Pileus Git - ~andy/gtk/blob - gtk/gtkscrolledwindow.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 Library 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  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library 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 #include "gtkscrolledwindow.h"
  20 #include "gtksignal.h"
  21
  22
  23 #define SCROLLBAR_SPACING(w) (GTK_SCROLLED_WINDOW_CLASS (GTK_OBJECT (w)->klass)->scrollbar_spacing)
  24
  25 enum {
  26   ARG_0,
  27   ARG_VIEWPORT,
  28   ARG_HSCROLLBAR_POLICY,
  29   ARG_VSCROLLBAR_POLICY
  30 };
  31
  32
  33 static void gtk_scrolled_window_class_init         (GtkScrolledWindowClass *klass);
  34 static void gtk_scrolled_window_init               (GtkScrolledWindow      *scrolled_window);
  35 static void gtk_scrolled_window_set_arg            (GtkObject              *object,
  36                                                     GtkArg                 *arg,
  37                                                     guint                   arg_id);
  38 static void gtk_scrolled_window_get_arg            (GtkObject              *object,
  39                                                     GtkArg                 *arg,
  40                                                     guint                   arg_id);
  41 static void gtk_scrolled_window_destroy            (GtkObject              *object);
  42 static void gtk_scrolled_window_finalize           (GtkObject              *object);
  43 static void gtk_scrolled_window_map                (GtkWidget              *widget);
  44 static void gtk_scrolled_window_unmap              (GtkWidget              *widget);
  45 static void gtk_scrolled_window_draw               (GtkWidget              *widget,
  46                                                     GdkRectangle           *area);
  47 static void gtk_scrolled_window_size_request       (GtkWidget              *widget,
  48                                                     GtkRequisition         *requisition);
  49 static void gtk_scrolled_window_size_allocate      (GtkWidget              *widget,
  50                                                     GtkAllocation          *allocation);
  51 static void gtk_scrolled_window_add                (GtkContainer           *container,
  52                                                     GtkWidget              *widget);
  53 static void gtk_scrolled_window_remove             (GtkContainer           *container,
  54                                                     GtkWidget              *widget);
  55 static void gtk_scrolled_window_foreach            (GtkContainer           *container,
  56                                                     GtkCallback             callback,
  57                                                     gpointer                callback_data);
  58 static void gtk_scrolled_window_viewport_allocate  (GtkWidget              *widget,
  59                                                     GtkAllocation          *allocation);
  60 static void gtk_scrolled_window_adjustment_changed (GtkAdjustment          *adjustment,
  61                                                     gpointer                data);
  62
  63
  64 static GtkContainerClass *parent_class = NULL;
  65
  66
  67 GtkType
  68 gtk_scrolled_window_get_type (void)
  69 {
  70   static GtkType scrolled_window_type = 0;
  71
  72   if (!scrolled_window_type)
  73     {
  74       GtkTypeInfo scrolled_window_info =
  75       {
  76         "GtkScrolledWindow",
  77         sizeof (GtkScrolledWindow),
  78         sizeof (GtkScrolledWindowClass),
  79         (GtkClassInitFunc) gtk_scrolled_window_class_init,
  80         (GtkObjectInitFunc) gtk_scrolled_window_init,
  81         /* reserved_1 */ NULL,
  82         /* reserved_2 */ NULL,
