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
  23 static void gtk_viewport_class_init               (GtkViewportClass *klass);
  24 static void gtk_viewport_init                     (GtkViewport      *viewport);
  25 static void gtk_viewport_finalize                 (GtkObject        *object);
  26 static void gtk_viewport_map                      (GtkWidget        *widget);
  27 static void gtk_viewport_unmap                    (GtkWidget        *widget);
  28 static void gtk_viewport_realize                  (GtkWidget        *widget);
  29 static void gtk_viewport_unrealize                (GtkWidget        *widget);
  30 static void gtk_viewport_paint                    (GtkWidget        *widget,
  31                                                    GdkRectangle     *area);
  32 static void gtk_viewport_draw                     (GtkWidget        *widget,
  33                                                    GdkRectangle     *area);
  34 static gint gtk_viewport_expose                   (GtkWidget        *widget,
  35                                                    GdkEventExpose   *event);
  36 static void gtk_viewport_add                      (GtkContainer     *container,
  37                                                    GtkWidget        *widget);
  38 static void gtk_viewport_size_request             (GtkWidget        *widget,
  39                                                    GtkRequisition   *requisition);
  40 static void gtk_viewport_size_allocate            (GtkWidget        *widget,
  41                                                    GtkAllocation    *allocation);
  42 static void gtk_viewport_adjustment_changed       (GtkAdjustment    *adjustment,
  43                                                    gpointer          data);
  44 static void gtk_viewport_adjustment_value_changed (GtkAdjustment    *adjustment,
  45                                                    gpointer          data);
  46
  47 static GtkBinClass *parent_class;
  48
  49 guint
  50 gtk_viewport_get_type (void)
  51 {
  52   static guint viewport_type = 0;
  53
  54   if (!viewport_type)
  55     {
  56       GtkTypeInfo viewport_info =
  57       {
  58         "GtkViewport",
  59         sizeof (GtkViewport),
  60         sizeof (GtkViewportClass),
  61         (GtkClassInitFunc) gtk_viewport_class_init,
  62         (GtkObjectInitFunc) gtk_viewport_init,
  63         /* reversed_1 */ NULL,
  64         /* reversed_2 */ NULL,
  65         (GtkClassInitFunc) NULL,
  66       };
  67
  68       viewport_type = gtk_type_unique (gtk_bin_get_type (), &viewport_info);
  69     }
  70
  71   return viewport_type;
  72 }
  73
  74 static void
  75 gtk_viewport_class_init (GtkViewportClass *class)
  76 {
  77   GtkObjectClass *object_class;
  78   GtkWidgetClass *widget_class;
  79   GtkContainerClass *container_class;
  80
  81   object_class = (GtkObjectClass*) class;
  82   widget_class = (GtkWidgetClass*) class;
  83   container_class = (GtkContainerClass*) class;
  84   parent_class = (GtkBinClass*) gtk_type_class (gtk_bin_get_type ());
  85
  86   object_class->finalize = gtk_viewport_finalize;
  87
  88   widget_class->map = gtk_viewport_map;
  89   widget_class->unmap = gtk_viewport_unmap;
  90   widget_class->realize = gtk_viewport_realize;
  91   widget_class->unrealize = gtk_viewport_unrealize;
  92   widget_class->draw = gtk_viewport_draw;
  93   widget_class->expose_event = gtk_viewport_expose;
  94   widget_class->size_request = gtk_viewport_size_request;
  95   widget_class->size_allocate = gtk_viewport_size_allocate;
  96
  97   container_class->add = gtk_viewport_add;
  98 }
  99
 100 static void
 101 gtk_viewport_init (GtkViewport *viewport)
 102 {
 103   GTK_WIDGET_UNSET_FLAGS (viewport, GTK_NO_WINDOW);
 104   GTK_WIDGET_SET_FLAGS (viewport, GTK_BASIC);
 105
 106   gtk_container_set_resize_mode (GTK_CONTAINER (viewport), GTK_RESIZE_QUEUE);
 107
 108   viewport->shadow_type = GTK_SHADOW_IN;
 109   viewport->view_window = NULL;
 110   viewport->bin_window = NULL;
