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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: 8; c-basic-offset: 8 -*- */
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* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation
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* This file is part of the Gnome Library.
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* The Gnome Library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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* The Gnome Library 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 GNU
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* Library General Public License for more details.
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* You should have received a copy of the GNU Library General Public
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* License along with the Gnome Library; see the file COPYING.LIB. If not,
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* write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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* GnomeCanvas widget - Tk-like canvas widget for Gnome
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* GnomeCanvas is basically a port of the Tk toolkit's most excellent canvas widget. Tk is
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* copyrighted by the Regents of the University of California, Sun Microsystems, and other parties.
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* Authors: Federico Mena <federico@nuclecu.unam.mx>
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* Raph Levien <raph@gimp.org>
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* TO-DO list for the canvas:
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* - Allow to specify whether GnomeCanvasImage sizes are in units or pixels (scale or don't scale).
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* - Implement a flag for gnome_canvas_item_reparent() that tells the function to keep the item
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* visually in the same place, that is, to keep it in the same place with respect to the canvas
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* - GC put functions for items.
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* - Widget item (finish it).
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* - GList *gnome_canvas_gimme_all_items_contained_in_this_area (GnomeCanvas *canvas, Rectangle area);
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* - Retrofit all the primitive items with microtile support.
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* - Curve support for line item.
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* - Arc item (Havoc has it; to be integrated in GnomeCanvasEllipse).
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* - Sane font handling API.
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* - Get_arg methods for items:
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* - How to fetch the outline width and know whether it is in pixels or units?
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* Raph's TODO list for the antialiased canvas integration:
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* - ::point() method for text item not accurate when affine transformed.
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* - Clip rectangle not implemented in aa renderer for text item.
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* - Clip paths only partially implemented.
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* - Add more image loading techniques to work around imlib deficiencies.
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#include <gdk/gdkprivate.h>
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#include <gtk/gtkmain.h>
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#include <gtk/gtksignal.h>
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#include "gnome-canvas.h"
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#include "gnome-canvas-i18n.h"
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#include "libart_lgpl/art_rect.h"
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#include "libart_lgpl/art_rect_uta.h"
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#include "libart_lgpl/art_uta_rect.h"
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#include "libart_lgpl/art_uta_ops.h"
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#include "gnome-canvas-marshal.h"
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#include "gnome-canvas-marshal.c"
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/* We must run our idle update handler *before* GDK wants to redraw. */
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#define CANVAS_IDLE_PRIORITY (GDK_PRIORITY_REDRAW - 5)
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static void gnome_canvas_request_update (GnomeCanvas *canvas);
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static void group_add (GnomeCanvasGroup *group,
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GnomeCanvasItem *item);
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static void group_remove (GnomeCanvasGroup *group,
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GnomeCanvasItem *item);
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static void add_idle (GnomeCanvas *canvas);
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/*** GnomeCanvasItem ***/
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/* Some convenience stuff */
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#define GCI_UPDATE_MASK (GNOME_CANVAS_UPDATE_REQUESTED | GNOME_CANVAS_UPDATE_AFFINE | GNOME_CANVAS_UPDATE_CLIP | GNOME_CANVAS_UPDATE_VISIBILITY)
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#define GCI_EPSILON 1e-18
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#define GCI_PRINT_MATRIX(s,a) g_print ("%s %g %g %g %g %g %g\n", s, (a)[0], (a)[1], (a)[2], (a)[3], (a)[4], (a)[5])
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static void gnome_canvas_item_class_init (GnomeCanvasItemClass *class);
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static void gnome_canvas_item_init (GnomeCanvasItem *item);
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static int emit_event (GnomeCanvas *canvas, GdkEvent *event);
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static guint item_signals[ITEM_LAST_SIGNAL];
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static GtkObjectClass *item_parent_class;
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* gnome_canvas_item_get_type:
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* Registers the &GnomeCanvasItem class if necessary, and returns the type ID
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* Return value: The type ID of the &GnomeCanvasItem class.
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gnome_canvas_item_get_type (void)
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static GType canvas_item_type;
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if (!canvas_item_type) {
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static const GTypeInfo object_info = {
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sizeof (GnomeCanvasItemClass),
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(GBaseInitFunc) NULL,
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(GBaseFinalizeFunc) NULL,
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(GClassInitFunc) gnome_canvas_item_class_init,
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(GClassFinalizeFunc) NULL,
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NULL, /* class_data */
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sizeof (GnomeCanvasItem),
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(GInstanceInitFunc) gnome_canvas_item_init,
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NULL /* value_table */
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canvas_item_type = g_type_register_static (GTK_TYPE_OBJECT, "GnomeCanvasItem",
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return canvas_item_type;
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/* Object initialization function for GnomeCanvasItem */
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gnome_canvas_item_init (GnomeCanvasItem *item)
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item->object.flags |= GNOME_CANVAS_ITEM_VISIBLE;
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* gnome_canvas_item_new:
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* @parent: The parent group for the new item.
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* @type: The object type of the item.
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* @first_arg_name: A list of object argument name/value pairs, NULL-terminated,
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* used to configure the item. For example, "fill_color", "black",
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* "width_units", 5.0, NULL.
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* Creates a new canvas item with @parent as its parent group. The item is
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* created at the top of its parent's stack, and starts up as visible. The item
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* is of the specified @type, for example, it can be
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* gnome_canvas_rect_get_type(). The list of object arguments/value pairs is
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* used to configure the item. If you need to pass construct time parameters, you
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* should use g_object_new() to pass the parameters and
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* gnome_canvas_item_construct() to set up the canvas item.
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* Return value: The newly-created item.
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gnome_canvas_item_new (GnomeCanvasGroup *parent, GType type, const gchar *first_arg_name, ...)
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GnomeCanvasItem *item;
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g_return_val_if_fail (GNOME_IS_CANVAS_GROUP (parent), NULL);
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g_return_val_if_fail (g_type_is_a (type, gnome_canvas_item_get_type ()), NULL);
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item = GNOME_CANVAS_ITEM (g_object_new (type, NULL));
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va_start (args, first_arg_name);
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gnome_canvas_item_construct (item, parent, first_arg_name, args);
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/* Performs post-creation operations on a canvas item (adding it to its parent
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item_post_create_setup (GnomeCanvasItem *item)
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group_add (GNOME_CANVAS_GROUP (item->parent), item);
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gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2 + 1, item->y2 + 1);
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item->canvas->need_repick = TRUE;
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/* Set_property handler for canvas items */
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gnome_canvas_item_set_property (GObject *gobject, guint param_id,
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const GValue *value, GParamSpec *pspec)
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GnomeCanvasItem *item;
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g_return_if_fail (GNOME_IS_CANVAS_ITEM (gobject));
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item = GNOME_CANVAS_ITEM (gobject);
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case ITEM_PROP_PARENT:
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if (item->parent != NULL) {
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g_warning ("Cannot set `parent' argument after item has "
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"already been constructed.");
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} else if (g_value_get_object (value)) {
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item->parent = GNOME_CANVAS_ITEM (g_value_get_object (value));
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item->canvas = item->parent->canvas;
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item_post_create_setup (item);
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec);
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/* Get_property handler for canvas items */
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gnome_canvas_item_get_property (GObject *gobject, guint param_id,
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GValue *value, GParamSpec *pspec)
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GnomeCanvasItem *item;
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g_return_if_fail (GNOME_IS_CANVAS_ITEM (gobject));
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item = GNOME_CANVAS_ITEM (gobject);
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case ITEM_PROP_PARENT:
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g_value_set_object (value, item->parent);
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec);
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* gnome_canvas_item_construct:
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* @item: An unconstructed canvas item.
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* @parent: The parent group for the item.
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* @first_arg_name: The name of the first argument for configuring the item.
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* @args: The list of arguments used to configure the item.
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* Constructs a canvas item; meant for use only by item implementations.
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gnome_canvas_item_construct (GnomeCanvasItem *item, GnomeCanvasGroup *parent,
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const gchar *first_arg_name, va_list args)
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g_return_if_fail (GNOME_IS_CANVAS_GROUP (parent));
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g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
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item->parent = GNOME_CANVAS_ITEM (parent);
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item->canvas = item->parent->canvas;
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g_object_set_valist (G_OBJECT (item), first_arg_name, args);
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item_post_create_setup (item);
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/* If the item is visible, requests a redraw of it. */
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redraw_if_visible (GnomeCanvasItem *item)
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if (item->object.flags & GNOME_CANVAS_ITEM_VISIBLE)
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gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2 + 1, item->y2 + 1);
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/* Standard object dispose function for canvas items */
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gnome_canvas_item_dispose (GObject *object)
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GnomeCanvasItem *item;
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g_return_if_fail (GNOME_IS_CANVAS_ITEM (object));
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item = GNOME_CANVAS_ITEM (object);
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redraw_if_visible (item);
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/* Make the canvas forget about us */
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if (item->canvas && item == item->canvas->current_item) {
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item->canvas->current_item = NULL;
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item->canvas->need_repick = TRUE;
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if (item->canvas && item == item->canvas->new_current_item) {
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item->canvas->new_current_item = NULL;
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item->canvas->need_repick = TRUE;
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if (item->canvas && item == item->canvas->grabbed_item) {
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item->canvas->grabbed_item = NULL;
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gdk_pointer_ungrab (GDK_CURRENT_TIME);
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if (item->canvas && item == item->canvas->focused_item)
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item->canvas->focused_item = NULL;
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/* Normal destroy stuff */
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if (item->object.flags & GNOME_CANVAS_ITEM_MAPPED)
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(* GNOME_CANVAS_ITEM_GET_CLASS (item)->unmap) (item);
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if (item->object.flags & GNOME_CANVAS_ITEM_REALIZED)
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(* GNOME_CANVAS_ITEM_GET_CLASS (item)->unrealize) (item);
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group_remove (GNOME_CANVAS_GROUP (item->parent), item);
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g_free (item->xform);
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G_OBJECT_CLASS (item_parent_class)->dispose (object);
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/* items should remove any reference to item->canvas after the
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/* Realize handler for canvas items */
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gnome_canvas_item_realize (GnomeCanvasItem *item)
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GTK_OBJECT_SET_FLAGS (item, GNOME_CANVAS_ITEM_REALIZED);
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gnome_canvas_item_request_update (item);
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/* Unrealize handler for canvas items */
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gnome_canvas_item_unrealize (GnomeCanvasItem *item)
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GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_REALIZED);
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/* Map handler for canvas items */
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gnome_canvas_item_map (GnomeCanvasItem *item)
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GTK_OBJECT_SET_FLAGS (item, GNOME_CANVAS_ITEM_MAPPED);
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/* Unmap handler for canvas items */
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gnome_canvas_item_unmap (GnomeCanvasItem *item)
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GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_MAPPED);
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/* Update handler for canvas items */
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gnome_canvas_item_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
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GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_NEED_UPDATE);
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GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_NEED_AFFINE);
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GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_NEED_CLIP);
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GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_NEED_VIS);
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#define noHACKISH_AFFINE
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* This routine invokes the update method of the item
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* Please notice, that we take parent to canvas pixel matrix as argument
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* unlike virtual method ::update, whose argument is item 2 canvas pixel
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* I will try to force somewhat meaningful naming for affines (Lauris)
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* General naming rule is FROM2TO, where FROM and TO are abbreviations
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* So p2cpx is Parent2CanvasPixel and i2cpx is Item2CanvasPixel
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* I hope that this helps to keep track of what really happens
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gnome_canvas_item_invoke_update (GnomeCanvasItem *item, double *p2cpx, ArtSVP *clip_path, int flags)
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#ifdef HACKISH_AFFINE
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double i2w[6], w2c[6], i2c[6];
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if (!(item->object.flags & GNOME_CANVAS_ITEM_VISIBLE))
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child_flags &= ~GNOME_CANVAS_UPDATE_IS_VISIBLE;
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/* Calculate actual item transformation matrix */
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if (item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL) {
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/* Item has full affine */
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art_affine_multiply (i2cpx, item->xform, p2cpx);
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/* Item has only translation */
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memcpy (i2cpx, p2cpx, 4 * sizeof (gdouble));
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i2cpx[4] = item->xform[0] * p2cpx[0] + item->xform[1] * p2cpx[2] + p2cpx[4];
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i2cpx[5] = item->xform[0] * p2cpx[1] + item->xform[1] * p2cpx[3] + p2cpx[5];
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/* Item has no matrix (i.e. identity) */
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memcpy (i2cpx, p2cpx, 6 * sizeof (gdouble));
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#ifdef HACKISH_AFFINE
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gnome_canvas_item_i2w_affine (item, i2w);
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gnome_canvas_w2c_affine (item->canvas, w2c);
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art_affine_multiply (i2c, i2w, w2c);
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/* invariant (doesn't hold now): child_affine == i2c */
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/* apply object flags to child flags */
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child_flags &= ~GNOME_CANVAS_UPDATE_REQUESTED;
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if (item->object.flags & GNOME_CANVAS_ITEM_NEED_UPDATE)
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child_flags |= GNOME_CANVAS_UPDATE_REQUESTED;
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if (item->object.flags & GNOME_CANVAS_ITEM_NEED_AFFINE)
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child_flags |= GNOME_CANVAS_UPDATE_AFFINE;
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if (item->object.flags & GNOME_CANVAS_ITEM_NEED_CLIP)
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child_flags |= GNOME_CANVAS_UPDATE_CLIP;
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if (item->object.flags & GNOME_CANVAS_ITEM_NEED_VIS)
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child_flags |= GNOME_CANVAS_UPDATE_VISIBILITY;
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if (child_flags & GCI_UPDATE_MASK) {
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if (GNOME_CANVAS_ITEM_GET_CLASS (item)->update)
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GNOME_CANVAS_ITEM_GET_CLASS (item)->update (item, i2cpx, clip_path, child_flags);
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* This routine invokes the point method of the item.
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* The arguments x, y should be in the parent item local coordinates.
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* This is potentially evil, as we are relying on matrix inversion (Lauris)
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gnome_canvas_item_invoke_point (GnomeCanvasItem *item, double x, double y, int cx, int cy, GnomeCanvasItem **actual_item)
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/* Calculate x & y in item local coordinates */
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if (item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL) {
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/* Item has full affine */
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art_affine_invert (p2i, item->xform);
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t = x * p2i[0] + y * p2i[2] + p2i[4];
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y = x * p2i[1] + y * p2i[3] + p2i[5];
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/* Item has only translation */
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#ifdef HACKISH_AFFINE
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double i2w[6], w2c[6], i2c[6], c2i[6];
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#ifdef HACKISH_AFFINE
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gnome_canvas_item_i2w_affine (item, i2w);
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gnome_canvas_w2c_affine (item->canvas, w2c);
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art_affine_multiply (i2c, i2w, w2c);
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art_affine_invert (c2i, i2c);
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art_affine_point (&i, &c, c2i);
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if (GNOME_CANVAS_ITEM_GET_CLASS (item)->point)
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return GNOME_CANVAS_ITEM_GET_CLASS (item)->point (item, x, y, cx, cy, actual_item);
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* gnome_canvas_item_set:
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* @item: A canvas item.
