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 "gtkviewport.h"
  28 #include "gtkintl.h"
  29 #include "gtkmarshalers.h"
  30
  31 enum {
  32   PROP_0,
  33   PROP_HADJUSTMENT,
  34   PROP_VADJUSTMENT,
  35   PROP_SHADOW_TYPE
  36 };
  37
  38
  39 static void gtk_viewport_class_init               (GtkViewportClass *klass);
  40 static void gtk_viewport_init                     (GtkViewport      *viewport);
  41 static void gtk_viewport_finalize                 (GObject          *object);
  42 static void gtk_viewport_destroy                  (GtkObject        *object);
  43 static void gtk_viewport_set_property             (GObject         *object,
  44                                                    guint            prop_id,
  45                                                    const GValue    *value,
  46                                                    GParamSpec      *pspec);
  47 static void gtk_viewport_get_property             (GObject         *object,
  48                                                    guint            prop_id,
  49                                                    GValue          *value,
  50                                                    GParamSpec      *pspec);
  51 static void gtk_viewport_set_scroll_adjustments   (GtkViewport      *viewport,
  52                                                    GtkAdjustment    *hadjustment,
  53                                                    GtkAdjustment    *vadjustment);
  54 static void gtk_viewport_realize                  (GtkWidget        *widget);
  55 static void gtk_viewport_unrealize                (GtkWidget        *widget);
  56 static void gtk_viewport_paint                    (GtkWidget        *widget,
  57                                                    GdkRectangle     *area);
  58 static gint gtk_viewport_expose                   (GtkWidget        *widget,
  59                                                    GdkEventExpose   *event);
  60 static void gtk_viewport_add                      (GtkContainer     *container,
  61                                                    GtkWidget        *widget);
  62 static void gtk_viewport_size_request             (GtkWidget        *widget,
  63                                                    GtkRequisition   *requisition);
  64 static void gtk_viewport_size_allocate            (GtkWidget        *widget,
  65                                                    GtkAllocation    *allocation);
  66 static void gtk_viewport_adjustment_value_changed (GtkAdjustment    *adjustment,
  67                                                    gpointer          data);
  68 static void gtk_viewport_style_set                (GtkWidget *widget,
  69                                                    GtkStyle  *previous_style);
  70
  71 static GtkBinClass *parent_class;
  72
  73 GType
  74 gtk_viewport_get_type (void)
  75 {
  76   static GType viewport_type = 0;
  77
  78   if (!viewport_type)
  79     {
  80       static const GTypeInfo viewport_info =
  81       {
  82         sizeof (GtkViewportClass),
  83         NULL,           /* base_init */
  84         NULL,           /* base_finalize */
  85         (GClassInitFunc) gtk_viewport_class_init,
  86         NULL,           /* class_finalize */
  87         NULL,           /* class_data */
  88         sizeof (GtkViewport),
  89         0,              /* n_preallocs */
  90         (GInstanceInitFunc) gtk_viewport_init,
  91       };
  92
  93       viewport_type = g_type_register_static (GTK_TYPE_BIN, "GtkViewport",
  94                                               &viewport_info, 0);
  95     }
  96
  97   return viewport_type;
  98 }
  99
 100 static void
 101 gtk_viewport_class_init (GtkViewportClass *class)
 102 {
 103   GtkObjectClass *object_class;
 104   GObjectClass   *gobject_class;
 105   GtkWidgetClass *widget_class;
 106   GtkContainerClass *container_class;
 107
 108   object_class = (GtkObjectClass*) class;
 109   gobject_class = G_OBJECT_CLASS (class);
 110   widget_class = (GtkWidgetClass*) class;
 111   container_class = (GtkContainerClass*) class;
 112
 113   parent_class = g_type_class_peek_parent (class);
 114
 115   gobject_class->finalize = gtk_viewport_finalize;
 116   gobject_class->set_property = gtk_viewport_set_property;
 117   gobject_class->get_property = gtk_viewport_get_property;
 118   object_class->destroy = gtk_viewport_destroy;
 119
 120   widget_class->realize = gtk_viewport_realize;
 121   widget_class->unrealize = gtk_viewport_unrealize;
 122   widget_class->expose_event = gtk_viewport_expose;
 123   widget_class->size_request = gtk_viewport_size_request;
 124   widget_class->size_allocate = gtk_viewport_size_allocate;
 125   widget_class->style_set = gtk_viewport_style_set;
