git.sur5r.net Git - glabels/blob - glabels2/src/view-object.c

   1 /*
   2  *  (GLABELS) Label and Business Card Creation program for GNOME
   3  *
   4  *  view_object.c:  GLabels label object base class
   5  *
   6  *  Copyright (C) 2001-2002  Jim Evins <evins@snaught.com>.
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  21  */
  22
  23 #include <glib.h>
  24
  25 #include "view-object.h"
  26 #include "libart_lgpl/libart.h"
  27
  28 #include "debug.h"
  29
  30 /*========================================================*/
  31 /* Private constants and macros.                          */
  32 /*========================================================*/
  33
  34 /* Used for a workaround for a bug with images when flipped or rotated by 90 degrees. */
  35 #define DELTA_DEG 0.001
  36
  37 /*========================================================*/
  38 /* Private types.                                         */
  39 /*========================================================*/
  40
  41 struct _glViewObjectPrivate {
  42
  43         glView                     *view;
  44         glLabelObject              *object;
  45
  46         GnomeCanvasItem            *group;
  47         glViewHighlight            *highlight;
  48
  49         GtkWidget                  *property_dialog;
  50 };
  51
  52 /*========================================================*/
  53 /* Private globals.                                       */
  54 /*========================================================*/
  55
  56 static GObjectClass *parent_class = NULL;
  57
  58
  59 /*========================================================*/
  60 /* Private function prototypes.                           */
  61 /*========================================================*/
  62
  63 static void     gl_view_object_class_init    (glViewObjectClass   *klass);
  64 static void     gl_view_object_instance_init (glViewObject        *view_object);
  65 static void     gl_view_object_finalize      (GObject             *object);
  66
  67 static void     object_moved_cb              (glLabelObject       *object,
  68                                               gdouble              x,
  69                                               gdouble              y,
  70                                               glViewObject        *view_object);
  71
  72 static void     raise_object_cb              (glLabelObject       *object,
  73                                               glViewObject        *view_object);
  74
  75 static void     lower_object_cb              (glLabelObject       *object,
  76                                               glViewObject        *view_object);
  77
  78 static void     flip_rotate_object_cb        (glLabelObject       *object,
  79                                               glViewObject        *view_object);
  80
  81
  82 \f
  83 /*****************************************************************************/
  84 /* Boilerplate object stuff.                                                 */
  85 /*****************************************************************************/
  86 GType
  87 gl_view_object_get_type (void)
  88 {
  89         static GType type = 0;
  90
  91         if (!type) {
  92                 GTypeInfo info = {
  93                         sizeof (glViewObjectClass),
  94                         NULL,
  95                         NULL,
  96                         (GClassInitFunc) gl_view_object_class_init,
  97                         NULL,
  98                         NULL,
  99                         sizeof (glViewObject),
 100                         0,
 101                         (GInstanceInitFunc) gl_view_object_instance_init,
 102                 };
 103
 104                 type = g_type_register_static (G_TYPE_OBJECT,
 105                                                "glViewObject", &info, 0);
 106         }
 107
 108         return type;
 109 }
 110
 111 static void
 112 gl_view_object_class_init (glViewObjectClass *klass)
 113 {
 114         GObjectClass *object_class = (GObjectClass *) klass;
 115
 116         gl_debug (DEBUG_VIEW, "START");
 117
 118         parent_class = g_type_class_peek_parent (klass);
 119
 120         object_class->finalize = gl_view_object_finalize;
 121
 122         gl_debug (DEBUG_VIEW, "END");
 123 }
 124
 125 static void
 126 gl_view_object_instance_init (glViewObject *view_object)
 127 {
 128         gl_debug (DEBUG_VIEW, "START");
 129
 130         view_object->private = g_new0 (glViewObjectPrivate, 1);
 131
 132         gl_debug (DEBUG_VIEW, "END");
 133 }
 134
 135 static void
 136 gl_view_object_finalize (GObject *object)
 137 {
 138         glLabel       *parent;
 139         glView        *view;
 140
 141         gl_debug (DEBUG_VIEW, "START");
 142
