--- /dev/null
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: 8; c-basic-offset: 8 -*- */
+/*
+ * Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation
+ * All rights reserved.
+ *
+ * This file is part of the Gnome Library.
+ *
+ * The Gnome Library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * The Gnome Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with the Gnome Library; see the file COPYING.LIB. If not,
+ * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+/*
+ @NOTATION@
+ */
+/*
+ * GnomeCanvas widget - Tk-like canvas widget for Gnome
+ *
+ * GnomeCanvas is basically a port of the Tk toolkit's most excellent canvas widget. Tk is
+ * copyrighted by the Regents of the University of California, Sun Microsystems, and other parties.
+ *
+ *
+ * Authors: Federico Mena <federico@nuclecu.unam.mx>
+ * Raph Levien <raph@gimp.org>
+ */
+
+/*
+ * TO-DO list for the canvas:
+ *
+ * - Allow to specify whether GnomeCanvasImage sizes are in units or pixels (scale or don't scale).
+ *
+ * - Implement a flag for gnome_canvas_item_reparent() that tells the function to keep the item
+ * visually in the same place, that is, to keep it in the same place with respect to the canvas
+ * origin.
+ *
+ * - GC put functions for items.
+ *
+ * - Widget item (finish it).
+ *
+ * - GList *gnome_canvas_gimme_all_items_contained_in_this_area (GnomeCanvas *canvas, Rectangle area);
+ *
+ * - Retrofit all the primitive items with microtile support.
+ *
+ * - Curve support for line item.
+ *
+ * - Arc item (Havoc has it; to be integrated in GnomeCanvasEllipse).
+ *
+ * - Sane font handling API.
+ *
+ * - Get_arg methods for items:
+ * - How to fetch the outline width and know whether it is in pixels or units?
+ */
+
+/*
+ * Raph's TODO list for the antialiased canvas integration:
+ *
+ * - ::point() method for text item not accurate when affine transformed.
+ *
+ * - Clip rectangle not implemented in aa renderer for text item.
+ *
+ * - Clip paths only partially implemented.
+ *
+ * - Add more image loading techniques to work around imlib deficiencies.
+ */
+
+#include <config.h>
+
+#include <math.h>
+#include <string.h>
+#include <stdio.h>
+#include <gdk/gdkprivate.h>
+#include <gtk/gtk.h>
+#include "gnome-canvas.h"
+#include "gnome-canvas-i18n.h"
+#include "libart_lgpl/art_rect.h"
+#include "libart_lgpl/art_rect_uta.h"
+#include "libart_lgpl/art_uta_rect.h"
+#include "libart_lgpl/art_uta_ops.h"
+
+#include "gnome-canvas-marshal.h"
+#include "gnome-canvas-marshal.c"
+
+
+/* We must run our idle update handler *before* GDK wants to redraw. */
+#define CANVAS_IDLE_PRIORITY (GDK_PRIORITY_REDRAW - 5)
+
+
+static void gnome_canvas_request_update (GnomeCanvas *canvas);
+static void group_add (GnomeCanvasGroup *group,
+ GnomeCanvasItem *item);
+static void group_remove (GnomeCanvasGroup *group,
+ GnomeCanvasItem *item);
+static void add_idle (GnomeCanvas *canvas);
+
+
+/*** GnomeCanvasItem ***/
+
+/* Some convenience stuff */
+#define GCI_UPDATE_MASK (GNOME_CANVAS_UPDATE_REQUESTED | GNOME_CANVAS_UPDATE_AFFINE | GNOME_CANVAS_UPDATE_CLIP | GNOME_CANVAS_UPDATE_VISIBILITY)
+#define GCI_EPSILON 1e-18
+#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])
+
+enum {
+ ITEM_PROP_0,
+ ITEM_PROP_PARENT
+};
+
+enum {
+ ITEM_EVENT,
+ ITEM_LAST_SIGNAL
+};
+
+static void gnome_canvas_item_class_init (GnomeCanvasItemClass *class);
+static void gnome_canvas_item_init (GnomeCanvasItem *item);
+static int emit_event (GnomeCanvas *canvas, GdkEvent *event);
+
+static guint item_signals[ITEM_LAST_SIGNAL];
+
+static GtkObjectClass *item_parent_class;
+
+
+/**
+ * gnome_canvas_item_get_type:
+ *
+ * Registers the &GnomeCanvasItem class if necessary, and returns the type ID
+ * associated to it.
+ *
+ * Return value: The type ID of the &GnomeCanvasItem class.
+ **/
+GType
+gnome_canvas_item_get_type (void)
+{
+ static GType canvas_item_type;
+
+ if (!canvas_item_type) {
+ const GTypeInfo object_info = {
+ sizeof (GnomeCanvasItemClass),
+ (GBaseInitFunc) NULL,
+ (GBaseFinalizeFunc) NULL,
+ (GClassInitFunc) gnome_canvas_item_class_init,
+ (GClassFinalizeFunc) NULL,
+ NULL, /* class_data */
+ sizeof (GnomeCanvasItem),
+ 0, /* n_preallocs */
+ (GInstanceInitFunc) gnome_canvas_item_init,
+ NULL /* value_table */
+ };
+
+ canvas_item_type = g_type_register_static (GTK_TYPE_OBJECT, "GnomeCanvasItem",
+ &object_info, 0);
+ }
+
+ return canvas_item_type;
+}
+
+/* Object initialization function for GnomeCanvasItem */
+static void
+gnome_canvas_item_init (GnomeCanvasItem *item)
+{
+ item->object.flags |= GNOME_CANVAS_ITEM_VISIBLE;
+}
+
+/**
+ * gnome_canvas_item_new:
+ * @parent: The parent group for the new item.
+ * @type: The object type of the item.
+ * @first_arg_name: A list of object argument name/value pairs, NULL-terminated,
+ * used to configure the item. For example, "fill_color", "black",
+ * "width_units", 5.0, NULL.
+ * @Varargs:
+ *
+ * Creates a new canvas item with @parent as its parent group. The item is
+ * created at the top of its parent's stack, and starts up as visible. The item
+ * is of the specified @type, for example, it can be
+ * gnome_canvas_rect_get_type(). The list of object arguments/value pairs is
+ * used to configure the item. If you need to pass construct time parameters, you
+ * should use g_object_new() to pass the parameters and
+ * gnome_canvas_item_construct() to set up the canvas item.
+ *
+ * Return value: The newly-created item.
+ **/
+GnomeCanvasItem *
+gnome_canvas_item_new (GnomeCanvasGroup *parent, GType type, const gchar *first_arg_name, ...)
+{
+ GnomeCanvasItem *item;
+ va_list args;
+
+ g_return_val_if_fail (GNOME_IS_CANVAS_GROUP (parent), NULL);
+ g_return_val_if_fail (g_type_is_a (type, gnome_canvas_item_get_type ()), NULL);
+
+ item = GNOME_CANVAS_ITEM (g_object_new (type, NULL));
+
+ va_start (args, first_arg_name);
+ gnome_canvas_item_construct (item, parent, first_arg_name, args);
+ va_end (args);
+
+ return item;
+}
+
+
+/* Performs post-creation operations on a canvas item (adding it to its parent
+ * group, etc.)
+ */
+static void
+item_post_create_setup (GnomeCanvasItem *item)
+{
+ group_add (GNOME_CANVAS_GROUP (item->parent), item);
+
+ gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2 + 1, item->y2 + 1);
+ item->canvas->need_repick = TRUE;
+}
+
+/* Set_property handler for canvas items */
+static void
+gnome_canvas_item_set_property (GObject *gobject, guint param_id,
+ const GValue *value, GParamSpec *pspec)
+{
+ GnomeCanvasItem *item;
+
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (gobject));
+
+ item = GNOME_CANVAS_ITEM (gobject);
+
+ switch (param_id) {
+ case ITEM_PROP_PARENT:
+ if (item->parent != NULL) {
+ g_warning ("Cannot set `parent' argument after item has "
+ "already been constructed.");
+ } else if (g_value_get_object (value)) {
+ item->parent = GNOME_CANVAS_ITEM (g_value_get_object (value));
+ item->canvas = item->parent->canvas;
+ item_post_create_setup (item);
+ }
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec);
+ break;
+ }
+}
+
+/* Get_property handler for canvas items */
+static void
+gnome_canvas_item_get_property (GObject *gobject, guint param_id,
+ GValue *value, GParamSpec *pspec)
+{
+ GnomeCanvasItem *item;
+
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (gobject));
+
+ item = GNOME_CANVAS_ITEM (gobject);
+
+ switch (param_id) {
+ case ITEM_PROP_PARENT:
+ g_value_set_object (value, item->parent);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec);
+ break;
+ }
+}
+
+/**
+ * gnome_canvas_item_construct:
+ * @item: An unconstructed canvas item.
+ * @parent: The parent group for the item.
+ * @first_arg_name: The name of the first argument for configuring the item.
+ * @args: The list of arguments used to configure the item.
+ *
+ * Constructs a canvas item; meant for use only by item implementations.
+ **/
+void
+gnome_canvas_item_construct (GnomeCanvasItem *item, GnomeCanvasGroup *parent,
+ const gchar *first_arg_name, va_list args)
+{
+ g_return_if_fail (GNOME_IS_CANVAS_GROUP (parent));
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+
+ item->parent = GNOME_CANVAS_ITEM (parent);
+ item->canvas = item->parent->canvas;
+
+ g_object_set_valist (G_OBJECT (item), first_arg_name, args);
+
+ item_post_create_setup (item);
+}
+
+
+/* If the item is visible, requests a redraw of it. */
+static void
+redraw_if_visible (GnomeCanvasItem *item)
+{
+ if (item->object.flags & GNOME_CANVAS_ITEM_VISIBLE)
+ gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2 + 1, item->y2 + 1);
+}
+
+/* Standard object dispose function for canvas items */
+static void
+gnome_canvas_item_dispose (GObject *object)
+{
+ GnomeCanvasItem *item;
+
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (object));
+
+ item = GNOME_CANVAS_ITEM (object);
+
+ if (item->canvas)
+ redraw_if_visible (item);
+
+ /* Make the canvas forget about us */
+
+ if (item->canvas && item == item->canvas->current_item) {
+ item->canvas->current_item = NULL;
+ item->canvas->need_repick = TRUE;
+ }
+
+ if (item->canvas && item == item->canvas->new_current_item) {
+ item->canvas->new_current_item = NULL;
+ item->canvas->need_repick = TRUE;
+ }
+
+ if (item->canvas && item == item->canvas->grabbed_item) {
+ item->canvas->grabbed_item = NULL;
+ gdk_pointer_ungrab (GDK_CURRENT_TIME);
+ }
+
+ if (item->canvas && item == item->canvas->focused_item)
+ item->canvas->focused_item = NULL;
+
+ /* Normal destroy stuff */
+
+ if (item->object.flags & GNOME_CANVAS_ITEM_MAPPED)
+ (* GNOME_CANVAS_ITEM_GET_CLASS (item)->unmap) (item);
+
+ if (item->object.flags & GNOME_CANVAS_ITEM_REALIZED)
+ (* GNOME_CANVAS_ITEM_GET_CLASS (item)->unrealize) (item);
+
+ if (item->parent)
+ group_remove (GNOME_CANVAS_GROUP (item->parent), item);
+
+ g_free (item->xform);
+ item->xform = NULL;
+
+ G_OBJECT_CLASS (item_parent_class)->dispose (object);
+ /* items should remove any reference to item->canvas after the
+ first ::destroy */
+ item->canvas = NULL;
+}
+
+/* Realize handler for canvas items */
+static void
+gnome_canvas_item_realize (GnomeCanvasItem *item)
+{
+ GTK_OBJECT_SET_FLAGS (item, GNOME_CANVAS_ITEM_REALIZED);
+
+ gnome_canvas_item_request_update (item);
+}
+
+/* Unrealize handler for canvas items */
+static void
+gnome_canvas_item_unrealize (GnomeCanvasItem *item)
+{
+ GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_REALIZED);
+}
+
+/* Map handler for canvas items */
+static void
+gnome_canvas_item_map (GnomeCanvasItem *item)
+{
+ GTK_OBJECT_SET_FLAGS (item, GNOME_CANVAS_ITEM_MAPPED);
+}
+
+/* Unmap handler for canvas items */
+static void
+gnome_canvas_item_unmap (GnomeCanvasItem *item)
+{
+ GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_MAPPED);
+}
+
+/* Update handler for canvas items */
+static void
+gnome_canvas_item_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
+{
+ GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_NEED_UPDATE);
+ GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_NEED_AFFINE);
+ GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_NEED_CLIP);
+ GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_NEED_VIS);
+}
+
+#define noHACKISH_AFFINE
+
+/*
+ * This routine invokes the update method of the item
+ * Please notice, that we take parent to canvas pixel matrix as argument
+ * unlike virtual method ::update, whose argument is item 2 canvas pixel
+ * matrix
+ *
+ * I will try to force somewhat meaningful naming for affines (Lauris)
+ * General naming rule is FROM2TO, where FROM and TO are abbreviations
+ * So p2cpx is Parent2CanvasPixel and i2cpx is Item2CanvasPixel
+ * I hope that this helps to keep track of what really happens
+ *
+ */
+
+static void
+gnome_canvas_item_invoke_update (GnomeCanvasItem *item, double *p2cpx, ArtSVP *clip_path, int flags)
+{
+ int child_flags;
+ gdouble i2cpx[6];
+
+#ifdef HACKISH_AFFINE
+ double i2w[6], w2c[6], i2c[6];
+#endif
+
+ child_flags = flags;
+ if (!(item->object.flags & GNOME_CANVAS_ITEM_VISIBLE))
+ child_flags &= ~GNOME_CANVAS_UPDATE_IS_VISIBLE;
+
+ /* Calculate actual item transformation matrix */
+
+ if (item->xform) {
+ if (item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL) {
+ /* Item has full affine */
+ art_affine_multiply (i2cpx, item->xform, p2cpx);
+ } else {
+ /* Item has only translation */
+ memcpy (i2cpx, p2cpx, 4 * sizeof (gdouble));
+ i2cpx[4] = item->xform[0] * p2cpx[0] + item->xform[1] * p2cpx[2] + p2cpx[4];
+ i2cpx[5] = item->xform[0] * p2cpx[1] + item->xform[1] * p2cpx[3] + p2cpx[5];
+ }
+ } else {
+ /* Item has no matrix (i.e. identity) */
+ memcpy (i2cpx, p2cpx, 6 * sizeof (gdouble));
+ }
+
+#ifdef HACKISH_AFFINE
+ gnome_canvas_item_i2w_affine (item, i2w);
+ gnome_canvas_w2c_affine (item->canvas, w2c);
+ art_affine_multiply (i2c, i2w, w2c);
+ /* invariant (doesn't hold now): child_affine == i2c */
+ child_affine = i2c;
+#endif
+
+ /* apply object flags to child flags */
+
+ child_flags &= ~GNOME_CANVAS_UPDATE_REQUESTED;
+
+ if (item->object.flags & GNOME_CANVAS_ITEM_NEED_UPDATE)
+ child_flags |= GNOME_CANVAS_UPDATE_REQUESTED;
+
+ if (item->object.flags & GNOME_CANVAS_ITEM_NEED_AFFINE)
+ child_flags |= GNOME_CANVAS_UPDATE_AFFINE;
+
+ if (item->object.flags & GNOME_CANVAS_ITEM_NEED_CLIP)
+ child_flags |= GNOME_CANVAS_UPDATE_CLIP;
+
+ if (item->object.flags & GNOME_CANVAS_ITEM_NEED_VIS)
+ child_flags |= GNOME_CANVAS_UPDATE_VISIBILITY;
+
+ if (child_flags & GCI_UPDATE_MASK) {
+ if (GNOME_CANVAS_ITEM_GET_CLASS (item)->update)
+ GNOME_CANVAS_ITEM_GET_CLASS (item)->update (item, i2cpx, clip_path, child_flags);
+ }
+}
+
+/*
+ * This routine invokes the point method of the item.
+ * The arguments x, y should be in the parent item local coordinates.
+ *
+ * This is potentially evil, as we are relying on matrix inversion (Lauris)
+ */
+
+static double
+gnome_canvas_item_invoke_point (GnomeCanvasItem *item, double x, double y, int cx, int cy, GnomeCanvasItem **actual_item)
+{
+ /* Calculate x & y in item local coordinates */
+
+ if (item->xform) {
+ if (item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL) {
+ gdouble p2i[6], t;
+ /* Item has full affine */
+ art_affine_invert (p2i, item->xform);
+ t = x * p2i[0] + y * p2i[2] + p2i[4];
+ y = x * p2i[1] + y * p2i[3] + p2i[5];
+ x = t;
+ } else {
+ /* Item has only translation */
+ x -= item->xform[0];
+ y -= item->xform[1];
+ }
+ }
+
+#ifdef HACKISH_AFFINE
+ double i2w[6], w2c[6], i2c[6], c2i[6];
+ ArtPoint c, i;
+#endif
+
+#ifdef HACKISH_AFFINE
+ gnome_canvas_item_i2w_affine (item, i2w);
+ gnome_canvas_w2c_affine (item->canvas, w2c);
+ art_affine_multiply (i2c, i2w, w2c);
+ art_affine_invert (c2i, i2c);
+ c.x = cx;
+ c.y = cy;
+ art_affine_point (&i, &c, c2i);
+ x = i.x;
+ y = i.y;
+#endif
+
+ if (GNOME_CANVAS_ITEM_GET_CLASS (item)->point)
+ return GNOME_CANVAS_ITEM_GET_CLASS (item)->point (item, x, y, cx, cy, actual_item);
+
+ return 1e18;
+}
+
+/**
+ * gnome_canvas_item_set:
+ * @item: A canvas item.
