/* -*- Mode: C; tab-width: 8; indent-tabs-mode: 8; c-basic-offset: 8 -*- */ /* * Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation * All rights reserved. * * This file is part of the Gnome Library. * * The Gnome Library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * The Gnome Library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with the Gnome Library; see the file COPYING.LIB. If not, * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* @NOTATION@ */ /* * GnomeCanvas widget - Tk-like canvas widget for Gnome * * GnomeCanvas is basically a port of the Tk toolkit's most excellent canvas widget. Tk is * copyrighted by the Regents of the University of California, Sun Microsystems, and other parties. * * * Authors: Federico Mena * Raph Levien */ /* * TO-DO list for the canvas: * * - Allow to specify whether GnomeCanvasImage sizes are in units or pixels (scale or don't scale). * * - Implement a flag for gnome_canvas_item_reparent() that tells the function to keep the item * visually in the same place, that is, to keep it in the same place with respect to the canvas * origin. * * - GC put functions for items. * * - Widget item (finish it). * * - GList *gnome_canvas_gimme_all_items_contained_in_this_area (GnomeCanvas *canvas, Rectangle area); * * - Retrofit all the primitive items with microtile support. * * - Curve support for line item. * * - Arc item (Havoc has it; to be integrated in GnomeCanvasEllipse). * * - Sane font handling API. * * - Get_arg methods for items: * - How to fetch the outline width and know whether it is in pixels or units? */ /* * Raph's TODO list for the antialiased canvas integration: * * - ::point() method for text item not accurate when affine transformed. * * - Clip rectangle not implemented in aa renderer for text item. * * - Clip paths only partially implemented. * * - Add more image loading techniques to work around imlib deficiencies. */ #include #include #include #include #include #include #include #include "gnome-canvas.h" #include "gnome-canvas-i18n.h" #include "libart_lgpl/art_rect.h" #include "libart_lgpl/art_rect_uta.h" #include "libart_lgpl/art_uta_rect.h" #include "libart_lgpl/art_uta_ops.h" #include "gnome-canvas-marshal.h" #include "gnome-canvas-marshal.c" /* We must run our idle update handler *before* GDK wants to redraw. */ #define CANVAS_IDLE_PRIORITY (GDK_PRIORITY_REDRAW - 5) static void gnome_canvas_request_update (GnomeCanvas *canvas); static void group_add (GnomeCanvasGroup *group, GnomeCanvasItem *item); static void group_remove (GnomeCanvasGroup *group, GnomeCanvasItem *item); static void add_idle (GnomeCanvas *canvas); /*** GnomeCanvasItem ***/ /* Some convenience stuff */ #define GCI_UPDATE_MASK (GNOME_CANVAS_UPDATE_REQUESTED | GNOME_CANVAS_UPDATE_AFFINE | GNOME_CANVAS_UPDATE_CLIP | GNOME_CANVAS_UPDATE_VISIBILITY) #define GCI_EPSILON 1e-18 #define GCI_PRINT_MATRIX(s,a) g_print ("%s %g %g %g %g %g %g\n", s, (a)[0], (a)[1], (a)[2], (a)[3], (a)[4], (a)[5]) enum { ITEM_PROP_0, ITEM_PROP_PARENT }; enum { ITEM_EVENT, ITEM_LAST_SIGNAL }; static void gnome_canvas_item_class_init (GnomeCanvasItemClass *class); static void gnome_canvas_item_init (GnomeCanvasItem *item); static int emit_event (GnomeCanvas *canvas, GdkEvent *event); static guint item_signals[ITEM_LAST_SIGNAL]; static GtkObjectClass *item_parent_class; /** * gnome_canvas_item_get_type: * * Registers the &GnomeCanvasItem class if necessary, and returns the type ID * associated to it. * * Return value: The type ID of the &GnomeCanvasItem class. **/ GType gnome_canvas_item_get_type (void) { static GType canvas_item_type; if (!canvas_item_type) { static const GTypeInfo object_info = { sizeof (GnomeCanvasItemClass), (GBaseInitFunc) NULL, (GBaseFinalizeFunc) NULL, (GClassInitFunc) gnome_canvas_item_class_init, (GClassFinalizeFunc) NULL, NULL, /* class_data */ sizeof (GnomeCanvasItem), 0, /* n_preallocs */ (GInstanceInitFunc) gnome_canvas_item_init, NULL /* value_table */ }; canvas_item_type = g_type_register_static (GTK_TYPE_OBJECT, "GnomeCanvasItem", &object_info, 0); } return canvas_item_type; } /* Object initialization function for GnomeCanvasItem */ static void gnome_canvas_item_init (GnomeCanvasItem *item) { item->object.flags |= GNOME_CANVAS_ITEM_VISIBLE; } /** * gnome_canvas_item_new: * @parent: The parent group for the new item. * @type: The object type of the item. * @first_arg_name: A list of object argument name/value pairs, NULL-terminated, * used to configure the item. For example, "fill_color", "black", * "width_units", 5.0, NULL. * @Varargs: * * Creates a new canvas item with @parent as its parent group. The item is * created at the top of its parent's stack, and starts up as visible. The item * is of the specified @type, for example, it can be * gnome_canvas_rect_get_type(). The list of object arguments/value pairs is * used to configure the item. If you need to pass construct time parameters, you * should use g_object_new() to pass the parameters and * gnome_canvas_item_construct() to set up the canvas item. * * Return value: The newly-created item. **/ GnomeCanvasItem * gnome_canvas_item_new (GnomeCanvasGroup *parent, GType type, const gchar *first_arg_name, ...) { GnomeCanvasItem *item; va_list args; g_return_val_if_fail (GNOME_IS_CANVAS_GROUP (parent), NULL); g_return_val_if_fail (g_type_is_a (type, gnome_canvas_item_get_type ()), NULL); item = GNOME_CANVAS_ITEM (g_object_new (type, NULL)); va_start (args, first_arg_name); gnome_canvas_item_construct (item, parent, first_arg_name, args); va_end (args); return item; } /* Performs post-creation operations on a canvas item (adding it to its parent * group, etc.) */ static void item_post_create_setup (GnomeCanvasItem *item) { group_add (GNOME_CANVAS_GROUP (item->parent), item); gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2 + 1, item->y2 + 1); item->canvas->need_repick = TRUE; } /* Set_property handler for canvas items */ static void gnome_canvas_item_set_property (GObject *gobject, guint param_id, const GValue *value, GParamSpec *pspec) { GnomeCanvasItem *item; g_return_if_fail (GNOME_IS_CANVAS_ITEM (gobject)); item = GNOME_CANVAS_ITEM (gobject); switch (param_id) { case ITEM_PROP_PARENT: if (item->parent != NULL) { g_warning ("Cannot set `parent' argument after item has " "already been constructed."); } else if (g_value_get_object (value)) { item->parent = GNOME_CANVAS_ITEM (g_value_get_object (value)); item->canvas = item->parent->canvas; item_post_create_setup (item); } break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec); break; } } /* Get_property handler for canvas items */ static void gnome_canvas_item_get_property (GObject *gobject, guint param_id, GValue *value, GParamSpec *pspec) { GnomeCanvasItem *item; g_return_if_fail (GNOME_IS_CANVAS_ITEM (gobject)); item = GNOME_CANVAS_ITEM (gobject); switch (param_id) { case ITEM_PROP_PARENT: g_value_set_object (value, item->parent); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec); break; } } /** * gnome_canvas_item_construct: * @item: An unconstructed canvas item. * @parent: The parent group for the item. * @first_arg_name: The name of the first argument for configuring the item. * @args: The list of arguments used to configure the item. * * Constructs a canvas item; meant for use only by item implementations. **/ void gnome_canvas_item_construct (GnomeCanvasItem *item, GnomeCanvasGroup *parent, const gchar *first_arg_name, va_list args) { g_return_if_fail (GNOME_IS_CANVAS_GROUP (parent)); g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); item->parent = GNOME_CANVAS_ITEM (parent); item->canvas = item->parent->canvas; g_object_set_valist (G_OBJECT (item), first_arg_name, args); item_post_create_setup (item); } /* If the item is visible, requests a redraw of it. */ static void redraw_if_visible (GnomeCanvasItem *item) { if (item->object.flags & GNOME_CANVAS_ITEM_VISIBLE) gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2 + 1, item->y2 + 1); } /* Standard object dispose function for canvas items */ static void gnome_canvas_item_dispose (GObject *object) { GnomeCanvasItem *item; g_return_if_fail (GNOME_IS_CANVAS_ITEM (object)); item = GNOME_CANVAS_ITEM (object); if (item->canvas) redraw_if_visible (item); /* Make the canvas forget about us */ if (item->canvas && item == item->canvas->current_item) { item->canvas->current_item = NULL; item->canvas->need_repick = TRUE; } if (item->canvas && item == item->canvas->new_current_item) { item->canvas->new_current_item = NULL; item->canvas->need_repick = TRUE; } if (item->canvas && item == item->canvas->grabbed_item) { item->canvas->grabbed_item = NULL; gdk_pointer_ungrab (GDK_CURRENT_TIME); } if (item->canvas && item == item->canvas->focused_item) item->canvas->focused_item = NULL; /* Normal destroy stuff */ if (item->object.flags & GNOME_CANVAS_ITEM_MAPPED) (* GNOME_CANVAS_ITEM_GET_CLASS (item)->unmap) (item); if (item->object.flags & GNOME_CANVAS_ITEM_REALIZED) (* GNOME_CANVAS_ITEM_GET_CLASS (item)->unrealize) (item); if (item->parent) group_remove (GNOME_CANVAS_GROUP (item->parent), item); g_free (item->xform); item->xform = NULL; G_OBJECT_CLASS (item_parent_class)->dispose (object); /* items should remove any reference to item->canvas after the first ::destroy */ item->canvas = NULL; } /* Realize handler for canvas items */ static void gnome_canvas_item_realize (GnomeCanvasItem *item) { GTK_OBJECT_SET_FLAGS (item, GNOME_CANVAS_ITEM_REALIZED); gnome_canvas_item_request_update (item); } /* Unrealize handler for canvas items */ static void gnome_canvas_item_unrealize (GnomeCanvasItem *item) { GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_REALIZED); } /* Map handler for canvas items */ static void gnome_canvas_item_map (GnomeCanvasItem *item) { GTK_OBJECT_SET_FLAGS (item, GNOME_CANVAS_ITEM_MAPPED); } /* Unmap handler for canvas items */ static void gnome_canvas_item_unmap (GnomeCanvasItem *item) { GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_MAPPED); } /* Update handler for canvas items */ static void gnome_canvas_item_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags) { GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_NEED_UPDATE); GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_NEED_AFFINE); GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_NEED_CLIP); GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_NEED_VIS); } #define noHACKISH_AFFINE /* * This routine invokes the update method of the item * Please notice, that we take parent to canvas pixel matrix as argument * unlike virtual method ::update, whose argument is item 2 canvas pixel * matrix * * I will try to force somewhat meaningful naming for affines (Lauris) * General naming rule is FROM2TO, where FROM and TO are abbreviations * So p2cpx is Parent2CanvasPixel and i2cpx is Item2CanvasPixel * I hope that this helps to keep track of what really happens * */ static void gnome_canvas_item_invoke_update (GnomeCanvasItem *item, double *p2cpx, ArtSVP *clip_path, int flags) { int child_flags; gdouble i2cpx[6]; #ifdef HACKISH_AFFINE double i2w[6], w2c[6], i2c[6]; #endif child_flags = flags; if (!