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Diffstat (limited to 'libgnomecanvas/gnome-canvas.c')
| -rw-r--r-- | libgnomecanvas/gnome-canvas.c | 3419 |
1 files changed, 3419 insertions, 0 deletions
diff --git a/libgnomecanvas/gnome-canvas.c b/libgnomecanvas/gnome-canvas.c new file mode 100644 index 0000000000..04facd28e8 --- /dev/null +++ b/libgnomecanvas/gnome-canvas.c @@ -0,0 +1,3419 @@ +/* -*- 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. + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <math.h> +#include <string.h> +#include <stdio.h> +#include <gdk/gdkprivate.h> +#include <gtk/gtk.h> +#include <cairo-gobject.h> +#include "gailcanvas.h" +#include "gnome-canvas.h" +#include "gnome-canvas-i18n.h" +#include "gnome-canvas-util.h" + +/* 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 gint emit_event (GnomeCanvas *canvas, GdkEvent *event); + +static guint item_signals[ITEM_LAST_SIGNAL]; + +G_DEFINE_TYPE ( + GnomeCanvasItem, + gnome_canvas_item, + G_TYPE_INITIALLY_UNOWNED) + +/* Object initialization function for GnomeCanvasItem */ +static void +gnome_canvas_item_init (GnomeCanvasItem *item) +{ + item->flags |= GNOME_CANVAS_ITEM_VISIBLE; + + cairo_matrix_init_identity (&item->matrix); +} + +/** + * 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 property_id, + const GValue *value, + GParamSpec *pspec) +{ + GnomeCanvasItem *item; + + g_return_if_fail (GNOME_IS_CANVAS_ITEM (gobject)); + + item = GNOME_CANVAS_ITEM (gobject); + + switch (property_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, property_id, pspec); + break; + } +} + +/* Get_property handler for canvas items */ +static void +gnome_canvas_item_get_property (GObject *gobject, + guint property_id, + GValue *value, + GParamSpec *pspec) +{ + GnomeCanvasItem *item; + + g_return_if_fail (GNOME_IS_CANVAS_ITEM (gobject)); + + item = GNOME_CANVAS_ITEM (gobject); + + switch (property_id) { + case ITEM_PROP_PARENT: + g_value_set_object (value, item->parent); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, property_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->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_device_ungrab ( + item->canvas->grabbed_device, GDK_CURRENT_TIME); + g_object_unref (item->canvas->grabbed_device); + item->canvas->grabbed_device = NULL; + } + + if (item->canvas && item == item->canvas->focused_item) + item->canvas->focused_item = NULL; + + /* Normal dispose stuff */ + + if (item->flags & GNOME_CANVAS_ITEM_MAPPED) + (* GNOME_CANVAS_ITEM_GET_CLASS (item)->unmap) (item); + + if (item->flags & GNOME_CANVAS_ITEM_REALIZED) + (* GNOME_CANVAS_ITEM_GET_CLASS (item)->unrealize) (item); + + if (item->parent) + group_remove (GNOME_CANVAS_GROUP (item->parent), item); + + if (GNOME_CANVAS_ITEM_GET_CLASS (item)->dispose) + GNOME_CANVAS_ITEM_GET_CLASS (item)->dispose (item); + + G_OBJECT_CLASS (gnome_canvas_item_parent_class)->dispose (object); + /* items should remove any reference to item->canvas after the + * first ::dispose */ + item->canvas = NULL; +} + +/* Update handler for canvas items */ +static void +gnome_canvas_item_update (GnomeCanvasItem *item, + const cairo_matrix_t *matrix, + gint flags) +{ + item->flags &= ~GNOME_CANVAS_ITEM_NEED_UPDATE; + item->flags &= ~GNOME_CANVAS_ITEM_NEED_AFFINE; + item->flags &= ~GNOME_CANVAS_ITEM_NEED_CLIP; + item->flags &= ~GNOME_CANVAS_ITEM_NEED_VIS; +} + +/* Realize handler for canvas items */ +static void +gnome_canvas_item_realize (GnomeCanvasItem *item) +{ + item->flags |= GNOME_CANVAS_ITEM_REALIZED; + + gnome_canvas_item_request_update (item); +} + +/* Unrealize handler for canvas items */ +static void +gnome_canvas_item_unrealize (GnomeCanvasItem *item) +{ + item->flags &= ~GNOME_CANVAS_ITEM_REALIZED; +} + +/* Map handler for canvas items */ +static void +gnome_canvas_item_map (GnomeCanvasItem *item) +{ + item->flags |= GNOME_CANVAS_ITEM_MAPPED; +} + +/* Unmap handler for canvas items */ +static void +gnome_canvas_item_unmap (GnomeCanvasItem *item) +{ + item->flags &= ~GNOME_CANVAS_ITEM_MAPPED; +} + +/* Dispose handler for canvas items */ +static void +gnome_canvas_item_dispose_item (GnomeCanvasItem *item) +{ + /* Placeholder so subclasses can safely chain up. */ +} + +static void +gnome_canvas_item_draw (GnomeCanvasItem *item, + cairo_t *cr, + gint x, + gint y, + gint width, + gint height) +{ + /* Placeholder so subclasses can safely chain up. */ +} + +static GnomeCanvasItem * +gnome_canvas_item_point (GnomeCanvasItem *item, + gdouble x, + gdouble y, + gint cx, + gint cy) +{ + /* Placeholder so subclasses can safely chain up. */ + + return NULL; +} + +static void +gnome_canvas_item_bounds (GnomeCanvasItem *item, + gdouble *x1, + gdouble *y1, + gdouble *x2, + gdouble *y2) +{ + /* Placeholder so subclasses can safely chain up. */ +} + +static gboolean +gnome_canvas_item_event (GnomeCanvasItem *item, + GdkEvent *event) +{ + /* Placeholder so subclasses can safely chain up. */ + + return FALSE; /* event was not handled */ +} + +/* + * 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, + const cairo_matrix_t *p2c, + gint flags) +{ + gint child_flags; + cairo_matrix_t i2c; + + child_flags = flags; + if (!