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 Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GTK+ Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #include <config.h>
  28 #include "gtkviewport.h"
  29 #include "gtkintl.h"
  30 #include "gtkmarshalers.h"
  31 #include "gtkprivate.h"
  32 #include "gtkalias.h"
  33
  34 enum {
  35   PROP_0,
  36   PROP_HADJUSTMENT,
  37   PROP_VADJUSTMENT,
  38   PROP_SHADOW_TYPE
  39 };
  40
  41
  42 static void gtk_viewport_class_init               (GtkViewportClass *klass);
  43 static void gtk_viewport_init                     (GtkViewport      *viewport);
  44 static void gtk_viewport_finalize                 (GObject          *object);
  45 static void gtk_viewport_destroy                  (GtkObject        *object);
  46 static void gtk_viewport_set_property             (GObject         *object,
  47                                                    guint            prop_id,
  48                                                    const GValue    *value,
  49                                                    GParamSpec      *pspec);
  50 static void gtk_viewport_get_property             (GObject         *object,
  51                                                    guint            prop_id,
  52                                                    GValue          *value,
  53                                                    GParamSpec      *pspec);
  54 static void gtk_viewport_set_scroll_adjustments   (GtkViewport      *viewport,
  55                                                    GtkAdjustment    *hadjustment,
  56                                                    GtkAdjustment    *vadjustment);
  57 static void gtk_viewport_realize                  (GtkWidget        *widget);
  58 static void gtk_viewport_unrealize                (GtkWidget        *widget);
  59 static void gtk_viewport_paint                    (GtkWidget        *widget,
  60                                                    GdkRectangle     *area);
  61 static gint gtk_viewport_expose                   (GtkWidget        *widget,
  62                                                    GdkEventExpose   *event);
  63 static void gtk_viewport_add                      (GtkContainer     *container,
  64                                                    GtkWidget        *widget);
  65 static void gtk_viewport_size_request             (GtkWidget        *widget,
  66                                                    GtkRequisition   *requisition);
  67 static void gtk_viewport_size_allocate            (GtkWidget        *widget,
  68                                                    GtkAllocation    *allocation);
  69 static void gtk_viewport_adjustment_value_changed (GtkAdjustment    *adjustment,
  70                                                    gpointer          data);
  71 static void gtk_viewport_style_set                (GtkWidget *widget,
  72                                                    GtkStyle  *previous_style);
  73
  74 static GtkBinClass *parent_class;
  75
  76 GType
  77 gtk_viewport_get_type (void)
  78 {
  79   static GType viewport_type = 0;
  80
  81   if (!viewport_type)
  82     {
  83       static const GTypeInfo viewport_info =
  84       {
  85         sizeof (GtkViewportClass),
  86         NULL,           /* base_init */
  87         NULL,           /* base_finalize */
  88         (GClassInitFunc) gtk_viewport_class_init,
  89         NULL,           /* class_finalize */
  90         NULL,           /* class_data */
  91         sizeof (GtkViewport),
  92         0,              /* n_preallocs */
  93         (GInstanceInitFunc) gtk_viewport_init,
  94       };
  95
  96       viewport_type = g_type_register_static (GTK_TYPE_BIN, "GtkViewport",
  97                                               &viewport_info, 0);
  98     }
  99
 100   return viewport_type;
 101 }
 102
 103 static void
 104 gtk_viewport_class_init (GtkViewportClass *class)
 105 {
 106   GtkObjectClass *object_class;
 107   GObjectClass   *gobject_class;
 108   GtkWidgetClass *widget_class;
 109   GtkContainerClass *container_class;
 110
 111   object_class = (GtkObjectClass*) class;
 112   gobject_class = G_OBJECT_CLASS (class);
 113   widget_class = (GtkWidgetClass*) class;
 114   container_class = (GtkContainerClass*) class;
 115
 116   parent_class = g_type_class_peek_parent (class);
 117
 118   gobject_class->finalize = gtk_viewport_finalize;
 119   gobject_class->set_property = gtk_viewport_set_property;
 120   gobject_class->get_property = gtk_viewport_get_property;
 121   object_class->destroy = gtk_viewport_destroy;
 122
 123   widget_class->realize = gtk_viewport_realize;
 124   widget_class->unrealize = gtk_viewport_unrealize;
 125   widget_class->expose_event = gtk_viewport_expose;
 126   widget_class->size_request = gtk_viewport_size_request;