  83         (GtkClassInitFunc) NULL,
  84       };
  85
  86       scrolled_window_type = gtk_type_unique (GTK_TYPE_CONTAINER, &scrolled_window_info);
  87     }
  88
  89   return scrolled_window_type;
  90 }
  91
  92 static void
  93 gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
  94 {
  95   GtkObjectClass *object_class;
  96   GtkWidgetClass *widget_class;
  97   GtkContainerClass *container_class;
  98
  99   object_class = (GtkObjectClass*) class;
 100   widget_class = (GtkWidgetClass*) class;
 101   container_class = (GtkContainerClass*) class;
 102   parent_class = gtk_type_class (GTK_TYPE_CONTAINER);
 103
 104   gtk_object_add_arg_type ("GtkScrolledWindow::viewport",
 105                            GTK_TYPE_VIEWPORT,
 106                            GTK_ARG_READWRITE | GTK_ARG_CONSTRUCT,
 107                            ARG_VIEWPORT);
 108   gtk_object_add_arg_type ("GtkScrolledWindow::hscrollbar_policy",
 109                            GTK_TYPE_POLICY_TYPE,
 110                            GTK_ARG_READWRITE,
 111                            ARG_HSCROLLBAR_POLICY);
 112   gtk_object_add_arg_type ("GtkScrolledWindow::vscrollbar_policy",
 113                            GTK_TYPE_POLICY_TYPE,
 114                            GTK_ARG_READWRITE,
 115                            ARG_VSCROLLBAR_POLICY);
 116
 117   object_class->set_arg = gtk_scrolled_window_set_arg;
 118   object_class->get_arg = gtk_scrolled_window_get_arg;
 119   object_class->destroy = gtk_scrolled_window_destroy;
 120   object_class->finalize = gtk_scrolled_window_finalize;
 121
 122   widget_class->map = gtk_scrolled_window_map;
 123   widget_class->unmap = gtk_scrolled_window_unmap;
 124   widget_class->draw = gtk_scrolled_window_draw;
 125   widget_class->size_request = gtk_scrolled_window_size_request;
 126   widget_class->size_allocate = gtk_scrolled_window_size_allocate;
 127
 128   container_class->add = gtk_scrolled_window_add;
 129   container_class->remove = gtk_scrolled_window_remove;
 130   container_class->foreach = gtk_scrolled_window_foreach;
 131
 132   class->scrollbar_spacing = 5;
 133 }
 134
 135 static void
 136 gtk_scrolled_window_set_arg (GtkObject        *object,
 137                              GtkArg           *arg,
 138                              guint             arg_id)
 139 {
 140   GtkScrolledWindow *scrolled_window;
 141
 142   scrolled_window = GTK_SCROLLED_WINDOW (object);
 143
 144   switch (arg_id)
 145     {
 146       GtkWidget *viewport;
 147
 148     case ARG_VIEWPORT:
 149       g_return_if_fail (scrolled_window->viewport == NULL);
 150       viewport = GTK_VALUE_POINTER (*arg);
 151       if (!viewport)
 152         viewport = gtk_viewport_new (NULL, NULL);
 153       scrolled_window->viewport = viewport;
 154       gtk_scrolled_window_construct (scrolled_window, NULL, NULL);
 155     case ARG_HSCROLLBAR_POLICY:
 156       gtk_scrolled_window_set_policy (scrolled_window,
 157                                       GTK_VALUE_ENUM (*arg),
 158                                       scrolled_window->vscrollbar_policy);
 159       break;
 160     case ARG_VSCROLLBAR_POLICY:
 161       gtk_scrolled_window_set_policy (scrolled_window,
 162                                       scrolled_window->hscrollbar_policy,
 163                                       GTK_VALUE_ENUM (*arg));
 164       break;
 165     default:
 166       break;
 167     }
 168 }
 169
 170 static void
 171 gtk_scrolled_window_get_arg (GtkObject        *object,
 172                              GtkArg           *arg,
 173                              guint             arg_id)
 174 {
 175   GtkScrolledWindow *scrolled_window;
 176
 177   scrolled_window = GTK_SCROLLED_WINDOW (object);
 178
 179   switch (arg_id)
 180     {
 181     case ARG_VIEWPORT:
 182       GTK_VALUE_POINTER (*arg) = scrolled_window->viewport;
 183       break;
 184     case ARG_HSCROLLBAR_POLICY:
 185       GTK_VALUE_ENUM (*arg) = scrolled_window->hscrollbar_policy;
 186       break;
 187     case ARG_VSCROLLBAR_POLICY:
 188       GTK_VALUE_ENUM (*arg) = scrolled_window->vscrollbar_policy;
 189       break;
 190     default:
 191       arg->type = GTK_TYPE_INVALID;
 192       break;
 193     }
 194 }
 195
 196 static void
 197 gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
 198 {
 199   GTK_WIDGET_SET_FLAGS (scrolled_window, GTK_NO_WINDOW);
 200
 201   gtk_container_set_resize_mode (GTK_CONTAINER (scrolled_window), GTK_RESIZE_QUEUE);
 202
 203   scrolled_window->hscrollbar = NULL;
 204   scrolled_window->vscrollbar = NULL;
 205   scrolled_window->hscrollbar_policy = GTK_POLICY_ALWAYS;
 206   scrolled_window->vscrollbar_policy = GTK_POLICY_ALWAYS;
 207 }
 208
 209 GtkWidget*
 210 gtk_scrolled_window_new (GtkAdjustment *hadjustment,
 211                          GtkAdjustment *vadjustment)
 212 {
 213   GtkWidget *scrolled_window;
 214
 215   scrolled_window = gtk_type_new (GTK_TYPE_SCROLLED_WINDOW);
 216
 217   gtk_scrolled_window_construct (GTK_SCROLLED_WINDOW (scrolled_window), hadjustment, vadjustment);
 218
 219   return scrolled_window;
 220 }
 221
 222 void
 223 gtk_scrolled_window_construct (GtkScrolledWindow *scrolled_window,
 224                                GtkAdjustment     *hadjustment,
 225                                GtkAdjustment     *vadjustment)
 226 {
 227   g_return_if_fail (scrolled_window != NULL);
 228   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 229   g_return_if_fail (scrolled_window->hscrollbar == NULL);
 230   g_return_if_fail (scrolled_window->vscrollbar == NULL);
 231
 232   if (scrolled_window->viewport)
 233     g_return_if_fail (hadjustment == NULL && vadjustment == NULL);
 234   else
 235     scrolled_window->viewport = gtk_viewport_new (hadjustment, vadjustment);
 236
 237   hadjustment = gtk_viewport_get_hadjustment (GTK_VIEWPORT (scrolled_window->viewport));
 238   vadjustment = gtk_viewport_get_vadjustment (GTK_VIEWPORT (scrolled_window->viewport));
 239   gtk_container_set_resize_mode (GTK_CONTAINER (scrolled_window->viewport), GTK_RESIZE_PARENT);
 240
 241   gtk_signal_connect (GTK_OBJECT (hadjustment), "changed",
 242                       (GtkSignalFunc) gtk_scrolled_window_adjustment_changed,
 243                       (gpointer) scrolled_window);
 244   gtk_signal_connect (GTK_OBJECT (vadjustment), "changed",
 245                       (GtkSignalFunc) gtk_scrolled_window_adjustment_changed,
 246                       (gpointer) scrolled_window);
 247
 248   scrolled_window->hscrollbar = gtk_hscrollbar_new (hadjustment);
 249   scrolled_window->vscrollbar = gtk_vscrollbar_new (vadjustment);
 250
 251   gtk_widget_set_parent (scrolled_window->viewport, GTK_WIDGET (scrolled_window));
 252   gtk_widget_set_parent (scrolled_window->hscrollbar, GTK_WIDGET (scrolled_window));
 253   gtk_widget_set_parent (scrolled_window->vscrollbar, GTK_WIDGET (scrolled_window));
 254
 255   gtk_widget_show (scrolled_window->viewport);
 256   gtk_widget_show (scrolled_window->hscrollbar);
 257   gtk_widget_show (scrolled_window->vscrollbar);
 258
 259   gtk_widget_ref (scrolled_window->viewport);
 260   gtk_widget_ref (scrolled_window->hscrollbar);
 261   gtk_widget_ref (scrolled_window->vscrollbar);
 262 }
 263
 264 GtkAdjustment*
 265 gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
 266 {
 267   g_return_val_if_fail (scrolled_window != NULL, NULL);
 268   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 269
 270   return gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 271 }
 272
 273 GtkAdjustment*
 274 gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
 275 {
 276   g_return_val_if_fail (scrolled_window != NULL, NULL);