(item->object.flags & GNOME_CANVAS_ITEM_VISIBLE)) child_flags &= ~GNOME_CANVAS_UPDATE_IS_VISIBLE; /* Calculate actual item transformation matrix */ if (item->xform) { if (item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL) { /* Item has full affine */ art_affine_multiply (i2cpx, item->xform, p2cpx); } else { /* Item has only translation */ memcpy (i2cpx, p2cpx, 4 * sizeof (gdouble)); i2cpx[4] = item->xform[0] * p2cpx[0] + item->xform[1] * p2cpx[2] + p2cpx[4]; i2cpx[5] = item->xform[0] * p2cpx[1] + item->xform[1] * p2cpx[3] + p2cpx[5]; } } else { /* Item has no matrix (i.e. identity) */ memcpy (i2cpx, p2cpx, 6 * sizeof (gdouble)); } #ifdef HACKISH_AFFINE gnome_canvas_item_i2w_affine (item, i2w); gnome_canvas_w2c_affine (item->canvas, w2c); art_affine_multiply (i2c, i2w, w2c); /* invariant (doesn't hold now): child_affine == i2c */ child_affine = i2c; #endif /* apply object flags to child flags */ child_flags &= ~GNOME_CANVAS_UPDATE_REQUESTED; if (item->object.flags & GNOME_CANVAS_ITEM_NEED_UPDATE) child_flags |= GNOME_CANVAS_UPDATE_REQUESTED; if (item->object.flags & GNOME_CANVAS_ITEM_NEED_AFFINE) child_flags |= GNOME_CANVAS_UPDATE_AFFINE; if (item->object.flags & GNOME_CANVAS_ITEM_NEED_CLIP) child_flags |= GNOME_CANVAS_UPDATE_CLIP; if (item->object.flags & GNOME_CANVAS_ITEM_NEED_VIS) child_flags |= GNOME_CANVAS_UPDATE_VISIBILITY; if (child_flags & GCI_UPDATE_MASK) { if (GNOME_CANVAS_ITEM_GET_CLASS (item)->update) GNOME_CANVAS_ITEM_GET_CLASS (item)->update (item, i2cpx, clip_path, child_flags); } } /* * This routine invokes the point method of the item. * The arguments x, y should be in the parent item local coordinates. * * This is potentially evil, as we are relying on matrix inversion (Lauris) */ static double gnome_canvas_item_invoke_point (GnomeCanvasItem *item, double x, double y, int cx, int cy, GnomeCanvasItem **actual_item) { /* Calculate x & y in item local coordinates */ if (item->xform) { if (item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL) { gdouble p2i[6], t; /* Item has full affine */ art_affine_invert (p2i, item->xform); t = x * p2i[0] + y * p2i[2] + p2i[4]; y = x * p2i[1] + y * p2i[3] + p2i[5]; x = t; } else { /* Item has only translation */ x -= item->xform[0]; y -= item->xform[1]; } } #ifdef HACKISH_AFFINE double i2w[6], w2c[6], i2c[6], c2i[6]; ArtPoint c, i; #endif #ifdef HACKISH_AFFINE gnome_canvas_item_i2w_affine (item, i2w); gnome_canvas_w2c_affine (item->canvas, w2c); art_affine_multiply (i2c, i2w, w2c); art_affine_invert (c2i, i2c); c.x = cx; c.y = cy; art_affine_point (&i, &c, c2i); x = i.x; y = i.y; #endif if (GNOME_CANVAS_ITEM_GET_CLASS (item)->point) return GNOME_CANVAS_ITEM_GET_CLASS (item)->point (item, x, y, cx, cy, actual_item); return 1e18; } /** * gnome_canvas_item_set: * @item: A canvas item. * @first_arg_name: The list of object argument name/value pairs used to configure the item. * @Varargs: * * Configures a canvas item. The arguments in the item are set to the specified * values, and the item is repainted as appropriate. **/ void gnome_canvas_item_set (GnomeCanvasItem *item, const gchar *first_arg_name, ...) { va_list args; va_start (args, first_arg_name); gnome_canvas_item_set_valist (item, first_arg_name, args); va_end (args); } /** * gnome_canvas_item_set_valist: * @item: A canvas item. * @first_arg_name: The name of the first argument used to configure the item. * @args: The list of object argument name/value pairs used to configure the item. * * Configures a canvas item. The arguments in the item are set to the specified * values, and the item is repainted as appropriate. **/ void gnome_canvas_item_set_valist (GnomeCanvasItem *item, const gchar *first_arg_name, va_list args) { g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); g_object_set_valist (G_OBJECT (item), first_arg_name, args); #if 0 /* I commented this out, because item implementations have to schedule update/redraw */ redraw_if_visible (item); #endif item->canvas->need_repick = TRUE; } /** * gnome_canvas_item_affine_relative: * @item: A canvas item. * @affine: An affine transformation matrix. * * Combines the specified affine transformation matrix with the item's current * transformation. NULL affine is not allowed. **/ #define GCIAR_EPSILON 1e-6 void gnome_canvas_item_affine_relative (GnomeCanvasItem *item, const double affine[6]) { gdouble i2p[6]; g_return_if_fail (item != NULL); g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); g_return_if_fail (affine != NULL); /* Calculate actual item transformation matrix */ if (item->xform) { if (item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL) { /* Item has full affine */ art_affine_multiply (i2p, affine, item->xform); } else { /* Item has only translation */ memcpy (i2p, affine, 6 * sizeof (gdouble)); i2p[4] += item->xform[0]; i2p[5] += item->xform[1]; } } else { /* Item has no matrix (i.e. identity) */ memcpy (i2p, affine, 6 * sizeof (gdouble)); } gnome_canvas_item_affine_absolute (item, i2p); } /** * gnome_canvas_item_affine_absolute: * @item: A canvas item. * @affine: An affine transformation matrix. * * Makes the item's affine transformation matrix be equal to the specified * matrix. NULL affine is treated as identity. **/ void gnome_canvas_item_affine_absolute (GnomeCanvasItem *item, const double i2p[6]) { g_return_if_fail (item != NULL); g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); if (i2p && (fabs (i2p[0] - 1.0) < GCI_EPSILON) && (fabs (i2p[1] - 0.0) < GCI_EPSILON) && (fabs (i2p[2] - 0.0) < GCI_EPSILON) && (fabs (i2p[3] - 1.0) < GCI_EPSILON) && (fabs (i2p[4] - 0.0) < GCI_EPSILON) && (fabs (i2p[5] - 0.0) < GCI_EPSILON)) { /* We are identity */ i2p = NULL; } if (i2p) { if (item->xform && !(item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL)) { /* We do not want to deal with translation-only affines */ g_free (item->xform); item->xform = NULL; } if (!item->xform) item->xform = g_new (gdouble, 6); memcpy (item->xform, i2p, 6 * sizeof (gdouble)); item->object.flags |= GNOME_CANVAS_ITEM_AFFINE_FULL; } else { if (item->xform) { g_free (item->xform); item->xform = NULL; } } if (!(item->object.flags & GNOME_CANVAS_ITEM_NEED_AFFINE)) { /* Request update */ item->object.flags |= GNOME_CANVAS_ITEM_NEED_AFFINE; gnome_canvas_item_request_update (item); } item->canvas->need_repick = TRUE; } /** * gnome_canvas_item_move: * @item: A canvas item. * @dx: Horizontal offset. * @dy: Vertical offset. * * Moves a canvas item by creating an affine transformation matrix for * translation by using the specified values. This happens in item * local coordinate system, so if you have nontrivial transform, it * most probably does not do, what you want. **/ void gnome_canvas_item_move (GnomeCanvasItem *item, double dx, double dy) { double translate[6]; g_return_if_fail (item != NULL); g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); art_affine_translate (translate, dx, dy); gnome_canvas_item_affine_relative (item, translate); } /* Convenience function to reorder items in a group's child list. This puts the * specified link after the "before" link. Returns TRUE if the list was changed. */ static gboolean put_item_after (GList *link, GList *before) { GnomeCanvasGroup *parent; GList *old_before, *old_after; GList *after; parent = GNOME_CANVAS_GROUP (GNOME_CANVAS_ITEM (link->data)->parent); if (before) after = before->next; else after = parent->item_list; if (before == link || after == link) return FALSE; /* Unlink */ old_before = link->prev; old_after = link->next; if (old_before) old_before->next = old_after; else parent->item_list = old_after; if (old_after) old_after->prev = old_before; else parent->item_list_end = old_before; /* Relink */ link->prev = before; if (before) before->next = link; else parent->item_list = link; link->next = after; if (after) after->prev = link; else parent->item_list_end = link; return TRUE; } /** * gnome_canvas_item_raise: * @item: A canvas item. * @positions: Number of steps to raise the item. * * Raises the item in its parent's stack by the specified number of positions. * If the number of positions is greater than the distance to the top of the * stack, then the item is put at the top. **/ void gnome_canvas_item_raise (GnomeCanvasItem *item, int positions) { GList *link, *before; GnomeCanvasGroup *parent; g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); g_return_if_fail (positions >= 0); if (!item->parent || positions == 0) return; parent = GNOME_CANVAS_GROUP (item->parent); link = g_list_find (parent->item_list, item); g_assert (link != NULL); for (before = link; positions && before; positions--) before = before->next; if (!before) before = parent->item_list_end; if (put_item_after (link, before)) { redraw_if_visible (item); item->canvas->need_repick = TRUE; } } /** * gnome_canvas_item_lower: * @item: A canvas item. * @positions: Number of steps to lower the item. * * Lowers the item in its parent's stack by the specified number of positions. * If the number of positions is greater than the distance to the bottom of the * stack, then the item is put at the bottom. **/ void gnome_canvas_item_lower (GnomeCanvasItem *item, int positions) { GList *link, *before; GnomeCanvasGroup *parent; g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); g_return_if_fail (positions >= 1); if (!item->parent || positions == 0) return; parent = GNOME_CANVAS_GROUP (item->parent); link = g_list_find (parent->item_list, item); g_assert (link != NULL); if (link->prev) for (before = link->prev; positions && before; positions--) before = before->prev; else before = NULL; if (put_item_after (link, before)) { redraw_if_visible (item); item->canvas->need_repick = TRUE; } } /** * gnome_canvas_item_raise_to_top: * @item: A canvas item. * * Raises an item to the top of its parent's stack. **/ void gnome_canvas_item_raise_to_top (GnomeCanvasItem *item) { GList *link; GnomeCanvasGroup *parent; g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); if (!item->parent) return; parent = GNOME_CANVAS_GROUP (item->parent); link = g_list_find (parent->item_list, item); g_assert (link != NULL); if (put_item_after (link, parent->item_list_end)) { redraw_if_visible (item); item->canvas->need_repick = TRUE; } } /** * gnome_canvas_item_lower_to_bottom: * @item: A canvas item. * * Lowers an item to the bottom of its parent's stack. **/ void gnome_canvas_item_lower_to_bottom (GnomeCanvasItem *item) { GList *link; GnomeCanvasGroup *parent; g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); if (!item->parent) return; parent = GNOME_CANVAS_GROUP (item->parent); link = g_list_find (parent->item_list, item); g_assert (link != NULL); if (put_item_after (link, NULL)) { redraw_if_visible (item); item->canvas->need_repick = TRUE; } } /** * gnome_canvas_item_show: * @item: A canvas item. * * Shows a canvas item. If the item was already shown, then no action is taken. **/ void gnome_canvas_item_show (GnomeCanvasItem *item) { g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); if (!(item->object.flags & GNOME_CANVAS_ITEM_VISIBLE)) { item->object.flags |= GNOME_CANVAS_ITEM_VISIBLE; gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2 + 1, item->y2 + 1); item->canvas->need_repick = TRUE; } } /** * gnome_canvas_item_hide: * @item: A canvas item. * * Hides a canvas item. If the item was already hidden, then no action is * taken. **/ void gnome_canvas_item_hide (GnomeCanvasItem *item) { g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); if (item->object.flags & GNOME_CANVAS_ITEM_VISIBLE) { item->object.flags &= ~GNOME_CANVAS_ITEM_VISIBLE; gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2 + 1, item->y2 + 1); item->canvas->need_repick = TRUE; } } /** * gnome_canvas_item_grab: * @item: A canvas item. * @event_mask: Mask of events that will be sent to this item. * @cursor: If non-NULL, the cursor that will be used while the grab is active. * @etime: The timestamp required for grabbing the mouse, or GDK_CURRENT_TIME. * * Specifies that all events that match the specified event mask should be sent * to the specified item, and also grabs the mouse by calling * gdk_pointer_grab(). The event mask is also used when grabbing the pointer. * If @cursor is not NULL, then that cursor is used while the grab is active. * The @etime parameter is the timestamp required for grabbing the mouse. * * Return value: If an item was already grabbed, it returns %GDK_GRAB_ALREADY_GRABBED. If * the specified item was hidden by calling gnome_canvas_item_hide(), then it * returns %GDK_GRAB_NOT_VIEWABLE. Else, it returns the result of calling * gdk_pointer_grab(). **/ int gnome_canvas_item_grab (GnomeCanvasItem *item, guint event_mask, GdkCursor *cursor, guint32 etime) { int retval; g_return_val_if_fail (GNOME_IS_CANVAS_ITEM (item), GDK_GRAB_NOT_VIEWABLE); g_return_val_if_fail (GTK_WIDGET_MAPPED (item->canvas), GDK_GRAB_NOT_VIEWABLE); if (item->canvas->grabbed_item) return GDK_GRAB_ALREADY_GRABBED; if (!