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 /**
  36  * SECTION:gtkviewport
  37  * @Short_description: An adapter which makes widgets scrollable
  38  * @Title: GtkViewport
  39  * @See_also:#GtkScrolledWindow, #GtkAdjustment
  40  *
  41  * The #GtkViewport widget acts as an adaptor class, implementing
  42  * scrollability for child widgets that lack their own scrolling
  43  * capabilities. Use #GtkViewport to scroll child widgets such as
  44  * #GtkTable, #GtkBox, and so on.
  45  *
  46  * If a widget has native scrolling abilities, such as #GtkTextView,
  47  * #GtkTreeView or #GtkIconview, it can be added to a #GtkScrolledWindow
  48  * with gtk_container_add(). If a widget does not, you must first add the
  49  * widget to a #GtkViewport, then add the viewport to the scrolled window.
  50  * The convenience function gtk_scrolled_window_add_with_viewport() does
  51  * exactly this, so you can ignore the presence of the viewport.
  52  */
  53
  54 enum {
  55   PROP_0,
  56   PROP_HADJUSTMENT,
  57   PROP_VADJUSTMENT,
  58   PROP_SHADOW_TYPE
  59 };
  60
  61
  62 static void gtk_viewport_finalize                 (GObject          *object);
  63 static void gtk_viewport_destroy                  (GtkObject        *object);
  64 static void gtk_viewport_set_property             (GObject         *object,
  65                                                    guint            prop_id,
  66                                                    const GValue    *value,
  67                                                    GParamSpec      *pspec);
  68 static void gtk_viewport_get_property             (GObject         *object,
  69                                                    guint            prop_id,
  70                                                    GValue          *value,
  71                                                    GParamSpec      *pspec);
  72 static void gtk_viewport_set_scroll_adjustments   (GtkViewport      *viewport,
  73                                                    GtkAdjustment    *hadjustment,
  74                                                    GtkAdjustment    *vadjustment);
  75 static void gtk_viewport_realize                  (GtkWidget        *widget);
  76 static void gtk_viewport_unrealize                (GtkWidget        *widget);
  77 static void gtk_viewport_paint                    (GtkWidget        *widget,
  78                                                    GdkRectangle     *area);
  79 static gint gtk_viewport_expose                   (GtkWidget        *widget,
  80                                                    GdkEventExpose   *event);
  81 static void gtk_viewport_add                      (GtkContainer     *container,
  82                                                    GtkWidget        *widget);
  83 static void gtk_viewport_size_allocate            (GtkWidget        *widget,
  84                                                    GtkAllocation    *allocation);
  85 static void gtk_viewport_adjustment_value_changed (GtkAdjustment    *adjustment,
  86                                                    gpointer          data);
  87 static void gtk_viewport_style_set                (GtkWidget *widget,
  88                                                    GtkStyle  *previous_style);
  89
  90 static void gtk_viewport_extended_layout_init     (GtkExtendedLayoutIface *iface);
  91 static void gtk_viewport_get_desired_width        (GtkExtendedLayout       *layout,
  92                                                    gint                    *minimum_size,
  93                                                    gint                    *natural_size);
  94 static void gtk_viewport_get_desired_height       (GtkExtendedLayout       *layout,
  95                                                    gint                    *minimum_size,
  96                                                    gint                    *natural_size);
  97
  98
  99 G_DEFINE_TYPE_WITH_CODE (GtkViewport, gtk_viewport, GTK_TYPE_BIN,
 100                          G_IMPLEMENT_INTERFACE (GTK_TYPE_EXTENDED_LAYOUT,
 101                                                 gtk_viewport_extended_layout_init))
 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   gobject_class->finalize = gtk_viewport_finalize;
 117   gobject_class->set_property = gtk_viewport_set_property;
 118   gobject_class->get_property = gtk_viewport_get_property;
 119   object_class->destroy = gtk_viewport_destroy;
 120
 121   widget_class->realize = gtk_viewport_realize;
 122   widget_class->unrealize = gtk_viewport_unrealize;
 123   widget_class->expose_event = gtk_viewport_expose;
 124   widget_class->size_allocate = gtk_viewport_size_allocate;
 125   widget_class->style_set = gtk_viewport_style_set;
 126
 127   container_class->add = gtk_viewport_add;
 128
 129   class->set_scroll_adjustments = gtk_viewport_set_scroll_adjustments;
 130
 131   g_object_class_install_property (gobject_class,