+ * @first_arg_name: The list of object argument name/value pairs used to configure the item.
+ * @Varargs:
+ *
+ * Configures a canvas item. The arguments in the item are set to the specified
+ * values, and the item is repainted as appropriate.
+ **/
+void
+gnome_canvas_item_set (GnomeCanvasItem *item, const gchar *first_arg_name, ...)
+{
+ va_list args;
+
+ va_start (args, first_arg_name);
+ gnome_canvas_item_set_valist (item, first_arg_name, args);
+ va_end (args);
+}
+
+
+/**
+ * gnome_canvas_item_set_valist:
+ * @item: A canvas item.
+ * @first_arg_name: The name of the first argument used to configure the item.
+ * @args: The list of object argument name/value pairs used to configure the item.
+ *
+ * Configures a canvas item. The arguments in the item are set to the specified
+ * values, and the item is repainted as appropriate.
+ **/
+void
+gnome_canvas_item_set_valist (GnomeCanvasItem *item, const gchar *first_arg_name, va_list args)
+{
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+
+ g_object_set_valist (G_OBJECT (item), first_arg_name, args);
+
+#if 0
+ /* I commented this out, because item implementations have to schedule update/redraw */
+ redraw_if_visible (item);
+#endif
+
+ item->canvas->need_repick = TRUE;
+}
+
+
+/**
+ * gnome_canvas_item_affine_relative:
+ * @item: A canvas item.
+ * @affine: An affine transformation matrix.
+ *
+ * Combines the specified affine transformation matrix with the item's current
+ * transformation. NULL affine is not allowed.
+ **/
+#define GCIAR_EPSILON 1e-6
+void
+gnome_canvas_item_affine_relative (GnomeCanvasItem *item, const double affine[6])
+{
+ gdouble i2p[6];
+
+ g_return_if_fail (item != NULL);
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+ g_return_if_fail (affine != NULL);
+
+ /* Calculate actual item transformation matrix */
+
+ if (item->xform) {
+ if (item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL) {
+ /* Item has full affine */
+ art_affine_multiply (i2p, affine, item->xform);
+ } else {
+ /* Item has only translation */
+ memcpy (i2p, affine, 6 * sizeof (gdouble));
+ i2p[4] += item->xform[0];
+ i2p[5] += item->xform[1];
+ }
+ } else {
+ /* Item has no matrix (i.e. identity) */
+ memcpy (i2p, affine, 6 * sizeof (gdouble));
+ }
+
+ gnome_canvas_item_affine_absolute (item, i2p);
+}
+
+/**
+ * gnome_canvas_item_affine_absolute:
+ * @item: A canvas item.
+ * @affine: An affine transformation matrix.
+ *
+ * Makes the item's affine transformation matrix be equal to the specified
+ * matrix. NULL affine is treated as identity.
+ **/
+void
+gnome_canvas_item_affine_absolute (GnomeCanvasItem *item, const double i2p[6])
+{
+ g_return_if_fail (item != NULL);
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+
+ if (i2p &&
+ (fabs (i2p[0] - 1.0) < GCI_EPSILON) &&
+ (fabs (i2p[1] - 0.0) < GCI_EPSILON) &&
+ (fabs (i2p[2] - 0.0) < GCI_EPSILON) &&
+ (fabs (i2p[3] - 1.0) < GCI_EPSILON) &&
+ (fabs (i2p[4] - 0.0) < GCI_EPSILON) &&
+ (fabs (i2p[5] - 0.0) < GCI_EPSILON)) {
+ /* We are identity */
+ i2p = NULL;
+ }
+
+ if (i2p) {
+ if (item->xform && !(item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL)) {
+ /* We do not want to deal with translation-only affines */
+ g_free (item->xform);
+ item->xform = NULL;
+ }
+ if (!item->xform) item->xform = g_new (gdouble, 6);
+ memcpy (item->xform, i2p, 6 * sizeof (gdouble));
+ item->object.flags |= GNOME_CANVAS_ITEM_AFFINE_FULL;
+ } else {
+ if (item->xform) {
+ g_free (item->xform);
+ item->xform = NULL;
+ }
+ }
+
+ if (!(item->object.flags & GNOME_CANVAS_ITEM_NEED_AFFINE)) {
+ /* Request update */
+ item->object.flags |= GNOME_CANVAS_ITEM_NEED_AFFINE;
+ gnome_canvas_item_request_update (item);
+ }
+
+ item->canvas->need_repick = TRUE;
+}
+
+
+/**
+ * gnome_canvas_item_move:
+ * @item: A canvas item.
+ * @dx: Horizontal offset.
+ * @dy: Vertical offset.
+ *
+ * Moves a canvas item by creating an affine transformation matrix for
+ * translation by using the specified values. This happens in item
+ * local coordinate system, so if you have nontrivial transform, it
+ * most probably does not do, what you want.
+ **/
+void
+gnome_canvas_item_move (GnomeCanvasItem *item, double dx, double dy)
+{
+ double translate[6];
+
+ g_return_if_fail (item != NULL);
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+
+ art_affine_translate (translate, dx, dy);
+
+ gnome_canvas_item_affine_relative (item, translate);
+}
+
+/* Convenience function to reorder items in a group's child list. This puts the
+ * specified link after the "before" link. Returns TRUE if the list was changed.
+ */
+static gboolean
+put_item_after (GList *link, GList *before)
+{
+ GnomeCanvasGroup *parent;
+ GList *old_before, *old_after;
+ GList *after;
+
+ parent = GNOME_CANVAS_GROUP (GNOME_CANVAS_ITEM (link->data)->parent);
+
+ if (before)
+ after = before->next;
+ else
+ after = parent->item_list;
+
+ if (before == link || after == link)
+ return FALSE;
+
+ /* Unlink */
+
+ old_before = link->prev;
+ old_after = link->next;
+
+ if (old_before)
+ old_before->next = old_after;
+ else
+ parent->item_list = old_after;
+
+ if (old_after)
+ old_after->prev = old_before;
+ else
+ parent->item_list_end = old_before;
+
+ /* Relink */
+
+ link->prev = before;
+ if (before)
+ before->next = link;
+ else
+ parent->item_list = link;
+
+ link->next = after;
+ if (after)
+ after->prev = link;
+ else
+ parent->item_list_end = link;
+
+ return TRUE;
+}
+
+
+/**
+ * gnome_canvas_item_raise:
+ * @item: A canvas item.
+ * @positions: Number of steps to raise the item.
+ *
+ * Raises the item in its parent's stack by the specified number of positions.
+ * If the number of positions is greater than the distance to the top of the
+ * stack, then the item is put at the top.
+ **/
+void
+gnome_canvas_item_raise (GnomeCanvasItem *item, int positions)
+{
+ GList *link, *before;
+ GnomeCanvasGroup *parent;
+
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+ g_return_if_fail (positions >= 0);
+
+ if (!item->parent || positions == 0)
+ return;
+
+ parent = GNOME_CANVAS_GROUP (item->parent);
+ link = g_list_find (parent->item_list, item);
+ g_assert (link != NULL);
+
+ for (before = link; positions && before; positions--)
+ before = before->next;
+
+ if (!before)
+ before = parent->item_list_end;
+
+ if (put_item_after (link, before)) {
+ redraw_if_visible (item);
+ item->canvas->need_repick = TRUE;
+ }
+}
+
+
+/**
+ * gnome_canvas_item_lower:
+ * @item: A canvas item.
+ * @positions: Number of steps to lower the item.
+ *
+ * Lowers the item in its parent's stack by the specified number of positions.
+ * If the number of positions is greater than the distance to the bottom of the
+ * stack, then the item is put at the bottom.
+ **/
+void
+gnome_canvas_item_lower (GnomeCanvasItem *item, int positions)
+{
+ GList *link, *before;
+ GnomeCanvasGroup *parent;
+
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+ g_return_if_fail (positions >= 1);
+
+ if (!item->parent || positions == 0)
+ return;
+
+ parent = GNOME_CANVAS_GROUP (item->parent);
+ link = g_list_find (parent->item_list, item);
+ g_assert (link != NULL);
+
+ if (link->prev)
+ for (before = link->prev; positions && before; positions--)
+ before = before->prev;
+ else
+ before = NULL;
+
+ if (put_item_after (link, before)) {
+ redraw_if_visible (item);
+ item->canvas->need_repick = TRUE;
+ }
+}
+
+
+/**
+ * gnome_canvas_item_raise_to_top:
+ * @item: A canvas item.
+ *
+ * Raises an item to the top of its parent's stack.
+ **/
+void
+gnome_canvas_item_raise_to_top (GnomeCanvasItem *item)
+{
+ GList *link;
+ GnomeCanvasGroup *parent;
+
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+
+ if (!item->parent)
+ return;
+
+ parent = GNOME_CANVAS_GROUP (item->parent);
+ link = g_list_find (parent->item_list, item);
+ g_assert (link != NULL);
+
+ if (put_item_after (link, parent->item_list_end)) {
+ redraw_if_visible (item);
+ item->canvas->need_repick = TRUE;
+ }
+}
+
+
+/**
+ * gnome_canvas_item_lower_to_bottom:
+ * @item: A canvas item.
+ *
+ * Lowers an item to the bottom of its parent's stack.
+ **/
+void
+gnome_canvas_item_lower_to_bottom (GnomeCanvasItem *item)
+{
+ GList *link;
+ GnomeCanvasGroup *parent;
+
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+
+ if (!item->parent)
+ return;
+
+ parent = GNOME_CANVAS_GROUP (item->parent);
+ link = g_list_find (parent->item_list, item);
+ g_assert (link != NULL);
+
+ if (put_item_after (link, NULL)) {
+ redraw_if_visible (item);
+ item->canvas->need_repick = TRUE;
+ }
+}
+
+
+/**
+ * gnome_canvas_item_show:
+ * @item: A canvas item.
+ *
+ * Shows a canvas item. If the item was already shown, then no action is taken.
+ **/
+void
+gnome_canvas_item_show (GnomeCanvasItem *item)
+{
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+
+ if (!(item->object.flags & GNOME_CANVAS_ITEM_VISIBLE)) {
+ item->object.flags |= GNOME_CANVAS_ITEM_VISIBLE;
+ gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2 + 1, item->y2 + 1);
+ item->canvas->need_repick = TRUE;
+ }
+}
+
+
+/**
+ * gnome_canvas_item_hide:
+ * @item: A canvas item.
+ *
+ * Hides a canvas item. If the item was already hidden, then no action is
+ * taken.
+ **/
+void
+gnome_canvas_item_hide (GnomeCanvasItem *item)
+{
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+
+ if (item->object.flags & GNOME_CANVAS_ITEM_VISIBLE) {
+ item->object.flags &= ~GNOME_CANVAS_ITEM_VISIBLE;
+ gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2 + 1, item->y2 + 1);
+ item->canvas->need_repick = TRUE;
+ }
+}
+
+
+/**
+ * gnome_canvas_item_grab:
+ * @item: A canvas item.
+ * @event_mask: Mask of events that will be sent to this item.
+ * @cursor: If non-NULL, the cursor that will be used while the grab is active.
+ * @etime: The timestamp required for grabbing the mouse, or GDK_CURRENT_TIME.
+ *
+ * Specifies that all events that match the specified event mask should be sent
+ * to the specified item, and also grabs the mouse by calling
+ * gdk_pointer_grab(). The event mask is also used when grabbing the pointer.
+ * If @cursor is not NULL, then that cursor is used while the grab is active.
+ * The @etime parameter is the timestamp required for grabbing the mouse.
+ *
+ * Return value: If an item was already grabbed, it returns %GDK_GRAB_ALREADY_GRABBED. If
+ * the specified item was hidden by calling gnome_canvas_item_hide(), then it
+ * returns %GDK_GRAB_NOT_VIEWABLE. Else, it returns the result of calling
+ * gdk_pointer_grab().
+ **/
+int
+gnome_canvas_item_grab (GnomeCanvasItem *item, guint event_mask, GdkCursor *cursor, guint32 etime)
+{
+ int retval;
+
+ g_return_val_if_fail (GNOME_IS_CANVAS_ITEM (item), GDK_GRAB_NOT_VIEWABLE);
+ g_return_val_if_fail (GTK_WIDGET_MAPPED (item->canvas), GDK_GRAB_NOT_VIEWABLE);
+
+ if (item->canvas->grabbed_item)
+ return GDK_GRAB_ALREADY_GRABBED;
+
+ if (!(item->object.flags & GNOME_CANVAS_ITEM_VISIBLE))
+ return GDK_GRAB_NOT_VIEWABLE;
+
+ retval = gdk_pointer_grab (item->canvas->layout.bin_window,
+ FALSE,
+ event_mask,
+ NULL,
+ cursor,
+ etime);
+
+ if (retval != GDK_GRAB_SUCCESS)
+ return retval;
+
+ item->canvas->grabbed_item = item;
+ item->canvas->grabbed_event_mask = event_mask;
+ item->canvas->current_item = item; /* So that events go to the grabbed item */
+
+ return retval;
+}
+
+
+/**
+ * gnome_canvas_item_ungrab:
+ * @item: A canvas item that holds a grab.
+ * @etime: The timestamp for ungrabbing the mouse.
+ *
+ * Ungrabs the item, which must have been grabbed in the canvas, and ungrabs the
+ * mouse.
+ **/
+void
+gnome_canvas_item_ungrab (GnomeCanvasItem *item, guint32 etime)
+{
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+
+ if (item->canvas->grabbed_item != item)
+ return;
+
+ item->canvas->grabbed_item = NULL;
+
+ gdk_pointer_ungrab (etime);
+}
+
+
+/**
+ * gnome_canvas_item_i2w_affine:
+ * @item: A canvas item
+ * @affine: An affine transformation matrix (return value).
+ *
+ * Gets the affine transform that converts from the item's coordinate system to
+ * world coordinates.
+ **/
+void
+gnome_canvas_item_i2w_affine (GnomeCanvasItem *item, double affine[6])
+{
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+ g_return_if_fail (affine != NULL);
+
+ art_affine_identity (affine);
+
+ while (item) {
+ if (item->xform != NULL) {
+ if (item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL) {
+ art_affine_multiply (affine, affine, item->xform);
+ } else {
+ affine[4] += item->xform[0];
+ affine[5] += item->xform[1];
+ }
+ }
+
+ item = item->parent;
+ }
+}
+
+/**
+ * gnome_canvas_item_w2i:
+ * @item: A canvas item.
+ * @x: X coordinate to convert (input/output value).
+ * @y: Y coordinate to convert (input/output value).
+ *
+ * Converts a coordinate pair from world coordinates to item-relative
+ * coordinates.
+ **/
+void
+gnome_canvas_item_w2i (GnomeCanvasItem *item, double *x, double *y)
+{
+ double affine[6], inv[6];
+ ArtPoint w, i;
+
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+ g_return_if_fail (x != NULL);
+ g_return_if_fail (y != NULL);
+
+ gnome_canvas_item_i2w_affine (item, affine);
+ art_affine_invert (inv, affine);
+ w.x = *x;
+ w.y = *y;
+ art_affine_point (&i, &w, inv);
+ *x = i.x;
+ *y = i.y;
+}
+
+
+/**
+ * gnome_canvas_item_i2w:
+ * @item: A canvas item.
+ * @x: X coordinate to convert (input/output value).
+ * @y: Y coordinate to convert (input/output value).
+ *
+ * Converts a coordinate pair from item-relative coordinates to world
+ * coordinates.
+ **/
+void
+gnome_canvas_item_i2w (GnomeCanvasItem *item, double *x, double *y)
+{
+ double affine[6];
+ ArtPoint w, i;
+
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+ g_return_if_fail (x != NULL);
+ g_return_if_fail (y != NULL);
+
+ gnome_canvas_item_i2w_affine (item, affine);
+ i.x = *x;
+ i.y = *y;
+ art_affine_point (&w, &i, affine);
+ *x = w.x;
+ *y = w.y;
+}
+
+/**
+ * gnome_canvas_item_i2c_affine:
+ * @item: A canvas item.
+ * @affine: An affine transformation matrix (return value).
+ *
+ * Gets the affine transform that converts from item-relative coordinates to
+ * canvas pixel coordinates.
+ **/
+void
+gnome_canvas_item_i2c_affine (GnomeCanvasItem *item, double affine[6])
+{
+ double i2w[6], w2c[6];
+
+ gnome_canvas_item_i2w_affine (item, i2w);
+ gnome_canvas_w2c_affine (item->canvas, w2c);
+ art_affine_multiply (affine, i2w, w2c);
+}
+
+/* Returns whether the item is an inferior of or is equal to the parent. */
+static int
+is_descendant (GnomeCanvasItem *item, GnomeCanvasItem *parent)
+{
+ for (; item; item = item->parent)
+ if (item == parent)
+ return TRUE;
+
+ return FALSE;
+}
+
+/**
+ * gnome_canvas_item_reparent:
+ * @item: A canvas item.
+ * @new_group: A canvas group.
+ *
+ * Changes the parent of the specified item to be the new group. The item keeps
+ * its group-relative coordinates as for its old parent, so the item may change
+ * its absolute position within the canvas.
