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 static void gtk_viewport_style_set                (GtkWidget *widget,
  61                                                    GtkStyle  *previous_style);
  62
  63 static GtkBinClass *parent_class;
  64
  65 GtkType
  66 gtk_viewport_get_type (void)
  67 {
  68   static GtkType viewport_type = 0;
  69
  70   if (!viewport_type)
  71     {
  72       GtkTypeInfo viewport_info =
  73       {
  74         "GtkViewport",
  75         sizeof (GtkViewport),
  76         sizeof (GtkViewportClass),
  77         (GtkClassInitFunc) gtk_viewport_class_init,
  78         (GtkObjectInitFunc) gtk_viewport_init,
  79         /* reserved_1 */ NULL,
  80         /* reserved_2 */ NULL,
  81         (GtkClassInitFunc) NULL,
  82       };
  83
  84       viewport_type = gtk_type_unique (GTK_TYPE_BIN, &viewport_info);
  85     }
  86
  87   return viewport_type;
  88 }
  89
  90 static void
  91 gtk_viewport_class_init (GtkViewportClass *class)
  92 {
  93   GtkObjectClass *object_class;
  94   GtkWidgetClass *widget_class;
  95   GtkContainerClass *container_class;
  96
  97   object_class = (GtkObjectClass*) class;
  98   widget_class = (GtkWidgetClass*) class;
  99   container_class = (GtkContainerClass*) class;
 100   parent_class = (GtkBinClass*) gtk_type_class (GTK_TYPE_BIN);
 101
 102   gtk_object_add_arg_type ("GtkViewport::hadjustment",
 103                            GTK_TYPE_ADJUSTMENT,
 104                            GTK_ARG_READWRITE | GTK_ARG_CONSTRUCT,
 105                            ARG_HADJUSTMENT);
 106   gtk_object_add_arg_type ("GtkViewport::vadjustment",
 107                            GTK_TYPE_ADJUSTMENT,
 108                            GTK_ARG_READWRITE | GTK_ARG_CONSTRUCT,
 109                            ARG_VADJUSTMENT);
 110   gtk_object_add_arg_type ("GtkViewport::shadow_type",
 111                            GTK_TYPE_SHADOW_TYPE,
 112                            GTK_ARG_READWRITE,
 113                            ARG_SHADOW_TYPE);
 114
 115   object_class->set_arg = gtk_viewport_set_arg;
 116   object_class->get_arg = gtk_viewport_get_arg;
 117   object_class->finalize = gtk_viewport_finalize;
 118
 119   widget_class->map = gtk_viewport_map;
 120   widget_class->unmap = gtk_viewport_unmap;
 121   widget_class->realize = gtk_viewport_realize;
 122   widget_class->unrealize = gtk_viewport_unrealize;
 123   widget_class->draw = gtk_viewport_draw;
 124   widget_class->expose_event = gtk_viewport_expose;
 125   widget_class->size_request = gtk_viewport_size_request;
 126   widget_class->size_allocate = gtk_viewport_size_allocate;
 127   widget_class->style_set = gtk_viewport_style_set;
 128
 129   container_class->add = gtk_viewport_add;
 130 }
 131
 132 static void
 133 gtk_viewport_set_arg (GtkObject        *object,
 134                       GtkArg           *arg,
 135                       guint             arg_id)
 136 {
 137   GtkViewport *viewport;
 138
 139   viewport = GTK_VIEWPORT (object);
 140
 141   switch (arg_id)
 142     {
 143       GtkAdjustment *adjustment;
 144
 145     case ARG_HADJUSTMENT:
 146       adjustment = GTK_VALUE_POINTER (*arg);
 147       gtk_viewport_set_hadjustment (viewport, adjustment);
 148       break;
 149     case ARG_VADJUSTMENT:
 150       adjustment = GTK_VALUE_POINTER (*arg);
 151       gtk_viewport_set_vadjustment (viewport, adjustment);
 152       break;
 153     case ARG_SHADOW_TYPE:
 154       gtk_viewport_set_shadow_type (viewport, GTK_VALUE_ENUM (*arg));
 155       break;
 156     default:
 157       break;
 158     }
 159 }
 160
 161 static void
 162 gtk_viewport_get_arg (GtkObject        *object,
 163                       GtkArg           *arg,