 126
 127   container_class->add = gtk_viewport_add;
 128
 129   class->set_scroll_adjustments = gtk_viewport_set_scroll_adjustments;
 130
 131   g_object_class_install_property (gobject_class,
 132                                    PROP_HADJUSTMENT,
 133                                    g_param_spec_object ("hadjustment",
 134                                                         P_("Horizontal adjustment"),
 135                                                         P_("The GtkAdjustment that determines the values of the horizontal position for this viewport"),
 136                                                         GTK_TYPE_ADJUSTMENT,
 137                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 138
 139   g_object_class_install_property (gobject_class,
 140                                    PROP_VADJUSTMENT,
 141                                    g_param_spec_object ("vadjustment",
 142                                                         P_("Vertical adjustment"),
 143                                                         P_("The GtkAdjustment that determines the values of the vertical position for this viewport"),
 144                                                         GTK_TYPE_ADJUSTMENT,
 145                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 146
 147   g_object_class_install_property (gobject_class,
 148                                    PROP_SHADOW_TYPE,
 149                                    g_param_spec_enum ("shadow_type",
 150                                                       P_("Shadow type"),
 151                                                       P_("Determines how the shadowed box around the viewport is drawn"),
 152                                                       GTK_TYPE_SHADOW_TYPE,
 153                                                       GTK_SHADOW_IN,
 154                                                       G_PARAM_READWRITE));
 155
 156   widget_class->set_scroll_adjustments_signal =
 157     g_signal_new ("set_scroll_adjustments",
 158                   G_OBJECT_CLASS_TYPE (gobject_class),
 159                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 160                   G_STRUCT_OFFSET (GtkViewportClass, set_scroll_adjustments),
 161                   NULL, NULL,
 162                   _gtk_marshal_VOID__OBJECT_OBJECT,
 163                   G_TYPE_NONE, 2,
 164                   GTK_TYPE_ADJUSTMENT,
 165                   GTK_TYPE_ADJUSTMENT);
 166 }
 167
 168 static void
 169 gtk_viewport_set_property (GObject         *object,
 170                            guint            prop_id,
 171                            const GValue    *value,
 172                            GParamSpec      *pspec)
 173 {
 174   GtkViewport *viewport;
 175
 176   viewport = GTK_VIEWPORT (object);
 177
 178   switch (prop_id)
 179     {
 180     case PROP_HADJUSTMENT:
 181       gtk_viewport_set_hadjustment (viewport, g_value_get_object (value));
 182       break;
 183     case PROP_VADJUSTMENT:
 184       gtk_viewport_set_vadjustment (viewport, g_value_get_object (value));
 185       break;
 186     case PROP_SHADOW_TYPE:
 187       gtk_viewport_set_shadow_type (viewport, g_value_get_enum (value));
 188       break;
 189     default:
 190       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 191       break;
 192     }
 193 }
 194
 195 static void
 196 gtk_viewport_get_property (GObject         *object,
 197                            guint            prop_id,
 198                            GValue          *value,
 199                            GParamSpec      *pspec)
 200 {
 201   GtkViewport *viewport;
 202
 203   viewport = GTK_VIEWPORT (object);
 204
 205   switch (prop_id)
 206     {
 207     case PROP_HADJUSTMENT:
 208       g_value_set_object (value, viewport->hadjustment);
 209       break;
 210     case PROP_VADJUSTMENT:
 211       g_value_set_object (value, viewport->vadjustment);
 212       break;
 213     case PROP_SHADOW_TYPE:
 214       g_value_set_enum (value, viewport->shadow_type);
 215       break;
 216     default:
 217       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 218       break;
 219     }
 220 }
 221
 222 static void
 223 gtk_viewport_init (GtkViewport *viewport)
 224 {
 225   GTK_WIDGET_UNSET_FLAGS (viewport, GTK_NO_WINDOW);
 226
 227   gtk_widget_set_redraw_on_allocate (GTK_WIDGET (viewport), FALSE);
 228   gtk_container_set_resize_mode (GTK_CONTAINER (viewport), GTK_RESIZE_QUEUE);
 229
 230   viewport->shadow_type = GTK_SHADOW_IN;
 231   viewport->view_window = NULL;
 232   viewport->bin_window = NULL;
 233   viewport->hadjustment = NULL;
 234   viewport->vadjustment = NULL;
 235 }
 236
 237 /**
 238  * gtk_viewport_new:
 239  * @hadjustment: horizontal adjustment.