 127   widget_class->size_allocate = gtk_viewport_size_allocate;
 128   widget_class->style_set = gtk_viewport_style_set;
 129
 130   container_class->add = gtk_viewport_add;
 131
 132   class->set_scroll_adjustments = gtk_viewport_set_scroll_adjustments;
 133
 134   g_object_class_install_property (gobject_class,
 135                                    PROP_HADJUSTMENT,
 136                                    g_param_spec_object ("hadjustment",
 137                                                         P_("Horizontal adjustment"),
 138                                                         P_("The GtkAdjustment that determines the values of the horizontal position for this viewport"),
 139                                                         GTK_TYPE_ADJUSTMENT,
 140                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 141
 142   g_object_class_install_property (gobject_class,
 143                                    PROP_VADJUSTMENT,
 144                                    g_param_spec_object ("vadjustment",
 145                                                         P_("Vertical adjustment"),
 146                                                         P_("The GtkAdjustment that determines the values of the vertical position for this viewport"),
 147                                                         GTK_TYPE_ADJUSTMENT,
 148                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 149
 150   g_object_class_install_property (gobject_class,
 151                                    PROP_SHADOW_TYPE,
 152                                    g_param_spec_enum ("shadow-type",
 153                                                       P_("Shadow type"),
 154                                                       P_("Determines how the shadowed box around the viewport is drawn"),
 155                                                       GTK_TYPE_SHADOW_TYPE,
 156                                                       GTK_SHADOW_IN,
 157                                                       GTK_PARAM_READWRITE));
 158
 159   widget_class->set_scroll_adjustments_signal =
 160     g_signal_new ("set_scroll_adjustments",
 161                   G_OBJECT_CLASS_TYPE (gobject_class),
 162                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 163                   G_STRUCT_OFFSET (GtkViewportClass, set_scroll_adjustments),
 164                   NULL, NULL,
 165                   _gtk_marshal_VOID__OBJECT_OBJECT,
 166                   G_TYPE_NONE, 2,
 167                   GTK_TYPE_ADJUSTMENT,
 168                   GTK_TYPE_ADJUSTMENT);
 169 }
 170
 171 static void
 172 gtk_viewport_set_property (GObject         *object,
 173                            guint            prop_id,
 174                            const GValue    *value,
 175                            GParamSpec      *pspec)
 176 {
 177   GtkViewport *viewport;
 178
 179   viewport = GTK_VIEWPORT (object);
 180
 181   switch (prop_id)
 182     {
 183     case PROP_HADJUSTMENT:
 184       gtk_viewport_set_hadjustment (viewport, g_value_get_object (value));
 185       break;
 186     case PROP_VADJUSTMENT:
 187       gtk_viewport_set_vadjustment (viewport, g_value_get_object (value));
 188       break;
 189     case PROP_SHADOW_TYPE:
 190       gtk_viewport_set_shadow_type (viewport, g_value_get_enum (value));
 191       break;
 192     default:
 193       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 194       break;
 195     }
 196 }
 197
 198 static void
 199 gtk_viewport_get_property (GObject         *object,
 200                            guint            prop_id,
 201                            GValue          *value,
 202                            GParamSpec      *pspec)
 203 {
 204   GtkViewport *viewport;
 205
 206   viewport = GTK_VIEWPORT (object);
 207
 208   switch (prop_id)
 209     {
 210     case PROP_HADJUSTMENT:
 211       g_value_set_object (value, viewport->hadjustment);
 212       break;
 213     case PROP_VADJUSTMENT:
 214       g_value_set_object (value, viewport->vadjustment);
 215       break;
 216     case PROP_SHADOW_TYPE:
 217       g_value_set_enum (value, viewport->shadow_type);
 218       break;
 219     default:
 220       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 221       break;
 222     }
 223 }
 224
 225 static void
 226 gtk_viewport_init (GtkViewport *viewport)
 227 {
 228   GTK_WIDGET_UNSET_FLAGS (viewport, GTK_NO_WINDOW);
 229
 230   gtk_widget_set_redraw_on_allocate (GTK_WIDGET (viewport), FALSE);
 231   gtk_container_set_resize_mode (GTK_CONTAINER (viewport), GTK_RESIZE_QUEUE);
 232
 233   viewport->shadow_type = GTK_SHADOW_IN;
 234   viewport->view_window = NULL;
 235   viewport->bin_window = NULL;
 236   viewport->hadjustment = NULL;
 237   viewport->vadjustment = NULL;
 238 }
 239
 240 /**
 241  * gtk_viewport_new:
 242  * @hadjustment: horizontal adjustment.
