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
  32 enum {
  33   PROP_0,
  34   PROP_HADJUSTMENT,
  35   PROP_VADJUSTMENT,
  36   PROP_SHADOW_TYPE
  37 };
  38
  39
  40 static void gtk_viewport_class_init               (GtkViewportClass *klass);
  41 static void gtk_viewport_init                     (GtkViewport      *viewport);
  42 static void gtk_viewport_finalize                 (GObject          *object);
  43 static void gtk_viewport_destroy                  (GtkObject        *object);
  44 static void gtk_viewport_set_property             (GObject         *object,
  45                                                    guint            prop_id,
  46                                                    const GValue    *value,
  47                                                    GParamSpec      *pspec);
  48 static void gtk_viewport_get_property             (GObject         *object,
  49                                                    guint            prop_id,
  50                                                    GValue          *value,
  51                                                    GParamSpec      *pspec);
  52 static void gtk_viewport_set_scroll_adjustments   (GtkViewport      *viewport,
  53                                                    GtkAdjustment    *hadjustment,
  54                                                    GtkAdjustment    *vadjustment);
  55 static void gtk_viewport_realize                  (GtkWidget        *widget);
  56 static void gtk_viewport_unrealize                (GtkWidget        *widget);
  57 static void gtk_viewport_paint                    (GtkWidget        *widget,
  58                                                    GdkRectangle     *area);
  59 static gint gtk_viewport_expose                   (GtkWidget        *widget,
  60                                                    GdkEventExpose   *event);
  61 static void gtk_viewport_add                      (GtkContainer     *container,
  62                                                    GtkWidget        *widget);
  63 static void gtk_viewport_size_request             (GtkWidget        *widget,
  64                                                    GtkRequisition   *requisition);
  65 static void gtk_viewport_size_allocate            (GtkWidget        *widget,
  66                                                    GtkAllocation    *allocation);
  67 static void gtk_viewport_adjustment_value_changed (GtkAdjustment    *adjustment,
  68                                                    gpointer          data);
  69 static void gtk_viewport_style_set                (GtkWidget *widget,
  70                                                    GtkStyle  *previous_style);
  71
  72 static GtkBinClass *parent_class;
  73
  74 GType
  75 gtk_viewport_get_type (void)
  76 {
  77   static GType viewport_type = 0;
  78
  79   if (!viewport_type)
  80     {
  81       static const GTypeInfo viewport_info =
  82       {
  83         sizeof (GtkViewportClass),
  84         NULL,           /* base_init */
  85         NULL,           /* base_finalize */
  86         (GClassInitFunc) gtk_viewport_class_init,
  87         NULL,           /* class_finalize */
  88         NULL,           /* class_data */
  89         sizeof (GtkViewport),
  90         0,              /* n_preallocs */
  91         (GInstanceInitFunc) gtk_viewport_init,
  92       };
  93
  94       viewport_type = g_type_register_static (GTK_TYPE_BIN, "GtkViewport",
  95                                               &viewport_info, 0);
  96     }
  97
  98   return viewport_type;
  99 }
 100
 101 static void
 102 gtk_viewport_class_init (GtkViewportClass *class)
 103 {
 104   GtkObjectClass *object_class;
 105   GObjectClass   *gobject_class;
 106   GtkWidgetClass *widget_class;
 107   GtkContainerClass *container_class;
 108
 109   object_class = (GtkObjectClass*) class;
 110   gobject_class = G_OBJECT_CLASS (class);
 111   widget_class = (GtkWidgetClass*) class;
 112   container_class = (GtkContainerClass*) class;
 113
 114   parent_class = g_type_class_peek_parent (class);
 115
 116   gobject_class->finalize = gtk_viewport_finalize;
 117   gobject_class->set_property = gtk_viewport_set_property;
 118   gobject_class->get_property = gtk_viewport_get_property;
 119   object_class->destroy = gtk_viewport_destroy;
 120
 121   widget_class->realize = gtk_viewport_realize;
 122   widget_class->unrealize = gtk_viewport_unrealize;
 123   widget_class->expose_event = gtk_viewport_expose;
 124   widget_class->size_request = gtk_viewport_size_request;
 125   widget_class->size_allocate = gtk_viewport_size_allocate;
 126   widget_class->style_set = gtk_viewport_style_set;
 127
 128   container_class->add = gtk_viewport_add;