 240  * @vadjustment: vertical adjustment.
 241  * @returns: a new #GtkViewport.
 242  *
 243  * Creates a new #GtkViewport with the given adjustments.
 244  *
 245  **/
 246 GtkWidget*
 247 gtk_viewport_new (GtkAdjustment *hadjustment,
 248                   GtkAdjustment *vadjustment)
 249 {
 250   GtkWidget *viewport;
 251
 252   viewport = gtk_widget_new (GTK_TYPE_VIEWPORT,
 253                              "hadjustment", hadjustment,
 254                              "vadjustment", vadjustment,
 255                              NULL);
 256
 257   return viewport;
 258 }
 259
 260 #define ADJUSTMENT_POINTER(viewport, orientation)         \
 261   (((orientation) == GTK_ORIENTATION_HORIZONTAL) ?        \
 262      &(viewport)->hadjustment : &(viewport)->vadjustment)
 263
 264 static void
 265 viewport_disconnect_adjustment (GtkViewport    *viewport,
 266                                 GtkOrientation  orientation)
 267 {
 268   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 269
 270   if (*adjustmentp)
 271     {
 272       g_signal_handlers_disconnect_by_func (*adjustmentp,
 273                                             gtk_viewport_adjustment_value_changed,
 274                                             viewport);
 275       g_object_unref (*adjustmentp);
 276       *adjustmentp = NULL;
 277     }
 278 }
 279
 280 static void
 281 gtk_viewport_finalize (GObject *object)
 282 {
 283   GtkViewport *viewport = GTK_VIEWPORT (object);
 284
 285   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
 286   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
 287
 288   G_OBJECT_CLASS (parent_class)->finalize (object);
 289 }
 290
 291 static void
 292 gtk_viewport_destroy (GtkObject *object)
 293 {
 294   GtkViewport *viewport = GTK_VIEWPORT (object);
 295
 296   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
 297   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
 298
 299   GTK_OBJECT_CLASS (parent_class)->destroy (object);
 300 }
 301
 302 /**
 303  * gtk_viewport_get_hadjustment:
 304  * @viewport: a #GtkViewport.
 305  *
 306  * Returns the horizontal adjustment of the viewport.
 307  *
 308  * Return value: the horizontal adjustment of @viewport.
 309  **/
 310 GtkAdjustment*
 311 gtk_viewport_get_hadjustment (GtkViewport *viewport)
 312 {
 313   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 314
 315   if (!viewport->hadjustment)
 316     gtk_viewport_set_hadjustment (viewport, NULL);
 317
 318   return viewport->hadjustment;
 319 }
 320
 321 /**
 322  * gtk_viewport_get_vadjustment:
 323  * @viewport: a #GtkViewport.
 324  *
 325  * Returns the vertical adjustment of the viewport.
 326  *
 327  * Return value: the vertical adjustment of @viewport.
