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   /**
 129    * GtkViewport::set-scroll-adjustments
 130    * @horizontal: the horizontal #GtkAdjustment
 131    * @vertical: the vertical #GtkAdjustment
 132    *
 133    * Set the scroll adjustments for the viewport. Usually scrolled containers
 134    * like #GtkScrolledWindow will emit this signal to connect two instances
 135    * of #GtkScrollbar to the scroll directions of the #GtkViewport.
 136    */
 137   widget_class->set_scroll_adjustments_signal =
 138     g_signal_new (I_("set-scroll-adjustments"),
 139                   G_OBJECT_CLASS_TYPE (gobject_class),
 140                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 141                   G_STRUCT_OFFSET (GtkViewportClass, set_scroll_adjustments),
 142                   NULL, NULL,
 143                   _gtk_marshal_VOID__OBJECT_OBJECT,
 144                   G_TYPE_NONE, 2,
 145                   GTK_TYPE_ADJUSTMENT,
 146                   GTK_TYPE_ADJUSTMENT);
 147 }
 148
 149 static void
 150 gtk_viewport_set_property (GObject         *object,
 151                            guint            prop_id,
 152                            const GValue    *value,
 153                            GParamSpec      *pspec)
 154 {
 155   GtkViewport *viewport;
 156
 157   viewport = GTK_VIEWPORT (object);
 158
 159   switch (prop_id)
 160     {
 161     case PROP_HADJUSTMENT:
 162       gtk_viewport_set_hadjustment (viewport, g_value_get_object (value));
 163       break;
 164     case PROP_VADJUSTMENT:
 165       gtk_viewport_set_vadjustment (viewport, g_value_get_object (value));
 166       break;
 167     case PROP_SHADOW_TYPE:
 168       gtk_viewport_set_shadow_type (viewport, g_value_get_enum (value));
 169       break;
 170     default:
 171       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 172       break;
 173     }
 174 }
 175
 176 static void
 177 gtk_viewport_get_property (GObject         *object,
 178                            guint            prop_id,
 179                            GValue          *value,
 180                            GParamSpec      *pspec)
 181 {
 182   GtkViewport *viewport;
 183
 184   viewport = GTK_VIEWPORT (object);
 185
 186   switch (prop_id)
 187     {
 188     case PROP_HADJUSTMENT:
 189       g_value_set_object (value, viewport->hadjustment);
 190       break;
 191     case PROP_VADJUSTMENT:
 192       g_value_set_object (value, viewport->vadjustment);
 193       break;
 194     case PROP_SHADOW_TYPE:
 195       g_value_set_enum (value, viewport->shadow_type);
 196       break;
 197     default:
 198       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 199       break;
 200     }
 201 }
 202
 203 static void
 204 gtk_viewport_init (GtkViewport *viewport)
 205 {
 206   GTK_WIDGET_UNSET_FLAGS (viewport, GTK_NO_WINDOW);
 207
 208   gtk_widget_set_redraw_on_allocate (GTK_WIDGET (viewport), FALSE);
 209   gtk_container_set_resize_mode (GTK_CONTAINER (viewport), GTK_RESIZE_QUEUE);
 210
 211   viewport->shadow_type = GTK_SHADOW_IN;
 212   viewport->view_window = NULL;
 213   viewport->bin_window = NULL;
 214   viewport->hadjustment = NULL;
 215   viewport->vadjustment = NULL;
 216 }
 217
 218 /**
 219  * gtk_viewport_new:
 220  * @hadjustment: horizontal adjustment.
 221  * @vadjustment: vertical adjustment.
 222  * @returns: a new #GtkViewport.
 223  *
 224  * Creates a new #GtkViewport with the given adjustments.
