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 "gtkextendedlayout.h"
  30 #include "gtkintl.h"
  31 #include "gtkmarshalers.h"
  32 #include "gtkprivate.h"
  33 #include "gtkalias.h"
  34
  35 enum {
  36   PROP_0,
  37   PROP_HADJUSTMENT,
  38   PROP_VADJUSTMENT,
  39   PROP_SHADOW_TYPE
  40 };
  41
  42
  43 static void gtk_viewport_finalize                 (GObject          *object);
  44 static void gtk_viewport_destroy                  (GtkObject        *object);
  45 static void gtk_viewport_set_property             (GObject         *object,
  46                                                    guint            prop_id,
  47                                                    const GValue    *value,
  48                                                    GParamSpec      *pspec);
  49 static void gtk_viewport_get_property             (GObject         *object,
  50                                                    guint            prop_id,
  51                                                    GValue          *value,
  52                                                    GParamSpec      *pspec);
  53 static void gtk_viewport_set_scroll_adjustments   (GtkViewport      *viewport,
  54                                                    GtkAdjustment    *hadjustment,
  55                                                    GtkAdjustment    *vadjustment);
  56 static void gtk_viewport_realize                  (GtkWidget        *widget);
  57 static void gtk_viewport_unrealize                (GtkWidget        *widget);
  58 static void gtk_viewport_paint                    (GtkWidget        *widget,
  59                                                    GdkRectangle     *area);
  60 static gint gtk_viewport_expose                   (GtkWidget        *widget,
  61                                                    GdkEventExpose   *event);
  62 static void gtk_viewport_add                      (GtkContainer     *container,
  63                                                    GtkWidget        *widget);
  64 static void gtk_viewport_size_allocate            (GtkWidget        *widget,
  65                                                    GtkAllocation    *allocation);
  66 static void gtk_viewport_adjustment_value_changed (GtkAdjustment    *adjustment,
  67                                                    gpointer          data);
  68 static void gtk_viewport_style_set                (GtkWidget *widget,
  69                                                    GtkStyle  *previous_style);
  70
  71 static void gtk_viewport_extended_layout_init     (GtkExtendedLayoutIface *iface);
  72 static void gtk_viewport_get_desired_width        (GtkExtendedLayout       *layout,
  73                                                    gint                    *minimum_size,
  74                                                    gint                    *natural_size);
  75 static void gtk_viewport_get_desired_height       (GtkExtendedLayout       *layout,
  76                                                    gint                    *minimum_size,
  77                                                    gint                    *natural_size);
  78
  79
  80 G_DEFINE_TYPE_WITH_CODE (GtkViewport, gtk_viewport, GTK_TYPE_BIN,
  81                          G_IMPLEMENT_INTERFACE (GTK_TYPE_EXTENDED_LAYOUT,
  82                                                 gtk_viewport_extended_layout_init))
  83
  84 static void
  85 gtk_viewport_class_init (GtkViewportClass *class)
  86 {
  87   GtkObjectClass *object_class;
  88   GObjectClass   *gobject_class;
  89   GtkWidgetClass *widget_class;
  90   GtkContainerClass *container_class;
  91
  92   object_class = (GtkObjectClass*) class;
  93   gobject_class = G_OBJECT_CLASS (class);
  94   widget_class = (GtkWidgetClass*) class;
  95   container_class = (GtkContainerClass*) class;
  96
  97   gobject_class->finalize = gtk_viewport_finalize;
  98   gobject_class->set_property = gtk_viewport_set_property;
  99   gobject_class->get_property = gtk_viewport_get_property;
 100   object_class->destroy = gtk_viewport_destroy;
 101
 102   widget_class->realize = gtk_viewport_realize;
 103   widget_class->unrealize = gtk_viewport_unrealize;
 104   widget_class->expose_event = gtk_viewport_expose;
 105   widget_class->size_allocate = gtk_viewport_size_allocate;
 106   widget_class->style_set = gtk_viewport_style_set;
 107
 108   container_class->add = gtk_viewport_add;
 109
 110   class->set_scroll_adjustments = gtk_viewport_set_scroll_adjustments;
 111
 112   g_object_class_install_property (gobject_class,
 113                                    PROP_HADJUSTMENT,
 114                                    g_param_spec_object ("hadjustment",
 115                                                         P_("Horizontal adjustment"),