(item->flags & GNOME_CANVAS_ITEM_VISIBLE)) + child_flags &= ~GNOME_CANVAS_UPDATE_IS_VISIBLE; + + /* Calculate actual item transformation matrix */ + + cairo_matrix_multiply (&i2c, &item->matrix, p2c); + + /* apply object flags to child flags */ + + child_flags &= ~GNOME_CANVAS_UPDATE_REQUESTED; + + if (item->flags & GNOME_CANVAS_ITEM_NEED_UPDATE) + child_flags |= GNOME_CANVAS_UPDATE_REQUESTED; + + if (item->flags & GNOME_CANVAS_ITEM_NEED_AFFINE) + child_flags |= GNOME_CANVAS_UPDATE_AFFINE; + + if (item->flags & GNOME_CANVAS_ITEM_NEED_CLIP) + child_flags |= GNOME_CANVAS_UPDATE_CLIP; + + if (item->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, &i2c, 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 GnomeCanvasItem * +gnome_canvas_item_invoke_point (GnomeCanvasItem *item, + gdouble x, + gdouble y, + gint cx, + gint cy) +{ + cairo_matrix_t inverse; + + /* Calculate x & y in item local coordinates */ + inverse = item->matrix; + if (cairo_matrix_invert (&inverse) != CAIRO_STATUS_SUCCESS) + return NULL; + + cairo_matrix_transform_point (&inverse, &x, &y); + + if (GNOME_CANVAS_ITEM_GET_CLASS (item)->point) + return GNOME_CANVAS_ITEM_GET_CLASS (item)->point (item, x, y, cx, cy); + + return NULL; +} + +/** + * 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); + + item->canvas->need_repick = TRUE; +} + +/** + * gnome_canvas_item_transform: + * @item: A canvas item. + * @matrix: An affine transformation matrix. + * + * Combines the specified affine transformation matrix with the item's current + * transformation. + **/ +void +gnome_canvas_item_transform (GnomeCanvasItem *item, + const cairo_matrix_t *matrix) +{ + cairo_matrix_t i2p; + + g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); + g_return_if_fail (matrix != NULL); + + /* Calculate actual item transformation matrix */ + cairo_matrix_multiply (&i2p, matrix, &item->matrix); + + gnome_canvas_item_set_matrix (item, &i2p); +} + +/** + * gnome_canvas_item_set_matrix: + * @item: A canvas item. + * @matrix: An affine transformation matrix or %NULL for the identity matrix. + * + * Makes the item's affine transformation matrix be equal to the specified + * matrix. NULL is treated as identity. + **/ +void +gnome_canvas_item_set_matrix (GnomeCanvasItem *item, + const cairo_matrix_t *matrix) +{ + g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); + + if (matrix) { + item->matrix = *matrix; + } else { + cairo_matrix_init_identity (&item->matrix); + } + + if (!(item->flags & GNOME_CANVAS_ITEM_NEED_AFFINE)) { + /* Request update */ + item->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, + gdouble dx, + gdouble dy) +{ + cairo_matrix_t translate; + + g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); + + cairo_matrix_init_translate (&translate, dx, dy); + + gnome_canvas_item_transform (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, + gint 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_return_if_fail (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, + gint 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_return_if_fail (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_return_if_fail (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_return_if_fail (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->flags & GNOME_CANVAS_ITEM_VISIBLE)) { + item->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->flags & GNOME_CANVAS_ITEM_VISIBLE) { + item->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. + * @device: The pointer device to grab. + * @etime: The timestamp required for grabbing @device, or GDK_CURRENT_TIME. + * + * Specifies that all events that match the specified event mask should be sent + * to the specified item, and also grabs @device by calling gdk_device_grab(). + * The event mask is also used when grabbing the @device. 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 @device. + * + * 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_device_grab(). + **/ +gint +gnome_canvas_item_grab (GnomeCanvasItem *item, + guint event_mask, + GdkCursor *cursor, + GdkDevice *device, + guint32 etime) +{ + GtkLayout *layout; + GdkWindow *bin_window; + gint retval; + + g_return_val_if_fail ( + GNOME_IS_CANVAS_ITEM (item), GDK_GRAB_NOT_VIEWABLE); + g_return_val_if_fail ( + gtk_widget_get_mapped (GTK_WIDGET (item->canvas)), + GDK_GRAB_NOT_VIEWABLE); + g_return_val_if_fail ( + GDK_IS_DEVICE (device), GDK_GRAB_NOT_VIEWABLE); + + if (item->canvas->grabbed_item) + return GDK_GRAB_ALREADY_GRABBED; + + if (!(item->flags & GNOME_CANVAS_ITEM_VISIBLE)) + return GDK_GRAB_NOT_VIEWABLE; + + layout = GTK_LAYOUT (item->canvas); + bin_window = gtk_layout_get_bin_window (layout); + + retval = gdk_device_grab ( + device, bin_window, GDK_OWNERSHIP_NONE, + FALSE, event_mask, cursor, etime); + + if (retval != GDK_GRAB_SUCCESS) + return retval; + + item->canvas->grabbed_item = item; + item->canvas->grabbed_device = g_object_ref (device); + 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; + + g_return_if_fail (item->canvas->grabbed_device != NULL); + gdk_device_ungrab (item->canvas->grabbed_device, etime); + + g_object_unref (item->canvas->grabbed_device); + item->canvas->grabbed_device = NULL; +} + +void +gnome_canvas_item_i2w_matrix (GnomeCanvasItem *item, + cairo_matrix_t *matrix) +{ + g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); + g_return_if_fail (matrix != NULL); + + cairo_matrix_init_identity (matrix); + + while (item) { + cairo_matrix_multiply (matrix, matrix, &item->matrix); + + item = item->parent; + } +} + +void +gnome_canvas_item_w2i_matrix (GnomeCanvasItem *item, + cairo_matrix_t *matrix) +{ + cairo_status_t