+ **/
+void
+gnome_canvas_item_reparent (GnomeCanvasItem *item, GnomeCanvasGroup *new_group)
+{
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+ g_return_if_fail (GNOME_IS_CANVAS_GROUP (new_group));
+
+ /* Both items need to be in the same canvas */
+ g_return_if_fail (item->canvas == GNOME_CANVAS_ITEM (new_group)->canvas);
+
+ /* The group cannot be an inferior of the item or be the item itself --
+ * this also takes care of the case where the item is the root item of
+ * the canvas. */
+ g_return_if_fail (!is_descendant (GNOME_CANVAS_ITEM (new_group), item));
+
+ /* Everything is ok, now actually reparent the item */
+
+ g_object_ref (G_OBJECT (item)); /* protect it from the unref in group_remove */
+
+ redraw_if_visible (item);
+
+ group_remove (GNOME_CANVAS_GROUP (item->parent), item);
+ item->parent = GNOME_CANVAS_ITEM (new_group);
+ group_add (new_group, item);
+
+ /* Redraw and repick */
+
+ redraw_if_visible (item);
+ item->canvas->need_repick = TRUE;
+
+ g_object_unref (G_OBJECT (item));
+}
+
+/**
+ * gnome_canvas_item_grab_focus:
+ * @item: A canvas item.
+ *
+ * Makes the specified item take the keyboard focus, so all keyboard events will
+ * be sent to it. If the canvas widget itself did not have the focus, it grabs
+ * it as well.
+ **/
+void
+gnome_canvas_item_grab_focus (GnomeCanvasItem *item)
+{
+ GnomeCanvasItem *focused_item;
+ GdkEvent ev;
+
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+ g_return_if_fail (GTK_WIDGET_CAN_FOCUS (GTK_WIDGET (item->canvas)));
+
+ focused_item = item->canvas->focused_item;
+
+ if (focused_item) {
+ ev.focus_change.type = GDK_FOCUS_CHANGE;
+ ev.focus_change.window = GTK_LAYOUT (item->canvas)->bin_window;
+ ev.focus_change.send_event = FALSE;
+ ev.focus_change.in = FALSE;
+
+ emit_event (item->canvas, &ev);
+ }
+
+ item->canvas->focused_item = item;
+ gtk_widget_grab_focus (GTK_WIDGET (item->canvas));
+
+ if (focused_item) {
+ ev.focus_change.type = GDK_FOCUS_CHANGE;
+ ev.focus_change.window = GTK_LAYOUT (item->canvas)->bin_window;
+ ev.focus_change.send_event = FALSE;
+ ev.focus_change.in = TRUE;
+
+ emit_event (item->canvas, &ev);
+ }
+}
+
+
+/**
+ * gnome_canvas_item_get_bounds:
+ * @item: A canvas item.
+ * @x1: Leftmost edge of the bounding box (return value).
+ * @y1: Upper edge of the bounding box (return value).
+ * @x2: Rightmost edge of the bounding box (return value).
+ * @y2: Lower edge of the bounding box (return value).
+ *
+ * Queries the bounding box of a canvas item. The bounds are returned in the
+ * coordinate system of the item's parent.
+ **/
+void
+gnome_canvas_item_get_bounds (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2)
+{
+ double tx1, ty1, tx2, ty2;
+ ArtPoint p1, p2, p3, p4;
+ ArtPoint q1, q2, q3, q4;
+ double min_x1, min_y1, min_x2, min_y2;
+ double max_x1, max_y1, max_x2, max_y2;
+
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+
+ tx1 = ty1 = tx2 = ty2 = 0.0;
+
+ /* Get the item's bounds in its coordinate system */
+
+ if (GNOME_CANVAS_ITEM_GET_CLASS (item)->bounds)
+ (* GNOME_CANVAS_ITEM_GET_CLASS (item)->bounds) (item, &tx1, &ty1, &tx2, &ty2);
+
+ /* Make the bounds relative to the item's parent coordinate system */
+
+ if (item->xform && (item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL)) {
+ p1.x = p2.x = tx1;
+ p1.y = p4.y = ty1;
+ p3.x = p4.x = tx2;
+ p2.y = p3.y = ty2;
+
+ art_affine_point (&q1, &p1, item->xform);
+ art_affine_point (&q2, &p2, item->xform);
+ art_affine_point (&q3, &p3, item->xform);
+ art_affine_point (&q4, &p4, item->xform);
+
+ if (q1.x < q2.x) {
+ min_x1 = q1.x;
+ max_x1 = q2.x;
+ } else {
+ min_x1 = q2.x;
+ max_x1 = q1.x;
+ }
+
+ if (q1.y < q2.y) {
+ min_y1 = q1.y;
+ max_y1 = q2.y;
+ } else {
+ min_y1 = q2.y;
+ max_y1 = q1.y;
+ }
+
+ if (q3.x < q4.x) {
+ min_x2 = q3.x;
+ max_x2 = q4.x;
+ } else {
+ min_x2 = q4.x;
+ max_x2 = q3.x;
+ }
+
+ if (q3.y < q4.y) {
+ min_y2 = q3.y;
+ max_y2 = q4.y;
+ } else {
+ min_y2 = q4.y;
+ max_y2 = q3.y;
+ }
+
+ tx1 = MIN (min_x1, min_x2);
+ ty1 = MIN (min_y1, min_y2);
+ tx2 = MAX (max_x1, max_x2);
+ ty2 = MAX (max_y1, max_y2);
+ } else if (item->xform) {
+ tx1 += item->xform[0];
+ ty1 += item->xform[1];
+ tx2 += item->xform[0];
+ ty2 += item->xform[1];
+ }
+
+ /* Return the values */
+
+ if (x1)
+ *x1 = tx1;
+
+ if (y1)
+ *y1 = ty1;
+
+ if (x2)
+ *x2 = tx2;
+
+ if (y2)
+ *y2 = ty2;
+}
+
+
+/**
+ * gnome_canvas_item_request_update
+ * @item: A canvas item.
+ *
+ * To be used only by item implementations. Requests that the canvas queue an
+ * update for the specified item.
+ **/
+void
+gnome_canvas_item_request_update (GnomeCanvasItem *item)
+{
+ if (item->object.flags & GNOME_CANVAS_ITEM_NEED_UPDATE)
+ return;
+
+ item->object.flags |= GNOME_CANVAS_ITEM_NEED_UPDATE;
+
+ if (item->parent != NULL) {
+ /* Recurse up the tree */
+ gnome_canvas_item_request_update (item->parent);
+ } else {
+ /* Have reached the top of the tree, make sure the update call gets scheduled. */
+ gnome_canvas_request_update (item->canvas);
+ }
+}
+
+/*** GnomeCanvasGroup ***/
+
+
+enum {
+ GROUP_PROP_0,
+ GROUP_PROP_X,
+ GROUP_PROP_Y
+};
+
+
+static void gnome_canvas_group_class_init (GnomeCanvasGroupClass *class);
+static void gnome_canvas_group_init (GnomeCanvasGroup *group);
+static void gnome_canvas_group_set_property(GObject *object,
+ guint param_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gnome_canvas_group_get_property(GObject *object,
+ guint param_id,
+ GValue *value,
+ GParamSpec *pspec);
+
+static void gnome_canvas_group_destroy (GtkObject *object);
+
+static void gnome_canvas_group_update (GnomeCanvasItem *item, double *affine,
+ ArtSVP *clip_path, int flags);
+static void gnome_canvas_group_realize (GnomeCanvasItem *item);
+static void gnome_canvas_group_unrealize (GnomeCanvasItem *item);
+static void gnome_canvas_group_map (GnomeCanvasItem *item);
+static void gnome_canvas_group_unmap (GnomeCanvasItem *item);
+static void gnome_canvas_group_draw (GnomeCanvasItem *item, GdkDrawable *drawable,
+ int x, int y, int width, int height);
+static double gnome_canvas_group_point (GnomeCanvasItem *item, double x, double y,
+ int cx, int cy,
+ GnomeCanvasItem **actual_item);
+static void gnome_canvas_group_bounds (GnomeCanvasItem *item, double *x1, double *y1,
+ double *x2, double *y2);
+static void gnome_canvas_group_render (GnomeCanvasItem *item,
+ GnomeCanvasBuf *buf);
+
+
+static GnomeCanvasItemClass *group_parent_class;
+
+
+/**
+ * gnome_canvas_group_get_type:
+ *
+ * Registers the &GnomeCanvasGroup class if necessary, and returns the type ID
+ * associated to it.
+ *
+ * Return value: The type ID of the &GnomeCanvasGroup class.
+ **/
+GType
+gnome_canvas_group_get_type (void)
+{
+ static GType canvas_group_type;
+
+ if (!canvas_group_type) {
+ const GTypeInfo object_info = {
+ sizeof (GnomeCanvasGroupClass),
+ (GBaseInitFunc) NULL,
+ (GBaseFinalizeFunc) NULL,
+ (GClassInitFunc) gnome_canvas_group_class_init,
+ (GClassFinalizeFunc) NULL,
+ NULL, /* class_data */
+ sizeof (GnomeCanvasGroup),
+ 0, /* n_preallocs */
+ (GInstanceInitFunc) gnome_canvas_group_init,
+ NULL /* value_table */
+ };
+
+ canvas_group_type = g_type_register_static (GNOME_TYPE_CANVAS_ITEM, "GnomeCanvasGroup",
+ &object_info, 0);
+ }
+
+ return canvas_group_type;
+}
+
+/* Class initialization function for GnomeCanvasGroupClass */
+static void
+gnome_canvas_group_class_init (GnomeCanvasGroupClass *class)
+{
+ GObjectClass *gobject_class;
+ GtkObjectClass *object_class;
+ GnomeCanvasItemClass *item_class;
+
+ gobject_class = (GObjectClass *) class;
+ object_class = (GtkObjectClass *) class;
+ item_class = (GnomeCanvasItemClass *) class;
+
+ group_parent_class = g_type_class_peek_parent (class);
+
+ gobject_class->set_property = gnome_canvas_group_set_property;
+ gobject_class->get_property = gnome_canvas_group_get_property;
+
+ g_object_class_install_property
+ (gobject_class, GROUP_PROP_X,
+ g_param_spec_double ("x",
+ _("X"),
+ _("X"),
+ -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
+ (G_PARAM_READABLE | G_PARAM_WRITABLE)));
+ g_object_class_install_property
+ (gobject_class, GROUP_PROP_Y,
+ g_param_spec_double ("y",
+ _("Y"),
+ _("Y"),
+ -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
+ (G_PARAM_READABLE | G_PARAM_WRITABLE)));
+
+ object_class->destroy = gnome_canvas_group_destroy;
+
+ item_class->update = gnome_canvas_group_update;
+ item_class->realize = gnome_canvas_group_realize;
+ item_class->unrealize = gnome_canvas_group_unrealize;
+ item_class->map = gnome_canvas_group_map;
+ item_class->unmap = gnome_canvas_group_unmap;
+ item_class->draw = gnome_canvas_group_draw;
+ item_class->render = gnome_canvas_group_render;
+ item_class->point = gnome_canvas_group_point;
+ item_class->bounds = gnome_canvas_group_bounds;
+}
+
+/* Object initialization function for GnomeCanvasGroup */
+static void
+gnome_canvas_group_init (GnomeCanvasGroup *group)
+{
+#if 0
+ group->xpos = 0.0;
+ group->ypos = 0.0;
+#endif
+}
+
+/* Translate handler for canvas groups */
+static double *
+gnome_canvas_ensure_translate (GnomeCanvasItem *item)
+{
+ if (item->xform == NULL) {
+ GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_AFFINE_FULL);
+ item->xform = g_new (double, 2);
+ item->xform[0] = 0.0;
+ item->xform[1] = 0.0;
+ return item->xform;
+ } else if (item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL) {
+ return item->xform + 4;
+ } else {
+ return item->xform;
+ }
+}
+
+/* Set_property handler for canvas groups */
+static void
+gnome_canvas_group_set_property (GObject *gobject, guint param_id,
+ const GValue *value, GParamSpec *pspec)
+{
+ GnomeCanvasItem *item;
+ double *xlat;
+
+ g_return_if_fail (GNOME_IS_CANVAS_GROUP (gobject));
+
+ item = GNOME_CANVAS_ITEM (gobject);
+
+ switch (param_id) {
+ case GROUP_PROP_X:
+ xlat = gnome_canvas_ensure_translate (item);
+ xlat[0] = g_value_get_double (value);
+ break;
+
+ case GROUP_PROP_Y:
+ xlat = gnome_canvas_ensure_translate (item);
+ xlat[1] = g_value_get_double (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec);
+ break;
+ }
+}
+
+/* Get_property handler for canvas groups */
+static void
+gnome_canvas_group_get_property (GObject *gobject, guint param_id,
+ GValue *value, GParamSpec *pspec)
+{
+ GnomeCanvasItem *item;
+
+ g_return_if_fail (GNOME_IS_CANVAS_GROUP (gobject));
+
+ item = GNOME_CANVAS_ITEM (gobject);
+
+ switch (param_id) {
+ case GROUP_PROP_X:
+ if (item->xform == NULL)
+ g_value_set_double (value, 0);
+ else if (GTK_OBJECT (gobject)->flags & GNOME_CANVAS_ITEM_AFFINE_FULL)
+ g_value_set_double (value, item->xform[4]);
+ else
+ g_value_set_double (value, item->xform[0]);
+ break;
+
+ case GROUP_PROP_Y:
+ if (item->xform == NULL)
+ g_value_set_double (value, 0);
+ else if (GTK_OBJECT (gobject)->flags & GNOME_CANVAS_ITEM_AFFINE_FULL)
+ g_value_set_double (value, item->xform[5]);
+ else
+ g_value_set_double (value, item->xform[1]);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec);
+ break;
+ }
+}
+
+/* Destroy handler for canvas groups */
+static void
+gnome_canvas_group_destroy (GtkObject *object)
+{
+ GnomeCanvasGroup *group;
+
+ g_return_if_fail (GNOME_IS_CANVAS_GROUP (object));
+
+ group = GNOME_CANVAS_GROUP (object);
+
+ while (group->item_list) {
+ // child is unref'ed by the child's group_remove().
