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 "gtksignal.h"
  28 #include "gtkviewport.h"
  29 #include "gtkintl.h"
  30 #include "gtkmarshalers.h"
  31
  32 enum {
  33   PROP_0,
  34   PROP_HADJUSTMENT,
  35   PROP_VADJUSTMENT,
  36   PROP_SHADOW_TYPE
  37 };
  38
  39
  40 static void gtk_viewport_class_init               (GtkViewportClass *klass);
  41 static void gtk_viewport_init                     (GtkViewport      *viewport);
  42 static void gtk_viewport_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_changed       (GtkAdjustment    *adjustment,
  67                                                    gpointer          data);
  68 static void gtk_viewport_adjustment_value_changed (GtkAdjustment    *adjustment,
  69                                                    gpointer          data);
  70 static void gtk_viewport_style_set                (GtkWidget *widget,
  71                                                    GtkStyle  *previous_style);
  72
  73 static GtkBinClass *parent_class;
  74
  75 GtkType
  76 gtk_viewport_get_type (void)
  77 {
  78   static GtkType viewport_type = 0;
  79
  80   if (!viewport_type)
  81     {
  82       static const GtkTypeInfo viewport_info =
  83       {
  84         "GtkViewport",
  85         sizeof (GtkViewport),
  86         sizeof (GtkViewportClass),
  87         (GtkClassInitFunc) gtk_viewport_class_init,
  88         (GtkObjectInitFunc) gtk_viewport_init,
  89         /* reserved_1 */ NULL,
  90         /* reserved_2 */ NULL,
  91         (GtkClassInitFunc) NULL,
  92       };
  93
  94       viewport_type = gtk_type_unique (GTK_TYPE_BIN, &viewport_info);
  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   parent_class = (GtkBinClass*) gtk_type_class (GTK_TYPE_BIN);
 113
 114   gobject_class->set_property = gtk_viewport_set_property;
 115   gobject_class->get_property = gtk_viewport_get_property;
 116   object_class->destroy = gtk_viewport_destroy;
 117
 118   widget_class->realize = gtk_viewport_realize;
 119   widget_class->unrealize = gtk_viewport_unrealize;
 120   widget_class->expose_event = gtk_viewport_expose;
 121   widget_class->size_request = gtk_viewport_size_request;
 122   widget_class->size_allocate = gtk_viewport_size_allocate;
 123   widget_class->style_set = gtk_viewport_style_set;
 124
 125   container_class->add = gtk_viewport_add;
 126
 127   class->set_scroll_adjustments = gtk_viewport_set_scroll_adjustments;
 128
 129   g_object_class_install_property (gobject_class,
 130                                    PROP_HADJUSTMENT,
 131                                    g_param_spec_object ("hadjustment",
 132                                                         _("Horizontal adjustment"),
 133                                                         _("The GtkAdjustment that determines the values of the horizontal position for this viewport."),
 134                                                         GTK_TYPE_ADJUSTMENT,
 135                                                         G_PARAM_READWRITE));
 136
 137   g_object_class_install_property (gobject_class,
 138                                    PROP_VADJUSTMENT,
 139                                    g_param_spec_object ("vadjustment",
 140                                                         _("Vertical adjustment"),
 141                                                         _("The GtkAdjustment that determines the values of the vertical position for this viewport."),
 142                                                         GTK_TYPE_ADJUSTMENT,
 143                                                         G_PARAM_READWRITE));
 144
 145   g_object_class_install_property (gobject_class,
 146                                    PROP_SHADOW_TYPE,
 147                                    g_param_spec_enum ("shadow_type",
 148                                                       _("Shadow type"),
 149                                                       _("Determines how the shadowed box around the viewport is drawn."),
 150                                                       GTK_TYPE_SHADOW_TYPE,
 151                                                       GTK_SHADOW_IN,
