Commit 349c1500 authored by Michael Natterer's avatar Michael Natterer 😴
Browse files

app: add a canvas group item which keeps around sub-items

It can draw them all with one call to draw() and returns a union of
their extents via get_extents().
parent 6b302503
......@@ -25,6 +25,8 @@ libappdisplay_a_sources = \
gimpcanvasboundary.h \
gimpcanvascorner.c \
gimpcanvascorner.h \
gimpcanvasgroup.c \
gimpcanvasgroup.h \
gimpcanvasguide.c \
gimpcanvasguide.h \
gimpcanvashandle.c \
......
/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpcanvasgroup.c
* Copyright (C) 2010 Michael Natterer <mitch@gimp.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "display-types.h"
#include "gimpcanvasgroup.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-transform.h"
enum
{
PROP_0
};
typedef struct _GimpCanvasGroupPrivate GimpCanvasGroupPrivate;
struct _GimpCanvasGroupPrivate
{
GList *items;
};
#define GET_PRIVATE(group) \
G_TYPE_INSTANCE_GET_PRIVATE (group, \
GIMP_TYPE_CANVAS_GROUP, \
GimpCanvasGroupPrivate)
/* local function prototypes */
static void gimp_canvas_group_dispose (GObject *object);
static void gimp_canvas_group_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_canvas_group_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_canvas_group_draw (GimpCanvasItem *item,
GimpDisplayShell *shell,
cairo_t *cr);
static GdkRegion * gimp_canvas_group_get_extents (GimpCanvasItem *item,
GimpDisplayShell *shell);
G_DEFINE_TYPE (GimpCanvasGroup, gimp_canvas_group, GIMP_TYPE_CANVAS_ITEM)
#define parent_class gimp_canvas_group_parent_class
static void
gimp_canvas_group_class_init (GimpCanvasGroupClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
object_class->dispose = gimp_canvas_group_dispose;
object_class->set_property = gimp_canvas_group_set_property;
object_class->get_property = gimp_canvas_group_get_property;
item_class->draw = gimp_canvas_group_draw;
item_class->get_extents = gimp_canvas_group_get_extents;
g_type_class_add_private (klass, sizeof (GimpCanvasGroupPrivate));
}
static void
gimp_canvas_group_init (GimpCanvasGroup *group)
{
}
static void
gimp_canvas_group_dispose (GObject *object)
{
GimpCanvasGroupPrivate *private = GET_PRIVATE (object);
if (private->items)
{
g_list_foreach (private->items, (GFunc) g_object_unref, NULL);
g_list_free (private->items);
private->items = NULL;
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gimp_canvas_group_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
/* GimpCanvasGroupPrivate *private = GET_PRIVATE (object); */
switch (property_id)
{
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_canvas_group_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
/* GimpCanvasGroupPrivate *private = GET_PRIVATE (object); */
switch (property_id)
{
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_canvas_group_draw (GimpCanvasItem *item,
GimpDisplayShell *shell,
cairo_t *cr)
{
GimpCanvasGroupPrivate *private = GET_PRIVATE (item);
GList *list;
for (list = private->items; list; list = g_list_next (list))
{
GimpCanvasItem *sub_item = list->data;
gimp_canvas_item_draw (sub_item, shell, cr);
}
}
static GdkRegion *
gimp_canvas_group_get_extents (GimpCanvasItem *item,
GimpDisplayShell *shell)
{
GimpCanvasGroupPrivate *private = GET_PRIVATE (item);
GdkRegion *region = NULL;
GList *list;
for (list = private->items; list; list = g_list_next (list))
{
GimpCanvasItem *sub_item = list->data;
GdkRegion *sub_region = gimp_canvas_item_get_extents (sub_item,
shell);
if (region)
{
gdk_region_union (region, sub_region);
gdk_region_destroy (sub_region);
}
else
{
region = sub_region;
}
}
return region;
}
GimpCanvasItem *
gimp_canvas_group_new (void)
{
return g_object_new (GIMP_TYPE_CANVAS_GROUP, NULL);
}
void
gimp_canvas_group_add_item (GimpCanvasGroup *group,
GimpCanvasItem *item)
{
GimpCanvasGroupPrivate *private;
g_return_if_fail (GIMP_IS_CANVAS_GROUP (group));
g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
g_return_if_fail (GIMP_CANVAS_ITEM (group) != item);
private = GET_PRIVATE (group);
private->items = g_list_append (private->items, g_object_ref (item));
}
/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpcanvasgroup.h
* Copyright (C) 2010 Michael Natterer <mitch@gimp.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __GIMP_CANVAS_GROUP_H__
#define __GIMP_CANVAS_GROUP_H__
#include "gimpcanvasitem.h"
#define GIMP_TYPE_CANVAS_GROUP (gimp_canvas_group_get_type ())
#define GIMP_CANVAS_GROUP(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_CANVAS_GROUP, GimpCanvasGroup))
#define GIMP_CANVAS_GROUP_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_CANVAS_GROUP, GimpCanvasGroupClass))
#define GIMP_IS_CANVAS_GROUP(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_CANVAS_GROUP))
#define GIMP_IS_CANVAS_GROUP_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_CANVAS_GROUP))
#define GIMP_CANVAS_GROUP_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_CANVAS_GROUP, GimpCanvasGroupClass))
typedef struct _GimpCanvasGroup GimpCanvasGroup;
typedef struct _GimpCanvasGroupClass GimpCanvasGroupClass;
struct _GimpCanvasGroup
{
GimpCanvasItem parent_instance;
};
struct _GimpCanvasGroupClass
{
GimpCanvasItemClass parent_class;
};
GType gimp_canvas_group_get_type (void) G_GNUC_CONST;
GimpCanvasItem * gimp_canvas_group_new (void);
void gimp_canvas_group_add_item (GimpCanvasGroup *group,
GimpCanvasItem *item);
#endif /* __GIMP_CANVAS_GROUP_H__ */
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