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 "gtksizerequest.h"
  30 #include "gtkintl.h"
  31 #include "gtkmarshalers.h"
  32 #include "gtkprivate.h"
  33
  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 struct _GtkViewportPrivate
  55 {
  56   GtkAdjustment  *hadjustment;
  57   GtkAdjustment  *vadjustment;
  58   GtkShadowType   shadow_type;
  59
  60   GdkWindow      *bin_window;
  61   GdkWindow      *view_window;
  62 };
  63
  64 enum {
  65   PROP_0,
  66   PROP_HADJUSTMENT,
  67   PROP_VADJUSTMENT,
  68   PROP_SHADOW_TYPE
  69 };
  70
  71
  72 static void gtk_viewport_finalize                 (GObject          *object);
  73 static void gtk_viewport_destroy                  (GtkObject        *object);
  74 static void gtk_viewport_set_property             (GObject         *object,
  75                                                    guint            prop_id,
  76                                                    const GValue    *value,
  77                                                    GParamSpec      *pspec);
  78 static void gtk_viewport_get_property             (GObject         *object,
  79                                                    guint            prop_id,
  80                                                    GValue          *value,
  81                                                    GParamSpec      *pspec);
  82 static void gtk_viewport_set_scroll_adjustments   (GtkViewport      *viewport,
  83                                                    GtkAdjustment    *hadjustment,
  84                                                    GtkAdjustment    *vadjustment);
  85 static void gtk_viewport_realize                  (GtkWidget        *widget);
  86 static void gtk_viewport_unrealize                (GtkWidget        *widget);
  87 static void gtk_viewport_paint                    (GtkWidget        *widget,
  88                                                    GdkRectangle     *area);
  89 static gint gtk_viewport_expose                   (GtkWidget        *widget,
  90                                                    GdkEventExpose   *event);
  91 static void gtk_viewport_add                      (GtkContainer     *container,
  92                                                    GtkWidget        *widget);
  93 static void gtk_viewport_size_allocate            (GtkWidget        *widget,
  94                                                    GtkAllocation    *allocation);
  95 static void gtk_viewport_adjustment_value_changed (GtkAdjustment    *adjustment,
  96                                                    gpointer          data);
  97 static void gtk_viewport_style_set                (GtkWidget *widget,
  98                                                    GtkStyle  *previous_style);
  99
 100 static void gtk_viewport_size_request_init        (GtkSizeRequestIface *iface);
 101 static void gtk_viewport_get_width                (GtkSizeRequest       *widget,
 102                                                    gint                 *minimum_size,
 103                                                    gint                 *natural_size);
 104 static void gtk_viewport_get_height               (GtkSizeRequest       *widget,
 105                                                    gint                 *minimum_size,
 106                                                    gint                 *natural_size);
 107
 108
 109 G_DEFINE_TYPE_WITH_CODE (GtkViewport, gtk_viewport, GTK_TYPE_BIN,
 110                          G_IMPLEMENT_INTERFACE (GTK_TYPE_SIZE_REQUEST,
 111                                                 gtk_viewport_size_request_init))
 112
 113 static void
 114 gtk_viewport_class_init (GtkViewportClass *class)
 115 {
 116   GtkObjectClass *object_class;
 117   GObjectClass   *gobject_class;
 118   GtkWidgetClass *widget_class;
 119   GtkContainerClass *container_class;
 120
 121   object_class = (GtkObjectClass*) class;
 122   gobject_class = G_OBJECT_CLASS (class);
 123   widget_class = (GtkWidgetClass*) class;
 124   container_class = (GtkContainerClass*) class;
 125
 126   gobject_class->finalize = gtk_viewport_finalize;
 127   gobject_class->set_property = gtk_viewport_set_property;
 128   gobject_class->get_property = gtk_viewport_get_property;
 129   object_class->destroy = gtk_viewport_destroy;
 130
 131   widget_class->realize = gtk_viewport_realize;
 132   widget_class->unrealize = gtk_viewport_unrealize;
 133   widget_class->expose_event = gtk_viewport_expose;
 134   widget_class->size_allocate = gtk_viewport_size_allocate;
 135   widget_class->style_set = gtk_viewport_style_set;
 136
 137   container_class->add = gtk_viewport_add;
 138
 139   class->set_scroll_adjustments = gtk_viewport_set_scroll_adjustments;
 140
 141   g_object_class_install_property (gobject_class,
 142                                    PROP_HADJUSTMENT,
 143                                    g_param_spec_object ("hadjustment",
 144                                                         P_("Horizontal adjustment"),
 145                                                         P_("The GtkAdjustment that determines the values of the horizontal position for this viewport"),
 146                                                         GTK_TYPE_ADJUSTMENT,
 147                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 148
 149   g_object_class_install_property (gobject_class,
 150                                    PROP_VADJUSTMENT,
 151                                    g_param_spec_object ("vadjustment",
 152                                                         P_("Vertical adjustment"),
 153                                                         P_("The GtkAdjustment that determines the values of the vertical position for this viewport"),
 154                                                         GTK_TYPE_ADJUSTMENT,
 155                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 156
 157   g_object_class_install_property (gobject_class,
 158                                    PROP_SHADOW_TYPE,
 159                                    g_param_spec_enum ("shadow-type",
 160                                                       P_("Shadow type"),
 161                                                       P_("Determines how the shadowed box around the viewport is drawn"),
 162                                                       GTK_TYPE_SHADOW_TYPE,
 163                                                       GTK_SHADOW_IN,
 164                                                       GTK_PARAM_READWRITE));
 165
 166   /**
 167    * GtkViewport::set-scroll-adjustments
 168    * @horizontal: the horizontal #GtkAdjustment
 169    * @vertical: the vertical #GtkAdjustment
 170    *
 171    * Set the scroll adjustments for the viewport. Usually scrolled containers
 172    * like #GtkScrolledWindow will emit this signal to connect two instances
 173    * of #GtkScrollbar to the scroll directions of the #GtkViewport.