(item->object.flags & GNOME_CANVAS_ITEM_VISIBLE)) return GDK_GRAB_NOT_VIEWABLE; retval = gdk_pointer_grab (item->canvas->layout.bin_window, FALSE, event_mask, NULL, cursor, etime); if (retval != GDK_GRAB_SUCCESS) return retval; item->canvas->grabbed_item = item; item->canvas->grabbed_event_mask = event_mask; item->canvas->current_item = item; /* So that events go to the grabbed item */ return retval; } /** * gnome_canvas_item_ungrab: * @item: A canvas item that holds a grab. * @etime: The timestamp for ungrabbing the mouse. * * Ungrabs the item, which must have been grabbed in the canvas, and ungrabs the * mouse. **/ void gnome_canvas_item_ungrab (GnomeCanvasItem *item, guint32 etime) { g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); if (item->canvas->grabbed_item != item) return; item->canvas->grabbed_item = NULL; gdk_pointer_ungrab (etime); } /** * gnome_canvas_item_i2w_affine: * @item: A canvas item * @affine: An affine transformation matrix (return value). * * Gets the affine transform that converts from the item's coordinate system to * world coordinates. **/ void gnome_canvas_item_i2w_affine (GnomeCanvasItem *item, double affine[6]) { g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); g_return_if_fail (affine != NULL); art_affine_identity (affine); while (item) { if (item->xform != NULL) { if (item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL) { art_affine_multiply (affine, affine, item->xform); } else { affine[4] += item->xform[0]; affine[5] += item->xform[1]; } } item = item->parent; } } /** * gnome_canvas_item_w2i: * @item: A canvas item. * @x: X coordinate to convert (input/output value). * @y: Y coordinate to convert (input/output value). * * Converts a coordinate pair from world coordinates to item-relative * coordinates. **/ void gnome_canvas_item_w2i (GnomeCanvasItem *item, double *x, double *y) { double affine[6], inv[6]; ArtPoint w, i; g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); g_return_if_fail (x != NULL); g_return_if_fail (y != NULL); gnome_canvas_item_i2w_affine (item, affine); art_affine_invert (inv, affine); w.x = *x; w.y = *y; art_affine_point (&i, &w, inv); *x = i.x; *y = i.y; } /** * gnome_canvas_item_i2w: * @item: A canvas item. * @x: X coordinate to convert (input/output value). * @y: Y coordinate to convert (input/output value). * * Converts a coordinate pair from item-relative coordinates to world * coordinates. **/ void gnome_canvas_item_i2w (GnomeCanvasItem *item, double *x, double *y) { double affine[6]; ArtPoint w, i; g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); g_return_if_fail (x != NULL); g_return_if_fail (y != NULL); gnome_canvas_item_i2w_affine (item, affine); i.x = *x; i.y = *y; art_affine_point (&w, &i, affine); *x = w.x; *y = w.y; } /** * gnome_canvas_item_i2c_affine: * @item: A canvas item. * @affine: An affine transformation matrix (return value). * * Gets the affine transform that converts from item-relative coordinates to * canvas pixel coordinates. **/ void gnome_canvas_item_i2c_affine (GnomeCanvasItem *item, double affine[6]) { double i2w[6], w2c[6]; gnome_canvas_item_i2w_affine (item, i2w); gnome_canvas_w2c_affine (item->canvas, w2c); art_affine_multiply (affine, i2w, w2c); } /* Returns whether the item is an inferior of or is equal to the parent. */ static int is_descendant (GnomeCanvasItem *item, GnomeCanvasItem *parent) { for (; item; item = item->parent) if (item == parent) return TRUE; return FALSE; } /** * gnome_canvas_item_reparent: * @item: A canvas item. * @new_group: A canvas group. * * Changes the parent of the specified item to be the new group. The item keeps * its group-relative coordinates as for its old parent, so the item may change * its absolute position within the canvas. **/ void gnome_canvas_item_reparent (GnomeCanvasItem *item, GnomeCanvasGroup *new_group) { g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); g_return_if_fail (GNOME_IS_CANVAS_GROUP (new_group)); /* Both items need to be in the same canvas */ g_return_if_fail (item->canvas == GNOME_CANVAS_ITEM (new_group)->canvas); /* The group cannot be an inferior of the item or be the item itself -- * this also takes care of the case where the item is the root item of * the canvas. */ g_return_if_fail (!is_descendant (GNOME_CANVAS_ITEM (new_group), item)); /* Everything is ok, now actually reparent the item */ g_object_ref (G_OBJECT (item)); /* protect it from the unref in group_remove */ redraw_if_visible (item); group_remove (GNOME_CANVAS_GROUP (item->parent), item); item->parent = GNOME_CANVAS_ITEM (new_group); group_add (new_group, item); /* Redraw and repick */ redraw_if_visible (item); item->canvas->need_repick = TRUE; g_object_unref (G_OBJECT (item)); } /** * gnome_canvas_item_grab_focus: * @item: A canvas item. * * Makes the specified item take the keyboard focus, so all keyboard events will * be sent to it. If the canvas widget itself did not have the focus, it grabs * it as well. **/ void gnome_canvas_item_grab_focus (GnomeCanvasItem *item) { GnomeCanvasItem *focused_item; GdkEvent ev; g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); g_return_if_fail (GTK_WIDGET_CAN_FOCUS (GTK_WIDGET (item->canvas))); focused_item = item->canvas->focused_item; if (focused_item) { ev.focus_change.type = GDK_FOCUS_CHANGE; ev.focus_change.window = GTK_LAYOUT (item->canvas)->bin_window; ev.focus_change.send_event = FALSE; ev.focus_change.in = FALSE; emit_event (item->canvas, &ev); } item->canvas->focused_item = item; gtk_widget_grab_focus (GTK_WIDGET (item->canvas)); if (focused_item) { ev.focus_change.type = GDK_FOCUS_CHANGE; ev.focus_change.window = GTK_LAYOUT (item->canvas)->bin_window; ev.focus_change.send_event = FALSE; ev.focus_change.in = TRUE; emit_event (item->canvas, &ev); } } /** * gnome_canvas_item_get_bounds: * @item: A canvas item. * @x1: Leftmost edge of the bounding box (return value). * @y1: Upper edge of the bounding box (return value). * @x2: Rightmost edge of the bounding box (return value). * @y2: Lower edge of the bounding box (return value). * * Queries the bounding box of a canvas item. The bounds are returned in the * coordinate system of the item's parent. **/ void gnome_canvas_item_get_bounds (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2) { double tx1, ty1, tx2, ty2; ArtPoint p1, p2, p3, p4; ArtPoint q1, q2, q3, q4; double min_x1, min_y1, min_x2, min_y2; double max_x1, max_y1, max_x2, max_y2; g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); tx1 = ty1 = tx2 = ty2 = 0.0; /* Get the item's bounds in its coordinate system */ if (GNOME_CANVAS_ITEM_GET_CLASS (item)->bounds) (* GNOME_CANVAS_ITEM_GET_CLASS (item)->bounds) (item, &tx1, &ty1, &tx2, &ty2); /* Make the bounds relative to the item's parent coordinate system */ if (item->xform && (item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL)) { p1.x = p2.x = tx1; p1.y = p4.y = ty1; p3.x = p4.x = tx2; p2.y = p3.y = ty2; art_affine_point (&q1, &p1, item->xform); art_affine_point (&q2, &p2, item->xform); art_affine_point (&q3, &p3, item->xform); art_affine_point (&q4, &p4, item->xform); if (q1.x < q2.x) { min_x1 = q1.x; max_x1 = q2.x; } else { min_x1 = q2.x; max_x1 = q1.x; } if (q1.y < q2.y) { min_y1 = q1.y; max_y1 = q2.y; } else { min_y1 = q2.y; max_y1 = q1.y; } if (q3.x < q4.x) { min_x2 = q3.x; max_x2 = q4.x; } else { min_x2 = q4.x; max_x2 = q3.x; } if (q3.y < q4.y) { min_y2 = q3.y; max_y2 = q4.y; } else { min_y2 = q4.y; max_y2 = q3.y; } tx1 = MIN (min_x1, min_x2); ty1 = MIN (min_y1, min_y2); tx2 = MAX (max_x1, max_x2); ty2 = MAX (max_y1, max_y2); } else if (item->xform) { tx1 += item->xform[0]; ty1 += item->xform[1]; tx2 += item->xform[0]; ty2 += item->xform[1]; } /* Return the values */ if (x1) *x1 = tx1; if (y1) *y1 = ty1; if (x2) *x2 = tx2; if (y2) *y2 = ty2; } /** * gnome_canvas_item_request_update * @item: A canvas item. * * To be used only by item implementations. Requests that the canvas queue an * update for the specified item. **/ void gnome_canvas_item_request_update (GnomeCanvasItem *item) { if (item->object.flags & GNOME_CANVAS_ITEM_NEED_UPDATE) return; item->object.flags |= GNOME_CANVAS_ITEM_NEED_UPDATE; if (item->parent != NULL) { /* Recurse up the tree */ gnome_canvas_item_request_update (item->parent); } else { /* Have reached the top of the tree, make sure the update call gets scheduled. */ gnome_canvas_request_update (item->canvas); } } /*** GnomeCanvasGroup ***/ enum { GROUP_PROP_0, GROUP_PROP_X, GROUP_PROP_Y }; static void gnome_canvas_group_class_init (GnomeCanvasGroupClass *class); static void gnome_canvas_group_init (GnomeCanvasGroup *group); static void gnome_canvas_group_set_property(GObject *object, guint param_id, const GValue *value, GParamSpec *pspec); static void gnome_canvas_group_get_property(GObject *object, guint param_id, GValue *value, GParamSpec *pspec); static void gnome_canvas_group_destroy (GtkObject *object); static void gnome_canvas_group_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags); static void gnome_canvas_group_realize (GnomeCanvasItem *item); static void gnome_canvas_group_unrealize (GnomeCanvasItem *item); static void gnome_canvas_group_map (GnomeCanvasItem *item); static void gnome_canvas_group_unmap (GnomeCanvasItem *item); static void gnome_canvas_group_draw (GnomeCanvasItem *item, GdkDrawable *drawable, int x, int y, int width, int height); static double gnome_canvas_group_point (GnomeCanvasItem *item, double x, double y, int cx, int cy, GnomeCanvasItem **actual_item); static void gnome_canvas_group_bounds (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2); static void gnome_canvas_group_render (GnomeCanvasItem *item, GnomeCanvasBuf *buf); static GnomeCanvasItemClass *group_parent_class; /** * gnome_canvas_group_get_type: * * Registers the &GnomeCanvasGroup class if necessary, and returns the type ID * associated to it. * * Return value: The type ID of the &GnomeCanvasGroup class. **/ GType gnome_canvas_group_get_type (void) { static GType canvas_group_type; if (!canvas_group_type) { static const GTypeInfo object_info = { sizeof (GnomeCanvasGroupClass), (GBaseInitFunc) NULL, (GBaseFinalizeFunc) NULL, (GClassInitFunc) gnome_canvas_group_class_init, (GClassFinalizeFunc) NULL, NULL, /* class_data */ sizeof (GnomeCanvasGroup), 0, /* n_preallocs */ (GInstanceInitFunc) gnome_canvas_group_init, NULL /* value_table */ }; canvas_group_type = g_type_register_static (GNOME_TYPE_CANVAS_ITEM, "GnomeCanvasGroup", &object_info, 0); } return canvas_group_type; } /* Class initialization function for GnomeCanvasGroupClass */ static void gnome_canvas_group_class_init (GnomeCanvasGroupClass *class) { GObjectClass *gobject_class; GtkObjectClass *object_class; GnomeCanvasItemClass *item_class; gobject_class = (GObjectClass *) class; object_class = (GtkObjectClass *) class; item_class = (GnomeCanvasItemClass *) class; group_parent_class = g_type_class_peek_parent (class); gobject_class->set_property = gnome_canvas_group_set_property; gobject_class->get_property = gnome_canvas_group_get_property; g_object_class_install_property (gobject_class, GROUP_PROP_X, g_param_spec_double ("x", "X", "X", -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, (G_PARAM_READABLE | G_PARAM_WRITABLE))); g_object_class_install_property (gobject_class, GROUP_PROP_Y, g_param_spec_double ("y", "Y", "Y", -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, (G_PARAM_READABLE | G_PARAM_WRITABLE))); object_class->destroy = gnome_canvas_group_destroy; item_class->update = gnome_canvas_group_update; item_class->realize = gnome_canvas_group_realize; item_class->unrealize = gnome_canvas_group_unrealize; item_class->map = gnome_canvas_group_map; item_class->unmap = gnome_canvas_group_unmap; item_class->draw = gnome_canvas_group_draw; item_class->render = gnome_canvas_group_render; item_class->point = gnome_canvas_group_point; item_class->bounds = gnome_canvas_group_bounds; } /* Object initialization function for GnomeCanvasGroup */ static void gnome_canvas_group_init (GnomeCanvasGroup *group) { #if 0 group->xpos = 0.0; group->ypos = 0.0; #endif } /* Translate handler for canvas groups */ static double * gnome_canvas_ensure_translate (GnomeCanvasItem *item) { if (item->xform == NULL) { GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_AFFINE_FULL); item->xform = g_new (double, 2); item->xform[0] = 0.0; item->xform[1] = 0.0; return item->xform; } else if (item->object.flags & GNOME_CANVAS_ITEM_AFFINE_FULL) { return item->xform + 4; } else { return item->xform; } } /* Set_property handler for canvas groups */ static void gnome_canvas_group_set_property (GObject *gobject, guint param_id, const GValue *value, GParamSpec *pspec) { GnomeCanvasItem *item; double *xlat; g_return_if_fail (GNOME_IS_CANVAS_GROUP (gobject)); item = GNOME_CANVAS_ITEM (gobject); switch (param_id) { case GROUP_PROP_X: xlat = gnome_canvas_ensure_translate (item); xlat[0] = g_value_get_double (value); break; case GROUP_PROP_Y: xlat = gnome_canvas_ensure_translate (item); xlat[1] = g_value_get_double (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec); break; } } /* Get_property handler for canvas groups */ static void gnome_canvas_group_get_property (GObject *gobject, guint param_id, GValue *value, GParamSpec *pspec) { GnomeCanvasItem *item; g_return_if_fail (GNOME_IS_CANVAS_GROUP (gobject)); item = GNOME_CANVAS_ITEM (gobject); switch (param_id) { case GROUP_PROP_X: if (item->xform == NULL) g_value_set_double (value, 0); else if (GTK_OBJECT (gobject)->flags & GNOME_CANVAS_ITEM_AFFINE_FULL) g_value_set_double (value, item->xform[4]); else g_value_set_double (value, item->xform[0]); break; case GROUP_PROP_Y: if (item->xform == NULL) g_value_set_double (value, 0); else if (GTK_OBJECT (gobject)->flags & GNOME_CANVAS_ITEM_AFFINE_FULL) g_value_set_double (value, item->xform[5]); else g_value_set_double (value, item->xform[1]); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec); break; } } /* Destroy handler for canvas groups */ static void gnome_canvas_group_destroy (GtkObject *object) { GnomeCanvasGroup *group; g_return_if_fail (GNOME_IS_CANVAS_GROUP (object)); group = GNOME_CANVAS_GROUP (object); while (group->item_list) { // child is unref'ed by the child's group_remove(). gtk_object_destroy (GTK_OBJECT (group->item_list->data)); } if (GTK_OBJECT_CLASS (group_parent_class)->destroy) (* GTK_OBJECT_CLASS (group_parent_class)->destroy) (object); } /* Update handler for canvas groups */ static void gnome_canvas_group_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags) { GnomeCanvasGroup *group; GList *list; GnomeCanvasItem *i; ArtDRect bbox, child_bbox; group = GNOME_CANVAS_GROUP (item); (* group_parent_class->update) (item, affine, clip_path, flags); bbox.x0 = 0; bbox.y0 = 0; bbox.x1 = 0; bbox.y1 = 0; for (list = group->item_list; list; list = list->next) { i = list->data; gnome_canvas_item_invoke_update (i, affine, clip_path, flags); child_bbox.x0 = i->x1; child_bbox.y0 = i->y1; child_bbox.x1 = i->x2; child_bbox.y1 = i->y2; art_drect_union (&bbox, &bbox, &child_bbox); } item->x1 = bbox.x0; item->y1 = bbox.y0; item->x2 = bbox.x1; item->y2 = bbox.y1; } /* Realize handler for canvas groups */ static void gnome_canvas_group_realize (GnomeCanvasItem *item) { GnomeCanvasGroup *group; GList *list; GnomeCanvasItem *i; group = GNOME_CANVAS_GROUP (item); for (list = group->item_list; list; list = list->next) { i = list->data; if (!