 143         g_return_if_fail (object && GL_IS_VIEW_OBJECT (object));
 144
 145         view = GL_VIEW_OBJECT(object)->private->view;
 146         view->object_list = g_list_remove (view->object_list, object);
 147         view->selected_object_list =
 148                 g_list_remove (view->selected_object_list, object);
 149
 150         g_object_unref (GL_VIEW_OBJECT(object)->private->object);
 151         g_object_unref (G_OBJECT(GL_VIEW_OBJECT(object)->private->highlight));
 152         gtk_object_destroy (GTK_OBJECT(GL_VIEW_OBJECT(object)->private->group));
 153         if (GL_VIEW_OBJECT(object)->private->property_dialog) {
 154                 gtk_object_destroy (GTK_OBJECT(GL_VIEW_OBJECT(object)->private->property_dialog));
 155         }
 156
 157         G_OBJECT_CLASS (parent_class)->finalize (object);
 158
 159         gl_debug (DEBUG_VIEW, "END");
 160 }
 161
 162 /*****************************************************************************/
 163 /* NEW object view.                                                          */
 164 /*****************************************************************************/
 165 GObject *
 166 gl_view_object_new (void)
 167 {
 168         glViewObject *view_object;
 169
 170         gl_debug (DEBUG_VIEW, "START");
 171
 172         view_object = g_object_new (gl_view_object_get_type(), NULL);
 173
 174         gl_debug (DEBUG_VIEW, "END");
 175
 176         return G_OBJECT (view_object);
 177 }
 178
 179 /*****************************************************************************/
 180 /* Set parent view to which this object view belongs.                        */
 181 /*****************************************************************************/
 182 void
 183 gl_view_object_set_view       (glViewObject *view_object,
 184                                glView *view)
 185 {
 186         gl_debug (DEBUG_VIEW, "START");
 187
 188         g_return_if_fail (view_object && GL_IS_VIEW_OBJECT (view_object));
 189         g_return_if_fail (view && GL_IS_VIEW (view));
 190
 191         view_object->private->view = view;
 192
 193         view->object_list = g_list_prepend (view->object_list, view_object);
 194
 195         gl_debug (DEBUG_VIEW, "END");
 196 }
 197
 198 /*****************************************************************************/
 199 /* Set Label object to follow.                                               */
 200 /*****************************************************************************/
 201 void
 202 gl_view_object_set_object     (glViewObject         *view_object,
 203                                glLabelObject        *object,
 204                                glViewHighlightStyle style)
 205 {
 206         GnomeCanvas        *canvas;
 207         GnomeCanvasGroup   *root;
 208         gdouble            x, y, w, h;
 209
 210         gl_debug (DEBUG_VIEW, "START");
 211
 212         g_return_if_fail (view_object && GL_IS_VIEW_OBJECT (view_object));
 213         g_return_if_fail (object && GL_IS_LABEL_OBJECT (object));
 214
 215         view_object->private->object = object;
 216
 217         gl_label_object_get_position (GL_LABEL_OBJECT(object), &x, &y);
 218         gl_label_object_get_size (GL_LABEL_OBJECT(object), &w, &h);
 219
 220         /* create canvas group to contain items representing object */
 221         view_object->private->group =
 222                 gnome_canvas_item_new (view_object->private->view->label_group,
 223                                        gnome_canvas_group_get_type (),
 224                                        "x", x,
 225                                        "y", y,
 226                                        NULL);
 227
 228         /* Create appropriate selection highlight canvas item. */
 229         view_object->private->highlight =
 230                 GL_VIEW_HIGHLIGHT (gl_view_highlight_new (view_object, style));
 231
 232         g_signal_connect (G_OBJECT (object), "moved",
 233                           G_CALLBACK (object_moved_cb),
 234                           view_object);
 235
 236         g_signal_connect (G_OBJECT (object), "top",
 237                           G_CALLBACK (raise_object_cb),
 238                           view_object);
 239
 240         g_signal_connect (G_OBJECT (object), "bottom",
 241                           G_CALLBACK (lower_object_cb),
 242                           view_object);
 243
 244         g_signal_connect (G_OBJECT (object), "flip_rotate",
 245                           G_CALLBACK (flip_rotate_object_cb),
 246                           view_object);
 247
 248         g_signal_connect (G_OBJECT (view_object->private->group), "event",
 249                           G_CALLBACK (gl_view_item_event_handler),
 250                           view_object);
 251
 252         gl_debug (DEBUG_VIEW, "END");