 129
 130   class->set_scroll_adjustments = gtk_viewport_set_scroll_adjustments;
 131
 132   g_object_class_install_property (gobject_class,
 133                                    PROP_HADJUSTMENT,
 134                                    g_param_spec_object ("hadjustment",
 135                                                         P_("Horizontal adjustment"),
 136                                                         P_("The GtkAdjustment that determines the values of the horizontal position for this viewport"),
 137                                                         GTK_TYPE_ADJUSTMENT,
 138                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 139
 140   g_object_class_install_property (gobject_class,
 141                                    PROP_VADJUSTMENT,
 142                                    g_param_spec_object ("vadjustment",
 143                                                         P_("Vertical adjustment"),
 144                                                         P_("The GtkAdjustment that determines the values of the vertical position for this viewport"),
 145                                                         GTK_TYPE_ADJUSTMENT,
 146                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 147
 148   g_object_class_install_property (gobject_class,
 149                                    PROP_SHADOW_TYPE,
 150                                    g_param_spec_enum ("shadow_type",
 151                                                       P_("Shadow type"),
 152                                                       P_("Determines how the shadowed box around the viewport is drawn"),
 153                                                       GTK_TYPE_SHADOW_TYPE,
 154                                                       GTK_SHADOW_IN,
 155                                                       G_PARAM_READWRITE));
 156
 157   widget_class->set_scroll_adjustments_signal =
 158     g_signal_new ("set_scroll_adjustments",
 159                   G_OBJECT_CLASS_TYPE (gobject_class),
 160                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 161                   G_STRUCT_OFFSET (GtkViewportClass, set_scroll_adjustments),
 162                   NULL, NULL,
 163                   _gtk_marshal_VOID__OBJECT_OBJECT,
 164                   G_TYPE_NONE, 2,
 165                   GTK_TYPE_ADJUSTMENT,
 166                   GTK_TYPE_ADJUSTMENT);
 167 }
 168
 169 static void
 170 gtk_viewport_set_property (GObject         *object,
 171                            guint            prop_id,
 172                            const GValue    *value,
 173                            GParamSpec      *pspec)
 174 {
 175   GtkViewport *viewport;
 176
 177   viewport = GTK_VIEWPORT (object);
 178
 179   switch (prop_id)
 180     {
 181     case PROP_HADJUSTMENT:
 182       gtk_viewport_set_hadjustment (viewport, g_value_get_object (value));
 183       break;
 184     case PROP_VADJUSTMENT:
 185       gtk_viewport_set_vadjustment (viewport, g_value_get_object (value));
 186       break;
 187     case PROP_SHADOW_TYPE:
 188       gtk_viewport_set_shadow_type (viewport, g_value_get_enum (value));
 189       break;
 190     default:
 191       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 192       break;
 193     }
 194 }
 195
 196 static void
 197 gtk_viewport_get_property (GObject         *object,
 198                            guint            prop_id,
 199                            GValue          *value,
 200                            GParamSpec      *pspec)
 201 {
 202   GtkViewport *viewport;
 203
 204   viewport = GTK_VIEWPORT (object);
 205
 206   switch (prop_id)
 207     {
 208     case PROP_HADJUSTMENT:
 209       g_value_set_object (value, viewport->hadjustment);
 210       break;
 211     case PROP_VADJUSTMENT:
 212       g_value_set_object (value, viewport->vadjustment);
 213       break;
 214     case PROP_SHADOW_TYPE:
 215       g_value_set_enum (value, viewport->shadow_type);
 216       break;
 217     default:
 218       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 219       break;
 220     }
 221 }
 222
 223 static void
 224 gtk_viewport_init (GtkViewport *viewport)
 225 {
 226   GTK_WIDGET_UNSET_FLAGS (viewport, GTK_NO_WINDOW);
 227
 228   gtk_widget_set_redraw_on_allocate (GTK_WIDGET (viewport), FALSE);
 229   gtk_container_set_resize_mode (GTK_CONTAINER (viewport), GTK_RESIZE_QUEUE);
 230
 231   viewport->shadow_type = GTK_SHADOW_IN;
 232   viewport->view_window = NULL;
 233   viewport->bin_window = NULL;
 234   viewport->hadjustment = NULL;
 235   viewport->vadjustment = NULL;
 236 }
 237
 238 /**
 239  * gtk_viewport_new:
 240  * @hadjustment: horizontal adjustment.
