Pileus Git - ~andy/gtk/blob - gtk/gtkviewport.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GTK+ Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #include "config.h"
  28 #include "gtkviewport.h"
  29 #include "gtkintl.h"
  30 #include "gtkmarshalers.h"
  31 #include "gtkprivate.h"
  32
  33
  34 /**
  35  * SECTION:gtkviewport
  36  * @Short_description: An adapter which makes widgets scrollable
  37  * @Title: GtkViewport
  38  * @See_also:#GtkScrolledWindow, #GtkAdjustment
  39  *
  40  * The #GtkViewport widget acts as an adaptor class, implementing
  41  * scrollability for child widgets that lack their own scrolling
  42  * capabilities. Use #GtkViewport to scroll child widgets such as
  43  * #GtkTable, #GtkBox, and so on.
  44  *
  45  * If a widget has native scrolling abilities, such as #GtkTextView,
  46  * #GtkTreeView or #GtkIconview, it can be added to a #GtkScrolledWindow
  47  * with gtk_container_add(). If a widget does not, you must first add the
  48  * widget to a #GtkViewport, then add the viewport to the scrolled window.
  49  * The convenience function gtk_scrolled_window_add_with_viewport() does
  50  * exactly this, so you can ignore the presence of the viewport.
  51  *
  52  * The #GtkViewport will start scrolling content only if allocated less
  53  * than the child widget's minimum size in a given orientation.
  54  */
  55
  56 struct _GtkViewportPrivate
  57 {
  58   GtkAdjustment  *hadjustment;
  59   GtkAdjustment  *vadjustment;
  60   GtkShadowType   shadow_type;
  61
  62   GdkWindow      *bin_window;
  63   GdkWindow      *view_window;
  64 };
  65
  66 enum {
  67   PROP_0,
  68   PROP_HADJUSTMENT,
  69   PROP_VADJUSTMENT,
  70   PROP_SHADOW_TYPE
  71 };
  72
  73
  74 static void gtk_viewport_finalize                 (GObject          *object);
  75 static void gtk_viewport_destroy                  (GtkObject        *object);
  76 static void gtk_viewport_set_property             (GObject         *object,
  77                                                    guint            prop_id,
  78                                                    const GValue    *value,
  79                                                    GParamSpec      *pspec);
  80 static void gtk_viewport_get_property             (GObject         *object,
  81                                                    guint            prop_id,
  82                                                    GValue          *value,
  83                                                    GParamSpec      *pspec);
  84 static void gtk_viewport_set_scroll_adjustments   (GtkViewport      *viewport,
  85                                                    GtkAdjustment    *hadjustment,
  86                                                    GtkAdjustment    *vadjustment);
  87 static void gtk_viewport_realize                  (GtkWidget        *widget);
  88 static void gtk_viewport_unrealize                (GtkWidget        *widget);
  89 static gint gtk_viewport_draw                     (GtkWidget        *widget,
  90                                                    cairo_t          *cr);
  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_get_preferred_width      (GtkWidget        *widget,
 101                                                    gint             *minimum_size,
 102                                                    gint             *natural_size);
 103 static void gtk_viewport_get_preferred_height     (GtkWidget        *widget,
 104                                                    gint             *minimum_size,
 105                                                    gint             *natural_size);
 106
 107
 108 G_DEFINE_TYPE (GtkViewport, gtk_viewport, GTK_TYPE_BIN)
 109
 110 static void
 111 gtk_viewport_class_init (GtkViewportClass *class)
 112 {
 113   GtkObjectClass *object_class;
 114   GObjectClass   *gobject_class;
 115   GtkWidgetClass *widget_class;
 116   GtkContainerClass *container_class;
 117
 118   object_class = (GtkObjectClass*) class;
 119   gobject_class = G_OBJECT_CLASS (class);
 120   widget_class = (GtkWidgetClass*) class;
 121   container_class = (GtkContainerClass*) class;
 122
 123   gobject_class->finalize = gtk_viewport_finalize;
 124   gobject_class->set_property = gtk_viewport_set_property;
 125   gobject_class->get_property = gtk_viewport_get_property;
 126   object_class->destroy = gtk_viewport_destroy;
 127
 128   widget_class->realize = gtk_viewport_realize;
 129   widget_class->unrealize = gtk_viewport_unrealize;
 130   widget_class->draw = gtk_viewport_draw;
 131   widget_class->size_allocate = gtk_viewport_size_allocate;
 132   widget_class->style_set = gtk_viewport_style_set;
 133   widget_class->get_preferred_width = gtk_viewport_get_preferred_width;
 134   widget_class->get_preferred_height = gtk_viewport_get_preferred_height;
 135
 136   container_class->add = gtk_viewport_add;
 137
 138   class->set_scroll_adjustments = gtk_viewport_set_scroll_adjustments;
 139
 140   g_object_class_install_property (gobject_class,
 141                                    PROP_HADJUSTMENT,
 142                                    g_param_spec_object ("hadjustment",
