Pileus Git - ~andy/gtk/blob - gtk/gtkviewport.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 "gtksignal.h"
  20 #include "gtkviewport.h"
  21
  22 enum {
  23   ARG_0,
  24   ARG_HADJUSTMENT,
  25   ARG_VADJUSTMENT,
  26   ARG_SHADOW_TYPE
  27 };
  28
  29
  30
  31 static void gtk_viewport_class_init               (GtkViewportClass *klass);
  32 static void gtk_viewport_init                     (GtkViewport      *viewport);
  33 static void gtk_viewport_finalize                 (GtkObject        *object);
  34 static void gtk_viewport_set_arg                  (GtkObject        *object,
  35                                                    GtkArg           *arg,
  36                                                    guint             arg_id);
  37 static void gtk_viewport_get_arg                  (GtkObject        *object,
  38                                                    GtkArg           *arg,
  39                                                    guint             arg_id);
  40 static void gtk_viewport_map                      (GtkWidget        *widget);
  41 static void gtk_viewport_unmap                    (GtkWidget        *widget);
  42 static void gtk_viewport_realize                  (GtkWidget        *widget);
  43 static void gtk_viewport_unrealize                (GtkWidget        *widget);
  44 static void gtk_viewport_paint                    (GtkWidget        *widget,
  45                                                    GdkRectangle     *area);
  46 static void gtk_viewport_draw                     (GtkWidget        *widget,
  47                                                    GdkRectangle     *area);
  48 static gint gtk_viewport_expose                   (GtkWidget        *widget,
  49                                                    GdkEventExpose   *event);
  50 static void gtk_viewport_add                      (GtkContainer     *container,
  51                                                    GtkWidget        *widget);
  52 static void gtk_viewport_size_request             (GtkWidget        *widget,
  53                                                    GtkRequisition   *requisition);
  54 static void gtk_viewport_size_allocate            (GtkWidget        *widget,
  55                                                    GtkAllocation    *allocation);
  56 static void gtk_viewport_adjustment_changed       (GtkAdjustment    *adjustment,
  57                                                    gpointer          data);
  58 static void gtk_viewport_adjustment_value_changed (GtkAdjustment    *adjustment,
  59                                                    gpointer          data);
  60
  61 static GtkBinClass *parent_class;
  62
  63 GtkType
  64 gtk_viewport_get_type (void)
  65 {
  66   static GtkType viewport_type = 0;
  67
  68   if (!viewport_type)
  69     {
  70       GtkTypeInfo viewport_info =
  71       {
  72         "GtkViewport",
  73         sizeof (GtkViewport),
  74         sizeof (GtkViewportClass),
  75         (GtkClassInitFunc) gtk_viewport_class_init,
  76         (GtkObjectInitFunc) gtk_viewport_init,
  77         /* reserved_1 */ NULL,
  78         /* reserved_2 */ NULL,
  79         (GtkClassInitFunc) NULL,
  80       };
  81
  82       viewport_type = gtk_type_unique (GTK_TYPE_BIN, &viewport_info);
  83     }
  84
  85   return viewport_type;
  86 }
  87
  88 static void
  89 gtk_viewport_class_init (GtkViewportClass *class)
  90 {
  91   GtkObjectClass *object_class;
  92   GtkWidgetClass *widget_class;
  93   GtkContainerClass *container_class;
  94
  95   object_class = (GtkObjectClass*) class;
  96   widget_class = (GtkWidgetClass*) class;
  97   container_class = (GtkContainerClass*) class;
  98   parent_class = (GtkBinClass*) gtk_type_class (GTK_TYPE_BIN);
  99
 100   gtk_object_add_arg_type ("GtkViewport::hadjustment",
