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Diffstat (limited to 'eel/eel-canvas.c')
| -rw-r--r-- | eel/eel-canvas.c | 4213 |
1 files changed, 4213 insertions, 0 deletions
diff --git a/eel/eel-canvas.c b/eel/eel-canvas.c new file mode 100644 index 00000000..afa038f0 --- /dev/null +++ b/eel/eel-canvas.c @@ -0,0 +1,4213 @@ +/* -*- 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 Mate Library. + * + * The Mate 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 Mate 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 Mate 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@ + */ +/* + * EelCanvas widget - Tk-like canvas widget for Mate + * + * EelCanvas 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 <[email protected]> + * Raph Levien <[email protected]> + */ + +/* + * TO-DO list for the canvas: + * + * - Allow to specify whether EelCanvasImage sizes are in units or pixels (scale or don't scale). + * + * - Implement a flag for eel_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 *eel_canvas_gimme_all_items_contained_in_this_area (EelCanvas *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 EelCanvasEllipse). + * + * - Sane font handling API. + * + * - Get_arg methods for items: + * - How to fetch the outline width and know whether it is in pixels or units? + */ + +#include <config.h> + +#include <math.h> +#include <string.h> +#include <stdio.h> +#include <gdk/gdkprivate.h> +#include <gtk/gtk.h> +#include "eel-canvas.h" +#include "eel-i18n.h" + +#include "eel-marshal.h" + +static void eel_canvas_request_update (EelCanvas *canvas); +static void group_add (EelCanvasGroup *group, + EelCanvasItem *item); +static void group_remove (EelCanvasGroup *group, + EelCanvasItem *item); +static void redraw_and_repick_if_mapped (EelCanvasItem *item); + +/*** EelCanvasItem ***/ + +/* Some convenience stuff */ +#define GCI_UPDATE_MASK (EEL_CANVAS_UPDATE_REQUESTED | EEL_CANVAS_UPDATE_DEEP) +#define GCI_EPSILON 1e-18 + +enum +{ + ITEM_PROP_0, + ITEM_PROP_PARENT, + ITEM_PROP_VISIBLE +}; + +enum +{ + ITEM_EVENT, + ITEM_LAST_SIGNAL +}; + +static void eel_canvas_item_class_init (EelCanvasItemClass *klass); +static void eel_canvas_item_init (EelCanvasItem *item); +static int emit_event (EelCanvas *canvas, GdkEvent *event); + +static guint item_signals[ITEM_LAST_SIGNAL]; + +static GtkObjectClass *item_parent_class; + +static gpointer accessible_item_parent_class; +static gpointer accessible_parent_class; + + +/** + * eel_canvas_item_get_type: + * + * Registers the &EelCanvasItem class if necessary, and returns the type ID + * associated to it. + * + * Return value: The type ID of the &EelCanvasItem class. + **/ +GType +eel_canvas_item_get_type (void) +{ + static GType canvas_item_type = 0; + + if (!canvas_item_type) + { + static const GTypeInfo canvas_item_info = + { + sizeof (EelCanvasItemClass), + (GBaseInitFunc) NULL, + (GBaseFinalizeFunc) NULL, + (GClassInitFunc) eel_canvas_item_class_init, + NULL, /* class_finalize */ + NULL, /* class_data */ + sizeof (EelCanvasItem), + 0, /* n_preallocs */ + (GInstanceInitFunc) eel_canvas_item_init + }; + + canvas_item_type = g_type_register_static (gtk_object_get_type (), + "EelCanvasItem", + &canvas_item_info, + 0); + } + + return canvas_item_type; +} + +/* Object initialization function for EelCanvasItem */ +static void +eel_canvas_item_init (EelCanvasItem *item) +{ + item->flags |= EEL_CANVAS_ITEM_VISIBLE; +} + +/** + * eel_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 + * eel_canvas_rect_get_type(). The list of object arguments/value pairs is + * used to configure the item. + * + * Return value: The newly-created item. + **/ +EelCanvasItem * +eel_canvas_item_new (EelCanvasGroup *parent, GType type, const gchar *first_arg_name, ...) +{ + EelCanvasItem *item; + va_list args; + + g_return_val_if_fail (EEL_IS_CANVAS_GROUP (parent), NULL); + g_return_val_if_fail (g_type_is_a (type, eel_canvas_item_get_type ()), NULL); + + item = EEL_CANVAS_ITEM (g_object_new (type, NULL)); + + va_start (args, first_arg_name); + eel_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 (EelCanvasItem *item) +{ + group_add (EEL_CANVAS_GROUP (item->parent), item); + + redraw_and_repick_if_mapped (item); +} + +/* Set_property handler for canvas items */ +static void +eel_canvas_item_set_property (GObject *gobject, guint param_id, + const GValue *value, GParamSpec *pspec) +{ + EelCanvasItem *item; + + g_return_if_fail (EEL_IS_CANVAS_ITEM (gobject)); + + item = EEL_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 = EEL_CANVAS_ITEM (g_value_get_object (value)); + item->canvas = item->parent->canvas; + item_post_create_setup (item); + } + break; + case ITEM_PROP_VISIBLE: + if (g_value_get_boolean (value)) + { + eel_canvas_item_show (item); + } + else + { + eel_canvas_item_hide (item); + } + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec); + break; + } +} + +/* Get_property handler for canvas items */ +static void +eel_canvas_item_get_property (GObject *gobject, guint param_id, + GValue *value, GParamSpec *pspec) +{ + EelCanvasItem *item; + + g_return_if_fail (EEL_IS_CANVAS_ITEM (gobject)); + + item = EEL_CANVAS_ITEM (gobject); + + switch (param_id) + { + case ITEM_PROP_VISIBLE: + g_value_set_boolean (value, item->flags & EEL_CANVAS_ITEM_VISIBLE); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec); + break; + } +} + +/** + * eel_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 +eel_canvas_item_construct (EelCanvasItem *item, EelCanvasGroup *parent, + const gchar *first_arg_name, va_list args) +{ + g_return_if_fail (EEL_IS_CANVAS_GROUP (parent)); + g_return_if_fail (EEL_IS_CANVAS_ITEM (item)); + + item->parent = EEL_CANVAS_ITEM (parent); + item->canvas = item->parent->canvas; + + g_object_set_valist (G_OBJECT (item), first_arg_name, args); + + item_post_create_setup (item); +} + + +static void +redraw_and_repick_if_mapped (EelCanvasItem *item) +{ + if (item->flags & EEL_CANVAS_ITEM_MAPPED) + { + eel_canvas_item_request_redraw (item); + item->canvas->need_repick = TRUE; + } +} + +/* Dispose handler for canvas items */ +static void +eel_canvas_item_dispose (GObject *object) +{ + EelCanvasItem *item; + + g_return_if_fail (EEL_IS_CANVAS_ITEM (object)); + + item = EEL_CANVAS_ITEM (object); + + if (item->canvas) + { + eel_canvas_item_request_redraw (item); + + /* Make the canvas forget about us */ + + if (item == item->canvas->current_item) + { + item->canvas->current_item = NULL; + item->canvas->need_repick = TRUE; + } + + if (item == item->canvas->new_current_item) + { + item->canvas->new_current_item = NULL; + item->canvas->need_repick = TRUE; + } + + if (item == item->canvas->grabbed_item) + { + GdkDisplay *display = gtk_widget_get_display (GTK_WIDGET (item->canvas)); + item->canvas->grabbed_item = NULL; + gdk_display_pointer_ungrab (display, GDK_CURRENT_TIME); + } + + if (item == item->canvas->focused_item) + item->canvas->focused_item = NULL; + + /* Normal destroy stuff */ + + if (item->flags & EEL_CANVAS_ITEM_MAPPED) + (* EEL_CANVAS_ITEM_GET_CLASS (item)->unmap) (item); + + if (item->flags & EEL_CANVAS_ITEM_REALIZED) + (* EEL_CANVAS_ITEM_GET_CLASS (item)->unrealize) (item); + + if (item->parent) + group_remove (EEL_CANVAS_GROUP (item->parent), item); + + item->canvas = NULL; + } + + G_OBJECT_CLASS (item_parent_class)->dispose (object); +} + + +/* Realize handler for canvas items */ +static void +eel_canvas_item_realize (EelCanvasItem *item) +{ + if (item->parent && !(item->parent->flags & EEL_CANVAS_ITEM_REALIZED)) + (* EEL_CANVAS_ITEM_GET_CLASS (item->parent)->realize) (item->parent); + + if (item->parent == NULL && !gtk_widget_get_realized (GTK_WIDGET (item->canvas))) + gtk_widget_realize (GTK_WIDGET (item->canvas)); + + item->flags |= EEL_CANVAS_ITEM_REALIZED; + + eel_canvas_item_request_update (item); +} + +/* Unrealize handler for canvas items */ +static void +eel_canvas_item_unrealize (EelCanvasItem *item) +{ + if (item->flags & EEL_CANVAS_ITEM_MAPPED) + (* EEL_CANVAS_ITEM_GET_CLASS (item)->unmap) (item); + + item->flags &= ~(EEL_CANVAS_ITEM_REALIZED); +} + +/* Map handler for canvas items */ +static void +eel_canvas_item_map (EelCanvasItem *item) +{ + item->flags |= EEL_CANVAS_ITEM_MAPPED; +} + +/* Unmap handler for canvas items */ +static void +eel_canvas_item_unmap (EelCanvasItem *item) +{ + item->flags &= ~(EEL_CANVAS_ITEM_MAPPED); +} + +/* Update handler for canvas items */ +static void +eel_canvas_item_update (EelCanvasItem *item, double i2w_dx, double i2w_dy, int flags) +{ + item->flags &= ~(EEL_CANVAS_ITEM_NEED_UPDATE); + item->flags &= ~(EEL_CANVAS_ITEM_NEED_DEEP_UPDATE); +} + +/* + * 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 +eel_canvas_item_invoke_update (EelCanvasItem *item, + double i2w_dx, + double i2w_dy, + int flags) +{ + int child_flags; + + child_flags = flags; + + /* apply object flags to child flags */ + child_flags &= ~EEL_CANVAS_UPDATE_REQUESTED; + + if (item->flags & EEL_CANVAS_ITEM_NEED_UPDATE) + child_flags |= EEL_CANVAS_UPDATE_REQUESTED; + + if (item->flags & EEL_CANVAS_ITEM_NEED_DEEP_UPDATE) + child_flags |= EEL_CANVAS_UPDATE_DEEP; + + if (child_flags & GCI_UPDATE_MASK) + { + if (EEL_CANVAS_ITEM_GET_CLASS (item)->update) + EEL_CANVAS_ITEM_GET_CLASS (item)->update (item, i2w_dx, i2w_dy, child_flags); + } + + /* If this fail you probably forgot to chain up to + * EelCanvasItem::update from a derived class */ + g_return_if_fail (!