 143                                                         P_("Horizontal adjustment"),
 144                                                         P_("The GtkAdjustment that determines the values of the horizontal position for this viewport"),
 145                                                         GTK_TYPE_ADJUSTMENT,
 146                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 147
 148   g_object_class_install_property (gobject_class,
 149                                    PROP_VADJUSTMENT,
 150                                    g_param_spec_object ("vadjustment",
 151                                                         P_("Vertical adjustment"),
 152                                                         P_("The GtkAdjustment that determines the values of the vertical position for this viewport"),
 153                                                         GTK_TYPE_ADJUSTMENT,
 154                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 155
 156   g_object_class_install_property (gobject_class,
 157                                    PROP_SHADOW_TYPE,
 158                                    g_param_spec_enum ("shadow-type",
 159                                                       P_("Shadow type"),
 160                                                       P_("Determines how the shadowed box around the viewport is drawn"),
 161                                                       GTK_TYPE_SHADOW_TYPE,
 162                                                       GTK_SHADOW_IN,
 163                                                       GTK_PARAM_READWRITE));
 164
 165   /**
 166    * GtkViewport::set-scroll-adjustments
 167    * @horizontal: the horizontal #GtkAdjustment
 168    * @vertical: the vertical #GtkAdjustment
 169    *
 170    * Set the scroll adjustments for the viewport. Usually scrolled containers
 171    * like #GtkScrolledWindow will emit this signal to connect two instances
 172    * of #GtkScrollbar to the scroll directions of the #GtkViewport.
 173    */
 174   widget_class->set_scroll_adjustments_signal =
 175     g_signal_new (I_("set-scroll-adjustments"),
 176                   G_OBJECT_CLASS_TYPE (gobject_class),
 177                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 178                   G_STRUCT_OFFSET (GtkViewportClass, set_scroll_adjustments),
 179                   NULL, NULL,
 180                   _gtk_marshal_VOID__OBJECT_OBJECT,
 181                   G_TYPE_NONE, 2,
 182                   GTK_TYPE_ADJUSTMENT,
 183                   GTK_TYPE_ADJUSTMENT);
 184
 185   g_type_class_add_private (class, sizeof (GtkViewportPrivate));
 186 }
 187
 188 static void
 189 gtk_viewport_set_property (GObject         *object,
 190                            guint            prop_id,
 191                            const GValue    *value,
 192                            GParamSpec      *pspec)
 193 {
 194   GtkViewport *viewport;
 195
 196   viewport = GTK_VIEWPORT (object);
 197
 198   switch (prop_id)
 199     {
 200     case PROP_HADJUSTMENT:
 201       gtk_viewport_set_hadjustment (viewport, g_value_get_object (value));
 202       break;
 203     case PROP_VADJUSTMENT:
 204       gtk_viewport_set_vadjustment (viewport, g_value_get_object (value));
 205       break;
 206     case PROP_SHADOW_TYPE:
 207       gtk_viewport_set_shadow_type (viewport, g_value_get_enum (value));
 208       break;
 209     default:
 210       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 211       break;
 212     }
 213 }
 214
 215 static void
 216 gtk_viewport_get_property (GObject         *object,
 217                            guint            prop_id,
 218                            GValue          *value,
 219                            GParamSpec      *pspec)
 220 {
 221   GtkViewport *viewport = GTK_VIEWPORT (object);
 222   GtkViewportPrivate *priv = viewport->priv;
 223
 224   switch (prop_id)
 225     {
 226     case PROP_HADJUSTMENT:
 227       g_value_set_object (value, priv->hadjustment);
 228       break;
 229     case PROP_VADJUSTMENT:
 230       g_value_set_object (value, priv->vadjustment);
 231       break;
 232     case PROP_SHADOW_TYPE:
 233       g_value_set_enum (value, priv->shadow_type);
 234       break;
 235     default:
 236       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 237       break;
 238     }
 239 }
 240
 241 static void
 242 gtk_viewport_init (GtkViewport *viewport)
 243 {
 244   GtkViewportPrivate *priv;
 245
 246   viewport->priv = G_TYPE_INSTANCE_GET_PRIVATE (viewport,
 247                                                 GTK_TYPE_VIEWPORT,
 248                                                 GtkViewportPrivate);
 249   priv = viewport->priv;
 250
 251   gtk_widget_set_has_window (GTK_WIDGET (viewport), TRUE);
 252
 253   gtk_widget_set_redraw_on_allocate (GTK_WIDGET (viewport), FALSE);
 254   gtk_container_set_resize_mode (GTK_CONTAINER (viewport), GTK_RESIZE_QUEUE);
 255
 256   priv->shadow_type = GTK_SHADOW_IN;
 257   priv->view_window = NULL;
 258   priv->bin_window = NULL;
 259   priv->hadjustment = NULL;
 260   priv->vadjustment = NULL;
 261 }
 262
 263 /**
 264  * gtk_viewport_new:
 265  * @hadjustment: horizontal adjustment.