 116                                                         P_("The GtkAdjustment that determines the values of the horizontal position for this viewport"),
 117                                                         GTK_TYPE_ADJUSTMENT,
 118                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 119
 120   g_object_class_install_property (gobject_class,
 121                                    PROP_VADJUSTMENT,
 122                                    g_param_spec_object ("vadjustment",
 123                                                         P_("Vertical adjustment"),
 124                                                         P_("The GtkAdjustment that determines the values of the vertical position for this viewport"),
 125                                                         GTK_TYPE_ADJUSTMENT,
 126                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 127
 128   g_object_class_install_property (gobject_class,
 129                                    PROP_SHADOW_TYPE,
 130                                    g_param_spec_enum ("shadow-type",
 131                                                       P_("Shadow type"),
 132                                                       P_("Determines how the shadowed box around the viewport is drawn"),
 133                                                       GTK_TYPE_SHADOW_TYPE,
 134                                                       GTK_SHADOW_IN,
 135                                                       GTK_PARAM_READWRITE));
 136
 137   /**
 138    * GtkViewport::set-scroll-adjustments
 139    * @horizontal: the horizontal #GtkAdjustment
 140    * @vertical: the vertical #GtkAdjustment
 141    *
 142    * Set the scroll adjustments for the viewport. Usually scrolled containers
 143    * like #GtkScrolledWindow will emit this signal to connect two instances
 144    * of #GtkScrollbar to the scroll directions of the #GtkViewport.
 145    */
 146   widget_class->set_scroll_adjustments_signal =
 147     g_signal_new (I_("set-scroll-adjustments"),
 148                   G_OBJECT_CLASS_TYPE (gobject_class),
 149                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 150                   G_STRUCT_OFFSET (GtkViewportClass, set_scroll_adjustments),
 151                   NULL, NULL,
 152                   _gtk_marshal_VOID__OBJECT_OBJECT,
 153                   G_TYPE_NONE, 2,
 154                   GTK_TYPE_ADJUSTMENT,
 155                   GTK_TYPE_ADJUSTMENT);
 156 }
 157
 158 static void
 159 gtk_viewport_set_property (GObject         *object,
 160                            guint            prop_id,
 161                            const GValue    *value,
 162                            GParamSpec      *pspec)
 163 {
 164   GtkViewport *viewport;
 165
 166   viewport = GTK_VIEWPORT (object);
 167
 168   switch (prop_id)
 169     {
 170     case PROP_HADJUSTMENT:
 171       gtk_viewport_set_hadjustment (viewport, g_value_get_object (value));
 172       break;
 173     case PROP_VADJUSTMENT:
 174       gtk_viewport_set_vadjustment (viewport, g_value_get_object (value));
 175       break;
 176     case PROP_SHADOW_TYPE:
 177       gtk_viewport_set_shadow_type (viewport, g_value_get_enum (value));
 178       break;
 179     default:
 180       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 181       break;
 182     }
 183 }
 184
 185 static void
 186 gtk_viewport_get_property (GObject         *object,
 187                            guint            prop_id,
 188                            GValue          *value,
 189                            GParamSpec      *pspec)
 190 {
 191   GtkViewport *viewport;
 192
 193   viewport = GTK_VIEWPORT (object);
 194
 195   switch (prop_id)
 196     {
 197     case PROP_HADJUSTMENT:
 198       g_value_set_object (value, viewport->hadjustment);
 199       break;
 200     case PROP_VADJUSTMENT:
 201       g_value_set_object (value, viewport->vadjustment);
 202       break;
 203     case PROP_SHADOW_TYPE:
 204       g_value_set_enum (value, viewport->shadow_type);
 205       break;
 206     default:
 207       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 208       break;
 209     }
 210 }
 211
 212 static void
 213 gtk_viewport_init (GtkViewport *viewport)
 214 {
 215   gtk_widget_set_has_window (GTK_WIDGET (viewport), TRUE);
 216
 217   gtk_widget_set_redraw_on_allocate (GTK_WIDGET (viewport), FALSE);
 218   gtk_container_set_resize_mode (GTK_CONTAINER (viewport), GTK_RESIZE_QUEUE);
 219
 220   viewport->shadow_type = GTK_SHADOW_IN;
 221   viewport->view_window = NULL;
 222   viewport->bin_window = NULL;
 223   viewport->hadjustment = NULL;
 224   viewport->vadjustment = NULL;
 225 }
 226
 227 /**
 228  * gtk_viewport_new:
 229  * @hadjustment: horizontal adjustment.