(item->flags & EEL_CANVAS_ITEM_NEED_UPDATE)); +} + +/* + * This routine invokes the point method of the item. + * The arguments x, y should be in the parent item local coordinates. + */ + +static double +eel_canvas_item_invoke_point (EelCanvasItem *item, double x, double y, int cx, int cy, EelCanvasItem **actual_item) +{ + /* Calculate x & y in item local coordinates */ + + if (EEL_CANVAS_ITEM_GET_CLASS (item)->point) + return EEL_CANVAS_ITEM_GET_CLASS (item)->point (item, x, y, cx, cy, actual_item); + + return 1e18; +} + +/** + * eel_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 +eel_canvas_item_set (EelCanvasItem *item, const gchar *first_arg_name, ...) +{ + va_list args; + + va_start (args, first_arg_name); + eel_canvas_item_set_valist (item, first_arg_name, args); + va_end (args); +} + + +/** + * eel_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 +eel_canvas_item_set_valist (EelCanvasItem *item, const gchar *first_arg_name, va_list args) +{ + g_return_if_fail (EEL_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 */ + eel_canvas_item_request_redraw (item); +#endif + + item->canvas->need_repick = TRUE; +} + + +/** + * eel_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 +eel_canvas_item_move (EelCanvasItem *item, double dx, double dy) +{ + g_return_if_fail (item != NULL); + g_return_if_fail (EEL_IS_CANVAS_ITEM (item)); + + if (!EEL_CANVAS_ITEM_GET_CLASS (item)->translate) + { + g_warning ("Item type %s does not implement translate method.\n", + g_type_name (G_OBJECT_TYPE (item))); + return; + } + + (* EEL_CANVAS_ITEM_GET_CLASS (item)->translate) (item, dx, dy); + + if (item->flags & EEL_CANVAS_ITEM_MAPPED) + item->canvas->need_repick = TRUE; + + if (!(item->flags & EEL_CANVAS_ITEM_NEED_DEEP_UPDATE)) + { + item->flags |= EEL_CANVAS_ITEM_NEED_DEEP_UPDATE; + if (item->parent != NULL) + eel_canvas_item_request_update (item->parent); + else + eel_canvas_request_update (item->canvas); + } + +} + +/* 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) +{ + EelCanvasGroup *parent; + + if (link == before) + return FALSE; + + parent = EEL_CANVAS_GROUP (EEL_CANVAS_ITEM (link->data)->parent); + + if (before == NULL) + { + if (link == parent->item_list) + return FALSE; + + link->prev->next = link->next; + + if (link->next) + link->next->prev = link->prev; + else + parent->item_list_end = link->prev; + + link->prev = before; + link->next = parent->item_list; + link->next->prev = link; + parent->item_list = link; + } + else + { + if ((link == parent->item_list_end) && (before == parent->item_list_end->prev)) + return FALSE; + + if (link->next) + link->next->prev = link->prev; + + if (link->prev) + link->prev->next = link->next; + else + { + parent->item_list = link->next; + parent->item_list->prev = NULL; + } + + link->prev = before; + link->next = before->next; + + link->prev->next = link; + + if (link->next) + link->next->prev = link; + else + parent->item_list_end = link; + } + return TRUE; +} + + +/** + * eel_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 +eel_canvas_item_raise (EelCanvasItem *item, int positions) +{ + GList *link, *before; + EelCanvasGroup *parent; + + g_return_if_fail (EEL_IS_CANVAS_ITEM (item)); + g_return_if_fail (positions >= 0); + + if (!item->parent || positions == 0) + return; + + parent = EEL_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_and_repick_if_mapped (item); + } +} + + +/** + * eel_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 +eel_canvas_item_lower (EelCanvasItem *item, int positions) +{ + GList *link, *before; + EelCanvasGroup *parent; + + g_return_if_fail (EEL_IS_CANVAS_ITEM (item)); + g_return_if_fail (positions >= 1); + + if (!item->parent || positions == 0) + return; + + parent = EEL_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_and_repick_if_mapped (item); + } +} + + +/** + * eel_canvas_item_raise_to_top: + * @item: A canvas item. + * + * Raises an item to the top of its parent's stack. + **/ +void +eel_canvas_item_raise_to_top (EelCanvasItem *item) +{ + GList *link; + EelCanvasGroup *parent; + + g_return_if_fail (EEL_IS_CANVAS_ITEM (item)); + + if (!item->parent) + return; + + parent = EEL_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_and_repick_if_mapped (item); + } +} + + +/** + * eel_canvas_item_lower_to_bottom: + * @item: A canvas item. + * + * Lowers an item to the bottom of its parent's stack. + **/ +void +eel_canvas_item_lower_to_bottom (EelCanvasItem *item) +{ + GList *link; + EelCanvasGroup *parent; + + g_return_if_fail (EEL_IS_CANVAS_ITEM (item)); + + if (!item->parent) + return; + + parent = EEL_CANVAS_GROUP (item->parent); + link = g_list_find (parent->item_list, item); + g_assert (link != NULL); + + if (put_item_after (link, NULL)) + { + redraw_and_repick_if_mapped (item); + } +} + +/** + * eel_canvas_item_send_behind: + * @item: A canvas item. + * @behind_item: The canvas item to put item behind, or NULL + * + * Moves item to a in the position in the stacking order so that + * it is placed immediately below behind_item, or at the top if + * behind_item is NULL. + **/ +void +eel_canvas_item_send_behind (EelCanvasItem *item, + EelCanvasItem *behind_item) +{ + GList *item_list; + int item_position, behind_position; + + g_return_if_fail (EEL_IS_CANVAS_ITEM (item)); + + if (behind_item == NULL) + { + eel_canvas_item_raise_to_top (item); + return; + } + + g_return_if_fail (EEL_IS_CANVAS_ITEM (behind_item)); + g_return_if_fail (item->parent == behind_item->parent); + + item_list = EEL_CANVAS_GROUP (item->parent)->item_list; + + item_position = g_list_index (item_list, item); + g_assert (item_position != -1); + behind_position = g_list_index (item_list, behind_item); + g_assert (behind_position != -1); + g_assert (item_position != behind_position); + + if (item_position == behind_position - 1) + { + return; + } + + if (item_position < behind_position) + { + eel_canvas_item_raise (item, (behind_position - 1) - item_position); + } + else + { + eel_canvas_item_lower (item, item_position - behind_position); + } +} + +/** + * eel_canvas_item_show: + * @item: A canvas item. + * + * Shows a canvas item. If the item was already shown, then no action is taken. + **/ +void +eel_canvas_item_show (EelCanvasItem *item) +{ + g_return_if_fail (EEL_IS_CANVAS_ITEM (item)); + + if (!(item->flags & EEL_CANVAS_ITEM_VISIBLE)) + { + item->flags |= EEL_CANVAS_ITEM_VISIBLE; + + if (!(item->flags & EEL_CANVAS_ITEM_REALIZED)) + (* EEL_CANVAS_ITEM_GET_CLASS (item)->realize) (item); + + if (item->parent != NULL) + { + if (!(item->flags & EEL_CANVAS_ITEM_MAPPED) && + item->parent->flags & EEL_CANVAS_ITEM_MAPPED) + (* EEL_CANVAS_ITEM_GET_CLASS (item)->map) (item); + } + else + { + if (!(item->flags & EEL_CANVAS_ITEM_MAPPED) && + gtk_widget_get_mapped (GTK_WIDGET (item->canvas))) + (* EEL_CANVAS_ITEM_GET_CLASS (item)->map) (item); + } + + redraw_and_repick_if_mapped (item); + } +} + + +/** + * eel_canvas_item_hide: + * @item: A canvas item. + * + * Hides a canvas item. If the item was already hidden, then no action is + * taken. + **/ +void +eel_canvas_item_hide (EelCanvasItem *item) +{ + g_return_if_fail (EEL_IS_CANVAS_ITEM (item)); + + if (item->flags & EEL_CANVAS_ITEM_VISIBLE) + { + item->flags &= ~EEL_CANVAS_ITEM_VISIBLE; + + redraw_and_repick_if_mapped (item); + + if (item->flags & EEL_CANVAS_ITEM_MAPPED) + (* EEL_CANVAS_ITEM_GET_CLASS (item)->unmap) (item); + + /* No need to unrealize when we just want to hide */ + } +} + + +/** + * eel_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 eel_canvas_item_hide(), then it + * returns %GDK_GRAB_NOT_VIEWABLE. Else, it returns the result of calling + * gdk_pointer_grab(). + **/ +int +eel_canvas_item_grab (EelCanvasItem *item, guint event_mask, GdkCursor *cursor, guint32 etime) +{ + int retval; + + g_return_val_if_fail (EEL_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); + + if (item->canvas->grabbed_item) + return GDK_GRAB_ALREADY_GRABBED; + + if (!(item->flags & EEL_CANVAS_ITEM_MAPPED)) + return GDK_GRAB_NOT_VIEWABLE; + + retval = gdk_pointer_grab (gtk_layout_get_bin_window (&item->canvas->layout), + 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; +} + + +/** + * eel_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 +eel_canvas_item_ungrab (EelCanvasItem *item, guint32 etime) +{ + GdkDisplay *display; + + g_return_if_fail (EEL_IS_CANVAS_ITEM (item)); + + if (item->canvas->grabbed_item != item) + return; + + display = gtk_widget_get_display (GTK_WIDGET (item->canvas)); + item->canvas->grabbed_item = NULL; + gdk_display_pointer_ungrab (display, etime); +} + + +/** + * eel_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 +eel_canvas_item_w2i (EelCanvasItem *item, double *x, double *y) +{ + g_return_if_fail (EEL_IS_CANVAS_ITEM (item)); + g_return_if_fail (x != NULL); + g_return_if_fail (y != NULL); + + item = item->parent; + while (item) + { + if (EEL_IS_CANVAS_GROUP (item)) + { + *x -= EEL_CANVAS_GROUP (item)->xpos; + *y -= EEL_CANVAS_GROUP (item)->ypos; + } + + item = item->parent; + } +} + + +/** + * eel_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 +eel_canvas_item_i2w (EelCanvasItem *item, double *x, double *y) +{ + g_return_if_fail (EEL_IS_CANVAS_ITEM (item)); + g_return_if_fail (x != NULL); + g_return_if_fail (y != NULL); + + item = item->parent; + while (item) + { + if (EEL_IS_CANVAS_GROUP (item)) + { + *x += EEL_CANVAS_GROUP (item)->xpos; + *y += EEL_CANVAS_GROUP (item)->ypos; + } + + item = item->parent; + } +} + +/* Returns whether the item is an inferior of or is equal to the parent. */ +static int +is_descendant (EelCanvasItem *item, EelCanvasItem *parent) +{ + for (; item; item = item->parent) + if (item == parent) + return TRUE; + + return FALSE; +} + +/** + * eel_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 +eel_canvas_item_reparent (EelCanvasItem *item, EelCanvasGroup *new_group) +{ + g_return_if_fail (EEL_IS_CANVAS_ITEM (item)); + g_return_if_fail (EEL_IS_CANVAS_GROUP (new_group)); + + /* Both items need to be in the same canvas */ + g_return_if_fail (item->canvas == EEL_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 (EEL_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 */ + + eel_canvas_item_request_redraw (item); + + group_remove (EEL_CANVAS_GROUP (item->parent), item); + item->parent = EEL_CANVAS_ITEM (new_group); + /* item->canvas is unchanged. */ + group_add (new_group, item); + + /* Redraw and repick */ + + redraw_and_repick_if_mapped (item); + + g_object_unref (G_OBJECT (item)); +} + +/** + * eel_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 +eel_canvas_item_grab_focus (EelCanvasItem *item) +{ + EelCanvasItem *focused_item; + GdkEvent ev; + + g_return_if_fail (EEL_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) + { + ev.focus_change.type = GDK_FOCUS_CHANGE; + ev.focus_change.window = gtk_layout_get_bin_window (GTK_LAYOUT (item->canvas)); + 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_get_bin_window (GTK_LAYOUT (item->canvas)); + ev.focus_change.send_event = FALSE; + ev.focus_change.in = TRUE; + + emit_event (item->canvas, &ev); + } +} + + +/** + * eel_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 +eel_canvas_item_get_bounds (EelCanvasItem *item, double *x1, double *y1, double *x2, double *y2) +{ + double tx1, ty1, tx2, ty2; + + g_return_if_fail (EEL_IS_CANVAS_ITEM (item)); + + tx1 = ty1 = tx2 = ty2 = 0.0; + + /* Get the item's bounds in its coordinate system */ + + if (EEL_CANVAS_ITEM_GET_CLASS (item)->bounds) + (* EEL_CANVAS_ITEM_GET_CLASS (item)->bounds) (item, &tx1, &ty1, &tx2, &ty2); + + /* Return the values */ + + if (x1) + *x1 = tx1; + + if (y1) + *y1 = ty1; + + if (x2) + *x2 = tx2; + + if (y2) + *y2 = ty2; +} + + +/** + * eel_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 +eel_canvas_item_request_update (EelCanvasItem *item) +{ + if (NULL == item->canvas) + return; + + g_return_if_fail (!item->canvas->doing_update); + + if (item->flags & EEL_CANVAS_ITEM_NEED_UPDATE) + return; + + item->flags |= EEL_CANVAS_ITEM_NEED_UPDATE; + + if (item->parent != NULL) + { + /* Recurse up the tree */ + eel_canvas_item_request_update (item->parent); + } + else + { + /* Have reached the top of the tree, make sure the update call gets scheduled. */ + eel_canvas_request_update (item->canvas); + } +} + +/** + * eel_canvas_item_request_update + * @item: A canvas item. + * + * Convenience function that informs a canvas that the specified item needs + * to be repainted. To be used by item implementations + **/ +void +eel_canvas_item_request_redraw (EelCanvasItem *item) +{ + if (item->flags & EEL_CANVAS_ITEM_MAPPED) + eel_canvas_request_redraw (item->canvas, + item->x1, item->y1, + item->x2 + 1, item->y2 + 1); +} + + + +/*** EelCanvasGroup ***/ + + +enum +{ + GROUP_PROP_0, + GROUP_PROP_X, + GROUP_PROP_Y +}; + + +static void eel_canvas_group_class_init (EelCanvasGroupClass *klass); +static void eel_canvas_group_init (EelCanvasGroup *group); +static void eel_canvas_group_set_property(GObject *object, + guint param_id, + const GValue *value, + GParamSpec *pspec); +static void eel_canvas_group_get_property(GObject *object, + guint param_id, + GValue *value, + GParamSpec *pspec); + +static void eel_canvas_group_destroy (GtkObject *object); + +static void eel_canvas_group_update (EelCanvasItem *item, + double i2w_dx, + double i2w_dy, + int flags); +static void eel_canvas_group_unrealize (EelCanvasItem *item); +static void eel_canvas_group_map (EelCanvasItem *item); +static void eel_canvas_group_unmap (EelCanvasItem *item); +static void eel_canvas_group_draw (EelCanvasItem *item, GdkDrawable *drawable, + GdkEventExpose *expose); +static double eel_canvas_group_point (EelCanvasItem *item, double x, double y, + int cx, int cy, + EelCanvasItem **actual_item); +static void eel_canvas_group_translate (EelCanvasItem *item, double dx, double dy); +static void eel_canvas_group_bounds (EelCanvasItem *item, double *x1, double *y1, + double *x2, double *y2); + + +static EelCanvasItemClass *group_parent_class; + + +/** + * eel_canvas_group_get_type: + * + * Registers the &EelCanvasGroup class if necessary, and returns the type ID + * associated to it. + * + * Return value: The type ID of the &EelCanvasGroup class. + **/ +GType +eel_canvas_group_get_type (void) +{ + static GType group_type = 0; + + if (!group_type) + { + static const GTypeInfo group_info = + { + sizeof (EelCanvasGroupClass), + (GBaseInitFunc) NULL, + (GBaseFinalizeFunc) NULL, + (GClassInitFunc) eel_canvas_group_class_init, + NULL, /* class_finalize */ + NULL, /* class_data */ + sizeof (EelCanvasGroup), + 0, /* n_preallocs */ + (GInstanceInitFunc) eel_canvas_group_init + + + }; + + group_type = g_type_register_static (eel_canvas_item_get_type (), + "EelCanvasGroup", + &group_info, + 0); + } + + return group_type; +} + +/* Class initialization function for EelCanvasGroupClass */ +static void +eel_canvas_group_class_init (EelCanvasGroupClass *klass) +{ + GObjectClass *gobject_class; + GtkObjectClass *object_class; + EelCanvasItemClass *item_class; + + gobject_class = (GObjectClass *) klass; + object_class = (GtkObjectClass *) klass; + item_class = (EelCanvasItemClass *) klass; + + group_parent_class = g_type_class_peek_parent (klass); + + gobject_class->set_property = eel_canvas_group_set_property; + gobject_class->get_property = eel_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_READWRITE)); + 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_READWRITE)); + + object_class->destroy = eel_canvas_group_destroy; + + item_class->update = eel_canvas_group_update; + item_class->unrealize = eel_canvas_group_unrealize; + item_class->map = eel_canvas_group_map; + item_class->unmap = eel_canvas_group_unmap; + item_class->draw = eel_canvas_group_draw; + item_class->point = eel_canvas_group_point; + item_class->translate = eel_canvas_group_translate; + item_class->bounds = eel_canvas_group_bounds; +} + +/* Object initialization function for EelCanvasGroup */ +static void +eel_canvas_group_init (EelCanvasGroup *group) +{ + group->xpos = 0.0; + group->ypos = 0.0; +} + +/* Set_property handler for canvas groups */ +static void +eel_canvas_group_set_property (GObject *gobject, guint param_id, + const GValue *value, GParamSpec *pspec) +{ + EelCanvasItem *item; + EelCanvasGroup *group; + double old; + gboolean moved; + + g_return_if_fail (EEL_IS_CANVAS_GROUP (gobject)); + + item = EEL_CANVAS_ITEM (gobject); + group = EEL_CANVAS_GROUP (gobject); + + moved = FALSE; + switch (param_id) + { + case GROUP_PROP_X: + old = group->xpos; + group->xpos = g_value_get_double (value); + if (old != group->xpos) + moved = TRUE; + break; + + case GROUP_PROP_Y: + old = group->ypos; + group->ypos = g_value_get_double (value); + if (old != group->ypos) + moved = TRUE; + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec); + break; + } + + if (moved) + { + item->flags |= EEL_CANVAS_ITEM_NEED_DEEP_UPDATE; + if (item->parent != NULL) + eel_canvas_item_request_update (item->parent); + else + eel_canvas_request_update (item->canvas); + } +} + +/* Get_property handler for canvas groups */ +static void +eel_canvas_group_get_property (GObject *gobject, guint param_id, + GValue *value, GParamSpec *pspec) +{ + EelCanvasItem *item; + EelCanvasGroup *group; + + g_return_if_fail (EEL_IS_CANVAS_GROUP (gobject)); + + item = EEL_CANVAS_ITEM (gobject); + group = EEL_CANVAS_GROUP (gobject); + + switch (param_id) + { + case GROUP_PROP_X: + g_value_set_double (value, group->xpos); + break; + + case GROUP_PROP_Y: + g_value_set_double (value, group->ypos); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec); + break; + } +} + +/* Destroy handler for canvas groups */ +static void +eel_canvas_group_destroy (GtkObject *object) +{ + EelCanvasGroup *group; + EelCanvasItem *child; + GList *list; + + g_return_if_fail (EEL_IS_CANVAS_GROUP (object)); + + group = EEL_CANVAS_GROUP (object); + + list = group->item_list; + while (list) + { + child = list->data; + list = list->next; + + gtk_object_destroy (GTK_OBJECT (child)); + } + + if (GTK_OBJECT_CLASS (group_parent_class)->destroy) + (* GTK_OBJECT_CLASS (group_parent_class)->destroy) (object); +} + +/* Update handler for canvas groups */ +static void +eel_canvas_group_update (EelCanvasItem *item, double i2w_dx, double i2w_dy, int flags) +{ + EelCanvasGroup *group; + GList *list; + EelCanvasItem *i; + double bbox_x0, bbox_y0, bbox_x1, bbox_y1; + gboolean first = TRUE; + + group = EEL_CANVAS_GROUP (item); + + (* group_parent_class->update) (item, i2w_dx, i2w_dy, 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; + + eel_canvas_item_invoke_update (i, i2w_dx + group->xpos, i2w_dy + group->ypos, flags); + + if (first) + { + first = FALSE; + bbox_x0 = i->x1; + bbox_y0 = i->y1; + bbox_x1 = i->x2; + bbox_y1 = i->y2; + } + else + { + bbox_x0 = MIN (bbox_x0, i->x1); + bbox_y0 = MIN (bbox_y0, i->y1); + bbox_x1 = MAX (bbox_x1, i->x2); + bbox_y1 = MAX (bbox_y1, i->y2); + } + } + item->x1 = bbox_x0; + item->y1 = bbox_y0; + item->x2 = bbox_x1; + item->y2 = bbox_y1; +} + +/* Unrealize handler for canvas groups */ +static void +eel_canvas_group_unrealize (EelCanvasItem *item) +{ + EelCanvasGroup *group; + GList *list; + EelCanvasItem *i; + + group = EEL_CANVAS_GROUP (item); + + /* Unmap group before children to avoid flash */ + if (item->flags & EEL_CANVAS_ITEM_MAPPED) + (* EEL_CANVAS_ITEM_GET_CLASS (item)->unmap) (item); + + for (list = group->item_list; list; list = list->next) + { + i = list->data; + + if (i->flags & EEL_CANVAS_ITEM_REALIZED) + (* EEL_CANVAS_ITEM_GET_CLASS (i)->unrealize) (i); + } + + (* group_parent_class->unrealize) (item); +} + +/* Map handler for canvas groups */ +static void +eel_canvas_group_map (EelCanvasItem *item) +{ + EelCanvasGroup *group; + GList *list; + EelCanvasItem *i; + + group = EEL_CANVAS_GROUP (item); + + for (list = group->item_list; list; list = list->next) + { + i = list->data; + + if (i->flags & EEL_CANVAS_ITEM_VISIBLE && + !(i->flags & EEL_CANVAS_ITEM_MAPPED)) + { + if (!