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Add GtkGizmo

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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.
This commit is contained in:
Timm Bäder 2017-04-06 19:17:29 +02:00
parent ae1a606c8b
commit 2be675b538
3 changed files with 219 additions and 2 deletions
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6
gtk/Makefile.am
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@ -575,7 +575,8 @@ gtk_private_h_sources = \
gtkwin32themeprivate.h \
gtkwindowprivate.h \
gtktreemenu.h \
gdkpixbufutilsprivate.h
gdkpixbufutilsprivate.h \
gtkgizmoprivate.h
# GTK+ C sources to build the library from
gtk_base_c_sources = \
@ -937,7 +938,8 @@ gtk_base_c_sources = \
gtkwindowgroup.c \
gtkwin32draw.c \
gtkwin32theme.c \
gdkpixbufutils.c
gdkpixbufutils.c \
gtkgizmo.c
if USE_QUARTZ
gtk_base_c_sources += \

157
gtk/gtkgizmo.c Normal file
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@ -0,0 +1,157 @@
#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);
}

58
gtk/gtkgizmoprivate.h Normal file
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@ -0,0 +1,58 @@
#ifndef __GTK_GIZMO_H__
#define __GTK_GIZMO_H__
#include "gtkwidget.h"
#include "gtkcssgadgetprivate.h"
#include "gtkcsscustomgadgetprivate.h"
#define GTK_TYPE_GIZMO (gtk_gizmo_get_type ())
#define GTK_GIZMO(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_GIZMO, GtkGizmo))
#define GTK_GIZMO_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_GIZMO, GtkGizmoClass))
#define GTK_IS_GIZMO(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_GIZMO))
#define GTK_IS_GIZMO_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_GIZMO))
#define GTK_GIZMO_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_GIZMO, GtkGizmoClass))
typedef struct _GtkGizmo GtkGizmo;
typedef struct _GtkGizmoClass GtkGizmoClass;
typedef void (* GtkGizmoMeasureFunc) (GtkGizmo *gizmo,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline);
typedef void (* GtkGizmoAllocateFunc) (GtkGizmo *gizmo,
const GtkAllocation *allocation,
int baseline,
GtkAllocation *out_clip);
typedef gboolean (* GtkGizmoSnapshotFunc) (GtkGizmo *gizmo,
GtkSnapshot *snapshot);
struct _GtkGizmo
{
GtkWidget parent_instance;
GtkCssGadget *gadget;
GtkGizmoMeasureFunc measure_func;
GtkGizmoAllocateFunc allocate_func;
GtkGizmoSnapshotFunc snapshot_func;
};
struct _GtkGizmoClass
{
GtkWidgetClass parent_class;
};
GType gtk_gizmo_get_type (void) G_GNUC_CONST;
GtkWidget *gtk_gizmo_new (const char *css_name,
GtkGizmoMeasureFunc measure_func,
GtkGizmoAllocateFunc allocate_func,
GtkGizmoSnapshotFunc snapshot_func);
#endif