app/textedit.c

   1 /* Dia -- an diagram creation/manipulation program
   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 /** This file handles the display part of text edit stuff: Making text
  20  * edit start and stop at the right time and highlighting the edits.
  21  * lib/text.c and lib/focus.c handles internal things like who can have
  22  * focus and how to enter text.  app/disp_callbacks.c handles the actual
  23  * keystrokes.
  24  *
  25  * There's an invariant that all objects in the focus list must be selected.
  26  */
  27
  28 #include <config.h>
  29
  30 #include "object.h"
  31 #include "focus.h"
  32 #include "display.h"
  33 #include "highlight.h"
  34 #include "textedit.h"
  35 #include "object_ops.h"
  36 #include "text.h"
  37
  38 /** Move the text edit focus either backwards or forwards. */
  39 Focus *
  40 textedit_move_focus(DDisplay *ddisp, Focus *focus, gboolean forwards)
  41 {
  42   if (focus != NULL) {
  43     /* Leak of focus highlight color here, but should it be handled
  44        by highlight or by us?
  45     */
  46     highlight_object_off(focus->obj, ddisp->diagram);
  47     object_add_updates(focus->obj, ddisp->diagram);
  48   }
  49   if (forwards)
  50     focus_next();
  51   else
  52     focus_previous();
  53   focus = active_focus();
  54
  55   if (focus != NULL) {
  56     Color *focus_col = color_new_rgb(1.0, 1.0, 0.0);
  57     highlight_object(focus->obj, focus_col, ddisp->diagram);
  58     object_add_updates(focus->obj, ddisp->diagram);
  59   }
  60   diagram_flush(ddisp->diagram);
  61   return focus;
  62 }
  63
  64 /** Call when something recieves an actual focus (not to be confused
  65  * with doing request_focus(), which merely puts one in the focus list).
  66  */
  67 void
  68 textedit_activate_focus(DDisplay *ddisp, Focus *focus, Point *clicked)
  69 {
  70   if (active_focus()) {
  71     Focus *old_focus = active_focus();
  72     object_add_updates(old_focus->obj, ddisp->diagram);
  73     highlight_object_off(old_focus->obj, ddisp->diagram);
  74   }
  75   highlight_object(focus->obj, color_new_rgb(1.0, 1.0, 0.0), ddisp->diagram);
  76   if (clicked) {
  77       text_set_cursor((Text*)focus->user_data, clicked, ddisp->renderer);
  78   }
  79   object_add_updates(focus->obj, ddisp->diagram);
  80   give_focus(focus);
  81   diagram_flush(ddisp->diagram);
  82 }
  83
  84 /** Call when an object is chosen for activation (e.g. due to creation).
  85  */
  86 void
  87 textedit_activate_object(DDisplay *ddisp, DiaObject *obj, Point *clicked)
  88 {
  89   if (active_focus()) {
  90     Focus *focus = active_focus();
  91     highlight_object_off(focus->obj, ddisp->diagram);
  92     object_add_updates(focus->obj, ddisp->diagram);
  93   }
  94   if (give_focus_to_object(obj)) {
  95     highlight_object(obj, color_new_rgb(1.0, 1.0, 0.0), ddisp->diagram);
  96     if (clicked) {
  97       text_set_cursor((Text*)active_focus()->user_data, clicked, ddisp->renderer);
  98     }
  99     object_add_updates(obj, ddisp->diagram);
 100     diagram_flush(ddisp->diagram);
 101   }
 102 }
 103
 104 /** Call when something causes the text focus to disappear.
 105  * Does not remove objects from the focus list, but removes the
 106  * focus highlight and stuff.
 107  * Calling remove_focus on the active object or remove_focus_all
 108  * implies deactivating the focus. */
 109 void
 110 textedit_deactivate_focus()
 111 {
 112   Focus *focus = active_focus();
 113   if (focus != NULL) {
 114     highlight_object_off(focus->obj, ddisplay_active()->diagram);
 115     remove_focus();
 116   }
 117 }
 118
 119 /** Call when something should be removed from the focus list */
 120 void
 121 textedit_remove_focus(DiaObject *obj, Diagram *diagram)
 122 {
 123   if (remove_focus_object(obj)) {
 124     highlight_object_off(obj, ddisplay_active()->diagram);
 125   }
 126 }
 127
 128 /** Call when the entire list of focusable texts gets reset. */
 129 void
 130 textedit_remove_focus_all(Diagram *diagram)
 131 {
 132   Focus *focus = active_focus();
 133   if (focus != NULL) {
 134     highlight_object_off(focus->obj, diagram);
 135   }
 136   reset_foci();
 137 }