 277   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 278
 279   return gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 280 }
 281
 282 void
 283 gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
 284                                 GtkPolicyType      hscrollbar_policy,
 285                                 GtkPolicyType      vscrollbar_policy)
 286 {
 287   g_return_if_fail (scrolled_window != NULL);
 288   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 289
 290   if ((scrolled_window->hscrollbar_policy != hscrollbar_policy) ||
 291       (scrolled_window->vscrollbar_policy != vscrollbar_policy))
 292     {
 293       scrolled_window->hscrollbar_policy = hscrollbar_policy;
 294       scrolled_window->vscrollbar_policy = vscrollbar_policy;
 295
 296       if (GTK_WIDGET (scrolled_window)->parent)
 297         gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 298     }
 299 }
 300
 301
 302 static void
 303 gtk_scrolled_window_destroy (GtkObject *object)
 304 {
 305   GtkScrolledWindow *scrolled_window;
 306
 307   g_return_if_fail (object != NULL);
 308   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (object));
 309
 310   scrolled_window = GTK_SCROLLED_WINDOW (object);
 311
 312   gtk_widget_destroy (scrolled_window->viewport);
 313   gtk_widget_destroy (scrolled_window->hscrollbar);
 314   gtk_widget_destroy (scrolled_window->vscrollbar);
 315
 316   if (GTK_OBJECT_CLASS (parent_class)->destroy)
 317     (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
 318 }
 319
 320 static void
 321 gtk_scrolled_window_finalize (GtkObject *object)
 322 {
 323   GtkScrolledWindow *scrolled_window;
 324
 325   scrolled_window = GTK_SCROLLED_WINDOW (object);
 326   gtk_widget_unref (scrolled_window->viewport);
 327   gtk_widget_unref (scrolled_window->hscrollbar);
 328   gtk_widget_unref (scrolled_window->vscrollbar);
 329
 330   GTK_OBJECT_CLASS (parent_class)->finalize (object);
 331 }
 332
 333 static void
 334 gtk_scrolled_window_map (GtkWidget *widget)
 335 {
 336   GtkScrolledWindow *scrolled_window;
 337
 338   g_return_if_fail (widget != NULL);
 339   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
 340
 341   if (!GTK_WIDGET_MAPPED (widget))
 342     {
 343       GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 344       scrolled_window = GTK_SCROLLED_WINDOW (widget);
 345
 346       if (GTK_WIDGET_VISIBLE (scrolled_window->viewport) &&
 347           !GTK_WIDGET_MAPPED (scrolled_window->viewport))
 348         gtk_widget_map (scrolled_window->viewport);
 349
 350       if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar) &&
 351           !GTK_WIDGET_MAPPED (scrolled_window->hscrollbar))
 352         gtk_widget_map (scrolled_window->hscrollbar);
 353
 354       if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar) &&
 355           !GTK_WIDGET_MAPPED (scrolled_window->vscrollbar))
 356         gtk_widget_map (scrolled_window->vscrollbar);
 357     }
 358 }
 359
 360 static void
 361 gtk_scrolled_window_unmap (GtkWidget *widget)
 362 {
 363   GtkScrolledWindow *scrolled_window;
 364
 365   g_return_if_fail (widget != NULL);
 366   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
 367
 368   if (GTK_WIDGET_MAPPED (widget))
 369     {
 370       GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);
 371       scrolled_window = GTK_SCROLLED_WINDOW (widget);
 372
 373       if (GTK_WIDGET_MAPPED (scrolled_window->viewport))
 374         gtk_widget_unmap (scrolled_window->viewport);
 375
 376       if (GTK_WIDGET_MAPPED (scrolled_window->hscrollbar))
 377         gtk_widget_unmap (scrolled_window->hscrollbar);
 378
 379       if (GTK_WIDGET_MAPPED (scrolled_window->vscrollbar))
 380         gtk_widget_unmap (scrolled_window->vscrollbar);
 381     }
 382 }
 383
 384 static void