 111   viewport->hadjustment = NULL;
 112   viewport->vadjustment = NULL;
 113 }
 114
 115 GtkWidget*
 116 gtk_viewport_new (GtkAdjustment *hadjustment,
 117                   GtkAdjustment *vadjustment)
 118 {
 119   GtkViewport *viewport;
 120
 121   viewport = gtk_type_new (gtk_viewport_get_type ());
 122
 123   if (!hadjustment)
 124     hadjustment = (GtkAdjustment*) gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
 125
 126   if (!vadjustment)
 127     vadjustment = (GtkAdjustment*) gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
 128
 129   gtk_viewport_set_hadjustment (viewport, hadjustment);
 130   gtk_viewport_set_vadjustment (viewport, vadjustment);
 131
 132   return GTK_WIDGET (viewport);
 133 }
 134
 135 static void
 136 gtk_viewport_finalize (GtkObject *object)
 137 {
 138   GtkViewport *viewport = GTK_VIEWPORT (object);
 139
 140   gtk_object_unref (GTK_OBJECT (viewport->hadjustment));
 141   gtk_object_unref (GTK_OBJECT (viewport->vadjustment));
 142
 143   GTK_OBJECT_CLASS(parent_class)->finalize (object);
 144 }
 145
 146 GtkAdjustment*
 147 gtk_viewport_get_hadjustment (GtkViewport *viewport)
 148 {
 149   g_return_val_if_fail (viewport != NULL, NULL);
 150   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 151
 152   return viewport->hadjustment;
 153 }
 154
 155 GtkAdjustment*
 156 gtk_viewport_get_vadjustment (GtkViewport *viewport)
 157 {
 158   g_return_val_if_fail (viewport != NULL, NULL);
 159   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 160
 161   return viewport->vadjustment;
 162 }
 163
 164 void
 165 gtk_viewport_set_hadjustment (GtkViewport   *viewport,
 166                               GtkAdjustment *adjustment)
 167 {
 168   g_return_if_fail (viewport != NULL);
 169   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 170   g_return_if_fail (adjustment != NULL);
 171
 172   if (viewport->hadjustment != adjustment)
 173     {
 174       if (viewport->hadjustment)
 175         {
 176           gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->hadjustment),
 177                                          (gpointer) viewport);
 178           gtk_object_unref (GTK_OBJECT (viewport->hadjustment));
 179         }
 180
 181       viewport->hadjustment = adjustment;
 182       gtk_object_ref (GTK_OBJECT (viewport->hadjustment));
 183       gtk_object_sink (GTK_OBJECT (viewport->hadjustment));
 184
 185       gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
 186                           (GtkSignalFunc) gtk_viewport_adjustment_changed,
 187                           (gpointer) viewport);
 188       gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
 189                           (GtkSignalFunc)gtk_viewport_adjustment_value_changed,
 190                           (gpointer) viewport);
 191
 192       gtk_viewport_adjustment_changed (adjustment, (gpointer) viewport);
 193     }
 194 }
 195
 196 void
 197 gtk_viewport_set_vadjustment (GtkViewport   *viewport,
 198                               GtkAdjustment *adjustment)
 199 {
 200   g_return_if_fail (viewport != NULL);
 201   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 202   g_return_if_fail (adjustment != NULL);
 203
 204   if (viewport->vadjustment != adjustment)
 205     {
 206       if (viewport->vadjustment)
 207         {
 208           gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->vadjustment),
 209                                          (gpointer) viewport);
 210           gtk_object_unref (GTK_OBJECT (viewport->vadjustment));
 211         }
 212
 213       viewport->vadjustment = adjustment;
 214       gtk_object_ref (GTK_OBJECT (viewport->vadjustment));
 215       gtk_object_sink (GTK_OBJECT (viewport->vadjustment));
 216
 217       gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
 218                           (GtkSignalFunc) gtk_viewport_adjustment_changed,
 219                           (gpointer) viewport);
 220       gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