 241  * @vadjustment: vertical adjustment.
 242  * @returns: a new #GtkViewport.
 243  *
 244  * Creates a new #GtkViewport with the given adjustments.
 245  *
 246  **/
 247 GtkWidget*
 248 gtk_viewport_new (GtkAdjustment *hadjustment,
 249                   GtkAdjustment *vadjustment)
 250 {
 251   GtkWidget *viewport;
 252
 253   viewport = gtk_widget_new (GTK_TYPE_VIEWPORT,
 254                              "hadjustment", hadjustment,
 255                              "vadjustment", vadjustment,
 256                              NULL);
 257
 258   return viewport;
 259 }
 260
 261 #define ADJUSTMENT_POINTER(viewport, orientation)         \
 262   (((orientation) == GTK_ORIENTATION_HORIZONTAL) ?        \
 263      &(viewport)->hadjustment : &(viewport)->vadjustment)
 264
 265 static void
 266 viewport_disconnect_adjustment (GtkViewport    *viewport,
 267                                 GtkOrientation  orientation)
 268 {
 269   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 270
 271   if (*adjustmentp)
 272     {
 273       g_signal_handlers_disconnect_by_func (*adjustmentp,
 274                                             gtk_viewport_adjustment_value_changed,
 275                                             viewport);
 276       g_object_unref (*adjustmentp);
 277       *adjustmentp = NULL;
 278     }
 279 }
 280
 281 static void
 282 gtk_viewport_finalize (GObject *object)
 283 {
 284   GtkViewport *viewport = GTK_VIEWPORT (object);
 285
 286   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
 287   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
 288
 289   G_OBJECT_CLASS (parent_class)->finalize (object);
 290 }
 291
 292 static void
 293 gtk_viewport_destroy (GtkObject *object)
 294 {
 295   GtkViewport *viewport = GTK_VIEWPORT (object);
 296
 297   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
 298   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
 299
 300   GTK_OBJECT_CLASS (parent_class)->destroy (object);
 301 }
 302
 303 /**
 304  * gtk_viewport_get_hadjustment:
 305  * @viewport: a #GtkViewport.
 306  *
 307  * Returns the horizontal adjustment of the viewport.
 308  *
 309  * Return value: the horizontal adjustment of @viewport.
 310  **/
 311 GtkAdjustment*
 312 gtk_viewport_get_hadjustment (GtkViewport *viewport)
 313 {
 314   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 315
 316   if (!viewport->hadjustment)
 317     gtk_viewport_set_hadjustment (viewport, NULL);
 318
 319   return viewport->hadjustment;
 320 }
 321
 322 /**
 323  * gtk_viewport_get_vadjustment:
 324  * @viewport: a #GtkViewport.
 325  *
 326  * Returns the vertical adjustment of the viewport.
 327  *
 328  * Return value: the vertical adjustment of @viewport.