 266  * @vadjustment: vertical adjustment.
 267  * @returns: a new #GtkViewport.
 268  *
 269  * Creates a new #GtkViewport with the given adjustments.
 270  *
 271  **/
 272 GtkWidget*
 273 gtk_viewport_new (GtkAdjustment *hadjustment,
 274                   GtkAdjustment *vadjustment)
 275 {
 276   GtkWidget *viewport;
 277
 278   viewport = g_object_new (GTK_TYPE_VIEWPORT,
 279                              "hadjustment", hadjustment,
 280                              "vadjustment", vadjustment,
 281                              NULL);
 282
 283   return viewport;
 284 }
 285
 286 #define ADJUSTMENT_POINTER(viewport, orientation)         \
 287   (((orientation) == GTK_ORIENTATION_HORIZONTAL) ?        \
 288      &(viewport)->priv->hadjustment : &(viewport)->priv->vadjustment)
 289
 290 static void
 291 viewport_disconnect_adjustment (GtkViewport    *viewport,
 292                                 GtkOrientation  orientation)
 293 {
 294   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 295
 296   if (*adjustmentp)
 297     {
 298       g_signal_handlers_disconnect_by_func (*adjustmentp,
 299                                             gtk_viewport_adjustment_value_changed,
 300                                             viewport);
 301       g_object_unref (*adjustmentp);
 302       *adjustmentp = NULL;
 303     }
 304 }
 305
 306 static void
 307 gtk_viewport_finalize (GObject *object)
 308 {
 309   GtkViewport *viewport = GTK_VIEWPORT (object);
 310
 311   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
 312   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
 313
 314   G_OBJECT_CLASS (gtk_viewport_parent_class)->finalize (object);
 315 }
 316
 317 static void
 318 gtk_viewport_destroy (GtkObject *object)
 319 {
 320   GtkViewport *viewport = GTK_VIEWPORT (object);
 321
 322   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
 323   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
 324
 325   GTK_OBJECT_CLASS (gtk_viewport_parent_class)->destroy (object);
 326 }
 327
 328 /**
 329  * gtk_viewport_get_hadjustment:
 330  * @viewport: a #GtkViewport.
 331  *
 332  * Returns the horizontal adjustment of the viewport.
 333  *
 334  * Return value: (transfer none): the horizontal adjustment of @viewport.
 335  **/
 336 GtkAdjustment*
 337 gtk_viewport_get_hadjustment (GtkViewport *viewport)
 338 {
 339   GtkViewportPrivate *priv;
 340
 341   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 342
 343   priv = viewport->priv;
 344
 345   if (!priv->hadjustment)
 346     gtk_viewport_set_hadjustment (viewport, NULL);
 347
 348   return priv->hadjustment;
 349 }
 350
 351 /**
 352  * gtk_viewport_get_vadjustment:
 353  * @viewport: a #GtkViewport.
 354  *
 355  * Returns the vertical adjustment of the viewport.
 356  *
 357  * Return value: (transfer none): the vertical adjustment of @viewport.