(i->flags & EEL_CANVAS_ITEM_REALIZED)) + (* EEL_CANVAS_ITEM_GET_CLASS (i)->realize) (i); + + (* EEL_CANVAS_ITEM_GET_CLASS (i)->map) (i); + } + } + + (* group_parent_class->map) (item); +} + +/* Unmap handler for canvas groups */ +static void +eel_canvas_group_unmap (EelCanvasItem *item) +{ + EelCanvasGroup *group; + GList *list; + EelCanvasItem *i; + + group = EEL_CANVAS_GROUP (item); + + for (list = group->item_list; list; list = list->next) + { + i = list->data; + + if (i->flags & EEL_CANVAS_ITEM_MAPPED) + (* EEL_CANVAS_ITEM_GET_CLASS (i)->unmap) (i); + } + + (* group_parent_class->unmap) (item); +} + +/* Draw handler for canvas groups */ +static void +eel_canvas_group_draw (EelCanvasItem *item, GdkDrawable *drawable, + GdkEventExpose *expose) +{ + EelCanvasGroup *group; + GList *list; + EelCanvasItem *child = NULL; + + group = EEL_CANVAS_GROUP (item); + + for (list = group->item_list; list; list = list->next) + { + child = list->data; + + if ((child->flags & EEL_CANVAS_ITEM_MAPPED) && + (EEL_CANVAS_ITEM_GET_CLASS (child)->draw)) + { + GdkRectangle child_rect; + + child_rect.x = child->x1; + child_rect.y = child->y1; + child_rect.width = child->x2 - child->x1 + 1; + child_rect.height = child->y2 - child->y1 + 1; + + if (gdk_region_rect_in (expose->region, &child_rect) != GDK_OVERLAP_RECTANGLE_OUT) + (* EEL_CANVAS_ITEM_GET_CLASS (child)->draw) (child, drawable, expose); + } + } +} + +/* Point handler for canvas groups */ +static double +eel_canvas_group_point (EelCanvasItem *item, double x, double y, int cx, int cy, + EelCanvasItem **actual_item) +{ + EelCanvasGroup *group; + GList *list; + EelCanvasItem *child, *point_item; + int x1, y1, x2, y2; + double gx, gy; + double dist, best; + int has_point; + + group = EEL_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 - group->xpos; + gy = y - group->ypos; + + 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->flags & EEL_CANVAS_ITEM_MAPPED) + && EEL_CANVAS_ITEM_GET_CLASS (child)->point) + { + dist = eel_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; +} + +void +eel_canvas_group_translate (EelCanvasItem *item, double dx, double dy) +{ + EelCanvasGroup *group; + + group = EEL_CANVAS_GROUP (item); + + group->xpos += dx; + group->ypos += dy; +} + +/* Bounds handler for canvas groups */ +static void +eel_canvas_group_bounds (EelCanvasItem *item, double *x1, double *y1, double *x2, double *y2) +{ + EelCanvasGroup *group; + EelCanvasItem *child; + GList *list; + double tx1, ty1, tx2, ty2; + double minx, miny, maxx, maxy; + int set; + + group = EEL_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 & EEL_CANVAS_ITEM_MAPPED) + { + set = TRUE; + eel_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 & EEL_CANVAS_ITEM_MAPPED)) + continue; + + eel_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; + } + + /* Make the bounds be relative to our parent's coordinate system */ + + if (item->parent) + { + minx += group->xpos; + miny += group->ypos; + maxx += group->xpos; + maxy += group->ypos; + } + + *x1 = minx; + *y1 = miny; + *x2 = maxx; + *y2 = maxy; +} + +/* Adds an item to a group */ +static void +group_add (EelCanvasGroup *group, EelCanvasItem *item) +{ +#if GLIB_CHECK_VERSION(2,10,0) && GTK_CHECK_VERSION(2,8,14) + g_object_ref_sink (item); +#else + g_object_ref (item); + gtk_object_sink (GTK_OBJECT (item)); +#endif + + 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 (item->flags & EEL_CANVAS_ITEM_VISIBLE && + group->item.flags & EEL_CANVAS_ITEM_MAPPED) + { + if (!(item->flags & EEL_CANVAS_ITEM_REALIZED)) + (* EEL_CANVAS_ITEM_GET_CLASS (item)->realize) (item); + + if (!(item->flags & EEL_CANVAS_ITEM_MAPPED)) + (* EEL_CANVAS_ITEM_GET_CLASS (item)->map) (item); + } +} + +/* Removes an item from a group */ +static void +group_remove (EelCanvasGroup *group, EelCanvasItem *item) +{ + GList *children; + + g_return_if_fail (EEL_IS_CANVAS_GROUP (group)); + g_return_if_fail (EEL_IS_CANVAS_ITEM (item)); + + for (children = group->item_list; children; children = children->next) + if (children->data == item) + { + if (item->flags & EEL_CANVAS_ITEM_MAPPED) + (* EEL_CANVAS_ITEM_GET_CLASS (item)->unmap) (item); + + if (item->flags & EEL_CANVAS_ITEM_REALIZED) + (* EEL_CANVAS_ITEM_GET_CLASS (item)->unrealize) (item); + + /* Unparent the child */ + + item->parent = NULL; + /* item->canvas = 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; + } +} + + +/*** EelCanvas ***/ + + +enum +{ + DRAW_BACKGROUND, + LAST_SIGNAL +}; + +static void eel_canvas_class_init (EelCanvasClass *klass); +static void eel_canvas_init (EelCanvas *canvas); +static void eel_canvas_destroy (GtkObject *object); +static void eel_canvas_map (GtkWidget *widget); +static void eel_canvas_unmap (GtkWidget *widget); +static void eel_canvas_realize (GtkWidget *widget); +static void eel_canvas_unrealize (GtkWidget *widget); +static void eel_canvas_size_allocate (GtkWidget *widget, + GtkAllocation *allocation); +static gint eel_canvas_button (GtkWidget *widget, + GdkEventButton *event); +static gint eel_canvas_motion (GtkWidget *widget, + GdkEventMotion *event); +static gint eel_canvas_expose (GtkWidget *widget, + GdkEventExpose *event); +static gint eel_canvas_key (GtkWidget *widget, + GdkEventKey *event); +static gint eel_canvas_crossing (GtkWidget *widget, + GdkEventCrossing *event); +static gint eel_canvas_focus_in (GtkWidget *widget, + GdkEventFocus *event); +static gint eel_canvas_focus_out (GtkWidget *widget, + GdkEventFocus *event); +static void eel_canvas_request_update_real (EelCanvas *canvas); +static void eel_canvas_draw_background (EelCanvas *canvas, + int x, + int y, + int width, + int height); + + +static GtkLayoutClass *canvas_parent_class; + +static guint canvas_signals[LAST_SIGNAL]; + +/** + * eel_canvas_get_type: + * + * Registers the &EelCanvas class if necessary, and returns the type ID + * associated to it. + * + * Return value: The type ID of the &EelCanvas class. + **/ +GType +eel_canvas_get_type (void) +{ + static GType canvas_type = 0; + + if (!canvas_type) + { + static const GTypeInfo canvas_info = + { + sizeof (EelCanvasClass), + (GBaseInitFunc) NULL, + (GBaseFinalizeFunc) NULL, + (GClassInitFunc) eel_canvas_class_init, + NULL, /* class_finalize */ + NULL, /* class_data */ + sizeof (EelCanvas), + 0, /* n_preallocs */ + (GInstanceInitFunc) eel_canvas_init + }; + + canvas_type = g_type_register_static (gtk_layout_get_type (), + "EelCanvas", + &canvas_info, + 0); + } + + return canvas_type; +} + +static void +eel_canvas_get_property (GObject *object, + guint prop_id, + GValue *value, + GParamSpec *pspec) +{ + switch (prop_id) + { + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +static void +eel_canvas_set_property (GObject *object, + guint prop_id, + const GValue *value, + GParamSpec *pspec) +{ + switch (prop_id) + { + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +static void +eel_canvas_accessible_adjustment_changed (GtkAdjustment *adjustment, + gpointer data) +{ + AtkObject *atk_obj; + + /* The scrollbars have changed */ + atk_obj = ATK_OBJECT (data); + + g_signal_emit_by_name (atk_obj, "visible_data_changed"); +} + +static void +eel_canvas_accessible_initialize (AtkObject *obj, + gpointer data) +{ + EelCanvas *canvas; + + if (ATK_OBJECT_CLASS (accessible_parent_class)->initialize != NULL) + ATK_OBJECT_CLASS (accessible_parent_class)->initialize (obj, data); + + canvas = EEL_CANVAS (data); + g_signal_connect (gtk_layout_get_hadjustment (&canvas->layout), + "value_changed", + G_CALLBACK (eel_canvas_accessible_adjustment_changed), + obj); + g_signal_connect (gtk_layout_get_vadjustment (&canvas->layout), + "value_changed", + G_CALLBACK (eel_canvas_accessible_adjustment_changed), + obj); + + obj->role = ATK_ROLE_LAYERED_PANE; +} + +static gint +eel_canvas_accessible_get_n_children (AtkObject* obj) +{ + GtkAccessible *accessible; + GtkWidget *widget; + EelCanvas *canvas; + EelCanvasGroup *root_group; + + accessible = GTK_ACCESSIBLE (obj); + widget = gtk_accessible_get_widget (accessible); + if (widget == NULL) + { + /* State is defunct */ + return 0; + } + + g_return_val_if_fail (EEL_IS_CANVAS (widget), 0); + + canvas = EEL_CANVAS (widget); + root_group = eel_canvas_root (canvas); + g_return_val_if_fail (root_group, 0); + return 1; +} + +static AtkObject* +eel_canvas_accessible_ref_child (AtkObject *obj, + gint i) +{ + GtkAccessible *accessible; + GtkWidget *widget; + EelCanvas *canvas; + EelCanvasGroup *root_group; + AtkObject *atk_object; + + /* Canvas only has one child, so return NULL if index is non zero */ + if (i != 0) + { + return NULL; + } + + accessible = GTK_ACCESSIBLE (obj); + widget = gtk_accessible_get_widget (accessible); + if (widget == NULL) + { + /* State is defunct */ + return NULL; + } + + canvas = EEL_CANVAS (widget); + root_group = eel_canvas_root (canvas); + g_return_val_if_fail (root_group, NULL); + atk_object = atk_gobject_accessible_for_object (G_OBJECT (root_group)); + g_object_ref (atk_object); + + g_warning ("Accessible support for FooGroup needs to be implemented"); + + return atk_object; +} + +static void +eel_canvas_accessible_class_init (AtkObjectClass *klass) +{ + accessible_parent_class = g_type_class_peek_parent (klass); + + klass->initialize = eel_canvas_accessible_initialize; + klass->get_n_children = eel_canvas_accessible_get_n_children; + klass->ref_child = eel_canvas_accessible_ref_child; +} + +static GType +eel_canvas_accessible_get_type (void) +{ + static GType type = 0; + + if (!type) + { + AtkObjectFactory *factory; + GType parent_atk_type; + GTypeQuery query; + GTypeInfo tinfo = { 0 }; + + factory = atk_registry_get_factory (atk_get_default_registry(), + GTK_TYPE_WIDGET); + if (!factory) + { + return G_TYPE_INVALID; + } + parent_atk_type = atk_object_factory_get_accessible_type (factory); + if (!parent_atk_type) + { + return G_TYPE_INVALID; + } + g_type_query (parent_atk_type, &query); + tinfo.class_init = (GClassInitFunc) eel_canvas_accessible_class_init; + tinfo.class_size = query.class_size; + tinfo.instance_size = query.instance_size; + type = g_type_register_static (parent_atk_type, + "EelCanvasAccessibility", + &tinfo, 0); + } + return type; +} + +static AtkObject * +eel_canvas_accessible_create (GObject *for_object) +{ + GType type; + AtkObject *accessible; + EelCanvas *canvas; + + canvas = EEL_CANVAS (for_object); + g_return_val_if_fail (canvas != NULL, NULL); + + type = eel_canvas_accessible_get_type (); + + if (type == G_TYPE_INVALID) + { + return atk_no_op_object_new (for_object); + } + + accessible = g_object_new (type, NULL); + atk_object_initialize (accessible, for_object); + return accessible; +} + +static GType +eel_canvas_accessible_factory_get_accessible_type (void) +{ + return eel_canvas_accessible_get_type (); +} + +static AtkObject* +eel_canvas_accessible_factory_create_accessible (GObject *obj) +{ + AtkObject *accessible; + + g_return_val_if_fail (G_IS_OBJECT (obj), NULL); + + accessible = eel_canvas_accessible_create (obj); + + return accessible; +} + +static void +eel_canvas_accessible_factory_class_init (AtkObjectFactoryClass *klass) +{ + klass->create_accessible = eel_canvas_accessible_factory_create_accessible; + klass->get_accessible_type = eel_canvas_accessible_factory_get_accessible_type; +} + +static GType +eel_canvas_accessible_factory_get_type (void) +{ + static GType type = 0; + + if (!type) + { + static const GTypeInfo tinfo = + { + sizeof (AtkObjectFactoryClass), + (GBaseInitFunc) NULL, + (GBaseFinalizeFunc) NULL, + (GClassInitFunc) eel_canvas_accessible_factory_class_init, + NULL, /* class_finalize */ + NULL, /* class_data */ + sizeof (AtkObjectFactory), + 0, /* n_preallocs */ + NULL + }; + type = g_type_register_static (ATK_TYPE_OBJECT_FACTORY, + "EelCanvasAccessibilityFactory", + &tinfo, 0); + } + + return type; +} + + +/* Class initialization function for EelCanvasClass */ +static void +eel_canvas_class_init (EelCanvasClass *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 = eel_canvas_set_property; + gobject_class->get_property = eel_canvas_get_property; + + object_class->destroy = eel_canvas_destroy; + + widget_class->map = eel_canvas_map; + widget_class->unmap = eel_canvas_unmap; + widget_class->realize = eel_canvas_realize; + widget_class->unrealize = eel_canvas_unrealize; + widget_class->size_allocate = eel_canvas_size_allocate; + widget_class->button_press_event = eel_canvas_button; + widget_class->button_release_event = eel_canvas_button; + widget_class->motion_notify_event = eel_canvas_motion; + widget_class->expose_event = eel_canvas_expose; + widget_class->key_press_event = eel_canvas_key; + widget_class->key_release_event = eel_canvas_key; + widget_class->enter_notify_event = eel_canvas_crossing; + widget_class->leave_notify_event = eel_canvas_crossing; + widget_class->focus_in_event = eel_canvas_focus_in; + widget_class->focus_out_event = eel_canvas_focus_out; + + klass->draw_background = eel_canvas_draw_background; + klass->request_update = eel_canvas_request_update_real; + + canvas_signals[DRAW_BACKGROUND] = + g_signal_new ("draw_background", + G_TYPE_FROM_CLASS (object_class), + G_SIGNAL_RUN_LAST, + G_STRUCT_OFFSET (EelCanvasClass, draw_background), + NULL, NULL, + eel_marshal_VOID__INT_INT_INT_INT, + G_TYPE_NONE, 4, + G_TYPE_INT, G_TYPE_INT, G_TYPE_INT, G_TYPE_INT); + + atk_registry_set_factory_type (atk_get_default_registry (), + EEL_TYPE_CANVAS, + eel_canvas_accessible_factory_get_type ()); +} + +/* Callback used when the root item of a canvas is destroyed. The user should + * never ever do this, so we panic if this happens. + */ +static void +panic_root_destroyed (GtkObject *object, gpointer data) +{ + g_error ("Eeeek, root item %p of canvas %p was destroyed!", object, data); +} + +/* Object initialization function for EelCanvas */ +static void +eel_canvas_init (EelCanvas *canvas) +{ + guint width, height; + gtk_widget_set_can_focus (GTK_WIDGET (canvas), TRUE); + + gtk_widget_set_redraw_on_allocate (GTK_WIDGET (canvas), FALSE); + + canvas->scroll_x1 = 0.0; + canvas->scroll_y1 = 0.0; + gtk_layout_get_size (&canvas->layout, + &width, &height); + canvas->scroll_x2 = width; + canvas->scroll_y2 = 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; + + gtk_layout_set_hadjustment (GTK_LAYOUT (canvas), NULL); + gtk_layout_set_vadjustment (GTK_LAYOUT (canvas), NULL); + + /* Create the root item as a special case */ + + canvas->root = EEL_CANVAS_ITEM (g_object_new (eel_canvas_group_get_type (), NULL)); + canvas->root->canvas = canvas; + +#if GLIB_CHECK_VERSION(2,10,0) && GTK_CHECK_VERSION(2,8,14) + g_object_ref_sink (canvas->root); +#else + g_object_ref (canvas->root); + gtk_object_sink (GTK_OBJECT (canvas->root)); +#endif + + canvas->root_destroy_id = g_signal_connect (G_OBJECT (canvas->root), + "destroy", G_CALLBACK (panic_root_destroyed), canvas); + + canvas->need_repick = TRUE; + canvas->doing_update = FALSE; +} + +/* Convenience function to remove the idle handler of a canvas */ +static void +remove_idle (EelCanvas *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 (EelCanvas *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; + } + + if (canvas->grabbed_item) + { + GdkDisplay *display = gtk_widget_get_display (GTK_WIDGET (canvas)); + canvas->grabbed_item = NULL; + gdk_display_pointer_ungrab (display, GDK_CURRENT_TIME); + } + + remove_idle (canvas); +} + +/* Destroy handler for EelCanvas */ +static void +eel_canvas_destroy (GtkObject *object) +{ + EelCanvas *canvas; + + g_return_if_fail (EEL_IS_CANVAS (object)); + + /* remember, destroy can be run multiple times! */ + + canvas = EEL_CANVAS (object); + + if (canvas->root_destroy_id) + { + g_signal_handler_disconnect (G_OBJECT (canvas->root), canvas->root_destroy_id); + canvas->root_destroy_id = 0; + } + if (canvas->root) + { + EelCanvasItem *root = canvas->root; + canvas->root = NULL; + gtk_object_destroy (GTK_OBJECT (root)); + g_object_unref (root); + } + + shutdown_transients (canvas); + + if (GTK_OBJECT_CLASS (canvas_parent_class)->destroy) + (* GTK_OBJECT_CLASS (canvas_parent_class)->destroy) (object); +} + +/** + * eel_canvas_new: + * @void: + * + * Creates a new empty canvas. If you wish to use the + * &EelCanvasImage item inside this canvas, then you must push the gdk_imlib + * visual and colormap before calling this function, and they can be popped + * afterwards. + * + * Return value: A newly-created canvas. + **/ +GtkWidget * +eel_canvas_new (void) +{ + return GTK_WIDGET (g_object_new (eel_canvas_get_type (), NULL)); +} + +/* Map handler for the canvas */ +static void +eel_canvas_map (GtkWidget *widget) +{ + EelCanvas *canvas; + + g_return_if_fail (EEL_IS_CANVAS (widget)); + + /* Normal widget mapping stuff */ + + if (GTK_WIDGET_CLASS (canvas_parent_class)->map) + (* GTK_WIDGET_CLASS (canvas_parent_class)->map) (widget); + + canvas = EEL_CANVAS (widget); + + /* Map items */ + + if (canvas->root->flags & EEL_CANVAS_ITEM_VISIBLE && + !(canvas->root->flags & EEL_CANVAS_ITEM_MAPPED) && + EEL_CANVAS_ITEM_GET_CLASS (canvas->root)->map) + (* EEL_CANVAS_ITEM_GET_CLASS (canvas->root)->map) (canvas->root); +} + +/* Unmap handler for the canvas */ +static void +eel_canvas_unmap (GtkWidget *widget) +{ + EelCanvas *canvas; + + g_return_if_fail (EEL_IS_CANVAS (widget)); + + canvas = EEL_CANVAS (widget); + + shutdown_transients (canvas); + + /* Unmap items */ + + if (EEL_CANVAS_ITEM_GET_CLASS (canvas->root)->unmap) + (* EEL_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 +eel_canvas_realize (GtkWidget *widget) +{ + EelCanvas *canvas; + + g_return_if_fail (EEL_IS_CANVAS (widget)); + + /* Normal widget realization stuff */ + + if (GTK_WIDGET_CLASS (canvas_parent_class)->realize) + (* GTK_WIDGET_CLASS (canvas_parent_class)->realize) (widget); + + canvas = EEL_CANVAS (widget); + + gdk_window_set_events (gtk_layout_get_bin_window (&canvas->layout), + (gdk_window_get_events (gtk_layout_get_bin_window (&canvas->layout)) + | 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 (gtk_layout_get_bin_window (&canvas->layout)); + + (* EEL_CANVAS_ITEM_GET_CLASS (canvas->root)->realize) (canvas->root); +} + +/* Unrealize handler for the canvas */ +static void +eel_canvas_unrealize (GtkWidget *widget) +{ + EelCanvas *canvas; + + g_return_if_fail (EEL_IS_CANVAS (widget)); + + canvas = EEL_CANVAS (widget); + + shutdown_transients (canvas); + + /* Unrealize items and parent widget */ + + (* EEL_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 (EelCanvas *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; + GtkAllocation allocation; + GtkAdjustment *vadjustment, *hadjustment; + guint width, height; + + gtk_widget_get_allocation (GTK_WIDGET (canvas), &allocation); + canvas_width = allocation.width; + canvas_height = 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 */ + /* More stuff - we have to mark root as needing fresh affine (Lauris) */ + if (!