 329  **/
 330 GtkAdjustment*
 331 gtk_viewport_get_vadjustment (GtkViewport *viewport)
 332 {
 333   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 334
 335   if (!viewport->vadjustment)
 336     gtk_viewport_set_vadjustment (viewport, NULL);
 337
 338   return viewport->vadjustment;
 339 }
 340
 341 static void
 342 viewport_get_view_allocation (GtkViewport   *viewport,
 343                               GtkAllocation *view_allocation)
 344 {
 345   GtkWidget *widget = GTK_WIDGET (viewport);
 346   GtkAllocation *allocation = &widget->allocation;
 347   gint border_width = GTK_CONTAINER (viewport)->border_width;
 348
 349   view_allocation->x = 0;
 350   view_allocation->y = 0;
 351
 352   if (viewport->shadow_type != GTK_SHADOW_NONE)
 353     {
 354       view_allocation->x = widget->style->xthickness;
 355       view_allocation->y = widget->style->ythickness;
 356     }
 357
 358   view_allocation->width = MAX (1, allocation->width - view_allocation->x * 2 - border_width * 2);
 359   view_allocation->height = MAX (1, allocation->height - view_allocation->y * 2 - border_width * 2);
 360 }
 361
 362 static void
 363 viewport_reclamp_adjustment (GtkAdjustment *adjustment,
 364                              gboolean      *value_changed)
 365 {
 366   gdouble value = adjustment->value;
 367
 368   value = CLAMP (value, 0, adjustment->upper - adjustment->page_size);
 369   if (value != adjustment->value)
 370     {
 371       adjustment->value = value;
 372       if (value_changed)
 373         *value_changed = TRUE;
 374     }
 375   else if (value_changed)
 376     *value_changed = FALSE;
 377 }
 378
 379 static void
 380 viewport_set_hadjustment_values (GtkViewport *viewport,
 381                                  gboolean    *value_changed)
 382 {
 383   GtkBin *bin = GTK_BIN (viewport);
 384   GtkAllocation view_allocation;
 385   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 386   gdouble old_page_size;
 387   gdouble old_upper;
 388   gdouble old_value;
 389
 390   viewport_get_view_allocation (viewport, &view_allocation);
 391
 392   old_page_size = hadjustment->page_size;
 393   old_upper = hadjustment->upper;
 394   old_value = hadjustment->value;
 395   hadjustment->page_size = view_allocation.width;
 396   hadjustment->step_increment = view_allocation.width * 0.1;
 397   hadjustment->page_increment = view_allocation.width * 0.9;
 398
 399   hadjustment->lower = 0;
 400
 401   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 402     {
 403       GtkRequisition child_requisition;
 404
 405       gtk_widget_get_child_requisition (bin->child, &child_requisition);
 406       hadjustment->upper = MAX (child_requisition.width, view_allocation.width);
 407     }
 408   else
 409     hadjustment->upper = view_allocation.width;
 410
 411   if (gtk_widget_get_direction (GTK_WIDGET (viewport)) == GTK_TEXT_DIR_RTL)
 412     {
 413       gdouble dist = old_upper - (old_value + old_page_size);
 414       hadjustment->value = hadjustment->upper - dist - hadjustment->page_size;
 415       viewport_reclamp_adjustment (hadjustment, value_changed);
 416       *value_changed = (old_value != hadjustment->value);
 417     }
 418   else
 419     viewport_reclamp_adjustment (hadjustment, value_changed);
 420 }
 421
 422 static void
 423 viewport_set_vadjustment_values (GtkViewport *viewport,
 424                                  gboolean    *value_changed)
 425 {
 426   GtkBin *bin = GTK_BIN (viewport);
 427   GtkAllocation view_allocation;
 428   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 429
 430   viewport_get_view_allocation (viewport, &view_allocation);
 431
 432   vadjustment->page_size = view_allocation.height;