 230  * @vadjustment: vertical adjustment.
 231  * @returns: a new #GtkViewport.
 232  *
 233  * Creates a new #GtkViewport with the given adjustments.
 234  *
 235  **/
 236 GtkWidget*
 237 gtk_viewport_new (GtkAdjustment *hadjustment,
 238                   GtkAdjustment *vadjustment)
 239 {
 240   GtkWidget *viewport;
 241
 242   viewport = g_object_new (GTK_TYPE_VIEWPORT,
 243                              "hadjustment", hadjustment,
 244                              "vadjustment", vadjustment,
 245                              NULL);
 246
 247   return viewport;
 248 }
 249
 250 #define ADJUSTMENT_POINTER(viewport, orientation)         \
 251   (((orientation) == GTK_ORIENTATION_HORIZONTAL) ?        \
 252      &(viewport)->hadjustment : &(viewport)->vadjustment)
 253
 254 static void
 255 viewport_disconnect_adjustment (GtkViewport    *viewport,
 256                                 GtkOrientation  orientation)
 257 {
 258   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 259
 260   if (*adjustmentp)
 261     {
 262       g_signal_handlers_disconnect_by_func (*adjustmentp,
 263                                             gtk_viewport_adjustment_value_changed,
 264                                             viewport);
 265       g_object_unref (*adjustmentp);
 266       *adjustmentp = NULL;
 267     }
 268 }
 269
 270 static void
 271 gtk_viewport_finalize (GObject *object)
 272 {
 273   GtkViewport *viewport = GTK_VIEWPORT (object);
 274
 275   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
 276   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
 277
 278   G_OBJECT_CLASS (gtk_viewport_parent_class)->finalize (object);
 279 }
 280
 281 static void
 282 gtk_viewport_destroy (GtkObject *object)
 283 {
 284   GtkViewport *viewport = GTK_VIEWPORT (object);
 285
 286   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
 287   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
 288
 289   GTK_OBJECT_CLASS (gtk_viewport_parent_class)->destroy (object);
 290 }
 291
 292 /**
 293  * gtk_viewport_get_hadjustment:
 294  * @viewport: a #GtkViewport.
 295  *
 296  * Returns the horizontal adjustment of the viewport.
 297  *
 298  * Return value: the horizontal adjustment of @viewport.
 299  **/
 300 GtkAdjustment*
 301 gtk_viewport_get_hadjustment (GtkViewport *viewport)
 302 {
 303   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 304
 305   if (!viewport->hadjustment)
 306     gtk_viewport_set_hadjustment (viewport, NULL);
 307
 308   return viewport->hadjustment;
 309 }
 310
 311 /**
 312  * gtk_viewport_get_vadjustment:
 313  * @viewport: a #GtkViewport.
 314  *
 315  * Returns the vertical adjustment of the viewport.
 316  *
 317  * Return value: the vertical adjustment of @viewport.