 152                                                       G_PARAM_READWRITE));
 153
 154   widget_class->set_scroll_adjustments_signal =
 155     gtk_signal_new ("set_scroll_adjustments",
 156                     GTK_RUN_LAST,
 157                     GTK_CLASS_TYPE (object_class),
 158                     GTK_SIGNAL_OFFSET (GtkViewportClass, set_scroll_adjustments),
 159                     _gtk_marshal_VOID__OBJECT_OBJECT,
 160                     GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
 161 }
 162
 163 static void
 164 gtk_viewport_set_property (GObject         *object,
 165                            guint            prop_id,
 166                            const GValue    *value,
 167                            GParamSpec      *pspec)
 168 {
 169   GtkViewport *viewport;
 170
 171   viewport = GTK_VIEWPORT (object);
 172
 173   switch (prop_id)
 174     {
 175     case PROP_HADJUSTMENT:
 176       gtk_viewport_set_hadjustment (viewport, g_value_get_object (value));
 177       break;
 178     case PROP_VADJUSTMENT:
 179       gtk_viewport_set_vadjustment (viewport, g_value_get_object (value));
 180       break;
 181     case PROP_SHADOW_TYPE:
 182       gtk_viewport_set_shadow_type (viewport, g_value_get_enum (value));
 183       break;
 184     default:
 185       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 186       break;
 187     }
 188 }
 189
 190 static void
 191 gtk_viewport_get_property (GObject         *object,
 192                            guint            prop_id,
 193                            GValue          *value,
 194                            GParamSpec      *pspec)
 195 {
 196   GtkViewport *viewport;
 197
 198   viewport = GTK_VIEWPORT (object);
 199
 200   switch (prop_id)
 201     {
 202     case PROP_HADJUSTMENT:
 203       g_value_set_object (value, G_OBJECT (viewport->hadjustment));
 204       break;
 205     case PROP_VADJUSTMENT:
 206       g_value_set_object (value, G_OBJECT (viewport->vadjustment));
 207       break;
 208     case PROP_SHADOW_TYPE:
 209       g_value_set_enum (value, viewport->shadow_type);
 210       break;
 211     default:
 212       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 213       break;
 214     }
 215 }
 216
 217 static void
 218 gtk_viewport_init (GtkViewport *viewport)
 219 {
 220   GTK_WIDGET_UNSET_FLAGS (viewport, GTK_NO_WINDOW);
 221
 222   gtk_widget_set_redraw_on_allocate (GTK_WIDGET (viewport), FALSE);
 223   gtk_container_set_resize_mode (GTK_CONTAINER (viewport), GTK_RESIZE_QUEUE);
 224
 225   viewport->shadow_type = GTK_SHADOW_IN;
 226   viewport->view_window = NULL;
 227   viewport->bin_window = NULL;
 228   viewport->hadjustment = NULL;
 229   viewport->vadjustment = NULL;
 230 }
 231
 232 /**
 233  * gtk_viewport_new:
 234  * @hadjustment: horizontal adjustment.
 235  * @vadjustment: vertical adjustment.
 236  * @returns: a new #GtkViewport.
 237  *
 238  * Creates a new #GtkViewport with the given adjustments.
 239  *
 240  **/
 241 GtkWidget*
 242 gtk_viewport_new (GtkAdjustment *hadjustment,
 243                   GtkAdjustment *vadjustment)
 244 {
 245   GtkWidget *viewport;
 246
 247   viewport = gtk_widget_new (GTK_TYPE_VIEWPORT,
 248                              "hadjustment", hadjustment,
 249                              "vadjustment", vadjustment,
 250                              NULL);
 251
 252   return viewport;
 253 }
 254
 255 static void
 256 gtk_viewport_destroy (GtkObject *object)
 257 {
 258   GtkViewport *viewport = GTK_VIEWPORT (object);
 259
 260   if (viewport->hadjustment)
 261     {
 262       gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->hadjustment), viewport);
 263       gtk_object_unref (GTK_OBJECT (viewport->hadjustment));
 264       viewport->hadjustment = NULL;
 265     }
 266   if (viewport->vadjustment)
 267     {
 268       gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->vadjustment), viewport);
 269       gtk_object_unref (GTK_OBJECT (viewport->vadjustment));
 270       viewport->vadjustment = NULL;
 271     }
 272
 273   GTK_OBJECT_CLASS (parent_class)->destroy (object);
 274 }
 275
 276 /**
 277  * gtk_viewport_get_hadjustment:
 278  * @viewport: a #GtkViewport.