 174    */
 175   widget_class->set_scroll_adjustments_signal =
 176     g_signal_new (I_("set-scroll-adjustments"),
 177                   G_OBJECT_CLASS_TYPE (gobject_class),
 178                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 179                   G_STRUCT_OFFSET (GtkViewportClass, set_scroll_adjustments),
 180                   NULL, NULL,
 181                   _gtk_marshal_VOID__OBJECT_OBJECT,
 182                   G_TYPE_NONE, 2,
 183                   GTK_TYPE_ADJUSTMENT,
 184                   GTK_TYPE_ADJUSTMENT);
 185
 186   g_type_class_add_private (class, sizeof (GtkViewportPrivate));
 187 }
 188
 189 static void
 190 gtk_viewport_set_property (GObject         *object,
 191                            guint            prop_id,
 192                            const GValue    *value,
 193                            GParamSpec      *pspec)
 194 {
 195   GtkViewport *viewport;
 196
 197   viewport = GTK_VIEWPORT (object);
 198
 199   switch (prop_id)
 200     {
 201     case PROP_HADJUSTMENT:
 202       gtk_viewport_set_hadjustment (viewport, g_value_get_object (value));
 203       break;
 204     case PROP_VADJUSTMENT:
 205       gtk_viewport_set_vadjustment (viewport, g_value_get_object (value));
 206       break;
 207     case PROP_SHADOW_TYPE:
 208       gtk_viewport_set_shadow_type (viewport, g_value_get_enum (value));
 209       break;
 210     default:
 211       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 212       break;
 213     }
 214 }
 215
 216 static void
 217 gtk_viewport_get_property (GObject         *object,
 218                            guint            prop_id,
 219                            GValue          *value,
 220                            GParamSpec      *pspec)
 221 {
 222   GtkViewport *viewport = GTK_VIEWPORT (object);
 223   GtkViewportPrivate *priv = viewport->priv;
 224
 225   switch (prop_id)
 226     {
 227     case PROP_HADJUSTMENT:
 228       g_value_set_object (value, priv->hadjustment);
 229       break;
 230     case PROP_VADJUSTMENT:
 231       g_value_set_object (value, priv->vadjustment);
 232       break;
 233     case PROP_SHADOW_TYPE:
 234       g_value_set_enum (value, priv->shadow_type);
 235       break;
 236     default:
 237       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 238       break;
 239     }
 240 }
 241
 242 static void
 243 gtk_viewport_init (GtkViewport *viewport)
 244 {
 245   GtkViewportPrivate *priv;
 246
 247   viewport->priv = G_TYPE_INSTANCE_GET_PRIVATE (viewport,
 248                                                 GTK_TYPE_VIEWPORT,
 249                                                 GtkViewportPrivate);
 250   priv = viewport->priv;
 251
 252   gtk_widget_set_has_window (GTK_WIDGET (viewport), TRUE);
 253
 254   gtk_widget_set_redraw_on_allocate (GTK_WIDGET (viewport), FALSE);
 255   gtk_container_set_resize_mode (GTK_CONTAINER (viewport), GTK_RESIZE_QUEUE);
 256
 257   priv->shadow_type = GTK_SHADOW_IN;
 258   priv->view_window = NULL;
 259   priv->bin_window = NULL;
 260   priv->hadjustment = NULL;
 261   priv->vadjustment = NULL;
 262 }
 263
 264 /**
 265  * gtk_viewport_new:
 266  * @hadjustment: horizontal adjustment.