 328  **/
 329 GtkAdjustment*
 330 gtk_viewport_get_vadjustment (GtkViewport *viewport)
 331 {
 332   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 333
 334   if (!viewport->vadjustment)
 335     gtk_viewport_set_vadjustment (viewport, NULL);
 336
 337   return viewport->vadjustment;
 338 }
 339
 340 static void
 341 viewport_get_view_allocation (GtkViewport   *viewport,
 342                               GtkAllocation *view_allocation)
 343 {
 344   GtkWidget *widget = GTK_WIDGET (viewport);
 345   GtkAllocation *allocation = &widget->allocation;
 346   gint border_width = GTK_CONTAINER (viewport)->border_width;
 347
 348   view_allocation->x = 0;
 349   view_allocation->y = 0;
 350
 351   if (viewport->shadow_type != GTK_SHADOW_NONE)
 352     {
 353       view_allocation->x = widget->style->xthickness;
 354       view_allocation->y = widget->style->ythickness;
 355     }
 356
 357   view_allocation->width = MAX (1, allocation->width - view_allocation->x * 2 - border_width * 2);
 358   view_allocation->height = MAX (1, allocation->height - view_allocation->y * 2 - border_width * 2);
 359 }
 360
 361 static void
 362 viewport_reclamp_adjustment (GtkAdjustment *adjustment,
 363                              gboolean      *value_changed)
 364 {
 365   gdouble value = adjustment->value;
 366
 367   value = CLAMP (value, 0, adjustment->upper - adjustment->page_size);
 368   if (value != adjustment->value)
 369     {
 370       adjustment->value = value;
 371       if (value_changed)
 372         *value_changed = TRUE;
 373     }
 374   else if (value_changed)
 375     *value_changed = FALSE;
 376 }
 377
 378 static void
 379 viewport_set_hadjustment_values (GtkViewport *viewport,
 380                                  gboolean    *value_changed)
 381 {
 382   GtkBin *bin = GTK_BIN (viewport);
 383   GtkAllocation view_allocation;
 384   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 385   gdouble old_page_size;
 386   gdouble old_upper;
 387   gdouble old_value;
 388
 389   viewport_get_view_allocation (viewport, &view_allocation);
 390
 391   old_page_size = hadjustment->page_size;
 392   old_upper = hadjustment->upper;
 393   old_value = hadjustment->value;
 394   hadjustment->page_size = view_allocation.width;
 395   hadjustment->step_increment = view_allocation.width * 0.1;
 396   hadjustment->page_increment = view_allocation.width * 0.9;
 397
 398   hadjustment->lower = 0;
 399
 400   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 401     {
 402       GtkRequisition child_requisition;
 403
 404       gtk_widget_get_child_requisition (bin->child, &child_requisition);
 405       hadjustment->upper = MAX (child_requisition.width, view_allocation.width);
 406     }
 407   else
 408     hadjustment->upper = view_allocation.width;
 409
 410   if (gtk_widget_get_direction (GTK_WIDGET (viewport)) == GTK_TEXT_DIR_RTL)
 411     {
 412       gdouble dist = old_upper - (old_value + old_page_size);
 413       hadjustment->value = hadjustment->upper - dist - hadjustment->page_size;
 414       viewport_reclamp_adjustment (hadjustment, value_changed);
 415       *value_changed = (old_value != hadjustment->value);
 416     }
 417   else
 418     viewport_reclamp_adjustment (hadjustment, value_changed);
 419 }
 420
 421 static void
 422 viewport_set_vadjustment_values (GtkViewport *viewport,
 423                                  gboolean    *value_changed)
 424 {
 425   GtkBin *bin = GTK_BIN (viewport);
 426   GtkAllocation view_allocation;
 427   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 428
 429   viewport_get_view_allocation (viewport, &view_allocation);
 430
 431   vadjustment->page_size = view_allocation.height;