 279  *
 280  * Returns the horizontal adjustment of the viewport.
 281  *
 282  * Return value: the horizontal adjustment of @viewport.
 283  **/
 284 GtkAdjustment*
 285 gtk_viewport_get_hadjustment (GtkViewport *viewport)
 286 {
 287   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 288
 289   if (!viewport->hadjustment)
 290     gtk_viewport_set_hadjustment (viewport, NULL);
 291
 292   return viewport->hadjustment;
 293 }
 294
 295 /**
 296  * gtk_viewport_get_vadjustment:
 297  * @viewport: a #GtkViewport.
 298  *
 299  * Returns the vertical adjustment of the viewport.
 300  *
 301  * Return value: the vertical adjustment of @viewport.
 302  **/
 303 GtkAdjustment*
 304 gtk_viewport_get_vadjustment (GtkViewport *viewport)
 305 {
 306   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 307
 308   if (!viewport->vadjustment)
 309     gtk_viewport_set_vadjustment (viewport, NULL);
 310
 311   return viewport->vadjustment;
 312 }
 313
 314 /**
 315  * gtk_viewport_set_hadjustment:
 316  * @viewport: a #GtkViewport.
 317  * @adjustment: a #GtkAdjustment.
 318  *
 319  * Sets the horizontal adjustment of the viewport.
 320  **/
 321 void
 322 gtk_viewport_set_hadjustment (GtkViewport   *viewport,
 323                               GtkAdjustment *adjustment)
 324 {
 325   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 326   if (adjustment)
 327     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 328
 329   if (viewport->hadjustment && viewport->hadjustment != adjustment)
 330     {
 331       gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->hadjustment), viewport);
 332       gtk_object_unref (GTK_OBJECT (viewport->hadjustment));
 333       viewport->hadjustment = NULL;
 334     }
 335
 336   if (!adjustment)
 337     adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
 338                                                      0.0, 0.0, 0.0));
 339
 340   if (viewport->hadjustment != adjustment)
 341     {
 342       viewport->hadjustment = adjustment;
 343       gtk_object_ref (GTK_OBJECT (viewport->hadjustment));
 344       gtk_object_sink (GTK_OBJECT (viewport->hadjustment));
 345
 346       gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
 347                           (GtkSignalFunc) gtk_viewport_adjustment_changed,
 348                           (gpointer) viewport);
 349       gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
 350                           (GtkSignalFunc) gtk_viewport_adjustment_value_changed,
 351                           (gpointer) viewport);
 352
 353       gtk_viewport_adjustment_changed (adjustment, viewport);
 354     }
 355
 356   g_object_notify (G_OBJECT (viewport), "hadjustment");
 357 }
 358
 359 /**
 360  * gtk_viewport_set_vadjustment:
 361  * @viewport: a #GtkViewport.
 362  * @adjustment: a #GtkAdjustment.
 363  *
 364  * Sets the vertical adjustment of the viewport.
 365  **/
 366 void
 367 gtk_viewport_set_vadjustment (GtkViewport   *viewport,
 368                               GtkAdjustment *adjustment)
 369 {
 370   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 371   if (adjustment)
 372     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 373
 374   if (viewport->vadjustment && viewport->vadjustment != adjustment)
 375     {
 376       gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->vadjustment), viewport);
 377       gtk_object_unref (GTK_OBJECT (viewport->vadjustment));
 378       viewport->vadjustment = NULL;
 379     }
 380
 381   if (!adjustment)
 382     adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
 383                                                      0.0, 0.0, 0.0));
 384
 385   if (viewport->vadjustment != adjustment)
 386     {
 387       viewport->vadjustment = adjustment;
 388       gtk_object_ref (GTK_OBJECT (viewport->vadjustment));
 389       gtk_object_sink (GTK_OBJECT (viewport->vadjustment));
 390
 391       gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
 392                           (GtkSignalFunc) gtk_viewport_adjustment_changed,
 393                           (gpointer) viewport);
 394       gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
 395                           (GtkSignalFunc) gtk_viewport_adjustment_value_changed,
 396                           (gpointer) viewport);
 397
 398       gtk_viewport_adjustment_changed (adjustment, viewport);
 399     }
 400
 401   g_object_notify (G_OBJECT (viewport), "vadjustment");
 402 }
 403
 404 static void
 405 gtk_viewport_set_scroll_adjustments (GtkViewport      *viewport,
 406                                      GtkAdjustment    *hadjustment,
 407                                      GtkAdjustment    *vadjustment)
 408 {
 409   if (viewport->hadjustment != hadjustment)
 410     gtk_viewport_set_hadjustment (viewport, hadjustment);
 411   if (viewport->vadjustment != vadjustment)
 412     gtk_viewport_set_vadjustment (viewport, vadjustment);
 413 }
 414
 415 /**
 416  * gtk_viewport_set_shadow_type:
 417  * @viewport: a #GtkViewport.