 267  * @vadjustment: vertical adjustment.
 268  * @returns: a new #GtkViewport.
 269  *
 270  * Creates a new #GtkViewport with the given adjustments.
 271  *
 272  **/
 273 GtkWidget*
 274 gtk_viewport_new (GtkAdjustment *hadjustment,
 275                   GtkAdjustment *vadjustment)
 276 {
 277   GtkWidget *viewport;
 278
 279   viewport = g_object_new (GTK_TYPE_VIEWPORT,
 280                              "hadjustment", hadjustment,
 281                              "vadjustment", vadjustment,
 282                              NULL);
 283
 284   return viewport;
 285 }
 286
 287 #define ADJUSTMENT_POINTER(viewport, orientation)         \
 288   (((orientation) == GTK_ORIENTATION_HORIZONTAL) ?        \
 289      &(viewport)->priv->hadjustment : &(viewport)->priv->vadjustment)
 290
 291 static void
 292 viewport_disconnect_adjustment (GtkViewport    *viewport,
 293                                 GtkOrientation  orientation)
 294 {
 295   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 296
 297   if (*adjustmentp)
 298     {
 299       g_signal_handlers_disconnect_by_func (*adjustmentp,
 300                                             gtk_viewport_adjustment_value_changed,
 301                                             viewport);
 302       g_object_unref (*adjustmentp);
 303       *adjustmentp = NULL;
 304     }
 305 }
 306
 307 static void
 308 gtk_viewport_finalize (GObject *object)
 309 {
 310   GtkViewport *viewport = GTK_VIEWPORT (object);
 311
 312   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
 313   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
 314
 315   G_OBJECT_CLASS (gtk_viewport_parent_class)->finalize (object);
 316 }
 317
 318 static void
 319 gtk_viewport_destroy (GtkObject *object)
 320 {
 321   GtkViewport *viewport = GTK_VIEWPORT (object);
 322
 323   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
 324   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
 325
 326   GTK_OBJECT_CLASS (gtk_viewport_parent_class)->destroy (object);
 327 }
 328
 329 /**
 330  * gtk_viewport_get_hadjustment:
 331  * @viewport: a #GtkViewport.
 332  *
 333  * Returns the horizontal adjustment of the viewport.
 334  *
 335  * Return value: the horizontal adjustment of @viewport.
 336  **/
 337 GtkAdjustment*
 338 gtk_viewport_get_hadjustment (GtkViewport *viewport)
 339 {
 340   GtkViewportPrivate *priv;
 341
 342   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 343
 344   priv = viewport->priv;
 345
 346   if (!priv->hadjustment)
 347     gtk_viewport_set_hadjustment (viewport, NULL);
 348
 349   return priv->hadjustment;
 350 }
 351
 352 /**
 353  * gtk_viewport_get_vadjustment:
 354  * @viewport: a #GtkViewport.
 355  *
 356  * Returns the vertical adjustment of the viewport.
 357  *
 358  * Return value: the vertical adjustment of @viewport.
 359  **/
 360 GtkAdjustment*
 361 gtk_viewport_get_vadjustment (GtkViewport *viewport)
 362 {
 363   GtkViewportPrivate *priv;
 364
 365   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 366
 367   priv = viewport->priv;
 368
 369   if (!priv->vadjustment)
 370     gtk_viewport_set_vadjustment (viewport, NULL);
 371
 372   return priv->vadjustment;
 373 }
 374
 375 static void
 376 viewport_get_view_allocation (GtkViewport   *viewport,
 377                               GtkAllocation *view_allocation)
 378 {
 379   GtkViewportPrivate *priv = viewport->priv;
 380   GtkStyle *style;
 381   GtkWidget *widget = GTK_WIDGET (viewport);
 382   GtkAllocation allocation;
 383   guint border_width;
 384
 385   gtk_widget_get_allocation (widget, &allocation);
 386   border_width = gtk_container_get_border_width (GTK_CONTAINER (viewport));
 387
 388   view_allocation->x = 0;
 389   view_allocation->y = 0;
 390
 391   if (priv->shadow_type != GTK_SHADOW_NONE)
 392     {
 393       style = gtk_widget_get_style (widget);
 394       view_allocation->x = style->xthickness;
 395       view_allocation->y = style->ythickness;
 396     }
 397
 398   view_allocation->width = MAX (1, allocation.width - view_allocation->x * 2 - border_width * 2);
 399   view_allocation->height = MAX (1, allocation.height - view_allocation->y * 2 - border_width * 2);
 400 }
 401
 402 static void
 403 viewport_reclamp_adjustment (GtkAdjustment *adjustment,
 404                              gboolean      *value_changed)
 405 {
 406   gdouble value = adjustment->value;
 407
 408   value = CLAMP (value, 0, adjustment->upper - adjustment->page_size);
 409   if (value != adjustment->value)
 410     {