 132                                    PROP_HADJUSTMENT,
 133                                    g_param_spec_object ("hadjustment",
 134                                                         P_("Horizontal adjustment"),
 135                                                         P_("The GtkAdjustment that determines the values of the horizontal position for this viewport"),
 136                                                         GTK_TYPE_ADJUSTMENT,
 137                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 138
 139   g_object_class_install_property (gobject_class,
 140                                    PROP_VADJUSTMENT,
 141                                    g_param_spec_object ("vadjustment",
 142                                                         P_("Vertical adjustment"),
 143                                                         P_("The GtkAdjustment that determines the values of the vertical position for this viewport"),
 144                                                         GTK_TYPE_ADJUSTMENT,
 145                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 146
 147   g_object_class_install_property (gobject_class,
 148                                    PROP_SHADOW_TYPE,
 149                                    g_param_spec_enum ("shadow-type",
 150                                                       P_("Shadow type"),
 151                                                       P_("Determines how the shadowed box around the viewport is drawn"),
 152                                                       GTK_TYPE_SHADOW_TYPE,
 153                                                       GTK_SHADOW_IN,
 154                                                       GTK_PARAM_READWRITE));
 155
 156   /**
 157    * GtkViewport::set-scroll-adjustments
 158    * @horizontal: the horizontal #GtkAdjustment
 159    * @vertical: the vertical #GtkAdjustment
 160    *
 161    * Set the scroll adjustments for the viewport. Usually scrolled containers
 162    * like #GtkScrolledWindow will emit this signal to connect two instances
 163    * of #GtkScrollbar to the scroll directions of the #GtkViewport.
 164    */
 165   widget_class->set_scroll_adjustments_signal =
 166     g_signal_new (I_("set-scroll-adjustments"),
 167                   G_OBJECT_CLASS_TYPE (gobject_class),
 168                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 169                   G_STRUCT_OFFSET (GtkViewportClass, set_scroll_adjustments),
 170                   NULL, NULL,
 171                   _gtk_marshal_VOID__OBJECT_OBJECT,
 172                   G_TYPE_NONE, 2,
 173                   GTK_TYPE_ADJUSTMENT,
 174                   GTK_TYPE_ADJUSTMENT);
 175 }
 176
 177 static void
 178 gtk_viewport_set_property (GObject         *object,
 179                            guint            prop_id,
 180                            const GValue    *value,
 181                            GParamSpec      *pspec)
 182 {
 183   GtkViewport *viewport;
 184
 185   viewport = GTK_VIEWPORT (object);
 186
 187   switch (prop_id)
 188     {
 189     case PROP_HADJUSTMENT:
 190       gtk_viewport_set_hadjustment (viewport, g_value_get_object (value));
 191       break;
 192     case PROP_VADJUSTMENT:
 193       gtk_viewport_set_vadjustment (viewport, g_value_get_object (value));
 194       break;
 195     case PROP_SHADOW_TYPE:
 196       gtk_viewport_set_shadow_type (viewport, g_value_get_enum (value));
 197       break;
 198     default:
 199       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 200       break;
 201     }
 202 }
 203
 204 static void
 205 gtk_viewport_get_property (GObject         *object,
 206                            guint            prop_id,
 207                            GValue          *value,
 208                            GParamSpec      *pspec)
 209 {
 210   GtkViewport *viewport;
 211
 212   viewport = GTK_VIEWPORT (object);
 213
 214   switch (prop_id)
 215     {
 216     case PROP_HADJUSTMENT:
 217       g_value_set_object (value, viewport->hadjustment);
 218       break;
 219     case PROP_VADJUSTMENT:
 220       g_value_set_object (value, viewport->vadjustment);
 221       break;
 222     case PROP_SHADOW_TYPE:
 223       g_value_set_enum (value, viewport->shadow_type);
 224       break;
 225     default:
 226       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 227       break;
 228     }
 229 }
 230
 231 static void
 232 gtk_viewport_init (GtkViewport *viewport)
 233 {
 234   gtk_widget_set_has_window (GTK_WIDGET (viewport), TRUE);
 235
 236   gtk_widget_set_redraw_on_allocate (GTK_WIDGET (viewport), FALSE);
 237   gtk_container_set_resize_mode (GTK_CONTAINER (viewport), GTK_RESIZE_QUEUE);
 238
 239   viewport->shadow_type = GTK_SHADOW_IN;
 240   viewport->view_window = NULL;
 241   viewport->bin_window = NULL;
 242   viewport->hadjustment = NULL;
 243   viewport->vadjustment = NULL;
 244 }
 245
 246 /**
 247  * gtk_viewport_new:
 248  * @hadjustment: horizontal adjustment.