 418  * @type: the new shadow type.
 419  *
 420  * Sets the shadow type of the viewport.
 421  **/
 422 void
 423 gtk_viewport_set_shadow_type (GtkViewport   *viewport,
 424                               GtkShadowType  type)
 425 {
 426   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 427
 428   if ((GtkShadowType) viewport->shadow_type != type)
 429     {
 430       viewport->shadow_type = type;
 431
 432       if (GTK_WIDGET_VISIBLE (viewport))
 433         {
 434           gtk_widget_size_allocate (GTK_WIDGET (viewport), &(GTK_WIDGET (viewport)->allocation));
 435           gtk_widget_queue_draw (GTK_WIDGET (viewport));
 436         }
 437     }
 438
 439   g_object_notify (G_OBJECT (viewport), "shadow_type");
 440 }
 441
 442 /**
 443  * gtk_viewport_get_shadow_type:
 444  * @viewport: a #GtkViewport
 445  *
 446  * Gets the shadow type of the #GtkViewport. See
 447  * gtk_viewport_set_shadow_type().
 448
 449  * Return value: the shadow type
 450  **/
 451 GtkShadowType
 452 gtk_viewport_get_shadow_type (GtkViewport *viewport)
 453 {
 454   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), GTK_SHADOW_NONE);
 455
 456   return viewport->shadow_type;
 457 }
 458
 459 static void
 460 gtk_viewport_realize (GtkWidget *widget)
 461 {
 462   GtkBin *bin;
 463   GtkViewport *viewport;
 464   GdkWindowAttr attributes;
 465   gint attributes_mask;
 466   gint event_mask;
 467   gint border_width;
 468
 469   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 470
 471   border_width = GTK_CONTAINER (widget)->border_width;
 472
 473   bin = GTK_BIN (widget);
 474   viewport = GTK_VIEWPORT (widget);
 475   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 476
 477   attributes.x = widget->allocation.x + border_width;
 478   attributes.y = widget->allocation.y + border_width;
 479   attributes.width = widget->allocation.width - border_width * 2;
 480   attributes.height = widget->allocation.height - border_width * 2;
 481   attributes.window_type = GDK_WINDOW_CHILD;
 482   attributes.wclass = GDK_INPUT_OUTPUT;
 483   attributes.visual = gtk_widget_get_visual (widget);
 484   attributes.colormap = gtk_widget_get_colormap (widget);
 485
 486   event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 487   /* We select on button_press_mask so that button 4-5 scrolls are trapped.