 432   vadjustment->step_increment = view_allocation.height * 0.1;
 433   vadjustment->page_increment = view_allocation.height * 0.9;
 434
 435   vadjustment->lower = 0;
 436
 437   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 438     {
 439       GtkRequisition child_requisition;
 440
 441       gtk_widget_get_child_requisition (bin->child, &child_requisition);
 442       vadjustment->upper = MAX (child_requisition.height, view_allocation.height);
 443     }
 444   else
 445     vadjustment->upper = view_allocation.height;
 446
 447   viewport_reclamp_adjustment (vadjustment, value_changed);
 448 }
 449
 450 static void
 451 viewport_set_adjustment (GtkViewport    *viewport,
 452                          GtkOrientation  orientation,
 453                          GtkAdjustment  *adjustment)
 454 {
 455   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 456   gboolean value_changed;
 457
 458   if (adjustment && adjustment == *adjustmentp)
 459     return;
 460
 461   if (!adjustment)
 462     adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
 463                                                      0.0, 0.0, 0.0));
 464
 465   *adjustmentp = adjustment;
 466   g_object_ref (adjustment);
 467   gtk_object_sink (GTK_OBJECT (adjustment));
 468
 469   if (orientation == GTK_ORIENTATION_HORIZONTAL)
 470     viewport_set_hadjustment_values (viewport, &value_changed);
 471   else
 472     viewport_set_vadjustment_values (viewport, &value_changed);
 473
 474   g_signal_connect (adjustment, "value_changed",
 475                     G_CALLBACK (gtk_viewport_adjustment_value_changed),
 476                     viewport);
 477
 478   gtk_adjustment_changed (adjustment);
 479
 480   if (value_changed)
 481     gtk_adjustment_value_changed (adjustment);
 482   else
 483     gtk_viewport_adjustment_value_changed (adjustment, viewport);
 484 }
 485
 486 /**
 487  * gtk_viewport_set_hadjustment:
 488  * @viewport: a #GtkViewport.
 489  * @adjustment: a #GtkAdjustment.
 490  *
 491  * Sets the horizontal adjustment of the viewport.
 492  **/
 493 void
 494 gtk_viewport_set_hadjustment (GtkViewport   *viewport,
 495                               GtkAdjustment *adjustment)
 496 {
 497   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 498   if (adjustment)
 499     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 500
 501   viewport_set_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL, adjustment);
 502
 503   g_object_notify (G_OBJECT (viewport), "hadjustment");
 504 }
 505
 506 /**
 507  * gtk_viewport_set_vadjustment:
 508  * @viewport: a #GtkViewport.
 509  * @adjustment: a #GtkAdjustment.
 510  *
 511  * Sets the vertical adjustment of the viewport.
 512  **/
 513 void
 514 gtk_viewport_set_vadjustment (GtkViewport   *viewport,
 515                               GtkAdjustment *adjustment)
 516 {
 517   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 518   if (adjustment)
 519     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 520
 521   viewport_set_adjustment (viewport, GTK_ORIENTATION_VERTICAL, adjustment);
 522
 523   g_object_notify (G_OBJECT (viewport), "vadjustment");
 524 }
 525
 526 static void
 527 gtk_viewport_set_scroll_adjustments (GtkViewport      *viewport,
 528                                      GtkAdjustment    *hadjustment,
 529                                      GtkAdjustment    *vadjustment)
 530 {
 531   gtk_viewport_set_hadjustment (viewport, hadjustment);
 532   gtk_viewport_set_vadjustment (viewport, vadjustment);
 533 }
 534
 535 /**
 536  * gtk_viewport_set_shadow_type:
 537  * @viewport: a #GtkViewport.
 538  * @type: the new shadow type.
 539  *
 540  * Sets the shadow type of the viewport.