 249  * @vadjustment: vertical adjustment.
 250  * @returns: a new #GtkViewport.
 251  *
 252  * Creates a new #GtkViewport with the given adjustments.
 253  *
 254  **/
 255 GtkWidget*
 256 gtk_viewport_new (GtkAdjustment *hadjustment,
 257                   GtkAdjustment *vadjustment)
 258 {
 259   GtkWidget *viewport;
 260
 261   viewport = g_object_new (GTK_TYPE_VIEWPORT,
 262                              "hadjustment", hadjustment,
 263                              "vadjustment", vadjustment,
 264                              NULL);
 265
 266   return viewport;
 267 }
 268
 269 #define ADJUSTMENT_POINTER(viewport, orientation)         \
 270   (((orientation) == GTK_ORIENTATION_HORIZONTAL) ?        \
 271      &(viewport)->hadjustment : &(viewport)->vadjustment)
 272
 273 static void
 274 viewport_disconnect_adjustment (GtkViewport    *viewport,
 275                                 GtkOrientation  orientation)
 276 {
 277   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 278
 279   if (*adjustmentp)
 280     {
 281       g_signal_handlers_disconnect_by_func (*adjustmentp,
 282                                             gtk_viewport_adjustment_value_changed,
 283                                             viewport);
 284       g_object_unref (*adjustmentp);
 285       *adjustmentp = NULL;
 286     }
 287 }
 288
 289 static void
 290 gtk_viewport_finalize (GObject *object)
 291 {
 292   GtkViewport *viewport = GTK_VIEWPORT (object);
 293
 294   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
 295   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
 296
 297   G_OBJECT_CLASS (gtk_viewport_parent_class)->finalize (object);
 298 }
 299
 300 static void
 301 gtk_viewport_destroy (GtkObject *object)
 302 {
 303   GtkViewport *viewport = GTK_VIEWPORT (object);
 304
 305   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
 306   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
 307
 308   GTK_OBJECT_CLASS (gtk_viewport_parent_class)->destroy (object);
 309 }
 310
 311 /**
 312  * gtk_viewport_get_hadjustment:
 313  * @viewport: a #GtkViewport.
 314  *
 315  * Returns the horizontal adjustment of the viewport.
 316  *
 317  * Return value: the horizontal adjustment of @viewport.
 318  **/
 319 GtkAdjustment*
 320 gtk_viewport_get_hadjustment (GtkViewport *viewport)
 321 {
 322   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 323
 324   if (!viewport->hadjustment)
 325     gtk_viewport_set_hadjustment (viewport, NULL);
 326
 327   return viewport->hadjustment;
 328 }
 329
 330 /**
 331  * gtk_viewport_get_vadjustment:
 332  * @viewport: a #GtkViewport.
 333  *
 334  * Returns the vertical adjustment of the viewport.
 335  *
 336  * Return value: the vertical adjustment of @viewport.