 318  **/
 319 GtkAdjustment*
 320 gtk_viewport_get_vadjustment (GtkViewport *viewport)
 321 {
 322   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 323
 324   if (!viewport->vadjustment)
 325     gtk_viewport_set_vadjustment (viewport, NULL);
 326
 327   return viewport->vadjustment;
 328 }
 329
 330 static void
 331 viewport_get_view_allocation (GtkViewport   *viewport,
 332                               GtkAllocation *view_allocation)
 333 {
 334   GtkWidget *widget = GTK_WIDGET (viewport);
 335   GtkAllocation *allocation = &widget->allocation;
 336   gint border_width = GTK_CONTAINER (viewport)->border_width;
 337
 338   view_allocation->x = 0;
 339   view_allocation->y = 0;
 340
 341   if (viewport->shadow_type != GTK_SHADOW_NONE)
 342     {
 343       view_allocation->x = widget->style->xthickness;
 344       view_allocation->y = widget->style->ythickness;
 345     }
 346
 347   view_allocation->width = MAX (1, allocation->width - view_allocation->x * 2 - border_width * 2);
 348   view_allocation->height = MAX (1, allocation->height - view_allocation->y * 2 - border_width * 2);
 349 }
 350
 351 static void
 352 viewport_reclamp_adjustment (GtkAdjustment *adjustment,
 353                              gboolean      *value_changed)
 354 {
 355   gdouble value = adjustment->value;
 356
 357   value = CLAMP (value, 0, adjustment->upper - adjustment->page_size);
 358   if (value != adjustment->value)
 359     {
 360       adjustment->value = value;
 361       if (value_changed)
 362         *value_changed = TRUE;
 363     }
 364   else if (value_changed)
 365     *value_changed = FALSE;
 366 }
 367
 368 static void
 369 viewport_set_hadjustment_values (GtkViewport *viewport,
 370                                  gboolean    *value_changed)
 371 {
 372   GtkBin *bin = GTK_BIN (viewport);
 373   GtkAllocation view_allocation;
 374   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 375   gdouble old_page_size;
 376   gdouble old_upper;
 377   gdouble old_value;
 378
 379   viewport_get_view_allocation (viewport, &view_allocation);
 380
 381   old_page_size = hadjustment->page_size;
 382   old_upper = hadjustment->upper;
 383   old_value = hadjustment->value;
 384   hadjustment->page_size = view_allocation.width;
 385   hadjustment->step_increment = view_allocation.width * 0.1;
 386   hadjustment->page_increment = view_allocation.width * 0.9;
 387
 388   hadjustment->lower = 0;
 389
 390   if (bin->child && gtk_widget_get_visible (bin->child))
 391     {
 392       GtkRequisition child_requisition;
 393
 394       gtk_widget_get_child_requisition (bin->child, &child_requisition);
 395       hadjustment->upper = MAX (child_requisition.width, view_allocation.width);
 396     }
 397   else
 398     hadjustment->upper = view_allocation.width;
 399
 400   if (gtk_widget_get_direction (GTK_WIDGET (viewport)) == GTK_TEXT_DIR_RTL)
 401     {
 402       gdouble dist = old_upper - (old_value + old_page_size);
 403       hadjustment->value = hadjustment->upper - dist - hadjustment->page_size;
 404       viewport_reclamp_adjustment (hadjustment, value_changed);
 405       *value_changed = (old_value != hadjustment->value);
 406     }
 407   else
 408     viewport_reclamp_adjustment (hadjustment, value_changed);
 409 }
 410
 411 static void
 412 viewport_set_vadjustment_values (GtkViewport *viewport,
 413                                  gboolean    *value_changed)
 414 {
 415   GtkBin *bin = GTK_BIN (viewport);
 416   GtkAllocation view_allocation;
 417   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 418
 419   viewport_get_view_allocation (viewport, &view_allocation);
 420
 421   vadjustment->page_size = view_allocation.height;
 422   vadjustment->step_increment = view_allocation.height * 0.1;
 423   vadjustment->page_increment = view_allocation.height * 0.9;
 424
 425   vadjustment->lower = 0;
 426
 427   if (bin->child && gtk_widget_get_visible (bin->child))
 428     {
 429       gint natural_height;
 430
 431       gtk_extended_layout_get_height_for_width (GTK_EXTENDED_LAYOUT (bin->child),
 432                                                 view_allocation.width,
 433                                                 NULL,
 434                                                 &natural_height);
 435       vadjustment->upper = MAX (natural_height, view_allocation.height);
 436     }
 437   else
 438     vadjustment->upper = view_allocation.height;
 439
 440   viewport_reclamp_adjustment (vadjustment, value_changed);
 441 }
 442
 443 static void
 444 viewport_set_adjustment (GtkViewport    *viewport,
 445                          GtkOrientation  orientation,
 446                          GtkAdjustment  *adjustment)
 447 {
 448   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 449   gboolean value_changed;
 450
 451   if (adjustment && adjustment == *adjustmentp)
 452     return;
 453
 454   if (!adjustment)
 455     adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
 456                                                      0.0, 0.0, 0.0));
 457   viewport_disconnect_adjustment (viewport, orientation);
 458   *adjustmentp = adjustment;
 459   g_object_ref_sink (adjustment);
 460
 461   if (orientation == GTK_ORIENTATION_HORIZONTAL)
 462     viewport_set_hadjustment_values (viewport, &value_changed);
 463   else
 464     viewport_set_vadjustment_values (viewport, &value_changed);
 465
 466   g_signal_connect (adjustment, "value-changed",
 467                     G_CALLBACK (gtk_viewport_adjustment_value_changed),
 468                     viewport);
 469
 470   gtk_adjustment_changed (adjustment);
 471
 472   if (value_changed)
 473     gtk_adjustment_value_changed (adjustment);
 474   else
 475     gtk_viewport_adjustment_value_changed (adjustment, viewport);
 476 }
 477
 478 /**
 479  * gtk_viewport_set_hadjustment:
 480  * @viewport: a #GtkViewport.