 101                            GTK_TYPE_ADJUSTMENT,
 102                            GTK_ARG_READWRITE | GTK_ARG_CONSTRUCT,
 103                            ARG_HADJUSTMENT);
 104   gtk_object_add_arg_type ("GtkViewport::vadjustment",
 105                            GTK_TYPE_ADJUSTMENT,
 106                            GTK_ARG_READWRITE | GTK_ARG_CONSTRUCT,
 107                            ARG_VADJUSTMENT);
 108   gtk_object_add_arg_type ("GtkViewport::shadow_type",
 109                            GTK_TYPE_SHADOW_TYPE,
 110                            GTK_ARG_READWRITE,
 111                            ARG_SHADOW_TYPE);
 112
 113   object_class->set_arg = gtk_viewport_set_arg;
 114   object_class->get_arg = gtk_viewport_get_arg;
 115   object_class->finalize = gtk_viewport_finalize;
 116
 117   widget_class->map = gtk_viewport_map;
 118   widget_class->unmap = gtk_viewport_unmap;
 119   widget_class->realize = gtk_viewport_realize;
 120   widget_class->unrealize = gtk_viewport_unrealize;
 121   widget_class->draw = gtk_viewport_draw;
 122   widget_class->expose_event = gtk_viewport_expose;
 123   widget_class->size_request = gtk_viewport_size_request;
 124   widget_class->size_allocate = gtk_viewport_size_allocate;
 125
 126   container_class->add = gtk_viewport_add;
 127 }
 128
 129 static void
 130 gtk_viewport_set_arg (GtkObject        *object,
 131                       GtkArg           *arg,
 132                       guint             arg_id)
 133 {
 134   GtkViewport *viewport;
 135
 136   viewport = GTK_VIEWPORT (object);
 137
 138   switch (arg_id)
 139     {
 140       GtkAdjustment *adjustment;
 141
 142     case ARG_HADJUSTMENT:
 143       adjustment = GTK_VALUE_POINTER (*arg);
 144       gtk_viewport_set_hadjustment (viewport, adjustment);
 145       break;
 146     case ARG_VADJUSTMENT:
 147       adjustment = GTK_VALUE_POINTER (*arg);
 148       gtk_viewport_set_vadjustment (viewport, adjustment);
 149       break;
 150     case ARG_SHADOW_TYPE:
 151       gtk_viewport_set_shadow_type (viewport, GTK_VALUE_ENUM (*arg));
 152       break;
 153     default:
 154       break;
 155     }
 156 }
 157
 158 static void
 159 gtk_viewport_get_arg (GtkObject        *object,
 160                       GtkArg           *arg,
 161                       guint             arg_id)
 162 {
 163   GtkViewport *viewport;
 164
 165   viewport = GTK_VIEWPORT (object);
 166
 167   switch (arg_id)
 168     {
 169     case ARG_HADJUSTMENT:
 170       GTK_VALUE_POINTER (*arg) = viewport->hadjustment;
 171       break;
 172     case ARG_VADJUSTMENT:
 173       GTK_VALUE_POINTER (*arg) = viewport->vadjustment;
 174       break;
 175     case ARG_SHADOW_TYPE:
 176       GTK_VALUE_ENUM (*arg) = viewport->shadow_type;
 177       break;
 178     default:
 179       arg->type = GTK_TYPE_INVALID;
 180       break;
 181     }
 182 }
 183
 184 static void
 185 gtk_viewport_init (GtkViewport *viewport)
 186 {
 187   GTK_WIDGET_UNSET_FLAGS (viewport, GTK_NO_WINDOW);
 188   GTK_WIDGET_SET_FLAGS (viewport, GTK_BASIC);
 189
 190   gtk_container_set_resize_mode (GTK_CONTAINER (viewport), GTK_RESIZE_QUEUE);
 191
 192   viewport->shadow_type = GTK_SHADOW_IN;
 193   viewport->view_window = NULL;
 194   viewport->bin_window = NULL;
 195   viewport->hadjustment = NULL;
 196   viewport->vadjustment = NULL;
 197 }
 198
 199 GtkWidget*
 200 gtk_viewport_new (GtkAdjustment *hadjustment,
 201                   GtkAdjustment *vadjustment)
 202 {
 203   GtkViewport *viewport;
 204
 205   viewport = gtk_type_new (gtk_viewport_get_type ());
 206
 207   gtk_viewport_set_hadjustment (viewport, hadjustment);
 208   gtk_viewport_set_vadjustment (viewport, vadjustment);
 209
 210   return GTK_WIDGET (viewport);
 211 }
 212
 213 static void
 214 gtk_viewport_finalize (GtkObject *object)
 215 {
 216   GtkViewport *viewport = GTK_VIEWPORT (object);
 217