 164                       guint             arg_id)
 165 {
 166   GtkViewport *viewport;
 167
 168   viewport = GTK_VIEWPORT (object);
 169
 170   switch (arg_id)
 171     {
 172     case ARG_HADJUSTMENT:
 173       GTK_VALUE_POINTER (*arg) = viewport->hadjustment;
 174       break;
 175     case ARG_VADJUSTMENT:
 176       GTK_VALUE_POINTER (*arg) = viewport->vadjustment;
 177       break;
 178     case ARG_SHADOW_TYPE:
 179       GTK_VALUE_ENUM (*arg) = viewport->shadow_type;
 180       break;
 181     default:
 182       arg->type = GTK_TYPE_INVALID;
 183       break;
 184     }
 185 }
 186
 187 static void
 188 gtk_viewport_init (GtkViewport *viewport)
 189 {
 190   GTK_WIDGET_UNSET_FLAGS (viewport, GTK_NO_WINDOW);
 191   GTK_WIDGET_SET_FLAGS (viewport, GTK_BASIC);
 192
 193   gtk_container_set_resize_mode (GTK_CONTAINER (viewport), GTK_RESIZE_QUEUE);
 194
 195   viewport->shadow_type = GTK_SHADOW_IN;
 196   viewport->view_window = NULL;
 197   viewport->bin_window = NULL;
 198   viewport->hadjustment = NULL;
 199   viewport->vadjustment = NULL;
 200 }
 201
 202 GtkWidget*
 203 gtk_viewport_new (GtkAdjustment *hadjustment,
 204                   GtkAdjustment *vadjustment)
 205 {
 206   GtkViewport *viewport;
 207
 208   viewport = gtk_type_new (gtk_viewport_get_type ());
 209
 210   gtk_viewport_set_hadjustment (viewport, hadjustment);
 211   gtk_viewport_set_vadjustment (viewport, vadjustment);
 212
 213   return GTK_WIDGET (viewport);
 214 }
 215
 216 static void
 217 gtk_viewport_finalize (GtkObject *object)
 218 {
 219   GtkViewport *viewport = GTK_VIEWPORT (object);
 220
 221   gtk_object_unref (GTK_OBJECT (viewport->hadjustment));
 222   gtk_object_unref (GTK_OBJECT (viewport->vadjustment));
 223
 224   GTK_OBJECT_CLASS(parent_class)->finalize (object);
 225 }
 226
 227 GtkAdjustment*
 228 gtk_viewport_get_hadjustment (GtkViewport *viewport)
 229 {
 230   g_return_val_if_fail (viewport != NULL, NULL);
 231   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 232
 233   return viewport->hadjustment;
 234 }
 235
 236 GtkAdjustment*
 237 gtk_viewport_get_vadjustment (GtkViewport *viewport)
 238 {
 239   g_return_val_if_fail (viewport != NULL, NULL);
 240   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 241
 242   return viewport->vadjustment;
 243 }
 244
 245 void
 246 gtk_viewport_set_hadjustment (GtkViewport   *viewport,
 247                               GtkAdjustment *adjustment)
 248 {
 249   g_return_if_fail (viewport != NULL);
 250   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 251   if (adjustment)
 252     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 253
 254   if (viewport->hadjustment && viewport->hadjustment != adjustment)
 255     {
 256       gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->hadjustment),
 257                                      (gpointer) viewport);
 258       gtk_object_unref (GTK_OBJECT (viewport->hadjustment));
 259     }
 260
 261   if (!adjustment)
 262     adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
 263                                                      0.0, 0.0, 0.0));
 264
 265   if (viewport->hadjustment != adjustment)
 266     {
 267       viewport->hadjustment = adjustment;
 268       gtk_object_ref (GTK_OBJECT (viewport->hadjustment));
 269       gtk_object_sink (GTK_OBJECT (viewport->hadjustment));
 270
 271       gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
 272                           (GtkSignalFunc) gtk_viewport_adjustment_changed,
 273                           (gpointer) viewport);
 274       gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
 275                           (GtkSignalFunc) gtk_viewport_adjustment_value_changed,