 243  * @vadjustment: vertical adjustment.
 244  * @returns: a new #GtkViewport.
 245  *
 246  * Creates a new #GtkViewport with the given adjustments.
 247  *
 248  **/
 249 GtkWidget*
 250 gtk_viewport_new (GtkAdjustment *hadjustment,
 251                   GtkAdjustment *vadjustment)
 252 {
 253   GtkWidget *viewport;
 254
 255   viewport = gtk_widget_new (GTK_TYPE_VIEWPORT,
 256                              "hadjustment", hadjustment,
 257                              "vadjustment", vadjustment,
 258                              NULL);
 259
 260   return viewport;
 261 }
 262
 263 #define ADJUSTMENT_POINTER(viewport, orientation)         \
 264   (((orientation) == GTK_ORIENTATION_HORIZONTAL) ?        \
 265      &(viewport)->hadjustment : &(viewport)->vadjustment)
 266
 267 static void
 268 viewport_disconnect_adjustment (GtkViewport    *viewport,
 269                                 GtkOrientation  orientation)
 270 {
 271   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 272
 273   if (*adjustmentp)
 274     {
 275       g_signal_handlers_disconnect_by_func (*adjustmentp,
 276                                             gtk_viewport_adjustment_value_changed,
 277                                             viewport);
 278       g_object_unref (*adjustmentp);
 279       *adjustmentp = NULL;
 280     }
 281 }
 282
 283 static void
 284 gtk_viewport_finalize (GObject *object)
 285 {
 286   GtkViewport *viewport = GTK_VIEWPORT (object);
 287
 288   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
 289   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
 290
 291   G_OBJECT_CLASS (parent_class)->finalize (object);
 292 }
 293
 294 static void
 295 gtk_viewport_destroy (GtkObject *object)
 296 {
 297   GtkViewport *viewport = GTK_VIEWPORT (object);
 298
 299   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
 300   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
 301
 302   GTK_OBJECT_CLASS (parent_class)->destroy (object);
 303 }
 304
 305 /**
 306  * gtk_viewport_get_hadjustment:
 307  * @viewport: a #GtkViewport.
 308  *
 309  * Returns the horizontal adjustment of the viewport.
 310  *
 311  * Return value: the horizontal adjustment of @viewport.
 312  **/
 313 GtkAdjustment*
 314 gtk_viewport_get_hadjustment (GtkViewport *viewport)
 315 {
 316   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 317
 318   if (!viewport->hadjustment)
 319     gtk_viewport_set_hadjustment (viewport, NULL);
 320
 321   return viewport->hadjustment;
 322 }
 323
 324 /**
 325  * gtk_viewport_get_vadjustment:
 326  * @viewport: a #GtkViewport.
 327  *
 328  * Returns the vertical adjustment of the viewport.
 329  *
 330  * Return value: the vertical adjustment of @viewport.
