392 lines
12 KiB
C
392 lines
12 KiB
C
/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* pikacanvasgroup.c
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* Copyright (C) 2010 Michael Natterer <mitch@gimp.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gegl.h>
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#include <gtk/gtk.h>
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#include "libpikabase/pikabase.h"
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#include "libpikamath/pikamath.h"
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#include "display-types.h"
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#include "pikacanvasgroup.h"
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#include "pikadisplayshell.h"
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enum
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{
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PROP_0,
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PROP_GROUP_STROKING,
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PROP_GROUP_FILLING
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};
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struct _PikaCanvasGroupPrivate
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{
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GQueue *items;
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gboolean group_stroking;
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gboolean group_filling;
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};
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/* local function prototypes */
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static void pika_canvas_group_finalize (GObject *object);
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static void pika_canvas_group_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec);
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static void pika_canvas_group_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec);
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static void pika_canvas_group_draw (PikaCanvasItem *item,
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cairo_t *cr);
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static cairo_region_t * pika_canvas_group_get_extents (PikaCanvasItem *item);
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static gboolean pika_canvas_group_hit (PikaCanvasItem *item,
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gdouble x,
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gdouble y);
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static void pika_canvas_group_child_update (PikaCanvasItem *item,
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cairo_region_t *region,
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PikaCanvasGroup *group);
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G_DEFINE_TYPE_WITH_PRIVATE (PikaCanvasGroup, pika_canvas_group,
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PIKA_TYPE_CANVAS_ITEM)
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#define parent_class pika_canvas_group_parent_class
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static void
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pika_canvas_group_class_init (PikaCanvasGroupClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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PikaCanvasItemClass *item_class = PIKA_CANVAS_ITEM_CLASS (klass);
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object_class->finalize = pika_canvas_group_finalize;
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object_class->set_property = pika_canvas_group_set_property;
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object_class->get_property = pika_canvas_group_get_property;
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item_class->draw = pika_canvas_group_draw;
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item_class->get_extents = pika_canvas_group_get_extents;
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item_class->hit = pika_canvas_group_hit;
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g_object_class_install_property (object_class, PROP_GROUP_STROKING,
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g_param_spec_boolean ("group-stroking",
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NULL, NULL,
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FALSE,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_GROUP_FILLING,
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g_param_spec_boolean ("group-filling",
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NULL, NULL,
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FALSE,
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PIKA_PARAM_READWRITE));
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}
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static void
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pika_canvas_group_init (PikaCanvasGroup *group)
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{
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group->priv = pika_canvas_group_get_instance_private (group);
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group->priv->items = g_queue_new ();
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}
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static void
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pika_canvas_group_finalize (GObject *object)
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{
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PikaCanvasGroup *group = PIKA_CANVAS_GROUP (object);
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PikaCanvasItem *item;
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while ((item = g_queue_peek_head (group->priv->items)))
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pika_canvas_group_remove_item (group, item);
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g_queue_free (group->priv->items);
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group->priv->items = NULL;
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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pika_canvas_group_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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PikaCanvasGroup *group = PIKA_CANVAS_GROUP (object);
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switch (property_id)
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{
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case PROP_GROUP_STROKING:
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group->priv->group_stroking = g_value_get_boolean (value);
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break;
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case PROP_GROUP_FILLING:
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group->priv->group_filling = g_value_get_boolean (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static void
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pika_canvas_group_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec)
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{
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PikaCanvasGroup *group = PIKA_CANVAS_GROUP (object);
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switch (property_id)
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{
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case PROP_GROUP_STROKING:
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g_value_set_boolean (value, group->priv->group_stroking);
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break;
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case PROP_GROUP_FILLING:
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g_value_set_boolean (value, group->priv->group_filling);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static void
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pika_canvas_group_draw (PikaCanvasItem *item,
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cairo_t *cr)
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{
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PikaCanvasGroup *group = PIKA_CANVAS_GROUP (item);
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GList *list;
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for (list = group->priv->items->head; list; list = g_list_next (list))
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{
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PikaCanvasItem *sub_item = list->data;
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pika_canvas_item_draw (sub_item, cr);
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}
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if (group->priv->group_stroking)
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_pika_canvas_item_stroke (item, cr);
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if (group->priv->group_filling)
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_pika_canvas_item_fill (item, cr);
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}
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static cairo_region_t *
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pika_canvas_group_get_extents (PikaCanvasItem *item)
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{
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PikaCanvasGroup *group = PIKA_CANVAS_GROUP (item);
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cairo_region_t *region = NULL;
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GList *list;
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for (list = group->priv->items->head; list; list = g_list_next (list))
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{
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PikaCanvasItem *sub_item = list->data;
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cairo_region_t *sub_region = pika_canvas_item_get_extents (sub_item);
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if (! region)
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{
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region = sub_region;
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}
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else if (sub_region)
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{
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cairo_region_union (region, sub_region);
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cairo_region_destroy (sub_region);