 385 gtk_scrolled_window_draw (GtkWidget    *widget,
 386                           GdkRectangle *area)
 387 {
 388   GtkScrolledWindow *scrolled_window;
 389   GdkRectangle child_area;
 390
 391   g_return_if_fail (widget != NULL);
 392   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
 393   g_return_if_fail (area != NULL);
 394
 395   if (GTK_WIDGET_DRAWABLE (widget))
 396     {
 397       scrolled_window = GTK_SCROLLED_WINDOW (widget);
 398
 399       if (gtk_widget_intersect (scrolled_window->viewport, area, &child_area))
 400         gtk_widget_draw (scrolled_window->viewport, &child_area);
 401
 402       if (gtk_widget_intersect (scrolled_window->hscrollbar, area, &child_area))
 403         gtk_widget_draw (scrolled_window->hscrollbar, &child_area);
 404
 405       if (gtk_widget_intersect (scrolled_window->vscrollbar, area, &child_area))
 406         gtk_widget_draw (scrolled_window->vscrollbar, &child_area);
 407     }
 408 }
 409
 410 static void
 411 gtk_scrolled_window_size_request (GtkWidget      *widget,
 412                                   GtkRequisition *requisition)
 413 {
 414   GtkScrolledWindow *scrolled_window;
 415   gint extra_height;
 416   gint extra_width;
 417
 418   g_return_if_fail (widget != NULL);
 419   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
 420   g_return_if_fail (requisition != NULL);
 421
 422   scrolled_window = GTK_SCROLLED_WINDOW (widget);
 423
 424   requisition->width = 0;
 425   requisition->height = 0;
 426
 427   if (GTK_WIDGET_VISIBLE (scrolled_window->viewport))
 428     {
 429       gtk_widget_size_request (scrolled_window->viewport, &scrolled_window->viewport->requisition);
 430
 431       requisition->width += scrolled_window->viewport->requisition.width;
 432       requisition->height += scrolled_window->viewport->requisition.height;
 433     }
 434
 435   extra_width = 0;
 436   extra_height = 0;
 437
 438   if ((scrolled_window->hscrollbar_policy == GTK_POLICY_AUTOMATIC) ||
 439       GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
 440     {
 441       gtk_widget_size_request (scrolled_window->hscrollbar,
 442                                &scrolled_window->hscrollbar->requisition);
 443
 444       requisition->width = MAX (requisition->width, scrolled_window->hscrollbar->requisition.width);
 445       extra_height = SCROLLBAR_SPACING (scrolled_window) + scrolled_window->hscrollbar->requisition.height;
 446     }
 447
 448   if ((scrolled_window->vscrollbar_policy == GTK_POLICY_AUTOMATIC) ||
 449       GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
 450     {
 451       gtk_widget_size_request (scrolled_window->vscrollbar,
 452                                &scrolled_window->vscrollbar->requisition);
 453
 454       requisition->height = MAX (requisition->height, scrolled_window->vscrollbar->requisition.height);
 455       extra_width = SCROLLBAR_SPACING (scrolled_window) + scrolled_window->vscrollbar->requisition.width;
 456     }
 457
 458   requisition->width += GTK_CONTAINER (widget)->border_width * 2 + extra_width;
 459   requisition->height += GTK_CONTAINER (widget)->border_width * 2 + extra_height;
 460 }
 461
 462 static void
 463 gtk_scrolled_window_size_allocate (GtkWidget     *widget,
 464                                    GtkAllocation *allocation)
 465 {
 466   GtkScrolledWindow *scrolled_window;
 467   GtkAllocation viewport_allocation;
 468   GtkAllocation child_allocation;
 469   guint previous_hvis;
 470   guint previous_vvis;
 471   gint count;
 472
 473   g_return_if_fail (widget != NULL);
 474   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
 475   g_return_if_fail (allocation != NULL);
 476
 477   scrolled_window = GTK_SCROLLED_WINDOW (widget);
 478   widget->allocation = *allocation;
 479
 480   if (scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
