GtkWidget *widget,
GtkSnapshot *snapshot)
{
GtkGizmo *self = GTK_GIZMO (widget);
gtk_css_gadget_snapshot (self->gadget, snapshot);
}
static void
gtk_gizmo_measure_contents (GtkCssGadget *gadget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline,
gpointer user_data)
{
GtkGizmo *self = GTK_GIZMO (gtk_css_gadget_get_owner (gadget));
if (self->measure_func)
self->measure_func (self, orientation, for_size,
minimum, natural,
minimum_baseline, natural_baseline);
}
static void
gtk_gizmo_allocate_contents (GtkCssGadget *gadget,
const GtkAllocation *allocation,
int baseline,
GtkAllocation *out_clip,
gpointer user_data)
{
GtkGizmo *self = GTK_GIZMO (gtk_css_gadget_get_owner (gadget));
if (self->allocate_func)
self->allocate_func (self,
allocation,
baseline,
out_clip);
}
static gboolean
gtk_gizmo_snapshot_contents (GtkCssGadget *gadget,
GtkSnapshot *snapshot,
int x,
int y,
int width,
int height,
gpointer user_data)
{
GtkGizmo *self = GTK_GIZMO (gtk_css_gadget_get_owner (gadget));
if (self->snapshot_func)
return self->snapshot_func (self, snapshot);
return FALSE;
}
static void
gtk_gizmo_finalize (GObject *obj)
{
GtkGizmo *self = GTK_GIZMO (obj);
g_clear_object (&self->gadget);
G_OBJECT_CLASS (gtk_gizmo_parent_class)->finalize (obj);
}
static void
gtk_gizmo_class_init (GtkGizmoClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
object_class->finalize = gtk_gizmo_finalize;
widget_class->measure = gtk_gizmo_measure;
widget_class->size_allocate = gtk_gizmo_size_allocate;
widget_class->snapshot = gtk_gizmo_snapshot;
}
static void
gtk_gizmo_init (GtkGizmo *self)
{
gtk_widget_set_has_window (GTK_WIDGET (self), FALSE);
self->gadget = gtk_css_custom_gadget_new_for_node (gtk_widget_get_css_node (GTK_WIDGET (self)),
GTK_WIDGET (self),
gtk_gizmo_measure_contents,
gtk_gizmo_allocate_contents,
gtk_gizmo_snapshot_contents,
NULL,
NULL);
}
GtkWidget *
gtk_gizmo_new (const char *css_name,
GtkGizmoMeasureFunc measure_func,
GtkGizmoAllocateFunc allocate_func,
GtkGizmoSnapshotFunc snapshot_func)
{
GtkGizmo *gizmo = GTK_GIZMO (g_object_new (GTK_TYPE_GIZMO,
"css-name", css_name,
NULL));
gizmo->measure_func = measure_func;
gizmo->allocate_func = allocate_func;
gizmo->snapshot_func = snapshot_func;
return GTK_WIDGET (gizmo);
}