 218   gtk_object_unref (GTK_OBJECT (viewport->hadjustment));
 219   gtk_object_unref (GTK_OBJECT (viewport->vadjustment));
 220
 221   GTK_OBJECT_CLASS(parent_class)->finalize (object);
 222 }
 223
 224 GtkAdjustment*
 225 gtk_viewport_get_hadjustment (GtkViewport *viewport)
 226 {
 227   g_return_val_if_fail (viewport != NULL, NULL);
 228   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 229
 230   return viewport->hadjustment;
 231 }
 232
 233 GtkAdjustment*
 234 gtk_viewport_get_vadjustment (GtkViewport *viewport)
 235 {
 236   g_return_val_if_fail (viewport != NULL, NULL);
 237   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 238
 239   return viewport->vadjustment;
 240 }
 241
 242 void
 243 gtk_viewport_set_hadjustment (GtkViewport   *viewport,
 244                               GtkAdjustment *adjustment)
 245 {
 246   g_return_if_fail (viewport != NULL);
 247   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 248   if (adjustment)
 249     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 250
 251   if (viewport->hadjustment && viewport->hadjustment != adjustment)
 252     {
 253       gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->hadjustment),
 254                                      (gpointer) viewport);
 255       gtk_object_unref (GTK_OBJECT (viewport->hadjustment));
 256     }
 257
 258   if (!adjustment)
 259     adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
 260                                                      0.0, 0.0, 0.0));
 261
 262   if (viewport->hadjustment != adjustment)
 263     {
 264       viewport->hadjustment = adjustment;
 265       gtk_object_ref (GTK_OBJECT (viewport->hadjustment));
 266       gtk_object_sink (GTK_OBJECT (viewport->hadjustment));
 267
 268       gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
 269                           (GtkSignalFunc) gtk_viewport_adjustment_changed,
 270                           (gpointer) viewport);
 271       gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
 272                           (GtkSignalFunc) gtk_viewport_adjustment_value_changed,
 273                           (gpointer) viewport);
 274
 275       gtk_viewport_adjustment_changed (adjustment, viewport);
 276     }
 277 }
 278
 279 void
 280 gtk_viewport_set_vadjustment (GtkViewport   *viewport,
 281                               GtkAdjustment *adjustment)
 282 {
 283   g_return_if_fail (viewport != NULL);
 284   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 285   if (adjustment)
 286     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 287
 288   if (viewport->vadjustment && viewport->vadjustment != adjustment)
 289     {
 290       gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->vadjustment),
 291                                      (gpointer) viewport);
 292       gtk_object_unref (GTK_OBJECT (viewport->vadjustment));
 293     }
 294
 295   if (!adjustment)
 296     adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
 297                                                      0.0, 0.0, 0.0));
 298
 299   if (viewport->vadjustment != adjustment)
 300     {
 301       viewport->vadjustment = adjustment;
 302       gtk_object_ref (GTK_OBJECT (viewport->vadjustment));
 303       gtk_object_sink (GTK_OBJECT (viewport->vadjustment));
 304
 305       gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
 306                           (GtkSignalFunc) gtk_viewport_adjustment_changed,
 307                           (gpointer) viewport);
 308       gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
 309                           (GtkSignalFunc) gtk_viewport_adjustment_value_changed,
 310                           (gpointer) viewport);
 311
 312       gtk_viewport_adjustment_changed (adjustment, viewport);
 313     }
 314 }
 315
 316 void
 317 gtk_viewport_set_shadow_type (GtkViewport   *viewport,