 541  **/
 542 void
 543 gtk_viewport_set_shadow_type (GtkViewport   *viewport,
 544                               GtkShadowType  type)
 545 {
 546   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 547
 548   if ((GtkShadowType) viewport->shadow_type != type)
 549     {
 550       viewport->shadow_type = type;
 551
 552       if (GTK_WIDGET_VISIBLE (viewport))
 553         {
 554           gtk_widget_size_allocate (GTK_WIDGET (viewport), &(GTK_WIDGET (viewport)->allocation));
 555           gtk_widget_queue_draw (GTK_WIDGET (viewport));
 556         }
 557
 558       g_object_notify (G_OBJECT (viewport), "shadow_type");
 559     }
 560 }
 561
 562 /**
 563  * gtk_viewport_get_shadow_type:
 564  * @viewport: a #GtkViewport
 565  *
 566  * Gets the shadow type of the #GtkViewport. See
 567  * gtk_viewport_set_shadow_type().
 568
 569  * Return value: the shadow type
 570  **/
 571 GtkShadowType
 572 gtk_viewport_get_shadow_type (GtkViewport *viewport)
 573 {
 574   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), GTK_SHADOW_NONE);
 575
 576   return viewport->shadow_type;
 577 }
 578
 579 static void
 580 gtk_viewport_realize (GtkWidget *widget)
 581 {
 582   GtkViewport *viewport = GTK_VIEWPORT (widget);
 583   GtkBin *bin = GTK_BIN (widget);
 584   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 585   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 586   gint border_width = GTK_CONTAINER (widget)->border_width;
 587
 588   GtkAllocation view_allocation;
 589   GdkWindowAttr attributes;
 590   gint attributes_mask;
 591   gint event_mask;
 592
 593   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 594
 595   attributes.x = widget->allocation.x + border_width;
 596   attributes.y = widget->allocation.y + border_width;
 597   attributes.width = widget->allocation.width - border_width * 2;
 598   attributes.height = widget->allocation.height - border_width * 2;
 599   attributes.window_type = GDK_WINDOW_CHILD;
 600   attributes.wclass = GDK_INPUT_OUTPUT;
 601   attributes.visual = gtk_widget_get_visual (widget);
 602   attributes.colormap = gtk_widget_get_colormap (widget);
 603
 604   event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 605   /* We select on button_press_mask so that button 4-5 scrolls are trapped.
 606    */
 607   attributes.event_mask = event_mask | GDK_BUTTON_PRESS_MASK;
 608
 609   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 610
 611   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 612                                    &attributes, attributes_mask);
 613   gdk_window_set_user_data (widget->window, viewport);
 614
 615   viewport_get_view_allocation (viewport, &view_allocation);
 616
 617   attributes.x = view_allocation.x;
 618   attributes.y = view_allocation.y;
 619   attributes.width = view_allocation.width;
 620   attributes.height = view_allocation.height;
 621   attributes.event_mask = 0;
 622
 623   viewport->view_window = gdk_window_new (widget->window, &attributes, attributes_mask);
 624   gdk_window_set_user_data (viewport->view_window, viewport);
 625
 626   attributes.x = - hadjustment->value;
 627   attributes.y = - vadjustment->value;
 628   attributes.width = hadjustment->upper;
 629   attributes.height = vadjustment->upper;
 630
 631   attributes.event_mask = event_mask;
 632
 633   viewport->bin_window = gdk_window_new (viewport->view_window, &attributes, attributes_mask);
 634   gdk_window_set_user_data (viewport->bin_window, viewport);
 635
 636   if (bin->child)
 637     gtk_widget_set_parent_window (bin->child, viewport->bin_window);
 638
 639   widget->style = gtk_style_attach (widget->style, widget->window);
 640   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 641   gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 642
 643   /* Call paint here to allow a theme to set the background without flashing
 644    */
 645   gtk_paint_flat_box(widget->style, viewport->bin_window, GTK_STATE_NORMAL,
 646                      GTK_SHADOW_NONE,
 647                      NULL, widget, "viewportbin",
 648                      0, 0, -1, -1);
 649