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* @first_arg_name: The list of object argument name/value pairs used to configure the item.
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* Configures a canvas item. The arguments in the item are set to the specified
533
* values, and the item is repainted as appropriate.
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gnome_canvas_item_set (GnomeCanvasItem *item, const gchar *first_arg_name, ...)
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va_start (args, first_arg_name);
541
gnome_canvas_item_set_valist (item, first_arg_name, args);
547
* gnome_canvas_item_set_valist:
548
* @item: A canvas item.
549
* @first_arg_name: The name of the first argument used to configure the item.
550
* @args: The list of object argument name/value pairs used to configure the item.
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* Configures a canvas item. The arguments in the item are set to the specified
553
* values, and the item is repainted as appropriate.
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gnome_canvas_item_set_valist (GnomeCanvasItem *item, const gchar *first_arg_name, va_list args)
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g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
560
g_object_set_valist (G_OBJECT (item), first_arg_name, args);
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/* I commented this out, because item implementations have to schedule update/redraw */
564
redraw_if_visible (item);
567
item->canvas->need_repick = TRUE;
572
* gnome_canvas_item_affine_relative:
573
* @item: A canvas item.
574
* @affine: An affine transformation matrix.
576
* Combines the specified affine transformation matrix with the item's current
577
* transformation. NULL affine is not allowed.
579
#define GCIAR_EPSILON 1e-6
581
gnome_canvas_item_affine_relative (GnomeCanvasItem *item, const double affine[6])
585
g_return_if_fail (item != NULL);
586
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
587
g_return_if_fail (affine != NULL);
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/* Calculate actual item transformation matrix */
592
if (item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL) {
593
/* Item has full affine */
594
art_affine_multiply (i2p, affine, item->xform);
596
/* Item has only translation */
597
memcpy (i2p, affine, 6 * sizeof (gdouble));
598
i2p[4] += item->xform[0];
599
i2p[5] += item->xform[1];
602
/* Item has no matrix (i.e. identity) */
603
memcpy (i2p, affine, 6 * sizeof (gdouble));
606
gnome_canvas_item_affine_absolute (item, i2p);
610
* gnome_canvas_item_affine_absolute:
611
* @item: A canvas item.
612
* @affine: An affine transformation matrix.
614
* Makes the item's affine transformation matrix be equal to the specified
615
* matrix. NULL affine is treated as identity.
618
gnome_canvas_item_affine_absolute (GnomeCanvasItem *item, const double i2p[6])
620
g_return_if_fail (item != NULL);
621
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
624
(fabs (i2p[0] - 1.0) < GCI_EPSILON) &&
625
(fabs (i2p[1] - 0.0) < GCI_EPSILON) &&
626
(fabs (i2p[2] - 0.0) < GCI_EPSILON) &&
627
(fabs (i2p[3] - 1.0) < GCI_EPSILON) &&
628
(fabs (i2p[4] - 0.0) < GCI_EPSILON) &&
629
(fabs (i2p[5] - 0.0) < GCI_EPSILON)) {
630
/* We are identity */
635
if (item->xform && !(item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL)) {
636
/* We do not want to deal with translation-only affines */
637
g_free (item->xform);
640
if (!item->xform) item->xform = g_new (gdouble, 6);
641
memcpy (item->xform, i2p, 6 * sizeof (gdouble));
642
item->object.flags |= GNOME_CANVAS_ITEM_AFFINE_FULL;
645
g_free (item->xform);
650
if (!(item->object.flags & GNOME_CANVAS_ITEM_NEED_AFFINE)) {
652
item->object.flags |= GNOME_CANVAS_ITEM_NEED_AFFINE;
653
gnome_canvas_item_request_update (item);
656
item->canvas->need_repick = TRUE;
661
* gnome_canvas_item_move:
662
* @item: A canvas item.
663
* @dx: Horizontal offset.
664
* @dy: Vertical offset.
666
* Moves a canvas item by creating an affine transformation matrix for
667
* translation by using the specified values. This happens in item
668
* local coordinate system, so if you have nontrivial transform, it
669
* most probably does not do, what you want.
672
gnome_canvas_item_move (GnomeCanvasItem *item, double dx, double dy)
676
g_return_if_fail (item != NULL);
677
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
679
art_affine_translate (translate, dx, dy);
681
gnome_canvas_item_affine_relative (item, translate);
684
/* Convenience function to reorder items in a group's child list. This puts the
685
* specified link after the "before" link. Returns TRUE if the list was changed.
688
put_item_after (GList *link, GList *before)
690
GnomeCanvasGroup *parent;
691
GList *old_before, *old_after;
694
parent = GNOME_CANVAS_GROUP (GNOME_CANVAS_ITEM (link->data)->parent);
697
after = before->next;
699
after = parent->item_list;
701
if (before == link || after == link)
706
old_before = link->prev;
707
old_after = link->next;
710
old_before->next = old_after;
712
parent->item_list = old_after;
715
old_after->prev = old_before;
717
parent->item_list_end = old_before;
725
parent->item_list = link;
731
parent->item_list_end = link;
738
* gnome_canvas_item_raise:
739
* @item: A canvas item.
740
* @positions: Number of steps to raise the item.
742
* Raises the item in its parent's stack by the specified number of positions.
743
* If the number of positions is greater than the distance to the top of the
744
* stack, then the item is put at the top.
747
gnome_canvas_item_raise (GnomeCanvasItem *item, int positions)
749
GList *link, *before;
750
GnomeCanvasGroup *parent;
752
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
753
g_return_if_fail (positions >= 0);
755
if (!item->parent || positions == 0)
758
parent = GNOME_CANVAS_GROUP (item->parent);
759
link = g_list_find (parent->item_list, item);
760
g_assert (link != NULL);
762
for (before = link; positions && before; positions--)
763
before = before->next;
766
before = parent->item_list_end;
768
if (put_item_after (link, before)) {
769
redraw_if_visible (item);
770
item->canvas->need_repick = TRUE;
776
* gnome_canvas_item_lower:
777
* @item: A canvas item.
778
* @positions: Number of steps to lower the item.
780
* Lowers the item in its parent's stack by the specified number of positions.
781
* If the number of positions is greater than the distance to the bottom of the
782
* stack, then the item is put at the bottom.
785
gnome_canvas_item_lower (GnomeCanvasItem *item, int positions)
787
GList *link, *before;
788
GnomeCanvasGroup *parent;
790
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
791
g_return_if_fail (positions >= 1);
793
if (!item->parent || positions == 0)
796
parent = GNOME_CANVAS_GROUP (item->parent);
797
link = g_list_find (parent->item_list, item);
798
g_assert (link != NULL);
801
for (before = link->prev; positions && before; positions--)
802
before = before->prev;
806
if (put_item_after (link, before)) {
807
redraw_if_visible (item);
808
item->canvas->need_repick = TRUE;
814
* gnome_canvas_item_raise_to_top:
815
* @item: A canvas item.
817
* Raises an item to the top of its parent's stack.
820
gnome_canvas_item_raise_to_top (GnomeCanvasItem *item)
823
GnomeCanvasGroup *parent;
825
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
830
parent = GNOME_CANVAS_GROUP (item->parent);
831
link = g_list_find (parent->item_list, item);
832
g_assert (link != NULL);
834
if (put_item_after (link, parent->item_list_end)) {
835
redraw_if_visible (item);
836
item->canvas->need_repick = TRUE;
842
* gnome_canvas_item_lower_to_bottom:
843
* @item: A canvas item.
845
* Lowers an item to the bottom of its parent's stack.
848
gnome_canvas_item_lower_to_bottom (GnomeCanvasItem *item)
851
GnomeCanvasGroup *parent;
853
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
858
parent = GNOME_CANVAS_GROUP (item->parent);
859
link = g_list_find (parent->item_list, item);
860
g_assert (link != NULL);
862
if (put_item_after (link, NULL)) {
863
redraw_if_visible (item);
864
item->canvas->need_repick = TRUE;
870
* gnome_canvas_item_show:
871
* @item: A canvas item.
873
* Shows a canvas item. If the item was already shown, then no action is taken.
876
gnome_canvas_item_show (GnomeCanvasItem *item)
878
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
880
if (!(item->object.flags & GNOME_CANVAS_ITEM_VISIBLE)) {
881
item->object.flags |= GNOME_CANVAS_ITEM_VISIBLE;
882
gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2 + 1, item->y2 + 1);
883
item->canvas->need_repick = TRUE;
889
* gnome_canvas_item_hide:
890
* @item: A canvas item.
892
* Hides a canvas item. If the item was already hidden, then no action is
896
gnome_canvas_item_hide (GnomeCanvasItem *item)
898
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
900
if (item->object.flags & GNOME_CANVAS_ITEM_VISIBLE) {
901
item->object.flags &= ~GNOME_CANVAS_ITEM_VISIBLE;
902
gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2 + 1, item->y2 + 1);
903
item->canvas->need_repick = TRUE;
909
* gnome_canvas_item_grab:
910
* @item: A canvas item.
911
* @event_mask: Mask of events that will be sent to this item.
912
* @cursor: If non-NULL, the cursor that will be used while the grab is active.
913
* @etime: The timestamp required for grabbing the mouse, or GDK_CURRENT_TIME.
915
* Specifies that all events that match the specified event mask should be sent
916
* to the specified item, and also grabs the mouse by calling
917
* gdk_pointer_grab(). The event mask is also used when grabbing the pointer.
918
* If @cursor is not NULL, then that cursor is used while the grab is active.
919
* The @etime parameter is the timestamp required for grabbing the mouse.
921
* Return value: If an item was already grabbed, it returns %GDK_GRAB_ALREADY_GRABBED. If
922
* the specified item was hidden by calling gnome_canvas_item_hide(), then it
923
* returns %GDK_GRAB_NOT_VIEWABLE. Else, it returns the result of calling
924
* gdk_pointer_grab().
927
gnome_canvas_item_grab (GnomeCanvasItem *item, guint event_mask, GdkCursor *cursor, guint32 etime)
931
g_return_val_if_fail (GNOME_IS_CANVAS_ITEM (item), GDK_GRAB_NOT_VIEWABLE);
932
g_return_val_if_fail (GTK_WIDGET_MAPPED (item->canvas), GDK_GRAB_NOT_VIEWABLE);
934
if (item->canvas->grabbed_item)
935
return GDK_GRAB_ALREADY_GRABBED;
937
if (!(item->object.flags & GNOME_CANVAS_ITEM_VISIBLE))
938
return GDK_GRAB_NOT_VIEWABLE;
940
retval = gdk_pointer_grab (item->canvas->layout.bin_window,
947
if (retval != GDK_GRAB_SUCCESS)
950
item->canvas->grabbed_item = item;
951
item->canvas->grabbed_event_mask = event_mask;
952
item->canvas->current_item = item; /* So that events go to the grabbed item */
959
* gnome_canvas_item_ungrab:
960
* @item: A canvas item that holds a grab.
961
* @etime: The timestamp for ungrabbing the mouse.
963
* Ungrabs the item, which must have been grabbed in the canvas, and ungrabs the
967
gnome_canvas_item_ungrab (GnomeCanvasItem *item, guint32 etime)
969
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
971
if (item->canvas->grabbed_item != item)
974
item->canvas->grabbed_item = NULL;
976
gdk_pointer_ungrab (etime);
981
* gnome_canvas_item_i2w_affine:
982
* @item: A canvas item
983
* @affine: An affine transformation matrix (return value).
985
* Gets the affine transform that converts from the item's coordinate system to
989
gnome_canvas_item_i2w_affine (GnomeCanvasItem *item, double affine[6])
991
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
992
g_return_if_fail (affine != NULL);
994
art_affine_identity (affine);
997
if (item->xform != NULL) {
998
if (item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL) {
999
art_affine_multiply (affine, affine, item->xform);
1001
affine[4] += item->xform[0];
1002
affine[5] += item->xform[1];
1006
item = item->parent;
1011
* gnome_canvas_item_w2i:
1012
* @item: A canvas item.
1013
* @x: X coordinate to convert (input/output value).
1014
* @y: Y coordinate to convert (input/output value).
1016
* Converts a coordinate pair from world coordinates to item-relative
1020
gnome_canvas_item_w2i (GnomeCanvasItem *item, double *x, double *y)
1022
double affine[6], inv[6];
1025
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
1026
g_return_if_fail (x != NULL);
1027
g_return_if_fail (y != NULL);
1029
gnome_canvas_item_i2w_affine (item, affine);
1030
art_affine_invert (inv, affine);
1033
art_affine_point (&i, &w, inv);
1040
* gnome_canvas_item_i2w:
1041
* @item: A canvas item.
1042
* @x: X coordinate to convert (input/output value).
1043
* @y: Y coordinate to convert (input/output value).
1045
* Converts a coordinate pair from item-relative coordinates to world
1049
gnome_canvas_item_i2w (GnomeCanvasItem *item, double *x, double *y)
1054
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
1055
g_return_if_fail (x != NULL);
1056
g_return_if_fail (y != NULL);
1058
gnome_canvas_item_i2w_affine (item, affine);
1061
art_affine_point (&w, &i, affine);
1067
* gnome_canvas_item_i2c_affine:
1068
* @item: A canvas item.
1069
* @affine: An affine transformation matrix (return value).
1071
* Gets the affine transform that converts from item-relative coordinates to
1072
* canvas pixel coordinates.
1075
gnome_canvas_item_i2c_affine (GnomeCanvasItem *item, double affine[6])
1077
double i2w[6], w2c[6];
1079
gnome_canvas_item_i2w_affine (item, i2w);
1080
gnome_canvas_w2c_affine (item->canvas, w2c);
1081
art_affine_multiply (affine, i2w, w2c);
1084
/* Returns whether the item is an inferior of or is equal to the parent. */
1086
is_descendant (GnomeCanvasItem *item, GnomeCanvasItem *parent)
1088
for (; item; item = item->parent)
1096
* gnome_canvas_item_reparent:
1097
* @item: A canvas item.
1098
* @new_group: A canvas group.
1100
* Changes the parent of the specified item to be the new group. The item keeps
1101
* its group-relative coordinates as for its old parent, so the item may change
1102
* its absolute position within the canvas.