 488    */
 489   attributes.event_mask = event_mask | GDK_BUTTON_PRESS_MASK;
 490
 491   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 492
 493   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 494                                    &attributes, attributes_mask);
 495   gdk_window_set_user_data (widget->window, viewport);
 496
 497   if (viewport->shadow_type != GTK_SHADOW_NONE)
 498     {
 499       attributes.x = widget->style->xthickness;
 500       attributes.y = widget->style->ythickness;
 501     }
 502   else
 503     {
 504       attributes.x = 0;
 505       attributes.y = 0;
 506     }
 507
 508   attributes.width = MAX (1, (gint)widget->allocation.width - attributes.x * 2 - border_width * 2);
 509   attributes.height = MAX (1, (gint)widget->allocation.height - attributes.y * 2 - border_width * 2);
 510   attributes.event_mask = 0;
 511
 512   viewport->view_window = gdk_window_new (widget->window, &attributes, attributes_mask);
 513   gdk_window_set_user_data (viewport->view_window, viewport);
 514
 515   attributes.x = 0;
 516   attributes.y = 0;
 517
 518   if (bin->child)
 519     {
 520       attributes.width = viewport->hadjustment->upper;
 521       attributes.height = viewport->vadjustment->upper;
 522     }
 523
 524   attributes.event_mask = event_mask;
 525
 526   viewport->bin_window = gdk_window_new (viewport->view_window, &attributes, attributes_mask);
 527   gdk_window_set_user_data (viewport->bin_window, viewport);
 528
 529   if (bin->child)
 530     gtk_widget_set_parent_window (bin->child, viewport->bin_window);
 531
 532   widget->style = gtk_style_attach (widget->style, widget->window);
 533   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 534   gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 535
 536    gtk_paint_flat_box(widget->style, viewport->bin_window, GTK_STATE_NORMAL,
 537                       GTK_SHADOW_NONE,
 538                       NULL, widget, "viewportbin",
 539                       0, 0, -1, -1);
 540
 541   gdk_window_show (viewport->bin_window);
 542   gdk_window_show (viewport->view_window);
 543 }
 544
 545 static void
 546 gtk_viewport_unrealize (GtkWidget *widget)
 547 {
 548   GtkViewport *viewport;
 549
 550   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 551
 552   viewport = GTK_VIEWPORT (widget);
 553
 554   gdk_window_set_user_data (viewport->view_window, NULL);
 555   gdk_window_destroy (viewport->view_window);
 556   viewport->view_window = NULL;
 557
 558   gdk_window_set_user_data (viewport->bin_window, NULL);
 559   gdk_window_destroy (viewport->bin_window);
 560   viewport->bin_window = NULL;
 561
 562   if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 563     (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 564 }
 565
 566 static void
 567 gtk_viewport_paint (GtkWidget    *widget,
 568                     GdkRectangle *area)
 569 {
 570   GtkViewport *viewport;
 571
 572   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 573   g_return_if_fail (area != NULL);
 574
 575   if (GTK_WIDGET_DRAWABLE (widget))
 576     {
 577       viewport = GTK_VIEWPORT (widget);
 578
 579       gtk_draw_shadow (widget->style, widget->window,
 580                        GTK_STATE_NORMAL, viewport->shadow_type,
 581                        0, 0, -1, -1);
 582     }
 583 }
 584
 585 static gint
 586 gtk_viewport_expose (GtkWidget      *widget,
 587                      GdkEventExpose *event)
 588 {
 589   GtkViewport *viewport;
 590   GtkBin *bin;
 591   GdkEventExpose child_event;
 592
 593   g_return_val_if_fail (GTK_IS_VIEWPORT (widget), FALSE);
 594   g_return_val_if_fail (event != NULL, FALSE);
 595
 596   if (GTK_WIDGET_DRAWABLE (widget))
 597     {
 598       viewport = GTK_VIEWPORT (widget);
 599       bin = GTK_BIN (widget);
 600
 601       if (event->window == widget->window)
 602         gtk_viewport_paint (widget, &event->area);
 603       else if (event->window == viewport->bin_window)
 604         {
 605           child_event = *event;
 606
 607           gtk_paint_flat_box(widget->style, viewport->bin_window,
 608                              GTK_STATE_NORMAL, GTK_SHADOW_NONE,
 609                              &event->area, widget, "viewportbin",
 610                              0, 0, -1, -1);
 611
 612           (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