 481  * @adjustment: (allow-none): a #GtkAdjustment.
 482  *
 483  * Sets the horizontal adjustment of the viewport.
 484  **/
 485 void
 486 gtk_viewport_set_hadjustment (GtkViewport   *viewport,
 487                               GtkAdjustment *adjustment)
 488 {
 489   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 490   if (adjustment)
 491     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 492
 493   viewport_set_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL, adjustment);
 494
 495   g_object_notify (G_OBJECT (viewport), "hadjustment");
 496 }
 497
 498 /**
 499  * gtk_viewport_set_vadjustment:
 500  * @viewport: a #GtkViewport.
 501  * @adjustment: (allow-none): a #GtkAdjustment.
 502  *
 503  * Sets the vertical adjustment of the viewport.
 504  **/
 505 void
 506 gtk_viewport_set_vadjustment (GtkViewport   *viewport,
 507                               GtkAdjustment *adjustment)
 508 {
 509   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 510   if (adjustment)
 511     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 512
 513   viewport_set_adjustment (viewport, GTK_ORIENTATION_VERTICAL, adjustment);
 514
 515   g_object_notify (G_OBJECT (viewport), "vadjustment");
 516 }
 517
 518 static void
 519 gtk_viewport_set_scroll_adjustments (GtkViewport      *viewport,
 520                                      GtkAdjustment    *hadjustment,
 521                                      GtkAdjustment    *vadjustment)
 522 {
 523   gtk_viewport_set_hadjustment (viewport, hadjustment);
 524   gtk_viewport_set_vadjustment (viewport, vadjustment);
 525 }
 526
 527 /**
 528  * gtk_viewport_set_shadow_type:
 529  * @viewport: a #GtkViewport.
 530  * @type: the new shadow type.
 531  *
 532  * Sets the shadow type of the viewport.
 533  **/
 534 void
 535 gtk_viewport_set_shadow_type (GtkViewport   *viewport,
 536                               GtkShadowType  type)
 537 {
 538   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 539
 540   if ((GtkShadowType) viewport->shadow_type != type)
 541     {
 542       viewport->shadow_type = type;
 543
 544       if (gtk_widget_get_visible (GTK_WIDGET (viewport)))
 545         {
 546           gtk_widget_size_allocate (GTK_WIDGET (viewport), &(GTK_WIDGET (viewport)->allocation));
 547           gtk_widget_queue_draw (GTK_WIDGET (viewport));
 548         }
 549
 550       g_object_notify (G_OBJECT (viewport), "shadow-type");
 551     }
 552 }
 553
 554 /**
 555  * gtk_viewport_get_shadow_type:
 556  * @viewport: a #GtkViewport
 557  *
 558  * Gets the shadow type of the #GtkViewport. See
 559  * gtk_viewport_set_shadow_type().
 560
 561  * Return value: the shadow type
 562  **/
 563 GtkShadowType
 564 gtk_viewport_get_shadow_type (GtkViewport *viewport)
 565 {
 566   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), GTK_SHADOW_NONE);
 567
 568   return viewport->shadow_type;
 569 }
 570
 571 /**
 572  * gtk_viewport_get_bin_window:
 573  * @viewport: a #GtkViewport
 574  *
 575  * Gets the bin window of the #GtkViewport.