1105
gnome_canvas_item_reparent (GnomeCanvasItem *item, GnomeCanvasGroup *new_group)
1107
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
1108
g_return_if_fail (GNOME_IS_CANVAS_GROUP (new_group));
1110
/* Both items need to be in the same canvas */
1111
g_return_if_fail (item->canvas == GNOME_CANVAS_ITEM (new_group)->canvas);
1113
/* The group cannot be an inferior of the item or be the item itself --
1114
* this also takes care of the case where the item is the root item of
1116
g_return_if_fail (!is_descendant (GNOME_CANVAS_ITEM (new_group), item));
1118
/* Everything is ok, now actually reparent the item */
1120
g_object_ref (G_OBJECT (item)); /* protect it from the unref in group_remove */
1122
redraw_if_visible (item);
1124
group_remove (GNOME_CANVAS_GROUP (item->parent), item);
1125
item->parent = GNOME_CANVAS_ITEM (new_group);
1126
group_add (new_group, item);
1128
/* Redraw and repick */
1130
redraw_if_visible (item);
1131
item->canvas->need_repick = TRUE;
1133
g_object_unref (G_OBJECT (item));
1137
* gnome_canvas_item_grab_focus:
1138
* @item: A canvas item.
1140
* Makes the specified item take the keyboard focus, so all keyboard events will
1141
* be sent to it. If the canvas widget itself did not have the focus, it grabs
1145
gnome_canvas_item_grab_focus (GnomeCanvasItem *item)
1147
GnomeCanvasItem *focused_item;
1150
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
1151
g_return_if_fail (GTK_WIDGET_CAN_FOCUS (GTK_WIDGET (item->canvas)));
1153
focused_item = item->canvas->focused_item;
1156
ev.focus_change.type = GDK_FOCUS_CHANGE;
1157
ev.focus_change.window = GTK_LAYOUT (item->canvas)->bin_window;
1158
ev.focus_change.send_event = FALSE;
1159
ev.focus_change.in = FALSE;
1161
emit_event (item->canvas, &ev);
1164
item->canvas->focused_item = item;
1165
gtk_widget_grab_focus (GTK_WIDGET (item->canvas));
1168
ev.focus_change.type = GDK_FOCUS_CHANGE;
1169
ev.focus_change.window = GTK_LAYOUT (item->canvas)->bin_window;
1170
ev.focus_change.send_event = FALSE;
1171
ev.focus_change.in = TRUE;
1173
emit_event (item->canvas, &ev);
1179
* gnome_canvas_item_get_bounds:
1180
* @item: A canvas item.
1181
* @x1: Leftmost edge of the bounding box (return value).
1182
* @y1: Upper edge of the bounding box (return value).
1183
* @x2: Rightmost edge of the bounding box (return value).
1184
* @y2: Lower edge of the bounding box (return value).
1186
* Queries the bounding box of a canvas item. The bounds are returned in the
1187
* coordinate system of the item's parent.
1190
gnome_canvas_item_get_bounds (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2)
1192
double tx1, ty1, tx2, ty2;
1193
ArtPoint p1, p2, p3, p4;
1194
ArtPoint q1, q2, q3, q4;
1195
double min_x1, min_y1, min_x2, min_y2;
1196
double max_x1, max_y1, max_x2, max_y2;
1198
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
1200
tx1 = ty1 = tx2 = ty2 = 0.0;
1202
/* Get the item's bounds in its coordinate system */
1204
if (GNOME_CANVAS_ITEM_GET_CLASS (item)->bounds)
1205
(* GNOME_CANVAS_ITEM_GET_CLASS (item)->bounds) (item, &tx1, &ty1, &tx2, &ty2);
1207
/* Make the bounds relative to the item's parent coordinate system */
1209
if (item->xform && (item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL)) {
1215
art_affine_point (&q1, &p1, item->xform);
1216
art_affine_point (&q2, &p2, item->xform);
1217
art_affine_point (&q3, &p3, item->xform);
1218
art_affine_point (&q4, &p4, item->xform);
1252
tx1 = MIN (min_x1, min_x2);
1253
ty1 = MIN (min_y1, min_y2);
1254
tx2 = MAX (max_x1, max_x2);
1255
ty2 = MAX (max_y1, max_y2);
1256
} else if (item->xform) {
1257
tx1 += item->xform[0];
1258
ty1 += item->xform[1];
1259
tx2 += item->xform[0];
1260
ty2 += item->xform[1];
1263
/* Return the values */
1280
* gnome_canvas_item_request_update
1281
* @item: A canvas item.
1283
* To be used only by item implementations. Requests that the canvas queue an
1284
* update for the specified item.
1287
gnome_canvas_item_request_update (GnomeCanvasItem *item)
1289
if (item->object.flags & GNOME_CANVAS_ITEM_NEED_UPDATE)
1292
item->object.flags |= GNOME_CANVAS_ITEM_NEED_UPDATE;
1294
if (item->parent != NULL) {
1295
/* Recurse up the tree */
1296
gnome_canvas_item_request_update (item->parent);
1298
/* Have reached the top of the tree, make sure the update call gets scheduled. */
1299
gnome_canvas_request_update (item->canvas);
1303
/*** GnomeCanvasGroup ***/
1313
static void gnome_canvas_group_class_init (GnomeCanvasGroupClass *class);
1314
static void gnome_canvas_group_init (GnomeCanvasGroup *group);
1315
static void gnome_canvas_group_set_property(GObject *object,
1317
const GValue *value,
1319
static void gnome_canvas_group_get_property(GObject *object,
1324
static void gnome_canvas_group_destroy (GtkObject *object);
1326
static void gnome_canvas_group_update (GnomeCanvasItem *item, double *affine,
1327
ArtSVP *clip_path, int flags);
1328
static void gnome_canvas_group_realize (GnomeCanvasItem *item);
1329
static void gnome_canvas_group_unrealize (GnomeCanvasItem *item);
1330
static void gnome_canvas_group_map (GnomeCanvasItem *item);
1331
static void gnome_canvas_group_unmap (GnomeCanvasItem *item);
1332
static void gnome_canvas_group_draw (GnomeCanvasItem *item, GdkDrawable *drawable,
1333
int x, int y, int width, int height);
1334
static double gnome_canvas_group_point (GnomeCanvasItem *item, double x, double y,
1336
GnomeCanvasItem **actual_item);
1337
static void gnome_canvas_group_bounds (GnomeCanvasItem *item, double *x1, double *y1,
1338
double *x2, double *y2);
1339
static void gnome_canvas_group_render (GnomeCanvasItem *item,
1340
GnomeCanvasBuf *buf);
1343
static GnomeCanvasItemClass *group_parent_class;
1347
* gnome_canvas_group_get_type:
1349
* Registers the &GnomeCanvasGroup class if necessary, and returns the type ID
1352
* Return value: The type ID of the &GnomeCanvasGroup class.
1355
gnome_canvas_group_get_type (void)
1357
static GType canvas_group_type;
1359
if (!canvas_group_type) {
1360
static const GTypeInfo object_info = {
1361
sizeof (GnomeCanvasGroupClass),
1362
(GBaseInitFunc) NULL,
1363
(GBaseFinalizeFunc) NULL,
1364
(GClassInitFunc) gnome_canvas_group_class_init,
1365
(GClassFinalizeFunc) NULL,
1366
NULL, /* class_data */
1367
sizeof (GnomeCanvasGroup),
1368
0, /* n_preallocs */
1369
(GInstanceInitFunc) gnome_canvas_group_init,
1370
NULL /* value_table */
1373
canvas_group_type = g_type_register_static (GNOME_TYPE_CANVAS_ITEM, "GnomeCanvasGroup",
1377
return canvas_group_type;
1380
/* Class initialization function for GnomeCanvasGroupClass */
1382
gnome_canvas_group_class_init (GnomeCanvasGroupClass *class)
1384
GObjectClass *gobject_class;
1385
GtkObjectClass *object_class;
1386
GnomeCanvasItemClass *item_class;
1388
gobject_class = (GObjectClass *) class;
1389
object_class = (GtkObjectClass *) class;
1390
item_class = (GnomeCanvasItemClass *) class;
1392
group_parent_class = g_type_class_peek_parent (class);
1394
gobject_class->set_property = gnome_canvas_group_set_property;
1395
gobject_class->get_property = gnome_canvas_group_get_property;
1397
g_object_class_install_property
1398
(gobject_class, GROUP_PROP_X,
1399
g_param_spec_double ("x",
1402
-G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
1403
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
1404
g_object_class_install_property
1405
(gobject_class, GROUP_PROP_Y,
1406
g_param_spec_double ("y",
1409
-G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
1410
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
1412
object_class->destroy = gnome_canvas_group_destroy;
1414
item_class->update = gnome_canvas_group_update;
1415
item_class->realize = gnome_canvas_group_realize;
1416
item_class->unrealize = gnome_canvas_group_unrealize;
1417
item_class->map = gnome_canvas_group_map;
1418
item_class->unmap = gnome_canvas_group_unmap;
1419
item_class->draw = gnome_canvas_group_draw;
1420
item_class->render = gnome_canvas_group_render;
1421
item_class->point = gnome_canvas_group_point;
1422
item_class->bounds = gnome_canvas_group_bounds;
1425
/* Object initialization function for GnomeCanvasGroup */
1427
gnome_canvas_group_init (GnomeCanvasGroup *group)
1435
/* Translate handler for canvas groups */
1437
gnome_canvas_ensure_translate (GnomeCanvasItem *item)
1439
if (item->xform == NULL) {
1440
GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_AFFINE_FULL);
1441
item->xform = g_new (double, 2);
1442
item->xform[0] = 0.0;
1443
item->xform[1] = 0.0;
1445
} else if (item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL) {
1446
return item->xform + 4;
1452
/* Set_property handler for canvas groups */
1454
gnome_canvas_group_set_property (GObject *gobject, guint param_id,
1455
const GValue *value, GParamSpec *pspec)
1457
GnomeCanvasItem *item;
1460
g_return_if_fail (GNOME_IS_CANVAS_GROUP (gobject));
1462
item = GNOME_CANVAS_ITEM (gobject);
1466
xlat = gnome_canvas_ensure_translate (item);
1467
xlat[0] = g_value_get_double (value);
1471
xlat = gnome_canvas_ensure_translate (item);
1472
xlat[1] = g_value_get_double (value);
1476
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec);
1481
/* Get_property handler for canvas groups */
1483
gnome_canvas_group_get_property (GObject *gobject, guint param_id,
1484
GValue *value, GParamSpec *pspec)
1486
GnomeCanvasItem *item;
1488
g_return_if_fail (GNOME_IS_CANVAS_GROUP (gobject));
1490
item = GNOME_CANVAS_ITEM (gobject);
1494
if (item->xform == NULL)
1495
g_value_set_double (value, 0);
1496
else if (GTK_OBJECT (gobject)->flags & GNOME_CANVAS_ITEM_AFFINE_FULL)
1497
g_value_set_double (value, item->xform[4]);
1499
g_value_set_double (value, item->xform[0]);
1503
if (item->xform == NULL)
1504
g_value_set_double (value, 0);
1505
else if (GTK_OBJECT (gobject)->flags & GNOME_CANVAS_ITEM_AFFINE_FULL)
1506
g_value_set_double (value, item->xform[5]);
1508
g_value_set_double (value, item->xform[1]);
1512
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec);
1517
/* Destroy handler for canvas groups */
1519
gnome_canvas_group_destroy (GtkObject *object)
1521
GnomeCanvasGroup *group;
1523
g_return_if_fail (GNOME_IS_CANVAS_GROUP (object));
1525
group = GNOME_CANVAS_GROUP (object);
1527
while (group->item_list) {
1528
// child is unref'ed by the child's group_remove().