 318                               GtkShadowType  type)
 319 {
 320   g_return_if_fail (viewport != NULL);
 321   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 322
 323   if ((GtkShadowType) viewport->shadow_type != type)
 324     {
 325       viewport->shadow_type = type;
 326
 327       if (GTK_WIDGET_VISIBLE (viewport))
 328         {
 329           gtk_widget_size_allocate (GTK_WIDGET (viewport), &(GTK_WIDGET (viewport)->allocation));
 330           gtk_widget_queue_draw (GTK_WIDGET (viewport));
 331         }
 332     }
 333 }
 334
 335
 336 static void
 337 gtk_viewport_map (GtkWidget *widget)
 338 {
 339   GtkBin *bin;
 340
 341   g_return_if_fail (widget != NULL);
 342   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 343
 344   GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 345   bin = GTK_BIN (widget);
 346
 347   gdk_window_show (widget->window);
 348
 349   if (bin->child &&
 350       GTK_WIDGET_VISIBLE (bin->child) &&
 351       !GTK_WIDGET_MAPPED (bin->child))
 352     gtk_widget_map (bin->child);
 353 }
 354
 355 static void
 356 gtk_viewport_unmap (GtkWidget *widget)
 357 {
 358   g_return_if_fail (widget != NULL);
 359   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 360
 361   GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);
 362
 363   gdk_window_hide (widget->window);
 364 }
 365
 366 static void
 367 gtk_viewport_realize (GtkWidget *widget)
 368 {
 369   GtkBin *bin;
 370   GtkViewport *viewport;
 371   GdkWindowAttr attributes;
 372   gint attributes_mask;
 373   gint event_mask;
 374   gint border_width;
 375
 376   g_return_if_fail (widget != NULL);
 377   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 378
 379   border_width = GTK_CONTAINER (widget)->border_width;
 380
 381   bin = GTK_BIN (widget);
 382   viewport = GTK_VIEWPORT (widget);
 383   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 384
 385   attributes.x = widget->allocation.x + border_width;
 386   attributes.y = widget->allocation.y + border_width;
 387   attributes.width = widget->allocation.width - border_width * 2;
 388   attributes.height = widget->allocation.height - border_width * 2;
 389   attributes.window_type = GDK_WINDOW_CHILD;
 390   attributes.wclass = GDK_INPUT_OUTPUT;
 391   attributes.visual = gtk_widget_get_visual (widget);
 392   attributes.colormap = gtk_widget_get_colormap (widget);
 393
 394   event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 395   attributes.event_mask = event_mask;
 396
 397   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 398
 399   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 400                                    &attributes, attributes_mask);
 401   gdk_window_set_user_data (widget->window, viewport);
 402
 403   if (viewport->shadow_type != GTK_SHADOW_NONE)
 404     {
 405       attributes.x = widget->style->klass->xthickness;
 406       attributes.y = widget->style->klass->ythickness;
 407     }
 408   else
 409     {
 410       attributes.x = 0;
 411       attributes.y = 0;
 412     }
 413
 414   attributes.width = MAX (1, widget->allocation.width - attributes.x * 2 - border_width * 2);
 415   attributes.height = MAX (1, widget->allocation.height - attributes.y * 2 - border_width * 2);
 416   attributes.event_mask = 0;
 417
 418   viewport->view_window = gdk_window_new (widget->window, &attributes, attributes_mask);
 419   gdk_window_set_user_data (viewport->view_window, viewport);
 420
 421   attributes.x = 0;
 422   attributes.y = 0;
 423
 424   if (bin->child)
 425     {
 426       attributes.width = viewport->hadjustment->upper;
 427       attributes.height = viewport->vadjustment->upper;
 428     }
 429
 430   attributes.event_mask = event_mask;
 431
 432   viewport->bin_window = gdk_window_new (viewport->view_window, &attributes, attributes_mask);
 433   gdk_window_set_user_data (viewport->bin_window, viewport);