 225  *
 226  **/
 227 GtkWidget*
 228 gtk_viewport_new (GtkAdjustment *hadjustment,
 229                   GtkAdjustment *vadjustment)
 230 {
 231   GtkWidget *viewport;
 232
 233   viewport = g_object_new (GTK_TYPE_VIEWPORT,
 234                              "hadjustment", hadjustment,
 235                              "vadjustment", vadjustment,
 236                              NULL);
 237
 238   return viewport;
 239 }
 240
 241 #define ADJUSTMENT_POINTER(viewport, orientation)         \
 242   (((orientation) == GTK_ORIENTATION_HORIZONTAL) ?        \
 243      &(viewport)->hadjustment : &(viewport)->vadjustment)
 244
 245 static void
 246 viewport_disconnect_adjustment (GtkViewport    *viewport,
 247                                 GtkOrientation  orientation)
 248 {
 249   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 250
 251   if (*adjustmentp)
 252     {
 253       g_signal_handlers_disconnect_by_func (*adjustmentp,
 254                                             gtk_viewport_adjustment_value_changed,
 255                                             viewport);
 256       g_object_unref (*adjustmentp);
 257       *adjustmentp = NULL;
 258     }
 259 }
 260
 261 static void
 262 gtk_viewport_finalize (GObject *object)
 263 {
 264   GtkViewport *viewport = GTK_VIEWPORT (object);
 265
 266   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
 267   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
 268
 269   G_OBJECT_CLASS (gtk_viewport_parent_class)->finalize (object);
 270 }
 271
 272 static void
 273 gtk_viewport_destroy (GtkObject *object)
 274 {
 275   GtkViewport *viewport = GTK_VIEWPORT (object);
 276
 277   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
 278   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
 279
 280   GTK_OBJECT_CLASS (gtk_viewport_parent_class)->destroy (object);
 281 }
 282
 283 /**
 284  * gtk_viewport_get_hadjustment:
 285  * @viewport: a #GtkViewport.
 286  *
 287  * Returns the horizontal adjustment of the viewport.
 288  *
 289  * Return value: the horizontal adjustment of @viewport.
 290  **/
 291 GtkAdjustment*
 292 gtk_viewport_get_hadjustment (GtkViewport *viewport)
 293 {
 294   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 295
 296   if (!viewport->hadjustment)
 297     gtk_viewport_set_hadjustment (viewport, NULL);
 298
 299   return viewport->hadjustment;
 300 }
 301
 302 /**
 303  * gtk_viewport_get_vadjustment:
 304  * @viewport: a #GtkViewport.
 305  *
 306  * Returns the vertical adjustment of the viewport.
 307  *
 308  * Return value: the vertical adjustment of @viewport.
 309  **/
 310 GtkAdjustment*
 311 gtk_viewport_get_vadjustment (GtkViewport *viewport)
 312 {
 313   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 314
 315   if (!viewport->vadjustment)
 316     gtk_viewport_set_vadjustment (viewport, NULL);
 317
 318   return viewport->vadjustment;
 319 }
 320
 321 static void
 322 viewport_get_view_allocation (GtkViewport   *viewport,
 323                               GtkAllocation *view_allocation)
 324 {
 325   GtkWidget *widget = GTK_WIDGET (viewport);
 326   GtkAllocation *allocation = &widget->allocation;
 327   gint border_width = GTK_CONTAINER (viewport)->border_width;
 328
 329   view_allocation->x = 0;
 330   view_allocation->y = 0;
 331
 332   if (viewport->shadow_type != GTK_SHADOW_NONE)
 333     {
 334       view_allocation->x = widget->style->xthickness;
 335       view_allocation->y = widget->style->ythickness;
 336     }
 337
 338   view_allocation->width = MAX (1, allocation->width - view_allocation->x * 2 - border_width * 2);
 339   view_allocation->height = MAX (1, allocation->height - view_allocation->y * 2 - border_width * 2);
 340 }
 341
 342 static void
 343 viewport_reclamp_adjustment (GtkAdjustment *adjustment,
 344                              gboolean      *value_changed)
 345 {
 346   gdouble value = adjustment->value;
 347
 348   value = CLAMP (value, 0, adjustment->upper - adjustment->page_size);
 349   if (value != adjustment->value)
 350     {
 351       adjustment->value = value;
 352       if (value_changed)
 353         *value_changed = TRUE;
 354     }