 276                           (gpointer) viewport);
 277
 278       gtk_viewport_adjustment_changed (adjustment, viewport);
 279     }
 280 }
 281
 282 void
 283 gtk_viewport_set_vadjustment (GtkViewport   *viewport,
 284                               GtkAdjustment *adjustment)
 285 {
 286   g_return_if_fail (viewport != NULL);
 287   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 288   if (adjustment)
 289     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 290
 291   if (viewport->vadjustment && viewport->vadjustment != adjustment)
 292     {
 293       gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->vadjustment),
 294                                      (gpointer) viewport);
 295       gtk_object_unref (GTK_OBJECT (viewport->vadjustment));
 296     }
 297
 298   if (!adjustment)
 299     adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
 300                                                      0.0, 0.0, 0.0));
 301
 302   if (viewport->vadjustment != adjustment)
 303     {
 304       viewport->vadjustment = adjustment;
 305       gtk_object_ref (GTK_OBJECT (viewport->vadjustment));
 306       gtk_object_sink (GTK_OBJECT (viewport->vadjustment));
 307
 308       gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
 309                           (GtkSignalFunc) gtk_viewport_adjustment_changed,
 310                           (gpointer) viewport);
 311       gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
 312                           (GtkSignalFunc) gtk_viewport_adjustment_value_changed,
 313                           (gpointer) viewport);
 314
 315       gtk_viewport_adjustment_changed (adjustment, viewport);
 316     }
 317 }
 318
 319 void
 320 gtk_viewport_set_shadow_type (GtkViewport   *viewport,
 321                               GtkShadowType  type)
 322 {
 323   g_return_if_fail (viewport != NULL);
 324   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 325
 326   if ((GtkShadowType) viewport->shadow_type != type)
 327     {
 328       viewport->shadow_type = type;
 329
 330       if (GTK_WIDGET_VISIBLE (viewport))
 331         {
 332           gtk_widget_size_allocate (GTK_WIDGET (viewport), &(GTK_WIDGET (viewport)->allocation));
 333           gtk_widget_queue_draw (GTK_WIDGET (viewport));
 334         }
 335     }
 336 }
 337
 338
 339 static void
 340 gtk_viewport_map (GtkWidget *widget)
 341 {
 342   GtkBin *bin;
 343
 344   g_return_if_fail (widget != NULL);
 345   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 346
 347   GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 348   bin = GTK_BIN (widget);
 349
 350   gdk_window_show (widget->window);
 351
 352   if (bin->child &&
 353       GTK_WIDGET_VISIBLE (bin->child) &&
 354       !GTK_WIDGET_MAPPED (bin->child))
 355     gtk_widget_map (bin->child);
 356 }
 357
 358 static void
 359 gtk_viewport_unmap (GtkWidget *widget)
 360 {
 361   g_return_if_fail (widget != NULL);
 362   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 363
 364   GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);
 365
 366   gdk_window_hide (widget->window);
 367 }
 368
 369 static void
 370 gtk_viewport_realize (GtkWidget *widget)
 371 {
 372   GtkBin *bin;
 373   GtkViewport *viewport;
 374   GdkWindowAttr attributes;
 375   gint attributes_mask;
 376   gint event_mask;
 377   gint border_width;
 378
 379   g_return_if_fail (widget != NULL);
 380   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 381
 382   border_width = GTK_CONTAINER (widget)->border_width;
 383
 384   bin = GTK_BIN (widget);
 385   viewport = GTK_VIEWPORT (widget);
 386   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 387
 388   attributes.x = widget->allocation.x + border_width;