 337  **/
 338 GtkAdjustment*
 339 gtk_viewport_get_vadjustment (GtkViewport *viewport)
 340 {
 341   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 342
 343   if (!viewport->vadjustment)
 344     gtk_viewport_set_vadjustment (viewport, NULL);
 345
 346   return viewport->vadjustment;
 347 }
 348
 349 static void
 350 viewport_get_view_allocation (GtkViewport   *viewport,
 351                               GtkAllocation *view_allocation)
 352 {
 353   GtkWidget *widget = GTK_WIDGET (viewport);
 354   GtkAllocation *allocation = &widget->allocation;
 355   gint border_width = GTK_CONTAINER (viewport)->border_width;
 356
 357   view_allocation->x = 0;
 358   view_allocation->y = 0;
 359
 360   if (viewport->shadow_type != GTK_SHADOW_NONE)
 361     {
 362       view_allocation->x = widget->style->xthickness;
 363       view_allocation->y = widget->style->ythickness;
 364     }
 365
 366   view_allocation->width = MAX (1, allocation->width - view_allocation->x * 2 - border_width * 2);
 367   view_allocation->height = MAX (1, allocation->height - view_allocation->y * 2 - border_width * 2);
 368 }
 369
 370 static void
 371 viewport_reclamp_adjustment (GtkAdjustment *adjustment,
 372                              gboolean      *value_changed)
 373 {
 374   gdouble value = adjustment->value;
 375
 376   value = CLAMP (value, 0, adjustment->upper - adjustment->page_size);
 377   if (value != adjustment->value)
 378     {
 379       adjustment->value = value;
 380       if (value_changed)
 381         *value_changed = TRUE;
 382     }
 383   else if (value_changed)
 384     *value_changed = FALSE;
 385 }
 386
 387 static void
 388 viewport_set_hadjustment_values (GtkViewport *viewport,
 389                                  gboolean    *value_changed)
 390 {
 391   GtkBin *bin = GTK_BIN (viewport);
 392   GtkAllocation view_allocation;
 393   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 394   gdouble old_page_size;
 395   gdouble old_upper;
 396   gdouble old_value;
 397
 398   viewport_get_view_allocation (viewport, &view_allocation);
 399
 400   old_page_size = hadjustment->page_size;
 401   old_upper = hadjustment->upper;
 402   old_value = hadjustment->value;
 403   hadjustment->page_size = view_allocation.width;
 404   hadjustment->step_increment = view_allocation.width * 0.1;
 405   hadjustment->page_increment = view_allocation.width * 0.9;
 406
 407   hadjustment->lower = 0;
 408
 409   if (bin->child && gtk_widget_get_visible (bin->child))
 410     {
 411       GtkRequisition child_requisition;
 412
 413       gtk_widget_get_child_requisition (bin->child, &child_requisition);
 414       hadjustment->upper = MAX (child_requisition.width, view_allocation.width);
 415     }
 416   else
 417     hadjustment->upper = view_allocation.width;
 418
 419   if (gtk_widget_get_direction (GTK_WIDGET (viewport)) == GTK_TEXT_DIR_RTL)
 420     {
 421       gdouble dist = old_upper - (old_value + old_page_size);
 422       hadjustment->value = hadjustment->upper - dist - hadjustment->page_size;
 423       viewport_reclamp_adjustment (hadjustment, value_changed);
 424       *value_changed = (old_value != hadjustment->value);
 425     }
 426   else
 427     viewport_reclamp_adjustment (hadjustment, value_changed);
 428 }
 429
 430 static void
 431 viewport_set_vadjustment_values (GtkViewport *viewport,
 432                                  gboolean    *value_changed)
 433 {
 434   GtkBin *bin = GTK_BIN (viewport);
 435   GtkAllocation view_allocation;
 436   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 437
 438   viewport_get_view_allocation (viewport, &view_allocation);
 439
 440   vadjustment->page_size = view_allocation.height;
 441   vadjustment->step_increment = view_allocation.height * 0.1;
 442   vadjustment->page_increment = view_allocation.height * 0.9;
 443
 444   vadjustment->lower = 0;
 445
 446   if (bin->child && gtk_widget_get_visible (bin->child))
 447     {
 448       gint natural_height;
 449
 450       gtk_extended_layout_get_height_for_width (GTK_EXTENDED_LAYOUT (bin->child),
 451                                                 view_allocation.width,
 452                                                 NULL,
 453                                                 &natural_height);
 454       vadjustment->upper = MAX (natural_height, view_allocation.height);
 455     }
 456   else
 457     vadjustment->upper = view_allocation.height;
 458
 459   viewport_reclamp_adjustment (vadjustment, value_changed);
 460 }
 461
 462 static void
 463 viewport_set_adjustment (GtkViewport    *viewport,
 464                          GtkOrientation  orientation,
 465                          GtkAdjustment  *adjustment)
 466 {
 467   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 468   gboolean value_changed;
 469
 470   if (adjustment && adjustment == *adjustmentp)
 471     return;
 472
 473   if (!adjustment)
 474     adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
 475                                                      0.0, 0.0, 0.0));
 476   viewport_disconnect_adjustment (viewport, orientation);
 477   *adjustmentp = adjustment;
 478   g_object_ref_sink (adjustment);
 479
 480   if (orientation == GTK_ORIENTATION_HORIZONTAL)
 481     viewport_set_hadjustment_values (viewport, &value_changed);
 482   else
 483     viewport_set_vadjustment_values (viewport, &value_changed);
 484
 485   g_signal_connect (adjustment, "value-changed",
 486                     G_CALLBACK (gtk_viewport_adjustment_value_changed),
 487                     viewport);
 488
 489   gtk_adjustment_changed (adjustment);
 490
 491   if (value_changed)
 492     gtk_adjustment_value_changed (adjustment);
 493   else
 494     gtk_viewport_adjustment_value_changed (adjustment, viewport);
 495 }
 496
 497 /**
 498  * gtk_viewport_set_hadjustment:
 499  * @viewport: a #GtkViewport.