 355   else if (value_changed)
 356     *value_changed = FALSE;
 357 }
 358
 359 static void
 360 viewport_set_hadjustment_values (GtkViewport *viewport,
 361                                  gboolean    *value_changed)
 362 {
 363   GtkBin *bin = GTK_BIN (viewport);
 364   GtkAllocation view_allocation;
 365   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 366   gdouble old_page_size;
 367   gdouble old_upper;
 368   gdouble old_value;
 369
 370   viewport_get_view_allocation (viewport, &view_allocation);
 371
 372   old_page_size = hadjustment->page_size;
 373   old_upper = hadjustment->upper;
 374   old_value = hadjustment->value;
 375   hadjustment->page_size = view_allocation.width;
 376   hadjustment->step_increment = view_allocation.width * 0.1;
 377   hadjustment->page_increment = view_allocation.width * 0.9;
 378
 379   hadjustment->lower = 0;
 380
 381   if (bin->child && gtk_widget_get_visible (bin->child))
 382     {
 383       GtkRequisition child_requisition;
 384
 385       gtk_widget_get_child_requisition (bin->child, &child_requisition);
 386       hadjustment->upper = MAX (child_requisition.width, view_allocation.width);
 387     }
 388   else
 389     hadjustment->upper = view_allocation.width;
 390
 391   if (gtk_widget_get_direction (GTK_WIDGET (viewport)) == GTK_TEXT_DIR_RTL)
 392     {
 393       gdouble dist = old_upper - (old_value + old_page_size);
 394       hadjustment->value = hadjustment->upper - dist - hadjustment->page_size;
 395       viewport_reclamp_adjustment (hadjustment, value_changed);
 396       *value_changed = (old_value != hadjustment->value);
 397     }
 398   else
 399     viewport_reclamp_adjustment (hadjustment, value_changed);
 400 }
 401
 402 static void
 403 viewport_set_vadjustment_values (GtkViewport *viewport,
 404                                  gboolean    *value_changed)
 405 {
 406   GtkBin *bin = GTK_BIN (viewport);
 407   GtkAllocation view_allocation;
 408   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 409
 410   viewport_get_view_allocation (viewport, &view_allocation);
 411
 412   vadjustment->page_size = view_allocation.height;
 413   vadjustment->step_increment = view_allocation.height * 0.1;
 414   vadjustment->page_increment = view_allocation.height * 0.9;
 415
 416   vadjustment->lower = 0;
 417
 418   if (bin->child && gtk_widget_get_visible (bin->child))
 419     {
 420       GtkRequisition child_requisition;
 421
 422       gtk_widget_get_child_requisition (bin->child, &child_requisition);
 423       vadjustment->upper = MAX (child_requisition.height, view_allocation.height);
 424     }
 425   else
 426     vadjustment->upper = view_allocation.height;
 427
 428   viewport_reclamp_adjustment (vadjustment, value_changed);
 429 }
 430
 431 static void
 432 viewport_set_adjustment (GtkViewport    *viewport,
 433                          GtkOrientation  orientation,
 434                          GtkAdjustment  *adjustment)
 435 {
 436   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 437   gboolean value_changed;
 438
 439   if (adjustment && adjustment == *adjustmentp)
 440     return;
 441
 442   if (!adjustment)
 443     adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
 444                                                      0.0, 0.0, 0.0));
 445   viewport_disconnect_adjustment (viewport, orientation);
 446   *adjustmentp = adjustment;
 447   g_object_ref_sink (adjustment);
 448
 449   if (orientation == GTK_ORIENTATION_HORIZONTAL)
 450     viewport_set_hadjustment_values (viewport, &value_changed);
 451   else
 452     viewport_set_vadjustment_values (viewport, &value_changed);
 453
 454   g_signal_connect (adjustment, "value-changed",
 455                     G_CALLBACK (gtk_viewport_adjustment_value_changed),
 456                     viewport);
 457
 458   gtk_adjustment_changed (adjustment);
 459
 460   if (value_changed)
 461     gtk_adjustment_value_changed (adjustment);
 462   else
 463     gtk_viewport_adjustment_value_changed (adjustment, viewport);
 464 }
 465
 466 /**
 467  * gtk_viewport_set_hadjustment:
 468  * @viewport: a #GtkViewport.
 469  * @adjustment: (allow-none): a #GtkAdjustment.