 221                           (GtkSignalFunc)gtk_viewport_adjustment_value_changed,
 222                           (gpointer) viewport);
 223
 224       gtk_viewport_adjustment_changed (adjustment, (gpointer) viewport);
 225     }
 226 }
 227
 228 void
 229 gtk_viewport_set_shadow_type (GtkViewport   *viewport,
 230                               GtkShadowType  type)
 231 {
 232   g_return_if_fail (viewport != NULL);
 233   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 234
 235   if ((GtkShadowType) viewport->shadow_type != type)
 236     {
 237       viewport->shadow_type = type;
 238
 239       if (GTK_WIDGET_VISIBLE (viewport))
 240         {
 241           gtk_widget_size_allocate (GTK_WIDGET (viewport), &(GTK_WIDGET (viewport)->allocation));
 242           gtk_widget_queue_draw (GTK_WIDGET (viewport));
 243         }
 244     }
 245 }
 246
 247
 248 static void
 249 gtk_viewport_map (GtkWidget *widget)
 250 {
 251   GtkBin *bin;
 252
 253   g_return_if_fail (widget != NULL);
 254   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 255
 256   GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 257   bin = GTK_BIN (widget);
 258
 259   gdk_window_show (widget->window);
 260
 261   if (bin->child &&
 262       GTK_WIDGET_VISIBLE (bin->child) &&
 263       !GTK_WIDGET_MAPPED (bin->child))
 264     gtk_widget_map (bin->child);
 265 }
 266
 267 static void
 268 gtk_viewport_unmap (GtkWidget *widget)
 269 {
 270   g_return_if_fail (widget != NULL);
 271   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 272
 273   GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);
 274
 275   gdk_window_hide (widget->window);
 276 }
 277
 278 static void
 279 gtk_viewport_realize (GtkWidget *widget)
 280 {
 281   GtkBin *bin;
 282   GtkViewport *viewport;
 283   GdkWindowAttr attributes;
 284   gint attributes_mask;
 285   gint event_mask;
 286   gint border_width;
 287
 288   g_return_if_fail (widget != NULL);
 289   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 290
 291   border_width = GTK_CONTAINER (widget)->border_width;
 292
 293   bin = GTK_BIN (widget);
 294   viewport = GTK_VIEWPORT (widget);
 295   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 296
 297   attributes.x = widget->allocation.x + border_width;
 298   attributes.y = widget->allocation.y + border_width;
 299   attributes.width = widget->allocation.width - border_width * 2;
 300   attributes.height = widget->allocation.height - border_width * 2;
 301   attributes.window_type = GDK_WINDOW_CHILD;
 302   attributes.wclass = GDK_INPUT_OUTPUT;
 303   attributes.visual = gtk_widget_get_visual (widget);
 304   attributes.colormap = gtk_widget_get_colormap (widget);
 305
 306   event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 307   attributes.event_mask = event_mask;
 308
 309   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 310
 311   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 312                                    &attributes, attributes_mask);
 313   gdk_window_set_user_data (widget->window, viewport);
 314
 315   if (viewport->shadow_type != GTK_SHADOW_NONE)
 316     {
 317       attributes.x = widget->style->klass->xthickness;
 318       attributes.y = widget->style->klass->ythickness;
 319     }
 320   else
 321     {
 322       attributes.x = 0;
 323       attributes.y = 0;
 324     }
 325
 326   attributes.width = MAX (1, widget->allocation.width - attributes.x * 2 - border_width * 2);
 327   attributes.height = MAX (1, widget->allocation.height - attributes.y * 2 - border_width * 2);
 328   attributes.event_mask = 0;
 329
 330   viewport->view_window = gdk_window_new (widget->window, &attributes, attributes_mask);
 331   gdk_window_set_user_data (viewport->view_window, viewport);
 332
 333   attributes.x = 0;
 334   attributes.y = 0;
 335
 336   if (bin->child)
 337     {
 338       attributes.width = viewport->hadjustment->upper;
 339       attributes.height = viewport->vadjustment->upper;
 340     }
 341
 342   attributes.event_mask = event_mask;
 343
