app/diacanvas.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library 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 GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GTK+ Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #include "diacanvas.h"
  28 #include "intl.h"
  29
  30 enum {
  31   CHILD_PROP_0,
  32   CHILD_PROP_X,
  33   CHILD_PROP_Y
  34 };
  35
  36 static void dia_canvas_class_init    (DiaCanvasClass    *klass);
  37 static void dia_canvas_init          (DiaCanvas         *canvas);
  38 static void dia_canvas_realize       (GtkWidget        *widget);
  39 static void dia_canvas_size_request  (GtkWidget        *widget,
  40                                      GtkRequisition   *requisition);
  41 static void dia_canvas_size_allocate (GtkWidget        *widget,
  42                                      GtkAllocation    *allocation);
  43 static void dia_canvas_add           (GtkContainer     *container,
  44                                      GtkWidget        *widget);
  45 static void dia_canvas_remove        (GtkContainer     *container,
  46                                      GtkWidget        *widget);
  47 static void dia_canvas_forall        (GtkContainer     *container,
  48                                      gboolean          include_internals,
  49                                      GtkCallback       callback,
  50                                      gpointer          callback_data);
  51 static GType dia_canvas_child_type   (GtkContainer     *container);
  52
  53 static void dia_canvas_set_child_property (GtkContainer *container,
  54                                           GtkWidget    *child,
  55                                           guint         property_id,
  56                                           const GValue *value,
  57                                           GParamSpec   *pspec);
  58 static void dia_canvas_get_child_property (GtkContainer *container,
  59                                           GtkWidget    *child,
  60                                           guint         property_id,
  61                                           GValue       *value,
  62                                           GParamSpec   *pspec);
  63 static void dia_canvas_send_configure (DiaCanvas     *darea);
  64
  65 static GtkContainerClass *parent_class = NULL;
  66
  67
  68 GType
  69 dia_canvas_get_type (void)
  70 {
  71   static GType canvas_type = 0;
  72
  73   if (!canvas_type)
  74     {
  75       static const GTypeInfo canvas_info =
  76       {
  77         sizeof (DiaCanvasClass),
  78         NULL,           /* base_init */
  79         NULL,           /* base_finalize */
  80         (GClassInitFunc) dia_canvas_class_init,
  81         NULL,           /* class_finalize */
  82         NULL,           /* class_data */
  83         sizeof (DiaCanvas),
  84         0,              /* n_preallocs */
  85         (GInstanceInitFunc) dia_canvas_init,
  86       };
  87
  88       canvas_type = g_type_register_static (GTK_TYPE_CONTAINER, "DiaCanvas",
  89                                            &canvas_info, 0);
  90     }
  91
  92   return canvas_type;
  93 }
  94
  95 static void
  96 dia_canvas_class_init (DiaCanvasClass *class)
  97 {
  98   GtkWidgetClass *widget_class;
  99   GtkContainerClass *container_class;
 100
 101   widget_class = (GtkWidgetClass*) class;
 102   container_class = (GtkContainerClass*) class;
 103
 104   parent_class = g_type_class_peek_parent (class);
 105
 106   widget_class->realize = dia_canvas_realize;
 107   widget_class->size_request = dia_canvas_size_request;
 108   widget_class->size_allocate = dia_canvas_size_allocate;
 109
 110   container_class->add = dia_canvas_add;
 111   container_class->remove = dia_canvas_remove;
 112   container_class->forall = dia_canvas_forall;
 113   container_class->child_type = dia_canvas_child_type;
 114
 115   container_class->set_child_property = dia_canvas_set_child_property;
 116   container_class->get_child_property = dia_canvas_get_child_property;
 117
 118   gtk_container_class_install_child_property (container_class,
 119                                               CHILD_PROP_X,
 120                                               g_param_spec_int ("x",