 576  *
 577  * Return value: a #GdkWindow
 578  *
 579  * Since: 2.20
 580  **/
 581 GdkWindow*
 582 gtk_viewport_get_bin_window (GtkViewport *viewport)
 583 {
 584   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 585
 586   return viewport->bin_window;
 587 }
 588
 589 static void
 590 gtk_viewport_realize (GtkWidget *widget)
 591 {
 592   GtkViewport *viewport = GTK_VIEWPORT (widget);
 593   GtkBin *bin = GTK_BIN (widget);
 594   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 595   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 596   gint border_width = GTK_CONTAINER (widget)->border_width;
 597
 598   GtkAllocation view_allocation;
 599   GdkWindowAttr attributes;
 600   gint attributes_mask;
 601   gint event_mask;
 602
 603   gtk_widget_set_realized (widget, TRUE);
 604
 605   attributes.x = widget->allocation.x + border_width;
 606   attributes.y = widget->allocation.y + border_width;
 607   attributes.width = widget->allocation.width - border_width * 2;
 608   attributes.height = widget->allocation.height - border_width * 2;
 609   attributes.window_type = GDK_WINDOW_CHILD;
 610   attributes.wclass = GDK_INPUT_OUTPUT;
 611   attributes.visual = gtk_widget_get_visual (widget);
 612   attributes.colormap = gtk_widget_get_colormap (widget);
 613
 614   event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 615   /* We select on button_press_mask so that button 4-5 scrolls are trapped.
 616    */
 617   attributes.event_mask = event_mask | GDK_BUTTON_PRESS_MASK;
 618
 619   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 620
 621   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 622                                    &attributes, attributes_mask);
 623   gdk_window_set_user_data (widget->window, viewport);
 624
 625   viewport_get_view_allocation (viewport, &view_allocation);
 626
 627   attributes.x = view_allocation.x;
 628   attributes.y = view_allocation.y;
 629   attributes.width = view_allocation.width;
 630   attributes.height = view_allocation.height;
 631   attributes.event_mask = 0;
 632
 633   viewport->view_window = gdk_window_new (widget->window, &attributes, attributes_mask);
 634   gdk_window_set_user_data (viewport->view_window, viewport);
 635
 636   gdk_window_set_back_pixmap (viewport->view_window, NULL, FALSE);
 637
 638   attributes.x = - hadjustment->value;
 639   attributes.y = - vadjustment->value;
 640   attributes.width = hadjustment->upper;
 641   attributes.height = vadjustment->upper;
 642
 643   attributes.event_mask = event_mask;
 644
 645   viewport->bin_window = gdk_window_new (viewport->view_window, &attributes, attributes_mask);
 646   gdk_window_set_user_data (viewport->bin_window, viewport);
 647
 648   if (bin->child)
 649     gtk_widget_set_parent_window (bin->child, viewport->bin_window);
 650
 651   widget->style = gtk_style_attach (widget->style, widget->window);
 652   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 653   gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 654
 655   /* Call paint here to allow a theme to set the background without flashing
 656    */
 657   gtk_paint_flat_box(widget->style, viewport->bin_window, GTK_STATE_NORMAL,
 658                      GTK_SHADOW_NONE,
 659                      NULL, widget, "viewportbin",
 660                      0, 0, -1, -1);
 661
 662   gdk_window_show (viewport->bin_window);
 663   gdk_window_show (viewport->view_window);
 664 }
 665
 666 static void
 667 gtk_viewport_unrealize (GtkWidget *widget)
 668 {
 669   GtkViewport *viewport = GTK_VIEWPORT (widget);
 670
 671   gdk_window_set_user_data (viewport->view_window, NULL);
 672   gdk_window_destroy (viewport->view_window);
 673   viewport->view_window = NULL;
 674
 675   gdk_window_set_user_data (viewport->bin_window, NULL);
 676   gdk_window_destroy (viewport->bin_window);
 677   viewport->bin_window = NULL;
 678
 679   GTK_WIDGET_CLASS (gtk_viewport_parent_class)->unrealize (widget);
 680 }
 681
 682 static void
 683 gtk_viewport_paint (GtkWidget    *widget,
 684                     GdkRectangle *area)
 685 {
 686   if (gtk_widget_is_drawable (widget))