 331  **/
 332 GtkAdjustment*
 333 gtk_viewport_get_vadjustment (GtkViewport *viewport)
 334 {
 335   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 336
 337   if (!viewport->vadjustment)
 338     gtk_viewport_set_vadjustment (viewport, NULL);
 339
 340   return viewport->vadjustment;
 341 }
 342
 343 static void
 344 viewport_get_view_allocation (GtkViewport   *viewport,
 345                               GtkAllocation *view_allocation)
 346 {
 347   GtkWidget *widget = GTK_WIDGET (viewport);
 348   GtkAllocation *allocation = &widget->allocation;
 349   gint border_width = GTK_CONTAINER (viewport)->border_width;
 350
 351   view_allocation->x = 0;
 352   view_allocation->y = 0;
 353
 354   if (viewport->shadow_type != GTK_SHADOW_NONE)
 355     {
 356       view_allocation->x = widget->style->xthickness;
 357       view_allocation->y = widget->style->ythickness;
 358     }
 359
 360   view_allocation->width = MAX (1, allocation->width - view_allocation->x * 2 - border_width * 2);
 361   view_allocation->height = MAX (1, allocation->height - view_allocation->y * 2 - border_width * 2);
 362 }
 363
 364 static void
 365 viewport_reclamp_adjustment (GtkAdjustment *adjustment,
 366                              gboolean      *value_changed)
 367 {
 368   gdouble value = adjustment->value;
 369
 370   value = CLAMP (value, 0, adjustment->upper - adjustment->page_size);
 371   if (value != adjustment->value)
 372     {
 373       adjustment->value = value;
 374       if (value_changed)
 375         *value_changed = TRUE;
 376     }
 377   else if (value_changed)
 378     *value_changed = FALSE;
 379 }
 380
 381 static void
 382 viewport_set_hadjustment_values (GtkViewport *viewport,
 383                                  gboolean    *value_changed)
 384 {
 385   GtkBin *bin = GTK_BIN (viewport);
 386   GtkAllocation view_allocation;
 387   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 388   gdouble old_page_size;
 389   gdouble old_upper;
 390   gdouble old_value;
 391
 392   viewport_get_view_allocation (viewport, &view_allocation);
 393
 394   old_page_size = hadjustment->page_size;
 395   old_upper = hadjustment->upper;
 396   old_value = hadjustment->value;
 397   hadjustment->page_size = view_allocation.width;
 398   hadjustment->step_increment = view_allocation.width * 0.1;
 399   hadjustment->page_increment = view_allocation.width * 0.9;
 400
 401   hadjustment->lower = 0;
 402
 403   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 404     {
 405       GtkRequisition child_requisition;
 406
 407       gtk_widget_get_child_requisition (bin->child, &child_requisition);
 408       hadjustment->upper = MAX (child_requisition.width, view_allocation.width);
 409     }
 410   else
 411     hadjustment->upper = view_allocation.width;
 412
 413   if (gtk_widget_get_direction (GTK_WIDGET (viewport)) == GTK_TEXT_DIR_RTL)
 414     {
 415       gdouble dist = old_upper - (old_value + old_page_size);
 416       hadjustment->value = hadjustment->upper - dist - hadjustment->page_size;
 417       viewport_reclamp_adjustment (hadjustment, value_changed);
 418       *value_changed = (old_value != hadjustment->value);
 419     }
 420   else
 421     viewport_reclamp_adjustment (hadjustment, value_changed);
 422 }
 423
 424 static void
 425 viewport_set_vadjustment_values (GtkViewport *viewport,
 426                                  gboolean    *value_changed)
 427 {
 428   GtkBin *bin = GTK_BIN (viewport);
 429   GtkAllocation view_allocation;
 430   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 431
 432   viewport_get_view_allocation (viewport, &view_allocation);
 433
 434   vadjustment->page_size = view_allocation.height;
 435   vadjustment->step_increment = view_allocation.height * 0.1;