 389   attributes.y = widget->allocation.y + border_width;
 390   attributes.width = widget->allocation.width - border_width * 2;
 391   attributes.height = widget->allocation.height - border_width * 2;
 392   attributes.window_type = GDK_WINDOW_CHILD;
 393   attributes.wclass = GDK_INPUT_OUTPUT;
 394   attributes.visual = gtk_widget_get_visual (widget);
 395   attributes.colormap = gtk_widget_get_colormap (widget);
 396
 397   event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 398   attributes.event_mask = event_mask;
 399
 400   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 401
 402   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 403                                    &attributes, attributes_mask);
 404   gdk_window_set_user_data (widget->window, viewport);
 405
 406   if (viewport->shadow_type != GTK_SHADOW_NONE)
 407     {
 408       attributes.x = widget->style->klass->xthickness;
 409       attributes.y = widget->style->klass->ythickness;
 410     }
 411   else
 412     {
 413       attributes.x = 0;
 414       attributes.y = 0;
 415     }
 416
 417   attributes.width = MAX (1, widget->allocation.width - attributes.x * 2 - border_width * 2);
 418   attributes.height = MAX (1, widget->allocation.height - attributes.y * 2 - border_width * 2);
 419   attributes.event_mask = 0;
 420
 421   viewport->view_window = gdk_window_new (widget->window, &attributes, attributes_mask);
 422   gdk_window_set_user_data (viewport->view_window, viewport);
 423
 424   attributes.x = 0;
 425   attributes.y = 0;
 426
 427   if (bin->child)
 428     {
 429       attributes.width = viewport->hadjustment->upper;
 430       attributes.height = viewport->vadjustment->upper;
 431     }
 432
 433   attributes.event_mask = event_mask;
 434
 435   viewport->bin_window = gdk_window_new (viewport->view_window, &attributes, attributes_mask);
 436   gdk_window_set_user_data (viewport->bin_window, viewport);
 437
 438   if (bin->child)
 439     gtk_widget_set_parent_window (bin->child, viewport->bin_window);
 440
 441   widget->style = gtk_style_attach (widget->style, widget->window);
 442   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 443   gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 444
 445    gtk_paint_flat_box(widget->style, viewport->bin_window, GTK_STATE_NORMAL,
 446                       GTK_SHADOW_NONE,
 447                       NULL, widget, "viewportbin",
 448                       0, 0, -1, -1);
 449
 450   gdk_window_show (viewport->bin_window);
 451   gdk_window_show (viewport->view_window);
 452 }
 453
 454 static void
 455 gtk_viewport_unrealize (GtkWidget *widget)
 456 {
 457   GtkViewport *viewport;
 458
 459   g_return_if_fail (widget != NULL);
 460   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 461
 462   viewport = GTK_VIEWPORT (widget);
 463
 464   gdk_window_set_user_data (viewport->view_window, NULL);
 465   gdk_window_destroy (viewport->view_window);
 466   viewport->view_window = NULL;
 467
 468   gdk_window_set_user_data (viewport->bin_window, NULL);
 469   gdk_window_destroy (viewport->bin_window);
 470   viewport->bin_window = NULL;
 471
 472   if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 473     (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 474 }
 475
 476 static void
 477 gtk_viewport_paint (GtkWidget    *widget,
 478                     GdkRectangle *area)
 479 {
 480   GtkViewport *viewport;
 481
 482   g_return_if_fail (widget != NULL);
 483   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 484   g_return_if_fail (area != NULL);
 485
 486   if (GTK_WIDGET_DRAWABLE (widget))
 487     {
 488       viewport = GTK_VIEWPORT (widget);
 489
 490       gtk_draw_shadow (widget->style, widget->window,
