+++ /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!", (void*) 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