 411       adjustment->value = value;
 412       if (value_changed)
 413         *value_changed = TRUE;
 414     }
 415   else if (value_changed)
 416     *value_changed = FALSE;
 417 }
 418
 419 static void
 420 viewport_set_hadjustment_values (GtkViewport *viewport,
 421                                  gboolean    *value_changed)
 422 {
 423   GtkBin *bin = GTK_BIN (viewport);
 424   GtkAllocation view_allocation;
 425   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 426   GtkWidget *child;
 427   gdouble old_page_size;
 428   gdouble old_upper;
 429   gdouble old_value;
 430
 431   viewport_get_view_allocation (viewport, &view_allocation);
 432
 433   old_page_size = hadjustment->page_size;
 434   old_upper = hadjustment->upper;
 435   old_value = hadjustment->value;
 436   hadjustment->page_size = view_allocation.width;
 437   hadjustment->step_increment = view_allocation.width * 0.1;
 438   hadjustment->page_increment = view_allocation.width * 0.9;
 439
 440   hadjustment->lower = 0;
 441
 442   child = gtk_bin_get_child (bin);
 443   if (child && gtk_widget_get_visible (child))
 444     {
 445       GtkRequisition child_requisition;
 446
 447       gtk_widget_get_child_requisition (child, &child_requisition);
 448       hadjustment->upper = MAX (child_requisition.width, view_allocation.width);
 449     }
 450   else
 451     hadjustment->upper = view_allocation.width;
 452
 453   if (gtk_widget_get_direction (GTK_WIDGET (viewport)) == GTK_TEXT_DIR_RTL)
 454     {
 455       gdouble dist = old_upper - (old_value + old_page_size);
 456       hadjustment->value = hadjustment->upper - dist - hadjustment->page_size;
 457       viewport_reclamp_adjustment (hadjustment, value_changed);
 458       *value_changed = (old_value != hadjustment->value);
 459     }
 460   else
 461     viewport_reclamp_adjustment (hadjustment, value_changed);
 462 }
 463
 464 static void
 465 viewport_set_vadjustment_values (GtkViewport *viewport,
 466                                  gboolean    *value_changed)
 467 {
 468   GtkBin *bin = GTK_BIN (viewport);
 469   GtkAllocation view_allocation;
 470   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 471   GtkWidget *child;
 472
 473   viewport_get_view_allocation (viewport, &view_allocation);
 474
 475   vadjustment->page_size = view_allocation.height;
 476   vadjustment->step_increment = view_allocation.height * 0.1;
 477   vadjustment->page_increment = view_allocation.height * 0.9;
 478
 479   vadjustment->lower = 0;
 480
 481   child = gtk_bin_get_child (bin);
 482   if (child && gtk_widget_get_visible (child))
 483     {
 484       gint natural_height;
 485
 486       gtk_size_request_get_height_for_width (GTK_SIZE_REQUEST (child),
 487                                              view_allocation.width,
 488                                              NULL,
 489                                              &natural_height);
 490       vadjustment->upper = MAX (natural_height, view_allocation.height);
 491     }
 492   else
 493     vadjustment->upper = view_allocation.height;
 494
 495   viewport_reclamp_adjustment (vadjustment, value_changed);
 496 }
 497
 498 static void
 499 viewport_set_adjustment (GtkViewport    *viewport,
 500                          GtkOrientation  orientation,
 501                          GtkAdjustment  *adjustment)
 502 {
 503   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 504   gboolean value_changed;
 505
 506   if (adjustment && adjustment == *adjustmentp)
 507     return;
 508
 509   if (!adjustment)
 510     adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
 511                                                      0.0, 0.0, 0.0));
 512   viewport_disconnect_adjustment (viewport, orientation);
 513   *adjustmentp = adjustment;
 514   g_object_ref_sink (adjustment);
 515
 516   if (orientation == GTK_ORIENTATION_HORIZONTAL)
 517     viewport_set_hadjustment_values (viewport, &value_changed);
 518   else
 519     viewport_set_vadjustment_values (viewport, &value_changed);
 520
 521   g_signal_connect (adjustment, "value-changed",
 522                     G_CALLBACK (gtk_viewport_adjustment_value_changed),
 523                     viewport);
 524
 525   gtk_adjustment_changed (adjustment);
 526
 527   if (value_changed)
 528     gtk_adjustment_value_changed (adjustment);
 529   else
 530     gtk_viewport_adjustment_value_changed (adjustment, viewport);
 531 }
 532
 533 /**
 534  * gtk_viewport_set_hadjustment:
 535  * @viewport: a #GtkViewport.