 436   vadjustment->page_increment = view_allocation.height * 0.9;
 437
 438   vadjustment->lower = 0;
 439
 440   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 441     {
 442       GtkRequisition child_requisition;
 443
 444       gtk_widget_get_child_requisition (bin->child, &child_requisition);
 445       vadjustment->upper = MAX (child_requisition.height, view_allocation.height);
 446     }
 447   else
 448     vadjustment->upper = view_allocation.height;
 449
 450   viewport_reclamp_adjustment (vadjustment, value_changed);
 451 }
 452
 453 static void
 454 viewport_set_adjustment (GtkViewport    *viewport,
 455                          GtkOrientation  orientation,
 456                          GtkAdjustment  *adjustment)
 457 {
 458   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 459   gboolean value_changed;
 460
 461   if (adjustment && adjustment == *adjustmentp)
 462     return;
 463
 464   if (!adjustment)
 465     adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
 466                                                      0.0, 0.0, 0.0));
 467   if (*adjustmentp)
 468     g_object_unref (*adjustmentp);
 469   *adjustmentp = adjustment;
 470   g_object_ref (adjustment);
 471   gtk_object_sink (GTK_OBJECT (adjustment));
 472
 473   if (orientation == GTK_ORIENTATION_HORIZONTAL)
 474     viewport_set_hadjustment_values (viewport, &value_changed);
 475   else
 476     viewport_set_vadjustment_values (viewport, &value_changed);
 477
 478   g_signal_connect (adjustment, "value_changed",
 479                     G_CALLBACK (gtk_viewport_adjustment_value_changed),
 480                     viewport);
 481
 482   gtk_adjustment_changed (adjustment);
 483
 484   if (value_changed)
 485     gtk_adjustment_value_changed (adjustment);
 486   else
 487     gtk_viewport_adjustment_value_changed (adjustment, viewport);
 488 }
 489
 490 /**
 491  * gtk_viewport_set_hadjustment:
 492  * @viewport: a #GtkViewport.
 493  * @adjustment: a #GtkAdjustment.
 494  *
 495  * Sets the horizontal adjustment of the viewport.
 496  **/
 497 void
 498 gtk_viewport_set_hadjustment (GtkViewport   *viewport,
 499                               GtkAdjustment *adjustment)
 500 {
 501   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 502   if (adjustment)
 503     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 504
 505   viewport_set_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL, adjustment);
 506
 507   g_object_notify (G_OBJECT (viewport), "hadjustment");
 508 }
 509
 510 /**
 511  * gtk_viewport_set_vadjustment:
 512  * @viewport: a #GtkViewport.
 513  * @adjustment: a #GtkAdjustment.
 514  *
 515  * Sets the vertical adjustment of the viewport.
 516  **/
 517 void
 518 gtk_viewport_set_vadjustment (GtkViewport   *viewport,
 519                               GtkAdjustment *adjustment)
 520 {
 521   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 522   if (adjustment)
 523     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 524
 525   viewport_set_adjustment (viewport, GTK_ORIENTATION_VERTICAL, adjustment);
 526
 527   g_object_notify (G_OBJECT (viewport), "vadjustment");
 528 }
 529
 530 static void
 531 gtk_viewport_set_scroll_adjustments (GtkViewport      *viewport,
 532                                      GtkAdjustment    *hadjustment,
 533                                      GtkAdjustment    *vadjustment)
 534 {
 535   gtk_viewport_set_hadjustment (viewport, hadjustment);
 536   gtk_viewport_set_vadjustment (viewport, vadjustment);
 537 }
 538
 539 /**
 540  * gtk_viewport_set_shadow_type:
 541  * @viewport: a #GtkViewport.
 542  * @type: the new shadow type.
 543  *
 544  * Sets the shadow type of the viewport.