 470  *
 471  * Sets the horizontal adjustment of the viewport.
 472  **/
 473 void
 474 gtk_viewport_set_hadjustment (GtkViewport   *viewport,
 475                               GtkAdjustment *adjustment)
 476 {
 477   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 478   if (adjustment)
 479     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 480
 481   viewport_set_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL, adjustment);
 482
 483   g_object_notify (G_OBJECT (viewport), "hadjustment");
 484 }
 485
 486 /**
 487  * gtk_viewport_set_vadjustment:
 488  * @viewport: a #GtkViewport.
 489  * @adjustment: (allow-none): a #GtkAdjustment.
 490  *
 491  * Sets the vertical adjustment of the viewport.
 492  **/
 493 void
 494 gtk_viewport_set_vadjustment (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_VERTICAL, adjustment);
 502
 503   g_object_notify (G_OBJECT (viewport), "vadjustment");
 504 }
 505
 506 static void
 507 gtk_viewport_set_scroll_adjustments (GtkViewport      *viewport,
 508                                      GtkAdjustment    *hadjustment,
 509                                      GtkAdjustment    *vadjustment)
 510 {
 511   gtk_viewport_set_hadjustment (viewport, hadjustment);
 512   gtk_viewport_set_vadjustment (viewport, vadjustment);
 513 }
 514
 515 /**
 516  * gtk_viewport_set_shadow_type:
 517  * @viewport: a #GtkViewport.
 518  * @type: the new shadow type.
 519  *
 520  * Sets the shadow type of the viewport.
 521  **/
 522 void
 523 gtk_viewport_set_shadow_type (GtkViewport   *viewport,
 524                               GtkShadowType  type)
 525 {
 526   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 527
 528   if ((GtkShadowType) viewport->shadow_type != type)
 529     {
 530       viewport->shadow_type = type;
 531
 532       if (gtk_widget_get_visible (GTK_WIDGET (viewport)))
 533         {
 534           gtk_widget_size_allocate (GTK_WIDGET (viewport), &(GTK_WIDGET (viewport)->allocation));
 535           gtk_widget_queue_draw (GTK_WIDGET (viewport));
 536         }
 537
 538       g_object_notify (G_OBJECT (viewport), "shadow-type");
 539     }
 540 }
 541
 542 /**
 543  * gtk_viewport_get_shadow_type:
 544  * @viewport: a #GtkViewport
 545  *
 546  * Gets the shadow type of the #GtkViewport. See
 547  * gtk_viewport_set_shadow_type().
 548
 549  * Return value: the shadow type
 550  **/
 551 GtkShadowType
 552 gtk_viewport_get_shadow_type (GtkViewport *viewport)
 553 {
 554   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), GTK_SHADOW_NONE);
 555
 556   return viewport->shadow_type;
 557 }
 558
 559 /**
 560  * gtk_viewport_get_bin_window:
 561  * @viewport: a #GtkViewport
 562  *
 563  * Gets the bin window of the #GtkViewport.
 564  *
 565  * Return value: a #GdkWindow
 566  *
 567  * Since: 2.20
 568  **/
 569 GdkWindow*
 570 gtk_viewport_get_bin_window (GtkViewport *viewport)
 571 {
 572   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 573
 574   return viewport->bin_window;
 575 }
 576
 577 static void
 578 gtk_viewport_realize (GtkWidget *widget)
 579 {
 580   GtkViewport *viewport = GTK_VIEWPORT (widget);
 581   GtkBin *bin = GTK_BIN (widget);
 582   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 583   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 584   gint border_width = GTK_CONTAINER (widget)->border_width;
 585
 586   GtkAllocation view_allocation;
 587   GdkWindowAttr attributes;
 588   gint attributes_mask;
 589   gint event_mask;
 590
 591   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 592
 593   attributes.x = widget->allocation.x + border_width;
 594   attributes.y = widget->allocation.y + border_width;
 595   attributes.width = widget->allocation.width - border_width * 2;
 596   attributes.height = widget->allocation.height - border_width * 2;
 597   attributes.window_type = GDK_WINDOW_CHILD;
 598   attributes.wclass = GDK_INPUT_OUTPUT;
 599   attributes.visual = gtk_widget_get_visual (widget);
 600   attributes.colormap = gtk_widget_get_colormap (widget);
 601
 602   event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 603   /* We select on button_press_mask so that button 4-5 scrolls are trapped.