 500  * @adjustment: (allow-none): a #GtkAdjustment.
 501  *
 502  * Sets the horizontal adjustment of the viewport.
 503  **/
 504 void
 505 gtk_viewport_set_hadjustment (GtkViewport   *viewport,
 506                               GtkAdjustment *adjustment)
 507 {
 508   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 509   if (adjustment)
 510     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 511
 512   viewport_set_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL, adjustment);
 513
 514   g_object_notify (G_OBJECT (viewport), "hadjustment");
 515 }
 516
 517 /**
 518  * gtk_viewport_set_vadjustment:
 519  * @viewport: a #GtkViewport.
 520  * @adjustment: (allow-none): a #GtkAdjustment.
 521  *
 522  * Sets the vertical adjustment of the viewport.
 523  **/
 524 void
 525 gtk_viewport_set_vadjustment (GtkViewport   *viewport,
 526                               GtkAdjustment *adjustment)
 527 {
 528   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 529   if (adjustment)
 530     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 531
 532   viewport_set_adjustment (viewport, GTK_ORIENTATION_VERTICAL, adjustment);
 533
 534   g_object_notify (G_OBJECT (viewport), "vadjustment");
 535 }
 536
 537 static void
 538 gtk_viewport_set_scroll_adjustments (GtkViewport      *viewport,
 539                                      GtkAdjustment    *hadjustment,
 540                                      GtkAdjustment    *vadjustment)
 541 {
 542   gtk_viewport_set_hadjustment (viewport, hadjustment);
 543   gtk_viewport_set_vadjustment (viewport, vadjustment);
 544 }
 545
 546 /**
 547  * gtk_viewport_set_shadow_type:
 548  * @viewport: a #GtkViewport.
 549  * @type: the new shadow type.
 550  *
 551  * Sets the shadow type of the viewport.
 552  **/
 553 void
 554 gtk_viewport_set_shadow_type (GtkViewport   *viewport,
 555                               GtkShadowType  type)
 556 {
 557   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 558
 559   if ((GtkShadowType) viewport->shadow_type != type)
 560     {
 561       viewport->shadow_type = type;
 562
 563       if (gtk_widget_get_visible (GTK_WIDGET (viewport)))
 564         {
 565           gtk_widget_size_allocate (GTK_WIDGET (viewport), &(GTK_WIDGET (viewport)->allocation));
 566           gtk_widget_queue_draw (GTK_WIDGET (viewport));
 567         }
 568
 569       g_object_notify (G_OBJECT (viewport), "shadow-type");
 570     }
 571 }
 572
 573 /**
 574  * gtk_viewport_get_shadow_type:
 575  * @viewport: a #GtkViewport
 576  *
 577  * Gets the shadow type of the #GtkViewport. See
 578  * gtk_viewport_set_shadow_type().
 579
 580  * Return value: the shadow type
 581  **/
 582 GtkShadowType
 583 gtk_viewport_get_shadow_type (GtkViewport *viewport)
 584 {
 585   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), GTK_SHADOW_NONE);
 586
 587   return viewport->shadow_type;
 588 }
 589
 590 /**
 591  * gtk_viewport_get_bin_window:
 592  * @viewport: a #GtkViewport
 593  *
 594  * Gets the bin window of the #GtkViewport.