 491                        GTK_STATE_NORMAL, viewport->shadow_type,
 492                        0, 0, -1, -1);
 493     }
 494 }
 495
 496 static void
 497 gtk_viewport_draw (GtkWidget    *widget,
 498                    GdkRectangle *area)
 499 {
 500   GtkViewport *viewport;
 501   GtkBin *bin;
 502   GdkRectangle tmp_area;
 503   GdkRectangle child_area;
 504   gint border_width;
 505
 506   g_return_if_fail (widget != NULL);
 507   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 508   g_return_if_fail (area != NULL);
 509
 510   if (GTK_WIDGET_DRAWABLE (widget))
 511     {
 512       viewport = GTK_VIEWPORT (widget);
 513       bin = GTK_BIN (widget);
 514
 515       border_width = GTK_CONTAINER (widget)->border_width;
 516
 517       tmp_area = *area;
 518       tmp_area.x -= border_width;
 519       tmp_area.y -= border_width;
 520
 521       gtk_viewport_paint (widget, &tmp_area);
 522
 523       if (bin->child)
 524         {
 525           tmp_area.x += viewport->hadjustment->value - widget->style->klass->xthickness;
 526           tmp_area.y += viewport->vadjustment->value - widget->style->klass->ythickness;
 527
 528           if (gtk_widget_intersect (bin->child, &tmp_area, &child_area))
 529             gtk_widget_draw (bin->child, &child_area);
 530         }
 531     }
 532 }
 533
 534 static gint
 535 gtk_viewport_expose (GtkWidget      *widget,
 536                      GdkEventExpose *event)
 537 {
 538   GtkViewport *viewport;
 539   GtkBin *bin;
 540   GdkEventExpose child_event;
 541
 542   g_return_val_if_fail (widget != NULL, FALSE);
 543   g_return_val_if_fail (GTK_IS_VIEWPORT (widget), FALSE);
 544   g_return_val_if_fail (event != NULL, FALSE);
 545
 546   if (GTK_WIDGET_DRAWABLE (widget))
 547     {
 548       viewport = GTK_VIEWPORT (widget);
 549       bin = GTK_BIN (widget);
 550
 551       if (event->window == widget->window)
 552         gtk_viewport_paint (widget, &event->area);
 553
 554       child_event = *event;
 555       if ((event->window == viewport->bin_window) &&
 556           (bin->child != NULL) &&
 557           GTK_WIDGET_NO_WINDOW (bin->child) &&
 558           gtk_widget_intersect (bin->child, &event->area, &child_event.area))
 559         gtk_widget_event (bin->child, (GdkEvent*) &child_event);
 560     }
 561
 562   return FALSE;
 563 }
 564
 565 static void
 566 gtk_viewport_add (GtkContainer *container,
 567                   GtkWidget    *child)
 568 {
 569   GtkBin *bin;
 570
 571   g_return_if_fail (container != NULL);
 572   g_return_if_fail (GTK_IS_VIEWPORT (container));
 573   g_return_if_fail (child != NULL);
 574
 575   bin = GTK_BIN (container);
 576   g_return_if_fail (bin->child == NULL);
 577
 578   gtk_widget_set_parent_window (child, GTK_VIEWPORT (bin)->bin_window);
 579
 580   GTK_CONTAINER_CLASS (parent_class)->add (container, child);
 581 }
 582
 583 static void
 584 gtk_viewport_size_request (GtkWidget      *widget,
 585                            GtkRequisition *requisition)
 586 {
 587   GtkViewport *viewport;
 588   GtkBin *bin;
 589
 590   g_return_if_fail (widget != NULL);
 591   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 592   g_return_if_fail (requisition != NULL);
 593
 594   viewport = GTK_VIEWPORT (widget);
 595   bin = GTK_BIN (widget);
 596
 597   requisition->width = (GTK_CONTAINER (widget)->border_width +
 598                         GTK_WIDGET (widget)->style->klass->xthickness) * 2 + 5;
 599
 600   requisition->height = (GTK_CONTAINER (widget)->border_width * 2 +
 601                          GTK_WIDGET (widget)->style->klass->ythickness) * 2 + 5;
 602
 603   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 604     gtk_widget_size_request (bin->child, &bin->child->requisition);