 650   gdk_window_show (viewport->bin_window);
 651   gdk_window_show (viewport->view_window);
 652 }
 653
 654 static void
 655 gtk_viewport_unrealize (GtkWidget *widget)
 656 {
 657   GtkViewport *viewport = GTK_VIEWPORT (widget);
 658
 659   gdk_window_set_user_data (viewport->view_window, NULL);
 660   gdk_window_destroy (viewport->view_window);
 661   viewport->view_window = NULL;
 662
 663   gdk_window_set_user_data (viewport->bin_window, NULL);
 664   gdk_window_destroy (viewport->bin_window);
 665   viewport->bin_window = NULL;
 666
 667   if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 668     (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 669 }
 670
 671 static void
 672 gtk_viewport_paint (GtkWidget    *widget,
 673                     GdkRectangle *area)
 674 {
 675   GtkViewport *viewport;
 676
 677   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 678   g_return_if_fail (area != NULL);
 679
 680   if (GTK_WIDGET_DRAWABLE (widget))
 681     {
 682       viewport = GTK_VIEWPORT (widget);
 683
 684       gtk_paint_shadow (widget->style, widget->window,
 685                         GTK_STATE_NORMAL, viewport->shadow_type,
 686                         NULL, widget, "viewport",
 687                         0, 0, -1, -1);
 688     }
 689 }
 690
 691 static gint
 692 gtk_viewport_expose (GtkWidget      *widget,
 693                      GdkEventExpose *event)
 694 {
 695   GtkViewport *viewport;
 696   GtkBin *bin;
 697
 698   if (GTK_WIDGET_DRAWABLE (widget))
 699     {
 700       viewport = GTK_VIEWPORT (widget);
 701       bin = GTK_BIN (widget);
 702
 703       if (event->window == widget->window)
 704         gtk_viewport_paint (widget, &event->area);
 705       else if (event->window == viewport->bin_window)
 706         {
 707           gtk_paint_flat_box(widget->style, viewport->bin_window,
 708                              GTK_STATE_NORMAL, GTK_SHADOW_NONE,
 709                              &event->area, widget, "viewportbin",
 710                              0, 0, -1, -1);
 711
 712           (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
 713         }
 714     }
 715
 716   return FALSE;
 717 }
 718
 719 static void
 720 gtk_viewport_add (GtkContainer *container,
 721                   GtkWidget    *child)
 722 {
 723   GtkBin *bin;
 724
 725   g_return_if_fail (GTK_IS_WIDGET (child));
 726
 727   bin = GTK_BIN (container);
 728   g_return_if_fail (bin->child == NULL);
 729
 730   gtk_widget_set_parent_window (child, GTK_VIEWPORT (bin)->bin_window);
 731
 732   GTK_CONTAINER_CLASS (parent_class)->add (container, child);
 733 }
 734
 735 static void
 736 gtk_viewport_size_request (GtkWidget      *widget,
 737                            GtkRequisition *requisition)
 738 {
 739   GtkViewport *viewport;
 740   GtkBin *bin;
 741   GtkRequisition child_requisition;
 742
 743   viewport = GTK_VIEWPORT (widget);
 744   bin = GTK_BIN (widget);
 745
 746   requisition->width = (GTK_CONTAINER (widget)->border_width +
 747                         GTK_WIDGET (widget)->style->xthickness) * 2;
 748
 749   requisition->height = (GTK_CONTAINER (widget)->border_width * 2 +
 750                          GTK_WIDGET (widget)->style->ythickness) * 2;
 751
 752   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 753     {
 754       gtk_widget_size_request (bin->child, &child_requisition);
 755       requisition->width += child_requisition.width;
 756       requisition->height += child_requisition.height;
 757     }
 758 }
 759
 760 static void
 761 gtk_viewport_size_allocate (GtkWidget     *widget,
 762                             GtkAllocation *allocation)
 763 {
 764   GtkViewport *viewport = GTK_VIEWPORT (widget);
 765   GtkBin *bin = GTK_BIN (widget);
 766   gint border_width = GTK_CONTAINER (widget)->border_width;
 767   gboolean hadjustment_value_changed, vadjustment_value_changed;
 768
 769   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 770   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 771
 772   /* If our size changed, and we have a shadow, queue a redraw on widget->window to
 773    * redraw the shadow correctly.