 604    */
 605   attributes.event_mask = event_mask | GDK_BUTTON_PRESS_MASK;
 606
 607   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 608
 609   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 610                                    &attributes, attributes_mask);
 611   gdk_window_set_user_data (widget->window, viewport);
 612
 613   viewport_get_view_allocation (viewport, &view_allocation);
 614
 615   attributes.x = view_allocation.x;
 616   attributes.y = view_allocation.y;
 617   attributes.width = view_allocation.width;
 618   attributes.height = view_allocation.height;
 619   attributes.event_mask = 0;
 620
 621   viewport->view_window = gdk_window_new (widget->window, &attributes, attributes_mask);
 622   gdk_window_set_user_data (viewport->view_window, viewport);
 623
 624   gdk_window_set_back_pixmap (viewport->view_window, NULL, FALSE);
 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   GTK_WIDGET_CLASS (gtk_viewport_parent_class)->unrealize (widget);
 668 }
 669
 670 static void
 671 gtk_viewport_paint (GtkWidget    *widget,
 672                     GdkRectangle *area)
 673 {
 674   if (gtk_widget_is_drawable (widget))
 675     {
 676       GtkViewport *viewport = GTK_VIEWPORT (widget);
 677
 678       gtk_paint_shadow (widget->style, widget->window,
 679                         GTK_STATE_NORMAL, viewport->shadow_type,
 680                         area, widget, "viewport",
 681                         0, 0, -1, -1);
 682     }
 683 }
 684
 685 static gint
 686 gtk_viewport_expose (GtkWidget      *widget,
 687                      GdkEventExpose *event)
 688 {
 689   GtkViewport *viewport;
 690
 691   if (gtk_widget_is_drawable (widget))
 692     {
 693       viewport = GTK_VIEWPORT (widget);
 694
 695       if (event->window == widget->window)
 696         gtk_viewport_paint (widget, &event->area);
 697       else if (event->window == viewport->bin_window)
 698         {
 699           gtk_paint_flat_box(widget->style, viewport->bin_window,
 700                              GTK_STATE_NORMAL, GTK_SHADOW_NONE,
 701                              &event->area, widget, "viewportbin",
 702                              0, 0, -1, -1);
 703
 704           GTK_WIDGET_CLASS (gtk_viewport_parent_class)->expose_event (widget, event);
 705         }
 706     }
 707
 708   return FALSE;
 709 }
 710
 711 static void
 712 gtk_viewport_add (GtkContainer *container,
 713                   GtkWidget    *child)
 714 {
 715   GtkBin *bin = GTK_BIN (container);
 716
 717   g_return_if_fail (bin->child == NULL);
 718
 719   gtk_widget_set_parent_window (child, GTK_VIEWPORT (bin)->bin_window);
 720
 721   GTK_CONTAINER_CLASS (gtk_viewport_parent_class)->add (container, child);
 722 }
 723
 724 static void
 725 gtk_viewport_size_request (GtkWidget      *widget,
 726                            GtkRequisition *requisition)
 727 {
 728   GtkBin *bin = GTK_BIN (widget);
 729   GtkRequisition child_requisition;
 730
 731   requisition->width = GTK_CONTAINER (widget)->border_width;
 732
 733   requisition->height = GTK_CONTAINER (widget)->border_width;
 734
 735   if (GTK_VIEWPORT (widget)->shadow_type != GTK_SHADOW_NONE)
 736     {
 737       requisition->width += 2 * widget->style->xthickness;
 738       requisition->height += 2 * widget->style->ythickness;
 739     }
 740
 741   if (bin->child && gtk_widget_get_visible (bin->child))
 742     {
 743       gtk_widget_size_request (bin->child, &child_requisition);
 744       requisition->width += child_requisition.width;
 745       requisition->height += child_requisition.height;
 746     }
 747 }
 748
 749 static void
 750 gtk_viewport_size_allocate (GtkWidget     *widget,
 751                             GtkAllocation *allocation)
 752 {
 753   GtkViewport *viewport = GTK_VIEWPORT (widget);
 754   GtkBin *bin = GTK_BIN (widget);
 755   gint border_width = GTK_CONTAINER (widget)->border_width;
 756   gboolean hadjustment_value_changed, vadjustment_value_changed;
 757   GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 758   GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 759   GtkAllocation child_allocation;
 760
 761   /* If our size changed, and we have a shadow, queue a redraw on widget->window to
 762    * redraw the shadow correctly.