 358  **/
 359 GtkAdjustment*
 360 gtk_viewport_get_vadjustment (GtkViewport *viewport)
 361 {
 362   GtkViewportPrivate *priv;
 363
 364   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 365
 366   priv = viewport->priv;
 367
 368   if (!priv->vadjustment)
 369     gtk_viewport_set_vadjustment (viewport, NULL);
 370
 371   return priv->vadjustment;
 372 }
 373
 374 static void
 375 viewport_get_view_allocation (GtkViewport   *viewport,
 376                               GtkAllocation *view_allocation)
 377 {
 378   GtkViewportPrivate *priv = viewport->priv;
 379   GtkStyle *style;
 380   GtkWidget *widget = GTK_WIDGET (viewport);
 381   GtkAllocation allocation;
 382   guint border_width;
 383
 384   gtk_widget_get_allocation (widget, &allocation);
 385   border_width = gtk_container_get_border_width (GTK_CONTAINER (viewport));
 386
 387   view_allocation->x = 0;
 388   view_allocation->y = 0;
 389
 390   if (priv->shadow_type != GTK_SHADOW_NONE)
 391     {
 392       style = gtk_widget_get_style (widget);
 393       view_allocation->x = style->xthickness;
 394       view_allocation->y = style->ythickness;
 395     }
 396
 397   view_allocation->width = MAX (1, allocation.width - view_allocation->x * 2 - border_width * 2);
 398   view_allocation->height = MAX (1, allocation.height - view_allocation->y * 2 - border_width * 2);
 399 }
 400
 401 static void
 402 viewport_reclamp_adjustment (GtkAdjustment *adjustment,
 403                              gboolean      *value_changed)
 404 {
 405   gdouble value = adjustment->value;
 406
 407   value = CLAMP (value, 0, adjustment->upper - adjustment->page_size);
 408   if (value != adjustment->value)
 409     {
 410       adjustment->value = value;
 411       if (value_changed)
 412         *value_changed = TRUE;
 413     }
 414   else if (value_changed)
 415     *value_changed = FALSE;
 416 }
 417
 418 static void
 419 viewport_set_hadjustment_values (GtkViewport *viewport,
 420                                  gboolean    *value_changed)
 421 {
 422   GtkBin *bin = GTK_BIN (viewport);
 423   GtkAllocation view_allocation;
 424   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 425   GtkWidget *child;
 426   gdouble old_page_size;
 427   gdouble old_upper;
 428   gdouble old_value;
 429
 430   viewport_get_view_allocation (viewport, &view_allocation);
 431
 432   old_page_size = hadjustment->page_size;
 433   old_upper = hadjustment->upper;
 434   old_value = hadjustment->value;
 435   hadjustment->page_size = view_allocation.width;
 436   hadjustment->step_increment = view_allocation.width * 0.1;
 437   hadjustment->page_increment = view_allocation.width * 0.9;
 438
 439   hadjustment->lower = 0;
 440
 441   child = gtk_bin_get_child (bin);
 442   if (child && gtk_widget_get_visible (child))
 443     {
 444       gint minimum_width;
 445
 446       gtk_widget_get_preferred_width_for_height (child,
 447                                                  view_allocation.height,
 448                                                  &minimum_width,
 449                                                  NULL);
 450       hadjustment->upper = MAX (minimum_width, view_allocation.width);
 451     }
 452   else
 453     hadjustment->upper = view_allocation.width;
 454
 455   if (gtk_widget_get_direction (GTK_WIDGET (viewport)) == GTK_TEXT_DIR_RTL)
 456     {
 457       gdouble dist = old_upper - (old_value + old_page_size);
 458       hadjustment->value = hadjustment->upper - dist - hadjustment->page_size;
 459       viewport_reclamp_adjustment (hadjustment, value_changed);
 460       *value_changed = (old_value != hadjustment->value);
 461     }
 462   else
 463     viewport_reclamp_adjustment (hadjustment, value_changed);
 464 }
 465
 466 static void
 467 viewport_set_vadjustment_values (GtkViewport *viewport,
 468                                  gboolean    *value_changed)
 469 {
 470   GtkBin *bin = GTK_BIN (viewport);
 471   GtkAllocation view_allocation;
 472   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 473   GtkWidget *child;
 474
 475   viewport_get_view_allocation (viewport, &view_allocation);
 476
 477   vadjustment->page_size = view_allocation.height;
 478   vadjustment->step_increment = view_allocation.height * 0.1;
 479   vadjustment->page_increment = view_allocation.height * 0.9;
 480
 481   vadjustment->lower = 0;
 482
 483   child = gtk_bin_get_child (bin);
 484   if (child && gtk_widget_get_visible (child))
 485     {
 486       gint minimum_height;
 487
 488       gtk_widget_get_preferred_height_for_width (child,
 489                                                  view_allocation.width,