+ gtk_object_destroy (GTK_OBJECT (group->item_list->data));
+ }
+
+ if (GTK_OBJECT_CLASS (group_parent_class)->destroy)
+ (* GTK_OBJECT_CLASS (group_parent_class)->destroy) (object);
+}
+
+/* Update handler for canvas groups */
+static void
+gnome_canvas_group_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
+{
+ GnomeCanvasGroup *group;
+ GList *list;
+ GnomeCanvasItem *i;
+ ArtDRect bbox, child_bbox;
+
+ group = GNOME_CANVAS_GROUP (item);
+
+ (* group_parent_class->update) (item, affine, clip_path, flags);
+
+ bbox.x0 = 0;
+ bbox.y0 = 0;
+ bbox.x1 = 0;
+ bbox.y1 = 0;
+
+ for (list = group->item_list; list; list = list->next) {
+ i = list->data;
+
+ gnome_canvas_item_invoke_update (i, affine, clip_path, flags);
+
+ child_bbox.x0 = i->x1;
+ child_bbox.y0 = i->y1;
+ child_bbox.x1 = i->x2;
+ child_bbox.y1 = i->y2;
+ art_drect_union (&bbox, &bbox, &child_bbox);
+ }
+ item->x1 = bbox.x0;
+ item->y1 = bbox.y0;
+ item->x2 = bbox.x1;
+ item->y2 = bbox.y1;
+}
+
+/* Realize handler for canvas groups */
+static void
+gnome_canvas_group_realize (GnomeCanvasItem *item)
+{
+ GnomeCanvasGroup *group;
+ GList *list;
+ GnomeCanvasItem *i;
+
+ group = GNOME_CANVAS_GROUP (item);
+
+ for (list = group->item_list; list; list = list->next) {
+ i = list->data;
+
+ if (!(i->object.flags & GNOME_CANVAS_ITEM_REALIZED))
+ (* GNOME_CANVAS_ITEM_GET_CLASS (i)->realize) (i);
+ }
+
+ (* group_parent_class->realize) (item);
+}
+
+/* Unrealize handler for canvas groups */
+static void
+gnome_canvas_group_unrealize (GnomeCanvasItem *item)
+{
+ GnomeCanvasGroup *group;
+ GList *list;
+ GnomeCanvasItem *i;
+
+ group = GNOME_CANVAS_GROUP (item);
+
+ for (list = group->item_list; list; list = list->next) {
+ i = list->data;
+
+ if (i->object.flags & GNOME_CANVAS_ITEM_REALIZED)
+ (* GNOME_CANVAS_ITEM_GET_CLASS (i)->unrealize) (i);
+ }
+
+ (* group_parent_class->unrealize) (item);
+}
+
+/* Map handler for canvas groups */
+static void
+gnome_canvas_group_map (GnomeCanvasItem *item)
+{
+ GnomeCanvasGroup *group;
+ GList *list;
+ GnomeCanvasItem *i;
+
+ group = GNOME_CANVAS_GROUP (item);
+
+ for (list = group->item_list; list; list = list->next) {
+ i = list->data;
+
+ if (!(i->object.flags & GNOME_CANVAS_ITEM_MAPPED))
+ (* GNOME_CANVAS_ITEM_GET_CLASS (i)->map) (i);
+ }
+
+ (* group_parent_class->map) (item);
+}
+
+/* Unmap handler for canvas groups */
+static void
+gnome_canvas_group_unmap (GnomeCanvasItem *item)
+{
+ GnomeCanvasGroup *group;
+ GList *list;
+ GnomeCanvasItem *i;
+
+ group = GNOME_CANVAS_GROUP (item);
+
+ for (list = group->item_list; list; list = list->next) {
+ i = list->data;
+
+ if (i->object.flags & GNOME_CANVAS_ITEM_MAPPED)
+ (* GNOME_CANVAS_ITEM_GET_CLASS (i)->unmap) (i);
+ }
+
+ (* group_parent_class->unmap) (item);
+}
+
+/* Draw handler for canvas groups */
+static void
+gnome_canvas_group_draw (GnomeCanvasItem *item, GdkDrawable *drawable,
+ int x, int y, int width, int height)
+{
+ GnomeCanvasGroup *group;
+ GList *list;
+ GnomeCanvasItem *child = NULL;
+
+ group = GNOME_CANVAS_GROUP (item);
+
+ for (list = group->item_list; list; list = list->next) {
+ child = list->data;
+
+ if (((child->object.flags & GNOME_CANVAS_ITEM_VISIBLE)
+ && ((child->x1 < (x + width))
+ && (child->y1 < (y + height))
+ && (child->x2 > x)
+ && (child->y2 > y)))
+ || ((GTK_OBJECT_FLAGS (child) & GNOME_CANVAS_ITEM_ALWAYS_REDRAW)
+ && (child->x1 < child->canvas->redraw_x2)
+ && (child->y1 < child->canvas->redraw_y2)
+ && (child->x2 > child->canvas->redraw_x1)
+ && (child->y2 > child->canvas->redraw_y2)))
+ if (GNOME_CANVAS_ITEM_GET_CLASS (child)->draw)
+ (* GNOME_CANVAS_ITEM_GET_CLASS (child)->draw) (
+ child, drawable, x, y, width, height);
+ }
+}
+
+/* Point handler for canvas groups */
+static double
+gnome_canvas_group_point (GnomeCanvasItem *item, double x, double y, int cx, int cy,
+ GnomeCanvasItem **actual_item)
+{
+ GnomeCanvasGroup *group;
+ GList *list;
+ GnomeCanvasItem *child, *point_item;
+ int x1, y1, x2, y2;
+ double gx, gy;
+ double dist, best;
+ int has_point;
+
+ group = GNOME_CANVAS_GROUP (item);
+
+ x1 = cx - item->canvas->close_enough;
+ y1 = cy - item->canvas->close_enough;
+ x2 = cx + item->canvas->close_enough;
+ y2 = cy + item->canvas->close_enough;
+
+ best = 0.0;
+ *actual_item = NULL;
+
+ gx = x;
+ gy = y;
+
+ dist = 0.0; /* keep gcc happy */
+
+ for (list = group->item_list; list; list = list->next) {
+ child = list->data;
+
+ if ((child->x1 > x2) || (child->y1 > y2) || (child->x2 < x1) || (child->y2 < y1))
+ continue;
+
+ point_item = NULL; /* cater for incomplete item implementations */
+
+ if ((child->object.flags & GNOME_CANVAS_ITEM_VISIBLE)
+ && GNOME_CANVAS_ITEM_GET_CLASS (child)->point) {
+ dist = gnome_canvas_item_invoke_point (child, gx, gy, cx, cy, &point_item);
+ has_point = TRUE;
+ } else
+ has_point = FALSE;
+
+ if (has_point
+ && point_item
+ && ((int) (dist * item->canvas->pixels_per_unit + 0.5)
+ <= item->canvas->close_enough)) {
+ best = dist;
+ *actual_item = point_item;
+ }
+ }
+
+ return best;
+}
+
+/* Bounds handler for canvas groups */
+static void
+gnome_canvas_group_bounds (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2)
+{
+ GnomeCanvasGroup *group;
+ GnomeCanvasItem *child;
+ GList *list;
+ double tx1, ty1, tx2, ty2;
+ double minx, miny, maxx, maxy;
+ int set;
+
+ group = GNOME_CANVAS_GROUP (item);
+
+ /* Get the bounds of the first visible item */
+
+ child = NULL; /* Unnecessary but eliminates a warning. */
+
+ set = FALSE;
+
+ for (list = group->item_list; list; list = list->next) {
+ child = list->data;
+
+ if (child->object.flags & GNOME_CANVAS_ITEM_VISIBLE) {
+ set = TRUE;
+ gnome_canvas_item_get_bounds (child, &minx, &miny, &maxx, &maxy);
+ break;
+ }
+ }
+
+ /* If there were no visible items, return an empty bounding box */
+
+ if (!set) {
+ *x1 = *y1 = *x2 = *y2 = 0.0;
+ return;
+ }
+
+ /* Now we can grow the bounds using the rest of the items */
+
+ list = list->next;
+
+ for (; list; list = list->next) {
+ child = list->data;
+
+ if (!(child->object.flags & GNOME_CANVAS_ITEM_VISIBLE))
+ continue;
+
+ gnome_canvas_item_get_bounds (child, &tx1, &ty1, &tx2, &ty2);
+
+ if (tx1 < minx)
+ minx = tx1;
+
+ if (ty1 < miny)
+ miny = ty1;
+
+ if (tx2 > maxx)
+ maxx = tx2;
+
+ if (ty2 > maxy)
+ maxy = ty2;
+ }
+
+ *x1 = minx;
+ *y1 = miny;
+ *x2 = maxx;
+ *y2 = maxy;
+}
+
+/* Render handler for canvas groups */
+static void
+gnome_canvas_group_render (GnomeCanvasItem *item, GnomeCanvasBuf *buf)
+{
+ GnomeCanvasGroup *group;
+ GnomeCanvasItem *child;
+ GList *list;
+
+ group = GNOME_CANVAS_GROUP (item);
+
+ for (list = group->item_list; list; list = list->next) {
+ child = list->data;
+
+ if (((child->object.flags & GNOME_CANVAS_ITEM_VISIBLE)
+ && ((child->x1 < buf->rect.x1)
+ && (child->y1 < buf->rect.y1)
+ && (child->x2 > buf->rect.x0)
+ && (child->y2 > buf->rect.y0)))
+ || ((GTK_OBJECT_FLAGS (child) & GNOME_CANVAS_ITEM_ALWAYS_REDRAW)
+ && (child->x1 < child->canvas->redraw_x2)
+ && (child->y1 < child->canvas->redraw_y2)
+ && (child->x2 > child->canvas->redraw_x1)
+ && (child->y2 > child->canvas->redraw_y2)))
+ if (GNOME_CANVAS_ITEM_GET_CLASS (child)->render)
+ (* GNOME_CANVAS_ITEM_GET_CLASS (child)->render) (
+ child, buf);
+ }
+}
+
+/* Adds an item to a group */
+static void
+group_add (GnomeCanvasGroup *group, GnomeCanvasItem *item)
+{
+ g_object_ref_sink (G_OBJECT (item));
+
+ if (!group->item_list) {
+ group->item_list = g_list_append (group->item_list, item);
+ group->item_list_end = group->item_list;
+ } else
+ group->item_list_end = g_list_append (group->item_list_end, item)->next;
+
+ if (group->item.object.flags & GNOME_CANVAS_ITEM_REALIZED)
+ (* GNOME_CANVAS_ITEM_GET_CLASS (item)->realize) (item);
+
+ if (group->item.object.flags & GNOME_CANVAS_ITEM_MAPPED)
+ (* GNOME_CANVAS_ITEM_GET_CLASS (item)->map) (item);
+
+ g_object_notify (G_OBJECT (item), "parent");
+}
+
+/* Removes an item from a group */
+static void
+group_remove (GnomeCanvasGroup *group, GnomeCanvasItem *item)
+{
+ GList *children;
+
+ g_return_if_fail (GNOME_IS_CANVAS_GROUP (group));
+ g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+
+ for (children = group->item_list; children; children = children->next)
+ if (children->data == item) {
+ if (item->object.flags & GNOME_CANVAS_ITEM_MAPPED)
+ (* GNOME_CANVAS_ITEM_GET_CLASS (item)->unmap) (item);
+
+ if (item->object.flags & GNOME_CANVAS_ITEM_REALIZED)
+ (* GNOME_CANVAS_ITEM_GET_CLASS (item)->unrealize) (item);
+
+ /* Unparent the child */
+
+ item->parent = NULL;
+ g_object_unref (G_OBJECT (item));
+
+ /* Remove it from the list */
+
+ if (children == group->item_list_end)
+ group->item_list_end = children->prev;
+
+ group->item_list = g_list_remove_link (group->item_list, children);
+ g_list_free (children);
+ break;
+ }
+}
+
+
+/*** GnomeCanvas ***/
+
+
+enum {
+ DRAW_BACKGROUND,
+ RENDER_BACKGROUND,
+ LAST_SIGNAL
+};
+
+static void gnome_canvas_class_init (GnomeCanvasClass *class);
+static void gnome_canvas_init (GnomeCanvas *canvas);
+static void gnome_canvas_destroy (GtkObject *object);
+static void gnome_canvas_map (GtkWidget *widget);
+static void gnome_canvas_unmap (GtkWidget *widget);
+static void gnome_canvas_realize (GtkWidget *widget);
+static void gnome_canvas_unrealize (GtkWidget *widget);
+static void gnome_canvas_size_allocate (GtkWidget *widget,
+ GtkAllocation *allocation);
+static gint gnome_canvas_button (GtkWidget *widget,
+ GdkEventButton *event);
+static gint gnome_canvas_motion (GtkWidget *widget,
+ GdkEventMotion *event);
+static gint gnome_canvas_expose (GtkWidget *widget,
+ GdkEventExpose *event);
+static gboolean gnome_canvas_key (GtkWidget *widget,
+ GdkEventKey *event);
+static gboolean gnome_canvas_scroll (GtkWidget *widget,
+ GdkEventScroll *event);
+static gint gnome_canvas_crossing (GtkWidget *widget,
+ GdkEventCrossing *event);
+static gint gnome_canvas_focus_in (GtkWidget *widget,
+ GdkEventFocus *event);
+static gint gnome_canvas_focus_out (GtkWidget *widget,
+ GdkEventFocus *event);
+static void gnome_canvas_request_update_real (GnomeCanvas *canvas);
+static void gnome_canvas_draw_background (GnomeCanvas *canvas,
+ GdkDrawable *drawable,
+ int x,
+ int y,
+ int width,
+ int height);
+
+
+static GtkLayoutClass *canvas_parent_class;
+
+static guint canvas_signals[LAST_SIGNAL];
+
+enum {
+ PROP_AA = 1,
+ PROP_FOCUSED_ITEM
+};
+
+/**
+ * gnome_canvas_get_type:
+ *
+ * Registers the &GnomeCanvas class if necessary, and returns the type ID
+ * associated to it.
+ *
+ * Return value: The type ID of the &GnomeCanvas class.
+ **/
+GType
+gnome_canvas_get_type (void)
+{
+ static GType canvas_type;
+
+ if (!canvas_type) {
+ const GTypeInfo object_info = {
+ sizeof (GnomeCanvasClass),
+ (GBaseInitFunc) NULL,
+ (GBaseFinalizeFunc) NULL,
+ (GClassInitFunc) gnome_canvas_class_init,
+ (GClassFinalizeFunc) NULL,
+ NULL, /* class_data */
+ sizeof (GnomeCanvas),
+ 0, /* n_preallocs */
+ (GInstanceInitFunc) gnome_canvas_init,
+ NULL /* value_table */
+ };
+
+ canvas_type = g_type_register_static (GTK_TYPE_LAYOUT, "GnomeCanvas",
+ &object_info, 0);
+ }
+
+ return canvas_type;
+}
+
+static void
+gnome_canvas_get_property (GObject *object,
+ guint prop_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ switch (prop_id) {
+ case PROP_AA:
+ g_value_set_boolean (value, GNOME_CANVAS (object)->aa);
+ break;
+ case PROP_FOCUSED_ITEM:
+ g_value_set_object (value, GNOME_CANVAS (object)->focused_item);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+gnome_canvas_set_property (GObject *object,
+ guint prop_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ switch (prop_id) {
+ case PROP_AA:
+ GNOME_CANVAS (object)->aa = g_value_get_boolean (value);
+ break;
+ case PROP_FOCUSED_ITEM:
+ GNOME_CANVAS (object)->focused_item = g_value_get_object (value);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+/* Class initialization function for GnomeCanvasClass */
+static void
+gnome_canvas_class_init (GnomeCanvasClass *klass)
+{
+ GObjectClass *gobject_class;
+ GtkObjectClass *object_class;
+ GtkWidgetClass *widget_class;
+
+ gobject_class = (GObjectClass *)klass;
+ object_class = (GtkObjectClass *) klass;
+ widget_class = (GtkWidgetClass *) klass;
+
+ canvas_parent_class = g_type_class_peek_parent (klass);
+
+ gobject_class->set_property = gnome_canvas_set_property;
+ gobject_class->get_property = gnome_canvas_get_property;
+
+ object_class->destroy = gnome_canvas_destroy;
+
+ widget_class->map = gnome_canvas_map;
+ widget_class->unmap = gnome_canvas_unmap;
+ widget_class->realize = gnome_canvas_realize;
+ widget_class->unrealize = gnome_canvas_unrealize;
+ widget_class->size_allocate = gnome_canvas_size_allocate;
+ widget_class->button_press_event = gnome_canvas_button;
+ widget_class->button_release_event = gnome_canvas_button;
+ widget_class->motion_notify_event = gnome_canvas_motion;
+ widget_class->expose_event = gnome_canvas_expose;
+ widget_class->key_press_event = gnome_canvas_key;
+ widget_class->key_release_event = gnome_canvas_key;
+ widget_class->enter_notify_event = gnome_canvas_crossing;
+ widget_class->leave_notify_event = gnome_canvas_crossing;
+ widget_class->focus_in_event = gnome_canvas_focus_in;
+ widget_class->focus_out_event = gnome_canvas_focus_out;
+ widget_class->scroll_event = gnome_canvas_scroll;
+
+ klass->draw_background = gnome_canvas_draw_background;
+ klass->render_background = NULL;
+ klass->request_update = gnome_canvas_request_update_real;
+
+ g_object_class_install_property (G_OBJECT_CLASS (object_class),
+ PROP_AA,
+ g_param_spec_boolean ("aa",
+ _("Antialiased"),
+ _("The antialiasing mode of the canvas."),
+ FALSE,
+ G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
+
+ g_object_class_install_property (gobject_class, PROP_FOCUSED_ITEM,
+ g_param_spec_object ("focused_item", NULL, NULL,
+ GNOME_TYPE_CANVAS_ITEM,
+ (G_PARAM_READABLE | G_PARAM_WRITABLE)));
+
+ canvas_signals[DRAW_BACKGROUND] =
+ g_signal_new ("draw_background",
+ G_TYPE_FROM_CLASS (object_class),
+ G_SIGNAL_RUN_LAST,
+ G_STRUCT_OFFSET (GnomeCanvasClass, draw_background),
+ NULL, NULL,
+ gnome_canvas_marshal_VOID__OBJECT_INT_INT_INT_INT,
+ G_TYPE_NONE, 5, GDK_TYPE_DRAWABLE,
+ G_TYPE_INT, G_TYPE_INT, G_TYPE_INT, G_TYPE_INT);
+ canvas_signals[RENDER_BACKGROUND] =
+ g_signal_new ("render_background",
+ G_TYPE_FROM_CLASS (object_class),
+ G_SIGNAL_RUN_LAST,
+ G_STRUCT_OFFSET (GnomeCanvasClass, render_background),
+ NULL, NULL,
+ g_cclosure_marshal_VOID__POINTER,
+ G_TYPE_NONE, 1, G_TYPE_POINTER);
+
+}
+
+/* Callback used when the root item of a canvas is destroyed. The user should
+ * never ever do this, so we panic if this happens.
+ */
+static void
+panic_root_destroyed (GtkObject *object, gpointer data)
+{
+ g_error ("Eeeek, root item %p of canvas %p was destroyed!", object, data);
+}
+
+/* Object initialization function for GnomeCanvas */
+static void
+gnome_canvas_init (GnomeCanvas *canvas)
+{
+ GTK_WIDGET_SET_FLAGS (canvas, GTK_CAN_FOCUS);
+
+ canvas->need_update = FALSE;
+ canvas->need_redraw = FALSE;
+ canvas->redraw_area = NULL;
+ canvas->idle_id = 0;
+
+ canvas->scroll_x1 = 0.0;
+ canvas->scroll_y1 = 0.0;
+ canvas->scroll_x2 = canvas->layout.width;
+ canvas->scroll_y2 = canvas->layout.height;
+
+ canvas->pixels_per_unit = 1.0;
+
+ canvas->pick_event.type = GDK_LEAVE_NOTIFY;
+ canvas->pick_event.crossing.x = 0;
+ canvas->pick_event.crossing.y = 0;
+
+ canvas->dither = GDK_RGB_DITHER_MAX;
+
+ /* This may not be what people want, but it is set to be turned on by
+ * default to have the same initial behavior as the canvas in GNOME 1.4.