 536  * @adjustment: (allow-none): a #GtkAdjustment.
 537  *
 538  * Sets the horizontal adjustment of the viewport.
 539  **/
 540 void
 541 gtk_viewport_set_hadjustment (GtkViewport   *viewport,
 542                               GtkAdjustment *adjustment)
 543 {
 544   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 545   if (adjustment)
 546     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 547
 548   viewport_set_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL, adjustment);
 549
 550   g_object_notify (G_OBJECT (viewport), "hadjustment");
 551 }
 552
 553 /**
 554  * gtk_viewport_set_vadjustment:
 555  * @viewport: a #GtkViewport.
 556  * @adjustment: (allow-none): a #GtkAdjustment.
 557  *
 558  * Sets the vertical adjustment of the viewport.
 559  **/
 560 void
 561 gtk_viewport_set_vadjustment (GtkViewport   *viewport,
 562                               GtkAdjustment *adjustment)
 563 {
 564   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 565   if (adjustment)
 566     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 567
 568   viewport_set_adjustment (viewport, GTK_ORIENTATION_VERTICAL, adjustment);
 569
 570   g_object_notify (G_OBJECT (viewport), "vadjustment");
 571 }
 572
 573 static void
 574 gtk_viewport_set_scroll_adjustments (GtkViewport      *viewport,
 575                                      GtkAdjustment    *hadjustment,
 576                                      GtkAdjustment    *vadjustment)
 577 {
 578   gtk_viewport_set_hadjustment (viewport, hadjustment);
 579   gtk_viewport_set_vadjustment (viewport, vadjustment);
 580 }
 581
 582 /**
 583  * gtk_viewport_set_shadow_type:
 584  * @viewport: a #GtkViewport.
 585  * @type: the new shadow type.
 586  *
 587  * Sets the shadow type of the viewport.
 588  **/
 589 void
 590 gtk_viewport_set_shadow_type (GtkViewport   *viewport,
 591                               GtkShadowType  type)
 592 {
 593   GtkViewportPrivate *priv;
 594   GtkAllocation allocation;
 595   GtkWidget *widget;
 596
 597   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 598
 599   widget = GTK_WIDGET (viewport);
 600   priv = viewport->priv;
 601
 602   if ((GtkShadowType) priv->shadow_type != type)
 603     {
 604       priv->shadow_type = type;
 605
 606       if (gtk_widget_get_visible (widget))
 607         {
 608           gtk_widget_get_allocation (widget, &allocation);
 609           gtk_widget_size_allocate (widget, &allocation);
 610           gtk_widget_set_allocation (widget, &allocation);
 611           gtk_widget_queue_draw (widget);
 612         }
 613
 614       g_object_notify (G_OBJECT (viewport), "shadow-type");
 615     }
 616 }
 617
 618 /**
 619  * gtk_viewport_get_shadow_type:
 620  * @viewport: a #GtkViewport
 621  *
 622  * Gets the shadow type of the #GtkViewport. See
 623  * gtk_viewport_set_shadow_type().
 624  *
 625  * Return value: the shadow type
 626  **/
 627 GtkShadowType
 628 gtk_viewport_get_shadow_type (GtkViewport *viewport)
 629 {
 630   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), GTK_SHADOW_NONE);
 631
 632   return viewport->priv->shadow_type;
 633 }
 634
 635 /**
 636  * gtk_viewport_get_bin_window:
 637  * @viewport: a #GtkViewport
 638  *
 639  * Gets the bin window of the #GtkViewport.
 640  *
 641  * Return value: a #GdkWindow
 642  *
 643  * Since: 2.20
 644  **/
 645 GdkWindow*
 646 gtk_viewport_get_bin_window (GtkViewport *viewport)
 647 {
 648   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 649
 650   return viewport->priv->bin_window;
 651 }
 652
 653 /**
 654  * gtk_viewport_get_view_window:
 655  * @viewport: a #GtkViewport
 656  *
 657  * Gets the view window of the #GtkViewport.