 490                                                  &minimum_height,
 491                                                  NULL);
 492
 493       vadjustment->upper = MAX (minimum_height, view_allocation.height);
 494     }
 495   else
 496     vadjustment->upper = view_allocation.height;
 497
 498   viewport_reclamp_adjustment (vadjustment, value_changed);
 499 }
 500
 501 static void
 502 viewport_set_adjustment (GtkViewport    *viewport,
 503                          GtkOrientation  orientation,
 504                          GtkAdjustment  *adjustment)
 505 {
 506   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 507   gboolean value_changed;
 508
 509   if (adjustment && adjustment == *adjustmentp)
 510     return;
 511
 512   if (!adjustment)
 513     adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
 514                                                      0.0, 0.0, 0.0));
 515   viewport_disconnect_adjustment (viewport, orientation);
 516   *adjustmentp = adjustment;
 517   g_object_ref_sink (adjustment);
 518
 519   if (orientation == GTK_ORIENTATION_HORIZONTAL)
 520     viewport_set_hadjustment_values (viewport, &value_changed);
 521   else
 522     viewport_set_vadjustment_values (viewport, &value_changed);
 523
 524   g_signal_connect (adjustment, "value-changed",
 525                     G_CALLBACK (gtk_viewport_adjustment_value_changed),
 526                     viewport);
 527
 528   gtk_adjustment_changed (adjustment);
 529
 530   if (value_changed)
 531     gtk_adjustment_value_changed (adjustment);
 532   else
 533     gtk_viewport_adjustment_value_changed (adjustment, viewport);
 534 }
 535
 536 /**
 537  * gtk_viewport_set_hadjustment:
 538  * @viewport: a #GtkViewport.
 539  * @adjustment: (allow-none): a #GtkAdjustment.
 540  *
 541  * Sets the horizontal adjustment of the viewport.
 542  **/
 543 void
 544 gtk_viewport_set_hadjustment (GtkViewport   *viewport,
 545                               GtkAdjustment *adjustment)
 546 {
 547   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 548   if (adjustment)
 549     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 550
 551   viewport_set_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL, adjustment);
 552
 553   g_object_notify (G_OBJECT (viewport), "hadjustment");
 554 }
 555
 556 /**
 557  * gtk_viewport_set_vadjustment:
 558  * @viewport: a #GtkViewport.
 559  * @adjustment: (allow-none): a #GtkAdjustment.
 560  *
 561  * Sets the vertical adjustment of the viewport.
 562  **/
 563 void
 564 gtk_viewport_set_vadjustment (GtkViewport   *viewport,
 565                               GtkAdjustment *adjustment)
 566 {
 567   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 568   if (adjustment)
 569     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 570
 571   viewport_set_adjustment (viewport, GTK_ORIENTATION_VERTICAL, adjustment);
 572
 573   g_object_notify (G_OBJECT (viewport), "vadjustment");
 574 }
 575
 576 static void
 577 gtk_viewport_set_scroll_adjustments (GtkViewport      *viewport,
 578                                      GtkAdjustment    *hadjustment,
 579                                      GtkAdjustment    *vadjustment)
 580 {
 581   gtk_viewport_set_hadjustment (viewport, hadjustment);
 582   gtk_viewport_set_vadjustment (viewport, vadjustment);
 583 }
 584
 585 /**
 586  * gtk_viewport_set_shadow_type:
 587  * @viewport: a #GtkViewport.
 588  * @type: the new shadow type.
 589  *
 590  * Sets the shadow type of the viewport.
 591  **/
 592 void
 593 gtk_viewport_set_shadow_type (GtkViewport   *viewport,
 594                               GtkShadowType  type)
 595 {
 596   GtkViewportPrivate *priv;
 597   GtkAllocation allocation;
 598   GtkWidget *widget;
 599
 600   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 601
 602   widget = GTK_WIDGET (viewport);
 603   priv = viewport->priv;
 604
 605   if ((GtkShadowType) priv->shadow_type != type)
 606     {
 607       priv->shadow_type = type;
 608
 609       if (gtk_widget_get_visible (widget))
 610         {
 611           gtk_widget_get_allocation (widget, &allocation);
 612           gtk_widget_size_allocate (widget, &allocation);
 613           gtk_widget_set_allocation (widget, &allocation);
 614           gtk_widget_queue_draw (widget);
 615         }
 616
 617       g_object_notify (G_OBJECT (viewport), "shadow-type");
 618     }
 619 }
 620
 621 /**
 622  * gtk_viewport_get_shadow_type:
 623  * @viewport: a #GtkViewport
 624  *
 625  * Gets the shadow type of the #GtkViewport. See
 626  * gtk_viewport_set_shadow_type().