+ */
+ canvas->center_scroll_region = TRUE;
+
+ gtk_layout_set_hadjustment (GTK_LAYOUT (canvas), NULL);
+ gtk_layout_set_vadjustment (GTK_LAYOUT (canvas), NULL);
+
+ /* Disable the gtk+ double buffering since the canvas uses it's own. */
+ gtk_widget_set_double_buffered (GTK_WIDGET (canvas), FALSE);
+
+ /* Create the root item as a special case */
+
+ canvas->root = GNOME_CANVAS_ITEM (g_object_new (gnome_canvas_group_get_type (), NULL));
+ canvas->root->canvas = canvas;
+
+ g_object_ref_sink (canvas->root);
+
+ canvas->root_destroy_id = g_signal_connect (canvas->root, "destroy",
+ G_CALLBACK (panic_root_destroyed),
+ canvas);
+
+ canvas->need_repick = TRUE;
+}
+
+/* Convenience function to remove the idle handler of a canvas */
+static void
+remove_idle (GnomeCanvas *canvas)
+{
+ if (canvas->idle_id == 0)
+ return;
+
+ g_source_remove (canvas->idle_id);
+ canvas->idle_id = 0;
+}
+
+/* Removes the transient state of the canvas (idle handler, grabs). */
+static void
+shutdown_transients (GnomeCanvas *canvas)
+{
+ /* We turn off the need_redraw flag, since if the canvas is mapped again
+ * it will request a redraw anyways. We do not turn off the need_update
+ * flag, though, because updates are not queued when the canvas remaps
+ * itself.
+ */
+ if (canvas->need_redraw) {
+ canvas->need_redraw = FALSE;
+ art_uta_free (canvas->redraw_area);
+ canvas->redraw_area = NULL;
+ canvas->redraw_x1 = 0;
+ canvas->redraw_y1 = 0;
+ canvas->redraw_x2 = 0;
+ canvas->redraw_y2 = 0;
+ }
+
+ if (canvas->grabbed_item) {
+ canvas->grabbed_item = NULL;
+ gdk_pointer_ungrab (GDK_CURRENT_TIME);
+ }
+
+ remove_idle (canvas);
+}
+
+/* Destroy handler for GnomeCanvas */
+static void
+gnome_canvas_destroy (GtkObject *object)
+{
+ GnomeCanvas *canvas;
+
+ g_return_if_fail (GNOME_IS_CANVAS (object));
+
+ /* remember, destroy can be run multiple times! */
+
+ canvas = GNOME_CANVAS (object);
+
+ if (canvas->root_destroy_id) {
+ g_signal_handler_disconnect (canvas->root, canvas->root_destroy_id);
+ canvas->root_destroy_id = 0;
+ }
+ if (canvas->root) {
+ gtk_object_destroy (GTK_OBJECT (canvas->root));
+ g_object_unref (G_OBJECT (canvas->root));
+ canvas->root = NULL;
+ }
+
+ shutdown_transients (canvas);
+
+ if (GTK_OBJECT_CLASS (canvas_parent_class)->destroy)
+ (* GTK_OBJECT_CLASS (canvas_parent_class)->destroy) (object);
+}
+
+/**
+ * gnome_canvas_new:
+ *
+ * Creates a new empty canvas in non-antialiased mode.
+ *
+ * Return value: A newly-created canvas.
+ **/
+GtkWidget *
+gnome_canvas_new (void)
+{
+ return GTK_WIDGET (g_object_new (gnome_canvas_get_type (), NULL));
+}
+
+/**
+ * gnome_canvas_new_aa:
+ *
+ * Creates a new empty canvas in antialiased mode.
+ *
+ * Return value: A newly-created antialiased canvas.
+ **/
+GtkWidget *
+gnome_canvas_new_aa (void)
+{
+ return GTK_WIDGET (g_object_new (GNOME_TYPE_CANVAS,
+ "aa", TRUE,
+ NULL));
+}
+
+/* Map handler for the canvas */
+static void
+gnome_canvas_map (GtkWidget *widget)
+{
+ GnomeCanvas *canvas;
+
+ g_return_if_fail (GNOME_IS_CANVAS (widget));
+
+ /* Normal widget mapping stuff */
+
+ if (GTK_WIDGET_CLASS (canvas_parent_class)->map)
+ (* GTK_WIDGET_CLASS (canvas_parent_class)->map) (widget);
+
+ canvas = GNOME_CANVAS (widget);
+
+ if (canvas->need_update)
+ add_idle (canvas);
+
+ /* Map items */
+
+ if (GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->map)
+ (* GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->map) (canvas->root);
+}
+
+/* Unmap handler for the canvas */
+static void
+gnome_canvas_unmap (GtkWidget *widget)
+{
+ GnomeCanvas *canvas;
+
+ g_return_if_fail (GNOME_IS_CANVAS (widget));
+
+ canvas = GNOME_CANVAS (widget);
+
+ shutdown_transients (canvas);
+
+ /* Unmap items */
+
+ if (GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->unmap)
+ (* GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->unmap) (canvas->root);
+
+ /* Normal widget unmapping stuff */
+
+ if (GTK_WIDGET_CLASS (canvas_parent_class)->unmap)
+ (* GTK_WIDGET_CLASS (canvas_parent_class)->unmap) (widget);
+}
+
+/* Realize handler for the canvas */
+static void
+gnome_canvas_realize (GtkWidget *widget)
+{
+ GnomeCanvas *canvas;
+
+ g_return_if_fail (GNOME_IS_CANVAS (widget));
+
+ /* Normal widget realization stuff */
+
+ if (GTK_WIDGET_CLASS (canvas_parent_class)->realize)
+ (* GTK_WIDGET_CLASS (canvas_parent_class)->realize) (widget);
+
+ canvas = GNOME_CANVAS (widget);
+
+ gdk_window_set_events (canvas->layout.bin_window,
+ (gdk_window_get_events (canvas->layout.bin_window)
+ | GDK_EXPOSURE_MASK
+ | GDK_BUTTON_PRESS_MASK
+ | GDK_BUTTON_RELEASE_MASK
+ | GDK_POINTER_MOTION_MASK
+ | GDK_KEY_PRESS_MASK
+ | GDK_KEY_RELEASE_MASK
+ | GDK_ENTER_NOTIFY_MASK
+ | GDK_LEAVE_NOTIFY_MASK
+ | GDK_FOCUS_CHANGE_MASK));
+
+ /* Create our own temporary pixmap gc and realize all the items */
+
+ canvas->pixmap_gc = gdk_gc_new (canvas->layout.bin_window);
+
+ (* GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->realize) (canvas->root);
+}
+
+/* Unrealize handler for the canvas */
+static void
+gnome_canvas_unrealize (GtkWidget *widget)
+{
+ GnomeCanvas *canvas;
+
+ g_return_if_fail (GNOME_IS_CANVAS (widget));
+
+ canvas = GNOME_CANVAS (widget);
+
+ shutdown_transients (canvas);
+
+ /* Unrealize items and parent widget */
+
+ (* GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->unrealize) (canvas->root);
+
+ g_object_unref (canvas->pixmap_gc);
+ canvas->pixmap_gc = NULL;
+
+ if (GTK_WIDGET_CLASS (canvas_parent_class)->unrealize)
+ (* GTK_WIDGET_CLASS (canvas_parent_class)->unrealize) (widget);
+}
+
+/* Handles scrolling of the canvas. Adjusts the scrolling and zooming offset to
+ * keep as much as possible of the canvas scrolling region in view.
+ */
+static void
+scroll_to (GnomeCanvas *canvas, int cx, int cy)
+{
+ int scroll_width, scroll_height;
+ int right_limit, bottom_limit;
+ int old_zoom_xofs, old_zoom_yofs;
+ int changed_x = FALSE, changed_y = FALSE;
+ int canvas_width, canvas_height;
+
+ canvas_width = GTK_WIDGET (canvas)->allocation.width;
+ canvas_height = GTK_WIDGET (canvas)->allocation.height;
+
+ scroll_width = floor ((canvas->scroll_x2 - canvas->scroll_x1) * canvas->pixels_per_unit
+ + 0.5);
+ scroll_height = floor ((canvas->scroll_y2 - canvas->scroll_y1) * canvas->pixels_per_unit
+ + 0.5);
+
+ right_limit = scroll_width - canvas_width;
+ bottom_limit = scroll_height - canvas_height;
+
+ old_zoom_xofs = canvas->zoom_xofs;
+ old_zoom_yofs = canvas->zoom_yofs;
+
+ if (right_limit < 0) {
+ cx = 0;
+
+ if (canvas->center_scroll_region) {
+ canvas->zoom_xofs = (canvas_width - scroll_width) / 2;
+ scroll_width = canvas_width;
+ } else
+ canvas->zoom_xofs = 0;
+ } else if (cx < 0) {
+ cx = 0;
+ canvas->zoom_xofs = 0;
+ } else if (cx > right_limit) {
+ cx = right_limit;
+ canvas->zoom_xofs = 0;
+ } else
+ canvas->zoom_xofs = 0;
+
+ if (bottom_limit < 0) {
+ cy = 0;
+
+ if (canvas->center_scroll_region) {
+ canvas->zoom_yofs = (canvas_height - scroll_height) / 2;
+ scroll_height = canvas_height;
+ } else
+ canvas->zoom_yofs = 0;
+ } else if (cy < 0) {
+ cy = 0;
+ canvas->zoom_yofs = 0;
+ } else if (cy > bottom_limit) {
+ cy = bottom_limit;
+ canvas->zoom_yofs = 0;
+ } else
+ canvas->zoom_yofs = 0;
+
+ if ((canvas->zoom_xofs != old_zoom_xofs) || (canvas->zoom_yofs != old_zoom_yofs)) {
+ /* This can only occur, if either canvas size or widget size changes */
+ /* So I think we can request full redraw here */
+ /* The reason is, that coverage UTA will be invalidated by offset change */
+ /* fixme: Strictly this is not correct - we have to remove our own idle (Lauris) */
+ /* More stuff - we have to mark root as needing fresh affine (Lauris) */
+ if (!(canvas->root->object.flags & GNOME_CANVAS_ITEM_NEED_AFFINE)) {
+ canvas->root->object.flags |= GNOME_CANVAS_ITEM_NEED_AFFINE;
+ gnome_canvas_request_update (canvas);
+ }
+ gtk_widget_queue_draw (GTK_WIDGET (canvas));
+ }
+
+ if (canvas->layout.hadjustment && ((int) canvas->layout.hadjustment->value) != cx) {
+ canvas->layout.hadjustment->value = cx;
+ changed_x = TRUE;
+ }
+
+ if (canvas->layout.vadjustment && ((int) canvas->layout.vadjustment->value) != cy) {
+ canvas->layout.vadjustment->value = cy;
+ changed_y = TRUE;
+ }
+
+ if ((scroll_width != (int) canvas->layout.width)
+ || (scroll_height != (int) canvas->layout.height))
+ gtk_layout_set_size (GTK_LAYOUT (canvas), scroll_width, scroll_height);
+
+ /* Signal GtkLayout that it should do a redraw. */
+
+ if (changed_x)
+ g_signal_emit_by_name (canvas->layout.hadjustment, "value_changed");
+
+ if (changed_y)
+ g_signal_emit_by_name (canvas->layout.vadjustment, "value_changed");
+}
+
+/* Size allocation handler for the canvas */
+static void
+gnome_canvas_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
+{
+ GnomeCanvas *canvas;
+
+ g_return_if_fail (GNOME_IS_CANVAS (widget));
+ g_return_if_fail (allocation != NULL);
+
+ if (GTK_WIDGET_CLASS (canvas_parent_class)->size_allocate)
+ (* GTK_WIDGET_CLASS (canvas_parent_class)->size_allocate) (widget, allocation);
+
+ canvas = GNOME_CANVAS (widget);
+
+ /* Recenter the view, if appropriate */
+
+ canvas->layout.hadjustment->page_size = allocation->width;
+ canvas->layout.hadjustment->page_increment = allocation->width / 2;
+
+ canvas->layout.vadjustment->page_size = allocation->height;
+ canvas->layout.vadjustment->page_increment = allocation->height / 2;
+
+ scroll_to (canvas,
+ canvas->layout.hadjustment->value,
+ canvas->layout.vadjustment->value);
+
+ g_signal_emit_by_name (canvas->layout.hadjustment, "changed");
+ g_signal_emit_by_name (canvas->layout.vadjustment, "changed");
+}
+
+/* Emits an event for an item in the canvas, be it the current item, grabbed
+ * item, or focused item, as appropriate.
+ */
+
+static int
+emit_event (GnomeCanvas *canvas, GdkEvent *event)
+{
+ GdkEvent *ev;
+ gint finished;
+ GnomeCanvasItem *item;
+ GnomeCanvasItem *parent;
+ guint mask;
+
+ /* Perform checks for grabbed items */
+
+ if (canvas->grabbed_item &&
+ !is_descendant (canvas->current_item, canvas->grabbed_item)) {
+ /* I think this warning is annoying and I don't know what it's for
+ * so I'll disable it for now.
+ */
+/* g_warning ("emit_event() returning FALSE!\n");*/
+ return FALSE;
+ }
+
+ if (canvas->grabbed_item) {
+ switch (event->type) {
+ case GDK_ENTER_NOTIFY:
+ mask = GDK_ENTER_NOTIFY_MASK;
+ break;
+
+ case GDK_LEAVE_NOTIFY:
+ mask = GDK_LEAVE_NOTIFY_MASK;
+ break;
+
+ case GDK_MOTION_NOTIFY:
+ mask = GDK_POINTER_MOTION_MASK;
+ break;
+
+ case GDK_BUTTON_PRESS:
+ case GDK_2BUTTON_PRESS:
+ case GDK_3BUTTON_PRESS:
+ mask = GDK_BUTTON_PRESS_MASK;
+ break;
+
+ case GDK_BUTTON_RELEASE:
+ mask = GDK_BUTTON_RELEASE_MASK;
+ break;
+
+ case GDK_KEY_PRESS:
+ mask = GDK_KEY_PRESS_MASK;
+ break;
+
+ case GDK_KEY_RELEASE:
+ mask = GDK_KEY_RELEASE_MASK;
+ break;
+
+ case GDK_SCROLL:
+ mask = GDK_SCROLL_MASK;
+ break;
+
+ default:
+ mask = 0;
+ break;
+ }
+
+ if (!(mask & canvas->grabbed_event_mask))
+ return FALSE;
+ }
+
+ /* Convert to world coordinates -- we have two cases because of diferent
+ * offsets of the fields in the event structures.
+ */
+
+ ev = gdk_event_copy (event);
+
+ switch (ev->type)
+ {
+ case GDK_ENTER_NOTIFY:
+ case GDK_LEAVE_NOTIFY:
+ gnome_canvas_window_to_world (canvas,
+ ev->crossing.x, ev->crossing.y,
+ &ev->crossing.x, &ev->crossing.y);
+ break;
+
+ case GDK_MOTION_NOTIFY:
+ case GDK_BUTTON_PRESS:
+ case GDK_2BUTTON_PRESS:
+ case GDK_3BUTTON_PRESS:
+ case GDK_BUTTON_RELEASE:
+ gnome_canvas_window_to_world (canvas,
+ ev->motion.x, ev->motion.y,
+ &ev->motion.x, &ev->motion.y);
+ break;
+
+ default:
+ break;
+ }
+
+ /* Choose where we send the event */
+
+ item = canvas->current_item;
+
+ if (canvas->focused_item
+ && ((event->type == GDK_KEY_PRESS) ||
+ (event->type == GDK_KEY_RELEASE) ||
+ (event->type == GDK_FOCUS_CHANGE)))
+ item = canvas->focused_item;
+
+ /* The event is propagated up the hierarchy (for if someone connected to
+ * a group instead of a leaf event), and emission is stopped if a
+ * handler returns TRUE, just like for GtkWidget events.
+ */
+
+ finished = FALSE;
+
+ while (item && !finished) {
+ g_object_ref (G_OBJECT (item));
+
+ g_signal_emit (item, item_signals[ITEM_EVENT], 0,
+ ev, &finished);
+
+ parent = item->parent;
+ g_object_unref (G_OBJECT (item));
+
+ item = parent;
+ }
+
+ gdk_event_free (ev);
+
+ return finished;
+}
+
+/* Re-picks the current item in the canvas, based on the event's coordinates.
+ * Also emits enter/leave events for items as appropriate.
+ */
+static int
+pick_current_item (GnomeCanvas *canvas, GdkEvent *event)
+{
+ int button_down;
+ double x, y;
+ int cx, cy;
+ int retval;
+
+ retval = FALSE;
+
+ /* If a button is down, we'll perform enter and leave events on the
+ * current item, but not enter on any other item. This is more or less
+ * like X pointer grabbing for canvas items.
+ */
+ button_down = canvas->state & (GDK_BUTTON1_MASK
+ | GDK_BUTTON2_MASK
+ | GDK_BUTTON3_MASK
+ | GDK_BUTTON4_MASK
+ | GDK_BUTTON5_MASK);
+ if (!button_down)
+ canvas->left_grabbed_item = FALSE;
+
+ /* Save the event in the canvas. This is used to synthesize enter and
+ * leave events in case the current item changes. It is also used to
+ * re-pick the current item if the current one gets deleted. Also,
+ * synthesize an enter event.