 121                                                                 _("X position"),
 122                                                                 _("X position of child widget"),
 123                                                                 G_MININT,
 124                                                                 G_MAXINT,
 125                                                                 0,
 126                                                                 G_PARAM_READWRITE));
 127
 128   gtk_container_class_install_child_property (container_class,
 129                                               CHILD_PROP_Y,
 130                                               g_param_spec_int ("y",
 131                                                                 _("Y position"),
 132                                                                 _("Y position of child widget"),
 133                                                                 G_MININT,
 134                                                                 G_MAXINT,
 135                                                                 0,
 136                                                                 G_PARAM_READWRITE));
 137 }
 138
 139 static GType
 140 dia_canvas_child_type (GtkContainer     *container)
 141 {
 142   return GTK_TYPE_WIDGET;
 143 }
 144
 145 static void
 146 dia_canvas_init (DiaCanvas *canvas)
 147 {
 148   canvas->children = NULL;
 149 }
 150
 151 GtkWidget*
 152 dia_canvas_new (void)
 153 {
 154   return g_object_new (DIA_TYPE_CANVAS, NULL);
 155 }
 156
 157 void
 158 dia_canvas_set_size (DiaCanvas *canvas,
 159                      gint      width,
 160                      gint      height)
 161 {
 162   g_return_if_fail (DIA_IS_CANVAS (canvas));
 163
 164   canvas->wantedsize.width = width;
 165   canvas->wantedsize.height = height;
 166
 167   gtk_widget_queue_resize (GTK_WIDGET (canvas));
 168 }
 169
 170 static void
 171 dia_canvas_send_configure (DiaCanvas *darea)
 172 {
 173   GtkWidget *widget;
 174   GdkEvent *event = gdk_event_new (GDK_CONFIGURE);
 175
 176   widget = GTK_WIDGET (darea);
 177
 178   event->configure.window = g_object_ref (widget->window);
 179   event->configure.send_event = TRUE;
 180   event->configure.x = widget->allocation.x;
 181   event->configure.y = widget->allocation.y;
 182   event->configure.width = widget->allocation.width;
 183   event->configure.height = widget->allocation.height;
 184
 185   gtk_widget_event (widget, event);
 186   gdk_event_free (event);
 187 }
 188
 189 static DiaCanvasChild*
 190 get_child (DiaCanvas  *canvas,
 191            GtkWidget *widget)
 192 {
 193   GList *children;
 194
 195   children = canvas->children;
 196   while (children)
 197     {
 198       DiaCanvasChild *child;
 199
 200       child = children->data;
 201       children = children->next;
 202
 203       if (child->widget == widget)
 204         return child;
 205     }
 206
 207   return NULL;
 208 }
 209
 210 void
 211 dia_canvas_put (DiaCanvas       *canvas,
 212                GtkWidget      *widget,
 213                gint            x,
 214                gint            y)
 215 {
 216   DiaCanvasChild *child_info;
 217
 218   g_return_if_fail (DIA_IS_CANVAS (canvas));
 219   g_return_if_fail (GTK_IS_WIDGET (canvas));
 220
 221   child_info = g_new (DiaCanvasChild, 1);
 222   child_info->widget = widget;
 223   child_info->x = x;
 224   child_info->y = y;
 225
 226   gtk_widget_set_parent (widget, GTK_WIDGET (canvas));
 227
 228   canvas->children = g_list_append (canvas->children, child_info);
 229 }
 230
 231 static void
 232 dia_canvas_move_internal (DiaCanvas       *canvas,
 233                          GtkWidget      *widget,
 234                          gboolean        change_x,
 235                          gint            x,
 236                          gboolean        change_y,
 237                          gint            y)
 238 {
 239   DiaCanvasChild *child;
 240
 241   g_return_if_fail (DIA_IS_CANVAS (canvas));
 242   g_return_if_fail (GTK_IS_WIDGET (widget));
 243   g_return_if_fail (widget->parent == GTK_WIDGET (canvas));
 244
 245   child = get_child (canvas, widget);
 246
 247   g_assert (child);
 248