 687     {
 688       GtkViewport *viewport = GTK_VIEWPORT (widget);
 689
 690       gtk_paint_shadow (widget->style, widget->window,
 691                         GTK_STATE_NORMAL, viewport->shadow_type,
 692                         area, 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
 703   if (gtk_widget_is_drawable (widget))
 704     {
 705       viewport = GTK_VIEWPORT (widget);
 706
 707       if (event->window == widget->window)
 708         gtk_viewport_paint (widget, &event->area);
 709       else if (event->window == viewport->bin_window)
 710         {
 711           gtk_paint_flat_box(widget->style, viewport->bin_window,
 712                              GTK_STATE_NORMAL, GTK_SHADOW_NONE,
 713                              &event->area, widget, "viewportbin",
 714                              0, 0, -1, -1);
 715
 716           GTK_WIDGET_CLASS (gtk_viewport_parent_class)->expose_event (widget, event);
 717         }
 718     }
 719
 720   return FALSE;
 721 }
 722
 723 static void
 724 gtk_viewport_add (GtkContainer *container,
 725                   GtkWidget    *child)
 726 {
 727   GtkBin *bin = GTK_BIN (container);
 728
 729   g_return_if_fail (bin->child == NULL);
 730
 731   gtk_widget_set_parent_window (child, GTK_VIEWPORT (bin)->bin_window);
 732
 733   GTK_CONTAINER_CLASS (gtk_viewport_parent_class)->add (container, child);
 734 }
 735
 736 static void
 737 gtk_viewport_size_allocate (GtkWidget     *widget,
 738                             GtkAllocation *allocation)
 739 {
 740   GtkViewport *viewport = GTK_VIEWPORT (widget);
 741   GtkBin *bin = GTK_BIN (widget);
 742   gint border_width = GTK_CONTAINER (widget)->border_width;
 743   gboolean hadjustment_value_changed, vadjustment_value_changed;
 744   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 745   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 746   GtkAllocation child_allocation;
 747
 748   /* If our size changed, and we have a shadow, queue a redraw on widget->window to
 749    * redraw the shadow correctly.
 750    */
 751   if (gtk_widget_get_mapped (widget) &&
 752       viewport->shadow_type != GTK_SHADOW_NONE &&
 753       (widget->allocation.width != allocation->width ||
 754        widget->allocation.height != allocation->height))
 755     gdk_window_invalidate_rect (widget->window, NULL, FALSE);
 756
 757   widget->allocation = *allocation;
 758
 759   viewport_set_hadjustment_values (viewport, &hadjustment_value_changed);
 760   viewport_set_vadjustment_values (viewport, &vadjustment_value_changed);
 761
 762   child_allocation.x = 0;
 763   child_allocation.y = 0;
 764   child_allocation.width = hadjustment->upper;
 765   child_allocation.height = vadjustment->upper;
 766   if (gtk_widget_get_realized (widget))
 767     {
 768       GtkAllocation view_allocation;
 769       gdk_window_move_resize (widget->window,
 770                               allocation->x + border_width,
 771                               allocation->y + border_width,
 772                               allocation->width - border_width * 2,
 773                               allocation->height - border_width * 2);
 774
 775       viewport_get_view_allocation (viewport, &view_allocation);
 776       gdk_window_move_resize (viewport->view_window,
 777                               view_allocation.x,
 778                               view_allocation.y,
 779                               view_allocation.width,
 780                               view_allocation.height);
 781       gdk_window_move_resize (viewport->bin_window,
 782                               - hadjustment->value,
 783                               - vadjustment->value,
 784                               child_allocation.width,
 785                               child_allocation.height);
 786     }
 787   if (bin->child && gtk_widget_get_visible (bin->child))
 788     gtk_widget_size_allocate (bin->child, &child_allocation);
 789
 790   gtk_adjustment_changed (hadjustment);
 791   gtk_adjustment_changed (vadjustment);
 792   if (hadjustment_value_changed)
 793     gtk_adjustment_value_changed (hadjustment);