 595  *
 596  * Return value: a #GdkWindow
 597  *
 598  * Since: 2.20
 599  **/
 600 GdkWindow*
 601 gtk_viewport_get_bin_window (GtkViewport *viewport)
 602 {
 603   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 604
 605   return viewport->bin_window;
 606 }
 607
 608 static void
 609 gtk_viewport_realize (GtkWidget *widget)
 610 {
 611   GtkViewport *viewport = GTK_VIEWPORT (widget);
 612   GtkBin *bin = GTK_BIN (widget);
 613   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 614   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 615   gint border_width = GTK_CONTAINER (widget)->border_width;
 616
 617   GtkAllocation view_allocation;
 618   GdkWindowAttr attributes;
 619   gint attributes_mask;
 620   gint event_mask;
 621
 622   gtk_widget_set_realized (widget, TRUE);
 623
 624   attributes.x = widget->allocation.x + border_width;
 625   attributes.y = widget->allocation.y + border_width;
 626   attributes.width = widget->allocation.width - border_width * 2;
 627   attributes.height = widget->allocation.height - border_width * 2;
 628   attributes.window_type = GDK_WINDOW_CHILD;
 629   attributes.wclass = GDK_INPUT_OUTPUT;
 630   attributes.visual = gtk_widget_get_visual (widget);
 631   attributes.colormap = gtk_widget_get_colormap (widget);
 632
 633   event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 634   /* We select on button_press_mask so that button 4-5 scrolls are trapped.
 635    */
 636   attributes.event_mask = event_mask | GDK_BUTTON_PRESS_MASK;
 637
 638   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 639
 640   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 641                                    &attributes, attributes_mask);
 642   gdk_window_set_user_data (widget->window, viewport);
 643
 644   viewport_get_view_allocation (viewport, &view_allocation);
 645
 646   attributes.x = view_allocation.x;
 647   attributes.y = view_allocation.y;
 648   attributes.width = view_allocation.width;
 649   attributes.height = view_allocation.height;
 650   attributes.event_mask = 0;
 651
 652   viewport->view_window = gdk_window_new (widget->window, &attributes, attributes_mask);
 653   gdk_window_set_user_data (viewport->view_window, viewport);
 654
 655   gdk_window_set_back_pixmap (viewport->view_window, NULL, FALSE);
 656
 657   attributes.x = - hadjustment->value;
 658   attributes.y = - vadjustment->value;
 659   attributes.width = hadjustment->upper;
 660   attributes.height = vadjustment->upper;
 661
 662   attributes.event_mask = event_mask;
 663
 664   viewport->bin_window = gdk_window_new (viewport->view_window, &attributes, attributes_mask);
 665   gdk_window_set_user_data (viewport->bin_window, viewport);
 666
 667   if (bin->child)
 668     gtk_widget_set_parent_window (bin->child, viewport->bin_window);
 669
 670   widget->style = gtk_style_attach (widget->style, widget->window);
 671   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 672   gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 673
 674   /* Call paint here to allow a theme to set the background without flashing
 675    */
 676   gtk_paint_flat_box(widget->style, viewport->bin_window, GTK_STATE_NORMAL,
 677                      GTK_SHADOW_NONE,
 678                      NULL, widget, "viewportbin",
 679                      0, 0, -1, -1);
 680
 681   gdk_window_show (viewport->bin_window);
 682   gdk_window_show (viewport->view_window);
 683 }
 684
 685 static void
 686 gtk_viewport_unrealize (GtkWidget *widget)
 687 {
 688   GtkViewport *viewport = GTK_VIEWPORT (widget);
 689
 690   gdk_window_set_user_data (viewport->view_window, NULL);
 691   gdk_window_destroy (viewport->view_window);
 692   viewport->view_window = NULL;
 693
 694   gdk_window_set_user_data (viewport->bin_window, NULL);
 695   gdk_window_destroy (viewport->bin_window);
 696   viewport->bin_window = NULL;
 697
 698   GTK_WIDGET_CLASS (gtk_viewport_parent_class)->unrealize (widget);
 699 }
 700
 701 static void
 702 gtk_viewport_paint (GtkWidget    *widget,
 703                     GdkRectangle *area)
 704 {
 705   if (gtk_widget_is_drawable (widget))
 706     {
 707       GtkViewport *viewport = GTK_VIEWPORT (widget);