 434
 435   if (bin->child)
 436     gtk_widget_set_parent_window (bin->child, viewport->bin_window);
 437
 438   widget->style = gtk_style_attach (widget->style, widget->window);
 439   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 440   gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 441
 442   gdk_window_show (viewport->bin_window);
 443   gdk_window_show (viewport->view_window);
 444 }
 445
 446 static void
 447 gtk_viewport_unrealize (GtkWidget *widget)
 448 {
 449   GtkViewport *viewport;
 450
 451   g_return_if_fail (widget != NULL);
 452   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 453
 454   viewport = GTK_VIEWPORT (widget);
 455
 456   gdk_window_set_user_data (viewport->view_window, NULL);
 457   gdk_window_destroy (viewport->view_window);
 458   viewport->view_window = NULL;
 459
 460   gdk_window_set_user_data (viewport->bin_window, NULL);
 461   gdk_window_destroy (viewport->bin_window);
 462   viewport->bin_window = NULL;
 463
 464   if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 465     (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 466 }
 467
 468 static void
 469 gtk_viewport_paint (GtkWidget    *widget,
 470                     GdkRectangle *area)
 471 {
 472   GtkViewport *viewport;
 473
 474   g_return_if_fail (widget != NULL);
 475   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 476   g_return_if_fail (area != NULL);
 477
 478   if (GTK_WIDGET_DRAWABLE (widget))
 479     {
 480       viewport = GTK_VIEWPORT (widget);
 481
 482       gtk_draw_shadow (widget->style, widget->window,
 483                        GTK_STATE_NORMAL, viewport->shadow_type,
 484                        0, 0, -1, -1);
 485     }
 486 }
 487
 488 static void
 489 gtk_viewport_draw (GtkWidget    *widget,
 490                    GdkRectangle *area)
 491 {
 492   GtkViewport *viewport;
 493   GtkBin *bin;
 494   GdkRectangle tmp_area;
 495   GdkRectangle child_area;
 496   gint border_width;
 497
 498   g_return_if_fail (widget != NULL);
 499   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 500   g_return_if_fail (area != NULL);
 501
 502   if (GTK_WIDGET_DRAWABLE (widget))
 503     {
 504       viewport = GTK_VIEWPORT (widget);
 505       bin = GTK_BIN (widget);
 506
 507       border_width = GTK_CONTAINER (widget)->border_width;
 508
 509       tmp_area = *area;
 510       tmp_area.x -= border_width;
 511       tmp_area.y -= border_width;
 512
 513       gtk_viewport_paint (widget, &tmp_area);
 514
 515       if (bin->child)
 516         {
 517           tmp_area.x += viewport->hadjustment->value - widget->style->klass->xthickness;
 518           tmp_area.y += viewport->vadjustment->value - widget->style->klass->ythickness;
 519
 520           if (gtk_widget_intersect (bin->child, &tmp_area, &child_area))
 521             gtk_widget_draw (bin->child, &child_area);
 522         }
 523     }
 524 }
 525
 526 static gint
 527 gtk_viewport_expose (GtkWidget      *widget,
 528                      GdkEventExpose *event)
 529 {
 530   GtkViewport *viewport;
 531   GtkBin *bin;
 532   GdkEventExpose child_event;
 533
 534   g_return_val_if_fail (widget != NULL, FALSE);
 535   g_return_val_if_fail (GTK_IS_VIEWPORT (widget), FALSE);
 536   g_return_val_if_fail (event != NULL, FALSE);
 537
 538   if (GTK_WIDGET_DRAWABLE (widget))
 539     {
 540       viewport = GTK_VIEWPORT (widget);
 541       bin = GTK_BIN (widget);
 542
 543       if (event->window == widget->window)
 544         gtk_viewport_paint (widget, &event->area);
 545
 546       child_event = *event;
 547       if ((event->window == viewport->bin_window) &&
 548           (bin->child != NULL) &&
 549           GTK_WIDGET_NO_WINDOW (bin->child) &&
 550           gtk_widget_intersect (bin->child, &event->area, &child_event.area))
 551         gtk_widget_event (bin->child, (GdkEvent*) &child_event);