(i->object.flags & GNOME_CANVAS_ITEM_REALIZED)) (* GNOME_CANVAS_ITEM_GET_CLASS (i)->realize) (i); } (* group_parent_class->realize) (item); } /* Unrealize handler for canvas groups */ static void gnome_canvas_group_unrealize (GnomeCanvasItem *item) { GnomeCanvasGroup *group; GList *list; GnomeCanvasItem *i; group = GNOME_CANVAS_GROUP (item); for (list = group->item_list; list; list = list->next) { i = list->data; if (i->object.flags & GNOME_CANVAS_ITEM_REALIZED) (* GNOME_CANVAS_ITEM_GET_CLASS (i)->unrealize) (i); } (* group_parent_class->unrealize) (item); } /* Map handler for canvas groups */ static void gnome_canvas_group_map (GnomeCanvasItem *item) { GnomeCanvasGroup *group; GList *list; GnomeCanvasItem *i; group = GNOME_CANVAS_GROUP (item); for (list = group->item_list; list; list = list->next) { i = list->data; if (!(i->object.flags & GNOME_CANVAS_ITEM_MAPPED)) (* GNOME_CANVAS_ITEM_GET_CLASS (i)->map) (i); } (* group_parent_class->map) (item); } /* Unmap handler for canvas groups */ static void gnome_canvas_group_unmap (GnomeCanvasItem *item) { GnomeCanvasGroup *group; GList *list; GnomeCanvasItem *i; group = GNOME_CANVAS_GROUP (item); for (list = group->item_list; list; list = list->next) { i = list->data; if (i->object.flags & GNOME_CANVAS_ITEM_MAPPED) (* GNOME_CANVAS_ITEM_GET_CLASS (i)->unmap) (i); } (* group_parent_class->unmap) (item); } /* Draw handler for canvas groups */ static void gnome_canvas_group_draw (GnomeCanvasItem *item, GdkDrawable *drawable, int x, int y, int width, int height) { GnomeCanvasGroup *group; GList *list; GnomeCanvasItem *child = NULL; group = GNOME_CANVAS_GROUP (item); for (list = group->item_list; list; list = list->next) { child = list->data; if (((child->object.flags & GNOME_CANVAS_ITEM_VISIBLE) && ((child->x1 < (x + width)) && (child->y1 < (y + height)) && (child->x2 > x) && (child->y2 > y))) || ((GTK_OBJECT_FLAGS (child) & GNOME_CANVAS_ITEM_ALWAYS_REDRAW) && (child->x1 < child->canvas->redraw_x2) && (child->y1 < child->canvas->redraw_y2) && (child->x2 > child->canvas->redraw_x1) && (child->y2 > child->canvas->redraw_y2))) if (GNOME_CANVAS_ITEM_GET_CLASS (child)->draw) (* GNOME_CANVAS_ITEM_GET_CLASS (child)->draw) ( child, drawable, x, y, width, height); } } /* Point handler for canvas groups */ static double gnome_canvas_group_point (GnomeCanvasItem *item, double x, double y, int cx, int cy, GnomeCanvasItem **actual_item) { GnomeCanvasGroup *group; GList *list; GnomeCanvasItem *child, *point_item; int x1, y1, x2, y2; double gx, gy; double dist, best; int has_point; group = GNOME_CANVAS_GROUP (item); x1 = cx - item->canvas->close_enough; y1 = cy - item->canvas->close_enough; x2 = cx + item->canvas->close_enough; y2 = cy + item->canvas->close_enough; best = 0.0; *actual_item = NULL; gx = x; gy = y; dist = 0.0; /* keep gcc happy */ for (list = group->item_list; list; list = list->next) { child = list->data; if ((child->x1 > x2) || (child->y1 > y2) || (child->x2 < x1) || (child->y2 < y1)) continue; point_item = NULL; /* cater for incomplete item implementations */ if ((child->object.flags & GNOME_CANVAS_ITEM_VISIBLE) && GNOME_CANVAS_ITEM_GET_CLASS (child)->point) { dist = gnome_canvas_item_invoke_point (child, gx, gy, cx, cy, &point_item); has_point = TRUE; } else has_point = FALSE; if (has_point && point_item && ((int) (dist * item->canvas->pixels_per_unit + 0.5) <= item->canvas->close_enough)) { best = dist; *actual_item = point_item; } } return best; } /* Bounds handler for canvas groups */ static void gnome_canvas_group_bounds (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2) { GnomeCanvasGroup *group; GnomeCanvasItem *child; GList *list; double tx1, ty1, tx2, ty2; double minx, miny, maxx, maxy; int set; group = GNOME_CANVAS_GROUP (item); /* Get the bounds of the first visible item */ child = NULL; /* Unnecessary but eliminates a warning. */ set = FALSE; for (list = group->item_list; list; list = list->next) { child = list->data; if (child->object.flags & GNOME_CANVAS_ITEM_VISIBLE) { set = TRUE; gnome_canvas_item_get_bounds (child, &minx, &miny, &maxx, &maxy); break; } } /* If there were no visible items, return an empty bounding box */ if (!set) { *x1 = *y1 = *x2 = *y2 = 0.0; return; } /* Now we can grow the bounds using the rest of the items */ list = list->next; for (; list; list = list->next) { child = list->data; if (!(child->object.flags & GNOME_CANVAS_ITEM_VISIBLE)) continue; gnome_canvas_item_get_bounds (child, &tx1, &ty1, &tx2, &ty2); if (tx1 < minx) minx = tx1; if (ty1 < miny) miny = ty1; if (tx2 > maxx) maxx = tx2; if (ty2 > maxy) maxy = ty2; } *x1 = minx; *y1 = miny; *x2 = maxx; *y2 = maxy; } /* Render handler for canvas groups */ static void gnome_canvas_group_render (GnomeCanvasItem *item, GnomeCanvasBuf *buf) { GnomeCanvasGroup *group; GnomeCanvasItem *child; GList *list; group = GNOME_CANVAS_GROUP (item); for (list = group->item_list; list; list = list->next) { child = list->data; if (((child->object.flags & GNOME_CANVAS_ITEM_VISIBLE) && ((child->x1 < buf->rect.x1) && (child->y1 < buf->rect.y1) && (child->x2 > buf->rect.x0) && (child->y2 > buf->rect.y0))) || ((GTK_OBJECT_FLAGS (child) & GNOME_CANVAS_ITEM_ALWAYS_REDRAW) && (child->x1 < child->canvas->redraw_x2) && (child->y1 < child->canvas->redraw_y2) && (child->x2 > child->canvas->redraw_x1) && (child->y2 > child->canvas->redraw_y2))) if (GNOME_CANVAS_ITEM_GET_CLASS (child)->render) (* GNOME_CANVAS_ITEM_GET_CLASS (child)->render) ( child, buf); } } /* Adds an item to a group */ static void group_add (GnomeCanvasGroup *group, GnomeCanvasItem *item) { g_object_ref (G_OBJECT (item)); gtk_object_sink (GTK_OBJECT (item)); if (!group->item_list) { group->item_list = g_list_append (group->item_list, item); group->item_list_end = group->item_list; } else group->item_list_end = g_list_append (group->item_list_end, item)->next; if (group->item.object.flags & GNOME_CANVAS_ITEM_REALIZED) (* GNOME_CANVAS_ITEM_GET_CLASS (item)->realize) (item); if (group->item.object.flags & GNOME_CANVAS_ITEM_MAPPED) (* GNOME_CANVAS_ITEM_GET_CLASS (item)->map) (item); g_object_notify (G_OBJECT (item), "parent"); } /* Removes an item from a group */ static void group_remove (GnomeCanvasGroup *group, GnomeCanvasItem *item) { GList *children; g_return_if_fail (GNOME_IS_CANVAS_GROUP (group)); g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); for (children = group->item_list; children; children = children->next) if (children->data == item) { if (item->object.flags & GNOME_CANVAS_ITEM_MAPPED) (* GNOME_CANVAS_ITEM_GET_CLASS (item)->unmap) (item); if (item->object.flags & GNOME_CANVAS_ITEM_REALIZED) (* GNOME_CANVAS_ITEM_GET_CLASS (item)->unrealize) (item); /* Unparent the child */ item->parent = NULL; g_object_unref (G_OBJECT (item)); /* Remove it from the list */ if (children == group->item_list_end) group->item_list_end = children->prev; group->item_list = g_list_remove_link (group->item_list, children); g_list_free (children); break; } } /*** GnomeCanvas ***/ enum { DRAW_BACKGROUND, RENDER_BACKGROUND, LAST_SIGNAL }; static void gnome_canvas_class_init (GnomeCanvasClass *class); static void gnome_canvas_init (GnomeCanvas *canvas); static void gnome_canvas_destroy (GtkObject *object); static void gnome_canvas_map (GtkWidget *widget); static void gnome_canvas_unmap (GtkWidget *widget); static void gnome_canvas_realize (GtkWidget *widget); static void gnome_canvas_unrealize (GtkWidget *widget); static void gnome_canvas_size_allocate (GtkWidget *widget, GtkAllocation *allocation); static gint gnome_canvas_button (GtkWidget *widget, GdkEventButton *event); static gint gnome_canvas_motion (GtkWidget *widget, GdkEventMotion *event); static gint gnome_canvas_expose (GtkWidget *widget, GdkEventExpose *event); static gboolean gnome_canvas_key (GtkWidget *widget, GdkEventKey *event); static gint gnome_canvas_crossing (GtkWidget *widget, GdkEventCrossing *event); static gint gnome_canvas_focus_in (GtkWidget *widget, GdkEventFocus *event); static gint gnome_canvas_focus_out (GtkWidget *widget, GdkEventFocus *event); static void gnome_canvas_request_update_real (GnomeCanvas *canvas); static void gnome_canvas_draw_background (GnomeCanvas *canvas, GdkDrawable *drawable, int x, int y, int width, int height); static GtkLayoutClass *canvas_parent_class; static guint canvas_signals[LAST_SIGNAL]; enum { PROP_AA = 1 }; /** * gnome_canvas_get_type: * * Registers the &GnomeCanvas class if necessary, and returns the type ID * associated to it. * * Return value: The type ID of the &GnomeCanvas class. **/ GType gnome_canvas_get_type (void) { static GType canvas_type; if (!canvas_type) { static const GTypeInfo object_info = { sizeof (GnomeCanvasClass), (GBaseInitFunc) NULL, (GBaseFinalizeFunc) NULL, (GClassInitFunc) gnome_canvas_class_init, (GClassFinalizeFunc) NULL, NULL, /* class_data */ sizeof (GnomeCanvas), 0, /* n_preallocs */ (GInstanceInitFunc) gnome_canvas_init, NULL /* value_table */ }; canvas_type = g_type_register_static (GTK_TYPE_LAYOUT, "GnomeCanvas", &object_info, 0); } return canvas_type; } static void gnome_canvas_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { switch (prop_id) { case PROP_AA: g_value_set_boolean (value, GNOME_CANVAS (object)->aa); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gnome_canvas_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { switch (prop_id) { case PROP_AA: GNOME_CANVAS (object)->aa = g_value_get_boolean (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } /* Class initialization function for GnomeCanvasClass */ static void gnome_canvas_class_init (GnomeCanvasClass *klass) { GObjectClass *gobject_class; GtkObjectClass *object_class; GtkWidgetClass *widget_class; gobject_class = (GObjectClass *)klass; object_class = (GtkObjectClass *) klass; widget_class = (GtkWidgetClass *) klass; canvas_parent_class = g_type_class_peek_parent (klass); gobject_class->set_property = gnome_canvas_set_property; gobject_class->get_property = gnome_canvas_get_property; object_class->destroy = gnome_canvas_destroy; widget_class->map = gnome_canvas_map; widget_class->unmap = gnome_canvas_unmap; widget_class->realize = gnome_canvas_realize; widget_class->unrealize = gnome_canvas_unrealize; widget_class->size_allocate = gnome_canvas_size_allocate; widget_class->button_press_event = gnome_canvas_button; widget_class->button_release_event = gnome_canvas_button; widget_class->motion_notify_event = gnome_canvas_motion; widget_class->expose_event = gnome_canvas_expose; widget_class->key_press_event = gnome_canvas_key; widget_class->key_release_event = gnome_canvas_key; widget_class->enter_notify_event = gnome_canvas_crossing; widget_class->leave_notify_event = gnome_canvas_crossing; widget_class->focus_in_event = gnome_canvas_focus_in; widget_class->focus_out_event = gnome_canvas_focus_out; klass->draw_background = gnome_canvas_draw_background; klass->render_background = NULL; klass->request_update = gnome_canvas_request_update_real; g_object_class_install_property (G_OBJECT_CLASS (object_class), PROP_AA, g_param_spec_boolean ("aa", "Antialiased", "The antialiasing mode of the canvas.", FALSE, G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY)); canvas_signals[DRAW_BACKGROUND] = g_signal_new ("draw_background", G_TYPE_FROM_CLASS (object_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GnomeCanvasClass, draw_background), NULL, NULL, gnome_canvas_marshal_VOID__OBJECT_INT_INT_INT_INT, G_TYPE_NONE, 