 627  *
 628  * Return value: the shadow type
 629  **/
 630 GtkShadowType
 631 gtk_viewport_get_shadow_type (GtkViewport *viewport)
 632 {
 633   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), GTK_SHADOW_NONE);
 634
 635   return viewport->priv->shadow_type;
 636 }
 637
 638 /**
 639  * gtk_viewport_get_bin_window:
 640  * @viewport: a #GtkViewport
 641  *
 642  * Gets the bin window of the #GtkViewport.
 643  *
 644  * Return value: (transfer none): a #GdkWindow
 645  *
 646  * Since: 2.20
 647  **/
 648 GdkWindow*
 649 gtk_viewport_get_bin_window (GtkViewport *viewport)
 650 {
 651   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 652
 653   return viewport->priv->bin_window;
 654 }
 655
 656 /**
 657  * gtk_viewport_get_view_window:
 658  * @viewport: a #GtkViewport
 659  *
 660  * Gets the view window of the #GtkViewport.
 661  *
 662  * Return value: (transfer none): a #GdkWindow
 663  *
 664  * Since: 2.22
 665  **/
 666 GdkWindow*
 667 gtk_viewport_get_view_window (GtkViewport *viewport)
 668 {
 669   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 670
 671   return viewport->priv->view_window;
 672 }
 673
 674 static void
 675 gtk_viewport_realize (GtkWidget *widget)
 676 {
 677   GtkViewport *viewport = GTK_VIEWPORT (widget);
 678   GtkViewportPrivate *priv = viewport->priv;
 679   GtkBin *bin = GTK_BIN (widget);
 680   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 681   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 682   GtkAllocation allocation;
 683   GtkAllocation view_allocation;
 684   GtkStyle *style;
 685   GtkWidget *child;
 686   GdkWindow *window;
 687   GdkWindowAttr attributes;
 688   gint attributes_mask;
 689   gint event_mask;
 690   guint border_width;
 691
 692   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
 693
 694   gtk_widget_set_realized (widget, TRUE);
 695
 696   gtk_widget_get_allocation (widget, &allocation);
 697
 698   attributes.x = allocation.x + border_width;
 699   attributes.y = allocation.y + border_width;
 700   attributes.width = allocation.width - border_width * 2;
 701   attributes.height = allocation.height - border_width * 2;
 702   attributes.window_type = GDK_WINDOW_CHILD;
 703   attributes.wclass = GDK_INPUT_OUTPUT;
 704   attributes.visual = gtk_widget_get_visual (widget);
 705
 706   event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 707   /* We select on button_press_mask so that button 4-5 scrolls are trapped.
 708    */
 709   attributes.event_mask = event_mask | GDK_BUTTON_PRESS_MASK;
 710
 711   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
 712
 713   window = gdk_window_new (gtk_widget_get_parent_window (widget),
 714                            &attributes, attributes_mask);
 715   gtk_widget_set_window (widget, window);
 716   gdk_window_set_user_data (window, viewport);
 717
 718   viewport_get_view_allocation (viewport, &view_allocation);
 719
 720   attributes.x = view_allocation.x;
 721   attributes.y = view_allocation.y;
 722   attributes.width = view_allocation.width;
 723   attributes.height = view_allocation.height;
 724   attributes.event_mask = 0;
 725
 726   priv->view_window = gdk_window_new (window,
 727                                       &attributes, attributes_mask);
 728   gdk_window_set_user_data (priv->view_window, viewport);
 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   gdk_window_show (priv->bin_window);
 750   gdk_window_show (priv->view_window);
 751 }
 752
 753 static void
 754 gtk_viewport_unrealize (GtkWidget *widget)
 755 {
 756   GtkViewport *viewport = GTK_VIEWPORT (widget);
 757   GtkViewportPrivate *priv = viewport->priv;
 758
 759   gdk_window_set_user_data (priv->view_window, NULL);
 760   gdk_window_destroy (priv->view_window);
 761   priv->view_window = NULL;
 762
 763   gdk_window_set_user_data (priv->bin_window, NULL);
 764   gdk_window_destroy (priv->bin_window);
 765   priv->bin_window = NULL;
 766
 767   GTK_WIDGET_CLASS (gtk_viewport_parent_class)->unrealize (widget);
 768 }
 769
 770 static gint
 771 gtk_viewport_draw (GtkWidget *widget,
 772                    cairo_t   *cr)
 773 {
 774   GtkViewport *viewport = GTK_VIEWPORT (widget);
 775   GtkViewportPrivate *priv = viewport->priv;
 776   int x, y;
 777
 778   if (gtk_cairo_should_draw_window (cr, gtk_widget_get_window (widget)))
 779     {