 658  *
 659  * Return value: (transfer none): a #GdkWindow
 660  *
 661  * Since: 2.22
 662  **/
 663 GdkWindow*
 664 gtk_viewport_get_view_window (GtkViewport *viewport)
 665 {
 666   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 667
 668   return viewport->priv->view_window;
 669 }
 670
 671 static void
 672 gtk_viewport_realize (GtkWidget *widget)
 673 {
 674   GtkViewport *viewport = GTK_VIEWPORT (widget);
 675   GtkViewportPrivate *priv = viewport->priv;
 676   GtkBin *bin = GTK_BIN (widget);
 677   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 678   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 679   GtkAllocation allocation;
 680   GtkAllocation view_allocation;
 681   GtkStyle *style;
 682   GtkWidget *child;
 683   GdkWindow *window;
 684   GdkWindowAttr attributes;
 685   gint attributes_mask;
 686   gint event_mask;
 687   guint border_width;
 688
 689   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
 690
 691   gtk_widget_set_realized (widget, TRUE);
 692
 693   gtk_widget_get_allocation (widget, &allocation);
 694
 695   attributes.x = allocation.x + border_width;
 696   attributes.y = allocation.y + border_width;
 697   attributes.width = allocation.width - border_width * 2;
 698   attributes.height = allocation.height - border_width * 2;
 699   attributes.window_type = GDK_WINDOW_CHILD;
 700   attributes.wclass = GDK_INPUT_OUTPUT;
 701   attributes.visual = gtk_widget_get_visual (widget);
 702   attributes.colormap = gtk_widget_get_colormap (widget);
 703
 704   event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 705   /* We select on button_press_mask so that button 4-5 scrolls are trapped.
 706    */
 707   attributes.event_mask = event_mask | GDK_BUTTON_PRESS_MASK;
 708
 709   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 710
 711   window = gdk_window_new (gtk_widget_get_parent_window (widget),
 712                            &attributes, attributes_mask);
 713   gtk_widget_set_window (widget, window);
 714   gdk_window_set_user_data (window, viewport);
 715
 716   viewport_get_view_allocation (viewport, &view_allocation);
 717
 718   attributes.x = view_allocation.x;
 719   attributes.y = view_allocation.y;
 720   attributes.width = view_allocation.width;
 721   attributes.height = view_allocation.height;
 722   attributes.event_mask = 0;
 723
 724   priv->view_window = gdk_window_new (window,
 725                                       &attributes, attributes_mask);
 726   gdk_window_set_user_data (priv->view_window, viewport);
 727
 728   gdk_window_set_back_pixmap (priv->view_window, NULL, FALSE);
 729
 730   attributes.x = - hadjustment->value;
 731   attributes.y = - vadjustment->value;
 732   attributes.width = hadjustment->upper;
 733   attributes.height = vadjustment->upper;
 734
 735   attributes.event_mask = event_mask;
 736
 737   priv->bin_window = gdk_window_new (priv->view_window, &attributes, attributes_mask);
 738   gdk_window_set_user_data (priv->bin_window, viewport);
 739
 740   child = gtk_bin_get_child (bin);
 741   if (child)
 742     gtk_widget_set_parent_window (child, priv->bin_window);
 743
 744   gtk_widget_style_attach (widget);
 745   style = gtk_widget_get_style (widget);
 746   gtk_style_set_background (style, window, GTK_STATE_NORMAL);
 747   gtk_style_set_background (style, priv->bin_window, GTK_STATE_NORMAL);
 748
 749   /* Call paint here to allow a theme to set the background without flashing
 750    */
 751   gtk_paint_flat_box(style, priv->bin_window, GTK_STATE_NORMAL,
 752                      GTK_SHADOW_NONE,
 753                      NULL, widget, "viewportbin",
 754                      0, 0, -1, -1);
 755
 756   gdk_window_show (priv->bin_window);
 757   gdk_window_show (priv->view_window);
 758 }
 759
 760 static void
 761 gtk_viewport_unrealize (GtkWidget *widget)
 762 {
 763   GtkViewport *viewport = GTK_VIEWPORT (widget);
 764   GtkViewportPrivate *priv = viewport->priv;
 765
 766   gdk_window_set_user_data (priv->view_window, NULL);
 767   gdk_window_destroy (priv->view_window);
 768   priv->view_window = NULL;
 769
 770   gdk_window_set_user_data (priv->bin_window, NULL);
 771   gdk_window_destroy (priv->bin_window);
 772   priv->bin_window = NULL;
 773
 774   GTK_WIDGET_CLASS (gtk_viewport_parent_class)->unrealize (widget);
 775 }
 776
 777 static void
 778 gtk_viewport_paint (GtkWidget    *widget,
 779                     GdkRectangle *area)
 780 {
 781   if (gtk_widget_is_drawable (widget))
 782     {
 783       GtkViewport *viewport = GTK_VIEWPORT (widget);