status; + + g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); + g_return_if_fail (matrix != NULL); + + gnome_canvas_item_i2w_matrix (item, matrix); + status = cairo_matrix_invert (matrix); + g_return_if_fail (status == CAIRO_STATUS_SUCCESS); +} + +/** + * 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, + gdouble *x, + gdouble *y) +{ + cairo_matrix_t matrix; + + g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); + g_return_if_fail (x != NULL); + g_return_if_fail (y != NULL); + + gnome_canvas_item_w2i_matrix (item, &matrix); + cairo_matrix_transform_point (&matrix, x, 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, + gdouble *x, + gdouble *y) +{ + cairo_matrix_t matrix; + + 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_matrix (item, &matrix); + cairo_matrix_transform_point (&matrix, x, y); +} + +/** + * gnome_canvas_item_i2c_matrix: + * @item: A canvas item. + * @matrix: Matrix to take the resulting transformation matrix (return value). + * + * Gets the affine transform that converts from item-relative coordinates to + * canvas pixel coordinates. + **/ +void +gnome_canvas_item_i2c_matrix (GnomeCanvasItem *item, + cairo_matrix_t *matrix) +{ + cairo_matrix_t i2w, w2c; + + gnome_canvas_item_i2w_matrix (item, &i2w); + gnome_canvas_w2c_matrix (item->canvas, &w2c); + cairo_matrix_multiply (matrix, &i2w, &w2c); +} + +/* Returns whether the item is an inferior of or is equal to the parent. */ +static gint +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 (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 (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_get_can_focus (GTK_WIDGET (item->canvas))); + + focused_item = item->canvas->focused_item; + + if (focused_item) { + GtkLayout *layout; + GdkWindow *bin_window; + + layout = GTK_LAYOUT (item->canvas); + bin_window = gtk_layout_get_bin_window (layout); + + ev.focus_change.type = GDK_FOCUS_CHANGE; + ev.focus_change.window = 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) { + GtkLayout *layout; + GdkWindow *bin_window; + + layout = GTK_LAYOUT (item->canvas); + bin_window = gtk_layout_get_bin_window (layout); + + ev.focus_change.type = GDK_FOCUS_CHANGE; + ev.focus_change.window = 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, + gdouble *x1, + gdouble *y1, + gdouble *x2, + gdouble *y2) +{ + gdouble tx1, ty1, tx2, ty2; + + 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 */ + gnome_canvas_matrix_transform_rect (&item->matrix, &tx1, &ty1, &tx2, &ty2); + + /* 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->flags & GNOME_CANVAS_ITEM_NEED_UPDATE) + return; + + item->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_set_property (GObject *object, + guint property_id, + const GValue *value, + GParamSpec *pspec); +static void gnome_canvas_group_get_property (GObject *object, + guint property_id, + GValue *value, + GParamSpec *pspec); + +static void gnome_canvas_group_dispose (GnomeCanvasItem *object); + +static void gnome_canvas_group_update (GnomeCanvasItem *item, + const cairo_matrix_t *matrix, + gint 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, + cairo_t *cr, + gint x, gint y, + gint width, gint height); +static GnomeCanvasItem *gnome_canvas_group_point (GnomeCanvasItem *item, + gdouble x, gdouble y, + gint cx, gint cy); +static void gnome_canvas_group_bounds (GnomeCanvasItem *item, + gdouble *x1, gdouble *y1, + gdouble *x2, gdouble *y2); + +G_DEFINE_TYPE ( + GnomeCanvasGroup, + gnome_canvas_group, + GNOME_TYPE_CANVAS_ITEM) + +/* Class initialization function for GnomeCanvasGroupClass */ +static void +gnome_canvas_group_class_init (GnomeCanvasGroupClass *class) +{ + GObjectClass *object_class; + GnomeCanvasItemClass *item_class; + + object_class = (GObjectClass *) class; + item_class = (GnomeCanvasItemClass *) class; + + object_class->set_property = gnome_canvas_group_set_property; + object_class->get_property = gnome_canvas_group_get_property; + + g_object_class_install_property ( + object_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 ( + object_class, + GROUP_PROP_Y, + g_param_spec_double ( + "y", + "Y", + "Y", + -G_MAXDOUBLE, + G_MAXDOUBLE, + 0.0, + G_PARAM_READABLE | + G_PARAM_WRITABLE)); + + item_class->dispose = gnome_canvas_group_dispose; + 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->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) +{ +} + +/* Set_property handler for canvas groups */ +static void +gnome_canvas_group_set_property (GObject *gobject, + guint property_id, + const GValue *value, + GParamSpec *pspec) +{ + GnomeCanvasItem *item; + + g_return_if_fail (GNOME_IS_CANVAS_GROUP (gobject)); + + item = GNOME_CANVAS_ITEM (gobject); + + switch (property_id) { + case GROUP_PROP_X: + item->matrix.x0 = g_value_get_double (value); + break; + + case GROUP_PROP_Y: + item->matrix.y0 = g_value_get_double (value); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, property_id, pspec); + break; + } +} + +/* Get_property handler for canvas groups */ +static void +gnome_canvas_group_get_property (GObject *gobject, + guint property_id, + GValue *value, + GParamSpec *pspec) +{ + GnomeCanvasItem *item; + + g_return_if_fail (GNOME_IS_CANVAS_GROUP (gobject)); + + item = GNOME_CANVAS_ITEM (gobject); + + switch (property_id) { + case GROUP_PROP_X: + g_value_set_double (value, item->matrix.x0); + break; + + case GROUP_PROP_Y: + g_value_set_double (value, item->matrix.y0); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, property_id, pspec); + break; + } +} + +/* Dispose