+ */
+ if (event != &canvas->pick_event) {
+ if ((event->type == GDK_MOTION_NOTIFY) || (event->type == GDK_BUTTON_RELEASE)) {
+ /* these fields have the same offsets in both types of events */
+
+ canvas->pick_event.crossing.type = GDK_ENTER_NOTIFY;
+ canvas->pick_event.crossing.window = event->motion.window;
+ canvas->pick_event.crossing.send_event = event->motion.send_event;
+ canvas->pick_event.crossing.subwindow = NULL;
+ canvas->pick_event.crossing.x = event->motion.x;
+ canvas->pick_event.crossing.y = event->motion.y;
+ canvas->pick_event.crossing.mode = GDK_CROSSING_NORMAL;
+ canvas->pick_event.crossing.detail = GDK_NOTIFY_NONLINEAR;
+ canvas->pick_event.crossing.focus = FALSE;
+ canvas->pick_event.crossing.state = event->motion.state;
+
+ /* these fields don't have the same offsets in both types of events */
+
+ if (event->type == GDK_MOTION_NOTIFY) {
+ canvas->pick_event.crossing.x_root = event->motion.x_root;
+ canvas->pick_event.crossing.y_root = event->motion.y_root;
+ } else {
+ canvas->pick_event.crossing.x_root = event->button.x_root;
+ canvas->pick_event.crossing.y_root = event->button.y_root;
+ }
+ } else
+ canvas->pick_event = *event;
+ }
+
+ /* Don't do anything else if this is a recursive call */
+
+ if (canvas->in_repick)
+ return retval;
+
+ /* LeaveNotify means that there is no current item, so we don't look for one */
+
+ if (canvas->pick_event.type != GDK_LEAVE_NOTIFY) {
+ /* these fields don't have the same offsets in both types of events */
+
+ if (canvas->pick_event.type == GDK_ENTER_NOTIFY) {
+ x = canvas->pick_event.crossing.x - canvas->zoom_xofs;
+ y = canvas->pick_event.crossing.y - canvas->zoom_yofs;
+ } else {
+ x = canvas->pick_event.motion.x - canvas->zoom_xofs;
+ y = canvas->pick_event.motion.y - canvas->zoom_yofs;
+ }
+
+ /* canvas pixel coords */
+
+ cx = (int) (x + 0.5);
+ cy = (int) (y + 0.5);
+
+ /* world coords */
+
+ x = canvas->scroll_x1 + x / canvas->pixels_per_unit;
+ y = canvas->scroll_y1 + y / canvas->pixels_per_unit;
+
+ /* find the closest item */
+
+ if (canvas->root->object.flags & GNOME_CANVAS_ITEM_VISIBLE)
+ gnome_canvas_item_invoke_point (canvas->root, x, y, cx, cy,
+ &canvas->new_current_item);
+ else
+ canvas->new_current_item = NULL;
+ } else
+ canvas->new_current_item = NULL;
+
+ if ((canvas->new_current_item == canvas->current_item) && !canvas->left_grabbed_item)
+ return retval; /* current item did not change */
+
+ /* Synthesize events for old and new current items */
+
+ if ((canvas->new_current_item != canvas->current_item)
+ && (canvas->current_item != NULL)
+ && !canvas->left_grabbed_item) {
+ GdkEvent new_event;
+
+ new_event = canvas->pick_event;
+ new_event.type = GDK_LEAVE_NOTIFY;
+
+ new_event.crossing.detail = GDK_NOTIFY_ANCESTOR;
+ new_event.crossing.subwindow = NULL;
+ canvas->in_repick = TRUE;
+ retval = emit_event (canvas, &new_event);
+ canvas->in_repick = FALSE;
+ }
+
+ /* new_current_item may have been set to NULL during the call to emit_event() above */
+
+ if ((canvas->new_current_item != canvas->current_item) && button_down) {
+ canvas->left_grabbed_item = TRUE;
+ return retval;
+ }
+
+ /* Handle the rest of cases */
+
+ canvas->left_grabbed_item = FALSE;
+ canvas->current_item = canvas->new_current_item;
+
+ if (canvas->current_item != NULL) {
+ GdkEvent new_event;
+
+ new_event = canvas->pick_event;
+ new_event.type = GDK_ENTER_NOTIFY;
+ new_event.crossing.detail = GDK_NOTIFY_ANCESTOR;
+ new_event.crossing.subwindow = NULL;
+ retval = emit_event (canvas, &new_event);
+ }
+
+ return retval;
+}
+
+/* Button event handler for the canvas */
+static gint
+gnome_canvas_button (GtkWidget *widget, GdkEventButton *event)
+{
+ GnomeCanvas *canvas;
+ int mask;
+ int retval;
+
+ g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE);
+ g_return_val_if_fail (event != NULL, FALSE);
+
+ retval = FALSE;
+
+ canvas = GNOME_CANVAS (widget);
+
+ /*
+ * dispatch normally regardless of the event's window if an item has
+ * has a pointer grab in effect
+ */
+ if (!canvas->grabbed_item && event->window != canvas->layout.bin_window)
+ return retval;
+
+ switch (event->button) {
+ case 1:
+ mask = GDK_BUTTON1_MASK;
+ break;
+ case 2:
+ mask = GDK_BUTTON2_MASK;
+ break;
+ case 3:
+ mask = GDK_BUTTON3_MASK;
+ break;
+ case 4:
+ mask = GDK_BUTTON4_MASK;
+ break;
+ case 5:
+ mask = GDK_BUTTON5_MASK;
+ break;
+ default:
+ mask = 0;
+ }
+
+ switch (event->type) {
+ case GDK_BUTTON_PRESS:
+ case GDK_2BUTTON_PRESS:
+ case GDK_3BUTTON_PRESS:
+ /* Pick the current item as if the button were not pressed, and
+ * then process the event.
+ */
+ canvas->state = event->state;
+ pick_current_item (canvas, (GdkEvent *) event);
+ canvas->state ^= mask;
+ retval = emit_event (canvas, (GdkEvent *) event);
+ break;
+
+ case GDK_BUTTON_RELEASE:
+ /* Process the event as if the button were pressed, then repick
+ * after the button has been released
+ */
+ canvas->state = event->state;
+ retval = emit_event (canvas, (GdkEvent *) event);
+ event->state ^= mask;
+ canvas->state = event->state;
+ pick_current_item (canvas, (GdkEvent *) event);
+ event->state ^= mask;
+ break;
+
+ default:
+ g_assert_not_reached ();
+ }
+
+ return retval;
+}
+
+/* Motion event handler for the canvas */
+static gint
+gnome_canvas_motion (GtkWidget *widget, GdkEventMotion *event)
+{
+ GnomeCanvas *canvas;
+
+ g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE);
+ g_return_val_if_fail (event != NULL, FALSE);
+
+ canvas = GNOME_CANVAS (widget);
+
+ if (event->window != canvas->layout.bin_window)
+ return FALSE;
+
+ canvas->state = event->state;
+ pick_current_item (canvas, (GdkEvent *) event);
+ return emit_event (canvas, (GdkEvent *) event);
+}
+
+static gboolean
+gnome_canvas_scroll (GtkWidget *widget, GdkEventScroll *event)
+{
+ GnomeCanvas *canvas;
+
+ g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE);
+ g_return_val_if_fail (event != NULL, FALSE);
+
+ canvas = GNOME_CANVAS (widget);
+
+ if (event->window != canvas->layout.bin_window)
+ return FALSE;
+
+ canvas->state = event->state;
+ pick_current_item (canvas, (GdkEvent *) event);
+ return emit_event (canvas, (GdkEvent *) event);
+}
+
+/* Key event handler for the canvas */
+static gboolean
+gnome_canvas_key (GtkWidget *widget, GdkEventKey *event)
+{
+ GnomeCanvas *canvas;
+
+ g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE);
+ g_return_val_if_fail (event != NULL, FALSE);
+
+ canvas = GNOME_CANVAS (widget);
+
+ if (!emit_event (canvas, (GdkEvent *) event)) {
+ GtkWidgetClass *widget_class;
+
+ widget_class = GTK_WIDGET_CLASS (canvas_parent_class);
+
+ if (event->type == GDK_KEY_PRESS) {
+ if (widget_class->key_press_event)
+ return (* widget_class->key_press_event) (widget, event);
+ } else if (event->type == GDK_KEY_RELEASE) {
+ if (widget_class->key_release_event)
+ return (* widget_class->key_release_event) (widget, event);
+ } else
+ g_assert_not_reached ();
+
+ return FALSE;
+ } else
+ return TRUE;
+}
+
+
+/* Crossing event handler for the canvas */
+static gint
+gnome_canvas_crossing (GtkWidget *widget, GdkEventCrossing *event)
+{
+ GnomeCanvas *canvas;
+
+ g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE);
+ g_return_val_if_fail (event != NULL, FALSE);
+
+ canvas = GNOME_CANVAS (widget);
+
+ if (event->window != canvas->layout.bin_window)
+ return FALSE;
+
+ canvas->state = event->state;
+ return pick_current_item (canvas, (GdkEvent *) event);
+}
+
+/* Focus in handler for the canvas */
+static gint
+gnome_canvas_focus_in (GtkWidget *widget, GdkEventFocus *event)
+{
+ GnomeCanvas *canvas;
+
+ GTK_WIDGET_SET_FLAGS (widget, GTK_HAS_FOCUS);
+
+ canvas = GNOME_CANVAS (widget);
+
+ if (canvas->focused_item)
+ return emit_event (canvas, (GdkEvent *) event);
+ else
+ return FALSE;
+}
+
+/* Focus out handler for the canvas */
+static gint
+gnome_canvas_focus_out (GtkWidget *widget, GdkEventFocus *event)
+{
+ GnomeCanvas *canvas;
+
+ GTK_WIDGET_UNSET_FLAGS (widget, GTK_HAS_FOCUS);
+
+ canvas = GNOME_CANVAS (widget);
+
+ if (canvas->focused_item)
+ return emit_event (canvas, (GdkEvent *) event);
+ else
+ return FALSE;
+}
+
+#define REDRAW_QUANTUM_SIZE 512
+
+static void
+gnome_canvas_paint_rect (GnomeCanvas *canvas, gint x0, gint y0, gint x1, gint y1)
+{
+ GtkWidget *widget;
+ gint draw_x1, draw_y1;
+ gint draw_x2, draw_y2;
+ gint draw_width, draw_height;
+
+ g_return_if_fail (!canvas->need_update);
+
+ widget = GTK_WIDGET (canvas);
+
+ draw_x1 = MAX (x0, canvas->layout.hadjustment->value - canvas->zoom_xofs);
+ draw_y1 = MAX (y0, canvas->layout.vadjustment->value - canvas->zoom_yofs);
+ draw_x2 = MIN (draw_x1 + GTK_WIDGET (canvas)->allocation.width, x1);
+ draw_y2 = MIN (draw_y1 + GTK_WIDGET (canvas)->allocation.height, y1);
+
+ draw_width = draw_x2 - draw_x1;
+ draw_height = draw_y2 - draw_y1;
+
+ if (draw_width < 1 || draw_height < 1)
+ return;
+
+ canvas->redraw_x1 = draw_x1;
+ canvas->redraw_y1 = draw_y1;
+ canvas->redraw_x2 = draw_x2;
+ canvas->redraw_y2 = draw_y2;
+ canvas->draw_xofs = draw_x1;
+ canvas->draw_yofs = draw_y1;
+
+ if (canvas->aa) {
+ GnomeCanvasBuf buf;
+ guchar *px;
+ GdkColor *color;
+
+ px = g_new (guchar, draw_width * 3 * draw_height);
+
+ buf.buf = px;
+ buf.buf_rowstride = draw_width * 3;
+ buf.rect.x0 = draw_x1;
+ buf.rect.y0 = draw_y1;
+ buf.rect.x1 = draw_x2;
+ buf.rect.y1 = draw_y2;
+ color = &widget->style->bg[GTK_STATE_NORMAL];
+ buf.bg_color = (((color->red & 0xff00) << 8) | (color->green & 0xff00) | (color->blue >> 8));
+ buf.is_bg = 1;
+ buf.is_buf = 0;
+
+ g_signal_emit (G_OBJECT (canvas), canvas_signals[RENDER_BACKGROUND], 0, &buf);
+
+ if (canvas->root->object.flags & GNOME_CANVAS_ITEM_VISIBLE)
+ (* GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->render) (canvas->root, &buf);
+
+ if (buf.is_bg) {
+ gdk_gc_set_rgb_fg_color (canvas->pixmap_gc, color);
+ gdk_draw_rectangle (canvas->layout.bin_window,
+ canvas->pixmap_gc,
+ TRUE,
+ (draw_x1 + canvas->zoom_xofs),
+ (draw_y1 + canvas->zoom_yofs),
+ draw_width, draw_height);
+ } else {
+ gdk_draw_rgb_image_dithalign (canvas->layout.bin_window,
+ canvas->pixmap_gc,
+ (draw_x1 + canvas->zoom_xofs),
+ (draw_y1 + canvas->zoom_yofs),
+ draw_width, draw_height,
+ canvas->dither,
+ buf.buf,
+ buf.buf_rowstride,
+ draw_x1, draw_y1);
+ }
+
+ g_free (px);
+ } else {
+ GdkPixmap *pixmap;
+
+ pixmap = gdk_pixmap_new (canvas->layout.bin_window,
+ draw_width, draw_height,
+ gtk_widget_get_visual (widget)->depth);
+
+ g_signal_emit (G_OBJECT (canvas), canvas_signals[DRAW_BACKGROUND], 0, pixmap,
+ draw_x1, draw_y1, draw_width, draw_height);
+
+ if (canvas->root->object.flags & GNOME_CANVAS_ITEM_VISIBLE)
+ (* GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->draw) (
+ canvas->root, pixmap,
+ draw_x1, draw_y1,
+ draw_width, draw_height);
+
+ /* Copy the pixmap to the window and clean up */
+
+ gdk_draw_drawable (canvas->layout.bin_window,
+ canvas->pixmap_gc,
+ pixmap,
+ 0, 0,
+ draw_x1 + canvas->zoom_xofs,
+ draw_y1 + canvas->zoom_yofs,
+ draw_width, draw_height);
+
+ g_object_unref (pixmap);
+ }
+}
+
+/* Expose handler for the canvas */
+static gint
+gnome_canvas_expose (GtkWidget *widget, GdkEventExpose *event)
+{
+ GnomeCanvas *canvas;
+ GdkRectangle *rects;
+ gint n_rects;
+ int i;
+
+ canvas = GNOME_CANVAS (widget);
+
+ if (!GTK_WIDGET_DRAWABLE (widget) || (event->window != canvas->layout.bin_window))
+ return FALSE;
+
+#ifdef VERBOSE
+ g_print ("Expose\n");
+#endif
+
+ gdk_region_get_rectangles (event->region, &rects, &n_rects);
+
+ for (i = 0; i < n_rects; i++) {
+ ArtIRect rect;
+
+ rect.x0 = rects[i].x - canvas->zoom_xofs;
+ rect.y0 = rects[i].y - canvas->zoom_yofs;
+ rect.x1 = rects[i].x + rects[i].width - canvas->zoom_xofs;
+ rect.y1 = rects[i].y + rects[i].height - canvas->zoom_yofs;
+
+ if (canvas->need_update || canvas->need_redraw) {
+ ArtUta *uta;
+
+ /* Update or drawing is scheduled, so just mark exposed area as dirty */
+ uta = art_uta_from_irect (&rect);
+ gnome_canvas_request_redraw_uta (canvas, uta);
+ } else {
+ /* No pending updates, draw exposed area immediately */
+ gnome_canvas_paint_rect (canvas, rect.x0, rect.y0, rect.x1, rect.y1);
+
+ /* And call expose on parent container class */
+ if (GTK_WIDGET_CLASS (canvas_parent_class)->expose_event)
+ (* GTK_WIDGET_CLASS (canvas_parent_class)->expose_event) (
+ widget, event);
+ }
+ }
+
+ g_free (rects);
+
+ return FALSE;
+}
+
+/* Repaints the areas in the canvas that need it */
+static void
+paint (GnomeCanvas *canvas)
+{
+ ArtIRect *rects;
+ gint n_rects, i;
+ ArtIRect visible_rect;
+ GdkRegion *region;
+
+ /* Extract big rectangles from the microtile array */
+
+ rects = art_rect_list_from_uta (canvas->redraw_area,
+ REDRAW_QUANTUM_SIZE, REDRAW_QUANTUM_SIZE,
+ &n_rects);
+
+ art_uta_free (canvas->redraw_area);
+ canvas->redraw_area = NULL;
+ canvas->need_redraw = FALSE;
+
+ /* Turn those rectangles into a GdkRegion for exposing */
+
+ visible_rect.x0 = canvas->layout.hadjustment->value - canvas->zoom_xofs;
+ visible_rect.y0 = canvas->layout.vadjustment->value - canvas->zoom_yofs;
+ visible_rect.x1 = visible_rect.x0 + GTK_WIDGET (canvas)->allocation.width;
+ visible_rect.y1 = visible_rect.y0 + GTK_WIDGET (canvas)->allocation.height;
+
+ region = gdk_region_new ();
+
+ for (i = 0; i < n_rects; i++) {
+ ArtIRect clipped;
+
+ art_irect_intersect (&clipped, &visible_rect, rects + i);
+ if (!art_irect_empty (&clipped)) {
+ GdkRectangle gdkrect;
+
+ gdkrect.x = clipped.x0 + canvas->zoom_xofs;
+ gdkrect.y = clipped.y0 + canvas->zoom_yofs;
+ gdkrect.width = clipped.x1 - clipped.x0;
+ gdkrect.height = clipped.y1 - clipped.y0;
+
+ region = gdk_region_rectangle (&gdkrect);
+ gdk_window_invalidate_region (canvas->layout.bin_window, region, FALSE);
+ gdk_region_destroy (region);
+ }
+ }
+
+ art_free (rects);
+
+ canvas->redraw_x1 = 0;
+ canvas->redraw_y1 = 0;
+ canvas->redraw_x2 = 0;
+ canvas->redraw_y2 = 0;
+}
+
+static void
+gnome_canvas_draw_background (GnomeCanvas *canvas, GdkDrawable *drawable,
+ int x, int y, int width, int height)
+{
+ /* By default, we use the style background. */
+ gdk_gc_set_foreground (canvas->pixmap_gc,
+ >K_WIDGET (canvas)->style->bg[GTK_STATE_NORMAL]);
+ gdk_draw_rectangle (drawable,
+ canvas->pixmap_gc,
+ TRUE,
+ 0, 0,
+ width, height);
+}
+
+static void
+do_update (GnomeCanvas *canvas)
+{
+ /* Cause the update if necessary */
+
+update_again:
+ if (canvas->need_update) {
+ gdouble w2cpx[6];
+
+ /* We start updating root with w2cpx affine */
+ w2cpx[0] = canvas->pixels_per_unit;
+ w2cpx[1] = 0.0;
+ w2cpx[2] = 0.0;
+ w2cpx[3] = canvas->pixels_per_unit;
+ w2cpx[4] = -canvas->scroll_x1 * canvas->pixels_per_unit;
+ w2cpx[5] = -canvas->scroll_y1 * canvas->pixels_per_unit;
+
+ gnome_canvas_item_invoke_update (canvas->root, w2cpx, NULL, 0);
+
+ canvas->need_update = FALSE;
+ }
+
+ /* Pick new current item */
+
+ while (canvas->need_repick) {
+ canvas->need_repick = FALSE;
+ pick_current_item (canvas, &canvas->pick_event);
+ }
+
+ /* it is possible that during picking we emitted an event in which
+ the user then called some function which then requested update
+ of something. Without this we'd be left in a state where
+ need_update would have been left TRUE and the canvas would have
+ been left unpainted. */
+ if (canvas->need_update) {
+ goto update_again;
+ }
+
+ /* Paint if able to */
+
+ if (GTK_WIDGET_DRAWABLE (canvas) && canvas->need_redraw)
+ paint (canvas);
+}
+
+/* Idle handler for the canvas. It deals with pending updates and redraws. */
+static gboolean
+idle_handler (gpointer data)
+{
+ GnomeCanvas *canvas;
+
+ GDK_THREADS_ENTER ();
+
+ canvas = GNOME_CANVAS (data);
+
+ do_update (canvas);
+
+ /* Reset idle id */
+ canvas->idle_id = 0;
+
+ GDK_THREADS_LEAVE ();
+
+ return FALSE;
+}
+
+/* Convenience function to add an idle handler to a canvas */
+static void
+add_idle (GnomeCanvas *canvas)
+{
+ g_assert (canvas->need_update || canvas->need_redraw);
+
+ if (!canvas->idle_id)
+ canvas->idle_id = g_idle_add_full (CANVAS_IDLE_PRIORITY,
+ idle_handler,
+ canvas,
+ NULL);
+
+/* canvas->idle_id = gtk_idle_add (idle_handler, canvas); */
+}
+
+/**
+ * gnome_canvas_root:
+ * @canvas: A canvas.