 784       GtkViewportPrivate *priv = viewport->priv;
 785
 786       gtk_paint_shadow (gtk_widget_get_style (widget),
 787                         gtk_widget_get_window (widget),
 788                         GTK_STATE_NORMAL, priv->shadow_type,
 789                         area, widget, "viewport",
 790                         0, 0, -1, -1);
 791     }
 792 }
 793
 794 static gint
 795 gtk_viewport_expose (GtkWidget      *widget,
 796                      GdkEventExpose *event)
 797 {
 798   GtkViewport *viewport;
 799
 800   if (gtk_widget_is_drawable (widget))
 801     {
 802       viewport = GTK_VIEWPORT (widget);
 803       GtkViewportPrivate *priv = viewport->priv;
 804
 805       if (event->window == gtk_widget_get_window (widget))
 806         gtk_viewport_paint (widget, &event->area);
 807       else if (event->window == priv->bin_window)
 808         {
 809           gtk_paint_flat_box(gtk_widget_get_style (widget), priv->bin_window,
 810                              GTK_STATE_NORMAL, GTK_SHADOW_NONE,
 811                              &event->area, widget, "viewportbin",
 812                              0, 0, -1, -1);
 813
 814           GTK_WIDGET_CLASS (gtk_viewport_parent_class)->expose_event (widget, event);
 815         }
 816     }
 817
 818   return FALSE;
 819 }
 820
 821 static void
 822 gtk_viewport_add (GtkContainer *container,
 823                   GtkWidget    *child)
 824 {
 825   GtkBin *bin = GTK_BIN (container);
 826   GtkViewport *viewport = GTK_VIEWPORT (bin);
 827   GtkViewportPrivate *priv = viewport->priv;
 828
 829   g_return_if_fail (gtk_bin_get_child (bin) == NULL);
 830
 831   gtk_widget_set_parent_window (child, priv->bin_window);
 832
 833   GTK_CONTAINER_CLASS (gtk_viewport_parent_class)->add (container, child);
 834 }
 835
 836 static void
 837 gtk_viewport_size_allocate (GtkWidget     *widget,
 838                             GtkAllocation *allocation)
 839 {
 840   GtkAllocation widget_allocation;
 841   GtkViewport *viewport = GTK_VIEWPORT (widget);
 842   GtkViewportPrivate *priv = viewport->priv;
 843   GtkBin *bin = GTK_BIN (widget);
 844   guint border_width;
 845   gboolean hadjustment_value_changed, vadjustment_value_changed;
 846   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 847   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 848   GtkAllocation child_allocation;
 849   GtkWidget *child;
 850
 851   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
 852
 853   /* If our size changed, and we have a shadow, queue a redraw on widget->window to
 854    * redraw the shadow correctly.
 855    */
 856   gtk_widget_get_allocation (widget, &widget_allocation);
 857   if (gtk_widget_get_mapped (widget) &&
 858       priv->shadow_type != GTK_SHADOW_NONE &&
 859       (widget_allocation.width != allocation->width ||
 860        widget_allocation.height != allocation->height))
 861     gdk_window_invalidate_rect (gtk_widget_get_window (widget), NULL, FALSE);
 862
 863   gtk_widget_set_allocation (widget, allocation);
 864
 865   viewport_set_hadjustment_values (viewport, &hadjustment_value_changed);
 866   viewport_set_vadjustment_values (viewport, &vadjustment_value_changed);
 867
 868   child_allocation.x = 0;
 869   child_allocation.y = 0;
 870   child_allocation.width = hadjustment->upper;
 871   child_allocation.height = vadjustment->upper;
 872   if (gtk_widget_get_realized (widget))
 873     {
 874       GtkAllocation view_allocation;
 875
 876       gdk_window_move_resize (gtk_widget_get_window (widget),
 877                               allocation->x + border_width,
 878                               allocation->y + border_width,
 879                               allocation->width - border_width * 2,
 880                               allocation->height - border_width * 2);
 881
 882       viewport_get_view_allocation (viewport, &view_allocation);
 883       gdk_window_move_resize (priv->view_window,
 884                               view_allocation.x,
 885                               view_allocation.y,
 886                               view_allocation.width,
 887                               view_allocation.height);
 888       gdk_window_move_resize (priv->bin_window,
 889                               - hadjustment->value,
 890                               - vadjustment->value,
 891                               child_allocation.width,
 892                               child_allocation.height);
 893     }
 894
 895   child = gtk_bin_get_child (bin);
 896   if (child && gtk_widget_get_visible (child))