 794   if (vadjustment_value_changed)
 795     gtk_adjustment_value_changed (vadjustment);
 796 }
 797
 798 static void
 799 gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
 800                                        gpointer       data)
 801 {
 802   GtkViewport *viewport = GTK_VIEWPORT (data);
 803   GtkBin *bin = GTK_BIN (data);
 804
 805   if (bin->child && gtk_widget_get_visible (bin->child) &&
 806       gtk_widget_get_realized (GTK_WIDGET (viewport)))
 807     {
 808       GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 809       GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 810       gint old_x, old_y;
 811       gint new_x, new_y;
 812
 813       gdk_window_get_position (viewport->bin_window, &old_x, &old_y);
 814       new_x = - hadjustment->value;
 815       new_y = - vadjustment->value;
 816
 817       if (new_x != old_x || new_y != old_y)
 818         {
 819           gdk_window_move (viewport->bin_window, new_x, new_y);
 820           gdk_window_process_updates (viewport->bin_window, TRUE);
 821         }
 822     }
 823 }
 824
 825 static void
 826 gtk_viewport_style_set (GtkWidget *widget,
 827                         GtkStyle  *previous_style)
 828 {
 829    if (gtk_widget_get_realized (widget) &&
 830        gtk_widget_get_has_window (widget))
 831      {
 832         GtkViewport *viewport = GTK_VIEWPORT (widget);
 833
 834         gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 835         gtk_style_set_background (widget->style, widget->window, widget->state);
 836      }
 837 }
 838
 839
 840 static void
 841 gtk_viewport_extended_layout_init (GtkExtendedLayoutIface *iface)
 842 {
 843   iface->get_desired_width  = gtk_viewport_get_desired_width;
 844   iface->get_desired_height = gtk_viewport_get_desired_height;
 845 }
 846
 847 static void
 848 gtk_viewport_get_desired_size (GtkExtendedLayout *layout,
 849                                GtkOrientation     orientation,
 850                                gint              *minimum_size,
 851                                gint              *natural_size)
 852 {
 853   GtkWidget *child;
 854   gint       child_min, child_nat;
 855   gint       minimum, natural;
 856
 857   child = gtk_bin_get_child (GTK_BIN (layout));
 858
 859   /* XXX This should probably be (border_width * 2); but GTK+ has
 860    * been doing this with a single border for a while now...
 861    */
 862   minimum = GTK_CONTAINER (layout)->border_width;
 863
 864   if (GTK_VIEWPORT (layout)->shadow_type != GTK_SHADOW_NONE)
 865     {
 866       if (orientation == GTK_ORIENTATION_HORIZONTAL)
 867           minimum += 2 * GTK_WIDGET (layout)->style->xthickness;
 868       else
 869           minimum += 2 * GTK_WIDGET (layout)->style->ythickness;
 870     }
 871
 872   natural = minimum;
 873
 874   if (child && gtk_widget_get_visible (child))
 875     {
 876       if (orientation == GTK_ORIENTATION_HORIZONTAL)
 877         gtk_extended_layout_get_desired_width (GTK_EXTENDED_LAYOUT (child), &child_min, &child_nat);
 878       else
 879         gtk_extended_layout_get_desired_height (GTK_EXTENDED_LAYOUT (child), &child_min, &child_nat);
 880
 881       minimum += child_min;
 882       natural += child_nat;
 883     }
 884
 885   if (minimum_size)
 886     *minimum_size = minimum;
 887
 888   if (natural_size)
 889     *natural_size = natural;
 890 }
 891
 892 static void
 893 gtk_viewport_get_desired_width (GtkExtendedLayout *layout,
 894                                 gint              *minimum_size,
 895                                 gint              *natural_size)
 896 {
 897   gtk_viewport_get_desired_size (layout, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
 898 }
 899
 900 static void
 901 gtk_viewport_get_desired_height (GtkExtendedLayout *layout,
 902                                  gint              *minimum_size,
 903                                  gint              *natural_size)
 904 {
 905   gtk_viewport_get_desired_size (layout, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
 906 }
 907
 908 #define __GTK_VIEWPORT_C__
 909 #include "gtkaliasdef.c"