 613         }
 614
 615
 616     }
 617
 618   return FALSE;
 619 }
 620
 621 static void
 622 gtk_viewport_add (GtkContainer *container,
 623                   GtkWidget    *child)
 624 {
 625   GtkBin *bin;
 626
 627   g_return_if_fail (GTK_IS_VIEWPORT (container));
 628   g_return_if_fail (child != NULL);
 629
 630   bin = GTK_BIN (container);
 631   g_return_if_fail (bin->child == NULL);
 632
 633   gtk_widget_set_parent_window (child, GTK_VIEWPORT (bin)->bin_window);
 634
 635   GTK_CONTAINER_CLASS (parent_class)->add (container, child);
 636 }
 637
 638 static void
 639 gtk_viewport_size_request (GtkWidget      *widget,
 640                            GtkRequisition *requisition)
 641 {
 642   GtkViewport *viewport;
 643   GtkBin *bin;
 644   GtkRequisition child_requisition;
 645
 646   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 647   g_return_if_fail (requisition != NULL);
 648
 649   viewport = GTK_VIEWPORT (widget);
 650   bin = GTK_BIN (widget);
 651
 652   requisition->width = (GTK_CONTAINER (widget)->border_width +
 653                         GTK_WIDGET (widget)->style->xthickness) * 2;
 654
 655   requisition->height = (GTK_CONTAINER (widget)->border_width * 2 +
 656                          GTK_WIDGET (widget)->style->ythickness) * 2;
 657
 658   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 659     {
 660       gtk_widget_size_request (bin->child, &child_requisition);
 661       requisition->width += child_requisition.width;
 662       requisition->height += child_requisition.height;
 663     }
 664 }
 665
 666 static void
 667 gtk_viewport_size_allocate (GtkWidget     *widget,
 668                             GtkAllocation *allocation)
 669 {
 670   GtkViewport *viewport = GTK_VIEWPORT (widget);
 671   GtkBin *bin = GTK_BIN (widget);
 672   GtkAllocation child_allocation;
 673   gint hval, vval;
 674   gint border_width = GTK_CONTAINER (widget)->border_width;
 675
 676   /* demand creation */
 677   if (!viewport->hadjustment)
 678     gtk_viewport_set_hadjustment (viewport, NULL);
 679   if (!viewport->vadjustment)
 680     gtk_viewport_set_hadjustment (viewport, NULL);
 681
 682   /* If our size changed, and we have a shadow, queue a redraw on widget->window to
 683    * redraw the shadow correctly.
 684    */
 685   if (GTK_WIDGET_MAPPED (widget) &&
 686       viewport->shadow_type != GTK_SHADOW_NONE &&
 687       (widget->allocation.width != allocation->width ||
 688        widget->allocation.height != allocation->height))
 689     gdk_window_invalidate_rect (widget->window, NULL, FALSE);
 690
 691   widget->allocation = *allocation;
 692
 693   child_allocation.x = 0;
 694   child_allocation.y = 0;
 695
 696   if (viewport->shadow_type != GTK_SHADOW_NONE)
 697     {
 698       child_allocation.x = widget->style->xthickness;
 699       child_allocation.y = widget->style->ythickness;
 700     }
 701
 702   child_allocation.width = MAX (1, allocation->width - child_allocation.x * 2 - border_width * 2);
 703   child_allocation.height = MAX (1, allocation->height - child_allocation.y * 2 - border_width * 2);
 704
 705   if (GTK_WIDGET_REALIZED (widget))
 706     {
 707       gdk_window_move_resize (widget->window,
 708                               allocation->x + border_width,
 709                               allocation->y + border_width,
 710                               allocation->width - border_width * 2,
 711                               allocation->height - border_width * 2);
 712
 713       gdk_window_move_resize (viewport->view_window,
 714                               child_allocation.x,
 715                               child_allocation.y,
 716                               child_allocation.width,
 717                               child_allocation.height);
 718     }
 719
 720   viewport->hadjustment->page_size = child_allocation.width;
 721   viewport->hadjustment->page_increment = viewport->hadjustment->page_size / 2;
 722   viewport->hadjustment->step_increment = 10;
 723
 724   viewport->vadjustment->page_size = child_allocation.height;
 725   viewport->vadjustment->page_increment = viewport->vadjustment->page_size / 2;
 726   viewport->vadjustment->step_increment = 10;
 727
 728   hval = viewport->hadjustment->value;
 729   vval = viewport->vadjustment->value;
 730
 731   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 732     {