1529
gtk_object_destroy (GTK_OBJECT (group->item_list->data));
1532
if (GTK_OBJECT_CLASS (group_parent_class)->destroy)
1533
(* GTK_OBJECT_CLASS (group_parent_class)->destroy) (object);
1536
/* Update handler for canvas groups */
1538
gnome_canvas_group_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
1540
GnomeCanvasGroup *group;
1543
ArtDRect bbox, child_bbox;
1545
group = GNOME_CANVAS_GROUP (item);
1547
(* group_parent_class->update) (item, affine, clip_path, flags);
1554
for (list = group->item_list; list; list = list->next) {
1557
gnome_canvas_item_invoke_update (i, affine, clip_path, flags);
1559
child_bbox.x0 = i->x1;
1560
child_bbox.y0 = i->y1;
1561
child_bbox.x1 = i->x2;
1562
child_bbox.y1 = i->y2;
1563
art_drect_union (&bbox, &bbox, &child_bbox);
1571
/* Realize handler for canvas groups */
1573
gnome_canvas_group_realize (GnomeCanvasItem *item)
1575
GnomeCanvasGroup *group;
1579
group = GNOME_CANVAS_GROUP (item);
1581
for (list = group->item_list; list; list = list->next) {
1584
if (!(i->object.flags & GNOME_CANVAS_ITEM_REALIZED))
1585
(* GNOME_CANVAS_ITEM_GET_CLASS (i)->realize) (i);
1588
(* group_parent_class->realize) (item);
1591
/* Unrealize handler for canvas groups */
1593
gnome_canvas_group_unrealize (GnomeCanvasItem *item)
1595
GnomeCanvasGroup *group;
1599
group = GNOME_CANVAS_GROUP (item);
1601
for (list = group->item_list; list; list = list->next) {
1604
if (i->object.flags & GNOME_CANVAS_ITEM_REALIZED)
1605
(* GNOME_CANVAS_ITEM_GET_CLASS (i)->unrealize) (i);
1608
(* group_parent_class->unrealize) (item);
1611
/* Map handler for canvas groups */
1613
gnome_canvas_group_map (GnomeCanvasItem *item)
1615
GnomeCanvasGroup *group;
1619
group = GNOME_CANVAS_GROUP (item);
1621
for (list = group->item_list; list; list = list->next) {
1624
if (!(i->object.flags & GNOME_CANVAS_ITEM_MAPPED))
1625
(* GNOME_CANVAS_ITEM_GET_CLASS (i)->map) (i);
1628
(* group_parent_class->map) (item);
1631
/* Unmap handler for canvas groups */
1633
gnome_canvas_group_unmap (GnomeCanvasItem *item)
1635
GnomeCanvasGroup *group;
1639
group = GNOME_CANVAS_GROUP (item);
1641
for (list = group->item_list; list; list = list->next) {
1644
if (i->object.flags & GNOME_CANVAS_ITEM_MAPPED)
1645
(* GNOME_CANVAS_ITEM_GET_CLASS (i)->unmap) (i);
1648
(* group_parent_class->unmap) (item);
1651
/* Draw handler for canvas groups */
1653
gnome_canvas_group_draw (GnomeCanvasItem *item, GdkDrawable *drawable,
1654
int x, int y, int width, int height)
1656
GnomeCanvasGroup *group;
1658
GnomeCanvasItem *child = NULL;
1660
group = GNOME_CANVAS_GROUP (item);
1662
for (list = group->item_list; list; list = list->next) {
1665
if (((child->object.flags & GNOME_CANVAS_ITEM_VISIBLE)
1666
&& ((child->x1 < (x + width))
1667
&& (child->y1 < (y + height))
1669
&& (child->y2 > y)))
1670
|| ((GTK_OBJECT_FLAGS (child) & GNOME_CANVAS_ITEM_ALWAYS_REDRAW)
1671
&& (child->x1 < child->canvas->redraw_x2)
1672
&& (child->y1 < child->canvas->redraw_y2)
1673
&& (child->x2 > child->canvas->redraw_x1)
1674
&& (child->y2 > child->canvas->redraw_y2)))
1675
if (GNOME_CANVAS_ITEM_GET_CLASS (child)->draw)
1676
(* GNOME_CANVAS_ITEM_GET_CLASS (child)->draw) (
1677
child, drawable, x, y, width, height);
1681
/* Point handler for canvas groups */
1683
gnome_canvas_group_point (GnomeCanvasItem *item, double x, double y, int cx, int cy,
1684
GnomeCanvasItem **actual_item)
1686
GnomeCanvasGroup *group;
1688
GnomeCanvasItem *child, *point_item;
1694
group = GNOME_CANVAS_GROUP (item);
1696
x1 = cx - item->canvas->close_enough;
1697
y1 = cy - item->canvas->close_enough;
1698
x2 = cx + item->canvas->close_enough;
1699
y2 = cy + item->canvas->close_enough;
1702
*actual_item = NULL;
1707
dist = 0.0; /* keep gcc happy */
1709
for (list = group->item_list; list; list = list->next) {
1712
if ((child->x1 > x2) || (child->y1 > y2) || (child->x2 < x1) || (child->y2 < y1))
1715
point_item = NULL; /* cater for incomplete item implementations */
1717
if ((child->object.flags & GNOME_CANVAS_ITEM_VISIBLE)
1718
&& GNOME_CANVAS_ITEM_GET_CLASS (child)->point) {
1719
dist = gnome_canvas_item_invoke_point (child, gx, gy, cx, cy, &point_item);
1726
&& ((int) (dist * item->canvas->pixels_per_unit + 0.5)
1727
<= item->canvas->close_enough)) {
1729
*actual_item = point_item;
1736
/* Bounds handler for canvas groups */
1738
gnome_canvas_group_bounds (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2)
1740
GnomeCanvasGroup *group;
1741
GnomeCanvasItem *child;
1743
double tx1, ty1, tx2, ty2;
1744
double minx, miny, maxx, maxy;
1747
group = GNOME_CANVAS_GROUP (item);
1749
/* Get the bounds of the first visible item */
1751
child = NULL; /* Unnecessary but eliminates a warning. */
1755
for (list = group->item_list; list; list = list->next) {
1758
if (child->object.flags & GNOME_CANVAS_ITEM_VISIBLE) {
1760
gnome_canvas_item_get_bounds (child, &minx, &miny, &maxx, &maxy);
1765
/* If there were no visible items, return an empty bounding box */
1768
*x1 = *y1 = *x2 = *y2 = 0.0;
1772
/* Now we can grow the bounds using the rest of the items */
1776
for (; list; list = list->next) {
1779
if (!(child->object.flags & GNOME_CANVAS_ITEM_VISIBLE))
1782
gnome_canvas_item_get_bounds (child, &tx1, &ty1, &tx2, &ty2);
1803
/* Render handler for canvas groups */
1805
gnome_canvas_group_render (GnomeCanvasItem *item, GnomeCanvasBuf *buf)
1807
GnomeCanvasGroup *group;
1808
GnomeCanvasItem *child;
1811
group = GNOME_CANVAS_GROUP (item);
1813
for (list = group->item_list; list; list = list->next) {
1816
if (((child->object.flags & GNOME_CANVAS_ITEM_VISIBLE)
1817
&& ((child->x1 < buf->rect.x1)
1818
&& (child->y1 < buf->rect.y1)
1819
&& (child->x2 > buf->rect.x0)
1820
&& (child->y2 > buf->rect.y0)))
1821
|| ((GTK_OBJECT_FLAGS (child) & GNOME_CANVAS_ITEM_ALWAYS_REDRAW)
1822
&& (child->x1 < child->canvas->redraw_x2)
1823
&& (child->y1 < child->canvas->redraw_y2)
1824
&& (child->x2 > child->canvas->redraw_x1)
1825
&& (child->y2 > child->canvas->redraw_y2)))
1826
if (GNOME_CANVAS_ITEM_GET_CLASS (child)->render)
1827
(* GNOME_CANVAS_ITEM_GET_CLASS (child)->render) (
1832
/* Adds an item to a group */
1834
group_add (GnomeCanvasGroup *group, GnomeCanvasItem *item)
1836
g_object_ref (G_OBJECT (item));
1837
gtk_object_sink (GTK_OBJECT (item));
1839
if (!group->item_list) {
1840
group->item_list = g_list_append (group->item_list, item);
1841
group->item_list_end = group->item_list;
1843
group->item_list_end = g_list_append (group->item_list_end, item)->next;
1845
if (group->item.object.flags & GNOME_CANVAS_ITEM_REALIZED)
1846
(* GNOME_CANVAS_ITEM_GET_CLASS (item)->realize) (item);
1848
if (group->item.object.flags & GNOME_CANVAS_ITEM_MAPPED)
1849
(* GNOME_CANVAS_ITEM_GET_CLASS (item)->map) (item);
1851
g_object_notify (G_OBJECT (item), "parent");
1854
/* Removes an item from a group */
1856
group_remove (GnomeCanvasGroup *group, GnomeCanvasItem *item)
1860
g_return_if_fail (GNOME_IS_CANVAS_GROUP (group));
1861
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
1863
for (children = group->item_list; children; children = children->next)
1864
if (children->data == item) {
1865
if (item->object.flags & GNOME_CANVAS_ITEM_MAPPED)
1866
(* GNOME_CANVAS_ITEM_GET_CLASS (item)->unmap) (item);
1868
if (item->object.flags & GNOME_CANVAS_ITEM_REALIZED)
1869
(* GNOME_CANVAS_ITEM_GET_CLASS (item)->unrealize) (item);
1871
/* Unparent the child */
1873
item->parent = NULL;
1874
g_object_unref (G_OBJECT (item));
1876
/* Remove it from the list */
1878
if (children == group->item_list_end)
1879
group->item_list_end = children->prev;
1881
group->item_list = g_list_remove_link (group->item_list, children);
1882
g_list_free (children);
1888
/*** GnomeCanvas ***/
1897
static void gnome_canvas_class_init (GnomeCanvasClass *class);
1898
static void gnome_canvas_init (GnomeCanvas *canvas);
1899
static void gnome_canvas_destroy (GtkObject *object);
1900
static void gnome_canvas_map (GtkWidget *widget);
1901
static void gnome_canvas_unmap (GtkWidget *widget);
1902
static void gnome_canvas_realize (GtkWidget *widget);
1903
static void gnome_canvas_unrealize (GtkWidget *widget);
1904
static void gnome_canvas_size_allocate (GtkWidget *widget,
1905
GtkAllocation *allocation);
1906
static gint gnome_canvas_button (GtkWidget *widget,
1907
GdkEventButton *event);
1908
static gint gnome_canvas_motion (GtkWidget *widget,
1909
GdkEventMotion *event);
1910
static gint gnome_canvas_expose (GtkWidget *widget,
1911
GdkEventExpose *event);
1912
static gboolean gnome_canvas_key (GtkWidget *widget,
1913
GdkEventKey *event);
1914
static gint gnome_canvas_crossing (GtkWidget *widget,
1915
GdkEventCrossing *event);
1916
static gint gnome_canvas_focus_in (GtkWidget *widget,
1917
GdkEventFocus *event);
1918
static gint gnome_canvas_focus_out (GtkWidget *widget,
1919
GdkEventFocus *event);
1920
static void gnome_canvas_request_update_real (GnomeCanvas *canvas);
1921
static void gnome_canvas_draw_background (GnomeCanvas *canvas,
1922
GdkDrawable *drawable,
1929
static GtkLayoutClass *canvas_parent_class;
1931
static guint canvas_signals[LAST_SIGNAL];
1938
* gnome_canvas_get_type:
1940
* Registers the &GnomeCanvas class if necessary, and returns the type ID
1943
* Return value: The type ID of the &GnomeCanvas class.
1946
gnome_canvas_get_type (void)
1948
static GType canvas_type;
1951
static const GTypeInfo object_info = {
1952
sizeof (GnomeCanvasClass),
1953
(GBaseInitFunc) NULL,
1954
(GBaseFinalizeFunc) NULL,
1955
(GClassInitFunc) gnome_canvas_class_init,
1956
(GClassFinalizeFunc) NULL,
1957
NULL, /* class_data */
1958
sizeof (GnomeCanvas),
1959
0, /* n_preallocs */
1960
(GInstanceInitFunc) gnome_canvas_init,
1961
NULL /* value_table */
1964
canvas_type = g_type_register_static (GTK_TYPE_LAYOUT, "GnomeCanvas",
1972
gnome_canvas_get_property (GObject *object,
1979
g_value_set_boolean (value, GNOME_CANVAS (object)->aa);
1982
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1988
gnome_canvas_set_property (GObject *object,
1990
const GValue *value,
1995
GNOME_CANVAS (object)->aa = g_value_get_boolean (value);
1998
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
2003
/* Class initialization function for GnomeCanvasClass */
2005
gnome_canvas_class_init (GnomeCanvasClass *klass)
2007
GObjectClass *gobject_class;
2008
GtkObjectClass *object_class;
2009
GtkWidgetClass *widget_class;
2011
gobject_class = (GObjectClass *)klass;
2012
object_class = (GtkObjectClass *) klass;
2013
widget_class = (GtkWidgetClass *) klass;
2015
canvas_parent_class = g_type_class_peek_parent (klass);
2017
gobject_class->set_property = gnome_canvas_set_property;
2018
gobject_class->get_property = gnome_canvas_get_property;
2020
object_class->destroy = gnome_canvas_destroy;
2022
widget_class->map = gnome_canvas_map;
2023
widget_class->unmap = gnome_canvas_unmap;
2024
widget_class->realize = gnome_canvas_realize;
2025
widget_class->unrealize = gnome_canvas_unrealize;
2026
widget_class->size_allocate = gnome_canvas_size_allocate;
2027
widget_class->button_press_event = gnome_canvas_button;
2028
widget_class->button_release_event = gnome_canvas_button;
2029
widget_class->motion_notify_event = gnome_canvas_motion;
2030
widget_class->expose_event = gnome_canvas_expose;
2031
widget_class->key_press_event = gnome_canvas_key;
2032
widget_class->key_release_event = gnome_canvas_key;
2033
widget_class->enter_notify_event = gnome_canvas_crossing;
2034
widget_class->leave_notify_event = gnome_canvas_crossing;
2035
widget_class->focus_in_event = gnome_canvas_focus_in;
2036
widget_class->focus_out_event = gnome_canvas_focus_out;
2038
klass->draw_background = gnome_canvas_draw_background;
2039
klass->render_background = NULL;
2040
klass->request_update = gnome_canvas_request_update_real;
2042
g_object_class_install_property (G_OBJECT_CLASS (object_class),
2044
g_param_spec_boolean ("aa",
2046
"The antialiasing mode of the canvas.",
2048
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
2050
canvas_signals[DRAW_BACKGROUND] =
2051
g_signal_new ("draw_background",
2052
G_TYPE_FROM_CLASS (object_class),
2054
G_STRUCT_OFFSET (GnomeCanvasClass, draw_background),
2056
gnome_canvas_marshal_VOID__OBJECT_INT_INT_INT_INT,
2057
G_TYPE_NONE, 5, GDK_TYPE_DRAWABLE,
2058
G_TYPE_INT, G_TYPE_INT, G_TYPE_INT, G_TYPE_INT);
2059
canvas_signals[RENDER_BACKGROUND] =
2060
g_signal_new ("render_background",
2061
G_TYPE_FROM_CLASS (object_class),
2063
G_STRUCT_OFFSET (GnomeCanvasClass, render_background),
2065
g_cclosure_marshal_VOID__POINTER,
2066
G_TYPE_NONE, 1, G_TYPE_POINTER);
2069
/* Callback used when the root item of a canvas is destroyed. The user should
2070
* never ever do this, so we panic if this happens.
2073
panic_root_destroyed (GtkObject *object, gpointer data)
2075
g_error ("Eeeek, root item %p of canvas %p was destroyed!", object, data);
2078
/* Object initialization function for GnomeCanvas */
2080
gnome_canvas_init (GnomeCanvas *canvas)
2082
GTK_WIDGET_SET_FLAGS (canvas, GTK_CAN_FOCUS);
2084
canvas->need_update = FALSE;
2085
canvas->need_redraw = FALSE;
2086
canvas->redraw_area = NULL;
2087
canvas->idle_id = 0;
2089
canvas->scroll_x1 = 0.0;
2090
canvas->scroll_y1 = 0.0;
2091
canvas->scroll_x2 = canvas->layout.width;
2092
canvas->scroll_y2 = canvas->layout.height;
2094
canvas->pixels_per_unit = 1.0;
2096
canvas->pick_event.type = GDK_LEAVE_NOTIFY;
2097
canvas->pick_event.crossing.x = 0;
2098
canvas->pick_event.crossing.y = 0;
2100
canvas->dither = GDK_RGB_DITHER_MAX;
2102
/* This may not be what people want, but it is set to be turned on by
2103
* default to have the same initial behavior as the canvas in GNOME 1.4.
2105
canvas->center_scroll_region = TRUE;
2107
gtk_layout_set_hadjustment (GTK_LAYOUT (canvas), NULL);
2108
gtk_layout_set_vadjustment (GTK_LAYOUT (canvas), NULL);
2110
/* Disable the gtk+ double buffering since the canvas uses it's own. */
2111
gtk_widget_set_double_buffered (GTK_WIDGET (canvas), FALSE);
2113
/* Create the root item as a special case */
2115
canvas->root = GNOME_CANVAS_ITEM (g_object_new (gnome_canvas_group_get_type (), NULL));
2116
canvas->root->canvas = canvas;
2118
g_object_ref (canvas->root);
2119
gtk_object_sink (GTK_OBJECT (canvas->root));
2121
canvas->root_destroy_id = g_signal_connect (canvas->root, "destroy",
2122
G_CALLBACK (panic_root_destroyed),
2125
canvas->need_repick = TRUE;
2128
/* Convenience function to remove the idle handler of a canvas */
2130
remove_idle (GnomeCanvas *canvas)
2132
if (canvas->idle_id == 0)
2135
gtk_idle_remove (canvas->idle_id);
2136
canvas->idle_id = 0;
2139
/* Removes the transient state of the canvas (idle handler, grabs). */
2141
shutdown_transients (GnomeCanvas *canvas)
2143
/* We turn off the need_redraw flag, since if the canvas is mapped again
2144
* it will request a redraw anyways. We do not turn off the need_update
2145
* flag, though, because updates are not queued when the canvas remaps
2148
if (canvas->need_redraw) {
2149
canvas->need_redraw = FALSE;
2150
art_uta_free (canvas->redraw_area);
2151
canvas->redraw_area = NULL;
2152
canvas->redraw_x1 = 0;
2153
canvas->redraw_y1 = 0;
2154
canvas->redraw_x2 = 0;
2155
canvas->redraw_y2 = 0;
2158
if (canvas->grabbed_item) {
2159
canvas->grabbed_item = NULL;
2160
gdk_pointer_ungrab (GDK_CURRENT_TIME);
2163
remove_idle (canvas);
2166
/* Destroy handler for GnomeCanvas */
2168
gnome_canvas_destroy (GtkObject *object)
2170
GnomeCanvas *canvas;
2172
g_return_if_fail (GNOME_IS_CANVAS (object));
2174
/* remember, destroy can be run multiple times! */
2176
canvas = GNOME_CANVAS (object);
2178
if (canvas->root_destroy_id) {
2179
g_signal_handler_disconnect (canvas->root, canvas->root_destroy_id);
2180
canvas->root_destroy_id = 0;
2183
gtk_object_destroy (GTK_OBJECT (canvas->root));
2184
g_object_unref (G_OBJECT (canvas->root));
2185
canvas->root = NULL;
2188
shutdown_transients (canvas);
2190
if (GTK_OBJECT_CLASS (canvas_parent_class)->destroy)
2191
(* GTK_OBJECT_CLASS (canvas_parent_class)->destroy) (object);
2197
* Creates a new empty canvas in non-antialiased mode.