 774    */
 775   if (GTK_WIDGET_MAPPED (widget) &&
 776       viewport->shadow_type != GTK_SHADOW_NONE &&
 777       (widget->allocation.width != allocation->width ||
 778        widget->allocation.height != allocation->height))
 779     gdk_window_invalidate_rect (widget->window, NULL, FALSE);
 780
 781   widget->allocation = *allocation;
 782
 783   viewport_set_hadjustment_values (viewport, &hadjustment_value_changed);
 784   viewport_set_vadjustment_values (viewport, &vadjustment_value_changed);
 785
 786   if (GTK_WIDGET_REALIZED (widget))
 787     {
 788       GtkAllocation view_allocation;
 789
 790       viewport_get_view_allocation (viewport, &view_allocation);
 791
 792       gdk_window_move_resize (widget->window,
 793                               allocation->x + border_width,
 794                               allocation->y + border_width,
 795                               allocation->width - border_width * 2,
 796                               allocation->height - border_width * 2);
 797
 798       gdk_window_move_resize (viewport->view_window,
 799                               view_allocation.x,
 800                               view_allocation.y,
 801                               view_allocation.width,
 802                               view_allocation.height);
 803     }
 804
 805   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 806     {
 807       GtkAllocation child_allocation;
 808
 809       child_allocation.x = 0;
 810       child_allocation.y = 0;
 811       child_allocation.width = hadjustment->upper;
 812       child_allocation.height = vadjustment->upper;
 813
 814       if (GTK_WIDGET_REALIZED (widget))
 815         gdk_window_move_resize (viewport->bin_window,
 816                                 - hadjustment->value,
 817                                 - vadjustment->value,
 818                                 child_allocation.width,
 819                                 child_allocation.height);
 820
 821       gtk_widget_size_allocate (bin->child, &child_allocation);
 822     }
 823
 824   gtk_adjustment_changed (hadjustment);
 825   gtk_adjustment_changed (vadjustment);
 826   if (hadjustment_value_changed)
 827     gtk_adjustment_value_changed (hadjustment);
 828   if (vadjustment_value_changed)
 829     gtk_adjustment_value_changed (vadjustment);
 830 }
 831
 832 static void
 833 gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
 834                                        gpointer       data)
 835 {
 836   GtkViewport *viewport;
 837   GtkBin *bin;
 838
 839   g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 840   g_return_if_fail (GTK_IS_VIEWPORT (data));
 841
 842   viewport = GTK_VIEWPORT (data);
 843   bin = GTK_BIN (data);
 844
 845   if (bin->child && GTK_WIDGET_VISIBLE (bin->child)  &&
 846       GTK_WIDGET_REALIZED (viewport))
 847     {
 848       GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 849       GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 850       gint old_x, old_y;
 851       gint new_x, new_y;
 852
 853       gdk_window_get_position (viewport->bin_window, &old_x, &old_y);
 854       new_x = - hadjustment->value;
 855       new_y = - vadjustment->value;
 856
 857       if (new_x != old_x || new_y != old_y)
 858         {
 859           gdk_window_move (viewport->bin_window, new_x, new_y);
 860           gdk_window_process_updates (viewport->bin_window, TRUE);
 861         }
 862     }
 863 }
 864
 865 static void
 866 gtk_viewport_style_set (GtkWidget *widget,
 867                         GtkStyle  *previous_style)
 868 {
 869    GtkViewport *viewport;
 870
 871    if (GTK_WIDGET_REALIZED (widget) &&
 872        !GTK_WIDGET_NO_WINDOW (widget))
 873      {
 874         viewport = GTK_VIEWPORT (widget);
 875
 876         gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 877         gtk_style_set_background (widget->style, widget->window, widget->state);
 878      }
 879 }