 545  **/
 546 void
 547 gtk_viewport_set_shadow_type (GtkViewport   *viewport,
 548                               GtkShadowType  type)
 549 {
 550   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 551
 552   if ((GtkShadowType) viewport->shadow_type != type)
 553     {
 554       viewport->shadow_type = type;
 555
 556       if (GTK_WIDGET_VISIBLE (viewport))
 557         {
 558           gtk_widget_size_allocate (GTK_WIDGET (viewport), &(GTK_WIDGET (viewport)->allocation));
 559           gtk_widget_queue_draw (GTK_WIDGET (viewport));
 560         }
 561
 562       g_object_notify (G_OBJECT (viewport), "shadow_type");
 563     }
 564 }
 565
 566 /**
 567  * gtk_viewport_get_shadow_type:
 568  * @viewport: a #GtkViewport
 569  *
 570  * Gets the shadow type of the #GtkViewport. See
 571  * gtk_viewport_set_shadow_type().
 572
 573  * Return value: the shadow type
 574  **/
 575 GtkShadowType
 576 gtk_viewport_get_shadow_type (GtkViewport *viewport)
 577 {
 578   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), GTK_SHADOW_NONE);
 579
 580   return viewport->shadow_type;
 581 }
 582
 583 static void
 584 gtk_viewport_realize (GtkWidget *widget)
 585 {
 586   GtkViewport *viewport = GTK_VIEWPORT (widget);
 587   GtkBin *bin = GTK_BIN (widget);
 588   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 589   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 590   gint border_width = GTK_CONTAINER (widget)->border_width;
 591
 592   GtkAllocation view_allocation;
 593   GdkWindowAttr attributes;
 594   gint attributes_mask;
 595   gint event_mask;
 596
 597   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 598
 599   attributes.x = widget->allocation.x + border_width;
 600   attributes.y = widget->allocation.y + border_width;
 601   attributes.width = widget->allocation.width - border_width * 2;
 602   attributes.height = widget->allocation.height - border_width * 2;
 603   attributes.window_type = GDK_WINDOW_CHILD;
 604   attributes.wclass = GDK_INPUT_OUTPUT;
 605   attributes.visual = gtk_widget_get_visual (widget);
 606   attributes.colormap = gtk_widget_get_colormap (widget);
 607
 608   event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 609   /* We select on button_press_mask so that button 4-5 scrolls are trapped.
 610    */
 611   attributes.event_mask = event_mask | GDK_BUTTON_PRESS_MASK;
 612
 613   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 614
 615   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 616                                    &attributes, attributes_mask);
 617   gdk_window_set_user_data (widget->window, viewport);
 618
 619   viewport_get_view_allocation (viewport, &view_allocation);
 620
 621   attributes.x = view_allocation.x;
 622   attributes.y = view_allocation.y;
 623   attributes.width = view_allocation.width;
 624   attributes.height = view_allocation.height;
 625   attributes.event_mask = 0;
 626
 627   viewport->view_window = gdk_window_new (widget->window, &attributes, attributes_mask);
 628   gdk_window_set_user_data (viewport->view_window, viewport);
 629
 630   gdk_window_set_back_pixmap (viewport->view_window, NULL, FALSE);
 631
 632   attributes.x = - hadjustment->value;
 633   attributes.y = - vadjustment->value;
 634   attributes.width = hadjustment->upper;
 635   attributes.height = vadjustment->upper;
 636
 637   attributes.event_mask = event_mask;
 638
 639   viewport->bin_window = gdk_window_new (viewport->view_window, &attributes, attributes_mask);
 640   gdk_window_set_user_data (viewport->bin_window, viewport);
 641
 642   if (bin->child)
 643     gtk_widget_set_parent_window (bin->child, viewport->bin_window);
 644
 645   widget->style = gtk_style_attach (widget->style, widget->window);
 646   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 647   gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 648
 649   /* Call paint here to allow a theme to set the background without flashing
 650    */
 651   gtk_paint_flat_box(widget->style, viewport->bin_window, GTK_STATE_NORMAL,
 652                      GTK_SHADOW_NONE,
 653                      NULL, widget, "viewportbin",
 654                      0, 0, -1, -1);