5, GDK_TYPE_DRAWABLE, G_TYPE_INT, G_TYPE_INT, G_TYPE_INT, G_TYPE_INT); canvas_signals[RENDER_BACKGROUND] = g_signal_new ("render_background", G_TYPE_FROM_CLASS (object_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GnomeCanvasClass, render_background), NULL, NULL, g_cclosure_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER); } /* Callback used when the root item of a canvas is destroyed. The user should * never ever do this, so we panic if this happens. */ static void panic_root_destroyed (GtkObject *object, gpointer data) { g_error ("Eeeek, root item %p of canvas %p was destroyed!", object, data); } /* Object initialization function for GnomeCanvas */ static void gnome_canvas_init (GnomeCanvas *canvas) { GTK_WIDGET_SET_FLAGS (canvas, GTK_CAN_FOCUS); canvas->need_update = FALSE; canvas->need_redraw = FALSE; canvas->redraw_area = NULL; canvas->idle_id = 0; canvas->scroll_x1 = 0.0; canvas->scroll_y1 = 0.0; canvas->scroll_x2 = canvas->layout.width; canvas->scroll_y2 = canvas->layout.height; canvas->pixels_per_unit = 1.0; canvas->pick_event.type = GDK_LEAVE_NOTIFY; canvas->pick_event.crossing.x = 0; canvas->pick_event.crossing.y = 0; canvas->dither = GDK_RGB_DITHER_MAX; /* This may not be what people want, but it is set to be turned on by * default to have the same initial behavior as the canvas in GNOME 1.4. */ canvas->center_scroll_region = TRUE; gtk_layout_set_hadjustment (GTK_LAYOUT (canvas), NULL); gtk_layout_set_vadjustment (GTK_LAYOUT (canvas), NULL); /* Disable the gtk+ double buffering since the canvas uses it's own. */ gtk_widget_set_double_buffered (GTK_WIDGET (canvas), FALSE); /* Create the root item as a special case */ canvas->root = GNOME_CANVAS_ITEM (g_object_new (gnome_canvas_group_get_type (), NULL)); canvas->root->canvas = canvas; g_object_ref (canvas->root); gtk_object_sink (GTK_OBJECT (canvas->root)); canvas->root_destroy_id = g_signal_connect (canvas->root, "destroy", G_CALLBACK (panic_root_destroyed), canvas); canvas->need_repick = TRUE; } /* Convenience function to remove the idle handler of a canvas */ static void remove_idle (GnomeCanvas *canvas) { if (canvas->idle_id == 0) return; gtk_idle_remove (canvas->idle_id); canvas->idle_id = 0; } /* Removes the transient state of the canvas (idle handler, grabs). */ static void shutdown_transients (GnomeCanvas *canvas) { /* We turn off the need_redraw flag, since if the canvas is mapped again * it will request a redraw anyways. We do not turn off the need_update * flag, though, because updates are not queued when the canvas remaps * itself. */ if (canvas->need_redraw) { canvas->need_redraw = FALSE; art_uta_free (canvas->redraw_area); canvas->redraw_area = NULL; canvas->redraw_x1 = 0; canvas->redraw_y1 = 0; canvas->redraw_x2 = 0; canvas->redraw_y2 = 0; } if (canvas->grabbed_item) { canvas->grabbed_item = NULL; gdk_pointer_ungrab (GDK_CURRENT_TIME); } remove_idle (canvas); } /* Destroy handler for GnomeCanvas */ static void gnome_canvas_destroy (GtkObject *object) { GnomeCanvas *canvas; g_return_if_fail (GNOME_IS_CANVAS (object)); /* remember, destroy can be run multiple times! */ canvas = GNOME_CANVAS (object); if (canvas->root_destroy_id) { g_signal_handler_disconnect (canvas->root, canvas->root_destroy_id); canvas->root_destroy_id = 0; } if (canvas->root) { gtk_object_destroy (GTK_OBJECT (canvas->root)); g_object_unref (G_OBJECT (canvas->root)); canvas->root = NULL; } shutdown_transients (canvas); if (GTK_OBJECT_CLASS (canvas_parent_class)->destroy) (* GTK_OBJECT_CLASS (canvas_parent_class)->destroy) (object); } /** * gnome_canvas_new: * * Creates a new empty canvas in non-antialiased mode. * * Return value: A newly-created canvas. **/ GtkWidget * gnome_canvas_new (void) { return GTK_WIDGET (g_object_new (gnome_canvas_get_type (), NULL)); } /** * gnome_canvas_new_aa: * * Creates a new empty canvas in antialiased mode. * * Return value: A newly-created antialiased canvas. **/ GtkWidget * gnome_canvas_new_aa (void) { return GTK_WIDGET (g_object_new (GNOME_TYPE_CANVAS, "aa", TRUE, NULL)); } /* Map handler for the canvas */ static void gnome_canvas_map (GtkWidget *widget) { GnomeCanvas *canvas; g_return_if_fail (GNOME_IS_CANVAS (widget)); /* Normal widget mapping stuff */ if (GTK_WIDGET_CLASS (canvas_parent_class)->map) (* GTK_WIDGET_CLASS (canvas_parent_class)->map) (widget); canvas = GNOME_CANVAS (widget); if (canvas->need_update) add_idle (canvas); /* Map items */ if (GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->map) (* GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->map) (canvas->root); } /* Unmap handler for the canvas */ static void gnome_canvas_unmap (GtkWidget *widget) { GnomeCanvas *canvas; g_return_if_fail (GNOME_IS_CANVAS (widget)); canvas = GNOME_CANVAS (widget); shutdown_transients (canvas); /* Unmap items */ if (GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->unmap) (* GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->unmap) (canvas->root); /* Normal widget unmapping stuff */ if (GTK_WIDGET_CLASS (canvas_parent_class)->unmap) (* GTK_WIDGET_CLASS (canvas_parent_class)->unmap) (widget); } /* Realize handler for the canvas */ static void gnome_canvas_realize (GtkWidget *widget) { GnomeCanvas *canvas; g_return_if_fail (GNOME_IS_CANVAS (widget)); /* Normal widget realization stuff */ if (GTK_WIDGET_CLASS (canvas_parent_class)->realize) (* GTK_WIDGET_CLASS (canvas_parent_class)->realize) (widget); canvas = GNOME_CANVAS (widget); gdk_window_set_events (canvas->layout.bin_window, (gdk_window_get_events (canvas->layout.bin_window) | GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK | GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK | GDK_FOCUS_CHANGE_MASK)); /* Create our own temporary pixmap gc and realize all the items */ canvas->pixmap_gc = gdk_gc_new (canvas->layout.bin_window); (* GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->realize) (canvas->root); } /* Unrealize handler for the canvas */ static void gnome_canvas_unrealize (GtkWidget *widget) { GnomeCanvas *canvas; g_return_if_fail (GNOME_IS_CANVAS (widget)); canvas = GNOME_CANVAS (widget); shutdown_transients (canvas); /* Unrealize items and parent widget */ (* GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->unrealize) (canvas->root); gdk_gc_destroy (canvas->pixmap_gc); canvas->pixmap_gc = NULL; if (GTK_WIDGET_CLASS (canvas_parent_class)->unrealize) (* GTK_WIDGET_CLASS (canvas_parent_class)->unrealize) (widget); } /* Handles scrolling of the canvas. Adjusts the scrolling and zooming offset to * keep as much as possible of the canvas scrolling region in view. */ static void scroll_to (GnomeCanvas *canvas, int cx, int cy) { int scroll_width, scroll_height; int right_limit, bottom_limit; int old_zoom_xofs, old_zoom_yofs; int changed_x = FALSE, changed_y = FALSE; int canvas_width, canvas_height; canvas_width = GTK_WIDGET (canvas)->allocation.width; canvas_height = GTK_WIDGET (canvas)->allocation.height; scroll_width = floor ((canvas->scroll_x2 - canvas->scroll_x1) * canvas->pixels_per_unit + 0.5); scroll_height = floor ((canvas->scroll_y2 - canvas->scroll_y1) * canvas->pixels_per_unit + 0.5); right_limit = scroll_width - canvas_width; bottom_limit = scroll_height - canvas_height; old_zoom_xofs = canvas->zoom_xofs; old_zoom_yofs = canvas->zoom_yofs; if (right_limit < 0) { cx = 0; if (canvas->center_scroll_region) { canvas->zoom_xofs = (canvas_width - scroll_width) / 2; scroll_width = canvas_width; } else canvas->zoom_xofs = 0; } else if (cx < 0) { cx = 0; canvas->zoom_xofs = 0; } else if (cx > right_limit) { cx = right_limit; canvas->zoom_xofs = 0; } else canvas->zoom_xofs = 0; if (bottom_limit < 0) { cy = 0; if (canvas->center_scroll_region) { canvas->zoom_yofs = (canvas_height - scroll_height) / 2; scroll_height = canvas_height; } else canvas->zoom_yofs = 0; } else if (cy < 0) { cy = 0; canvas->zoom_yofs = 0; } else if (cy > bottom_limit) { cy = bottom_limit; canvas->zoom_yofs = 0; } else canvas->zoom_yofs = 0; if ((canvas->zoom_xofs != old_zoom_xofs) || (canvas->zoom_yofs != old_zoom_yofs)) { /* This can only occur, if either canvas size or widget size changes */ /* So I think we can request full redraw here */ /* The reason is, that coverage UTA will be invalidated by offset change */ /* fixme: Strictly this is not correct - we have to remove our own idle (Lauris) */ /* More stuff - we have to mark root as needing fresh affine (Lauris) */ if (!(canvas->root->object.flags & GNOME_CANVAS_ITEM_NEED_AFFINE)) { canvas->root->object.flags |= GNOME_CANVAS_ITEM_NEED_AFFINE; gnome_canvas_request_update (canvas); } gtk_widget_queue_draw (GTK_WIDGET (canvas)); } if (canvas->layout.hadjustment && ((int) canvas->layout.hadjustment->value) != cx) { canvas->layout.hadjustment->value = cx; changed_x = TRUE; } if (canvas->layout.vadjustment && ((int) canvas->layout.vadjustment->value) != cy) { canvas->layout.vadjustment->value = cy; changed_y = TRUE; } if ((scroll_width != (int) canvas->layout.width) || (scroll_height != (int) canvas->layout.height)) gtk_layout_set_size (GTK_LAYOUT (canvas), scroll_width, scroll_height); /* Signal GtkLayout that it should do a redraw. */ if (changed_x) g_signal_emit_by_name (canvas->layout.hadjustment, "value_changed"); if (changed_y) g_signal_emit_by_name (canvas->layout.vadjustment, "value_changed"); } /* Size allocation handler for the canvas */ static void gnome_canvas_size_allocate (GtkWidget *widget, GtkAllocation *allocation) { GnomeCanvas *canvas; g_return_if_fail (GNOME_IS_CANVAS (widget)); g_return_if_fail (allocation != NULL); if (GTK_WIDGET_CLASS (canvas_parent_class)->size_allocate) (* GTK_WIDGET_CLASS (canvas_parent_class)->size_allocate) (widget, allocation); canvas = GNOME_CANVAS (widget); /* Recenter the view, if appropriate */ canvas->layout.hadjustment->page_size = allocation->width; canvas->layout.hadjustment->page_increment = allocation->width / 2; canvas->layout.vadjustment->page_size = allocation->height; canvas->layout.vadjustment->page_increment = allocation->height / 2; scroll_to (canvas, canvas->layout.hadjustment->value, canvas->layout.vadjustment->value); g_signal_emit_by_name (canvas->layout.hadjustment, "changed"); g_signal_emit_by_name (canvas->layout.vadjustment, "changed"); } /* Emits an event for an item in the canvas, be it the current item, grabbed * item, or focused item, as appropriate. */ static int emit_event (GnomeCanvas *canvas, GdkEvent *event) { GdkEvent *ev; gint finished; GnomeCanvasItem *item; GnomeCanvasItem *parent; guint mask; /* Perform checks for grabbed items */ if (canvas->grabbed_item && !is_descendant (canvas->current_item, canvas->grabbed_item)) { /* I think this warning is annoying and I don't know what it's for * so I'll disable it for now. */ /* g_warning ("emit_event() returning FALSE!\n");*/ return FALSE; } if (canvas->grabbed_item) { switch (event->type) { case GDK_ENTER_NOTIFY: mask = GDK_ENTER_NOTIFY_MASK; break; case GDK_LEAVE_NOTIFY: mask = GDK_LEAVE_NOTIFY_MASK; break; case GDK_MOTION_NOTIFY: mask = GDK_POINTER_MOTION_MASK; break; case GDK_BUTTON_PRESS: case GDK_2BUTTON_PRESS: case GDK_3BUTTON_PRESS: mask = GDK_BUTTON_PRESS_MASK; break; case GDK_BUTTON_RELEASE: mask = GDK_BUTTON_RELEASE_MASK; break; case GDK_KEY_PRESS: mask = GDK_KEY_PRESS_MASK; break; case GDK_KEY_RELEASE: mask = GDK_KEY_RELEASE_MASK; break; default: mask = 0; break; } if (!