2199
* Return value: A newly-created canvas.
2202
gnome_canvas_new (void)
2204
return GTK_WIDGET (g_object_new (gnome_canvas_get_type (), NULL));
2208
* gnome_canvas_new_aa:
2210
* Creates a new empty canvas in antialiased mode.
2212
* Return value: A newly-created antialiased canvas.
2215
gnome_canvas_new_aa (void)
2217
return GTK_WIDGET (g_object_new (GNOME_TYPE_CANVAS,
2222
/* Map handler for the canvas */
2224
gnome_canvas_map (GtkWidget *widget)
2226
GnomeCanvas *canvas;
2228
g_return_if_fail (GNOME_IS_CANVAS (widget));
2230
/* Normal widget mapping stuff */
2232
if (GTK_WIDGET_CLASS (canvas_parent_class)->map)
2233
(* GTK_WIDGET_CLASS (canvas_parent_class)->map) (widget);
2235
canvas = GNOME_CANVAS (widget);
2237
if (canvas->need_update)
2242
if (GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->map)
2243
(* GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->map) (canvas->root);
2246
/* Unmap handler for the canvas */
2248
gnome_canvas_unmap (GtkWidget *widget)
2250
GnomeCanvas *canvas;
2252
g_return_if_fail (GNOME_IS_CANVAS (widget));
2254
canvas = GNOME_CANVAS (widget);
2256
shutdown_transients (canvas);
2260
if (GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->unmap)
2261
(* GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->unmap) (canvas->root);
2263
/* Normal widget unmapping stuff */
2265
if (GTK_WIDGET_CLASS (canvas_parent_class)->unmap)
2266
(* GTK_WIDGET_CLASS (canvas_parent_class)->unmap) (widget);
2269
/* Realize handler for the canvas */
2271
gnome_canvas_realize (GtkWidget *widget)
2273
GnomeCanvas *canvas;
2275
g_return_if_fail (GNOME_IS_CANVAS (widget));
2277
/* Normal widget realization stuff */
2279
if (GTK_WIDGET_CLASS (canvas_parent_class)->realize)
2280
(* GTK_WIDGET_CLASS (canvas_parent_class)->realize) (widget);
2282
canvas = GNOME_CANVAS (widget);
2284
gdk_window_set_events (canvas->layout.bin_window,
2285
(gdk_window_get_events (canvas->layout.bin_window)
2287
| GDK_BUTTON_PRESS_MASK
2288
| GDK_BUTTON_RELEASE_MASK
2289
| GDK_POINTER_MOTION_MASK
2290
| GDK_KEY_PRESS_MASK
2291
| GDK_KEY_RELEASE_MASK
2292
| GDK_ENTER_NOTIFY_MASK
2293
| GDK_LEAVE_NOTIFY_MASK
2294
| GDK_FOCUS_CHANGE_MASK));
2296
/* Create our own temporary pixmap gc and realize all the items */
2298
canvas->pixmap_gc = gdk_gc_new (canvas->layout.bin_window);
2300
(* GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->realize) (canvas->root);
2303
/* Unrealize handler for the canvas */
2305
gnome_canvas_unrealize (GtkWidget *widget)
2307
GnomeCanvas *canvas;
2309
g_return_if_fail (GNOME_IS_CANVAS (widget));
2311
canvas = GNOME_CANVAS (widget);
2313
shutdown_transients (canvas);
2315
/* Unrealize items and parent widget */
2317
(* GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->unrealize) (canvas->root);
2319
gdk_gc_destroy (canvas->pixmap_gc);
2320
canvas->pixmap_gc = NULL;
2322
if (GTK_WIDGET_CLASS (canvas_parent_class)->unrealize)
2323
(* GTK_WIDGET_CLASS (canvas_parent_class)->unrealize) (widget);
2326
/* Handles scrolling of the canvas. Adjusts the scrolling and zooming offset to
2327
* keep as much as possible of the canvas scrolling region in view.
2330
scroll_to (GnomeCanvas *canvas, int cx, int cy)
2332
int scroll_width, scroll_height;
2333
int right_limit, bottom_limit;
2334
int old_zoom_xofs, old_zoom_yofs;
2335
int changed_x = FALSE, changed_y = FALSE;
2336
int canvas_width, canvas_height;
2338
canvas_width = GTK_WIDGET (canvas)->allocation.width;
2339
canvas_height = GTK_WIDGET (canvas)->allocation.height;
2341
scroll_width = floor ((canvas->scroll_x2 - canvas->scroll_x1) * canvas->pixels_per_unit
2343
scroll_height = floor ((canvas->scroll_y2 - canvas->scroll_y1) * canvas->pixels_per_unit
2346
right_limit = scroll_width - canvas_width;
2347
bottom_limit = scroll_height - canvas_height;
2349
old_zoom_xofs = canvas->zoom_xofs;
2350
old_zoom_yofs = canvas->zoom_yofs;
2352
if (right_limit < 0) {
2355
if (canvas->center_scroll_region) {
2356
canvas->zoom_xofs = (canvas_width - scroll_width) / 2;
2357
scroll_width = canvas_width;
2359
canvas->zoom_xofs = 0;
2360
} else if (cx < 0) {
2362
canvas->zoom_xofs = 0;
2363
} else if (cx > right_limit) {
2365
canvas->zoom_xofs = 0;
2367
canvas->zoom_xofs = 0;
2369
if (bottom_limit < 0) {
2372
if (canvas->center_scroll_region) {
2373
canvas->zoom_yofs = (canvas_height - scroll_height) / 2;
2374
scroll_height = canvas_height;
2376
canvas->zoom_yofs = 0;
2377
} else if (cy < 0) {
2379
canvas->zoom_yofs = 0;
2380
} else if (cy > bottom_limit) {
2382
canvas->zoom_yofs = 0;
2384
canvas->zoom_yofs = 0;
2386
if ((canvas->zoom_xofs != old_zoom_xofs) || (canvas->zoom_yofs != old_zoom_yofs)) {
2387
/* This can only occur, if either canvas size or widget size changes */
2388
/* So I think we can request full redraw here */
2389
/* The reason is, that coverage UTA will be invalidated by offset change */
2390
/* fixme: Strictly this is not correct - we have to remove our own idle (Lauris) */
2391
/* More stuff - we have to mark root as needing fresh affine (Lauris) */
2392
if (!(canvas->root->object.flags & GNOME_CANVAS_ITEM_NEED_AFFINE)) {
2393
canvas->root->object.flags |= GNOME_CANVAS_ITEM_NEED_AFFINE;
2394
gnome_canvas_request_update (canvas);
2396
gtk_widget_queue_draw (GTK_WIDGET (canvas));
2399
if (canvas->layout.hadjustment && ((int) canvas->layout.hadjustment->value) != cx) {
2400
canvas->layout.hadjustment->value = cx;
2404
if (canvas->layout.vadjustment && ((int) canvas->layout.vadjustment->value) != cy) {
2405
canvas->layout.vadjustment->value = cy;
2409
if ((scroll_width != (int) canvas->layout.width)
2410
|| (scroll_height != (int) canvas->layout.height))
2411
gtk_layout_set_size (GTK_LAYOUT (canvas), scroll_width, scroll_height);
2413
/* Signal GtkLayout that it should do a redraw. */
2416
g_signal_emit_by_name (canvas->layout.hadjustment, "value_changed");
2419
g_signal_emit_by_name (canvas->layout.vadjustment, "value_changed");
2422
/* Size allocation handler for the canvas */
2424
gnome_canvas_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
2426
GnomeCanvas *canvas;
2428
g_return_if_fail (GNOME_IS_CANVAS (widget));
2429
g_return_if_fail (allocation != NULL);
2431
if (GTK_WIDGET_CLASS (canvas_parent_class)->size_allocate)
2432
(* GTK_WIDGET_CLASS (canvas_parent_class)->size_allocate) (widget, allocation);
2434
canvas = GNOME_CANVAS (widget);
2436
/* Recenter the view, if appropriate */
2438
canvas->layout.hadjustment->page_size = allocation->width;
2439
canvas->layout.hadjustment->page_increment = allocation->width / 2;
2441
canvas->layout.vadjustment->page_size = allocation->height;
2442
canvas->layout.vadjustment->page_increment = allocation->height / 2;
2445
canvas->layout.hadjustment->value,
2446
canvas->layout.vadjustment->value);
2448
g_signal_emit_by_name (canvas->layout.hadjustment, "changed");
2449
g_signal_emit_by_name (canvas->layout.vadjustment, "changed");
2452
/* Emits an event for an item in the canvas, be it the current item, grabbed
2453
* item, or focused item, as appropriate.
2457
emit_event (GnomeCanvas *canvas, GdkEvent *event)
2461
GnomeCanvasItem *item;
2462
GnomeCanvasItem *parent;
2465
/* Perform checks for grabbed items */
2467
if (canvas->grabbed_item &&
2468
!is_descendant (canvas->current_item, canvas->grabbed_item)) {
2469
/* I think this warning is annoying and I don't know what it's for
2470
* so I'll disable it for now.
2472
/* g_warning ("emit_event() returning FALSE!\n");*/
2476
if (canvas->grabbed_item) {
2477
switch (event->type) {
2478
case GDK_ENTER_NOTIFY:
2479
mask = GDK_ENTER_NOTIFY_MASK;
2482
case GDK_LEAVE_NOTIFY:
2483
mask = GDK_LEAVE_NOTIFY_MASK;
2486
case GDK_MOTION_NOTIFY:
2487
mask = GDK_POINTER_MOTION_MASK;
2490
case GDK_BUTTON_PRESS:
2491
case GDK_2BUTTON_PRESS:
2492
case GDK_3BUTTON_PRESS:
2493
mask = GDK_BUTTON_PRESS_MASK;
2496
case GDK_BUTTON_RELEASE:
2497
mask = GDK_BUTTON_RELEASE_MASK;
2501
mask = GDK_KEY_PRESS_MASK;
2504
case GDK_KEY_RELEASE:
2505
mask = GDK_KEY_RELEASE_MASK;
2513
if (!(mask & canvas->grabbed_event_mask))
2517
/* Convert to world coordinates -- we have two cases because of diferent
2518
* offsets of the fields in the event structures.
2521
ev = gdk_event_copy (event);
2525
case GDK_ENTER_NOTIFY:
2526
case GDK_LEAVE_NOTIFY:
2527
gnome_canvas_window_to_world (canvas,
2528
ev->crossing.x, ev->crossing.y,
2529
&ev->crossing.x, &ev->crossing.y);
2532
case GDK_MOTION_NOTIFY:
2533
case GDK_BUTTON_PRESS:
2534
case GDK_2BUTTON_PRESS:
2535
case GDK_3BUTTON_PRESS:
2536
case GDK_BUTTON_RELEASE:
2537
gnome_canvas_window_to_world (canvas,
2538
ev->motion.x, ev->motion.y,
2539
&ev->motion.x, &ev->motion.y);
2546
/* Choose where we send the event */
2548
item = canvas->current_item;
2550
if (canvas->focused_item
2551
&& ((event->type == GDK_KEY_PRESS) ||
2552
(event->type == GDK_KEY_RELEASE) ||
2553
(event->type == GDK_FOCUS_CHANGE)))
2554
item = canvas->focused_item;
2556
/* The event is propagated up the hierarchy (for if someone connected to
2557
* a group instead of a leaf event), and emission is stopped if a
2558
* handler returns TRUE, just like for GtkWidget events.
2563
while (item && !finished) {
2564
g_object_ref (G_OBJECT (item));
2566
g_signal_emit (item, item_signals[ITEM_EVENT], 0,
2569
parent = item->parent;
2570
g_object_unref (G_OBJECT (item));
2575
gdk_event_free (ev);
2580
/* Re-picks the current item in the canvas, based on the event's coordinates.
2581
* Also emits enter/leave events for items as appropriate.
2584
pick_current_item (GnomeCanvas *canvas, GdkEvent *event)
2593
/* If a button is down, we'll perform enter and leave events on the
2594
* current item, but not enter on any other item. This is more or less
2595
* like X pointer grabbing for canvas items.
2597
button_down = canvas->state & (GDK_BUTTON1_MASK
2601
| GDK_BUTTON5_MASK);
2603
canvas->left_grabbed_item = FALSE;
2605
/* Save the event in the canvas. This is used to synthesize enter and
2606
* leave events in case the current item changes. It is also used to
2607
* re-pick the current item if the current one gets deleted. Also,
2608
* synthesize an enter event.