 249   gtk_widget_freeze_child_notify (widget);
 250
 251   if (change_x)
 252     {
 253       child->x = x;
 254       gtk_widget_child_notify (widget, "x");
 255     }
 256
 257   if (change_y)
 258     {
 259       child->y = y;
 260       gtk_widget_child_notify (widget, "y");
 261     }
 262
 263   gtk_widget_thaw_child_notify (widget);
 264
 265   if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (canvas))
 266     gtk_widget_queue_resize (GTK_WIDGET (canvas));
 267 }
 268
 269 void
 270 dia_canvas_move (DiaCanvas       *canvas,
 271                 GtkWidget      *widget,
 272                 gint            x,
 273                 gint            y)
 274 {
 275   dia_canvas_move_internal (canvas, widget, TRUE, x, TRUE, y);
 276 }
 277
 278 static void
 279 dia_canvas_set_child_property (GtkContainer    *container,
 280                               GtkWidget       *child,
 281                               guint            property_id,
 282                               const GValue    *value,
 283                               GParamSpec      *pspec)
 284 {
 285   switch (property_id)
 286     {
 287     case CHILD_PROP_X:
 288       dia_canvas_move_internal (DIA_CANVAS (container),
 289                                child,
 290                                TRUE, g_value_get_int (value),
 291                                FALSE, 0);
 292       break;
 293     case CHILD_PROP_Y:
 294       dia_canvas_move_internal (DIA_CANVAS (container),
 295                                child,
 296                                FALSE, 0,
 297                                TRUE, g_value_get_int (value));
 298       break;
 299     default:
 300       GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
 301       break;
 302     }
 303 }
 304
 305 static void
 306 dia_canvas_get_child_property (GtkContainer *container,
 307                               GtkWidget    *child,
 308                               guint         property_id,
 309                               GValue       *value,
 310                               GParamSpec   *pspec)
 311 {
 312   DiaCanvasChild *canvas_child;
 313
 314   canvas_child = get_child (DIA_CANVAS (container), child);
 315
 316   switch (property_id)
 317     {
 318     case CHILD_PROP_X:
 319       g_value_set_int (value, canvas_child->x);
 320       break;
 321     case CHILD_PROP_Y:
 322       g_value_set_int (value, canvas_child->y);
 323       break;
 324     default:
 325       GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
 326       break;
 327     }
 328 }
 329
 330 static void
 331 dia_canvas_realize (GtkWidget *widget)
 332 {
 333   GdkWindowAttr attributes;
 334   gint attributes_mask;
 335
 336   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 337
 338   attributes.window_type = GDK_WINDOW_CHILD;
 339   attributes.x = widget->allocation.x;
 340   attributes.y = widget->allocation.y;
 341   attributes.width = widget->allocation.width;
 342   attributes.height = widget->allocation.height;
 343   attributes.wclass = GDK_INPUT_OUTPUT;
 344   attributes.visual = gtk_widget_get_visual (widget);
 345   attributes.colormap = gtk_widget_get_colormap (widget);
 346   attributes.event_mask = gtk_widget_get_events (widget);
 347   attributes.event_mask |= GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK;
 348
 349   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 350
 351   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes,
 352                                    attributes_mask);
 353   gdk_window_set_user_data (widget->window, widget);
 354
 355   widget->style = gtk_style_attach (widget->style, widget->window);
 356   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 357
 358   dia_canvas_send_configure (DIA_CANVAS (widget));
 359 }
 360
 361 static void
 362 dia_canvas_size_request (GtkWidget      *widget,
 363                         GtkRequisition *requisition)
 364 {
 365   DiaCanvas *canvas;
 366   DiaCanvasChild *child;
 367   GList *children;
 368   GtkRequisition child_requisition;
 369
 370   canvas = DIA_CANVAS (widget);
 371
 372   requisition->width = canvas->wantedsize.width;
 373   requisition->height = canvas->wantedsize.height;
 374
 375
 376   children = canvas->children;
 377   while (children)
 378     {