 780       gtk_paint_shadow (gtk_widget_get_style (widget),
 781                         cr,
 782                         GTK_STATE_NORMAL, priv->shadow_type,
 783                         widget, "viewport",
 784                         0, 0,
 785                         gdk_window_get_width (gtk_widget_get_window (widget)),
 786                         gdk_window_get_height (gtk_widget_get_window (widget)));
 787     }
 788
 789   if (gtk_cairo_should_draw_window (cr, priv->bin_window))
 790     {
 791       gdk_window_get_position (priv->bin_window, &x, &y);
 792       gtk_paint_flat_box (gtk_widget_get_style (widget), cr,
 793                           GTK_STATE_NORMAL, GTK_SHADOW_NONE,
 794                           widget, "viewportbin",
 795                           x, y,
 796                           gdk_window_get_width (priv->bin_window),
 797                           gdk_window_get_height (priv->bin_window));
 798
 799       GTK_WIDGET_CLASS (gtk_viewport_parent_class)->draw (widget, cr);
 800     }
 801
 802   return FALSE;
 803 }
 804
 805 static void
 806 gtk_viewport_add (GtkContainer *container,
 807                   GtkWidget    *child)
 808 {
 809   GtkBin *bin = GTK_BIN (container);
 810   GtkViewport *viewport = GTK_VIEWPORT (bin);
 811   GtkViewportPrivate *priv = viewport->priv;
 812
 813   g_return_if_fail (gtk_bin_get_child (bin) == NULL);
 814
 815   gtk_widget_set_parent_window (child, priv->bin_window);
 816
 817   GTK_CONTAINER_CLASS (gtk_viewport_parent_class)->add (container, child);
 818 }
 819
 820 static void
 821 gtk_viewport_size_allocate (GtkWidget     *widget,
 822                             GtkAllocation *allocation)
 823 {
 824   GtkAllocation widget_allocation;
 825   GtkViewport *viewport = GTK_VIEWPORT (widget);
 826   GtkViewportPrivate *priv = viewport->priv;
 827   GtkBin *bin = GTK_BIN (widget);
 828   guint border_width;
 829   gboolean hadjustment_value_changed, vadjustment_value_changed;
 830   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 831   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 832   GtkAllocation child_allocation;
 833   GtkWidget *child;
 834
 835   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
 836
 837   /* If our size changed, and we have a shadow, queue a redraw on widget->window to
 838    * redraw the shadow correctly.
 839    */
 840   gtk_widget_get_allocation (widget, &widget_allocation);
 841   if (gtk_widget_get_mapped (widget) &&
 842       priv->shadow_type != GTK_SHADOW_NONE &&
 843       (widget_allocation.width != allocation->width ||
 844        widget_allocation.height != allocation->height))
 845     gdk_window_invalidate_rect (gtk_widget_get_window (widget), NULL, FALSE);
 846
 847   gtk_widget_set_allocation (widget, allocation);
 848
 849   viewport_set_hadjustment_values (viewport, &hadjustment_value_changed);
 850   viewport_set_vadjustment_values (viewport, &vadjustment_value_changed);
 851
 852   child_allocation.x = 0;
 853   child_allocation.y = 0;
 854   child_allocation.width = hadjustment->upper;
 855   child_allocation.height = vadjustment->upper;
 856   if (gtk_widget_get_realized (widget))
 857     {
 858       GtkAllocation view_allocation;
 859
 860       gdk_window_move_resize (gtk_widget_get_window (widget),
 861                               allocation->x + border_width,
 862                               allocation->y + border_width,
 863                               allocation->width - border_width * 2,
 864                               allocation->height - border_width * 2);
 865
 866       viewport_get_view_allocation (viewport, &view_allocation);
 867       gdk_window_move_resize (priv->view_window,
 868                               view_allocation.x,
 869                               view_allocation.y,
 870                               view_allocation.width,
 871                               view_allocation.height);
 872       gdk_window_move_resize (priv->bin_window,
 873                               - hadjustment->value,
 874                               - vadjustment->value,
 875                               child_allocation.width,
 876                               child_allocation.height);
 877     }
 878
 879   child = gtk_bin_get_child (bin);
 880   if (child && gtk_widget_get_visible (child))
 881     gtk_widget_size_allocate (child, &child_allocation);