 552     }
 553
 554   return FALSE;
 555 }
 556
 557 static void
 558 gtk_viewport_add (GtkContainer *container,
 559                   GtkWidget    *child)
 560 {
 561   GtkBin *bin;
 562
 563   g_return_if_fail (container != NULL);
 564   g_return_if_fail (GTK_IS_VIEWPORT (container));
 565   g_return_if_fail (child != NULL);
 566
 567   bin = GTK_BIN (container);
 568   g_return_if_fail (bin->child == NULL);
 569
 570   gtk_widget_set_parent_window (child, GTK_VIEWPORT (bin)->bin_window);
 571
 572   GTK_CONTAINER_CLASS (parent_class)->add (container, child);
 573 }
 574
 575 static void
 576 gtk_viewport_size_request (GtkWidget      *widget,
 577                            GtkRequisition *requisition)
 578 {
 579   GtkViewport *viewport;
 580   GtkBin *bin;
 581
 582   g_return_if_fail (widget != NULL);
 583   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 584   g_return_if_fail (requisition != NULL);
 585
 586   viewport = GTK_VIEWPORT (widget);
 587   bin = GTK_BIN (widget);
 588
 589   requisition->width = (GTK_CONTAINER (widget)->border_width +
 590                         GTK_WIDGET (widget)->style->klass->xthickness) * 2 + 5;
 591
 592   requisition->height = (GTK_CONTAINER (widget)->border_width * 2 +
 593                          GTK_WIDGET (widget)->style->klass->ythickness) * 2 + 5;
 594
 595   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 596     gtk_widget_size_request (bin->child, &bin->child->requisition);
 597 }
 598
 599 static void
 600 gtk_viewport_size_allocate (GtkWidget     *widget,
 601                             GtkAllocation *allocation)
 602 {
 603   GtkViewport *viewport;
 604   GtkBin *bin;
 605   GtkAllocation child_allocation;
 606   gint hval, vval;
 607   gint border_width;
 608
 609   g_return_if_fail (widget != NULL);
 610   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 611   g_return_if_fail (allocation != NULL);
 612
 613   widget->allocation = *allocation;
 614   viewport = GTK_VIEWPORT (widget);
 615   bin = GTK_BIN (widget);
 616
 617   border_width = GTK_CONTAINER (widget)->border_width;
 618
 619   child_allocation.x = 0;
 620   child_allocation.y = 0;
 621
 622   if (viewport->shadow_type != GTK_SHADOW_NONE)
 623     {
 624       child_allocation.x = GTK_WIDGET (viewport)->style->klass->xthickness;
 625       child_allocation.y = GTK_WIDGET (viewport)->style->klass->ythickness;
 626     }
 627
 628   child_allocation.width = MAX (1, allocation->width - child_allocation.x * 2 - border_width * 2);
 629   child_allocation.height = MAX (1, allocation->height - child_allocation.y * 2 - border_width * 2);
 630
 631   if (GTK_WIDGET_REALIZED (widget))
 632     {
 633       gdk_window_move_resize (widget->window,
 634                               allocation->x + border_width,
 635                               allocation->y + border_width,
 636                               allocation->width - border_width * 2,
 637                               allocation->height - border_width * 2);
 638
 639       gdk_window_move_resize (viewport->view_window,
 640                               child_allocation.x,
 641                               child_allocation.y,
 642                               child_allocation.width,
 643                               child_allocation.height);
 644     }
 645
 646   viewport->hadjustment->page_size = child_allocation.width;
 647   viewport->hadjustment->page_increment = viewport->hadjustment->page_size / 2;
 648   viewport->hadjustment->step_increment = 10;
 649
 650   viewport->vadjustment->page_size = child_allocation.height;
 651   viewport->vadjustment->page_increment = viewport->vadjustment->page_size / 2;
 652   viewport->vadjustment->step_increment = 10;
 653
 654   hval = viewport->hadjustment->value;
 655   vval = viewport->vadjustment->value;
 656