+ *
+ * Queries the root group of a canvas.
+ *
+ * Return value: The root group of the specified canvas.
+ **/
+GnomeCanvasGroup *
+gnome_canvas_root (GnomeCanvas *canvas)
+{
+ g_return_val_if_fail (GNOME_IS_CANVAS (canvas), NULL);
+
+ return GNOME_CANVAS_GROUP (canvas->root);
+}
+
+
+/**
+ * gnome_canvas_set_scroll_region:
+ * @canvas: A canvas.
+ * @x1: Leftmost limit of the scrolling region.
+ * @y1: Upper limit of the scrolling region.
+ * @x2: Rightmost limit of the scrolling region.
+ * @y2: Lower limit of the scrolling region.
+ *
+ * Sets the scrolling region of a canvas to the specified rectangle. The canvas
+ * will then be able to scroll only within this region. The view of the canvas
+ * is adjusted as appropriate to display as much of the new region as possible.
+ **/
+void
+gnome_canvas_set_scroll_region (GnomeCanvas *canvas, double x1, double y1, double x2, double y2)
+{
+ double wxofs, wyofs;
+ int xofs, yofs;
+
+ g_return_if_fail (GNOME_IS_CANVAS (canvas));
+
+ /*
+ * Set the new scrolling region. If possible, do not move the visible contents of the
+ * canvas.
+ */
+
+ gnome_canvas_c2w (canvas,
+ GTK_LAYOUT (canvas)->hadjustment->value + canvas->zoom_xofs,
+ GTK_LAYOUT (canvas)->vadjustment->value + canvas->zoom_yofs,
+ /*canvas->zoom_xofs,
+ canvas->zoom_yofs,*/
+ &wxofs, &wyofs);
+
+ canvas->scroll_x1 = x1;
+ canvas->scroll_y1 = y1;
+ canvas->scroll_x2 = x2;
+ canvas->scroll_y2 = y2;
+
+ gnome_canvas_w2c (canvas, wxofs, wyofs, &xofs, &yofs);
+
+ scroll_to (canvas, xofs, yofs);
+
+ canvas->need_repick = TRUE;
+#if 0
+ /* todo: should be requesting update */
+ (* GNOME_CANVAS_ITEM_CLASS (canvas->root->object.klass)->update) (
+ canvas->root, NULL, NULL, 0);
+#endif
+}
+
+
+/**
+ * gnome_canvas_get_scroll_region:
+ * @canvas: A canvas.
+ * @x1: Leftmost limit of the scrolling region (return value).
+ * @y1: Upper limit of the scrolling region (return value).
+ * @x2: Rightmost limit of the scrolling region (return value).
+ * @y2: Lower limit of the scrolling region (return value).
+ *
+ * Queries the scrolling region of a canvas.
+ **/
+void
+gnome_canvas_get_scroll_region (GnomeCanvas *canvas, double *x1, double *y1, double *x2, double *y2)
+{
+ g_return_if_fail (GNOME_IS_CANVAS (canvas));
+
+ if (x1)
+ *x1 = canvas->scroll_x1;
+
+ if (y1)
+ *y1 = canvas->scroll_y1;
+
+ if (x2)
+ *x2 = canvas->scroll_x2;
+
+ if (y2)
+ *y2 = canvas->scroll_y2;
+}
+
+/**
+ * gnome_canvas_set_center_scroll_region:
+ * @canvas: A canvas.
+ * @center_scroll_region: Whether to center the scrolling region in the canvas
+ * window when it is smaller than the canvas' allocation.
+ *
+ * When the scrolling region of the canvas is smaller than the canvas window,
+ * e.g. the allocation of the canvas, it can be either centered on the window
+ * or simply made to be on the upper-left corner on the window. This function
+ * lets you configure this property.
+ **/
+void
+gnome_canvas_set_center_scroll_region (GnomeCanvas *canvas, gboolean center_scroll_region)
+{
+ g_return_if_fail (GNOME_IS_CANVAS (canvas));
+
+ canvas->center_scroll_region = center_scroll_region != 0;
+
+ scroll_to (canvas,
+ canvas->layout.hadjustment->value,
+ canvas->layout.vadjustment->value);
+}
+
+/**
+ * gnome_canvas_get_center_scroll_region:
+ * @canvas: A canvas.
+ *
+ * Returns whether the canvas is set to center the scrolling region in the window
+ * if the former is smaller than the canvas' allocation.
+ *
+ * Return value: Whether the scroll region is being centered in the canvas window.
+ **/
+gboolean
+gnome_canvas_get_center_scroll_region (GnomeCanvas *canvas)
+{
+ g_return_val_if_fail (GNOME_IS_CANVAS (canvas), FALSE);
+
+ return canvas->center_scroll_region ? TRUE : FALSE;
+}
+
+/**
+ * gnome_canvas_set_pixels_per_unit:
+ * @canvas: A canvas.
+ * @n: The number of pixels that correspond to one canvas unit.
+ *
+ * Sets the zooming factor of a canvas by specifying the number of pixels that
+ * correspond to one canvas unit.
+ *
+ * The anchor point for zooming, i.e. the point that stays fixed and all others
+ * zoom inwards or outwards from it, depends on whether the canvas is set to
+ * center the scrolling region or not. You can control this using the
+ * gnome_canvas_set_center_scroll_region() function. If the canvas is set to
+ * center the scroll region, then the center of the canvas window is used as the
+ * anchor point for zooming. Otherwise, the upper-left corner of the canvas
+ * window is used as the anchor point.
+ **/
+void
+gnome_canvas_set_pixels_per_unit (GnomeCanvas *canvas, double n)
+{
+ double ax, ay;
+ int x1, y1;
+ int anchor_x, anchor_y;
+
+ g_return_if_fail (GNOME_IS_CANVAS (canvas));
+ g_return_if_fail (n > GNOME_CANVAS_EPSILON);
+
+ if (canvas->center_scroll_region) {
+ anchor_x = GTK_WIDGET (canvas)->allocation.width / 2;
+ anchor_y = GTK_WIDGET (canvas)->allocation.height / 2;
+ } else
+ anchor_x = anchor_y = 0;
+
+ /* Find the coordinates of the anchor point in units. */
+ if(canvas->layout.hadjustment) {
+ ax = (canvas->layout.hadjustment->value + anchor_x) / canvas->pixels_per_unit + canvas->scroll_x1 + canvas->zoom_xofs;
+ } else {
+ ax = (0.0 + anchor_x) / canvas->pixels_per_unit + canvas->scroll_x1 + canvas->zoom_xofs;
+ }
+ if(canvas->layout.hadjustment) {
+ ay = (canvas->layout.vadjustment->value + anchor_y) / canvas->pixels_per_unit + canvas->scroll_y1 + canvas->zoom_yofs;
+ } else {
+ ay = (0.0 + anchor_y) / canvas->pixels_per_unit + canvas->scroll_y1 + canvas->zoom_yofs;
+ }
+
+ /* Now calculate the new offset of the upper left corner. */
+ x1 = ((ax - canvas->scroll_x1) * n) - anchor_x;
+ y1 = ((ay - canvas->scroll_y1) * n) - anchor_y;
+
+ canvas->pixels_per_unit = n;
+
+ scroll_to (canvas, x1, y1);
+
+ if (!(canvas->root->object.flags & GNOME_CANVAS_ITEM_NEED_AFFINE)) {
+ canvas->root->object.flags |= GNOME_CANVAS_ITEM_NEED_AFFINE;
+ gnome_canvas_request_update (canvas);
+ }
+
+ canvas->need_repick = TRUE;
+}
+
+/**
+ * gnome_canvas_scroll_to:
+ * @canvas: A canvas.
+ * @cx: Horizontal scrolling offset in canvas pixel units.
+ * @cy: Vertical scrolling offset in canvas pixel units.
+ *
+ * Makes a canvas scroll to the specified offsets, given in canvas pixel units.
+ * The canvas will adjust the view so that it is not outside the scrolling
+ * region. This function is typically not used, as it is better to hook
+ * scrollbars to the canvas layout's scrolling adjusments.
+ **/
+void
+gnome_canvas_scroll_to (GnomeCanvas *canvas, int cx, int cy)
+{
+ g_return_if_fail (GNOME_IS_CANVAS (canvas));
+
+ scroll_to (canvas, cx, cy);
+}
+
+/**
+ * gnome_canvas_get_scroll_offsets:
+ * @canvas: A canvas.
+ * @cx: Horizontal scrolling offset (return value).
+ * @cy: Vertical scrolling offset (return value).
+ *
+ * Queries the scrolling offsets of a canvas. The values are returned in canvas
+ * pixel units.
+ **/
+void
+gnome_canvas_get_scroll_offsets (GnomeCanvas *canvas, int *cx, int *cy)
+{
+ g_return_if_fail (GNOME_IS_CANVAS (canvas));
+
+ if (cx)
+ *cx = canvas->layout.hadjustment->value;
+
+ if (cy)
+ *cy = canvas->layout.vadjustment->value;
+}
+
+/**
+ * gnome_canvas_update_now:
+ * @canvas: A canvas.
+ *
+ * Forces an immediate update and redraw of a canvas. If the canvas does not
+ * have any pending update or redraw requests, then no action is taken. This is
+ * typically only used by applications that need explicit control of when the
+ * display is updated, like games. It is not needed by normal applications.
+ */
+void
+gnome_canvas_update_now (GnomeCanvas *canvas)
+{
+ g_return_if_fail (GNOME_IS_CANVAS (canvas));
+
+ if (!(canvas->need_update || canvas->need_redraw)) {
+ g_assert (canvas->idle_id == 0);
+ g_assert (canvas->redraw_area == NULL);
+ return;
+ }
+
+ remove_idle (canvas);
+ do_update (canvas);
+}
+
+/**
+ * gnome_canvas_get_item_at:
+ * @canvas: A canvas.
+ * @x: X position in world coordinates.
+ * @y: Y position in world coordinates.
+ *
+ * Looks for the item that is under the specified position, which must be
+ * specified in world coordinates.
+ *
+ * Return value: The sought item, or NULL if no item is at the specified
+ * coordinates.
+ **/
+GnomeCanvasItem *
+gnome_canvas_get_item_at (GnomeCanvas *canvas, double x, double y)
+{
+ GnomeCanvasItem *item;
+ double dist;
+ int cx, cy;
+
+ g_return_val_if_fail (GNOME_IS_CANVAS (canvas), NULL);
+
+ gnome_canvas_w2c (canvas, x, y, &cx, &cy);
+
+ dist = gnome_canvas_item_invoke_point (canvas->root, x, y, cx, cy, &item);
+ if ((int) (dist * canvas->pixels_per_unit + 0.5) <= canvas->close_enough)
+ return item;
+ else
+ return NULL;
+}
+
+/* Queues an update of the canvas */
+static void
+gnome_canvas_request_update (GnomeCanvas *canvas)
+{
+ GNOME_CANVAS_GET_CLASS (canvas)->request_update (canvas);
+}
+
+static void
+gnome_canvas_request_update_real (GnomeCanvas *canvas)
+{
+ if (canvas->need_update)
+ return;
+
+ canvas->need_update = TRUE;
+ if (GTK_WIDGET_MAPPED ((GtkWidget *) canvas))
+ add_idle (canvas);
+}
+
+/* Computes the union of two microtile arrays while clipping the result to the
+ * specified rectangle. Any of the specified utas can be NULL, in which case it
+ * is taken to be an empty region.
+ */
+static ArtUta *
+uta_union_clip (ArtUta *uta1, ArtUta *uta2, ArtIRect *clip)
+{
+ ArtUta *uta;
+ ArtUtaBbox *utiles;
+ int clip_x1, clip_y1, clip_x2, clip_y2;
+ int union_x1, union_y1, union_x2, union_y2;
+ int new_x1, new_y1, new_x2, new_y2;
+ int x, y;
+ int ofs, ofs1, ofs2;
+
+ g_assert (clip != NULL);
+
+ /* Compute the tile indices for the clipping rectangle */
+
+ clip_x1 = clip->x0 >> ART_UTILE_SHIFT;
+ clip_y1 = clip->y0 >> ART_UTILE_SHIFT;
+ clip_x2 = (clip->x1 >> ART_UTILE_SHIFT) + 1;
+ clip_y2 = (clip->y1 >> ART_UTILE_SHIFT) + 1;
+
+ /* Get the union of the bounds of both utas */
+
+ if (!uta1) {
+ if (!uta2)
+ return art_uta_new (clip_x1, clip_y1, clip_x1 + 1, clip_y1 + 1);
+
+ union_x1 = uta2->x0;
+ union_y1 = uta2->y0;
+ union_x2 = uta2->x0 + uta2->width;
+ union_y2 = uta2->y0 + uta2->height;
+ } else {
+ if (!uta2) {
+ union_x1 = uta1->x0;
+ union_y1 = uta1->y0;
+ union_x2 = uta1->x0 + uta1->width;
+ union_y2 = uta1->y0 + uta1->height;
+ } else {
+ union_x1 = MIN (uta1->x0, uta2->x0);
+ union_y1 = MIN (uta1->y0, uta2->y0);
+ union_x2 = MAX (uta1->x0 + uta1->width, uta2->x0 + uta2->width);
+ union_y2 = MAX (uta1->y0 + uta1->height, uta2->y0 + uta2->height);
+ }
+ }
+
+ /* Clip the union of the bounds */
+
+ new_x1 = MAX (clip_x1, union_x1);
+ new_y1 = MAX (clip_y1, union_y1);
+ new_x2 = MIN (clip_x2, union_x2);
+ new_y2 = MIN (clip_y2, union_y2);
+
+ if (new_x1 >= new_x2 || new_y1 >= new_y2)
+ return art_uta_new (clip_x1, clip_y1, clip_x1 + 1, clip_y1 + 1);
+
+ /* Make the new clipped union */
+
+ uta = art_new (ArtUta, 1);
+ uta->x0 = new_x1;
+ uta->y0 = new_y1;
+ uta->width = new_x2 - new_x1;
+ uta->height = new_y2 - new_y1;
+ uta->utiles = utiles = art_new (ArtUtaBbox, uta->width * uta->height);
+
+ ofs = 0;
+ ofs1 = ofs2 = 0;
+
+ for (y = new_y1; y < new_y2; y++) {
+ if (uta1)
+ ofs1 = (y - uta1->y0) * uta1->width + new_x1 - uta1->x0;
+
+ if (uta2)
+ ofs2 = (y - uta2->y0) * uta2->width + new_x1 - uta2->x0;
+
+ for (x = new_x1; x < new_x2; x++) {
+ ArtUtaBbox bb1, bb2, bb;
+
+ if (!uta1
+ || x < uta1->x0 || y < uta1->y0
+ || x >= uta1->x0 + uta1->width || y >= uta1->y0 + uta1->height)
+ bb1 = 0;
+ else
+ bb1 = uta1->utiles[ofs1];
+
+ if (!uta2
+ || x < uta2->x0 || y < uta2->y0
+ || x >= uta2->x0 + uta2->width || y >= uta2->y0 + uta2->height)
+ bb2 = 0;
+ else
+ bb2 = uta2->utiles[ofs2];
+
+ if (bb1 == 0)
+ bb = bb2;
+ else if (bb2 == 0)
+ bb = bb1;
+ else
+ bb = ART_UTA_BBOX_CONS (MIN (ART_UTA_BBOX_X0 (bb1),
+ ART_UTA_BBOX_X0 (bb2)),
+ MIN (ART_UTA_BBOX_Y0 (bb1),
+ ART_UTA_BBOX_Y0 (bb2)),
+ MAX (ART_UTA_BBOX_X1 (bb1),
+ ART_UTA_BBOX_X1 (bb2)),
+ MAX (ART_UTA_BBOX_Y1 (bb1),
+ ART_UTA_BBOX_Y1 (bb2)));
+
+ utiles[ofs] = bb;
+
+ ofs++;
+ ofs1++;
+ ofs2++;
+ }
+ }
+
+ return uta;
+}
+
+static inline void
+get_visible_region (GnomeCanvas *canvas, ArtIRect *visible)
+{
+ visible->x0 = canvas->layout.hadjustment->value - canvas->zoom_xofs;
+ visible->y0 = canvas->layout.vadjustment->value - canvas->zoom_yofs;
+ visible->x1 = visible->x0 + GTK_WIDGET (canvas)->allocation.width;
+ visible->y1 = visible->y0 + GTK_WIDGET (canvas)->allocation.height;
+}
+
+/**
+ * gnome_canvas_request_redraw_uta:
+ * @canvas: A canvas.