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}
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}
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return region;
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}
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static gboolean
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pika_canvas_group_hit (PikaCanvasItem *item,
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gdouble x,
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gdouble y)
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{
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PikaCanvasGroup *group = PIKA_CANVAS_GROUP (item);
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GList *list;
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for (list = group->priv->items->head; list; list = g_list_next (list))
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{
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if (pika_canvas_item_hit (list->data, x, y))
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return TRUE;
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}
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return FALSE;
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}
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static void
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pika_canvas_group_child_update (PikaCanvasItem *item,
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cairo_region_t *region,
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PikaCanvasGroup *group)
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{
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if (_pika_canvas_item_needs_update (PIKA_CANVAS_ITEM (group)))
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_pika_canvas_item_update (PIKA_CANVAS_ITEM (group), region);
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}
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/* public functions */
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PikaCanvasItem *
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pika_canvas_group_new (PikaDisplayShell *shell)
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{
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g_return_val_if_fail (PIKA_IS_DISPLAY_SHELL (shell), NULL);
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return g_object_new (PIKA_TYPE_CANVAS_GROUP,
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"shell", shell,
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NULL);
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}
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void
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pika_canvas_group_add_item (PikaCanvasGroup *group,
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PikaCanvasItem *item)
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{
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g_return_if_fail (PIKA_IS_CANVAS_GROUP (group));
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g_return_if_fail (PIKA_IS_CANVAS_ITEM (item));
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g_return_if_fail (PIKA_CANVAS_ITEM (group) != item);
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if (group->priv->group_stroking)
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pika_canvas_item_suspend_stroking (item);
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if (group->priv->group_filling)
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pika_canvas_item_suspend_filling (item);
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g_queue_push_tail (group->priv->items, g_object_ref (item));
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if (_pika_canvas_item_needs_update (PIKA_CANVAS_ITEM (group)))
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{
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cairo_region_t *region = pika_canvas_item_get_extents (item);
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if (region)
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{
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_pika_canvas_item_update (PIKA_CANVAS_ITEM (group), region);
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cairo_region_destroy (region);
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}
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}
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g_signal_connect (item, "update",
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G_CALLBACK (pika_canvas_group_child_update),
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group);
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}
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void
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pika_canvas_group_remove_item (PikaCanvasGroup *group,
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PikaCanvasItem *item)
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{
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GList *list;
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g_return_if_fail (PIKA_IS_CANVAS_GROUP (group));
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g_return_if_fail (PIKA_IS_CANVAS_ITEM (item));
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list = g_queue_find (group->priv->items, item);
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g_return_if_fail (list != NULL);
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g_queue_delete_link (group->priv->items, list);
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if (group->priv->group_stroking)
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pika_canvas_item_resume_stroking (item);
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if (group->priv->group_filling)
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pika_canvas_item_resume_filling (item);
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if (_pika_canvas_item_needs_update (PIKA_CANVAS_ITEM (group)))
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{
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cairo_region_t *region = pika_canvas_item_get_extents (item);
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if (region)
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{
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_pika_canvas_item_update (PIKA_CANVAS_ITEM (group), region);
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cairo_region_destroy (region);
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}
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}
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g_signal_handlers_disconnect_by_func (item,
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pika_canvas_group_child_update,
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group);
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g_object_unref (item);
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}
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void
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pika_canvas_group_set_group_stroking (PikaCanvasGroup *group,
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gboolean group_stroking)
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{
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g_return_if_fail (PIKA_IS_CANVAS_GROUP (group));
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if (group->priv->group_stroking != group_stroking)
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{
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GList *list;
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pika_canvas_item_begin_change (PIKA_CANVAS_ITEM (group));
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g_object_set (group,
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"group-stroking", group_stroking ? TRUE : FALSE,
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NULL);
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for (list = group->priv->items->head; list; list = g_list_next (list))
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{
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if (group->priv->group_stroking)
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pika_canvas_item_suspend_stroking (list->data);
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else
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pika_canvas_item_resume_stroking (list->data);
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}
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pika_canvas_item_end_change (PIKA_CANVAS_ITEM (group));
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}
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}
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void
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pika_canvas_group_set_group_filling (PikaCanvasGroup *group,
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gboolean group_filling)
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{
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g_return_if_fail (PIKA_IS_CANVAS_GROUP (group));
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if (group->priv->group_filling != group_filling)
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{
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GList *list;
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pika_canvas_item_begin_change (PIKA_CANVAS_ITEM (group));
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g_object_set (group,
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"group-filling", group_filling ? TRUE : FALSE,
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NULL);
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for (list = group->priv->items->head; list; list = g_list_next (list))
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{
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if (group->priv->group_filling)
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pika_canvas_item_suspend_filling (list->data);
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else
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pika_canvas_item_resume_filling (list->data);
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}
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pika_canvas_item_end_change (PIKA_CANVAS_ITEM (group));
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}
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}
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