 344   viewport->bin_window = gdk_window_new (viewport->view_window, &attributes, attributes_mask);
 345   gdk_window_set_user_data (viewport->bin_window, viewport);
 346
 347   if (bin->child)
 348     gtk_widget_set_parent_window (bin->child, viewport->bin_window);
 349
 350   widget->style = gtk_style_attach (widget->style, widget->window);
 351   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 352   gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 353
 354   gdk_window_show (viewport->bin_window);
 355   gdk_window_show (viewport->view_window);
 356 }
 357
 358 static void
 359 gtk_viewport_unrealize (GtkWidget *widget)
 360 {
 361   GtkViewport *viewport;
 362
 363   g_return_if_fail (widget != NULL);
 364   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 365
 366   viewport = GTK_VIEWPORT (widget);
 367
 368   gdk_window_set_user_data (viewport->view_window, NULL);
 369   gdk_window_destroy (viewport->view_window);
 370   viewport->view_window = NULL;
 371
 372   gdk_window_set_user_data (viewport->bin_window, NULL);
 373   gdk_window_destroy (viewport->bin_window);
 374   viewport->bin_window = NULL;
 375
 376   if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 377     (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 378 }
 379
 380 static void
 381 gtk_viewport_paint (GtkWidget    *widget,
 382                     GdkRectangle *area)
 383 {
 384   GtkViewport *viewport;
 385
 386   g_return_if_fail (widget != NULL);
 387   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 388   g_return_if_fail (area != NULL);
 389
 390   if (GTK_WIDGET_DRAWABLE (widget))
 391     {
 392       viewport = GTK_VIEWPORT (widget);
 393
 394       gtk_draw_shadow (widget->style, widget->window,
 395                        GTK_STATE_NORMAL, viewport->shadow_type,
 396                        0, 0, -1, -1);
 397     }
 398 }
 399
 400 static void
 401 gtk_viewport_draw (GtkWidget    *widget,
 402                    GdkRectangle *area)
 403 {
 404   GtkViewport *viewport;
 405   GtkBin *bin;
 406   GdkRectangle tmp_area;
 407   GdkRectangle child_area;
 408   gint border_width;
 409
 410   g_return_if_fail (widget != NULL);
 411   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 412   g_return_if_fail (area != NULL);
 413
 414   if (GTK_WIDGET_DRAWABLE (widget))
 415     {
 416       viewport = GTK_VIEWPORT (widget);
 417       bin = GTK_BIN (widget);
 418
 419       border_width = GTK_CONTAINER (widget)->border_width;
 420
 421       tmp_area = *area;
 422       tmp_area.x -= border_width;
 423       tmp_area.y -= border_width;
 424
 425       gtk_viewport_paint (widget, &tmp_area);
 426
 427       if (bin->child)
 428         {
 429           tmp_area.x += viewport->hadjustment->value - widget->style->klass->xthickness;
 430           tmp_area.y += viewport->vadjustment->value - widget->style->klass->ythickness;
 431
 432           if (gtk_widget_intersect (bin->child, &tmp_area, &child_area))
 433             gtk_widget_draw (bin->child, &child_area);
 434         }
 435     }
 436 }
 437
 438 static gint
 439 gtk_viewport_expose (GtkWidget      *widget,
 440                      GdkEventExpose *event)
 441 {
 442   GtkViewport *viewport;
 443   GtkBin *bin;
 444   GdkEventExpose child_event;
 445
 446   g_return_val_if_fail (widget != NULL, FALSE);
 447   g_return_val_if_fail (GTK_IS_VIEWPORT (widget), FALSE);
 448   g_return_val_if_fail (event != NULL, FALSE);
 449
 450   if (GTK_WIDGET_DRAWABLE (widget))
 451     {
 452       viewport = GTK_VIEWPORT (widget);
 453       bin = GTK_BIN (widget);
 454
 455       if (event->window == widget->window)
 456         gtk_viewport_paint (widget, &event->area);
 457
 458       child_event = *event;
 459       if ((event->window == viewport->bin_window) &&
 460           (bin->child != NULL) &&
 461           GTK_WIDGET_NO_WINDOW (bin->child) &&
 462           gtk_widget_intersect (bin->child, &event->area, &child_event.area))
 463         gtk_widget_event (bin->child, (GdkEvent*) &child_event);
 464     }
 465
 466   return FALSE;