 433   vadjustment->step_increment = view_allocation.height * 0.1;
 434   vadjustment->page_increment = view_allocation.height * 0.9;
 435
 436   vadjustment->lower = 0;
 437
 438   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 439     {
 440       GtkRequisition child_requisition;
 441
 442       gtk_widget_get_child_requisition (bin->child, &child_requisition);
 443       vadjustment->upper = MAX (child_requisition.height, view_allocation.height);
 444     }
 445   else
 446     vadjustment->upper = view_allocation.height;
 447
 448   viewport_reclamp_adjustment (vadjustment, value_changed);
 449 }
 450
 451 static void
 452 viewport_set_adjustment (GtkViewport    *viewport,
 453                          GtkOrientation  orientation,
 454                          GtkAdjustment  *adjustment)
 455 {
 456   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 457   gboolean value_changed;
 458
 459   if (adjustment && adjustment == *adjustmentp)
 460     return;
 461
 462   if (!adjustment)
 463     adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
 464                                                      0.0, 0.0, 0.0));
 465
 466   *adjustmentp = adjustment;
 467   g_object_ref (adjustment);
 468   gtk_object_sink (GTK_OBJECT (adjustment));
 469
 470   if (orientation == GTK_ORIENTATION_HORIZONTAL)
 471     viewport_set_hadjustment_values (viewport, &value_changed);
 472   else
 473     viewport_set_vadjustment_values (viewport, &value_changed);
 474
 475   g_signal_connect (adjustment, "value_changed",
 476                     G_CALLBACK (gtk_viewport_adjustment_value_changed),
 477                     viewport);
 478
 479   gtk_adjustment_changed (adjustment);
 480
 481   if (value_changed)
 482     gtk_adjustment_value_changed (adjustment);
 483   else
 484     gtk_viewport_adjustment_value_changed (adjustment, viewport);
 485 }
 486
 487 /**
 488  * gtk_viewport_set_hadjustment:
 489  * @viewport: a #GtkViewport.
 490  * @adjustment: a #GtkAdjustment.
 491  *
 492  * Sets the horizontal adjustment of the viewport.
 493  **/
 494 void
 495 gtk_viewport_set_hadjustment (GtkViewport   *viewport,
 496                               GtkAdjustment *adjustment)
 497 {
 498   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 499   if (adjustment)
 500     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 501
 502   viewport_set_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL, adjustment);
 503
 504   g_object_notify (G_OBJECT (viewport), "hadjustment");
 505 }
 506
 507 /**
 508  * gtk_viewport_set_vadjustment:
 509  * @viewport: a #GtkViewport.
 510  * @adjustment: a #GtkAdjustment.
 511  *
 512  * Sets the vertical adjustment of the viewport.
 513  **/
 514 void
 515 gtk_viewport_set_vadjustment (GtkViewport   *viewport,
 516                               GtkAdjustment *adjustment)
 517 {
 518   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 519   if (adjustment)
 520     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 521
 522   viewport_set_adjustment (viewport, GTK_ORIENTATION_VERTICAL, adjustment);
 523
 524   g_object_notify (G_OBJECT (viewport), "vadjustment");
 525 }
 526
 527 static void
 528 gtk_viewport_set_scroll_adjustments (GtkViewport      *viewport,
 529                                      GtkAdjustment    *hadjustment,
 530                                      GtkAdjustment    *vadjustment)
 531 {
 532   gtk_viewport_set_hadjustment (viewport, hadjustment);
 533   gtk_viewport_set_vadjustment (viewport, vadjustment);
 534 }
 535
 536 /**
 537  * gtk_viewport_set_shadow_type:
 538  * @viewport: a #GtkViewport.
 539  * @type: the new shadow type.
 540  *
 541  * Sets the shadow type of the viewport.