2610
if (event != &canvas->pick_event) {
2611
if ((event->type == GDK_MOTION_NOTIFY) || (event->type == GDK_BUTTON_RELEASE)) {
2612
/* these fields have the same offsets in both types of events */
2614
canvas->pick_event.crossing.type = GDK_ENTER_NOTIFY;
2615
canvas->pick_event.crossing.window = event->motion.window;
2616
canvas->pick_event.crossing.send_event = event->motion.send_event;
2617
canvas->pick_event.crossing.subwindow = NULL;
2618
canvas->pick_event.crossing.x = event->motion.x;
2619
canvas->pick_event.crossing.y = event->motion.y;
2620
canvas->pick_event.crossing.mode = GDK_CROSSING_NORMAL;
2621
canvas->pick_event.crossing.detail = GDK_NOTIFY_NONLINEAR;
2622
canvas->pick_event.crossing.focus = FALSE;
2623
canvas->pick_event.crossing.state = event->motion.state;
2625
/* these fields don't have the same offsets in both types of events */
2627
if (event->type == GDK_MOTION_NOTIFY) {
2628
canvas->pick_event.crossing.x_root = event->motion.x_root;
2629
canvas->pick_event.crossing.y_root = event->motion.y_root;
2631
canvas->pick_event.crossing.x_root = event->button.x_root;
2632
canvas->pick_event.crossing.y_root = event->button.y_root;
2635
canvas->pick_event = *event;
2638
/* Don't do anything else if this is a recursive call */
2640
if (canvas->in_repick)
2643
/* LeaveNotify means that there is no current item, so we don't look for one */
2645
if (canvas->pick_event.type != GDK_LEAVE_NOTIFY) {
2646
/* these fields don't have the same offsets in both types of events */
2648
if (canvas->pick_event.type == GDK_ENTER_NOTIFY) {
2649
x = canvas->pick_event.crossing.x - canvas->zoom_xofs;
2650
y = canvas->pick_event.crossing.y - canvas->zoom_yofs;
2652
x = canvas->pick_event.motion.x - canvas->zoom_xofs;
2653
y = canvas->pick_event.motion.y - canvas->zoom_yofs;
2656
/* canvas pixel coords */
2658
cx = (int) (x + 0.5);
2659
cy = (int) (y + 0.5);
2663
x = canvas->scroll_x1 + x / canvas->pixels_per_unit;
2664
y = canvas->scroll_y1 + y / canvas->pixels_per_unit;
2666
/* find the closest item */
2668
if (canvas->root->object.flags & GNOME_CANVAS_ITEM_VISIBLE)
2669
gnome_canvas_item_invoke_point (canvas->root, x, y, cx, cy,
2670
&canvas->new_current_item);
2672
canvas->new_current_item = NULL;
2674
canvas->new_current_item = NULL;
2676
if ((canvas->new_current_item == canvas->current_item) && !canvas->left_grabbed_item)
2677
return retval; /* current item did not change */
2679
/* Synthesize events for old and new current items */
2681
if ((canvas->new_current_item != canvas->current_item)
2682
&& (canvas->current_item != NULL)
2683
&& !canvas->left_grabbed_item) {
2686
new_event = canvas->pick_event;
2687
new_event.type = GDK_LEAVE_NOTIFY;
2689
new_event.crossing.detail = GDK_NOTIFY_ANCESTOR;
2690
new_event.crossing.subwindow = NULL;
2691
canvas->in_repick = TRUE;
2692
retval = emit_event (canvas, &new_event);
2693
canvas->in_repick = FALSE;
2696
/* new_current_item may have been set to NULL during the call to emit_event() above */
2698
if ((canvas->new_current_item != canvas->current_item) && button_down) {
2699
canvas->left_grabbed_item = TRUE;
2703
/* Handle the rest of cases */
2705
canvas->left_grabbed_item = FALSE;
2706
canvas->current_item = canvas->new_current_item;
2708
if (canvas->current_item != NULL) {
2711
new_event = canvas->pick_event;
2712
new_event.type = GDK_ENTER_NOTIFY;
2713
new_event.crossing.detail = GDK_NOTIFY_ANCESTOR;
2714
new_event.crossing.subwindow = NULL;
2715
retval = emit_event (canvas, &new_event);
2721
/* Button event handler for the canvas */
2723
gnome_canvas_button (GtkWidget *widget, GdkEventButton *event)
2725
GnomeCanvas *canvas;
2729
g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE);
2730
g_return_val_if_fail (event != NULL, FALSE);
2734
canvas = GNOME_CANVAS (widget);
2737
* dispatch normally regardless of the event's window if an item has
2738
* has a pointer grab in effect
2740
if (!canvas->grabbed_item && event->window != canvas->layout.bin_window)
2743
switch (event->button) {
2745
mask = GDK_BUTTON1_MASK;
2748
mask = GDK_BUTTON2_MASK;
2751
mask = GDK_BUTTON3_MASK;
2754
mask = GDK_BUTTON4_MASK;
2757
mask = GDK_BUTTON5_MASK;
2763
switch (event->type) {
2764
case GDK_BUTTON_PRESS:
2765
case GDK_2BUTTON_PRESS:
2766
case GDK_3BUTTON_PRESS:
2767
/* Pick the current item as if the button were not pressed, and
2768
* then process the event.
2770
canvas->state = event->state;
2771
pick_current_item (canvas, (GdkEvent *) event);
2772
canvas->state ^= mask;
2773
retval = emit_event (canvas, (GdkEvent *) event);
2776
case GDK_BUTTON_RELEASE:
2777
/* Process the event as if the button were pressed, then repick
2778
* after the button has been released
2780
canvas->state = event->state;
2781
retval = emit_event (canvas, (GdkEvent *) event);
2782
event->state ^= mask;
2783
canvas->state = event->state;
2784
pick_current_item (canvas, (GdkEvent *) event);
2785
event->state ^= mask;
2789
g_assert_not_reached ();
2795
/* Motion event handler for the canvas */
2797
gnome_canvas_motion (GtkWidget *widget, GdkEventMotion *event)
2799
GnomeCanvas *canvas;
2801
g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE);
2802
g_return_val_if_fail (event != NULL, FALSE);
2804
canvas = GNOME_CANVAS (widget);
2806
if (event->window != canvas->layout.bin_window)
2809
canvas->state = event->state;
2810
pick_current_item (canvas, (GdkEvent *) event);
2811
return emit_event (canvas, (GdkEvent *) event);
2814
/* Key event handler for the canvas */
2816
gnome_canvas_key (GtkWidget *widget, GdkEventKey *event)
2818
GnomeCanvas *canvas;
2820
g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE);
2821
g_return_val_if_fail (event != NULL, FALSE);
2823
canvas = GNOME_CANVAS (widget);
2825
if (!emit_event (canvas, (GdkEvent *) event)) {
2826
GtkWidgetClass *widget_class;
2828
widget_class = GTK_WIDGET_CLASS (canvas_parent_class);
2830
if (event->type == GDK_KEY_PRESS) {
2831
if (widget_class->key_press_event)
2832
return (* widget_class->key_press_event) (widget, event);
2833
} else if (event->type == GDK_KEY_RELEASE) {
2834
if (widget_class->key_release_event)
2835
return (* widget_class->key_release_event) (widget, event);
2837
g_assert_not_reached ();
2845
/* Crossing event handler for the canvas */
2847
gnome_canvas_crossing (GtkWidget *widget, GdkEventCrossing *event)
2849
GnomeCanvas *canvas;
2851
g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE);
2852
g_return_val_if_fail (event != NULL, FALSE);
2854
canvas = GNOME_CANVAS (widget);
2856
if (event->window != canvas->layout.bin_window)
2859
canvas->state = event->state;
2860
return pick_current_item (canvas, (GdkEvent *) event);
2863
/* Focus in handler for the canvas */
2865
gnome_canvas_focus_in (GtkWidget *widget, GdkEventFocus *event)
2867
GnomeCanvas *canvas;
2869
GTK_WIDGET_SET_FLAGS (widget, GTK_HAS_FOCUS);
2871
canvas = GNOME_CANVAS (widget);
2873
if (canvas->focused_item)
2874
return emit_event (canvas, (GdkEvent *) event);
2879
/* Focus out handler for the canvas */
2881
gnome_canvas_focus_out (GtkWidget *widget, GdkEventFocus *event)
2883
GnomeCanvas *canvas;
2885
GTK_WIDGET_UNSET_FLAGS (widget, GTK_HAS_FOCUS);
2887
canvas = GNOME_CANVAS (widget);
2889
if (canvas->focused_item)
2890
return emit_event (canvas, (GdkEvent *) event);
2895
#define IMAGE_WIDTH 512
2896
#define IMAGE_HEIGHT 512
2898
#define IMAGE_WIDTH_AA 256
2899
#define IMAGE_HEIGHT_AA 64
2902
gnome_canvas_paint_rect (GnomeCanvas *canvas, gint x0, gint y0, gint x1, gint y1)
2905
gint draw_x1, draw_y1;
2906
gint draw_x2, draw_y2;
2907
gint xblock, yblock;
2911
g_return_if_fail (!canvas->need_update);
2913
widget = GTK_WIDGET (canvas);
2915
draw_x1 = MAX (x0, canvas->layout.hadjustment->value - canvas->zoom_xofs);
2916
draw_y1 = MAX (y0, canvas->layout.vadjustment->value - canvas->zoom_yofs);
2917
draw_x2 = MIN (draw_x1 + GTK_WIDGET (canvas)->allocation.width, x1);
2918
draw_y2 = MIN (draw_y1 + GTK_WIDGET (canvas)->allocation.height, y1);
2920
/* As we can come from expose, we have to tile here */
2921
xblock = (canvas->aa) ? IMAGE_WIDTH_AA : IMAGE_WIDTH;
2922
yblock = (canvas->aa) ? IMAGE_HEIGHT_AA : IMAGE_HEIGHT;
2927
for (y0 = draw_y1; y0 < draw_y2; y0 += yblock) {
2928
y1 = MIN (y0 + yblock, draw_y2);
2929
for (x0 = draw_x1; x0 < draw_x2; x0 += xblock) {
2930
x1 = MIN (x0 + xblock, draw_x2);
2932
canvas->redraw_x1 = x0;
2933
canvas->redraw_y1 = y0;
2934
canvas->redraw_x2 = x1;
2935
canvas->redraw_y2 = y1;
2936
canvas->draw_xofs = x0;
2937
canvas->draw_yofs = y0;
2943
if (!px) px = g_new (guchar, IMAGE_WIDTH_AA * IMAGE_HEIGHT_AA * 3);
2946
buf.buf_rowstride = IMAGE_WIDTH_AA * 3;
2951
color = &widget->style->bg[GTK_STATE_NORMAL];
2952
buf.bg_color = (((color->red & 0xff00) << 8) | (color->green & 0xff00) | (color->blue >> 8));
2956
g_signal_emit (G_OBJECT (canvas), canvas_signals[RENDER_BACKGROUND], 0, &buf);
2958
if (canvas->root->object.flags & GNOME_CANVAS_ITEM_VISIBLE)
2959
(* GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->render) (canvas->root, &buf);
2962
gdk_rgb_gc_set_foreground (canvas->pixmap_gc, buf.bg_color);
2963
gdk_draw_rectangle (canvas->layout.bin_window,
2966
(x0 + canvas->zoom_xofs),
2967
(y0 + canvas->zoom_yofs),
2970
gdk_draw_rgb_image_dithalign (canvas->layout.bin_window,
2972
(x0 + canvas->zoom_xofs),
2973
(y0 + canvas->zoom_yofs),
2981
if (!pixmap) pixmap = gdk_pixmap_new (canvas->layout.bin_window, IMAGE_WIDTH, IMAGE_HEIGHT,
2982
gtk_widget_get_visual (widget)->depth);
2984
g_signal_emit (G_OBJECT (canvas), canvas_signals[DRAW_BACKGROUND], 0, pixmap,
2985
x0, y0, x1 - x0, y1 - y0);
2987
if (canvas->root->object.flags & GNOME_CANVAS_ITEM_VISIBLE)
2988
(* GNOME_CANVAS_ITEM_GET_CLASS (
2989
canvas->root)->draw) (
2990
canvas->root, pixmap,
2993
/* Copy the pixmap to the window and clean up */
2995
gdk_draw_pixmap (canvas->layout.bin_window,
2999
x0 + canvas->zoom_xofs,
3000
y0 + canvas->zoom_yofs,
3006
if (px) g_free (px);
3007
if (pixmap) gdk_pixmap_unref (pixmap);
3010
/* Expose handler for the canvas */
3012
gnome_canvas_expose (GtkWidget *widget, GdkEventExpose *event)
3014
GnomeCanvas *canvas;
3015
GdkRectangle *rects;
3019
canvas = GNOME_CANVAS (widget);
3021
if (!GTK_WIDGET_DRAWABLE (widget) || (event->window != canvas->layout.bin_window))
3025
g_print ("Expose\n");
3028
gdk_region_get_rectangles (event->region, &rects, &n_rects);
3030
for (i = 0; i < n_rects; i++) {
3033
rect.x0 = rects[i].x - canvas->zoom_xofs;
3034
rect.y0 = rects[i].y - canvas->zoom_yofs;
3035
rect.x1 = rects[i].x + rects[i].width - canvas->zoom_xofs;
3036
rect.y1 = rects[i].y + rects[i].height - canvas->zoom_yofs;
3038
if (canvas->need_update || canvas->need_redraw) {
3040
/* Update or drawing is scheduled, so just mark exposed area as dirty */
3041
uta = art_uta_from_irect (&rect);
3042
gnome_canvas_request_redraw_uta (canvas, uta);
3044
/* No pending updates, draw exposed area immediately */
3045
gnome_canvas_paint_rect (canvas, rect.x0, rect.y0, rect.x1, rect.y1);
3047
/* And call expose on parent container class */
3048
if (GTK_WIDGET_CLASS (canvas_parent_class)->expose_event)
3049
(* GTK_WIDGET_CLASS (canvas_parent_class)->expose_event) (
3059
/* Repaints the areas in the canvas that need it */
3061
paint (GnomeCanvas *canvas)
3067
rects = art_rect_list_from_uta (canvas->redraw_area,
3068
IMAGE_WIDTH_AA, IMAGE_HEIGHT_AA,
3071
rects = art_rect_list_from_uta (canvas->redraw_area,
3072
IMAGE_WIDTH, IMAGE_HEIGHT,
3075
art_uta_free (canvas->redraw_area);
3076
canvas->redraw_area = NULL;
3077
canvas->need_redraw = FALSE;
3079
/* Send synthetic expose events */
3080
for (i = 0; i < n_rects; i++) {
3082
gint x0, y0, x1, y1;
3084
x0 = MAX (canvas->layout.hadjustment->value - canvas->zoom_xofs, rects[i].x0);
3085
y0 = MAX (canvas->layout.vadjustment->value - canvas->zoom_yofs, rects[i].y0);
3086
x1 = MIN (x0 + GTK_WIDGET (canvas)->allocation.width, rects[i].x1);
3087
y1 = MIN (y0 + GTK_WIDGET (canvas)->allocation.height, rects[i].y1);
3089
if ((x0 < x1) && (y0 < y1)) {
3090
/* Here we are - whatever type is canvas, we have to send synthetic expose to layout (Lauris) */
3091
ex.type = GDK_EXPOSE;
3092
ex.window = canvas->layout.bin_window;
3093
ex.send_event = TRUE;
3094
ex.area.x = x0 + canvas->zoom_xofs;
3095
ex.area.y = y0 + canvas->zoom_yofs;
3096
ex.area.width = x1 - x0;
3097
ex.area.height = y1 - y0;
3098
ex.region = gdk_region_rectangle (&ex.area);
3100
gtk_widget_send_expose (GTK_WIDGET (canvas), (GdkEvent *) &ex);
3101
gdk_region_destroy (ex.region);
3107
canvas->redraw_x1 = 0;
3108
canvas->redraw_y1 = 0;
3109
canvas->redraw_x2 = 0;
3110
canvas->redraw_y2 = 0;
3114
gnome_canvas_draw_background (GnomeCanvas *canvas, GdkDrawable *drawable,
3115
int x, int y, int width, int height)
3117
/* By default, we use the style background. */
3118
gdk_gc_set_foreground (canvas->pixmap_gc,
3119
>K_WIDGET (canvas)->style->bg[GTK_STATE_NORMAL]);
3120
gdk_draw_rectangle (drawable,
3128
do_update (GnomeCanvas *canvas)
3130
/* Cause the update if necessary */
3133
if (canvas->need_update) {
3136
/* We start updating root with w2cpx affine */
3137
w2cpx[0] = canvas->pixels_per_unit;
3140
w2cpx[3] = canvas->pixels_per_unit;
3141
w2cpx[4] = -canvas->scroll_x1 * canvas->pixels_per_unit;
3142
w2cpx[5] = -canvas->scroll_y1 * canvas->pixels_per_unit;
3144
gnome_canvas_item_invoke_update (canvas->root, w2cpx, NULL, 0);
3146
canvas->need_update = FALSE;
3149
/* Pick new current item */
3151
while (canvas->need_repick) {
3152
canvas->need_repick = FALSE;
3153
pick_current_item (canvas, &canvas->pick_event);
3156
/* it is possible that during picking we emitted an event in which
3157
the user then called some function which then requested update
3158
of something. Without this we'd be left in a state where
3159
need_update would have been left TRUE and the canvas would have
3160
been left unpainted. */
3161
if (canvas->need_update) {
3165
/* Paint if able to */
3167
if (GTK_WIDGET_DRAWABLE (canvas) && canvas->need_redraw)
3171
/* Idle handler for the canvas. It deals with pending updates and redraws. */
3173
idle_handler (gpointer data)
3175
GnomeCanvas *canvas;
3177
GDK_THREADS_ENTER ();
3179
canvas = GNOME_CANVAS (data);
3183
canvas->idle_id = 0;
3185
GDK_THREADS_LEAVE ();
3190
/* Convenience function to add an idle handler to a canvas */
3192
add_idle (GnomeCanvas *canvas)
3194
g_assert (canvas->need_update || canvas->need_redraw);
3196
if (!canvas->idle_id)
3197
canvas->idle_id = g_idle_add_full (CANVAS_IDLE_PRIORITY,
3202
/* canvas->idle_id = gtk_idle_add (idle_handler, canvas); */
3206
* gnome_canvas_root:
3207
* @canvas: A canvas.