+ * @uta: Microtile array that specifies the area to be redrawn. It will
+ * be freed by this function, so the argument you pass will be invalid
+ * after you call this function.
+ *
+ * Informs a canvas that the specified area, given as a microtile array, needs
+ * to be repainted. To be used only by item implementations.
+ **/
+void
+gnome_canvas_request_redraw_uta (GnomeCanvas *canvas,
+ ArtUta *uta)
+{
+ ArtIRect visible;
+
+ g_return_if_fail (GNOME_IS_CANVAS (canvas));
+ g_return_if_fail (uta != NULL);
+
+ if (!GTK_WIDGET_DRAWABLE (canvas)) {
+ art_uta_free (uta);
+ return;
+ }
+
+ get_visible_region (canvas, &visible);
+
+ if (canvas->need_redraw) {
+ ArtUta *new_uta;
+
+ g_assert (canvas->redraw_area != NULL);
+ /* ALEX: This can fail if e.g. redraw_uta is called by an item
+ update function and we're called from update_now -> do_update
+ because update_now sets idle_id == 0. There is also some way
+ to get it from the expose handler (see bug #102811).
+ g_assert (canvas->idle_id != 0); */
+
+ new_uta = uta_union_clip (canvas->redraw_area, uta, &visible);
+ art_uta_free (canvas->redraw_area);
+ art_uta_free (uta);
+ canvas->redraw_area = new_uta;
+ if (canvas->idle_id == 0)
+ add_idle (canvas);
+ } else {
+ ArtUta *new_uta;
+
+ g_assert (canvas->redraw_area == NULL);
+
+ new_uta = uta_union_clip (uta, NULL, &visible);
+ art_uta_free (uta);
+ canvas->redraw_area = new_uta;
+
+ canvas->need_redraw = TRUE;
+ add_idle (canvas);
+ }
+}
+
+
+/**
+ * gnome_canvas_request_redraw:
+ * @canvas: A canvas.
+ * @x1: Leftmost coordinate of the rectangle to be redrawn.
+ * @y1: Upper coordinate of the rectangle to be redrawn.
+ * @x2: Rightmost coordinate of the rectangle to be redrawn, plus 1.
+ * @y2: Lower coordinate of the rectangle to be redrawn, plus 1.
+ *
+ * Convenience function that informs a canvas that the specified rectangle needs
+ * to be repainted. This function converts the rectangle to a microtile array
+ * and feeds it to gnome_canvas_request_redraw_uta(). The rectangle includes
+ * @x1 and @y1, but not @x2 and @y2. To be used only by item implementations.
+ **/
+void
+gnome_canvas_request_redraw (GnomeCanvas *canvas, int x1, int y1, int x2, int y2)
+{
+ ArtUta *uta;
+ ArtIRect bbox;
+ ArtIRect visible;
+ ArtIRect clip;
+
+ g_return_if_fail (GNOME_IS_CANVAS (canvas));
+
+ if (!GTK_WIDGET_DRAWABLE (canvas) || (x1 >= x2) || (y1 >= y2))
+ return;
+
+ bbox.x0 = x1;
+ bbox.y0 = y1;
+ bbox.x1 = x2;
+ bbox.y1 = y2;
+
+ get_visible_region (canvas, &visible);
+
+ art_irect_intersect (&clip, &bbox, &visible);
+
+ if (!art_irect_empty (&clip)) {
+ uta = art_uta_from_irect (&clip);
+ gnome_canvas_request_redraw_uta (canvas, uta);
+ }
+}
+
+
+/**
+ * gnome_canvas_w2c_affine:
+ * @canvas: A canvas.
+ * @affine: An affine transformation matrix (return value).
+ *
+ * Gets the affine transform that converts from world coordinates to canvas
+ * pixel coordinates.
+ **/
+void
+gnome_canvas_w2c_affine (GnomeCanvas *canvas, double affine[6])
+{
+ double zooom;
+
+ g_return_if_fail (GNOME_IS_CANVAS (canvas));
+ g_return_if_fail (affine != NULL);
+
+ zooom = canvas->pixels_per_unit;
+
+ affine[0] = zooom;
+ affine[1] = 0;
+ affine[2] = 0;
+ affine[3] = zooom;
+ affine[4] = -canvas->scroll_x1 * zooom;
+ affine[5] = -canvas->scroll_y1 * zooom;
+}
+
+/**
+ * gnome_canvas_w2c:
+ * @canvas: A canvas.
+ * @wx: World X coordinate.
+ * @wy: World Y coordinate.
+ * @cx: X pixel coordinate (return value).
+ * @cy: Y pixel coordinate (return value).
+ *
+ * Converts world coordinates into canvas pixel coordinates.
+ **/
+void
+gnome_canvas_w2c (GnomeCanvas *canvas, double wx, double wy, int *cx, int *cy)
+{
+ double affine[6];
+ ArtPoint w, c;
+
+ g_return_if_fail (GNOME_IS_CANVAS (canvas));
+
+ gnome_canvas_w2c_affine (canvas, affine);
+ w.x = wx;
+ w.y = wy;
+ art_affine_point (&c, &w, affine);
+ if (cx)
+ *cx = floor (c.x + 0.5);
+ if (cy)
+ *cy = floor (c.y + 0.5);
+}
+
+/**
+ * gnome_canvas_w2c_d:
+ * @canvas: A canvas.
+ * @wx: World X coordinate.
+ * @wy: World Y coordinate.
+ * @cx: X pixel coordinate (return value).
+ * @cy: Y pixel coordinate (return value).
+ *
+ * Converts world coordinates into canvas pixel coordinates. This
+ * version returns coordinates in floating point coordinates, for
+ * greater precision.
+ **/
+void
+gnome_canvas_w2c_d (GnomeCanvas *canvas, double wx, double wy, double *cx, double *cy)
+{
+ double affine[6];
+ ArtPoint w, c;
+
+ g_return_if_fail (GNOME_IS_CANVAS (canvas));
+
+ gnome_canvas_w2c_affine (canvas, affine);
+ w.x = wx;
+ w.y = wy;
+ art_affine_point (&c, &w, affine);
+ if (cx)
+ *cx = c.x;
+ if (cy)
+ *cy = c.y;
+}
+
+
+/**
+ * gnome_canvas_c2w:
+ * @canvas: A canvas.
+ * @cx: Canvas pixel X coordinate.
+ * @cy: Canvas pixel Y coordinate.
+ * @wx: X world coordinate (return value).
+ * @wy: Y world coordinate (return value).
+ *
+ * Converts canvas pixel coordinates to world coordinates.
+ **/
+void
+gnome_canvas_c2w (GnomeCanvas *canvas, int cx, int cy, double *wx, double *wy)
+{
+ double affine[6], inv[6];
+ ArtPoint w, c;
+
+ g_return_if_fail (GNOME_IS_CANVAS (canvas));
+
+ gnome_canvas_w2c_affine (canvas, affine);
+ art_affine_invert (inv, affine);
+ c.x = cx;
+ c.y = cy;
+ art_affine_point (&w, &c, inv);
+ if (wx)
+ *wx = w.x;
+ if (wy)
+ *wy = w.y;
+}
+
+
+/**
+ * gnome_canvas_window_to_world:
+ * @canvas: A canvas.
+ * @winx: Window-relative X coordinate.
+ * @winy: Window-relative Y coordinate.
+ * @worldx: X world coordinate (return value).
+ * @worldy: Y world coordinate (return value).
+ *
+ * Converts window-relative coordinates into world coordinates. You can use
+ * this when you need to convert mouse coordinates into world coordinates, for
+ * example.
+ **/
+void
+gnome_canvas_window_to_world (GnomeCanvas *canvas, double winx, double winy,
+ double *worldx, double *worldy)
+{
+ g_return_if_fail (GNOME_IS_CANVAS (canvas));
+
+ if (worldx)
+ *worldx = canvas->scroll_x1 + ((winx - canvas->zoom_xofs)
+ / canvas->pixels_per_unit);
+
+ if (worldy)
+ *worldy = canvas->scroll_y1 + ((winy - canvas->zoom_yofs)
+ / canvas->pixels_per_unit);
+}
+
+
+/**
+ * gnome_canvas_world_to_window:
+ * @canvas: A canvas.
+ * @worldx: World X coordinate.
+ * @worldy: World Y coordinate.
+ * @winx: X window-relative coordinate.
+ * @winy: Y window-relative coordinate.
+ *
+ * Converts world coordinates into window-relative coordinates.
+ **/
+void
+gnome_canvas_world_to_window (GnomeCanvas *canvas, double worldx, double worldy,
+ double *winx, double *winy)
+{
+ g_return_if_fail (GNOME_IS_CANVAS (canvas));
+
+ if (winx)
+ *winx = (canvas->pixels_per_unit)*(worldx - canvas->scroll_x1) + canvas->zoom_xofs;
+
+ if (winy)
+ *winy = (canvas->pixels_per_unit)*(worldy - canvas->scroll_y1) + canvas->zoom_yofs;
+}
+
+
+
+/**
+ * gnome_canvas_get_color:
+ * @canvas: A canvas.
+ * @spec: X color specification, or NULL for "transparent".
+ * @color: Returns the allocated color.
+ *
+ * Allocates a color based on the specified X color specification. As a
+ * convenience to item implementations, it returns TRUE if the color was
+ * allocated, or FALSE if the specification was NULL. A NULL color
+ * specification is considered as "transparent" by the canvas.
+ *
+ * Return value: TRUE if @spec is non-NULL and the color is allocated. If @spec
+ * is NULL, then returns FALSE.
+ **/
+int
+gnome_canvas_get_color (GnomeCanvas *canvas, const char *spec, GdkColor *color)
+{
+ GdkColormap *colormap;
+
+ g_return_val_if_fail (GNOME_IS_CANVAS (canvas), FALSE);
+ g_return_val_if_fail (color != NULL, FALSE);
+
+ if (!spec) {
+ color->pixel = 0;
+ color->red = 0;
+ color->green = 0;
+ color->blue = 0;
+ return FALSE;
+ }
+
+ gdk_color_parse (spec, color);
+
+ colormap = gtk_widget_get_colormap (GTK_WIDGET (canvas));
+
+ gdk_rgb_find_color (colormap, color);
+
+ return TRUE;
+}
+
+/**
+ * gnome_canvas_get_color_pixel:
+ * @canvas: A canvas.
+ * @rgba: RGBA color specification.
+ *
+ * Allocates a color from the RGBA value passed into this function. The alpha
+ * opacity value is discarded, since normal X colors do not support it.
+ *
+ * Return value: Allocated pixel value corresponding to the specified color.
+ **/
+gulong
+gnome_canvas_get_color_pixel (GnomeCanvas *canvas, guint rgba)
+{
+ GdkColormap *colormap;
+ GdkColor color;
+
+ g_return_val_if_fail (GNOME_IS_CANVAS (canvas), 0);
+
+ color.red = ((rgba & 0xff000000) >> 16) + ((rgba & 0xff000000) >> 24);
+ color.green = ((rgba & 0x00ff0000) >> 8) + ((rgba & 0x00ff0000) >> 16);
+ color.blue = (rgba & 0x0000ff00) + ((rgba & 0x0000ff00) >> 8);
+ color.pixel = 0;
+
+ colormap = gtk_widget_get_colormap (GTK_WIDGET (canvas));
+
+ gdk_rgb_find_color (colormap, &color);
+
+ return color.pixel;
+}
+
+
+/**
+ * gnome_canvas_set_stipple_origin:
+ * @canvas: A canvas.
+ * @gc: GC on which to set the stipple origin.
+ *
+ * Sets the stipple origin of the specified GC as is appropriate for the canvas,
+ * so that it will be aligned with other stipple patterns used by canvas items.
+ * This is typically only needed by item implementations.
+ **/
+void
+gnome_canvas_set_stipple_origin (GnomeCanvas *canvas, GdkGC *gc)
+{
+ g_return_if_fail (GNOME_IS_CANVAS (canvas));
+ g_return_if_fail (GDK_IS_GC (gc));
+
+ gdk_gc_set_ts_origin (gc, -canvas->draw_xofs, -canvas->draw_yofs);
+}
+
+/**
+ * gnome_canvas_set_dither:
+ * @canvas: A canvas.
+ * @dither: Type of dithering used to render an antialiased canvas.
+ *
+ * Controls dithered rendering for antialiased canvases. The value of
+ * dither should be #GDK_RGB_DITHER_NONE, #GDK_RGB_DITHER_NORMAL, or
+ * #GDK_RGB_DITHER_MAX. The default canvas setting is
+ * #GDK_RGB_DITHER_NORMAL.
+ **/
+void
+gnome_canvas_set_dither (GnomeCanvas *canvas, GdkRgbDither dither)
+{
+ g_return_if_fail (GNOME_IS_CANVAS (canvas));
+
+ canvas->dither = dither;
+}
+
+/**
+ * gnome_canvas_get_dither:
+ * @canvas: A canvas.
+ *
+ * Returns the type of dithering used to render an antialiased canvas.
+ *
+ * Return value: The dither setting.
+ **/
+GdkRgbDither
+gnome_canvas_get_dither (GnomeCanvas *canvas)
+{
+ g_return_val_if_fail (GNOME_IS_CANVAS (canvas), GDK_RGB_DITHER_NONE);
+
+ return canvas->dither;
+}
+
+static gboolean
+boolean_handled_accumulator (GSignalInvocationHint *ihint,
+ GValue *return_accu,
+ const GValue *handler_return,
+ gpointer dummy)
+{
+ gboolean continue_emission;
+ gboolean signal_handled;
+
+ signal_handled = g_value_get_boolean (handler_return);
+ g_value_set_boolean (return_accu, signal_handled);
+ continue_emission = !signal_handled;
+
+ return continue_emission;
+}
+
+/* Class initialization function for GnomeCanvasItemClass */
+static void
+gnome_canvas_item_class_init (GnomeCanvasItemClass *class)
+{
+ GObjectClass *gobject_class;
+
+ gobject_class = (GObjectClass *) class;
+
+ item_parent_class = g_type_class_peek_parent (class);
+
+ gobject_class->set_property = gnome_canvas_item_set_property;
+ gobject_class->get_property = gnome_canvas_item_get_property;
+
+ g_object_class_install_property
+ (gobject_class, ITEM_PROP_PARENT,
+ g_param_spec_object ("parent", NULL, NULL,
+ GNOME_TYPE_CANVAS_ITEM,
+ (G_PARAM_READABLE | G_PARAM_WRITABLE)));
+
+ item_signals[ITEM_EVENT] =
+ g_signal_new ("event",
+ G_TYPE_FROM_CLASS (class),
+ G_SIGNAL_RUN_LAST,
+ G_STRUCT_OFFSET (GnomeCanvasItemClass, event),
+ boolean_handled_accumulator, NULL,
+ gnome_canvas_marshal_BOOLEAN__BOXED,
+ G_TYPE_BOOLEAN, 1,
+ GDK_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE);
+
+ gobject_class->dispose = gnome_canvas_item_dispose;
+
+ class->realize = gnome_canvas_item_realize;
+ class->unrealize = gnome_canvas_item_unrealize;
+ class->map = gnome_canvas_item_map;
+ class->unmap = gnome_canvas_item_unmap;
+ class->update = gnome_canvas_item_update;
+}
projects / ardour.git / blobdiff