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