 657   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 658     {
 659       viewport->hadjustment->lower = 0;
 660       viewport->hadjustment->upper = MAX (bin->child->requisition.width,
 661                                           child_allocation.width);
 662
 663       hval = CLAMP (hval, 0,
 664                     viewport->hadjustment->upper -
 665                     viewport->hadjustment->page_size);
 666
 667       viewport->vadjustment->lower = 0;
 668       viewport->vadjustment->upper = MAX (bin->child->requisition.height,
 669                                           child_allocation.height);
 670
 671       vval = CLAMP (vval, 0,
 672                     viewport->vadjustment->upper -
 673                     viewport->vadjustment->page_size);
 674     }
 675
 676   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 677     {
 678       child_allocation.x = 0;
 679       child_allocation.y = 0;
 680
 681       child_allocation.width = viewport->hadjustment->upper;
 682       child_allocation.height = viewport->vadjustment->upper;
 683
 684       if (!GTK_WIDGET_REALIZED (widget))
 685         gtk_widget_realize (widget);
 686
 687       gdk_window_resize (viewport->bin_window,
 688                          child_allocation.width,
 689                          child_allocation.height);
 690
 691       child_allocation.x = 0;
 692       child_allocation.y = 0;
 693       gtk_widget_size_allocate (bin->child, &child_allocation);
 694     }
 695
 696   gtk_signal_emit_by_name (GTK_OBJECT (viewport->hadjustment), "changed");
 697   gtk_signal_emit_by_name (GTK_OBJECT (viewport->vadjustment), "changed");
 698   if (viewport->hadjustment->value != hval)
 699     {
 700       viewport->hadjustment->value = hval;
 701       gtk_signal_emit_by_name (GTK_OBJECT (viewport->hadjustment), "value_changed");
 702     }
 703   if (viewport->vadjustment->value != vval)
 704     {
 705       viewport->vadjustment->value = vval;
 706       gtk_signal_emit_by_name (GTK_OBJECT (viewport->vadjustment), "value_changed");
 707     }
 708 }
 709
 710 static void
 711 gtk_viewport_adjustment_changed (GtkAdjustment *adjustment,
 712                                  gpointer       data)
 713 {
 714   GtkViewport *viewport;
 715
 716   g_return_if_fail (adjustment != NULL);
 717   g_return_if_fail (data != NULL);
 718   g_return_if_fail (GTK_IS_VIEWPORT (data));
 719
 720   viewport = GTK_VIEWPORT (data);
 721 }
 722
 723 static void
 724 gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
 725                                        gpointer       data)
 726 {
 727   GtkViewport *viewport;
 728   GtkBin *bin;
 729   GtkAllocation child_allocation;
 730   gint width, height;
 731
 732   g_return_if_fail (adjustment != NULL);
 733   g_return_if_fail (data != NULL);
 734   g_return_if_fail (GTK_IS_VIEWPORT (data));
 735
 736   viewport = GTK_VIEWPORT (data);
 737   bin = GTK_BIN (data);
 738
 739   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 740     {
 741       gdk_window_get_size (viewport->view_window, &width, &height);
 742
 743       child_allocation.x = 0;
 744       child_allocation.y = 0;
 745
 746       if (viewport->hadjustment->lower != (viewport->hadjustment->upper -
 747                                            viewport->hadjustment->page_size))
 748         child_allocation.x =  viewport->hadjustment->lower - viewport->hadjustment->value;
 749
 750       if (viewport->vadjustment->lower != (viewport->vadjustment->upper -
 751                                            viewport->vadjustment->page_size))
 752         child_allocation.y = viewport->vadjustment->lower - viewport->vadjustment->value;
 753
 754       if (GTK_WIDGET_REALIZED (viewport))
 755         gdk_window_move (viewport->bin_window,
 756                          child_allocation.x,
 757                          child_allocation.y);
 758     }
 759 }