 655
 656   gdk_window_show (viewport->bin_window);
 657   gdk_window_show (viewport->view_window);
 658 }
 659
 660 static void
 661 gtk_viewport_unrealize (GtkWidget *widget)
 662 {
 663   GtkViewport *viewport = GTK_VIEWPORT (widget);
 664
 665   gdk_window_set_user_data (viewport->view_window, NULL);
 666   gdk_window_destroy (viewport->view_window);
 667   viewport->view_window = NULL;
 668
 669   gdk_window_set_user_data (viewport->bin_window, NULL);
 670   gdk_window_destroy (viewport->bin_window);
 671   viewport->bin_window = NULL;
 672
 673   if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 674     (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 675 }
 676
 677 static void
 678 gtk_viewport_paint (GtkWidget    *widget,
 679                     GdkRectangle *area)
 680 {
 681   GtkViewport *viewport;
 682
 683   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 684   g_return_if_fail (area != NULL);
 685
 686   if (GTK_WIDGET_DRAWABLE (widget))
 687     {
 688       viewport = GTK_VIEWPORT (widget);
 689
 690       gtk_paint_shadow (widget->style, widget->window,
 691                         GTK_STATE_NORMAL, viewport->shadow_type,
 692                         NULL, widget, "viewport",
 693                         0, 0, -1, -1);
 694     }
 695 }
 696
 697 static gint
 698 gtk_viewport_expose (GtkWidget      *widget,
 699                      GdkEventExpose *event)
 700 {
 701   GtkViewport *viewport;
 702   GtkBin *bin;
 703
 704   if (GTK_WIDGET_DRAWABLE (widget))
 705     {
 706       viewport = GTK_VIEWPORT (widget);
 707       bin = GTK_BIN (widget);
 708
 709       if (event->window == widget->window)
 710         gtk_viewport_paint (widget, &event->area);
 711       else if (event->window == viewport->bin_window)
 712         {
 713           gtk_paint_flat_box(widget->style, viewport->bin_window,
 714                              GTK_STATE_NORMAL, GTK_SHADOW_NONE,
 715                              &event->area, widget, "viewportbin",
 716                              0, 0, -1, -1);
 717
 718           (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
 719         }
 720     }
 721
 722   return FALSE;
 723 }
 724
 725 static void
 726 gtk_viewport_add (GtkContainer *container,
 727                   GtkWidget    *child)
 728 {
 729   GtkBin *bin;
 730
 731   g_return_if_fail (GTK_IS_WIDGET (child));
 732
 733   bin = GTK_BIN (container);
 734   g_return_if_fail (bin->child == NULL);
 735
 736   gtk_widget_set_parent_window (child, GTK_VIEWPORT (bin)->bin_window);
 737
 738   GTK_CONTAINER_CLASS (parent_class)->add (container, child);
 739 }
 740
 741 static void
 742 gtk_viewport_size_request (GtkWidget      *widget,
 743                            GtkRequisition *requisition)
 744 {
 745   GtkViewport *viewport;
 746   GtkBin *bin;
 747   GtkRequisition child_requisition;
 748
 749   viewport = GTK_VIEWPORT (widget);
 750   bin = GTK_BIN (widget);
 751
 752   requisition->width = (GTK_CONTAINER (widget)->border_width +
 753                         GTK_WIDGET (widget)->style->xthickness) * 2;
 754
 755   requisition->height = (GTK_CONTAINER (widget)->border_width * 2 +
 756                          GTK_WIDGET (widget)->style->ythickness) * 2;
 757
 758   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 759     {
 760       gtk_widget_size_request (bin->child, &child_requisition);
 761       requisition->width += child_requisition.width;
 762       requisition->height += child_requisition.height;
 763     }
 764 }
 765
 766 static void
 767 gtk_viewport_size_allocate (GtkWidget     *widget,
 768                             GtkAllocation *allocation)
 769 {
 770   GtkViewport *viewport = GTK_VIEWPORT (widget);
 771   GtkBin *bin = GTK_BIN (widget);
 772   gint border_width = GTK_CONTAINER (widget)->border_width;
 773   gboolean hadjustment_value_changed, vadjustment_value_changed;
 774
 775   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 776   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 777
 778   /* If our size changed, and we have a shadow, queue a redraw on widget->window to
 779    * redraw the shadow correctly.