 253 }
 254
 255 /*****************************************************************************/
 256 /* Return parent view associated with this view.                             */
 257 /*****************************************************************************/
 258 glView *
 259 gl_view_object_get_view   (glViewObject *view_object)
 260 {
 261         gl_debug (DEBUG_VIEW, "START");
 262
 263         g_return_if_fail (view_object && GL_IS_VIEW_OBJECT (view_object));
 264
 265         gl_debug (DEBUG_VIEW, "END");
 266
 267         return view_object->private->view;
 268 }
 269
 270 /*****************************************************************************/
 271 /* Return label object that we are following.                                */
 272 /*****************************************************************************/
 273 glLabelObject *
 274 gl_view_object_get_object (glViewObject *view_object)
 275 {
 276         gl_debug (DEBUG_VIEW, "START");
 277
 278         g_return_if_fail (view_object && GL_IS_VIEW_OBJECT (view_object));
 279
 280         gl_debug (DEBUG_VIEW, "END");
 281
 282         return view_object->private->object;
 283 }
 284
 285 /*****************************************************************************/
 286 /* Return canvas item representing our object in this view.                  */
 287 /*****************************************************************************/
 288 GnomeCanvasItem *
 289 gl_view_object_get_group   (glViewObject *view_object)
 290 {
 291         gl_debug (DEBUG_VIEW, "START");
 292
 293         g_return_if_fail (view_object && GL_IS_VIEW_OBJECT (view_object));
 294
 295         gl_debug (DEBUG_VIEW, "END");
 296
 297         return view_object->private->group;
 298 }
 299
 300 /*****************************************************************************/
 301 /* Create canvas item for this object.                                       */
 302 /*****************************************************************************/
 303 GnomeCanvasItem *
 304 gl_view_object_item_new (glViewObject *view_object,
 305                          GType         type,
 306                          const gchar  *first_arg_name,
 307                          ...)
 308 {
 309         GnomeCanvasItem *item;
 310         va_list          args;
 311         gdouble          affine[6], delta_affine[6];
 312
 313         gl_debug (DEBUG_VIEW, "START");
 314
 315         g_return_val_if_fail (view_object && GL_IS_VIEW_OBJECT (view_object), NULL);
 316
 317         item = gnome_canvas_item_new (GNOME_CANVAS_GROUP(view_object->private->group),
 318                                       type, NULL);
 319
 320         va_start (args, first_arg_name);
 321         gnome_canvas_item_set_valist (item, first_arg_name, args);
 322         va_end (args);
 323
 324         gl_label_object_get_applied_affine (view_object->private->object, affine);
 325
 326         /* Apply a very small rotation, fixes problems with flipped or rotated images */
 327         art_affine_rotate (delta_affine, DELTA_DEG);
 328         art_affine_multiply (affine, affine, delta_affine);
 329
 330         gnome_canvas_item_affine_absolute (item, affine);
 331
 332         gl_debug (DEBUG_VIEW, "END");
 333
 334         return item;
 335 }
 336
 337 /*****************************************************************************/
 338 /* Highlight view of object.                                                 */
 339 /*****************************************************************************/
 340 void
 341 gl_view_object_show_highlight     (glViewObject *view_object)
 342 {
 343         gl_debug (DEBUG_VIEW, "START");
 344
 345         g_return_if_fail (view_object && GL_IS_VIEW_OBJECT (view_object));
 346         g_return_if_fail (view_object->private->highlight);
 347
 348         gl_view_highlight_show (view_object->private->highlight);
 349
 350         gl_debug (DEBUG_VIEW, "END");
 351 }
 352
 353 /*****************************************************************************/
 354 /* Remove highlight from view of object.                                     */
 355 /*****************************************************************************/
 356 void
 357 gl_view_object_hide_highlight   (glViewObject *view_object)
 358 {
 359         gl_debug (DEBUG_VIEW, "START");
 360
 361         g_return_if_fail (view_object && GL_IS_VIEW_OBJECT (view_object));
 362         g_return_if_fail (view_object->private->highlight);
 363
 364         gl_view_highlight_hide (view_object->private->highlight);
 365
 366         gl_debug (DEBUG_VIEW, "END");
 367 }
 368
 369
 370 /*****************************************************************************/
 371 /* Show property dialog.                                                     */