 763    */
 764   if (gtk_widget_get_mapped (widget) &&
 765       viewport->shadow_type != GTK_SHADOW_NONE &&
 766       (widget->allocation.width != allocation->width ||
 767        widget->allocation.height != allocation->height))
 768     gdk_window_invalidate_rect (widget->window, NULL, FALSE);
 769
 770   widget->allocation = *allocation;
 771
 772   viewport_set_hadjustment_values (viewport, &hadjustment_value_changed);
 773   viewport_set_vadjustment_values (viewport, &vadjustment_value_changed);
 774
 775   child_allocation.x = 0;
 776   child_allocation.y = 0;
 777   child_allocation.width = hadjustment->upper;
 778   child_allocation.height = vadjustment->upper;
 779   if (GTK_WIDGET_REALIZED (widget))
 780     {
 781       GtkAllocation view_allocation;
 782       gdk_window_move_resize (widget->window,
 783                               allocation->x + border_width,
 784                               allocation->y + border_width,
 785                               allocation->width - border_width * 2,
 786                               allocation->height - border_width * 2);
 787
 788       viewport_get_view_allocation (viewport, &view_allocation);
 789       gdk_window_move_resize (viewport->view_window,
 790                               view_allocation.x,
 791                               view_allocation.y,
 792                               view_allocation.width,
 793                               view_allocation.height);
 794       gdk_window_move_resize (viewport->bin_window,
 795                               - hadjustment->value,
 796                               - vadjustment->value,
 797                               child_allocation.width,
 798                               child_allocation.height);
 799     }
 800   if (bin->child && gtk_widget_get_visible (bin->child))
 801     gtk_widget_size_allocate (bin->child, &child_allocation);
 802
 803   gtk_adjustment_changed (hadjustment);
 804   gtk_adjustment_changed (vadjustment);
 805   if (hadjustment_value_changed)
 806     gtk_adjustment_value_changed (hadjustment);
 807   if (vadjustment_value_changed)
 808     gtk_adjustment_value_changed (vadjustment);
 809 }
 810
 811 static void
 812 gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
 813                                        gpointer       data)
 814 {
 815   GtkViewport *viewport = GTK_VIEWPORT (data);
 816   GtkBin *bin = GTK_BIN (data);
 817
 818   if (bin->child && gtk_widget_get_visible (bin->child)  &&
 819       GTK_WIDGET_REALIZED (viewport))
 820     {
 821       GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
 822       GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
 823       gint old_x, old_y;
 824       gint new_x, new_y;
 825
 826       gdk_window_get_position (viewport->bin_window, &old_x, &old_y);
 827       new_x = - hadjustment->value;
 828       new_y = - vadjustment->value;
 829
 830       if (new_x != old_x || new_y != old_y)
 831         {
 832           gdk_window_move (viewport->bin_window, new_x, new_y);
 833           gdk_window_process_updates (viewport->bin_window, TRUE);
 834         }
 835     }
 836 }
 837
 838 static void
 839 gtk_viewport_style_set (GtkWidget *widget,
 840                         GtkStyle  *previous_style)
 841 {
 842    if (GTK_WIDGET_REALIZED (widget) &&
 843        gtk_widget_get_has_window (widget))
 844      {
 845         GtkViewport *viewport = GTK_VIEWPORT (widget);
 846
 847         gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 848         gtk_style_set_background (widget->style, widget->window, widget->state);
 849      }
 850 }
 851
 852 #define __GTK_VIEWPORT_C__
 853 #include "gtkaliasdef.c"