(canvas->root->flags & EEL_CANVAS_ITEM_NEED_DEEP_UPDATE)) + { + canvas->root->flags |= EEL_CANVAS_ITEM_NEED_DEEP_UPDATE; + eel_canvas_request_update (canvas); + } + gtk_widget_queue_draw (GTK_WIDGET (canvas)); + } + + hadjustment = gtk_layout_get_hadjustment (&canvas->layout); + vadjustment = gtk_layout_get_vadjustment (&canvas->layout); + + if (((int) gtk_adjustment_get_value (hadjustment)) != cx) + { + gtk_adjustment_set_value (hadjustment, cx); + changed_x = TRUE; + } + + if (((int) gtk_adjustment_get_value (vadjustment)) != cy) + { + gtk_adjustment_set_value (vadjustment, cy); + changed_y = TRUE; + } + + gtk_layout_get_size (&canvas->layout, &width, &height); + if ((scroll_width != (int) width )|| (scroll_height != (int) 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 (hadjustment, "value_changed"); + if (changed_y) + g_signal_emit_by_name (vadjustment, "value_changed"); +} + +/* Size allocation handler for the canvas */ +static void +eel_canvas_size_allocate (GtkWidget *widget, GtkAllocation *allocation) +{ + EelCanvas *canvas; + GtkAdjustment *vadjustment, *hadjustment; + + g_return_if_fail (EEL_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 = EEL_CANVAS (widget); + + /* Recenter the view, if appropriate */ + + hadjustment = gtk_layout_get_hadjustment (&canvas->layout); + vadjustment = gtk_layout_get_vadjustment (&canvas->layout); + + 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 (canvas, + gtk_adjustment_get_value (hadjustment), + gtk_adjustment_get_value (vadjustment)); + + g_signal_emit_by_name (hadjustment, "changed"); + g_signal_emit_by_name (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 (EelCanvas *canvas, GdkEvent *event) +{ + GdkEvent ev; + gint finished; + EelCanvasItem *item; + EelCanvasItem *parent; + guint mask; + + /* Could be an old pick event */ + if (!gtk_widget_get_realized (GTK_WIDGET (canvas))) + { + return FALSE; + } + + /* Perform checks for grabbed items */ + + if (canvas->grabbed_item && + !is_descendant (canvas->current_item, canvas->grabbed_item)) + { + 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; + + 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 = *event; + + switch (ev.type) + { + case GDK_ENTER_NOTIFY: + case GDK_LEAVE_NOTIFY: + eel_canvas_window_to_world (canvas, + ev.crossing.x, ev.crossing.y, + &ev.crossing.x, &ev.crossing.y); + break; + + case GDK_MOTION_NOTIFY: + eel_canvas_window_to_world (canvas, + ev.motion.x, ev.motion.y, + &ev.motion.x, &ev.motion.y); + break; + + case GDK_BUTTON_PRESS: + case GDK_2BUTTON_PRESS: + case GDK_3BUTTON_PRESS: + eel_canvas_window_to_world (canvas, + ev.motion.x, ev.motion.y, + &ev.motion.x, &ev.motion.y); + break; + + case GDK_BUTTON_RELEASE: + eel_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 (GTK_OBJECT (item)); + + g_signal_emit ( + G_OBJECT (item), item_signals[ITEM_EVENT], 0, + &ev, &finished); + + parent = item->parent; + g_object_unref (GTK_OBJECT (item)); + + item = parent; + } + + 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 (EelCanvas *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; + y = canvas->pick_event.crossing.y; + } + else + { + x = canvas->pick_event.motion.x; + y = canvas->pick_event.motion.y; + } + + /* canvas pixel coords */ + + cx = (int) (x + 0.5); + cy = (int) (y + 0.5); + + /* world coords */ + eel_canvas_c2w (canvas, cx, cy, &x, &y); + + /* find the closest item */ + if (canvas->root->flags & EEL_CANVAS_ITEM_MAPPED) + eel_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; + EelCanvasItem *item; + + item = canvas->current_item; + + 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 +eel_canvas_button (GtkWidget *widget, GdkEventButton *event) +{ + EelCanvas *canvas; + int mask; + int retval; + + g_return_val_if_fail (EEL_IS_CANVAS (widget), FALSE); + g_return_val_if_fail (event != NULL, FALSE); + + retval = FALSE; + + canvas = EEL_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 != gtk_layout_get_bin_window (&canvas->layout)) + 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 +eel_canvas_motion (GtkWidget *widget, GdkEventMotion *event) +{ + EelCanvas *canvas; + + g_return_val_if_fail (EEL_IS_CANVAS (widget), FALSE); + g_return_val_if_fail (event != NULL, FALSE); + + canvas = EEL_CANVAS (widget); + + if (event->window != gtk_layout_get_bin_window (&canvas->layout)) + 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 gint +eel_canvas_key (GtkWidget *widget, GdkEventKey *event) +{ + EelCanvas *canvas; + + g_return_val_if_fail (EEL_IS_CANVAS (widget), FALSE); + g_return_val_if_fail (event != NULL, FALSE); + + canvas = EEL_CANVAS (widget); + + if (emit_event (canvas, (GdkEvent *) event)) + return TRUE; + if (event->type == GDK_KEY_RELEASE) + return GTK_WIDGET_CLASS (canvas_parent_class)->key_release_event (widget, event); + else + return GTK_WIDGET_CLASS (canvas_parent_class)->key_press_event (widget, event); +} + + +/* Crossing event handler for the canvas */ +static gint +eel_canvas_crossing (GtkWidget *widget, GdkEventCrossing *event) +{ + EelCanvas *canvas; + + g_return_val_if_fail (EEL_IS_CANVAS (widget), FALSE); + g_return_val_if_fail (event != NULL, FALSE); + + canvas = EEL_CANVAS (widget); + + if (event->window != gtk_layout_get_bin_window (&canvas->layout)) + return FALSE; + + canvas->state = event->state; + return pick_current_item (canvas, (GdkEvent *) event); +} + +/* Focus in handler for the canvas */ +static gint +eel_canvas_focus_in (GtkWidget *widget, GdkEventFocus *event) +{ + EelCanvas *canvas; + + canvas = EEL_CANVAS (widget); + + if (canvas->focused_item) + return emit_event (canvas, (GdkEvent *) event); + else + return FALSE; +} + +/* Focus out handler for the canvas */ +static gint +eel_canvas_focus_out (GtkWidget *widget, GdkEventFocus *event) +{ + EelCanvas *canvas; + + canvas = EEL_CANVAS (widget); + + if (canvas->focused_item) + return emit_event (canvas, (GdkEvent *) event); + else + return FALSE; +} + +/* Expose handler for the canvas */ +static gint +eel_canvas_expose (GtkWidget *widget, GdkEventExpose *event) +{ + EelCanvas *canvas; + + canvas = EEL_CANVAS (widget); + + if (!gtk_widget_is_drawable (widget) || (event->window != gtk_layout_get_bin_window (&canvas->layout))) return FALSE; + +#ifdef VERBOSE + g_print ("Expose\n"); +#endif + /* If there are any outstanding items that need updating, do them now */ + if (canvas->idle_id) + { + g_source_remove (canvas->idle_id); + canvas->idle_id = 0; + } + if (canvas->need_update) + { + g_return_val_if_fail (!canvas->doing_update, FALSE); + + canvas->doing_update = TRUE; + eel_canvas_item_invoke_update (canvas->root, 0, 0, 0); + + g_return_val_if_fail (canvas->doing_update, FALSE); + + canvas->doing_update = FALSE; + + canvas->need_update = FALSE; + } + + /* Hmmm. Would like to queue antiexposes if the update marked + anything that is gonna get redrawn as invalid */ + + + g_signal_emit (G_OBJECT (canvas), canvas_signals[DRAW_BACKGROUND], 0, + event->area.x, event->area.y, + event->area.width, event->area.height); + + if (canvas->root->flags & EEL_CANVAS_ITEM_MAPPED) + (* EEL_CANVAS_ITEM_GET_CLASS (canvas->root)->draw) (canvas->root, + gtk_layout_get_bin_window (&canvas->layout), + event); + + + + /* Chain up to get exposes on child widgets */ + GTK_WIDGET_CLASS (canvas_parent_class)->expose_event (widget, event); + + return FALSE; +} + +static void +eel_canvas_draw_background (EelCanvas *canvas, + int x, int y, int width, int height) +{ + /* By default, we use the style background. */ + gdk_gc_set_foreground (canvas->pixmap_gc, + >k_widget_get_style (GTK_WIDGET (canvas))->bg[GTK_STATE_NORMAL]); + gdk_draw_rectangle (gtk_layout_get_bin_window (&canvas->layout), + canvas->pixmap_gc, + TRUE, + x, y, + width, height); +} + +static void +do_update (EelCanvas *canvas) +{ + /* Cause the update if necessary */ + +update_again: + if (canvas->need_update) + { + g_return_if_fail (!canvas->doing_update); + + canvas->doing_update = TRUE; + eel_canvas_item_invoke_update (canvas->root, 0, 0, 0); + + g_return_if_fail (canvas->doing_update); + + canvas->doing_update = FALSE; + + 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 gint +idle_handler (gpointer data) +{ + EelCanvas *canvas; + + GDK_THREADS_ENTER (); + + canvas = EEL_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 (EelCanvas *canvas) +{ + if (!canvas->idle_id) + { + /* We let the update idle handler have higher priority + * than the redraw idle handler so the canvas state + * will be updated during the expose event. canvas in + * expose_event. + */ + canvas->idle_id = g_idle_add_full (GDK_PRIORITY_REDRAW - 20, + idle_handler, canvas, NULL); + } +} + +/** + * eel_canvas_root: + * @canvas: A canvas. + * + * Queries the root group of a canvas. + * + * Return value: The root group of the specified canvas. + **/ +EelCanvasGroup * +eel_canvas_root (EelCanvas *canvas) +{ + g_return_val_if_fail (EEL_IS_CANVAS (canvas), NULL); + + return EEL_CANVAS_GROUP (canvas->root); +} + + +/** + * eel_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 +eel_canvas_set_scroll_region (EelCanvas *canvas, double x1, double y1, double x2, double y2) +{ + double wxofs, wyofs; + int xofs, yofs; + GtkAdjustment *vadjustment, *hadjustment; + + g_return_if_fail (EEL_IS_CANVAS (canvas)); + + if ((canvas->scroll_x1 == x1) && (canvas->scroll_y1 == y1) && + (canvas->scroll_x2 == x2) && (canvas->scroll_y2 == y2)) + { + return; + } + + /* + * Set the new scrolling region. If possible, do not move the visible contents of the + * canvas. + */ + hadjustment = gtk_layout_get_hadjustment (GTK_LAYOUT (canvas)); + vadjustment = gtk_layout_get_vadjustment (GTK_LAYOUT (canvas)); + + eel_canvas_c2w (canvas, + gtk_adjustment_get_value (hadjustment) + canvas->zoom_xofs, + gtk_adjustment_get_value (vadjustment) + 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; + + eel_canvas_w2c (canvas, wxofs, wyofs, &xofs, &yofs); + + scroll_to (canvas, xofs, yofs); + + canvas->need_repick = TRUE; + + if (!