 708
 709       gtk_paint_shadow (widget->style, widget->window,
 710                         GTK_STATE_NORMAL, viewport->shadow_type,
 711                         area, widget, "viewport",
 712                         0, 0, -1, -1);
 713     }
 714 }
 715
 716 static gint
 717 gtk_viewport_expose (GtkWidget      *widget,
 718                      GdkEventExpose *event)
 719 {
 720   GtkViewport *viewport;
 721
 722   if (gtk_widget_is_drawable (widget))
 723     {
 724       viewport = GTK_VIEWPORT (widget);
 725
 726       if (event->window == widget->window)
 727         gtk_viewport_paint (widget, &event->area);
 728       else if (event->window == viewport->bin_window)
 729         {
 730           gtk_paint_flat_box(widget->style, viewport->bin_window,
 731                              GTK_STATE_NORMAL, GTK_SHADOW_NONE,
 732                              &event->area, widget, "viewportbin",
 733                              0, 0, -1, -1);
 734
 735           GTK_WIDGET_CLASS (gtk_viewport_parent_class)->expose_event (widget, event);
 736         }
 737     }
 738
 739   return FALSE;
 740 }
 741
 742 static void
 743 gtk_viewport_add (GtkContainer *container,
 744                   GtkWidget    *child)
 745 {
 746   GtkBin *bin = GTK_BIN (container);
 747
 748   g_return_if_fail (bin->child == NULL);
 749
 750   gtk_widget_set_parent_window (child, GTK_VIEWPORT (bin)->bin_window);
 751
 752   GTK_CONTAINER_CLASS (gtk_viewport_parent_class)->add (container, child);
 753 }
 754
 755 static void
 756 gtk_viewport_size_allocate (GtkWidget     *widget,
 757                             GtkAllocation *allocation)
 758 {
 759   GtkViewport *viewport = GTK_VIEWPORT (widget);
 760   GtkBin *bin = GTK_BIN (widget);
 761   gint border_width = GTK_CONTAINER (widget)->border_width;
 762   gboolean hadjustment_value_changed, vadjustment_value_changed;
 763   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 764   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 765   GtkAllocation child_allocation;
 766
 767   /* If our size changed, and we have a shadow, queue a redraw on widget->window to
 768    * redraw the shadow correctly.
 769    */
 770   if (gtk_widget_get_mapped (widget) &&
 771       viewport->shadow_type != GTK_SHADOW_NONE &&
 772       (widget->allocation.width != allocation->width ||
 773        widget->allocation.height != allocation->height))
 774     gdk_window_invalidate_rect (widget->window, NULL, FALSE);
 775
 776   widget->allocation = *allocation;
 777
 778   viewport_set_hadjustment_values (viewport, &hadjustment_value_changed);
 779   viewport_set_vadjustment_values (viewport, &vadjustment_value_changed);
 780
 781   child_allocation.x = 0;
 782   child_allocation.y = 0;
 783   child_allocation.width = hadjustment->upper;
 784   child_allocation.height = vadjustment->upper;
 785   if (gtk_widget_get_realized (widget))
 786     {
 787       GtkAllocation view_allocation;
 788       gdk_window_move_resize (widget->window,
 789                               allocation->x + border_width,
 790                               allocation->y + border_width,
 791                               allocation->width - border_width * 2,
 792                               allocation->height - border_width * 2);
 793
 794       viewport_get_view_allocation (viewport, &view_allocation);
 795       gdk_window_move_resize (viewport->view_window,
 796                               view_allocation.x,
 797                               view_allocation.y,
 798                               view_allocation.width,
 799                               view_allocation.height);
 800       gdk_window_move_resize (viewport->bin_window,
 801                               - hadjustment->value,
 802                               - vadjustment->value,
 803                               child_allocation.width,
 804                               child_allocation.height);
 805     }
 806   if (bin->child && gtk_widget_get_visible (bin->child))
 807     gtk_widget_size_allocate (bin->child, &child_allocation);
 808
 809   gtk_adjustment_changed (hadjustment);
 810   gtk_adjustment_changed (vadjustment);
 811   if (hadjustment_value_changed)