 897     gtk_widget_size_allocate (child, &child_allocation);
 898
 899   gtk_adjustment_changed (hadjustment);
 900   gtk_adjustment_changed (vadjustment);
 901   if (hadjustment_value_changed)
 902     gtk_adjustment_value_changed (hadjustment);
 903   if (vadjustment_value_changed)
 904     gtk_adjustment_value_changed (vadjustment);
 905 }
 906
 907 static void
 908 gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
 909                                        gpointer       data)
 910 {
 911   GtkViewport *viewport = GTK_VIEWPORT (data);
 912   GtkViewportPrivate *priv = viewport->priv;
 913   GtkBin *bin = GTK_BIN (data);
 914   GtkWidget *child;
 915
 916   child = gtk_bin_get_child (bin);
 917   if (child && gtk_widget_get_visible (child) &&
 918       gtk_widget_get_realized (GTK_WIDGET (viewport)))
 919     {
 920       GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 921       GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 922       gint old_x, old_y;
 923       gint new_x, new_y;
 924
 925       gdk_window_get_position (priv->bin_window, &old_x, &old_y);
 926       new_x = - hadjustment->value;
 927       new_y = - vadjustment->value;
 928
 929       if (new_x != old_x || new_y != old_y)
 930         {
 931           gdk_window_move (priv->bin_window, new_x, new_y);
 932           gdk_window_process_updates (priv->bin_window, TRUE);
 933         }
 934     }
 935 }
 936
 937 static void
 938 gtk_viewport_style_set (GtkWidget *widget,
 939                         GtkStyle  *previous_style)
 940 {
 941    if (gtk_widget_get_realized (widget) &&
 942        gtk_widget_get_has_window (widget))
 943      {
 944         GtkStyle *style;
 945         GtkViewport *viewport = GTK_VIEWPORT (widget);
 946         GtkViewportPrivate *priv = viewport->priv;
 947
 948         style = gtk_widget_get_style (widget);
 949         gtk_style_set_background (style, priv->bin_window, GTK_STATE_NORMAL);
 950         gtk_style_set_background (style,
 951                                   gtk_widget_get_window (widget),
 952                                   gtk_widget_get_state (widget));
 953      }
 954 }
 955
 956
 957 static void
 958 gtk_viewport_size_request_init (GtkSizeRequestIface *iface)
 959 {
 960   iface->get_width  = gtk_viewport_get_width;
 961   iface->get_height = gtk_viewport_get_height;
 962 }
 963
 964 static void
 965 gtk_viewport_get_size (GtkSizeRequest *widget,
 966                        GtkOrientation  orientation,
 967                        gint           *minimum_size,
 968                        gint           *natural_size)
 969 {
 970   GtkViewport *viewport = GTK_VIEWPORT (widget);
 971   GtkViewportPrivate *priv = viewport->priv;
 972   GtkStyle  *style;
 973   GtkWidget *child;
 974   gint       child_min, child_nat;
 975   gint       minimum, natural;
 976
 977   child = gtk_bin_get_child (GTK_BIN (widget));
 978
 979   /* XXX This should probably be (border_width * 2); but GTK+ has
 980    * been doing this with a single border for a while now...
 981    */
 982   minimum = gtk_container_get_border_width (GTK_CONTAINER (widget));
 983
 984   if (priv->shadow_type != GTK_SHADOW_NONE)
 985     {
 986       style = gtk_widget_get_style (GTK_WIDGET (widget));
 987       if (orientation == GTK_ORIENTATION_HORIZONTAL)
 988           minimum += 2 * style->xthickness;
 989       else
 990           minimum += 2 * style->ythickness;
 991     }
 992
 993   natural = minimum;
 994
 995   if (child && gtk_widget_get_visible (child))
 996     {
 997       if (orientation == GTK_ORIENTATION_HORIZONTAL)
 998         gtk_size_request_get_width (GTK_SIZE_REQUEST (child), &child_min, &child_nat);
 999       else
1000         gtk_size_request_get_height (GTK_SIZE_REQUEST (child), &child_min, &child_nat);
1001
1002       minimum += child_min;
1003       natural += child_nat;
1004     }
1005
1006   if (minimum_size)
1007     *minimum_size = minimum;
1008
1009   if (natural_size)
1010     *natural_size = natural;
1011 }
1012
1013 static void
1014 gtk_viewport_get_width (GtkSizeRequest *widget,
1015                         gint           *minimum_size,
1016                         gint           *natural_size)
1017 {
1018   gtk_viewport_get_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
1019 }
1020
1021 static void
1022 gtk_viewport_get_height (GtkSizeRequest *widget,
1023                          gint           *minimum_size,
1024                          gint           *natural_size)
1025 {
1026   gtk_viewport_get_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
1027 }