 605 }
 606
 607 static void
 608 gtk_viewport_size_allocate (GtkWidget     *widget,
 609                             GtkAllocation *allocation)
 610 {
 611   GtkViewport *viewport;
 612   GtkBin *bin;
 613   GtkAllocation child_allocation;
 614   gint hval, vval;
 615   gint border_width;
 616
 617   g_return_if_fail (widget != NULL);
 618   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 619   g_return_if_fail (allocation != NULL);
 620
 621   widget->allocation = *allocation;
 622   viewport = GTK_VIEWPORT (widget);
 623   bin = GTK_BIN (widget);
 624
 625   border_width = GTK_CONTAINER (widget)->border_width;
 626
 627   child_allocation.x = 0;
 628   child_allocation.y = 0;
 629
 630   if (viewport->shadow_type != GTK_SHADOW_NONE)
 631     {
 632       child_allocation.x = GTK_WIDGET (viewport)->style->klass->xthickness;
 633       child_allocation.y = GTK_WIDGET (viewport)->style->klass->ythickness;
 634     }
 635
 636   child_allocation.width = MAX (1, allocation->width - child_allocation.x * 2 - border_width * 2);
 637   child_allocation.height = MAX (1, allocation->height - child_allocation.y * 2 - border_width * 2);
 638
 639   if (GTK_WIDGET_REALIZED (widget))
 640     {
 641       gdk_window_move_resize (widget->window,
 642                               allocation->x + border_width,
 643                               allocation->y + border_width,
 644                               allocation->width - border_width * 2,
 645                               allocation->height - border_width * 2);
 646
 647       gdk_window_move_resize (viewport->view_window,
 648                               child_allocation.x,
 649                               child_allocation.y,
 650                               child_allocation.width,
 651                               child_allocation.height);
 652        gtk_paint_flat_box(widget->style, viewport->bin_window, GTK_STATE_NORMAL,
 653                           GTK_SHADOW_NONE,
 654                           NULL, widget, "viewportbin",
 655                           0, 0, -1, -1);
 656     }
 657
 658   viewport->hadjustment->page_size = child_allocation.width;
 659   viewport->hadjustment->page_increment = viewport->hadjustment->page_size / 2;
 660   viewport->hadjustment->step_increment = 10;
 661
 662   viewport->vadjustment->page_size = child_allocation.height;
 663   viewport->vadjustment->page_increment = viewport->vadjustment->page_size / 2;
 664   viewport->vadjustment->step_increment = 10;
 665
 666   hval = viewport->hadjustment->value;
 667   vval = viewport->vadjustment->value;
 668
 669   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 670     {
 671       viewport->hadjustment->lower = 0;
 672       viewport->hadjustment->upper = MAX (bin->child->requisition.width,
 673                                           child_allocation.width);
 674
 675       hval = CLAMP (hval, 0,
 676                     viewport->hadjustment->upper -
 677                     viewport->hadjustment->page_size);
 678
 679       viewport->vadjustment->lower = 0;
 680       viewport->vadjustment->upper = MAX (bin->child->requisition.height,
 681                                           child_allocation.height);
 682
 683       vval = CLAMP (vval, 0,
 684                     viewport->vadjustment->upper -
 685                     viewport->vadjustment->page_size);
 686     }
 687
 688   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 689     {
 690       child_allocation.x = 0;
 691       child_allocation.y = 0;
 692
 693       child_allocation.width = viewport->hadjustment->upper;
 694       child_allocation.height = viewport->vadjustment->upper;
 695
 696       if (!GTK_WIDGET_REALIZED (widget))