 542  **/
 543 void
 544 gtk_viewport_set_shadow_type (GtkViewport   *viewport,
 545                               GtkShadowType  type)
 546 {
 547   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 548
 549   if ((GtkShadowType) viewport->shadow_type != type)
 550     {
 551       viewport->shadow_type = type;
 552
 553       if (GTK_WIDGET_VISIBLE (viewport))
 554         {
 555           gtk_widget_size_allocate (GTK_WIDGET (viewport), &(GTK_WIDGET (viewport)->allocation));
 556           gtk_widget_queue_draw (GTK_WIDGET (viewport));
 557         }
 558
 559       g_object_notify (G_OBJECT (viewport), "shadow_type");
 560     }
 561 }
 562
 563 /**
 564  * gtk_viewport_get_shadow_type:
 565  * @viewport: a #GtkViewport
 566  *
 567  * Gets the shadow type of the #GtkViewport. See
 568  * gtk_viewport_set_shadow_type().
 569
 570  * Return value: the shadow type
 571  **/
 572 GtkShadowType
 573 gtk_viewport_get_shadow_type (GtkViewport *viewport)
 574 {
 575   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), GTK_SHADOW_NONE);
 576
 577   return viewport->shadow_type;
 578 }
 579
 580 static void
 581 gtk_viewport_realize (GtkWidget *widget)
 582 {
 583   GtkViewport *viewport = GTK_VIEWPORT (widget);
 584   GtkBin *bin = GTK_BIN (widget);
 585   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 586   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 587   gint border_width = GTK_CONTAINER (widget)->border_width;
 588
 589   GtkAllocation view_allocation;
 590   GdkWindowAttr attributes;
 591   gint attributes_mask;
 592   gint event_mask;
 593
 594   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 595
 596   attributes.x = widget->allocation.x + border_width;
 597   attributes.y = widget->allocation.y + border_width;
 598   attributes.width = widget->allocation.width - border_width * 2;
 599   attributes.height = widget->allocation.height - border_width * 2;
 600   attributes.window_type = GDK_WINDOW_CHILD;
 601   attributes.wclass = GDK_INPUT_OUTPUT;
 602   attributes.visual = gtk_widget_get_visual (widget);
 603   attributes.colormap = gtk_widget_get_colormap (widget);
 604
 605   event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 606   /* We select on button_press_mask so that button 4-5 scrolls are trapped.
 607    */
 608   attributes.event_mask = event_mask | GDK_BUTTON_PRESS_MASK;
 609
 610   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 611
 612   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 613                                    &attributes, attributes_mask);
 614   gdk_window_set_user_data (widget->window, viewport);
 615
 616   viewport_get_view_allocation (viewport, &view_allocation);
 617
 618   attributes.x = view_allocation.x;
 619   attributes.y = view_allocation.y;
 620   attributes.width = view_allocation.width;
 621   attributes.height = view_allocation.height;
 622   attributes.event_mask = 0;
 623
 624   viewport->view_window = gdk_window_new (widget->window, &attributes, attributes_mask);
 625   gdk_window_set_user_data (viewport->view_window, viewport);
 626
 627   attributes.x = - hadjustment->value;
 628   attributes.y = - vadjustment->value;
 629   attributes.width = hadjustment->upper;
 630   attributes.height = vadjustment->upper;
 631
 632   attributes.event_mask = event_mask;
 633
 634   viewport->bin_window = gdk_window_new (viewport->view_window, &attributes, attributes_mask);
 635   gdk_window_set_user_data (viewport->bin_window, viewport);
 636
 637   if (bin->child)
 638     gtk_widget_set_parent_window (bin->child, viewport->bin_window);
 639
 640   widget->style = gtk_style_attach (widget->style, widget->window);
 641   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 642   gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 643
 644   /* Call paint here to allow a theme to set the background without flashing
 645    */
 646   gtk_paint_flat_box(widget->style, viewport->bin_window, GTK_STATE_NORMAL,
 647                      GTK_SHADOW_NONE,
 648                      NULL, widget, "viewportbin",
 649                      0, 0, -1, -1);
 650
