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gimp/app/display/gimpcanvasgroup.c

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/* 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"
enum
{
PROP_0,
PROP_GROUP_STROKING,
PROP_GROUP_FILLING
};
typedef struct _GimpCanvasGroupPrivate GimpCanvasGroupPrivate;
struct _GimpCanvasGroupPrivate
{
GList *items;
gboolean group_stroking;
gboolean group_filling;
};
#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,
cairo_t *cr);
static cairo_region_t * gimp_canvas_group_get_extents (GimpCanvasItem *item);
static gboolean gimp_canvas_group_hit (GimpCanvasItem *item,
gdouble x,
gdouble y);
static void gimp_canvas_group_child_update (GimpCanvasItem *item,
cairo_region_t *region,
GimpCanvasGroup *group);
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;
item_class->hit = gimp_canvas_group_hit;
g_object_class_install_property (object_class, PROP_GROUP_STROKING,
g_param_spec_boolean ("group-stroking",
NULL, NULL,
FALSE,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_GROUP_FILLING,
g_param_spec_boolean ("group-filling",
NULL, NULL,
FALSE,
GIMP_PARAM_READWRITE));
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_free_full (private->items, (GDestroyNotify) g_object_unref);
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)
{
case PROP_GROUP_STROKING:
private->group_stroking = g_value_get_boolean (value);
break;
case PROP_GROUP_FILLING:
private->group_filling = g_value_get_boolean (value);
break;
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)
{
case PROP_GROUP_STROKING:
g_value_set_boolean (value, private->group_stroking);
break;
case PROP_GROUP_FILLING:
g_value_set_boolean (value, private->group_filling);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_canvas_group_draw (GimpCanvasItem *item,
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, cr);
}
if (private->group_stroking)
_gimp_canvas_item_stroke (item, cr);
if (private->group_filling)
_gimp_canvas_item_fill (item, cr);
}
static cairo_region_t *
gimp_canvas_group_get_extents (GimpCanvasItem *item)
{
GimpCanvasGroupPrivate *private = GET_PRIVATE (item);
cairo_region_t *region = NULL;
GList *list;
for (list = private->items; list; list = g_list_next (list))
{
GimpCanvasItem *sub_item = list->data;
cairo_region_t *sub_region = gimp_canvas_item_get_extents (sub_item);
if (! region)
{
region = sub_region;
}
else if (sub_region)
{
cairo_region_union (region, sub_region);
cairo_region_destroy (sub_region);
}
}
return region;
}
static gboolean
gimp_canvas_group_hit (GimpCanvasItem *item,
gdouble x,
gdouble y)
{
GimpCanvasGroupPrivate *private = GET_PRIVATE (item);
GList *list;
for (list = private->items; list; list = g_list_next (list))
{
if (gimp_canvas_item_hit (list->data, x, y))
return TRUE;
}
return FALSE;
}
static void
gimp_canvas_group_child_update (GimpCanvasItem *item,
cairo_region_t *region,
GimpCanvasGroup *group)
{
if (_gimp_canvas_item_needs_update (GIMP_CANVAS_ITEM (group)))
_gimp_canvas_item_update (GIMP_CANVAS_ITEM (group), region);
}
/* public functions */
GimpCanvasItem *
gimp_canvas_group_new (GimpDisplayShell *shell)
{
g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
return g_object_new (GIMP_TYPE_CANVAS_GROUP,
"shell", shell,
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);
if (private->group_stroking)
gimp_canvas_item_suspend_stroking (item);
if (private->group_filling)
gimp_canvas_item_suspend_filling (item);
private->items = g_list_append (private->items, g_object_ref (item));
if (_gimp_canvas_item_needs_update (GIMP_CANVAS_ITEM (group)))
{
cairo_region_t *region = gimp_canvas_item_get_extents (item);
if (region)
{
_gimp_canvas_item_update (GIMP_CANVAS_ITEM (group), region);
cairo_region_destroy (region);
}
}
g_signal_connect (item, "update",
G_CALLBACK (gimp_canvas_group_child_update),
group);
}
void
gimp_canvas_group_remove_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));
private = GET_PRIVATE (group);
g_return_if_fail (g_list_find (private->items, item));
private->items = g_list_remove (private->items, item);
if (private->group_stroking)
gimp_canvas_item_resume_stroking (item);
if (private->group_filling)
gimp_canvas_item_resume_filling (item);
if (_gimp_canvas_item_needs_update (GIMP_CANVAS_ITEM (group)))
{
cairo_region_t *region = gimp_canvas_item_get_extents (item);
if (region)
{
_gimp_canvas_item_update (GIMP_CANVAS_ITEM (group), region);
cairo_region_destroy (region);
}
}
g_signal_handlers_disconnect_by_func (item,
gimp_canvas_group_child_update,
group);
g_object_unref (item);
}
void
gimp_canvas_group_set_group_stroking (GimpCanvasGroup *group,
gboolean group_stroking)
{
GimpCanvasGroupPrivate *private;
g_return_if_fail (GIMP_IS_CANVAS_GROUP (group));
private = GET_PRIVATE (group);
if (private->group_stroking != group_stroking)
{
GList *list;
gimp_canvas_item_begin_change (GIMP_CANVAS_ITEM (group));
g_object_set (group,
"group-stroking", group_stroking ? TRUE : FALSE,
NULL);
for (list = private->items; list; list = g_list_next (list))
{
if (private->group_stroking)
gimp_canvas_item_suspend_stroking (list->data);
else
gimp_canvas_item_resume_stroking (list->data);
}
gimp_canvas_item_end_change (GIMP_CANVAS_ITEM (group));
}
}
void
gimp_canvas_group_set_group_filling (GimpCanvasGroup *group,
gboolean group_filling)
{
GimpCanvasGroupPrivate *private;
g_return_if_fail (GIMP_IS_CANVAS_GROUP (group));
private = GET_PRIVATE (group);
if (private->group_filling != group_filling)
{
GList *list;
gimp_canvas_item_begin_change (GIMP_CANVAS_ITEM (group));
g_object_set (group,
"group-filling", group_filling ? TRUE : FALSE,
NULL);
for (list = private->items; list; list = g_list_next (list))
{
if (private->group_filling)
gimp_canvas_item_suspend_filling (list->data);
else
gimp_canvas_item_resume_filling (list->data);
}
gimp_canvas_item_end_change (GIMP_CANVAS_ITEM (group));
}
}
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