 733       GtkRequisition child_requisition;
 734       gtk_widget_get_child_requisition (bin->child, &child_requisition);
 735
 736       viewport->hadjustment->lower = 0;
 737       viewport->hadjustment->upper = MAX (child_requisition.width,
 738                                           child_allocation.width);
 739
 740       hval = CLAMP (hval, 0,
 741                     viewport->hadjustment->upper -
 742                     viewport->hadjustment->page_size);
 743
 744       viewport->vadjustment->lower = 0;
 745       viewport->vadjustment->upper = MAX (child_requisition.height,
 746                                           child_allocation.height);
 747
 748       vval = CLAMP (vval, 0,
 749                     viewport->vadjustment->upper -
 750                     viewport->vadjustment->page_size);
 751     }
 752
 753   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 754     {
 755       child_allocation.x = 0;
 756       child_allocation.y = 0;
 757
 758       child_allocation.width = viewport->hadjustment->upper;
 759       child_allocation.height = viewport->vadjustment->upper;
 760
 761       if (GTK_WIDGET_REALIZED (widget))
 762         gdk_window_resize (viewport->bin_window,
 763                            child_allocation.width,
 764                            child_allocation.height);
 765
 766       child_allocation.x = 0;
 767       child_allocation.y = 0;
 768       gtk_widget_size_allocate (bin->child, &child_allocation);
 769     }
 770
 771   gtk_signal_emit_by_name (GTK_OBJECT (viewport->hadjustment), "changed");
 772   gtk_signal_emit_by_name (GTK_OBJECT (viewport->vadjustment), "changed");
 773   if (viewport->hadjustment->value != hval)
 774     {
 775       viewport->hadjustment->value = hval;
 776       gtk_signal_emit_by_name (GTK_OBJECT (viewport->hadjustment), "value_changed");
 777     }
 778   if (viewport->vadjustment->value != vval)
 779     {
 780       viewport->vadjustment->value = vval;
 781       gtk_signal_emit_by_name (GTK_OBJECT (viewport->vadjustment), "value_changed");
 782     }
 783 }
 784
 785 static void
 786 gtk_viewport_adjustment_changed (GtkAdjustment *adjustment,
 787                                  gpointer       data)
 788 {
 789   GtkViewport *viewport;
 790
 791   g_return_if_fail (adjustment != NULL);
 792   g_return_if_fail (GTK_IS_VIEWPORT (data));
 793
 794   viewport = GTK_VIEWPORT (data);
 795 }
 796
 797 static void
 798 gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
 799                                        gpointer       data)
 800 {
 801   GtkViewport *viewport;
 802   GtkBin *bin;
 803   GtkAllocation child_allocation;
 804
 805   g_return_if_fail (adjustment != NULL);
 806   g_return_if_fail (GTK_IS_VIEWPORT (data));
 807
 808   viewport = GTK_VIEWPORT (data);
 809   bin = GTK_BIN (data);
 810
 811   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 812     {
 813       child_allocation.x = 0;
 814       child_allocation.y = 0;
 815
 816       if (viewport->hadjustment->lower != (viewport->hadjustment->upper -
 817                                            viewport->hadjustment->page_size))
 818         child_allocation.x =  viewport->hadjustment->lower - viewport->hadjustment->value;
 819
 820       if (viewport->vadjustment->lower != (viewport->vadjustment->upper -
 821                                            viewport->vadjustment->page_size))
 822         child_allocation.y = viewport->vadjustment->lower - viewport->vadjustment->value;
 823
 824       if (GTK_WIDGET_REALIZED (viewport))
 825         {
 826           gdk_window_move (viewport->bin_window,
 827                            child_allocation.x,
 828                            child_allocation.y);
 829
 830           gdk_window_process_updates (viewport->bin_window, TRUE);
 831         }
 832     }
 833 }
 834
 835 static void
 836 gtk_viewport_style_set (GtkWidget *widget,
 837                         GtkStyle  *previous_style)
 838 {
 839    GtkViewport *viewport;
 840
 841    if (GTK_WIDGET_REALIZED (widget) &&
 842        !GTK_WIDGET_NO_WINDOW (widget))
 843      {
 844         viewport = GTK_VIEWPORT (widget);
 845
 846         gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 847         gtk_style_set_background (widget->style, widget->window, widget->state);
 848      }
 849 }