 481     scrolled_window->hscrollbar_visible = TRUE;
 482   if (scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
 483     scrolled_window->vscrollbar_visible = TRUE;
 484
 485   if (GTK_WIDGET_VISIBLE (scrolled_window->viewport))
 486     {
 487       count = 0;
 488
 489       do {
 490         gtk_scrolled_window_viewport_allocate (widget, &viewport_allocation);
 491
 492         child_allocation.x = viewport_allocation.x + allocation->x;
 493         child_allocation.y = viewport_allocation.y + allocation->y;
 494         child_allocation.width = viewport_allocation.width;
 495         child_allocation.height = viewport_allocation.height;
 496
 497         previous_hvis = scrolled_window->hscrollbar_visible;
 498         previous_vvis = scrolled_window->vscrollbar_visible;
 499
 500         gtk_widget_size_allocate (scrolled_window->viewport, &child_allocation);
 501         /* If, after the first iteration, the hscrollbar and the
 502          * vscrollbar flip visiblity, then we need both.
 503          */
 504         if ((count++) &&
 505             (previous_hvis != scrolled_window->hscrollbar_visible) &&
 506             (previous_vvis != scrolled_window->vscrollbar_visible))
 507           {
 508             scrolled_window->hscrollbar_visible = TRUE;
 509             scrolled_window->vscrollbar_visible = TRUE;
 510             break;
 511           }
 512
 513         count++;
 514       } while ((previous_hvis != scrolled_window->hscrollbar_visible) ||
 515                (previous_vvis != scrolled_window->vscrollbar_visible));
 516     }
 517
 518   if (scrolled_window->hscrollbar_visible)
 519     {
 520       if (!GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
 521         gtk_widget_show (scrolled_window->hscrollbar);
 522
 523       child_allocation.x = viewport_allocation.x;
 524       child_allocation.y = viewport_allocation.y + viewport_allocation.height + SCROLLBAR_SPACING (scrolled_window);
 525       child_allocation.width = viewport_allocation.width;
 526       child_allocation.height = scrolled_window->hscrollbar->requisition.height;
 527       child_allocation.x += allocation->x;
 528       child_allocation.y += allocation->y;
 529
 530       gtk_widget_size_allocate (scrolled_window->hscrollbar, &child_allocation);
 531     }
 532   else
 533     {
 534       if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
 535         gtk_widget_hide (scrolled_window->hscrollbar);
 536     }
 537
 538   if (scrolled_window->vscrollbar_visible)
 539     {
 540       if (!GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
 541         gtk_widget_show (scrolled_window->vscrollbar);
 542
 543       child_allocation.x = viewport_allocation.x + viewport_allocation.width + SCROLLBAR_SPACING (scrolled_window);
 544       child_allocation.y = viewport_allocation.y;
 545       child_allocation.width = scrolled_window->vscrollbar->requisition.width;
 546       child_allocation.height = viewport_allocation.height;
 547       child_allocation.x += allocation->x;
 548       child_allocation.y += allocation->y;
 549
 550       gtk_widget_size_allocate (scrolled_window->vscrollbar, &child_allocation);
 551     }
 552   else
 553     {
 554       if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
 555         gtk_widget_hide (scrolled_window->vscrollbar);
 556     }
 557 }
 558
 559 static void
 560 gtk_scrolled_window_add (GtkContainer *container,
 561                          GtkWidget    *widget)
 562 {
 563   GtkScrolledWindow *scrolled_window;
 564
 565   g_return_if_fail (container != NULL);
 566   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
 567   g_return_if_fail (widget != NULL);
 568
 569   scrolled_window = GTK_SCROLLED_WINDOW (container);
 570   gtk_container_add (GTK_CONTAINER (scrolled_window->viewport), widget);