 467 }
 468
 469 static void
 470 gtk_viewport_add (GtkContainer *container,
 471                   GtkWidget    *widget)
 472 {
 473   GtkBin *bin;
 474
 475   g_return_if_fail (container != NULL);
 476   g_return_if_fail (GTK_IS_VIEWPORT (container));
 477   g_return_if_fail (widget != NULL);
 478
 479   bin = GTK_BIN (container);
 480
 481   if (!bin->child)
 482     {
 483       gtk_widget_set_parent (widget, GTK_WIDGET (container));
 484       gtk_widget_set_parent_window (widget, GTK_VIEWPORT (container)->bin_window);
 485       if (GTK_WIDGET_VISIBLE (widget))
 486         {
 487           if (GTK_WIDGET_MAPPED (widget->parent) &&
 488               !GTK_WIDGET_MAPPED (widget))
 489             gtk_widget_map (widget);
 490         }
 491
 492       bin->child = widget;
 493
 494       if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (container))
 495         gtk_widget_queue_resize (widget);
 496     }
 497 }
 498
 499 static void
 500 gtk_viewport_size_request (GtkWidget      *widget,
 501                            GtkRequisition *requisition)
 502 {
 503   GtkViewport *viewport;
 504   GtkBin *bin;
 505
 506   g_return_if_fail (widget != NULL);
 507   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 508   g_return_if_fail (requisition != NULL);
 509
 510   viewport = GTK_VIEWPORT (widget);
 511   bin = GTK_BIN (widget);
 512
 513   requisition->width = (GTK_CONTAINER (widget)->border_width +
 514                         GTK_WIDGET (widget)->style->klass->xthickness) * 2 + 5;
 515
 516   requisition->height = (GTK_CONTAINER (widget)->border_width * 2 +
 517                          GTK_WIDGET (widget)->style->klass->ythickness) * 2 + 5;
 518
 519   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 520     gtk_widget_size_request (bin->child, &bin->child->requisition);
 521 }
 522
 523 static void
 524 gtk_viewport_size_allocate (GtkWidget     *widget,
 525                             GtkAllocation *allocation)
 526 {
 527   GtkViewport *viewport;
 528   GtkBin *bin;
 529   GtkAllocation child_allocation;
 530   gint hval, vval;
 531   gint border_width;
 532
 533   g_return_if_fail (widget != NULL);
 534   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 535   g_return_if_fail (allocation != NULL);
 536
 537   widget->allocation = *allocation;
 538   viewport = GTK_VIEWPORT (widget);
 539   bin = GTK_BIN (widget);
 540
 541   border_width = GTK_CONTAINER (widget)->border_width;
 542
 543   child_allocation.x = 0;
 544   child_allocation.y = 0;
 545
 546   if (viewport->shadow_type != GTK_SHADOW_NONE)
 547     {
 548       child_allocation.x = GTK_WIDGET (viewport)->style->klass->xthickness;
 549       child_allocation.y = GTK_WIDGET (viewport)->style->klass->ythickness;
 550     }
 551
 552   child_allocation.width = MAX (1, allocation->width - child_allocation.x * 2 - border_width * 2);
 553   child_allocation.height = MAX (1, allocation->height - child_allocation.y * 2 - border_width * 2);
 554
 555   if (GTK_WIDGET_REALIZED (widget))
 556     {
 557       gdk_window_move_resize (widget->window,
 558                               allocation->x + border_width,
 559                               allocation->y + border_width,
 560                               allocation->width - border_width * 2,
 561                               allocation->height - border_width * 2);
 562
 563       gdk_window_move_resize (viewport->view_window,
 564                               child_allocation.x,
 565                               child_allocation.y,
 566                               child_allocation.width,
 567                               child_allocation.height);
 568     }
 569
 570   viewport->hadjustment->page_size = child_allocation.width;
 571   viewport->hadjustment->page_increment = viewport->hadjustment->page_size / 2;
 572   viewport->hadjustment->step_increment = 10;
 573
 574   viewport->vadjustment->page_size = child_allocation.height;
 575   viewport->vadjustment->page_increment = viewport->vadjustment->page_size / 2;