 780    */
 781   if (GTK_WIDGET_MAPPED (widget) &&
 782       viewport->shadow_type != GTK_SHADOW_NONE &&
 783       (widget->allocation.width != allocation->width ||
 784        widget->allocation.height != allocation->height))
 785     gdk_window_invalidate_rect (widget->window, NULL, FALSE);
 786
 787   widget->allocation = *allocation;
 788
 789   viewport_set_hadjustment_values (viewport, &hadjustment_value_changed);
 790   viewport_set_vadjustment_values (viewport, &vadjustment_value_changed);
 791
 792   if (GTK_WIDGET_REALIZED (widget))
 793     {
 794       GtkAllocation view_allocation;
 795
 796       viewport_get_view_allocation (viewport, &view_allocation);
 797
 798       gdk_window_move_resize (widget->window,
 799                               allocation->x + border_width,
 800                               allocation->y + border_width,
 801                               allocation->width - border_width * 2,
 802                               allocation->height - border_width * 2);
 803
 804       gdk_window_move_resize (viewport->view_window,
 805                               view_allocation.x,
 806                               view_allocation.y,
 807                               view_allocation.width,
 808                               view_allocation.height);
 809     }
 810
 811   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 812     {
 813       GtkAllocation child_allocation;
 814
 815       child_allocation.x = 0;
 816       child_allocation.y = 0;
 817       child_allocation.width = hadjustment->upper;
 818       child_allocation.height = vadjustment->upper;
 819
 820       if (GTK_WIDGET_REALIZED (widget))
 821         gdk_window_move_resize (viewport->bin_window,
 822                                 - hadjustment->value,
 823                                 - vadjustment->value,
 824                                 child_allocation.width,
 825                                 child_allocation.height);
 826
 827       gtk_widget_size_allocate (bin->child, &child_allocation);
 828     }
 829
 830   gtk_adjustment_changed (hadjustment);
 831   gtk_adjustment_changed (vadjustment);
 832   if (hadjustment_value_changed)
 833     gtk_adjustment_value_changed (hadjustment);
 834   if (vadjustment_value_changed)
 835     gtk_adjustment_value_changed (vadjustment);
 836 }
 837
 838 static void
 839 gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
 840                                        gpointer       data)
 841 {
 842   GtkViewport *viewport;
 843   GtkBin *bin;
 844
 845   g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 846   g_return_if_fail (GTK_IS_VIEWPORT (data));
 847
 848   viewport = GTK_VIEWPORT (data);
 849   bin = GTK_BIN (data);
 850
 851   if (bin->child && GTK_WIDGET_VISIBLE (bin->child)  &&
 852       GTK_WIDGET_REALIZED (viewport))
 853     {
 854       GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 855       GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 856       gint old_x, old_y;
 857       gint new_x, new_y;
 858
 859       gdk_window_get_position (viewport->bin_window, &old_x, &old_y);
 860       new_x = - hadjustment->value;
 861       new_y = - vadjustment->value;
 862
 863       if (new_x != old_x || new_y != old_y)
 864         {
 865           gdk_window_move (viewport->bin_window, new_x, new_y);
 866           gdk_window_process_updates (viewport->bin_window, TRUE);
 867         }
 868     }
 869 }
 870
 871 static void
 872 gtk_viewport_style_set (GtkWidget *widget,
 873                         GtkStyle  *previous_style)
 874 {
 875    GtkViewport *viewport;
 876
 877    if (GTK_WIDGET_REALIZED (widget) &&
 878        !GTK_WIDGET_NO_WINDOW (widget))
 879      {
 880         viewport = GTK_VIEWPORT (widget);
 881
 882         gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 883         gtk_style_set_background (widget->style, widget->window, widget->state);
 884      }
 885 }
 886
 887 #define __GTK_VIEWPORT_C__
 888 #include "gtkaliasdef.c"