 372 /*****************************************************************************/
 373 void
 374 gl_view_object_show_dialog (glViewObject *view_object)
 375 {
 376         gl_debug (DEBUG_VIEW, "START");
 377
 378         g_return_if_fail (view_object && GL_IS_VIEW_OBJECT (view_object));
 379
 380         if (view_object->private->property_dialog != NULL) {
 381                 gtk_window_present (GTK_WINDOW (view_object->private->property_dialog));
 382                 return;
 383         }
 384
 385         if ( GL_VIEW_OBJECT_GET_CLASS(view_object)->construct_dialog != NULL ) {
 386
 387                 view_object->private->property_dialog =
 388                         GL_VIEW_OBJECT_GET_CLASS(view_object)->construct_dialog (view_object);
 389
 390                 g_signal_connect (G_OBJECT (view_object->private->property_dialog),
 391                                   "destroy",
 392                                   G_CALLBACK (gtk_widget_destroyed),
 393                                   &view_object->private->property_dialog);
 394
 395                 gtk_widget_show_all (view_object->private->property_dialog);
 396
 397         }
 398
 399
 400         gl_debug (DEBUG_VIEW, "END");
 401 }
 402
 403
 404 /*---------------------------------------------------------------------------*/
 405 /* PRIVATE.  Object moved callback.                                          */
 406 /*---------------------------------------------------------------------------*/
 407 static void
 408 object_moved_cb (glLabelObject *object,
 409                  gdouble        dx,
 410                  gdouble        dy,
 411                  glViewObject  *view_object)
 412 {
 413         gl_debug (DEBUG_VIEW, "START");
 414
 415         /* Adjust location of analogous canvas group. */
 416         gnome_canvas_item_move (view_object->private->group, dx, dy);
 417
 418         gl_debug (DEBUG_VIEW, "END");
 419 }
 420
 421 /*---------------------------------------------------------------------------*/
 422 /* PRIVATE.  raise item to front callback.                                   */
 423 /*---------------------------------------------------------------------------*/
 424 static void
 425 raise_object_cb (glLabelObject *object,
 426                  glViewObject  *view_object)
 427 {
 428         gl_debug (DEBUG_VIEW, "START");
 429
 430         /* send to top */
 431         gnome_canvas_item_raise_to_top (view_object->private->group);
 432
 433         gl_debug (DEBUG_VIEW, "END");
 434 }
 435
 436 /*---------------------------------------------------------------------------*/
 437 /* PRIVATE.  lower item to back callback.                                    */
 438 /*---------------------------------------------------------------------------*/
 439 static void
 440 lower_object_cb (glLabelObject *object,
 441                  glViewObject  *view_object)
 442 {
 443         gl_debug (DEBUG_VIEW, "START");
 444
 445         /* Send to bottom */
 446         gnome_canvas_item_lower_to_bottom (view_object->private->group);
 447
 448         gl_debug (DEBUG_VIEW, "END");
 449 }
 450
 451 /*---------------------------------------------------------------------------*/
 452 /* PRIVATE.  Flip/rotate object callback.                                    */
 453 /*---------------------------------------------------------------------------*/
 454 static void
 455 flip_rotate_object_cb (glLabelObject *object,
 456                        glViewObject  *view_object)
 457 {
 458         gdouble          affine[6], delta_affine[6];
 459         GList           *p, *item_list;
 460         GnomeCanvasItem *item;
 461
 462         gl_debug (DEBUG_VIEW, "START");
 463
 464         gl_label_object_get_applied_affine (object, affine);
 465
 466         /* Apply a very small rotation, fixes problems with flipped or rotated images */
 467         art_affine_rotate (delta_affine, DELTA_DEG);
 468         art_affine_multiply (affine, affine, delta_affine);
 469
 470         item_list = GNOME_CANVAS_GROUP(view_object->private->group)->item_list;
 471         for ( p=item_list; p != NULL; p=p->next ) {
 472                 item = GNOME_CANVAS_ITEM(p->data);
 473                 gnome_canvas_item_affine_absolute (item, affine);
 474         }
 475
 476         gl_debug (DEBUG_VIEW, "END");
 477 }
 478
 479 /*****************************************************************************/
 480 /* Select object.                                                            */
 481 /*****************************************************************************/
 482 void
 483 gl_view_object_select (glViewObject *view_object)
 484 {
 485         gl_debug (DEBUG_VIEW, "START");
 486
 487         gl_view_select_object(view_object->private->view, view_object);
 488
 489         gl_debug (DEBUG_VIEW, "END");
 490 }
 491