(mask & canvas->grabbed_event_mask)) return FALSE; } /* Convert to world coordinates -- we have two cases because of diferent * offsets of the fields in the event structures. */ ev = gdk_event_copy (event); switch (ev->type) { case GDK_ENTER_NOTIFY: case GDK_LEAVE_NOTIFY: gnome_canvas_window_to_world (canvas, ev->crossing.x, ev->crossing.y, &ev->crossing.x, &ev->crossing.y); break; case GDK_MOTION_NOTIFY: case GDK_BUTTON_PRESS: case GDK_2BUTTON_PRESS: case GDK_3BUTTON_PRESS: case GDK_BUTTON_RELEASE: gnome_canvas_window_to_world (canvas, ev->motion.x, ev->motion.y, &ev->motion.x, &ev->motion.y); break; default: break; } /* Choose where we send the event */ item = canvas->current_item; if (canvas->focused_item && ((event->type == GDK_KEY_PRESS) || (event->type == GDK_KEY_RELEASE) || (event->type == GDK_FOCUS_CHANGE))) item = canvas->focused_item; /* The event is propagated up the hierarchy (for if someone connected to * a group instead of a leaf event), and emission is stopped if a * handler returns TRUE, just like for GtkWidget events. */ finished = FALSE; while (item && !finished) { g_object_ref (G_OBJECT (item)); g_signal_emit (item, item_signals[ITEM_EVENT], 0, ev, &finished); parent = item->parent; g_object_unref (G_OBJECT (item)); item = parent; } gdk_event_free (ev); return finished; } /* Re-picks the current item in the canvas, based on the event's coordinates. * Also emits enter/leave events for items as appropriate. */ static int pick_current_item (GnomeCanvas *canvas, GdkEvent *event) { int button_down; double x, y; int cx, cy; int retval; retval = FALSE; /* If a button is down, we'll perform enter and leave events on the * current item, but not enter on any other item. This is more or less * like X pointer grabbing for canvas items. */ button_down = canvas->state & (GDK_BUTTON1_MASK | GDK_BUTTON2_MASK | GDK_BUTTON3_MASK | GDK_BUTTON4_MASK | GDK_BUTTON5_MASK); if (!button_down) canvas->left_grabbed_item = FALSE; /* Save the event in the canvas. This is used to synthesize enter and * leave events in case the current item changes. It is also used to * re-pick the current item if the current one gets deleted. Also, * synthesize an enter event. */ if (event != &canvas->pick_event) { if ((event->type == GDK_MOTION_NOTIFY) || (event->type == GDK_BUTTON_RELEASE)) { /* these fields have the same offsets in both types of events */ canvas->pick_event.crossing.type = GDK_ENTER_NOTIFY; canvas->pick_event.crossing.window = event->motion.window; canvas->pick_event.crossing.send_event = event->motion.send_event; canvas->pick_event.crossing.subwindow = NULL; canvas->pick_event.crossing.x = event->motion.x; canvas->pick_event.crossing.y = event->motion.y; canvas->pick_event.crossing.mode = GDK_CROSSING_NORMAL; canvas->pick_event.crossing.detail = GDK_NOTIFY_NONLINEAR; canvas->pick_event.crossing.focus = FALSE; canvas->pick_event.crossing.state = event->motion.state; /* these fields don't have the same offsets in both types of events */ if (event->type == GDK_MOTION_NOTIFY) { canvas->pick_event.crossing.x_root = event->motion.x_root; canvas->pick_event.crossing.y_root = event->motion.y_root; } else { canvas->pick_event.crossing.x_root = event->button.x_root; canvas->pick_event.crossing.y_root = event->button.y_root; } } else canvas->pick_event = *event; } /* Don't do anything else if this is a recursive call */ if (canvas->in_repick) return retval; /* LeaveNotify means that there is no current item, so we don't look for one */ if (canvas->pick_event.type != GDK_LEAVE_NOTIFY) { /* these fields don't have the same offsets in both types of events */ if (canvas->pick_event.type == GDK_ENTER_NOTIFY) { x = canvas->pick_event.crossing.x - canvas->zoom_xofs; y = canvas->pick_event.crossing.y - canvas->zoom_yofs; } else { x = canvas->pick_event.motion.x - canvas->zoom_xofs; y = canvas->pick_event.motion.y - canvas->zoom_yofs; } /* canvas pixel coords */ cx = (int) (x + 0.5); cy = (int) (y + 0.5); /* world coords */ x = canvas->scroll_x1 + x / canvas->pixels_per_unit; y = canvas->scroll_y1 + y / canvas->pixels_per_unit; /* find the closest item */ if (canvas->root->object.flags & GNOME_CANVAS_ITEM_VISIBLE) gnome_canvas_item_invoke_point (canvas->root, x, y, cx, cy, &canvas->new_current_item); else canvas->new_current_item = NULL; } else canvas->new_current_item = NULL; if ((canvas->new_current_item == canvas->current_item) && !canvas->left_grabbed_item) return retval; /* current item did not change */ /* Synthesize events for old and new current items */ if ((canvas->new_current_item != canvas->current_item) && (canvas->current_item != NULL) && !canvas->left_grabbed_item) { GdkEvent new_event; new_event = canvas->pick_event; new_event.type = GDK_LEAVE_NOTIFY; new_event.crossing.detail = GDK_NOTIFY_ANCESTOR; new_event.crossing.subwindow = NULL; canvas->in_repick = TRUE; retval = emit_event (canvas, &new_event); canvas->in_repick = FALSE; } /* new_current_item may have been set to NULL during the call to emit_event() above */ if ((canvas->new_current_item != canvas->current_item) && button_down) { canvas->left_grabbed_item = TRUE; return retval; } /* Handle the rest of cases */ canvas->left_grabbed_item = FALSE; canvas->current_item = canvas->new_current_item; if (canvas->current_item != NULL) { GdkEvent new_event; new_event = canvas->pick_event; new_event.type = GDK_ENTER_NOTIFY; new_event.crossing.detail = GDK_NOTIFY_ANCESTOR; new_event.crossing.subwindow = NULL; retval = emit_event (canvas, &new_event); } return retval; } /* Button event handler for the canvas */ static gint gnome_canvas_button (GtkWidget *widget, GdkEventButton *event) { GnomeCanvas *canvas; int mask; int retval; g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE); g_return_val_if_fail (event != NULL, FALSE); retval = FALSE; canvas = GNOME_CANVAS (widget); /* * dispatch normally regardless of the event's window if an item has * has a pointer grab in effect */ if (!canvas->grabbed_item && event->window != canvas->layout.bin_window) return retval; switch (event->button) { case 1: mask = GDK_BUTTON1_MASK; break; case 2: mask = GDK_BUTTON2_MASK; break; case 3: mask = GDK_BUTTON3_MASK; break; case 4: mask = GDK_BUTTON4_MASK; break; case 5: mask = GDK_BUTTON5_MASK; break; default: mask = 0; } switch (event->type) { case GDK_BUTTON_PRESS: case GDK_2BUTTON_PRESS: case GDK_3BUTTON_PRESS: /* Pick the current item as if the button were not pressed, and * then process the event. */ canvas->state = event->state; pick_current_item (canvas, (GdkEvent *) event); canvas->state ^= mask; retval = emit_event (canvas, (GdkEvent *) event); break; case GDK_BUTTON_RELEASE: /* Process the event as if the button were pressed, then repick * after the button has been released */ canvas->state = event->state; retval = emit_event (canvas, (GdkEvent *) event); event->state ^= mask; canvas->state = event->state; pick_current_item (canvas, (GdkEvent *) event); event->state ^= mask; break; default: g_assert_not_reached (); } return retval; } /* Motion event handler for the canvas */ static gint gnome_canvas_motion (GtkWidget *widget, GdkEventMotion *event) { GnomeCanvas *canvas; g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE); g_return_val_if_fail (event != NULL, FALSE); canvas = GNOME_CANVAS (widget); if (event->window != canvas->layout.bin_window) return FALSE; canvas->state = event->state; pick_current_item (canvas, (GdkEvent *) event); return emit_event (canvas, (GdkEvent *) event); } /* Key event handler for the canvas */ static gboolean gnome_canvas_key (GtkWidget *widget, GdkEventKey *event) { GnomeCanvas *canvas; g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE); g_return_val_if_fail (event != NULL, FALSE); canvas = GNOME_CANVAS (widget); if (!emit_event (canvas, (GdkEvent *) event)) { GtkWidgetClass *widget_class; widget_class = GTK_WIDGET_CLASS (canvas_parent_class); if (event->type == GDK_KEY_PRESS) { if (widget_class->key_press_event) return (* widget_class->key_press_event) (widget, event); } else if (event->type == GDK_KEY_RELEASE) { if (widget_class->key_release_event) return (* widget_class->key_release_event) (widget, event); } else g_assert_not_reached (); return FALSE; } else return TRUE; } /* Crossing event handler for the canvas */ static gint gnome_canvas_crossing (GtkWidget *widget, GdkEventCrossing *event) { GnomeCanvas *canvas; g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE); g_return_val_if_fail (event != NULL, FALSE); canvas = GNOME_CANVAS (widget); if (event->window != canvas->layout.bin_window) return FALSE; canvas->state = event->state; return pick_current_item (canvas, (GdkEvent *) event); } /* Focus in handler for the canvas */ static gint gnome_canvas_focus_in (GtkWidget *widget, GdkEventFocus *event) { GnomeCanvas *canvas; GTK_WIDGET_SET_FLAGS (widget, GTK_HAS_FOCUS); canvas = GNOME_CANVAS (widget); if (canvas->focused_item) return emit_event (canvas, (GdkEvent *) event); else return FALSE; } /* Focus out handler for the canvas */ static gint gnome_canvas_focus_out (GtkWidget *widget, GdkEventFocus *event) { GnomeCanvas *canvas; GTK_WIDGET_UNSET_FLAGS (widget, GTK_HAS_FOCUS); canvas = GNOME_CANVAS (widget); if (canvas->focused_item) return emit_event (canvas, (GdkEvent *) event); else return FALSE; } #define IMAGE_WIDTH 512 #define IMAGE_HEIGHT 512 #define IMAGE_WIDTH_AA 256 #define IMAGE_HEIGHT_AA 64 static void gnome_canvas_paint_rect (GnomeCanvas *canvas, gint x0, gint y0, gint x1, gint y1) { GtkWidget *widget; gint draw_x1, draw_y1; gint draw_x2, draw_y2; gint xblock, yblock; guchar *px; GdkPixmap *pixmap; g_return_if_fail (!canvas->need_update); widget = GTK_WIDGET (canvas); draw_x1 = MAX (x0, canvas->layout.hadjustment->value - canvas->zoom_xofs); draw_y1 = MAX (y0, canvas->layout.vadjustment->value - canvas->zoom_yofs); draw_x2 = MIN (draw_x1 + GTK_WIDGET (canvas)->allocation.width, x1); draw_y2 = MIN (draw_y1 + GTK_WIDGET (canvas)->allocation.height, y1); /* As we can come from expose, we have to tile here */ xblock = (canvas->aa) ? IMAGE_WIDTH_AA : IMAGE_WIDTH; yblock = (canvas->aa) ? IMAGE_HEIGHT_AA : IMAGE_HEIGHT; px = NULL; pixmap = NULL; for (y0 = draw_y1; y0 < draw_y2; y0 += yblock) { y1 = MIN (y0 + yblock, draw_y2); for (x0 = draw_x1; x0 < draw_x2; x0 += xblock) { x1 = MIN (x0 + xblock, draw_x2); canvas->redraw_x1 = x0; canvas->redraw_y1 = y0; canvas->redraw_x2 = x1; canvas->redraw_y2 = y1; canvas->draw_xofs = x0; canvas->draw_yofs = y0; if (canvas->aa) { GnomeCanvasBuf buf; GdkColor *color; if (!px) px = g_new (guchar, IMAGE_WIDTH_AA * IMAGE_HEIGHT_AA * 3); buf.buf = px; buf.buf_rowstride = IMAGE_WIDTH_AA * 3; buf.rect.x0 = x0; buf.rect.y0 = y0; buf.rect.x1 = x1; buf.rect.y1 = y1; color = &widget->style->bg[GTK_STATE_NORMAL]; buf.bg_color = (((color->red & 0xff00) << 8) | (color->green & 0xff00) | (color->blue >> 8)); buf.is_bg = 1; buf.is_buf = 0; g_signal_emit (G_OBJECT (canvas), canvas_signals[RENDER_BACKGROUND], 0, &buf); if (canvas->root->object.flags & GNOME_CANVAS_ITEM_VISIBLE) (* GNOME_CANVAS_ITEM_GET_CLASS (canvas->root)->render) (canvas->root, &buf); if (buf.is_bg) { gdk_rgb_gc_set_foreground (canvas->pixmap_gc, buf.bg_color); gdk_draw_rectangle (canvas->layout.bin_window, canvas->pixmap_gc, TRUE, (x0 + canvas->zoom_xofs), (y0 + canvas->zoom_yofs), x1 - x0, y1 - y0); } else { gdk_draw_rgb_image_dithalign (canvas->layout.bin_window, canvas->pixmap_gc, (x0 + canvas->zoom_xofs), (y0 + canvas->zoom_yofs), x1 - x0, y1 - y0, canvas->dither, buf.buf, IMAGE_WIDTH_AA * 3, x0, y0); } } else { if (!pixmap) pixmap = gdk_pixmap_new (canvas->layout.bin_window, IMAGE_WIDTH, IMAGE_HEIGHT, gtk_widget_get_visual (widget)->depth); g_signal_emit (G_OBJECT (canvas), canvas_signals[DRAW_BACKGROUND], 0, pixmap, x0, y0, x1 - x0, y1 - y0); if (canvas->root->object.flags & GNOME_CANVAS_ITEM_VISIBLE) (* GNOME_CANVAS_ITEM_GET_CLASS ( canvas->root)->draw) ( canvas->root, pixmap, x0, y0, x1 - x0, y1 - y0); /* Copy the pixmap to the window and clean up */ gdk_draw_pixmap (canvas->layout.bin_window, canvas->pixmap_gc, pixmap, 0, 0, x0 + canvas->zoom_xofs, y0 + canvas->zoom_yofs, x1 - x0, y1 - y0); } } } if (px) g_free (px); if (pixmap) gdk_pixmap_unref (pixmap); } /* Expose handler for the canvas */ static gint gnome_canvas_expose (GtkWidget *widget, GdkEventExpose *event) { GnomeCanvas *canvas; GdkRectangle *rects; gint n_rects; int i; canvas = GNOME_CANVAS (widget); if (!GTK_WIDGET_DRAWABLE (widget) || (event->window != canvas->layout.bin_window)) return FALSE; #ifdef VERBOSE g_print ("Expose\n"); #endif gdk_region_get_rectangles (event->region, &rects, &n_rects); for (i = 0; i < n_rects; i++) { ArtIRect rect; rect.x0 = rects[i].x - canvas->zoom_xofs; rect.y0 = rects[i].y - canvas->zoom_yofs; rect.x1 = rects[i].x + rects[i].width - canvas->zoom_xofs; rect.y1 = rects[i].y + rects[i].height - canvas->zoom_yofs; if (canvas->need_update || canvas->need_redraw) { ArtUta *uta; /* Update or drawing is scheduled, so just mark exposed area as dirty */ uta = art_uta_from_irect (&rect); gnome_canvas_request_redraw_uta (canvas, uta); } else { /* No pending updates, draw exposed area immediately */ gnome_canvas_paint_rect (canvas, rect.x0, rect.y0, rect.x1, rect.y1); /* And call expose on parent container class */ if (GTK_WIDGET_CLASS (canvas_parent_class)->expose_event) (* GTK_WIDGET_CLASS (canvas_parent_class)->expose_event) ( widget, event); } } g_free (rects); return FALSE; } /* Repaints the areas in the canvas that need it */ static void paint (GnomeCanvas *canvas) { ArtIRect *rects; gint n_rects, i; if (canvas->aa) rects = art_rect_list_from_uta (canvas->redraw_area, IMAGE_WIDTH_AA, IMAGE_HEIGHT_AA, &n_rects); else rects = art_rect_list_from_uta (canvas->redraw_area, IMAGE_WIDTH, IMAGE_HEIGHT, &n_rects); art_uta_free (canvas->redraw_area); canvas->redraw_area = NULL; canvas->need_redraw = FALSE; /* Send synthetic expose events */ for (i = 0; i < n_rects; i++) { GdkEventExpose ex; gint x0, y0, x1, y1; x0 = MAX (canvas->layout.hadjustment->value - canvas->zoom_xofs, rects[i].x0); y0 = MAX (canvas->layout.vadjustment->value - canvas->zoom_yofs, rects[i].y0); x1 = MIN (x0 + GTK_WIDGET (canvas)->allocation.width, rects[i].x1); y1 = MIN (y0 + GTK_WIDGET (canvas)->allocation.height, rects[i].y1); if ((x0 < x1) && (y0 < y1)) { /* Here we are - whatever type is canvas, we have to send synthetic expose to layout (Lauris) */ ex.type = GDK_EXPOSE; ex.window = canvas->layout.bin_window; ex.send_event = TRUE; ex.area.x = x0 + canvas->zoom_xofs; ex.area.y = y0 + canvas->zoom_yofs; ex.area.width = x1 - x0; ex.area.height = y1 - y0; ex.region = gdk_region_rectangle (&ex.area); ex.count = 0; gtk_widget_send_expose (GTK_WIDGET (canvas), (GdkEvent *) &ex); gdk_region_destroy (ex.region); } } art_free (rects); canvas->redraw_x1 = 0; canvas->redraw_y1 = 0; canvas->redraw_x2 = 0; canvas->redraw_y2 = 0; } static void gnome_canvas_draw_background (GnomeCanvas *canvas, GdkDrawable *drawable, int x, int y, int width, int height) { /* By default, we use the style background. */ gdk_gc_set_foreground (canvas->pixmap_gc, >K_WIDGET (canvas)->style->bg[GTK_STATE_NORMAL]); gdk_draw_rectangle (drawable, canvas->pixmap_gc, TRUE, 0, 0, width, height); } static void do_update (GnomeCanvas *canvas) { /* Cause the update if necessary */ update_again: if (canvas->need_update) { gdouble w2cpx[6]; /* We start updating root with w2cpx affine */ w2cpx[0] = canvas->pixels_per_unit; w2cpx[1] = 0.0; w2cpx[2] = 0.0; w2cpx[3] = canvas->pixels_per_unit; w2cpx[4] = -canvas->scroll_x1 * canvas->pixels_per_unit; w2cpx[5] = -canvas->scroll_y1 * canvas->pixels_per_unit; gnome_canvas_item_invoke_update (canvas->root, w2cpx, NULL, 0); canvas->need_update = FALSE; } /* Pick new current item */ while (canvas->need_repick) { canvas->need_repick = FALSE; pick_current_item (canvas, &canvas->pick_event); } /* it is possible that during picking we emitted an event in which the user then called some function which then requested update of something. Without this we'd be left in a state where need_update would have been left TRUE and the canvas would have been left unpainted. */ if (canvas->need_update) { goto update_again; } /* Paint if able to */ if (GTK_WIDGET_DRAWABLE (canvas) && canvas->need_redraw) paint (canvas); } /* Idle handler for the canvas. It deals with pending updates and redraws. */ static gboolean idle_handler (gpointer data) { GnomeCanvas *canvas; GDK_THREADS_ENTER (); canvas = GNOME_CANVAS (data); do_update (canvas); /* Reset idle id */ canvas->idle_id = 0; GDK_THREADS_LEAVE (); return FALSE; } /* Convenience function to add an idle handler to a canvas */ static void add_idle (GnomeCanvas *canvas) { g_assert (canvas->need_update || canvas->need_redraw); if (!canvas->idle_id) canvas->idle_id = g_idle_add_full (CANVAS_IDLE_PRIORITY, idle_handler, canvas, NULL); /* canvas->idle_id = gtk_idle_add (idle_handler, canvas); */ } /** * gnome_canvas_root: * @canvas: A canvas. * * Queries the root group of a canvas. * * Return value: The root group of the specified canvas. **/ GnomeCanvasGroup * gnome_canvas_root (GnomeCanvas *canvas) { g_return_val_if_fail (GNOME_IS_CANVAS (canvas), NULL); return GNOME_CANVAS_GROUP (canvas->root); } /** * gnome_canvas_set_scroll_region: * @canvas: A canvas. * @x1: Leftmost limit of the scrolling region. * @y1: Upper limit of the scrolling region. * @x2: Rightmost limit of the scrolling region. * @y2: Lower limit of the scrolling region. * * Sets the scrolling region of a canvas to the specified rectangle. The canvas * will then be able to scroll only within this region. The view of the canvas * is adjusted as appropriate to display as much of the new region as possible. **/ void gnome_canvas_set_scroll_region (GnomeCanvas *canvas, double x1, double y1, double x2, double y2) { double wxofs, wyofs; int xofs, yofs; g_return_if_fail (GNOME_IS_CANVAS (canvas)); /* * Set the new scrolling region. If possible, do not move the visible contents of the * canvas. */ gnome_canvas_c2w (canvas, GTK_LAYOUT (canvas)->hadjustment->value + canvas->zoom_xofs, GTK_LAYOUT (canvas)->vadjustment->value + canvas->zoom_yofs, /*canvas->zoom_xofs, canvas->zoom_yofs,*/ &wxofs, &wyofs); canvas->scroll_x1 = x1; canvas->scroll_y1 = y1; canvas->scroll_x2 = x2; canvas->scroll_y2 = y2; gnome_canvas_w2c (canvas, wxofs, wyofs, &xofs, &yofs); scroll_to (canvas, xofs, yofs); canvas->need_repick = TRUE; #if 0 /* todo: should be requesting update */ (* GNOME_CANVAS_ITEM_CLASS (canvas->root->object.klass)->update) ( canvas->root, NULL, NULL, 0); #endif } /** * gnome_canvas_get_scroll_region: * @canvas: A canvas. * @x1: Leftmost limit of the scrolling region (return value). * @y1: Upper limit of the scrolling region (return value). * @x2: Rightmost limit of the scrolling region (return value). * @y2: Lower limit of the scrolling region (return value). * * Queries the scrolling region of a canvas. **/ void gnome_canvas_get_scroll_region (GnomeCanvas *canvas, double *x1, double *y1, double *x2, double *y2) { g_return_if_fail (GNOME_IS_CANVAS (canvas)); if (x1) *x1 = canvas->scroll_x1; if (y1) *y1 = canvas->scroll_y1; if (x2) *x2 = canvas->scroll_x2; if (y2) *y2 = canvas->scroll_y2; } /** * gnome_canvas_set_center_scroll_region: * @canvas: A canvas. * @center_scroll_region: Whether to center the scrolling region in the canvas * window when it is smaller than the canvas' allocation. * * When the scrolling region of the canvas is smaller than the canvas window, * e.g. the allocation of the canvas, it can be either centered on the window * or simply made to be on the upper-left corner on the window. This function * lets you configure this property. **/ void gnome_canvas_set_center_scroll_region (GnomeCanvas *canvas, gboolean center_scroll_region) { g_return_if_fail (GNOME_IS_CANVAS (canvas)); canvas->center_scroll_region = center_scroll_region != 0; scroll_to (canvas, canvas->layout.hadjustment->value, canvas->layout.vadjustment->value); } /** * gnome_canvas_get_center_scroll_region: * @canvas: A canvas. * * Returns whether the canvas is set to center the scrolling region in the window * if the former is smaller than the canvas' allocation. * * Return value: Whether the scroll region is being centered in the canvas window. **/ gboolean gnome_canvas_get_center_scroll_region (GnomeCanvas *canvas) { g_return_val_if_fail (GNOME_IS_CANVAS (canvas), FALSE); return canvas->center_scroll_region ? TRUE : FALSE; } /** * gnome_canvas_set_pixels_per_unit: * @canvas: A canvas. * @n: The number of pixels that correspond to one canvas unit. * * Sets the zooming factor of a canvas by specifying the number of pixels that * correspond to one canvas unit. * * The anchor point for zooming, i.e. the point that stays fixed and all others * zoom inwards or outwards from it, depends on whether the canvas is set to * center the scrolling region or not. You can control this using the * gnome_canvas_set_center_scroll_region() function. If the canvas is set to * center the scroll region, then the center of the canvas window is used as the * anchor point for zooming. Otherwise, the upper-left corner of the canvas * window is used as the anchor point. **/ void gnome_canvas_set_pixels_per_unit (GnomeCanvas *canvas, double n) { double ax, ay; int x1, y1; int anchor_x, anchor_y; g_return_if_fail (GNOME_IS_CANVAS (canvas)); g_return_if_fail (n > GNOME_CANVAS_EPSILON); if (canvas->center_scroll_region) { anchor_x = GTK_WIDGET (canvas)->allocation.width / 2; anchor_y = GTK_WIDGET (canvas)->allocation.height / 2; } else anchor_x = anchor_y = 0; /* Find the coordinates of the anchor point in units. */ if(canvas->layout.hadjustment) { ax = (canvas->layout.hadjustment->value + anchor_x) / canvas->pixels_per_unit + canvas->scroll_x1 + canvas->zoom_xofs; } else { ax = (0.0 + anchor_x) / canvas->pixels_per_unit + canvas->scroll_x1 + canvas->zoom_xofs; } if(canvas->layout.hadjustment) { ay = (canvas->layout.vadjustment->value + anchor_y) / canvas->pixels_per_unit + canvas->scroll_y1 + canvas->zoom_yofs; } else { ay = (0.0 + anchor_y) / canvas->pixels_per_unit + canvas->scroll_y1 + canvas->zoom_yofs; } /* Now calculate the new offset of the upper left corner. */ x1 = ((ax - canvas->scroll_x1) * n) - anchor_x; y1 = ((ay - canvas->scroll_y1) * n) - anchor_y; canvas->pixels_per_unit = n; scroll_to (canvas, x1, y1); if (!(canvas->root->object.flags & GNOME_CANVAS_ITEM_NEED_AFFINE)) { canvas->root->object.flags |= GNOME_CANVAS_ITEM_NEED_AFFINE; gnome_canvas_request_update (canvas); } canvas->need_repick = TRUE; } /** * gnome_canvas_scroll_to: * @canvas: A canvas. * @cx: Horizontal scrolling offset in canvas pixel units. * @cy: Vertical scrolling offset in canvas pixel units. * * Makes a canvas scroll to the specified offsets, given in canvas pixel units. * The canvas will adjust the view so that it is not outside the scrolling * region. This function is typically not used, as it is better to hook * scrollbars to the canvas layout's scrolling adjusments. **/ void gnome_canvas_scroll_to (GnomeCanvas *canvas, int cx, int cy) { g_return_if_fail (GNOME_IS_CANVAS (canvas)); scroll_to (canvas, cx, cy); } /** * gnome_canvas_get_scroll_offsets: * @canvas: A canvas. * @cx: Horizontal scrolling offset (return value). * @cy: Vertical scrolling offset (return value). * * Queries the scrolling offsets of a canvas. The values are returned in canvas * pixel units. **/ void gnome_canvas_get_scroll_offsets (GnomeCanvas *canvas, int *cx, int *cy) { g_return_if_fail (GNOME_IS_CANVAS (canvas)); if (cx) *cx = canvas->layout.hadjustment->value; if (cy) *cy = canvas->layout.vadjustment->value; } /** * gnome_canvas_update_now: * @canvas: A canvas. * * Forces an immediate update and redraw of a canvas. If the canvas does not * have any pending update or redraw requests, then no action is taken. This is * typically only used by applications that need explicit control of when the * display is updated, like games. It is not needed by normal applications. */ void gnome_canvas_update_now (GnomeCanvas *canvas) { g_return_if_fail (GNOME_IS_CANVAS (canvas)); if (!(canvas->need_update || canvas->need_redraw)) { g_assert (canvas->idle_id == 0); g_assert (canvas->redraw_area == NULL); return; } remove_idle (canvas); do_update (canvas); } /** * gnome_canvas_get_item_at: * @canvas: A canvas. * @x: X position in world coordinates. * @y: Y position in world coordinates. * * Looks for the item that is under the specified position, which must be * specified in world coordinates. * * Return value: The sought item, or NULL if no item is at the specified * coordinates. **/ GnomeCanvasItem * gnome_canvas_get_item_at (GnomeCanvas *canvas, double x, double y) { GnomeCanvasItem *item; double dist; int cx, cy; g_return_val_if_fail (GNOME_IS_CANVAS (canvas), NULL); gnome_canvas_w2c (canvas, x, y, &cx, &cy); dist = gnome_canvas_item_invoke_point (canvas->root, x, y, cx, cy, &item); if ((int) (dist * canvas->pixels_per_unit + 0.5) <= canvas->close_enough) return item; else return NULL; } /* Queues an update of the canvas */ static void gnome_canvas_request_update (GnomeCanvas *canvas) { GNOME_CANVAS_GET_CLASS (canvas)->request_update (canvas); } static void gnome_canvas_request_update_real (GnomeCanvas *canvas) { if (canvas->need_update) return; canvas->need_update = TRUE; if (GTK_WIDGET_MAPPED ((GtkWidget *) canvas)) add_idle (canvas); } /* Computes the union of two microtile arrays while clipping the result to the * specified rectangle. Any of the specified utas can be NULL, in which case it * is taken to be an empty region. */ static ArtUta * uta_union_clip (ArtUta *uta1, ArtUta *uta2, ArtIRect *clip) { ArtUta *uta; ArtUtaBbox *utiles; int clip_x1, clip_y1, clip_x2, clip_y2; int union_x1, union_y1, union_x2, union_y2; int new_x1, new_y1, new_x2, new_y2; int x, y; int ofs, ofs1, ofs2; g_assert (clip != NULL); /* Compute the tile indices for the clipping rectangle */ clip_x1 = clip->x0 >> ART_UTILE_SHIFT; clip_y1 = clip->y0 >> ART_UTILE_SHIFT; clip_x2 = (clip->x1 >> ART_UTILE_SHIFT) + 1; clip_y2 = (clip->y1 >> ART_UTILE_SHIFT) + 1; /* Get the union of the bounds of both utas */ if (!uta1) { if (!uta2) return art_uta_new (clip_x1, clip_y1, clip_x1 + 1, clip_y1 + 1); union_x1 = uta2->x0; union_y1 = uta2->y0; union_x2 = uta2->x0 + uta2->width; union_y2 = uta2->y0 + uta2->height; } else { if (!uta2) { union_x1 = uta1->x0; union_y1 = uta1->y0; union_x2 = uta1->x0 + uta1->width; union_y2 = uta1->y0 + uta1->height; } else { union_x1 = MIN (uta1->x0, uta2->x0); union_y1 = MIN (uta1->y0, uta2->y0); union_x2 = MAX (uta1->x0 + uta1->width, uta2->x0 + uta2->width); union_y2 = MAX (uta1->y0 + uta1->height, uta2->y0 + uta2->height); } } /* Clip the union of the bounds */ new_x1 = MAX (clip_x1, union_x1); new_y1 = MAX (clip_y1, union_y1); new_x2 = MIN (clip_x2, union_x2); new_y2 = MIN (clip_y2, union_y2); if (new_x1 >= new_x2 || new_y1 >= new_y2) return art_uta_new (clip_x1, clip_y1, clip_x1 + 1, clip_y1 + 1); /* Make the new clipped union */ uta = art_new (ArtUta, 1); uta->x0 = new_x1; uta->y0 = new_y1; uta->width = new_x2 - new_x1; uta->height = new_y2 - new_y1; uta->utiles = utiles = art_new (ArtUtaBbox, uta->width * uta->height); ofs = 0; ofs1 = ofs2 = 0; for (y = new_y1; y < new_y2; y++) { if (uta1) ofs1 = (y - uta1->y0) * uta1->width + new_x1 - uta1->x0; if (uta2) ofs2 = (y - uta2->y0) * uta2->width + new_x1 - uta2->x0; for (x = new_x1; x < new_x2; x++) { ArtUtaBbox bb1, bb2, bb; if (!uta1 || x < uta1->x0 || y < uta1->y0 || x >= uta1->x0 + uta1->width || y >= uta1->y0 + uta1->height) bb1 = 0; else bb1 = uta1->utiles[ofs1]; if (!uta2 || x < uta2->x0 || y < uta2->y0 || x >= uta2->x0 + uta2->width || y >= uta2->y0 + uta2->height) bb2 = 0; else bb2 = uta2->utiles[ofs2]; if (bb1 == 0) bb = bb2; else if (bb2 == 0) bb = bb1; else bb = ART_UTA_BBOX_CONS (MIN (ART_UTA_BBOX_X0 (bb1), ART_UTA_BBOX_X0 (bb2)), MIN (ART_UTA_BBOX_Y0 (bb1), ART_UTA_BBOX_Y0 (bb2)), MAX (ART_UTA_BBOX_X1 (bb1), ART_UTA_BBOX_X1 (bb2)), MAX (ART_UTA_BBOX_Y1 (bb1), ART_UTA_BBOX_Y1 (bb2))); utiles[ofs] = bb; ofs++; ofs1++; ofs2++; } } return uta; } static inline void get_visible_region (GnomeCanvas *canvas, ArtIRect *visible) { visible->x0 = canvas->layout.hadjustment->value - canvas->zoom_xofs; visible->y0 = canvas->layout.vadjustment->value - canvas->zoom_yofs; visible->x1 = visible->x0 + GTK_WIDGET (canvas)->allocation.width; visible->y1 = visible->y0 + GTK_WIDGET (canvas)->allocation.height; } /** * gnome_canvas_request_redraw_uta: * @canvas: A canvas. * @uta: Microtile array that specifies the area to be redrawn. It will * be freed by this function, so the argument you pass will be invalid * after you call this function. * * Informs a canvas that the specified area, given as a microtile array, needs * to be repainted. To be used only by item implementations. **/ void gnome_canvas_request_redraw_uta (GnomeCanvas *canvas, ArtUta *uta) { ArtIRect visible; g_return_if_fail (GNOME_IS_CANVAS (canvas)); g_return_if_fail (uta != NULL); if (!GTK_WIDGET_DRAWABLE (canvas)) { art_uta_free (uta); return; } get_visible_region (canvas, &visible); if (canvas->need_redraw) { ArtUta *new_uta; g_assert (canvas->redraw_area != NULL); /* ALEX: This can fail if e.g. redraw_uta is called by an item update function and we're called from update_now -> do_update because update_now sets idle_id == 0. There is also some way to get it from the expose handler (see bug #102811). g_assert (canvas->idle_id != 0); */ new_uta = uta_union_clip (canvas->redraw_area, uta, &visible); art_uta_free (canvas->redraw_area); art_uta_free (uta); canvas->redraw_area = new_uta; if (canvas->idle_id == 0) add_idle (canvas); } else { ArtUta *new_uta; g_assert (canvas->redraw_area == NULL); new_uta = uta_union_clip (uta, NULL, &visible); art_uta_free (uta); canvas->redraw_area = new_uta; canvas->need_redraw = TRUE; add_idle (canvas); } } /** * gnome_canvas_request_redraw: * @canvas: A canvas. * @x1: Leftmost coordinate of the rectangle to be redrawn. * @y1: Upper coordinate of the rectangle to be redrawn. * @x2: Rightmost coordinate of the rectangle to be redrawn, plus 1. * @y2: Lower coordinate of the rectangle to be redrawn, plus 1. * * Convenience function that informs a canvas that the specified rectangle needs * to be repainted. This function converts the rectangle to a microtile array * and feeds it to gnome_canvas_request_redraw_uta(). The rectangle includes * @x1 and @y1, but not @x2 and @y2. To be used only by item implementations. **/ void gnome_canvas_request_redraw (GnomeCanvas *canvas, int x1, int y1, int x2, int y2) { ArtUta *uta; ArtIRect bbox; ArtIRect visible; ArtIRect clip; g_return_if_fail (GNOME_IS_CANVAS (canvas)); if (!GTK_WIDGET_DRAWABLE (canvas) || (x1 >= x2) || (y1 >= y2)) return; bbox.x0 = x1; bbox.y0 = y1; bbox.x1 = x2; bbox.y1 = y2; get_visible_region (canvas, &visible); art_irect_intersect (&clip, &bbox, &visible); if (!art_irect_empty (&clip)) { uta = art_uta_from_irect (&clip); gnome_canvas_request_redraw_uta (canvas, uta); } } /** * gnome_canvas_w2c_affine: * @canvas: A canvas. * @affine: An affine transformation matrix (return value). * * Gets the affine transform that converts from world coordinates to canvas * pixel coordinates. **/ void gnome_canvas_w2c_affine (GnomeCanvas *canvas, double affine[6]) { double zooom; g_return_if_fail (GNOME_IS_CANVAS (canvas)); g_return_if_fail (affine != NULL); zooom = canvas->pixels_per_unit; affine[0] = zooom; affine[1] = 0; affine[2] = 0; affine[3] = zooom; affine[4] = -canvas->scroll_x1 * zooom; affine[5] = -canvas->scroll_y1 * zooom; } /** * gnome_canvas_w2c: * @canvas: A canvas. * @wx: World X coordinate. * @wy: World Y coordinate. * @cx: X pixel coordinate (return value). * @cy: Y pixel coordinate (return value). * * Converts world coordinates into canvas pixel coordinates. **/ void gnome_canvas_w2c (GnomeCanvas *canvas, double wx, double wy, int *cx, int *cy) { double affine[6]; ArtPoint w, c; g_return_if_fail (GNOME_IS_CANVAS (canvas)); gnome_canvas_w2c_affine (canvas, affine); w.x = wx; w.y = wy; art_affine_point (&c, &w, affine); if (cx) *cx = floor (c.x + 0.5); if (cy) *cy = floor (c.y + 0.5); } /** * gnome_canvas_w2c_d: * @canvas: A canvas. * @wx: World X coordinate. * @wy: World Y coordinate. * @cx: X pixel coordinate (return value). * @cy: Y pixel coordinate (return value). * * Converts world coordinates into canvas pixel coordinates. This * version returns coordinates in floating point coordinates, for * greater precision. **/ void gnome_canvas_w2c_d (GnomeCanvas *canvas, double wx, double wy, double *cx, double *cy) { double affine[6]; ArtPoint w, c; g_return_if_fail (GNOME_IS_CANVAS (canvas)); gnome_canvas_w2c_affine (canvas, affine); w.x = wx; w.y = wy; art_affine_point (&c, &w, affine); if (cx) *cx = c.x; if (cy) *cy = c.y; } /** * gnome_canvas_c2w: * @canvas: A canvas. * @cx: Canvas pixel X coordinate. * @cy: Canvas pixel Y coordinate. * @wx: X world coordinate (return value). * @wy: Y world coordinate (return value). * * Converts canvas pixel coordinates to world coordinates. **/ void gnome_canvas_c2w (GnomeCanvas *canvas, int cx, int cy, double *wx, double *wy) { double affine[6], inv[6]; ArtPoint w, c; g_return_if_fail (GNOME_IS_CANVAS (canvas)); gnome_canvas_w2c_affine (canvas, affine); art_affine_invert (inv, affine); c.x = cx; c.y = cy; art_affine_point (&w, &c, inv); if (wx) *wx = w.x; if (wy) *wy = w.y; } /** * gnome_canvas_window_to_world: * @canvas: A canvas. * @winx: Window-relative X coordinate. * @winy: Window-relative Y coordinate. * @worldx: X world coordinate (return value). * @worldy: Y world coordinate (return value). * * Converts window-relative coordinates into world coordinates. You can use * this when you need to convert mouse coordinates into world coordinates, for * example. **/ void gnome_canvas_window_to_world (GnomeCanvas *canvas, double winx, double winy, double *worldx, double *worldy) { g_return_if_fail (GNOME_IS_CANVAS (canvas)); if (worldx) *worldx = canvas->scroll_x1 + ((winx - canvas->zoom_xofs) / canvas->pixels_per_unit); if (worldy) *worldy = canvas->scroll_y1 + ((winy - canvas->zoom_yofs) / canvas->pixels_per_unit); } /** * gnome_canvas_world_to_window: * @canvas: A canvas. * @worldx: World X coordinate. * @worldy: World Y coordinate. * @winx: X window-relative coordinate. * @winy: Y window-relative coordinate. * * Converts world coordinates into window-relative coordinates. **/ void gnome_canvas_world_to_window (GnomeCanvas *canvas, double worldx, double worldy, double *winx, double *winy) { g_return_if_fail (GNOME_IS_CANVAS (canvas)); if (winx) *winx = (canvas->pixels_per_unit)*(worldx - canvas->scroll_x1) + canvas->zoom_xofs; if (winy) *winy = (canvas->pixels_per_unit)*(worldy - canvas->scroll_y1) + canvas->zoom_yofs; } /** * gnome_canvas_get_color: * @canvas: A canvas. * @spec: X color specification, or NULL for "transparent". * @color: Returns the allocated color. * * Allocates a color based on the specified X color specification. As a * convenience to item implementations, it returns TRUE if the color was * allocated, or FALSE if the specification was NULL. A NULL color * specification is considered as "transparent" by the canvas. * * Return value: TRUE if @spec is non-NULL and the color is allocated. If @spec * is NULL, then returns FALSE. **/ int gnome_canvas_get_color (GnomeCanvas *canvas, const char *spec, GdkColor *color) { GdkColormap *colormap; g_return_val_if_fail (GNOME_IS_CANVAS (canvas), FALSE); g_return_val_if_fail (color != NULL, FALSE); if (!spec) { color->pixel = 0; color->red = 0; color->green = 0; color->blue = 0; return FALSE; } gdk_color_parse (spec, color); colormap = gtk_widget_get_colormap (GTK_WIDGET (canvas)); gdk_rgb_find_color (colormap, color); return TRUE; } /** * gnome_canvas_get_color_pixel: * @canvas: A canvas. * @rgba: RGBA color specification. * * Allocates a color from the RGBA value passed into this function. The alpha * opacity value is discarded, since normal X colors do not support it. * * Return value: Allocated pixel value corresponding to the specified color. **/ gulong gnome_canvas_get_color_pixel (GnomeCanvas *canvas, guint rgba) { GdkColormap *colormap; GdkColor color; g_return_val_if_fail (GNOME_IS_CANVAS (canvas), 0); color.red = ((rgba & 0xff000000) >> 16) + ((rgba & 0xff000000) >> 24); color.green = ((rgba & 0x00ff0000) >> 8) + ((rgba & 0x00ff0000) >> 16); color.blue = (rgba & 0x0000ff00) + ((rgba & 0x0000ff00) >> 8); color.pixel = 0; colormap = gtk_widget_get_colormap (GTK_WIDGET (canvas)); gdk_rgb_find_color (colormap, &color); return color.pixel; } /** * gnome_canvas_set_stipple_origin: * @canvas: A canvas. * @gc: GC on which to set the stipple origin. * * Sets the stipple origin of the specified GC as is appropriate for the canvas, * so that it will be aligned with other stipple patterns used by canvas items. * This is typically only needed by item implementations. **/ void gnome_canvas_set_stipple_origin (GnomeCanvas *canvas, GdkGC *gc) { g_return_if_fail (GNOME_IS_CANVAS (canvas)); g_return_if_fail (GDK_IS_GC (gc)); gdk_gc_set_ts_origin (gc, -canvas->draw_xofs, -canvas->draw_yofs); } /** * gnome_canvas_set_dither: * @canvas: A canvas. * @dither: Type of dithering used to render an antialiased canvas. * * Controls dithered rendering for antialiased canvases. The value of * dither should be #GDK_RGB_DITHER_NONE, #GDK_RGB_DITHER_NORMAL, or * #GDK_RGB_DITHER_MAX. The default canvas setting is * #GDK_RGB_DITHER_NORMAL. **/ void gnome_canvas_set_dither (GnomeCanvas *canvas, GdkRgbDither dither) { g_return_if_fail (GNOME_IS_CANVAS (canvas)); canvas->dither = dither; } /** * gnome_canvas_get_dither: * @canvas: A canvas. * * Returns the type of dithering used to render an antialiased canvas. * * Return value: The dither setting. **/ GdkRgbDither gnome_canvas_get_dither (GnomeCanvas *canvas) { g_return_val_if_fail (GNOME_IS_CANVAS (canvas), GDK_RGB_DITHER_NONE); return canvas->dither; } static gboolean boolean_handled_accumulator (GSignalInvocationHint *ihint, GValue *return_accu, const GValue *handler_return, gpointer dummy) { gboolean continue_emission; gboolean signal_handled; signal_handled = g_value_get_boolean (handler_return); g_value_set_boolean (return_accu, signal_handled); continue_emission = !signal_handled; return continue_emission; } /* Class initialization function for GnomeCanvasItemClass */ static void gnome_canvas_item_class_init (GnomeCanvasItemClass *class) { GObjectClass *gobject_class; gobject_class = (GObjectClass *) class; item_parent_class = g_type_class_peek_parent (class); gobject_class->set_property = gnome_canvas_item_set_property; gobject_class->get_property = gnome_canvas_item_get_property; g_object_class_install_property (gobject_class, ITEM_PROP_PARENT, g_param_spec_object ("parent", NULL, NULL, GNOME_TYPE_CANVAS_ITEM, (G_PARAM_READABLE | G_PARAM_WRITABLE))); item_signals[ITEM_EVENT] = g_signal_new ("event", G_TYPE_FROM_CLASS (class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GnomeCanvasItemClass, event), boolean_handled_accumulator, NULL, gnome_canvas_marshal_BOOLEAN__BOXED, G_TYPE_BOOLEAN, 1, GDK_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE); gobject_class->dispose = gnome_canvas_item_dispose; class->realize = gnome_canvas_item_realize; class->unrealize = gnome_canvas_item_unrealize; class->map = gnome_canvas_item_map; class->unmap = gnome_canvas_item_unmap; class->update = gnome_canvas_item_update; }