handler for canvas groups */ +static void +gnome_canvas_group_dispose (GnomeCanvasItem *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 (). */ + g_object_run_dispose (G_OBJECT (group->item_list->data)); + } + + GNOME_CANVAS_ITEM_CLASS (gnome_canvas_group_parent_class)-> + dispose (object); +} + +/* Update handler for canvas groups */ +static void +gnome_canvas_group_update (GnomeCanvasItem *item, + const cairo_matrix_t *i2c, + gint flags) +{ + GnomeCanvasGroup *group; + GList *list; + GnomeCanvasItem *i; + gdouble x1, y1, x2, y2; + + group = GNOME_CANVAS_GROUP (item); + + GNOME_CANVAS_ITEM_CLASS (gnome_canvas_group_parent_class)-> + update (item, i2c, flags); + + x1 = G_MAXDOUBLE; + y1 = G_MAXDOUBLE; + x2 = -G_MAXDOUBLE; + y2 = -G_MAXDOUBLE; + + for (list = group->item_list; list; list = list->next) { + i = list->data; + + gnome_canvas_item_invoke_update (i, i2c, flags); + + x1 = MIN (x1, i->x1); + x2 = MAX (x2, i->x2); + y1 = MIN (y1, i->y1); + y2 = MAX (y2, i->y2); + } + if (x1 >= x2 || y1 >= y2) { + item->x1 = item->x2 = item->y1 = item->y2 = 0; + } else { + item->x1 = x1; + item->y1 = y1; + item->x2 = x2; + item->y2 = y2; + } +} + +/* 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->flags & GNOME_CANVAS_ITEM_REALIZED)) + (* GNOME_CANVAS_ITEM_GET_CLASS (i)->realize) (i); + } + + GNOME_CANVAS_ITEM_CLASS (gnome_canvas_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->flags & GNOME_CANVAS_ITEM_REALIZED) + (* GNOME_CANVAS_ITEM_GET_CLASS (i)->unrealize) (i); + } + + GNOME_CANVAS_ITEM_CLASS (gnome_canvas_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->flags & GNOME_CANVAS_ITEM_MAPPED)) + (* GNOME_CANVAS_ITEM_GET_CLASS (i)->map) (i); + } + + GNOME_CANVAS_ITEM_CLASS (gnome_canvas_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->flags & GNOME_CANVAS_ITEM_MAPPED) + (* GNOME_CANVAS_ITEM_GET_CLASS (i)->unmap) (i); + } + + GNOME_CANVAS_ITEM_CLASS (gnome_canvas_group_parent_class)->unmap (item); +} + +/* Draw handler for canvas groups */ +static void +gnome_canvas_group_draw (GnomeCanvasItem *item, + cairo_t *cr, + gint x, + gint y, + gint width, + gint 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->flags & GNOME_CANVAS_ITEM_VISIBLE) + && ((child->x1 < (x + width)) + && (child->y1 < (y + height)) + && (child->x2 > x) + && (child->y2 > y))) { + cairo_save (cr); + + GNOME_CANVAS_ITEM_GET_CLASS (child)->draw ( + child, cr, x, y, width, height); + + cairo_restore (cr); + } + } +} + +/* Point handler for canvas groups */ +static GnomeCanvasItem * +gnome_canvas_group_point (GnomeCanvasItem *item, + gdouble x, + gdouble y, + gint cx, + gint cy) +{ + GnomeCanvasGroup *group; + GList *list; + GnomeCanvasItem *child, *point_item; + + group = GNOME_CANVAS_GROUP (item); + + for (list = g_list_last (group->item_list); list; list = list->prev) { + child = list->data; + + if ((child->x1 > cx) || (child->y1 > cy)) + continue; + + if ((child->x2 < cx) || (child->y2 < cy)) + continue; + + if (!(child->flags & GNOME_CANVAS_ITEM_VISIBLE)) + continue; + + point_item = gnome_canvas_item_invoke_point (child, x, y, cx, cy); + if (point_item) + return point_item; + } + + return NULL; +} + +/* Bounds handler for canvas groups */ +static void +gnome_canvas_group_bounds (GnomeCanvasItem *item, + gdouble *x1, + gdouble *y1, + gdouble *x2, + gdouble *y2) +{ + GnomeCanvasGroup *group; + GnomeCanvasItem *child; + GList *list; + gdouble tx1, ty1, tx2, ty2; + gdouble minx, miny, maxx, maxy; + gint 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->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->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; +} + +/* Adds an item to a group */ +static void +group_add (GnomeCanvasGroup *group, + GnomeCanvasItem *item) +{ + g_object_ref_sink (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.flags & GNOME_CANVAS_ITEM_REALIZED) + (* GNOME_CANVAS_ITEM_GET_CLASS (item)->realize) (item); + + if (group->item.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->flags & GNOME_CANVAS_ITEM_MAPPED) + (* GNOME_CANVAS_ITEM_GET_CLASS (item)->unmap) (item); + + if (item->flags & GNOME_CANVAS_ITEM_REALIZED) + (* GNOME_CANVAS_ITEM_GET_CLASS (item)->unrealize) (item); + + /* Unparent the child */ + + item->parent = NULL; + g_object_unref (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, + LAST_SIGNAL +}; + +static void gnome_canvas_dispose (GObject *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_draw (GtkWidget *widget, + cairo_t *cr); +static gint gnome_canvas_button (GtkWidget *widget, + GdkEventButton *event); +static gint gnome_canvas_motion (GtkWidget *widget, + GdkEventMotion *event); +static gboolean gnome_canvas_key (GtkWidget *widget, + GdkEventKey *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, + cairo_t *cr, + gint x, + gint y, + gint width, + gint height); + +static guint canvas_signals[LAST_SIGNAL]; + +enum { + PROP_0, + PROP_FOCUSED_ITEM, +}; + +G_DEFINE_TYPE ( + GnomeCanvas, + gnome_canvas, + GTK_TYPE_LAYOUT) + +static void +gnome_canvas_paint_rect (GnomeCanvas *canvas, + cairo_t *cr, + gint x0, + gint y0, + gint x1, + gint y1) +{ + GtkWidget *widget; + GtkAllocation allocation; + GtkScrollable *scrollable; + GtkAdjustment *hadjustment; + GtkAdjustment *vadjustment; + gint draw_x1, draw_y1; + gint draw_x2, draw_y2; + gint draw_width, draw_height; + gdouble hadjustment_value; + gdouble