3209
* Queries the root group of a canvas.
3211
* Return value: The root group of the specified canvas.
3214
gnome_canvas_root (GnomeCanvas *canvas)
3216
g_return_val_if_fail (GNOME_IS_CANVAS (canvas), NULL);
3218
return GNOME_CANVAS_GROUP (canvas->root);
3223
* gnome_canvas_set_scroll_region:
3224
* @canvas: A canvas.
3225
* @x1: Leftmost limit of the scrolling region.
3226
* @y1: Upper limit of the scrolling region.
3227
* @x2: Rightmost limit of the scrolling region.
3228
* @y2: Lower limit of the scrolling region.
3230
* Sets the scrolling region of a canvas to the specified rectangle. The canvas
3231
* will then be able to scroll only within this region. The view of the canvas
3232
* is adjusted as appropriate to display as much of the new region as possible.
3235
gnome_canvas_set_scroll_region (GnomeCanvas *canvas, double x1, double y1, double x2, double y2)
3237
double wxofs, wyofs;
3240
g_return_if_fail (GNOME_IS_CANVAS (canvas));
3243
* Set the new scrolling region. If possible, do not move the visible contents of the
3247
gnome_canvas_c2w (canvas,
3248
GTK_LAYOUT (canvas)->hadjustment->value + canvas->zoom_xofs,
3249
GTK_LAYOUT (canvas)->vadjustment->value + canvas->zoom_yofs,
3250
/*canvas->zoom_xofs,
3251
canvas->zoom_yofs,*/
3254
canvas->scroll_x1 = x1;
3255
canvas->scroll_y1 = y1;
3256
canvas->scroll_x2 = x2;
3257
canvas->scroll_y2 = y2;
3259
gnome_canvas_w2c (canvas, wxofs, wyofs, &xofs, &yofs);
3261
scroll_to (canvas, xofs, yofs);
3263
canvas->need_repick = TRUE;
3265
/* todo: should be requesting update */
3266
(* GNOME_CANVAS_ITEM_CLASS (canvas->root->object.klass)->update) (
3267
canvas->root, NULL, NULL, 0);
3273
* gnome_canvas_get_scroll_region:
3274
* @canvas: A canvas.
3275
* @x1: Leftmost limit of the scrolling region (return value).
3276
* @y1: Upper limit of the scrolling region (return value).
3277
* @x2: Rightmost limit of the scrolling region (return value).
3278
* @y2: Lower limit of the scrolling region (return value).
3280
* Queries the scrolling region of a canvas.
3283
gnome_canvas_get_scroll_region (GnomeCanvas *canvas, double *x1, double *y1, double *x2, double *y2)
3285
g_return_if_fail (GNOME_IS_CANVAS (canvas));
3288
*x1 = canvas->scroll_x1;
3291
*y1 = canvas->scroll_y1;
3294
*x2 = canvas->scroll_x2;
3297
*y2 = canvas->scroll_y2;
3301
* gnome_canvas_set_center_scroll_region:
3302
* @canvas: A canvas.
3303
* @center_scroll_region: Whether to center the scrolling region in the canvas
3304
* window when it is smaller than the canvas' allocation.
3306
* When the scrolling region of the canvas is smaller than the canvas window,
3307
* e.g. the allocation of the canvas, it can be either centered on the window
3308
* or simply made to be on the upper-left corner on the window. This function
3309
* lets you configure this property.
3312
gnome_canvas_set_center_scroll_region (GnomeCanvas *canvas, gboolean center_scroll_region)
3314
g_return_if_fail (GNOME_IS_CANVAS (canvas));
3316
canvas->center_scroll_region = center_scroll_region != 0;
3319
canvas->layout.hadjustment->value,
3320
canvas->layout.vadjustment->value);
3324
* gnome_canvas_get_center_scroll_region:
3325
* @canvas: A canvas.
3327
* Returns whether the canvas is set to center the scrolling region in the window
3328
* if the former is smaller than the canvas' allocation.
3330
* Return value: Whether the scroll region is being centered in the canvas window.
3333
gnome_canvas_get_center_scroll_region (GnomeCanvas *canvas)
3335
g_return_val_if_fail (GNOME_IS_CANVAS (canvas), FALSE);
3337
return canvas->center_scroll_region ? TRUE : FALSE;
3341
* gnome_canvas_set_pixels_per_unit:
3342
* @canvas: A canvas.
3343
* @n: The number of pixels that correspond to one canvas unit.
3345
* Sets the zooming factor of a canvas by specifying the number of pixels that
3346
* correspond to one canvas unit.
3348
* The anchor point for zooming, i.e. the point that stays fixed and all others
3349
* zoom inwards or outwards from it, depends on whether the canvas is set to
3350
* center the scrolling region or not. You can control this using the
3351
* gnome_canvas_set_center_scroll_region() function. If the canvas is set to
3352
* center the scroll region, then the center of the canvas window is used as the
3353
* anchor point for zooming. Otherwise, the upper-left corner of the canvas
3354
* window is used as the anchor point.
3357
gnome_canvas_set_pixels_per_unit (GnomeCanvas *canvas, double n)
3361
int anchor_x, anchor_y;
3363
g_return_if_fail (GNOME_IS_CANVAS (canvas));
3364
g_return_if_fail (n > GNOME_CANVAS_EPSILON);
3366
if (canvas->center_scroll_region) {
3367
anchor_x = GTK_WIDGET (canvas)->allocation.width / 2;
3368
anchor_y = GTK_WIDGET (canvas)->allocation.height / 2;
3370
anchor_x = anchor_y = 0;
3372
/* Find the coordinates of the anchor point in units. */
3373
if(canvas->layout.hadjustment) {
3374
ax = (canvas->layout.hadjustment->value + anchor_x) / canvas->pixels_per_unit + canvas->scroll_x1 + canvas->zoom_xofs;
3376
ax = (0.0 + anchor_x) / canvas->pixels_per_unit + canvas->scroll_x1 + canvas->zoom_xofs;
3378
if(canvas->layout.hadjustment) {
3379
ay = (canvas->layout.vadjustment->value + anchor_y) / canvas->pixels_per_unit + canvas->scroll_y1 + canvas->zoom_yofs;
3381
ay = (0.0 + anchor_y) / canvas->pixels_per_unit + canvas->scroll_y1 + canvas->zoom_yofs;
3384
/* Now calculate the new offset of the upper left corner. */
3385
x1 = ((ax - canvas->scroll_x1) * n) - anchor_x;
3386
y1 = ((ay - canvas->scroll_y1) * n) - anchor_y;
3388
canvas->pixels_per_unit = n;
3390
scroll_to (canvas, x1, y1);
3392
if (!(canvas->root->object.flags & GNOME_CANVAS_ITEM_NEED_AFFINE)) {
3393
canvas->root->object.flags |= GNOME_CANVAS_ITEM_NEED_AFFINE;
3394
gnome_canvas_request_update (canvas);
3397
canvas->need_repick = TRUE;
3401
* gnome_canvas_scroll_to:
3402
* @canvas: A canvas.
3403
* @cx: Horizontal scrolling offset in canvas pixel units.
3404
* @cy: Vertical scrolling offset in canvas pixel units.
3406
* Makes a canvas scroll to the specified offsets, given in canvas pixel units.
3407
* The canvas will adjust the view so that it is not outside the scrolling
3408
* region. This function is typically not used, as it is better to hook
3409
* scrollbars to the canvas layout's scrolling adjusments.
3412
gnome_canvas_scroll_to (GnomeCanvas *canvas, int cx, int cy)
3414
g_return_if_fail (GNOME_IS_CANVAS (canvas));
3416
scroll_to (canvas, cx, cy);
3420
* gnome_canvas_get_scroll_offsets:
3421
* @canvas: A canvas.
3422
* @cx: Horizontal scrolling offset (return value).
3423
* @cy: Vertical scrolling offset (return value).
3425
* Queries the scrolling offsets of a canvas. The values are returned in canvas
3429
gnome_canvas_get_scroll_offsets (GnomeCanvas *canvas, int *cx, int *cy)
3431
g_return_if_fail (GNOME_IS_CANVAS (canvas));
3434
*cx = canvas->layout.hadjustment->value;
3437
*cy = canvas->layout.vadjustment->value;
3441
* gnome_canvas_update_now:
3442
* @canvas: A canvas.
3444
* Forces an immediate update and redraw of a canvas. If the canvas does not
3445
* have any pending update or redraw requests, then no action is taken. This is
3446
* typically only used by applications that need explicit control of when the
3447
* display is updated, like games. It is not needed by normal applications.
3450
gnome_canvas_update_now (GnomeCanvas *canvas)
3452
g_return_if_fail (GNOME_IS_CANVAS (canvas));
3454
if (!(canvas->need_update || canvas->need_redraw)) {
3455
g_assert (canvas->idle_id == 0);
3456
g_assert (canvas->redraw_area == NULL);
3460
remove_idle (canvas);
3465
* gnome_canvas_get_item_at:
3466
* @canvas: A canvas.
3467
* @x: X position in world coordinates.
3468
* @y: Y position in world coordinates.
3470
* Looks for the item that is under the specified position, which must be
3471
* specified in world coordinates.
3473
* Return value: The sought item, or NULL if no item is at the specified
3477
gnome_canvas_get_item_at (GnomeCanvas *canvas, double x, double y)
3479
GnomeCanvasItem *item;
3483
g_return_val_if_fail (GNOME_IS_CANVAS (canvas), NULL);
3485
gnome_canvas_w2c (canvas, x, y, &cx, &cy);
3487
dist = gnome_canvas_item_invoke_point (canvas->root, x, y, cx, cy, &item);
3488
if ((int) (dist * canvas->pixels_per_unit + 0.5) <= canvas->close_enough)
3494
/* Queues an update of the canvas */
3496
gnome_canvas_request_update (GnomeCanvas *canvas)
3498
GNOME_CANVAS_GET_CLASS (canvas)->request_update (canvas);
3502
gnome_canvas_request_update_real (GnomeCanvas *canvas)
3504
if (canvas->need_update)
3507
canvas->need_update = TRUE;
3508
if (GTK_WIDGET_MAPPED ((GtkWidget *) canvas))
3512
/* Computes the union of two microtile arrays while clipping the result to the
3513
* specified rectangle. Any of the specified utas can be NULL, in which case it
3514
* is taken to be an empty region.
3517
uta_union_clip (ArtUta *uta1, ArtUta *uta2, ArtIRect *clip)
3521
int clip_x1, clip_y1, clip_x2, clip_y2;
3522
int union_x1, union_y1, union_x2, union_y2;
3523
int new_x1, new_y1, new_x2, new_y2;
3525
int ofs, ofs1, ofs2;
3527
g_assert (clip != NULL);
3529
/* Compute the tile indices for the clipping rectangle */
3531
clip_x1 = clip->x0 >> ART_UTILE_SHIFT;
3532
clip_y1 = clip->y0 >> ART_UTILE_SHIFT;
3533
clip_x2 = (clip->x1 >> ART_UTILE_SHIFT) + 1;
3534
clip_y2 = (clip->y1 >> ART_UTILE_SHIFT) + 1;
3536
/* Get the union of the bounds of both utas */
3540
return art_uta_new (clip_x1, clip_y1, clip_x1 + 1, clip_y1 + 1);
3542
union_x1 = uta2->x0;
3543
union_y1 = uta2->y0;
3544
union_x2 = uta2->x0 + uta2->width;
3545
union_y2 = uta2->y0 + uta2->height;
3548
union_x1 = uta1->x0;
3549
union_y1 = uta1->y0;
3550
union_x2 = uta1->x0 + uta1->width;
3551
union_y2 = uta1->y0 + uta1->height;
3553
union_x1 = MIN (uta1->x0, uta2->x0);
3554
union_y1 = MIN (uta1->y0, uta2->y0);
3555
union_x2 = MAX (uta1->x0 + uta1->width, uta2->x0 + uta2->width);
3556
union_y2 = MAX (uta1->y0 + uta1->height, uta2->y0 + uta2->height);
3560
/* Clip the union of the bounds */
3562
new_x1 = MAX (clip_x1, union_x1);
3563
new_y1 = MAX (clip_y1, union_y1);
3564
new_x2 = MIN (clip_x2, union_x2);
3565
new_y2 = MIN (clip_y2, union_y2);
3567
if (new_x1 >= new_x2 || new_y1 >= new_y2)
3568
return art_uta_new (clip_x1, clip_y1, clip_x1 + 1, clip_y1 + 1);
3570
/* Make the new clipped union */
3572
uta = art_new (ArtUta, 1);
3575
uta->width = new_x2 - new_x1;
3576
uta->height = new_y2 - new_y1;
3577
uta->utiles = utiles = art_new (ArtUtaBbox, uta->width * uta->height);
3582
for (y = new_y1; y < new_y2; y++) {
3584
ofs1 = (y - uta1->y0) * uta1->width + new_x1 - uta1->x0;
3587
ofs2 = (y - uta2->y0) * uta2->width + new_x1 - uta2->x0;
3589
for (x = new_x1; x < new_x2; x++) {
3590
ArtUtaBbox bb1, bb2, bb;
3593
|| x < uta1->x0 || y < uta1->y0
3594
|| x >= uta1->x0 + uta1->width || y >= uta1->y0 + uta1->height)
3597
bb1 = uta1->utiles[ofs1];
3600
|| x < uta2->x0 || y < uta2->y0
3601
|| x >= uta2->x0 + uta2->width || y >= uta2->y0 + uta2->height)
3604
bb2 = uta2->utiles[ofs2];
3611
bb = ART_UTA_BBOX_CONS (MIN (ART_UTA_BBOX_X0 (bb1),
3612
ART_UTA_BBOX_X0 (bb2)),
3613
MIN (ART_UTA_BBOX_Y0 (bb1),
3614
ART_UTA_BBOX_Y0 (bb2)),
3615
MAX (ART_UTA_BBOX_X1 (bb1),
3616
ART_UTA_BBOX_X1 (bb2)),
3617
MAX (ART_UTA_BBOX_Y1 (bb1),
3618
ART_UTA_BBOX_Y1 (bb2)));
3632
get_visible_region (GnomeCanvas *canvas, ArtIRect *visible)
3634
visible->x0 = canvas->layout.hadjustment->value - canvas->zoom_xofs;
3635
visible->y0 = canvas->layout.vadjustment->value - canvas->zoom_yofs;
3636
visible->x1 = visible->x0 + GTK_WIDGET (canvas)->allocation.width;
3637
visible->y1 = visible->y0 + GTK_WIDGET (canvas)->allocation.height;
3641
* gnome_canvas_request_redraw_uta:
3642
* @canvas: A canvas.