 571 }
 572
 573 static void
 574 gtk_scrolled_window_remove (GtkContainer *container,
 575                             GtkWidget    *widget)
 576 {
 577   GtkScrolledWindow *scrolled_window;
 578
 579   g_return_if_fail (container != NULL);
 580   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
 581   g_return_if_fail (widget != NULL);
 582
 583   scrolled_window = GTK_SCROLLED_WINDOW (container);
 584
 585   if (scrolled_window->viewport == widget ||
 586       scrolled_window->hscrollbar == widget ||
 587       scrolled_window->vscrollbar == widget)
 588     {
 589       /* this happens during destroy */
 590       gtk_widget_unparent (widget);
 591     }
 592   else
 593     gtk_container_remove (GTK_CONTAINER (scrolled_window->viewport), widget);
 594 }
 595
 596 static void
 597 gtk_scrolled_window_foreach (GtkContainer *container,
 598                              GtkCallback   callback,
 599                              gpointer      callback_data)
 600 {
 601   GtkScrolledWindow *scrolled_window;
 602
 603   g_return_if_fail (container != NULL);
 604   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
 605   g_return_if_fail (callback != NULL);
 606
 607   scrolled_window = GTK_SCROLLED_WINDOW (container);
 608
 609   if (scrolled_window->viewport)
 610     (* callback) (scrolled_window->viewport, callback_data);
 611
 612   (* callback) (scrolled_window->vscrollbar, callback_data);
 613   (* callback) (scrolled_window->hscrollbar, callback_data);
 614 }
 615
 616 static void
 617 gtk_scrolled_window_viewport_allocate (GtkWidget     *widget,
 618                                        GtkAllocation *allocation)
 619 {
 620   GtkScrolledWindow *scrolled_window;
 621
 622   g_return_if_fail (widget != NULL);
 623   g_return_if_fail (allocation != NULL);
 624
 625   scrolled_window = GTK_SCROLLED_WINDOW (widget);
 626
 627   allocation->x = GTK_CONTAINER (widget)->border_width;
 628   allocation->y = GTK_CONTAINER (widget)->border_width;
 629   allocation->width = MAX (1, widget->allocation.width - allocation->x * 2);
 630   allocation->height = MAX (1, widget->allocation.height - allocation->y * 2);
 631
 632   if (scrolled_window->vscrollbar_visible)
 633     allocation->width = MAX (1,
 634       allocation->width - (scrolled_window->vscrollbar->requisition.width + SCROLLBAR_SPACING (scrolled_window)));
 635   if (scrolled_window->hscrollbar_visible)
 636     allocation->height = MAX (1,
 637       allocation->height - (scrolled_window->hscrollbar->requisition.height + SCROLLBAR_SPACING (scrolled_window)));
 638 }
 639
 640 static void
 641 gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
 642                                         gpointer       data)
 643 {
 644   GtkScrolledWindow *scrolled_win;
 645
 646   g_return_if_fail (adjustment != NULL);
 647   g_return_if_fail (data != NULL);
 648
 649   scrolled_win = GTK_SCROLLED_WINDOW (data);
 650
 651   if (adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->hscrollbar)))
 652     {
 653       if (scrolled_win->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
 654         {
 655           scrolled_win->hscrollbar_visible =
 656             ((adjustment->upper - adjustment->lower) > adjustment->page_size);
 657         }
 658     }
 659   else if (adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->vscrollbar)))
 660     {
 661       if (scrolled_win->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
 662         {
 663           scrolled_win->vscrollbar_visible =
 664             ((adjustment->upper - adjustment->lower) > adjustment->page_size);
 665         }
 666     }
 667   else
 668     {
 669       g_warning ("could not determine which adjustment scrollbar received change signal for");
 670       return;
 671     }
 672 }