vadjustment_value; + + g_return_if_fail (!canvas->need_update); + + widget = GTK_WIDGET (canvas); + gtk_widget_get_allocation (widget, &allocation); + + scrollable = GTK_SCROLLABLE (canvas); + hadjustment = gtk_scrollable_get_hadjustment (scrollable); + vadjustment = gtk_scrollable_get_vadjustment (scrollable); + + hadjustment_value = gtk_adjustment_get_value (hadjustment); + vadjustment_value = gtk_adjustment_get_value (vadjustment); + + draw_x1 = MAX (x0, hadjustment_value - canvas->zoom_xofs); + draw_y1 = MAX (y0, vadjustment_value - canvas->zoom_yofs); + draw_x2 = MIN (draw_x1 + allocation.width, x1); + draw_y2 = MIN (draw_y1 + allocation.height, y1); + + draw_width = draw_x2 - draw_x1; + draw_height = draw_y2 - draw_y1; + + if (draw_width < 1 || draw_height < 1) + return; + + canvas->draw_xofs = draw_x1; + canvas->draw_yofs = draw_y1; + + cairo_save (cr); + + g_signal_emit ( + canvas, canvas_signals[DRAW_BACKGROUND], 0, cr, + draw_x1, draw_y1, draw_width, draw_height); + + cairo_restore (cr); + + if (canvas->root->flags & GNOME_CANVAS_ITEM_VISIBLE) { + cairo_save (cr); + + (* GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->draw) ( + canvas->root, cr, + draw_x1, draw_y1, + draw_width, draw_height); + + cairo_restore (cr); + } +} + +static void +gnome_canvas_get_property (GObject *object, + guint property_id, + GValue *value, + GParamSpec *pspec) +{ + switch (property_id) { + case PROP_FOCUSED_ITEM: + g_value_set_object (value, GNOME_CANVAS (object)->focused_item); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +static void +gnome_canvas_set_property (GObject *object, + guint property_id, + const GValue *value, + GParamSpec *pspec) +{ + switch (property_id) { + case PROP_FOCUSED_ITEM: + GNOME_CANVAS (object)->focused_item = g_value_get_object (value); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +/* Class initialization function for GnomeCanvasClass */ +static void +gnome_canvas_class_init (GnomeCanvasClass *class) +{ + GObjectClass *object_class; + GtkWidgetClass *widget_class; + + object_class = (GObjectClass *) class; + widget_class = (GtkWidgetClass *) class; + + object_class->set_property = gnome_canvas_set_property; + object_class->get_property = gnome_canvas_get_property; + object_class->dispose = gnome_canvas_dispose; + + 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->draw = gnome_canvas_draw; + 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->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; + + class->draw_background = gnome_canvas_draw_background; + class->request_update = gnome_canvas_request_update_real; + + g_object_class_install_property ( + object_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, NULL, + G_TYPE_NONE, 5, + CAIRO_GOBJECT_TYPE_CONTEXT, + G_TYPE_INT, + G_TYPE_INT, + G_TYPE_INT, + G_TYPE_INT); + + gail_canvas_init (); +} + +/* Callback used when the root item of a canvas is destroyed. The user should + * never ever do this, so we panic if this happens. + */ +G_GNUC_NORETURN static void +panic_root_finalized (gpointer data, + GObject *gone_object) +{ + g_error ("Eeeek, root item %p of canvas %p was destroyed!", gone_object, data); +} + +/* Object initialization function for GnomeCanvas */ +static void +gnome_canvas_init (GnomeCanvas *canvas) +{ + GtkLayout *layout; + guint layout_width, layout_height; + + layout = GTK_LAYOUT (canvas); + gtk_layout_get_size (layout, &layout_width, &layout_height); + + gtk_widget_set_can_focus (GTK_WIDGET (canvas), TRUE); + + canvas->need_update = FALSE; + canvas->idle_id = 0; + + canvas->scroll_x1 = 0.0; + canvas->scroll_y1 = 0.0; + canvas->scroll_x2 = layout_width; + canvas->scroll_y2 = layout_height; + + canvas->pick_event.type = GDK_LEAVE_NOTIFY; + canvas->pick_event.crossing.x = 0; + canvas->pick_event.crossing.y = 0; + + gtk_scrollable_set_hadjustment (GTK_SCROLLABLE (canvas), NULL); + gtk_scrollable_set_vadjustment (GTK_SCROLLABLE (canvas), NULL); + + /* 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); + + g_object_weak_ref (G_OBJECT (canvas->root), panic_root_finalized, 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) +{ + if (canvas->grabbed_device != NULL) { + gdk_device_ungrab (canvas->grabbed_device, GDK_CURRENT_TIME); + g_object_unref (canvas->grabbed_device); + canvas->grabbed_device = NULL; + } + + canvas->grabbed_item = NULL; + + remove_idle (canvas); +} + +/* Dispose handler for GnomeCanvas */ +static void +gnome_canvas_dispose (GObject *object) +{ + GnomeCanvas *canvas; + + g_return_if_fail (GNOME_IS_CANVAS (object)); + + /* remember, dispose can be run multiple times! */ + + canvas = GNOME_CANVAS (object); + + if (canvas->root) { + g_object_weak_unref (G_OBJECT (canvas->root), panic_root_finalized, canvas); + g_object_unref (canvas->root); + canvas->root = NULL; + } + + shutdown_transients (canvas); + + /* Chain up to parent's dispose() method. */ + G_OBJECT_CLASS (gnome_canvas_parent_class)->dispose (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)); +} + +/* 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 */ + + GTK_WIDGET_CLASS (gnome_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 */ + + GTK_WIDGET_CLASS (gnome_canvas_parent_class)->unmap (widget); +} + +/* Realize handler for the canvas */ +static void +gnome_canvas_realize (GtkWidget *widget) +{ + GnomeCanvas *canvas; + GtkLayout *layout; + GdkWindow *bin_window; + + g_return_if_fail (GNOME_IS_CANVAS (widget)); + + /* Normal widget realization stuff */ + + GTK_WIDGET_CLASS (gnome_canvas_parent_class)->realize (widget); + + canvas = GNOME_CANVAS (widget); + + layout = GTK_LAYOUT (canvas); + bin_window = gtk_layout_get_bin_window (layout); + + gdk_window_set_events ( + bin_window, + (gdk_window_get_events (bin_window) + | GDK_EXPOSURE_MASK + | GDK_SCROLL_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 */ + + (* 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); + + GTK_WIDGET_CLASS (gnome_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, + gint cx, + gint cy) +{ + GtkWidget *widget; + GtkAllocation allocation; + GtkScrollable *scrollable; + GtkAdjustment *hadjustment; + GtkAdjustment *vadjustment; + guint layout_width, layout_height; + gint scroll_width, scroll_height; + gint right_limit, bottom_limit; + gint old_zoom_xofs, old_zoom_yofs; + gint canvas_width, canvas_height; + + widget = GTK_WIDGET (canvas); + gtk_widget_get_allocation (widget, &allocation); + + scrollable = GTK_SCROLLABLE (canvas); + hadjustment = gtk_scrollable_get_hadjustment (scrollable); + vadjustment = gtk_scrollable_get_vadjustment (scrollable); + + gtk_layout_get_size (GTK_LAYOUT (canvas), &layout_width, &layout_height); + + canvas_width = allocation.width; + canvas_height = allocation.height; + + scroll_width = + floor ((canvas->scroll_x2 - canvas->scroll_x1) + 0.5); + scroll_height = + floor ((canvas->scroll_y2 - canvas->scroll_y1) + 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; + canvas->zoom_xofs = (canvas_width - scroll_width) / 2; + scroll_width = canvas_width; + } 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; + canvas->zoom_yofs = (canvas_height - scroll_height) / 2; + scroll_height = canvas_height; + } 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->flags & GNOME_CANVAS_ITEM_NEED_AFFINE)) { + canvas->root->flags |= GNOME_CANVAS_ITEM_NEED_AFFINE; + gnome_canvas_request_update (canvas); + } + gtk_widget_queue_draw (GTK_WIDGET (canvas)); + } + + if (hadjustment) + gtk_adjustment_set_value (hadjustment, cx); + + if (vadjustment) + gtk_adjustment_set_value (vadjustment, cy); + + if ((scroll_width != (gint) layout_width) + || (scroll_height != (gint) layout_height)) + gtk_layout_set_size (GTK_LAYOUT (canvas), scroll_width, scroll_height); +} + +/* Size allocation handler for the canvas */ +static void +gnome_canvas_size_allocate (GtkWidget *widget, + GtkAllocation *allocation) +{ + GtkScrollable *scrollable; + GtkAdjustment *hadjustment; + GtkAdjustment *vadjustment; + + g_return_if_fail (GNOME_IS_CANVAS (widget)); + g_return_if_fail (allocation != NULL); + + GTK_WIDGET_CLASS (gnome_canvas_parent_class)-> + size_allocate (widget, allocation); + + scrollable = GTK_SCROLLABLE (widget); + hadjustment = gtk_scrollable_get_hadjustment (scrollable); + vadjustment = gtk_scrollable_get_vadjustment (scrollable); + + /* Recenter the view, if appropriate */ + + g_object_freeze_notify (G_OBJECT (hadjustment)); + g_object_freeze_notify (G_OBJECT (vadjustment)); + + gtk_adjustment_set_page_size (hadjustment, allocation->width); + gtk_adjustment_set_page_increment (hadjustment, allocation->width / 2); + + gtk_adjustment_set_page_size (vadjustment, allocation->height); + gtk_adjustment_set_page_increment (vadjustment, allocation->height / 2); + + scroll_to ( + GNOME_CANVAS (widget), + gtk_adjustment_get_value (hadjustment), + gtk_adjustment_get_value (vadjustment)); + + g_object_thaw_notify (G_OBJECT (hadjustment)); + g_object_thaw_notify (G_OBJECT (vadjustment)); +} + +static gboolean +gnome_canvas_draw (GtkWidget *widget, + cairo_t *cr) +{ + GnomeCanvas *canvas = GNOME_CANVAS (widget); + cairo_rectangle_int_t rect; + GtkLayout *layout; + GtkAdjustment *hadjustment; + GtkAdjustment *vadjustment; + gdouble hadjustment_value; + gdouble vadjustment_value; + + layout = GTK_LAYOUT (canvas); + hadjustment = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (layout)); + vadjustment = gtk_scrollable_get_vadjustment (GTK_SCROLLABLE (layout)); + + hadjustment_value = gtk_adjustment_get_value (hadjustment); + vadjustment_value = gtk_adjustment_get_value (vadjustment); + + gdk_cairo_get_clip_rectangle (cr, &rect); + + if (canvas->need_update) { + cairo_matrix_t w2c; + + /* We start updating root with w2c matrix */ + gnome_canvas_w2c_matrix (canvas, &w2c); + + gnome_canvas_item_invoke_update (canvas->root, &w2c, 0); + + canvas->need_update = FALSE; + } + + cairo_save (cr); + cairo_translate ( + cr, + -canvas->zoom_xofs + rect.x, + -canvas->zoom_yofs + rect.y); + + rect.x += hadjustment_value; + rect.y += vadjustment_value; + + /* No pending updates, draw exposed area immediately */ + gnome_canvas_paint_rect ( + canvas, cr, + rect.x, rect.y, + rect.x + rect.width, + rect.y + rect.height); + cairo_restore (cr); + + /* And call expose on parent container class */ + GTK_WIDGET_CLASS (gnome_canvas_parent_class)->draw (widget, cr); + + return FALSE; +} + +/* Emits an event for an item in the canvas, be it the current item, grabbed + * item, or focused item, as appropriate. + */ + +static gint +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 (item); + + g_signal_emit ( + item, item_signals[ITEM_EVENT], 0, + ev, &finished); + + parent = item->parent; + g_object_unref (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 gint +pick_current_item (GnomeCanvas *canvas, + GdkEvent *event) +{ + gint button_down; + gdouble x, y; + gint