app/highlight.c

   1 /* Dia -- an diagram creation/manipulation program -*- c -*-
   2  * Copyright (C) 1998 Alexander Larsson
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  */
  18
  19 #include "highlight.h"
  20
  21 #include "glib.h"
  22
  23 #include "diagram.h"
  24 #include "diagramdata.h"
  25 #include "object.h"
  26 #include "object_ops.h"
  27 #include "group.h"
  28
  29 /* One could argue that the actual setting of the object's field
  30  * should happen inside lib rather than app.  I think that'd be overkill.
  31  * -Lars
  32  */
  33
  34 /* The highlighting must happen within a certain small area around the bbox.
  35  * Highlighting sets the bbox to ... some more.
  36  * Problem:  The bbox is the same for all views, but highlighting size should
  37  * depend on the zoom level.  The renderer obviously can figure out to make
  38  * it a few more pixels or something, but we need the bbox to also be
  39  * enlarged by a bit.  I guess the object_add_updates call must handle that,
  40  * as it knows about the conversion.
  41  */
  42
  43 static Color red = { 1.0, 0.0, 0.0 };
  44
  45 void
  46 highlight_object(DiaObject *obj, Color *col, Diagram *dia)
  47 {
  48   if (col)
  49     obj->highlight_color = col;
  50   else
  51     obj->highlight_color = &red;
  52
  53   object_add_updates(obj, dia);
  54 }
  55
  56 void
  57 highlight_object_off(DiaObject *obj, Diagram *dia)
  58 {
  59   if (obj->highlight_color != NULL) {
  60     /* Must add updates first, so we get the border erased. */
  61     object_add_updates(obj, dia);
  62     obj->highlight_color = NULL;
  63   }
  64 }
  65
  66 /** Resets all highlighting in this layer.  Helper function for
  67  * highlight_reset_all
  68  */
  69 static void
  70 highlight_reset_objects(GList *objects, Diagram *dia)
  71 {
  72   for (; objects != NULL; objects = g_list_next(objects)) {
  73     DiaObject *object = (DiaObject*)objects->data;
  74     highlight_object_off(object, dia);
  75     if (IS_GROUP(object)) {
  76       highlight_reset_objects(group_objects(object), dia);
  77     }
  78   }
  79 }
  80
  81 /* Currently does a brute-force run-through of all objects.
  82  * If this is too slow, we could create a list of currently highlighted
  83  * objects in the diagram and traverse that before killing it.
  84  * Note that we're not assuming that all highlighted objects are in
  85  * the active layer.
  86  */
  87 void
  88 highlight_reset_all(Diagram *dia) {
  89   int i;
  90   for (i = 0; i < dia->data->layers->len; i++) {
  91     highlight_reset_objects(((Layer*)g_ptr_array_index(dia->data->layers, i))->objects, dia);
  92   }
  93 }