 576   viewport->vadjustment->step_increment = 10;
 577
 578   hval = viewport->hadjustment->value;
 579   vval = viewport->vadjustment->value;
 580
 581   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 582     {
 583       viewport->hadjustment->lower = 0;
 584       viewport->hadjustment->upper = MAX (bin->child->requisition.width,
 585                                           child_allocation.width);
 586
 587       hval = CLAMP (hval, 0,
 588                     viewport->hadjustment->upper -
 589                     viewport->hadjustment->page_size);
 590
 591       viewport->vadjustment->lower = 0;
 592       viewport->vadjustment->upper = MAX (bin->child->requisition.height,
 593                                           child_allocation.height);
 594
 595       vval = CLAMP (vval, 0,
 596                     viewport->vadjustment->upper -
 597                     viewport->vadjustment->page_size);
 598     }
 599
 600   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 601     {
 602       child_allocation.x = 0;
 603       child_allocation.y = 0;
 604
 605       child_allocation.width = viewport->hadjustment->upper;
 606       child_allocation.height = viewport->vadjustment->upper;
 607
 608       if (!GTK_WIDGET_REALIZED (widget))
 609         gtk_widget_realize (widget);
 610
 611       gdk_window_resize (viewport->bin_window,
 612                          child_allocation.width,
 613                          child_allocation.height);
 614
 615       child_allocation.x = 0;
 616       child_allocation.y = 0;
 617       gtk_widget_size_allocate (bin->child, &child_allocation);
 618     }
 619
 620   gtk_signal_emit_by_name (GTK_OBJECT (viewport->hadjustment), "changed");
 621   gtk_signal_emit_by_name (GTK_OBJECT (viewport->vadjustment), "changed");
 622   if (viewport->hadjustment->value != hval)
 623     {
 624       viewport->hadjustment->value = hval;
 625       gtk_signal_emit_by_name (GTK_OBJECT (viewport->hadjustment), "value_changed");
 626     }
 627   if (viewport->vadjustment->value != vval)
 628     {
 629       viewport->vadjustment->value = vval;
 630       gtk_signal_emit_by_name (GTK_OBJECT (viewport->vadjustment), "value_changed");
 631     }
 632 }
 633
 634 static void
 635 gtk_viewport_adjustment_changed (GtkAdjustment *adjustment,
 636                                  gpointer       data)
 637 {
 638   GtkViewport *viewport;
 639
 640   g_return_if_fail (adjustment != NULL);
 641   g_return_if_fail (data != NULL);
 642   g_return_if_fail (GTK_IS_VIEWPORT (data));
 643
 644   viewport = GTK_VIEWPORT (data);
 645 }
 646
 647 static void
 648 gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
 649                                        gpointer       data)
 650 {
 651   GtkViewport *viewport;
 652   GtkBin *bin;
 653   GtkAllocation child_allocation;
 654   gint width, height;
 655
 656   g_return_if_fail (adjustment != NULL);
 657   g_return_if_fail (data != NULL);
 658   g_return_if_fail (GTK_IS_VIEWPORT (data));
 659
 660   viewport = GTK_VIEWPORT (data);
 661   bin = GTK_BIN (data);
 662
 663   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 664     {
 665       gdk_window_get_size (viewport->view_window, &width, &height);
 666
 667       child_allocation.x = 0;
 668       child_allocation.y = 0;
 669
 670       if (viewport->hadjustment->lower != (viewport->hadjustment->upper -
 671                                            viewport->hadjustment->page_size))
 672         child_allocation.x =  viewport->hadjustment->lower - viewport->hadjustment->value;
 673
 674       if (viewport->vadjustment->lower != (viewport->vadjustment->upper -
 675                                            viewport->vadjustment->page_size))
 676         child_allocation.y = viewport->vadjustment->lower - viewport->vadjustment->value;
 677
 678       if (GTK_WIDGET_REALIZED (viewport))
 679         gdk_window_move (viewport->bin_window,
 680                          child_allocation.x,
 681                          child_allocation.y);
 682     }
 683 }