3643
* @uta: Microtile array that specifies the area to be redrawn. It will
3644
* be freed by this function, so the argument you pass will be invalid
3645
* after you call this function.
3647
* Informs a canvas that the specified area, given as a microtile array, needs
3648
* to be repainted. To be used only by item implementations.
3651
gnome_canvas_request_redraw_uta (GnomeCanvas *canvas,
3656
g_return_if_fail (GNOME_IS_CANVAS (canvas));
3657
g_return_if_fail (uta != NULL);
3659
if (!GTK_WIDGET_DRAWABLE (canvas)) {
3664
get_visible_region (canvas, &visible);
3666
if (canvas->need_redraw) {
3669
g_assert (canvas->redraw_area != NULL);
3670
/* ALEX: This can fail if e.g. redraw_uta is called by an item
3671
update function and we're called from update_now -> do_update
3672
because update_now sets idle_id == 0. There is also some way
3673
to get it from the expose handler (see bug #102811).
3674
g_assert (canvas->idle_id != 0); */
3676
new_uta = uta_union_clip (canvas->redraw_area, uta, &visible);
3677
art_uta_free (canvas->redraw_area);
3679
canvas->redraw_area = new_uta;
3680
if (canvas->idle_id == 0)
3685
g_assert (canvas->redraw_area == NULL);
3687
new_uta = uta_union_clip (uta, NULL, &visible);
3689
canvas->redraw_area = new_uta;
3691
canvas->need_redraw = TRUE;
3698
* gnome_canvas_request_redraw:
3699
* @canvas: A canvas.
3700
* @x1: Leftmost coordinate of the rectangle to be redrawn.
3701
* @y1: Upper coordinate of the rectangle to be redrawn.
3702
* @x2: Rightmost coordinate of the rectangle to be redrawn, plus 1.
3703
* @y2: Lower coordinate of the rectangle to be redrawn, plus 1.
3705
* Convenience function that informs a canvas that the specified rectangle needs
3706
* to be repainted. This function converts the rectangle to a microtile array
3707
* and feeds it to gnome_canvas_request_redraw_uta(). The rectangle includes
3708
* @x1 and @y1, but not @x2 and @y2. To be used only by item implementations.
3711
gnome_canvas_request_redraw (GnomeCanvas *canvas, int x1, int y1, int x2, int y2)
3718
g_return_if_fail (GNOME_IS_CANVAS (canvas));
3720
if (!GTK_WIDGET_DRAWABLE (canvas) || (x1 >= x2) || (y1 >= y2))
3728
get_visible_region (canvas, &visible);
3730
art_irect_intersect (&clip, &bbox, &visible);
3732
if (!art_irect_empty (&clip)) {
3733
uta = art_uta_from_irect (&clip);
3734
gnome_canvas_request_redraw_uta (canvas, uta);
3740
* gnome_canvas_w2c_affine:
3741
* @canvas: A canvas.
3742
* @affine: An affine transformation matrix (return value).
3744
* Gets the affine transform that converts from world coordinates to canvas
3745
* pixel coordinates.
3748
gnome_canvas_w2c_affine (GnomeCanvas *canvas, double affine[6])
3752
g_return_if_fail (GNOME_IS_CANVAS (canvas));
3753
g_return_if_fail (affine != NULL);
3755
zooom = canvas->pixels_per_unit;
3761
affine[4] = -canvas->scroll_x1 * zooom;
3762
affine[5] = -canvas->scroll_y1 * zooom;
3767
* @canvas: A canvas.
3768
* @wx: World X coordinate.
3769
* @wy: World Y coordinate.
3770
* @cx: X pixel coordinate (return value).
3771
* @cy: Y pixel coordinate (return value).
3773
* Converts world coordinates into canvas pixel coordinates.
3776
gnome_canvas_w2c (GnomeCanvas *canvas, double wx, double wy, int *cx, int *cy)
3781
g_return_if_fail (GNOME_IS_CANVAS (canvas));
3783
gnome_canvas_w2c_affine (canvas, affine);
3786
art_affine_point (&c, &w, affine);
3788
*cx = floor (c.x + 0.5);
3790
*cy = floor (c.y + 0.5);
3794
* gnome_canvas_w2c_d:
3795
* @canvas: A canvas.
3796
* @wx: World X coordinate.
3797
* @wy: World Y coordinate.
3798
* @cx: X pixel coordinate (return value).
3799
* @cy: Y pixel coordinate (return value).
3801
* Converts world coordinates into canvas pixel coordinates. This
3802
* version returns coordinates in floating point coordinates, for
3803
* greater precision.
3806
gnome_canvas_w2c_d (GnomeCanvas *canvas, double wx, double wy, double *cx, double *cy)
3811
g_return_if_fail (GNOME_IS_CANVAS (canvas));
3813
gnome_canvas_w2c_affine (canvas, affine);
3816
art_affine_point (&c, &w, affine);
3826
* @canvas: A canvas.
3827
* @cx: Canvas pixel X coordinate.
3828
* @cy: Canvas pixel Y coordinate.
3829
* @wx: X world coordinate (return value).
3830
* @wy: Y world coordinate (return value).
3832
* Converts canvas pixel coordinates to world coordinates.
3835
gnome_canvas_c2w (GnomeCanvas *canvas, int cx, int cy, double *wx, double *wy)
3837
double affine[6], inv[6];
3840
g_return_if_fail (GNOME_IS_CANVAS (canvas));
3842
gnome_canvas_w2c_affine (canvas, affine);
3843
art_affine_invert (inv, affine);
3846
art_affine_point (&w, &c, inv);
3855
* gnome_canvas_window_to_world:
3856
* @canvas: A canvas.
3857
* @winx: Window-relative X coordinate.
3858
* @winy: Window-relative Y coordinate.
3859
* @worldx: X world coordinate (return value).
3860
* @worldy: Y world coordinate (return value).
3862
* Converts window-relative coordinates into world coordinates. You can use
3863
* this when you need to convert mouse coordinates into world coordinates, for
3867
gnome_canvas_window_to_world (GnomeCanvas *canvas, double winx, double winy,
3868
double *worldx, double *worldy)
3870
g_return_if_fail (GNOME_IS_CANVAS (canvas));
3873
*worldx = canvas->scroll_x1 + ((winx - canvas->zoom_xofs)
3874
/ canvas->pixels_per_unit);
3877
*worldy = canvas->scroll_y1 + ((winy - canvas->zoom_yofs)
3878
/ canvas->pixels_per_unit);
3883
* gnome_canvas_world_to_window:
3884
* @canvas: A canvas.
3885
* @worldx: World X coordinate.
3886
* @worldy: World Y coordinate.
3887
* @winx: X window-relative coordinate.
3888
* @winy: Y window-relative coordinate.
3890
* Converts world coordinates into window-relative coordinates.
3893
gnome_canvas_world_to_window (GnomeCanvas *canvas, double worldx, double worldy,
3894
double *winx, double *winy)
3896
g_return_if_fail (GNOME_IS_CANVAS (canvas));
3899
*winx = (canvas->pixels_per_unit)*(worldx - canvas->scroll_x1) + canvas->zoom_xofs;
3902
*winy = (canvas->pixels_per_unit)*(worldy - canvas->scroll_y1) + canvas->zoom_yofs;
3908
* gnome_canvas_get_color:
3909
* @canvas: A canvas.
3910
* @spec: X color specification, or NULL for "transparent".
3911
* @color: Returns the allocated color.
3913
* Allocates a color based on the specified X color specification. As a
3914
* convenience to item implementations, it returns TRUE if the color was
3915
* allocated, or FALSE if the specification was NULL. A NULL color
3916
* specification is considered as "transparent" by the canvas.
3918
* Return value: TRUE if @spec is non-NULL and the color is allocated. If @spec
3919
* is NULL, then returns FALSE.
3922
gnome_canvas_get_color (GnomeCanvas *canvas, const char *spec, GdkColor *color)
3924
GdkColormap *colormap;
3926
g_return_val_if_fail (GNOME_IS_CANVAS (canvas), FALSE);
3927
g_return_val_if_fail (color != NULL, FALSE);
3937
gdk_color_parse (spec, color);
3939
colormap = gtk_widget_get_colormap (GTK_WIDGET (canvas));
3941
gdk_rgb_find_color (colormap, color);
3947
* gnome_canvas_get_color_pixel:
3948
* @canvas: A canvas.
3949
* @rgba: RGBA color specification.
3951
* Allocates a color from the RGBA value passed into this function. The alpha
3952
* opacity value is discarded, since normal X colors do not support it.
3954
* Return value: Allocated pixel value corresponding to the specified color.
3957
gnome_canvas_get_color_pixel (GnomeCanvas *canvas, guint rgba)
3959
GdkColormap *colormap;
3962
g_return_val_if_fail (GNOME_IS_CANVAS (canvas), 0);
3964
color.red = ((rgba & 0xff000000) >> 16) + ((rgba & 0xff000000) >> 24);
3965
color.green = ((rgba & 0x00ff0000) >> 8) + ((rgba & 0x00ff0000) >> 16);
3966
color.blue = (rgba & 0x0000ff00) + ((rgba & 0x0000ff00) >> 8);
3969
colormap = gtk_widget_get_colormap (GTK_WIDGET (canvas));
3971
gdk_rgb_find_color (colormap, &color);
3978
* gnome_canvas_set_stipple_origin:
3979
* @canvas: A canvas.
3980
* @gc: GC on which to set the stipple origin.
3982
* Sets the stipple origin of the specified GC as is appropriate for the canvas,
3983
* so that it will be aligned with other stipple patterns used by canvas items.
3984
* This is typically only needed by item implementations.
3987
gnome_canvas_set_stipple_origin (GnomeCanvas *canvas, GdkGC *gc)
3989
g_return_if_fail (GNOME_IS_CANVAS (canvas));
3990
g_return_if_fail (GDK_IS_GC (gc));
3992
gdk_gc_set_ts_origin (gc, -canvas->draw_xofs, -canvas->draw_yofs);
3996
* gnome_canvas_set_dither:
3997
* @canvas: A canvas.
3998
* @dither: Type of dithering used to render an antialiased canvas.
4000
* Controls dithered rendering for antialiased canvases. The value of
4001
* dither should be #GDK_RGB_DITHER_NONE, #GDK_RGB_DITHER_NORMAL, or
4002
* #GDK_RGB_DITHER_MAX. The default canvas setting is
4003
* #GDK_RGB_DITHER_NORMAL.
4006
gnome_canvas_set_dither (GnomeCanvas *canvas, GdkRgbDither dither)
4008
g_return_if_fail (GNOME_IS_CANVAS (canvas));
4010
canvas->dither = dither;
4014
* gnome_canvas_get_dither:
4015
* @canvas: A canvas.
4017
* Returns the type of dithering used to render an antialiased canvas.
4019
* Return value: The dither setting.
4022
gnome_canvas_get_dither (GnomeCanvas *canvas)
4024
g_return_val_if_fail (GNOME_IS_CANVAS (canvas), GDK_RGB_DITHER_NONE);
4026
return canvas->dither;
4030
boolean_handled_accumulator (GSignalInvocationHint *ihint,
4031
GValue *return_accu,
4032
const GValue *handler_return,
4035
gboolean continue_emission;
4036
gboolean signal_handled;
4038
signal_handled = g_value_get_boolean (handler_return);
4039
g_value_set_boolean (return_accu, signal_handled);
4040
continue_emission = !signal_handled;
4042
return continue_emission;
4045
/* Class initialization function for GnomeCanvasItemClass */
4047
gnome_canvas_item_class_init (GnomeCanvasItemClass *class)
4049
GObjectClass *gobject_class;
4051
gobject_class = (GObjectClass *) class;
4053
item_parent_class = g_type_class_peek_parent (class);
4055
gobject_class->set_property = gnome_canvas_item_set_property;
4056
gobject_class->get_property = gnome_canvas_item_get_property;
4058
g_object_class_install_property
4059
(gobject_class, ITEM_PROP_PARENT,
4060
g_param_spec_object ("parent", NULL, NULL,
4061
GNOME_TYPE_CANVAS_ITEM,
4062
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
4064
item_signals[ITEM_EVENT] =
4065
g_signal_new ("event",
4066
G_TYPE_FROM_CLASS (class),
4068
G_STRUCT_OFFSET (GnomeCanvasItemClass, event),
4069
boolean_handled_accumulator, NULL,
4070
gnome_canvas_marshal_BOOLEAN__BOXED,
4072
GDK_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE);
4074
gobject_class->dispose = gnome_canvas_item_dispose;
4076
class->realize = gnome_canvas_item_realize;
4077
class->unrealize = gnome_canvas_item_unrealize;
4078
class->map = gnome_canvas_item_map;
4079
class->unmap = gnome_canvas_item_unmap;
4080
class->update = gnome_canvas_item_update;
added
removed
src/libgnomecanvas/gnome-canvas.c