 651   gdk_window_show (viewport->bin_window);
 652   gdk_window_show (viewport->view_window);
 653 }
 654
 655 static void
 656 gtk_viewport_unrealize (GtkWidget *widget)
 657 {
 658   GtkViewport *viewport = GTK_VIEWPORT (widget);
 659
 660   gdk_window_set_user_data (viewport->view_window, NULL);
 661   gdk_window_destroy (viewport->view_window);
 662   viewport->view_window = NULL;
 663
 664   gdk_window_set_user_data (viewport->bin_window, NULL);
 665   gdk_window_destroy (viewport->bin_window);
 666   viewport->bin_window = NULL;
 667
 668   if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 669     (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 670 }
 671
 672 static void
 673 gtk_viewport_paint (GtkWidget    *widget,
 674                     GdkRectangle *area)
 675 {
 676   GtkViewport *viewport;
 677
 678   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 679   g_return_if_fail (area != NULL);
 680
 681   if (GTK_WIDGET_DRAWABLE (widget))
 682     {
 683       viewport = GTK_VIEWPORT (widget);
 684
 685       gtk_paint_shadow (widget->style, widget->window,
 686                         GTK_STATE_NORMAL, viewport->shadow_type,
 687                         NULL, widget, "viewport",
 688                         0, 0, -1, -1);
 689     }
 690 }
 691
 692 static gint
 693 gtk_viewport_expose (GtkWidget      *widget,
 694                      GdkEventExpose *event)
 695 {
 696   GtkViewport *viewport;
 697   GtkBin *bin;
 698
 699   if (GTK_WIDGET_DRAWABLE (widget))
 700     {
 701       viewport = GTK_VIEWPORT (widget);
 702       bin = GTK_BIN (widget);
 703
 704       if (event->window == widget->window)
 705         gtk_viewport_paint (widget, &event->area);
 706       else if (event->window == viewport->bin_window)
 707         {
 708           gtk_paint_flat_box(widget->style, viewport->bin_window,
 709                              GTK_STATE_NORMAL, GTK_SHADOW_NONE,
 710                              &event->area, widget, "viewportbin",
 711                              0, 0, -1, -1);
 712
 713           (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
 714         }
 715     }
 716
 717   return FALSE;
 718 }
 719
 720 static void
 721 gtk_viewport_add (GtkContainer *container,
 722                   GtkWidget    *child)
 723 {
 724   GtkBin *bin;
 725
 726   g_return_if_fail (GTK_IS_WIDGET (child));
 727
 728   bin = GTK_BIN (container);
 729   g_return_if_fail (bin->child == NULL);
 730
 731   gtk_widget_set_parent_window (child, GTK_VIEWPORT (bin)->bin_window);
 732
 733   GTK_CONTAINER_CLASS (parent_class)->add (container, child);
 734 }
 735
 736 static void
 737 gtk_viewport_size_request (GtkWidget      *widget,
 738                            GtkRequisition *requisition)
 739 {
 740   GtkViewport *viewport;
 741   GtkBin *bin;
 742   GtkRequisition child_requisition;
 743
 744   viewport = GTK_VIEWPORT (widget);
 745   bin = GTK_BIN (widget);
 746
 747   requisition->width = (GTK_CONTAINER (widget)->border_width +
 748                         GTK_WIDGET (widget)->style->xthickness) * 2;
 749
 750   requisition->height = (GTK_CONTAINER (widget)->border_width * 2 +
 751                          GTK_WIDGET (widget)->style->ythickness) * 2;
 752
 753   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 754     {
 755       gtk_widget_size_request (bin->child, &child_requisition);
 756       requisition->width += child_requisition.width;
 757       requisition->height += child_requisition.height;
 758     }
 759 }
 760
 761 static void
 762 gtk_viewport_size_allocate (GtkWidget     *widget,
 763                             GtkAllocation *allocation)
 764 {
 765   GtkViewport *viewport = GTK_VIEWPORT (widget);
 766   GtkBin *bin = GTK_BIN (widget);
 767   gint border_width = GTK_CONTAINER (widget)->border_width;
 768   gboolean hadjustment_value_changed, vadjustment_value_changed;
 769
 770   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 771   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 772
 773   /* If our size changed, and we have a shadow, queue a redraw on widget->window to
 774    * redraw the shadow correctly.
