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