cx, cy; + gint 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 = (gint) (x + 0.5); + cy = (gint) (y + 0.5); + + /* world coords */ + + x = canvas->scroll_x1 + x; + y = canvas->scroll_y1 + y; + + /* find the closest item */ + + if (canvas->root->flags & GNOME_CANVAS_ITEM_VISIBLE) + canvas->new_current_item = + gnome_canvas_item_invoke_point ( + canvas->root, x, y, cx, cy); + 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; + GtkLayout *layout; + GdkWindow *bin_window; + gint mask; + gint 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); + + layout = GTK_LAYOUT (canvas); + bin_window = gtk_layout_get_bin_window (layout); + + /* + * dispatch normally regardless of the event's window if an item has + * has a pointer grab in effect + */ + if (!canvas->grabbed_item && event->window != 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_warn_if_reached (); + } + + return retval; +} + +/* Motion event handler for the canvas */ +static gint +gnome_canvas_motion (GtkWidget *widget, + GdkEventMotion *event) +{ + GnomeCanvas *canvas; + GtkLayout *layout; + GdkWindow *bin_window; + + g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE); + g_return_val_if_fail (event != NULL, FALSE); + + canvas = GNOME_CANVAS (widget); + + layout = GTK_LAYOUT (widget); + bin_window = gtk_layout_get_bin_window (layout); + + if (event->window != 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 (gnome_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_warn_if_reached (); + + return FALSE; + } else + return TRUE; +} + +/* Crossing event handler for the canvas */ +static gint +gnome_canvas_crossing (GtkWidget *widget, + GdkEventCrossing *event) +{ + GnomeCanvas *canvas; + GtkLayout *layout; + GdkWindow *bin_window; + + g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE); + g_return_val_if_fail (event != NULL, FALSE); + + canvas = GNOME_CANVAS (widget); + + layout = GTK_LAYOUT (canvas); + bin_window = gtk_layout_get_bin_window (layout); + + if (event->window != bin_window) + return FALSE; + + /* XXX Detect and disregard synthesized crossing events generated + * by synth_crossing() in gtkwidget.c. The pointer coordinates + * are invalid and pick_current_item() relies on them. */ + if (event->x == 0 && event->y == 0 && + event->x_root == 0 && event->y_root == 0) + 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; + + /* XXX Can't access flags directly anymore, but is it really needed? + * If so, could we call gtk_widget_send_focus_change() instead? */ +#if 0 + GTK_WIDGET_SET_FLAGS (widget, GTK_HAS_FOCUS); +#endif + + 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; + + /* XXX Can't access flags directly anymore, but is it really needed? + * If so, could we call gtk_widget_send_focus_change() instead? */ +#if 0 + GTK_WIDGET_UNSET_FLAGS (widget, GTK_HAS_FOCUS); +#endif + + canvas = GNOME_CANVAS (widget); + + if (canvas->focused_item) + return emit_event (canvas, (GdkEvent *) event); + else + return FALSE; +} + +static void +gnome_canvas_draw_background (GnomeCanvas *canvas, + cairo_t *cr, + gint x, + gint y, + gint width, + gint height) +{ + GtkStyle *style; + + style = gtk_widget_get_style (GTK_WIDGET (canvas)); + + cairo_save (cr); + gdk_cairo_set_source_color (cr, &style->bg[GTK_STATE_NORMAL]); + cairo_paint (cr); + cairo_restore (cr); +} + +static void +do_update (GnomeCanvas *canvas) +{ + /* Cause the update if necessary */ + +update_again: + if (canvas->need_update) { + cairo_matrix_t w2c; + + /* We start updating root with w2c matrix */ + gnome_canvas_w2c_matrix (canvas, &w2c); + + gnome_canvas_item_invoke_update (canvas->root, &w2c, 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; + } +} + +/* Idle handler for the canvas. It deals with pending updates and redraws. */ +static gboolean +idle_handler (gpointer data) +{ + GnomeCanvas *canvas; + + canvas = GNOME_CANVAS (data); + + do_update (canvas); + + /* Reset idle id */ + canvas->idle_id = 0; + + return FALSE; +} + +/* Convenience function to add an idle handler to a canvas */ +static void +add_idle (GnomeCanvas *canvas) +{ + g_return_if_fail (canvas->need_update); + + 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, + gdouble x1, + gdouble y1, + gdouble x2, + gdouble y2) +{ + GtkScrollable *scrollable; + GtkAdjustment *hadjustment; + GtkAdjustment *vadjustment; + gdouble hadjustment_value; + gdouble vadjustment_value; + gdouble wxofs, wyofs; + gint xofs, yofs; + + g_return_if_fail (GNOME_IS_CANVAS (canvas)); + + scrollable = GTK_SCROLLABLE (canvas); + hadjustment = gtk_scrollable_get_hadjustment (scrollable); + vadjustment = gtk_scrollable_get_vadjustment (scrollable); + + hadjustment_value = gtk_adjustment_get_value (hadjustment); + vadjustment_value = gtk_adjustment_get_value (vadjustment); + + /* + * Set the new scrolling region. If possible, do not move the + * visible contents of the canvas. + */ + + gnome_canvas_c2w ( + canvas, + hadjustment_value + canvas->zoom_xofs, + vadjustment_value + 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.class)->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, + gdouble *x1, + gdouble *y1, + gdouble *x2, + gdouble *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_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, + gint cx, + gint 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, + gint *cx, + gint *cy) +{ + GtkAdjustment *adjustment; + GtkScrollable *scrollable; + + g_return_if_fail (GNOME_IS_CANVAS (canvas)); + + scrollable = GTK_SCROLLABLE (canvas); + + if (cx) { + adjustment = gtk_scrollable_get_hadjustment (scrollable); + *cx = (gint) gtk_adjustment_get_value (adjustment); + } + + if (cy) { + adjustment = gtk_scrollable_get_vadjustment (scrollable); + *cy = (gint) gtk_adjustment_get_value (adjustment); + } +} + +/** + * 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, + gdouble x, + gdouble y) +{ + gint cx, cy; + + g_return_val_if_fail (GNOME_IS_CANVAS (canvas), NULL); + + gnome_canvas_w2c (canvas, x, y, &cx, &cy); + + return gnome_canvas_item_invoke_point (canvas->root, x, y, cx, cy); +} + +/* 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_get_mapped ((GtkWidget *) canvas)) + add_idle (canvas); +} + +static inline void +get_visible_rect (GnomeCanvas *canvas, + GdkRectangle *visible) +{ + GtkAllocation allocation; + GtkScrollable *scrollable; + GtkAdjustment *hadjustment; + GtkAdjustment *vadjustment; + gdouble hadjustment_value; + gdouble vadjustment_value; + + gtk_widget_get_allocation (GTK_WIDGET (canvas), &allocation); + + scrollable = GTK_SCROLLABLE (canvas); + hadjustment = gtk_scrollable_get_hadjustment (scrollable); + vadjustment = gtk_scrollable_get_vadjustment (scrollable); + + hadjustment_value = gtk_adjustment_get_value (hadjustment); + vadjustment_value = gtk_adjustment_get_value (vadjustment); + + visible->x = hadjustment_value - canvas->zoom_xofs; + visible->y = vadjustment_value - canvas->zoom_yofs; + visible->width = allocation.width; + visible->height = allocation.height; +} + +/** + * 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. 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, + gint x1, + gint y1, + gint x2, + gint y2) +{ + GdkRectangle area, clip; + + g_return_if_fail (GNOME_IS_CANVAS (canvas)); + + if (!gtk_widget_is_drawable (GTK_WIDGET (canvas)) || (x1 >= x2) || (y1 >= y2)) + return; + + area.x = x1; + area.y = y1; + area.width = x2 - x1 + 1; + area.height = y2 - y1 + 1; + + get_visible_rect (canvas, &clip); + if (!gdk_rectangle_intersect (&area, &clip, &area)) + return; + + gdk_window_invalidate_rect ( + gtk_layout_get_bin_window (GTK_LAYOUT (canvas)), + &area, FALSE); +} + +/** + * gnome_canvas_w2c_matrix: + * @canvas: A canvas. + * @matrix: (out): matrix to initialize + * + * Gets the transformtion matrix that converts from world coordinates to canvas + * pixel coordinates. + **/ +void +gnome_canvas_w2c_matrix (GnomeCanvas *canvas, + cairo_matrix_t *matrix) +{ + g_return_if_fail (GNOME_IS_CANVAS (canvas)); + g_return_if_fail (matrix != NULL); + + cairo_matrix_init_translate ( + matrix, -canvas->scroll_x1, -canvas->scroll_y1); +} + +/** + * gnome_canvas_c2w_matrix: + * @canvas: A canvas. + * @matrix: (out): matrix to initialize + * + * Gets the transformtion matrix that converts from canvas pixel coordinates to + * world coordinates. + **/ +void +gnome_canvas_c2w_matrix (GnomeCanvas *canvas, + cairo_matrix_t *matrix) +{ + g_return_if_fail (GNOME_IS_CANVAS (canvas)); + g_return_if_fail (matrix != NULL); + + cairo_matrix_init_translate ( + matrix, canvas->scroll_x1, canvas->scroll_y1); +} + +/** + * 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, + gdouble wx, + gdouble wy, + gint *cx, + gint *cy) +{ + cairo_matrix_t w2c; + + g_return_if_fail (GNOME_IS_CANVAS (canvas)); + + gnome_canvas_w2c_matrix (canvas, &w2c); + cairo_matrix_transform_point (&w2c, &wx, &wy); + + if (cx) + *cx = floor (wx + 0.5); + if (cy) + *cy = floor (wy + 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, + gdouble wx, + gdouble wy, + gdouble *cx, + gdouble *cy) +{ + cairo_matrix_t w2c; + + g_return_if_fail (GNOME_IS_CANVAS (canvas)); + + gnome_canvas_w2c_matrix (canvas, &w2c); + cairo_matrix_transform_point (&w2c, &wx, &wy); + + if (cx) + *cx = wx; + if (cy) + *cy = wy; +} + +/** + * 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, + gint cx, + gint cy, + gdouble *wx, + gdouble *wy) +{ + cairo_matrix_t c2w; + gdouble x, y; + + g_return_if_fail (GNOME_IS_CANVAS (canvas)); + + x = cx; + y = cy; + gnome_canvas_c2w_matrix (canvas, &c2w); + cairo_matrix_transform_point (&c2w, &x, &y); + + if (wx) + *wx = x; + if (wy) + *wy = 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, + gdouble winx, + gdouble winy, + gdouble *worldx, + gdouble *worldy) +{ + g_return_if_fail (GNOME_IS_CANVAS (canvas)); + + if (worldx) + *worldx = canvas->scroll_x1 + (winx - canvas->zoom_xofs); + + if (worldy) + *worldy = canvas->scroll_y1 + (winy - canvas->zoom_yofs); +} + +/** + * 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, + gdouble worldx, + gdouble worldy, + gdouble *winx, + gdouble *winy) +{ + g_return_if_fail (GNOME_IS_CANVAS (canvas)); + + if (winx) + *winx = (worldx - canvas->scroll_x1) + canvas->zoom_xofs; + + if (winy) + *winy = (worldy - canvas->scroll_y1) + canvas->zoom_yofs; +} + +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; + + 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, NULL, + G_TYPE_BOOLEAN, 1, + GDK_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE); + + gobject_class->dispose = gnome_canvas_item_dispose; + + class->update = gnome_canvas_item_update; + 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->dispose = gnome_canvas_item_dispose_item; + class->draw = gnome_canvas_item_draw; + class->point = gnome_canvas_item_point; + class->bounds = gnome_canvas_item_bounds; + class->event = gnome_canvas_item_event; +} |