 882
 883   gtk_adjustment_changed (hadjustment);
 884   gtk_adjustment_changed (vadjustment);
 885   if (hadjustment_value_changed)
 886     gtk_adjustment_value_changed (hadjustment);
 887   if (vadjustment_value_changed)
 888     gtk_adjustment_value_changed (vadjustment);
 889 }
 890
 891 static void
 892 gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
 893                                        gpointer       data)
 894 {
 895   GtkViewport *viewport = GTK_VIEWPORT (data);
 896   GtkViewportPrivate *priv = viewport->priv;
 897   GtkBin *bin = GTK_BIN (data);
 898   GtkWidget *child;
 899
 900   child = gtk_bin_get_child (bin);
 901   if (child && gtk_widget_get_visible (child) &&
 902       gtk_widget_get_realized (GTK_WIDGET (viewport)))
 903     {
 904       GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 905       GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 906       gint old_x, old_y;
 907       gint new_x, new_y;
 908
 909       gdk_window_get_position (priv->bin_window, &old_x, &old_y);
 910       new_x = - hadjustment->value;
 911       new_y = - vadjustment->value;
 912
 913       if (new_x != old_x || new_y != old_y)
 914         {
 915           gdk_window_move (priv->bin_window, new_x, new_y);
 916           gdk_window_process_updates (priv->bin_window, TRUE);
 917         }
 918     }
 919 }
 920
 921 static void
 922 gtk_viewport_style_set (GtkWidget *widget,
 923                         GtkStyle  *previous_style)
 924 {
 925    if (gtk_widget_get_realized (widget) &&
 926        gtk_widget_get_has_window (widget))
 927      {
 928         GtkStyle *style;
 929         GtkViewport *viewport = GTK_VIEWPORT (widget);
 930         GtkViewportPrivate *priv = viewport->priv;
 931
 932         style = gtk_widget_get_style (widget);
 933         gtk_style_set_background (style, priv->bin_window, GTK_STATE_NORMAL);
 934         gtk_style_set_background (style,
 935                                   gtk_widget_get_window (widget),
 936                                   gtk_widget_get_state (widget));
 937      }
 938 }
 939
 940
 941 static void
 942 gtk_viewport_get_preferred_size (GtkWidget      *widget,
 943                                  GtkOrientation  orientation,
 944                                  gint           *minimum_size,
 945                                  gint           *natural_size)
 946 {
 947   GtkViewport *viewport = GTK_VIEWPORT (widget);
 948   GtkViewportPrivate *priv = viewport->priv;
 949   GtkStyle  *style;
 950   GtkWidget *child;
 951   gint       child_min, child_nat;
 952   gint       minimum, natural;
 953
 954   child = gtk_bin_get_child (GTK_BIN (widget));
 955
 956   /* XXX This should probably be (border_width * 2); but GTK+ has
 957    * been doing this with a single border for a while now...
 958    */
 959   minimum = gtk_container_get_border_width (GTK_CONTAINER (widget));
 960
 961   if (priv->shadow_type != GTK_SHADOW_NONE)
 962     {
 963       style = gtk_widget_get_style (GTK_WIDGET (widget));
 964       if (orientation == GTK_ORIENTATION_HORIZONTAL)
 965           minimum += 2 * style->xthickness;
 966       else
 967           minimum += 2 * style->ythickness;
 968     }
 969
 970   natural = minimum;
 971
 972   if (child && gtk_widget_get_visible (child))
 973     {
 974       if (orientation == GTK_ORIENTATION_HORIZONTAL)
 975         gtk_widget_get_preferred_width (child, &child_min, &child_nat);
 976       else
 977         gtk_widget_get_preferred_height (child, &child_min, &child_nat);
 978
 979       minimum += child_min;
 980       natural += child_nat;
 981     }
 982
 983   if (minimum_size)
 984     *minimum_size = minimum;
 985
 986   if (natural_size)
 987     *natural_size = natural;
 988 }
 989
 990 static void
 991 gtk_viewport_get_preferred_width (GtkWidget *widget,
 992                                   gint      *minimum_size,
 993                                   gint      *natural_size)
 994 {
 995   gtk_viewport_get_preferred_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
 996 }
 997
 998 static void
 999 gtk_viewport_get_preferred_height (GtkWidget *widget,
1000                                    gint      *minimum_size,
1001                                    gint      *natural_size)
1002 {
1003   gtk_viewport_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
1004 }