 775    */
 776   if (GTK_WIDGET_MAPPED (widget) &&
 777       viewport->shadow_type != GTK_SHADOW_NONE &&
 778       (widget->allocation.width != allocation->width ||
 779        widget->allocation.height != allocation->height))
 780     gdk_window_invalidate_rect (widget->window, NULL, FALSE);
 781
 782   widget->allocation = *allocation;
 783
 784   viewport_set_hadjustment_values (viewport, &hadjustment_value_changed);
 785   viewport_set_vadjustment_values (viewport, &vadjustment_value_changed);
 786
 787   if (GTK_WIDGET_REALIZED (widget))
 788     {
 789       GtkAllocation view_allocation;
 790
 791       viewport_get_view_allocation (viewport, &view_allocation);
 792
 793       gdk_window_move_resize (widget->window,
 794                               allocation->x + border_width,
 795                               allocation->y + border_width,
 796                               allocation->width - border_width * 2,
 797                               allocation->height - border_width * 2);
 798
 799       gdk_window_move_resize (viewport->view_window,
 800                               view_allocation.x,
 801                               view_allocation.y,
 802                               view_allocation.width,
 803                               view_allocation.height);
 804     }
 805
 806   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 807     {
 808       GtkAllocation child_allocation;
 809
 810       child_allocation.x = 0;
 811       child_allocation.y = 0;
 812       child_allocation.width = hadjustment->upper;
 813       child_allocation.height = vadjustment->upper;
 814
 815       if (GTK_WIDGET_REALIZED (widget))
 816         gdk_window_move_resize (viewport->bin_window,
 817                                 - hadjustment->value,
 818                                 - vadjustment->value,
 819                                 child_allocation.width,
 820                                 child_allocation.height);
 821
 822       gtk_widget_size_allocate (bin->child, &child_allocation);
 823     }
 824
 825   gtk_adjustment_changed (hadjustment);
 826   gtk_adjustment_changed (vadjustment);
 827   if (hadjustment_value_changed)
 828     gtk_adjustment_value_changed (hadjustment);
 829   if (vadjustment_value_changed)
 830     gtk_adjustment_value_changed (vadjustment);
 831 }
 832
 833 static void
 834 gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
 835                                        gpointer       data)
 836 {
 837   GtkViewport *viewport;
 838   GtkBin *bin;
 839
 840   g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 841   g_return_if_fail (GTK_IS_VIEWPORT (data));
 842
 843   viewport = GTK_VIEWPORT (data);
 844   bin = GTK_BIN (data);
 845
 846   if (bin->child && GTK_WIDGET_VISIBLE (bin->child)  &&
 847       GTK_WIDGET_REALIZED (viewport))
 848     {
 849       GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 850       GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 851       gint old_x, old_y;
 852       gint new_x, new_y;
 853
 854       gdk_window_get_position (viewport->bin_window, &old_x, &old_y);
 855       new_x = - hadjustment->value;
 856       new_y = - vadjustment->value;
 857
 858       if (new_x != old_x || new_y != old_y)
 859         {
 860           gdk_window_move (viewport->bin_window, new_x, new_y);
 861           gdk_window_process_updates (viewport->bin_window, TRUE);
 862         }
 863     }
 864 }
 865
 866 static void
 867 gtk_viewport_style_set (GtkWidget *widget,
 868                         GtkStyle  *previous_style)
 869 {
 870    GtkViewport *viewport;
 871
 872    if (GTK_WIDGET_REALIZED (widget) &&
 873        !GTK_WIDGET_NO_WINDOW (widget))
 874      {
 875         viewport = GTK_VIEWPORT (widget);
 876
 877         gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 878         gtk_style_set_background (widget->style, widget->window, widget->state);
 879      }
 880 }