 812     gtk_adjustment_value_changed (hadjustment);
 813   if (vadjustment_value_changed)
 814     gtk_adjustment_value_changed (vadjustment);
 815 }
 816
 817 static void
 818 gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
 819                                        gpointer       data)
 820 {
 821   GtkViewport *viewport = GTK_VIEWPORT (data);
 822   GtkBin *bin = GTK_BIN (data);
 823
 824   if (bin->child && gtk_widget_get_visible (bin->child) &&
 825       gtk_widget_get_realized (GTK_WIDGET (viewport)))
 826     {
 827       GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 828       GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 829       gint old_x, old_y;
 830       gint new_x, new_y;
 831
 832       gdk_window_get_position (viewport->bin_window, &old_x, &old_y);
 833       new_x = - hadjustment->value;
 834       new_y = - vadjustment->value;
 835
 836       if (new_x != old_x || new_y != old_y)
 837         {
 838           gdk_window_move (viewport->bin_window, new_x, new_y);
 839           gdk_window_process_updates (viewport->bin_window, TRUE);
 840         }
 841     }
 842 }
 843
 844 static void
 845 gtk_viewport_style_set (GtkWidget *widget,
 846                         GtkStyle  *previous_style)
 847 {
 848    if (gtk_widget_get_realized (widget) &&
 849        gtk_widget_get_has_window (widget))
 850      {
 851         GtkViewport *viewport = GTK_VIEWPORT (widget);
 852
 853         gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 854         gtk_style_set_background (widget->style, widget->window, widget->state);
 855      }
 856 }
 857
 858
 859 static void
 860 gtk_viewport_extended_layout_init (GtkExtendedLayoutIface *iface)
 861 {
 862   iface->get_desired_width  = gtk_viewport_get_desired_width;
 863   iface->get_desired_height = gtk_viewport_get_desired_height;
 864 }
 865
 866 static void
 867 gtk_viewport_get_desired_size (GtkExtendedLayout *layout,
 868                                GtkOrientation     orientation,
 869                                gint              *minimum_size,
 870                                gint              *natural_size)
 871 {
 872   GtkWidget *child;
 873   gint       child_min, child_nat;
 874   gint       minimum, natural;
 875
 876   child = gtk_bin_get_child (GTK_BIN (layout));
 877
 878   /* XXX This should probably be (border_width * 2); but GTK+ has
 879    * been doing this with a single border for a while now...
 880    */
 881   minimum = GTK_CONTAINER (layout)->border_width;
 882
 883   if (GTK_VIEWPORT (layout)->shadow_type != GTK_SHADOW_NONE)
 884     {
 885       if (orientation == GTK_ORIENTATION_HORIZONTAL)
 886           minimum += 2 * GTK_WIDGET (layout)->style->xthickness;
 887       else
 888           minimum += 2 * GTK_WIDGET (layout)->style->ythickness;
 889     }
 890
 891   natural = minimum;
 892
 893   if (child && gtk_widget_get_visible (child))
 894     {
 895       if (orientation == GTK_ORIENTATION_HORIZONTAL)
 896         gtk_extended_layout_get_desired_width (GTK_EXTENDED_LAYOUT (child), &child_min, &child_nat);
 897       else
 898         gtk_extended_layout_get_desired_height (GTK_EXTENDED_LAYOUT (child), &child_min, &child_nat);
 899
 900       minimum += child_min;
 901       natural += child_nat;
 902     }
 903
 904   if (minimum_size)
 905     *minimum_size = minimum;
 906
 907   if (natural_size)
 908     *natural_size = natural;
 909 }
 910
 911 static void
 912 gtk_viewport_get_desired_width (GtkExtendedLayout *layout,
 913                                 gint              *minimum_size,
 914                                 gint              *natural_size)
 915 {
 916   gtk_viewport_get_desired_size (layout, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
 917 }
 918
 919 static void
 920 gtk_viewport_get_desired_height (GtkExtendedLayout *layout,
 921                                  gint              *minimum_size,
 922                                  gint              *natural_size)
 923 {
 924   gtk_viewport_get_desired_size (layout, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
 925 }
 926
 927 #define __GTK_VIEWPORT_C__
 928 #include "gtkaliasdef.c"