 697         gtk_widget_realize (widget);
 698
 699       gdk_window_resize (viewport->bin_window,
 700                          child_allocation.width,
 701                          child_allocation.height);
 702
 703       child_allocation.x = 0;
 704       child_allocation.y = 0;
 705       gtk_widget_size_allocate (bin->child, &child_allocation);
 706     }
 707
 708   gtk_signal_emit_by_name (GTK_OBJECT (viewport->hadjustment), "changed");
 709   gtk_signal_emit_by_name (GTK_OBJECT (viewport->vadjustment), "changed");
 710   if (viewport->hadjustment->value != hval)
 711     {
 712       viewport->hadjustment->value = hval;
 713       gtk_signal_emit_by_name (GTK_OBJECT (viewport->hadjustment), "value_changed");
 714     }
 715   if (viewport->vadjustment->value != vval)
 716     {
 717       viewport->vadjustment->value = vval;
 718       gtk_signal_emit_by_name (GTK_OBJECT (viewport->vadjustment), "value_changed");
 719     }
 720 }
 721
 722 static void
 723 gtk_viewport_adjustment_changed (GtkAdjustment *adjustment,
 724                                  gpointer       data)
 725 {
 726   GtkViewport *viewport;
 727
 728   g_return_if_fail (adjustment != NULL);
 729   g_return_if_fail (data != NULL);
 730   g_return_if_fail (GTK_IS_VIEWPORT (data));
 731
 732   viewport = GTK_VIEWPORT (data);
 733 }
 734
 735 static void
 736 gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
 737                                        gpointer       data)
 738 {
 739   GtkViewport *viewport;
 740   GtkBin *bin;
 741   GtkAllocation child_allocation;
 742   gint width, height;
 743
 744   g_return_if_fail (adjustment != NULL);
 745   g_return_if_fail (data != NULL);
 746   g_return_if_fail (GTK_IS_VIEWPORT (data));
 747
 748   viewport = GTK_VIEWPORT (data);
 749   bin = GTK_BIN (data);
 750
 751   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 752     {
 753       gdk_window_get_size (viewport->view_window, &width, &height);
 754
 755       child_allocation.x = 0;
 756       child_allocation.y = 0;
 757
 758       if (viewport->hadjustment->lower != (viewport->hadjustment->upper -
 759                                            viewport->hadjustment->page_size))
 760         child_allocation.x =  viewport->hadjustment->lower - viewport->hadjustment->value;
 761
 762       if (viewport->vadjustment->lower != (viewport->vadjustment->upper -
 763                                            viewport->vadjustment->page_size))
 764         child_allocation.y = viewport->vadjustment->lower - viewport->vadjustment->value;
 765
 766       if (GTK_WIDGET_REALIZED (viewport))
 767         gdk_window_move (viewport->bin_window,
 768                          child_allocation.x,
 769                          child_allocation.y);
 770     }
 771 }
 772
 773 static void
 774 gtk_viewport_style_set (GtkWidget *widget,
 775                         GtkStyle  *previous_style)
 776 {
 777    GtkViewport *viewport;
 778
 779    if (GTK_WIDGET_REALIZED (widget) &&
 780        !GTK_WIDGET_NO_WINDOW (widget))
 781      {
 782         viewport = GTK_VIEWPORT (widget);
 783
 784         gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 785         gtk_style_set_background (widget->style, widget->window, widget->state);
 786         gtk_paint_flat_box(widget->style, viewport->bin_window, GTK_STATE_NORMAL,
 787                            GTK_SHADOW_NONE,
 788                            NULL, widget, "viewportbin",
 789                            0, 0, -1, -1);
 790         if (GTK_WIDGET_DRAWABLE (widget))
 791           {
 792              gdk_window_clear (widget->window);
 793              gdk_window_clear (viewport->bin_window);
 794           }
 795      }
 796 }