 379       child = children->data;
 380       children = children->next;
 381
 382       if (GTK_WIDGET_VISIBLE (child->widget))
 383         {
 384           gtk_widget_size_request (child->widget, &child_requisition);
 385
 386           requisition->height = MAX (requisition->height,
 387                                      child->y +
 388                                      child_requisition.height);
 389           requisition->width = MAX (requisition->width,
 390                                     child->x +
 391                                     child_requisition.width);
 392         }
 393     }
 394   /*
 395   requisition->height += GTK_CONTAINER (canvas)->border_width * 2;
 396   requisition->width += GTK_CONTAINER (canvas)->border_width * 2;
 397   */
 398 }
 399
 400 static void
 401 dia_canvas_size_allocate (GtkWidget     *widget,
 402                          GtkAllocation *allocation)
 403 {
 404   DiaCanvas *canvas;
 405   DiaCanvasChild *child;
 406   GtkAllocation child_allocation;
 407   GtkRequisition child_requisition;
 408   GList *children;
 409   guint16 border_width;
 410
 411   canvas = DIA_CANVAS (widget);
 412
 413   widget->allocation = *allocation;
 414
 415   if (GTK_WIDGET_REALIZED (widget)) {
 416     gdk_window_move_resize (widget->window,
 417                             allocation->x,
 418                             allocation->y,
 419                             allocation->width,
 420                             allocation->height);
 421     dia_canvas_send_configure (DIA_CANVAS (widget));
 422   }
 423   border_width = GTK_CONTAINER (canvas)->border_width;
 424
 425   children = canvas->children;
 426   while (children)
 427     {
 428       child = children->data;
 429       children = children->next;
 430
 431       if (GTK_WIDGET_VISIBLE (child->widget))
 432         {
 433           gtk_widget_get_child_requisition (child->widget, &child_requisition);
 434           child_allocation.x = child->x + border_width;
 435           child_allocation.y = child->y + border_width;
 436
 437           if (GTK_WIDGET_NO_WINDOW (widget))
 438             {
 439               child_allocation.x += widget->allocation.x;
 440               child_allocation.y += widget->allocation.y;
 441             }
 442
 443           child_allocation.width = child_requisition.width;
 444           child_allocation.height = child_requisition.height;
 445           gtk_widget_size_allocate (child->widget, &child_allocation);
 446         }
 447     }
 448 }
 449
 450 static void
 451 dia_canvas_add (GtkContainer *container,
 452                GtkWidget    *widget)
 453 {
 454   dia_canvas_put (DIA_CANVAS (container), widget, 0, 0);
 455 }
 456
 457 static void
 458 dia_canvas_remove (GtkContainer *container,
 459                   GtkWidget    *widget)
 460 {
 461   DiaCanvas *canvas;
 462   DiaCanvasChild *child;
 463   GList *children;
 464
 465   canvas = DIA_CANVAS (container);
 466
 467   children = canvas->children;
 468   while (children)
 469     {
 470       child = children->data;
 471
 472       if (child->widget == widget)
 473         {
 474           gboolean was_visible = GTK_WIDGET_VISIBLE (widget);
 475
 476           gtk_widget_unparent (widget);
 477
 478           canvas->children = g_list_remove_link (canvas->children, children);
 479           g_list_free (children);
 480           g_free (child);
 481
 482           if (was_visible && GTK_WIDGET_VISIBLE (container))
 483             gtk_widget_queue_resize (GTK_WIDGET (container));
 484
 485           break;
 486         }
 487
 488       children = children->next;
 489     }
 490 }
 491
 492 static void
 493 dia_canvas_forall (GtkContainer *container,
 494                   gboolean      include_internals,
 495                   GtkCallback   callback,
 496                   gpointer      callback_data)
 497 {
 498   DiaCanvas *canvas;
 499   DiaCanvasChild *child;
 500   GList *children;
 501
 502   g_return_if_fail (callback != NULL);
 503
 504   canvas = DIA_CANVAS (container);
 505
 506   children = canvas->children;
 507   while (children)
 508     {
 509       child = children->data;
 510       children = children->next;
 511
 512       (* callback) (child->widget, callback_data);
 513     }
 514 }
 515