(canvas->root->flags & EEL_CANVAS_ITEM_NEED_DEEP_UPDATE)) + { + canvas->root->flags |= EEL_CANVAS_ITEM_NEED_DEEP_UPDATE; + eel_canvas_request_update (canvas); + } +} + + +/** + * eel_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 +eel_canvas_get_scroll_region (EelCanvas *canvas, double *x1, double *y1, double *x2, double *y2) +{ + g_return_if_fail (EEL_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; +} + +void +eel_canvas_set_center_scroll_region (EelCanvas *canvas, + gboolean center_scroll_region) +{ + GtkAdjustment *vadjustment, *hadjustment; + + g_return_if_fail (EEL_IS_CANVAS (canvas)); + + canvas->center_scroll_region = center_scroll_region != 0; + + hadjustment = gtk_layout_get_hadjustment (&canvas->layout); + vadjustment = gtk_layout_get_vadjustment (&canvas->layout); + + scroll_to (canvas, + gtk_adjustment_get_value (hadjustment), + gtk_adjustment_get_value (vadjustment)); +} + + +/** + * eel_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. + **/ +void +eel_canvas_set_pixels_per_unit (EelCanvas *canvas, double n) +{ + GtkWidget *widget; + double cx, cy; + int x1, y1; + int center_x, center_y; + GdkWindow *window; + GdkWindowAttr attributes; + gint attributes_mask; + GtkAllocation allocation; + GtkAdjustment *vadjustment, *hadjustment; + + g_return_if_fail (EEL_IS_CANVAS (canvas)); + g_return_if_fail (n > EEL_CANVAS_EPSILON); + + widget = GTK_WIDGET (canvas); + + gtk_widget_get_allocation (widget, &allocation); + center_x = allocation.width / 2; + center_y = allocation.height / 2; + + /* Find the coordinates of the screen center in units. */ + hadjustment = gtk_layout_get_hadjustment (&canvas->layout); + vadjustment = gtk_layout_get_vadjustment (&canvas->layout); + cx = (gtk_adjustment_get_value (hadjustment) + center_x) / canvas->pixels_per_unit + canvas->scroll_x1 + canvas->zoom_xofs; + cy = (gtk_adjustment_get_value (vadjustment) + center_y) / canvas->pixels_per_unit + canvas->scroll_y1 + canvas->zoom_yofs; + + /* Now calculate the new offset of the upper left corner. (round not truncate) */ + x1 = ((cx - canvas->scroll_x1) * n) - center_x + .5; + y1 = ((cy - canvas->scroll_y1) * n) - center_y + .5; + + canvas->pixels_per_unit = n; + + if (!(canvas->root->flags & EEL_CANVAS_ITEM_NEED_DEEP_UPDATE)) + { + canvas->root->flags |= EEL_CANVAS_ITEM_NEED_DEEP_UPDATE; + eel_canvas_request_update (canvas); + } + + /* Map a background None window over the bin_window to avoid + * scrolling the window scroll causing exposes. + */ + window = NULL; + if (gtk_widget_get_mapped (widget)) + { + GtkAllocation allocation; + attributes.window_type = GDK_WINDOW_CHILD; + gtk_widget_get_allocation (widget, &allocation); + attributes.x = allocation.x; + attributes.y = allocation.y; + attributes.width = allocation.width; + attributes.height = allocation.height; + attributes.wclass = GDK_INPUT_OUTPUT; + attributes.visual = gtk_widget_get_visual (widget); + attributes.colormap = gtk_widget_get_colormap (widget); + attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK; + + attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP; + + window = gdk_window_new (gtk_widget_get_parent_window (widget), + &attributes, attributes_mask); + gdk_window_set_back_pixmap (window, NULL, FALSE); + gdk_window_set_user_data (window, widget); + + gdk_window_show (window); + } + + scroll_to (canvas, x1, y1); + + /* If we created a an overlapping background None window, remove it how. + * + * TODO: We would like to temporarily set the bin_window background to + * None to avoid clearing the bin_window to the background, but gdk doesn't + * expose enought to let us do this, so we get a flash-effect here. At least + * it looks better than scroll + expose. + */ + if (window != NULL) + { + gdk_window_hide (window); + gdk_window_set_user_data (window, NULL); + gdk_window_destroy (window); + } + + canvas->need_repick = TRUE; +} + +/** + * eel_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 +eel_canvas_scroll_to (EelCanvas *canvas, int cx, int cy) +{ + g_return_if_fail (EEL_IS_CANVAS (canvas)); + + scroll_to (canvas, cx, cy); +} + +/** + * eel_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 +eel_canvas_get_scroll_offsets (EelCanvas *canvas, int *cx, int *cy) +{ + GtkAdjustment *vadjustment, *hadjustment; + + g_return_if_fail (EEL_IS_CANVAS (canvas)); + + hadjustment = gtk_layout_get_hadjustment (&canvas->layout); + vadjustment = gtk_layout_get_vadjustment (&canvas->layout); + + if (cx) + *cx = gtk_adjustment_get_value (hadjustment); + + if (cy) + *cy = gtk_adjustment_get_value (vadjustment); +} + +/** + * eel_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 +eel_canvas_update_now (EelCanvas *canvas) +{ + g_return_if_fail (EEL_IS_CANVAS (canvas)); + + if (!(canvas->need_update || canvas->need_redraw)) + return; + remove_idle (canvas); + do_update (canvas); +} + +/** + * eel_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. + **/ +EelCanvasItem * +eel_canvas_get_item_at (EelCanvas *canvas, double x, double y) +{ + EelCanvasItem *item; + double dist; + int cx, cy; + + g_return_val_if_fail (EEL_IS_CANVAS (canvas), NULL); + + eel_canvas_w2c (canvas, x, y, &cx, &cy); + + dist = eel_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 +eel_canvas_request_update (EelCanvas *canvas) +{ + EEL_CANVAS_GET_CLASS (canvas)->request_update (canvas); +} + +static void +eel_canvas_request_update_real (EelCanvas *canvas) +{ + canvas->need_update = TRUE; + add_idle (canvas); +} + +/** + * eel_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 +eel_canvas_request_redraw (EelCanvas *canvas, int x1, int y1, int x2, int y2) +{ + GdkRectangle bbox; + + g_return_if_fail (EEL_IS_CANVAS (canvas)); + + if (!gtk_widget_is_drawable (GTK_WIDGET (canvas)) + || (x1 >= x2) || (y1 >= y2)) return; + + bbox.x = x1; + bbox.y = y1; + bbox.width = x2 - x1; + bbox.height = y2 - y1; + + gdk_window_invalidate_rect (gtk_layout_get_bin_window (&canvas->layout), + &bbox, FALSE); +} + +/** + * eel_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 +eel_canvas_w2c (EelCanvas *canvas, double wx, double wy, int *cx, int *cy) +{ + double zoom; + + g_return_if_fail (EEL_IS_CANVAS (canvas)); + + zoom = canvas->pixels_per_unit; + + if (cx) + *cx = floor ((wx - canvas->scroll_x1)*zoom + canvas->zoom_xofs + 0.5); + if (cy) + *cy = floor ((wy - canvas->scroll_y1)*zoom + canvas->zoom_yofs + 0.5); +} + +/** + * eel_canvas_w2c: + * @canvas: A canvas. + * @world: rectangle in world coordinates. + * @canvas: rectangle in canvase coordinates. + * + * Converts rectangles in world coordinates into canvas pixel coordinates. + **/ +void +eel_canvas_w2c_rect_d (EelCanvas *canvas, + double *x1, double *y1, + double *x2, double *y2) +{ + eel_canvas_w2c_d (canvas, + *x1, *y1, + x1, y1); + eel_canvas_w2c_d (canvas, + *x2, *y2, + x2, y2); +} + + + +/** + * eel_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 + * produces coordinates in floating point coordinates, for greater precision. + **/ +void +eel_canvas_w2c_d (EelCanvas *canvas, double wx, double wy, double *cx, double *cy) +{ + double zoom; + + g_return_if_fail (EEL_IS_CANVAS (canvas)); + + zoom = canvas->pixels_per_unit; + + if (cx) + *cx = (wx - canvas->scroll_x1)*zoom + canvas->zoom_xofs; + if (cy) + *cy = (wy - canvas->scroll_y1)*zoom + canvas->zoom_yofs; +} + + +/** + * eel_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 +eel_canvas_c2w (EelCanvas *canvas, int cx, int cy, double *wx, double *wy) +{ + double zoom; + + g_return_if_fail (EEL_IS_CANVAS (canvas)); + + zoom = canvas->pixels_per_unit; + + if (wx) + *wx = (cx - canvas->zoom_xofs)/zoom + canvas->scroll_x1; + if (wy) + *wy = (cy - canvas->zoom_yofs)/zoom + canvas->scroll_y1; +} + + +/** + * eel_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. + * Window coordinates are really the same as canvas coordinates now, but this + * function is here for backwards compatibility reasons. + **/ +void +eel_canvas_window_to_world (EelCanvas *canvas, double winx, double winy, + double *worldx, double *worldy) +{ + g_return_if_fail (EEL_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); +} + + +/** + * eel_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. + * Window coordinates are really the same as canvas coordinates now, but this + * function is here for backwards compatibility reasons. + **/ +void +eel_canvas_world_to_window (EelCanvas *canvas, double worldx, double worldy, + double *winx, double *winy) +{ + g_return_if_fail (EEL_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; +} + + + +/** + * eel_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 +eel_canvas_get_color (EelCanvas *canvas, const char *spec, GdkColor *color) +{ + GdkColormap *colormap; + + g_return_val_if_fail (EEL_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; +} + +/** + * eel_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 +eel_canvas_get_color_pixel (EelCanvas *canvas, guint rgba) +{ + GdkColormap *colormap; + GdkColor color; + + g_return_val_if_fail (EEL_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; +} + + +/* FIXME: This function is not useful anymore */ +/** + * eel_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 +eel_canvas_set_stipple_origin (EelCanvas *canvas, GdkGC *gc) +{ + g_return_if_fail (EEL_IS_CANVAS (canvas)); + g_return_if_fail (GDK_IS_GC (gc)); + + gdk_gc_set_ts_origin (gc, 0, 0); +} + +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; +} + +static guint +eel_canvas_item_accessible_add_focus_handler (AtkComponent *component, + AtkFocusHandler handler) +{ + GSignalMatchType match_type; + guint signal_id; + + match_type = G_SIGNAL_MATCH_ID | G_SIGNAL_MATCH_FUNC; + signal_id = g_signal_lookup ("focus-event", ATK_TYPE_OBJECT); + + if (!g_signal_handler_find (component, match_type, signal_id, 0, NULL, + (gpointer) handler, NULL)) + { + return g_signal_connect_closure_by_id (component, + signal_id, 0, + g_cclosure_new ( + G_CALLBACK (handler), NULL, + (GClosureNotify) NULL), + FALSE); + } + return 0; +} + +static void +eel_canvas_item_accessible_get_item_extents (EelCanvasItem *item, + GdkRectangle *rect) +{ + double bx1, bx2, by1, by2; + gint scroll_x, scroll_y; + gint x1, x2, y1, y2; + + eel_canvas_item_get_bounds (item, &bx1, &by1, &bx2, &by2); + eel_canvas_w2c_rect_d (item->canvas, &bx1, &by1, &bx2, &by2); + eel_canvas_get_scroll_offsets (item->canvas, &scroll_x, &scroll_y); + x1 = floor (bx1 + .5); + y1 = floor (by1 + .5); + x2 = floor (bx2 + .5); + y2 = floor (by2 + .5); + rect->x = x1 - scroll_x; + rect->y = y1 - scroll_y; + rect->width = x2 - x1; + rect->height = y2 - y1; +} + +static gboolean +eel_canvas_item_accessible_is_item_in_window (EelCanvasItem *item, + GdkRectangle *rect) +{ + GtkWidget *widget; + gboolean retval; + + widget = GTK_WIDGET (item->canvas); + if (gtk_widget_get_window (widget)) + { + int window_width, window_height; + + gdk_window_get_geometry (gtk_widget_get_window (widget), NULL, NULL, + &window_width, &window_height, NULL); + /* + * Check whether rectangles intersect + */ + if (rect->x + rect->width < 0 || + rect->y + rect->height < 0 || + rect->x > window_width || + rect->y > window_height) + { + retval = FALSE; + } + else + { + retval = TRUE; + } + } + else + { + retval = FALSE; + } + return retval; +} + + +static void +eel_canvas_item_accessible_get_extents (AtkComponent *component, + gint *x, + gint *y, + gint *width, + gint *height, + AtkCoordType coord_type) +{ + AtkGObjectAccessible *atk_gobj; + GObject *obj; + EelCanvasItem *item; + gint window_x, window_y; + gint toplevel_x, toplevel_y; + GdkRectangle rect; + GdkWindow *window; + GtkWidget *canvas; + + atk_gobj = ATK_GOBJECT_ACCESSIBLE (component); + obj = atk_gobject_accessible_get_object (atk_gobj); + + if (obj == NULL) + { + /* item is defunct */ + return; + } + + /* Get the CanvasItem */ + item = EEL_CANVAS_ITEM (obj); + + /* If this item has no parent canvas, something's broken */ + g_return_if_fail (GTK_IS_WIDGET (item->canvas)); + + eel_canvas_item_accessible_get_item_extents (item, &rect); + *width = rect.width; + *height = rect.height; + if (!eel_canvas_item_accessible_is_item_in_window (item, &rect)) + { + *x = G_MININT; + *y = G_MININT; + return; + } + + canvas = GTK_WIDGET (item->canvas); + window = gtk_widget_get_parent_window (canvas); + gdk_window_get_origin (window, &window_x, &window_y); + *x = rect.x + window_x; + *y = rect.y + window_y; + if (coord_type == ATK_XY_WINDOW) + { + window = gdk_window_get_toplevel (gtk_widget_get_window (canvas)); + gdk_window_get_origin (window, &toplevel_x, &toplevel_y); + *x -= toplevel_x; + *y -= toplevel_y; + } + return; +} + +static gint +eel_canvas_item_accessible_get_mdi_zorder (AtkComponent *component) +{ + AtkGObjectAccessible *atk_gobj; + GObject *g_obj; + EelCanvasItem *item; + + atk_gobj = ATK_GOBJECT_ACCESSIBLE (component); + g_obj = atk_gobject_accessible_get_object (atk_gobj); + if (g_obj == NULL) + { + /* Object is defunct */ + return -1; + } + + item = EEL_CANVAS_ITEM (g_obj); + if (item->parent) + { + return g_list_index (EEL_CANVAS_GROUP (item->parent)->item_list, item); + } + else + { + g_return_val_if_fail (item->canvas->root == item, -1); + return 0; + } +} + +static gboolean +eel_canvas_item_accessible_grab_focus (AtkComponent *component) +{ + AtkGObjectAccessible *atk_gobj; + GObject *obj; + EelCanvasItem *item; + GtkWidget *toplevel; + + atk_gobj = ATK_GOBJECT_ACCESSIBLE (component); + obj = atk_gobject_accessible_get_object (atk_gobj); + + item = EEL_CANVAS_ITEM (obj); + if (item == NULL) + { + /* item is defunct */ + return FALSE; + } + + eel_canvas_item_grab_focus (item); + toplevel = gtk_widget_get_toplevel (GTK_WIDGET (item->canvas)); + if (gtk_widget_is_toplevel (toplevel)) + { + gtk_window_present (GTK_WINDOW (toplevel)); + } + + return TRUE; +} + +static void +eel_canvas_item_accessible_remove_focus_handler (AtkComponent *component, + guint handler_id) +{ + g_signal_handler_disconnect (component, handler_id); +} + +static void +eel_canvas_item_accessible_component_interface_init (AtkComponentIface *iface) +{ + g_return_if_fail (iface != NULL); + + iface->add_focus_handler = eel_canvas_item_accessible_add_focus_handler; + iface->get_extents = eel_canvas_item_accessible_get_extents; + iface->get_mdi_zorder = eel_canvas_item_accessible_get_mdi_zorder; + iface->grab_focus = eel_canvas_item_accessible_grab_focus; + iface->remove_focus_handler = eel_canvas_item_accessible_remove_focus_handler; +} + +static gboolean +eel_canvas_item_accessible_is_item_on_screen (EelCanvasItem *item) +{ + GdkRectangle rect; + + eel_canvas_item_accessible_get_item_extents (item, &rect); + return eel_canvas_item_accessible_is_item_in_window (item, &rect); +} + +static void +eel_canvas_item_accessible_initialize (AtkObject *obj, gpointer data) +{ + if (ATK_OBJECT_CLASS (accessible_item_parent_class)->initialize != NULL) + ATK_OBJECT_CLASS (accessible_item_parent_class)->initialize (obj, data); + g_object_set_data (G_OBJECT (obj), "atk-component-layer", + GINT_TO_POINTER (ATK_LAYER_MDI)); +} + +static AtkStateSet* +eel_canvas_item_accessible_ref_state_set (AtkObject *accessible) +{ + AtkGObjectAccessible *atk_gobj; + GObject *obj; + EelCanvasItem *item; + AtkStateSet *state_set; + + state_set = ATK_OBJECT_CLASS (accessible_item_parent_class)->ref_state_set (accessible); + atk_gobj = ATK_GOBJECT_ACCESSIBLE (accessible); + obj = atk_gobject_accessible_get_object (atk_gobj); + + item = EEL_CANVAS_ITEM (obj); + if (item == NULL) + { + atk_state_set_add_state (state_set, ATK_STATE_DEFUNCT); + } + else + { + if (item->flags & EEL_CANVAS_ITEM_VISIBLE) + { + atk_state_set_add_state (state_set, ATK_STATE_VISIBLE); + + if (eel_canvas_item_accessible_is_item_on_screen (item)) + { + atk_state_set_add_state (state_set, ATK_STATE_SHOWING); + } + } + if (gtk_widget_get_can_focus (GTK_WIDGET (item->canvas))) + { + atk_state_set_add_state (state_set, ATK_STATE_FOCUSABLE); + + if (item->canvas->focused_item == item) + { + atk_state_set_add_state (state_set, ATK_STATE_FOCUSED); + } + } + } + + return state_set; +} + +static void +eel_canvas_item_accessible_class_init (AtkObjectClass *klass) +{ + accessible_item_parent_class = g_type_class_peek_parent (klass); + + klass->initialize = eel_canvas_item_accessible_initialize; + klass->ref_state_set = eel_canvas_item_accessible_ref_state_set; +} + +static GType +eel_canvas_item_accessible_get_type (void) +{ + static GType type = 0; + + if (!type) + { + static const GInterfaceInfo atk_component_info = + { + (GInterfaceInitFunc) eel_canvas_item_accessible_component_interface_init, + (GInterfaceFinalizeFunc) NULL, + NULL + }; + AtkObjectFactory *factory; + GType parent_atk_type; + GTypeQuery query; + GTypeInfo tinfo = { 0 }; + + factory = atk_registry_get_factory (atk_get_default_registry(), + GTK_TYPE_OBJECT); + if (!factory) + { + return G_TYPE_INVALID; + } + parent_atk_type = atk_object_factory_get_accessible_type (factory); + if (!parent_atk_type) + { + return G_TYPE_INVALID; + } + g_type_query (parent_atk_type, &query); + tinfo.class_init = (GClassInitFunc) eel_canvas_item_accessible_class_init; + tinfo.class_size = query.class_size; + tinfo.instance_size = query.instance_size; + type = g_type_register_static (parent_atk_type, + "EelCanvasItemAccessibility", + &tinfo, 0); + + g_type_add_interface_static (type, ATK_TYPE_COMPONENT, + &atk_component_info); + + } + + return type; +} + +static AtkObject * +eel_canvas_item_accessible_create (GObject *for_object) +{ + GType type; + AtkObject *accessible; + EelCanvasItem *item; + + item = EEL_CANVAS_ITEM (for_object); + g_return_val_if_fail (item != NULL, NULL); + + type = eel_canvas_item_accessible_get_type (); + if (type == G_TYPE_INVALID) + { + return atk_no_op_object_new (for_object); + } + + accessible = g_object_new (type, NULL); + atk_object_initialize (accessible, for_object); + return accessible; +} + +static GType +eel_canvas_item_accessible_factory_get_accessible_type (void) +{ + return eel_canvas_item_accessible_get_type (); +} + +static AtkObject* +eel_canvas_item_accessible_factory_create_accessible (GObject *obj) +{ + AtkObject *accessible; + + g_return_val_if_fail (G_IS_OBJECT (obj), NULL); + + accessible = eel_canvas_item_accessible_create (obj); + + return accessible; +} + +static void +eel_canvas_item_accessible_factory_class_init (AtkObjectFactoryClass *klass) +{ + klass->create_accessible = eel_canvas_item_accessible_factory_create_accessible; + klass->get_accessible_type = eel_canvas_item_accessible_factory_get_accessible_type; +} + +static GType +eel_canvas_item_accessible_factory_get_type (void) +{ + static GType type = 0; + + if (!type) + { + static const GTypeInfo tinfo = + { + sizeof (AtkObjectFactoryClass), + (GBaseInitFunc) NULL, + (GBaseFinalizeFunc) NULL, + (GClassInitFunc) eel_canvas_item_accessible_factory_class_init, + NULL, /* class_finalize */ + NULL, /* class_data */ + sizeof (AtkObjectFactory), + 0, /* n_preallocs */ + NULL + }; + type = g_type_register_static (ATK_TYPE_OBJECT_FACTORY, + "EelCanvasItemAccessibilityFactory", + &tinfo, 0); + } + + return type; +} + +/* Class initialization function for EelCanvasItemClass */ +static void +eel_canvas_item_class_init (EelCanvasItemClass *klass) +{ + GObjectClass *gobject_class = (GObjectClass *) klass; + + item_parent_class = g_type_class_peek_parent (klass); + + gobject_class->set_property = eel_canvas_item_set_property; + gobject_class->get_property = eel_canvas_item_get_property; + gobject_class->dispose = eel_canvas_item_dispose; + + g_object_class_install_property + (gobject_class, ITEM_PROP_PARENT, + g_param_spec_object ("parent", NULL, NULL, + EEL_TYPE_CANVAS_ITEM, + G_PARAM_READWRITE)); + + g_object_class_install_property + (gobject_class, ITEM_PROP_VISIBLE, + g_param_spec_boolean ("visible", NULL, NULL, + TRUE, + G_PARAM_READWRITE)); + + item_signals[ITEM_EVENT] = + g_signal_new ("event", + G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, + G_STRUCT_OFFSET (EelCanvasItemClass, event), + boolean_handled_accumulator, NULL, + eel_marshal_BOOLEAN__BOXED, + G_TYPE_BOOLEAN, 1, + GDK_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE); + + klass->realize = eel_canvas_item_realize; + klass->unrealize = eel_canvas_item_unrealize; + klass->map = eel_canvas_item_map; + klass->unmap = eel_canvas_item_unmap; + klass->update = eel_canvas_item_update; + + atk_registry_set_factory_type (atk_get_default_registry (), + EEL_TYPE_CANVAS_ITEM, + eel_canvas_item_accessible_factory_get_type ()); +} |