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_destroy                  (GtkObject        *object);
  42 static void gtk_viewport_set_property             (GObject         *object,
  43                                                    guint            prop_id,
  44                                                    const GValue    *value,
  45                                                    GParamSpec      *pspec);
  46 static void gtk_viewport_get_property             (GObject         *object,
  47                                                    guint            prop_id,
  48                                                    GValue          *value,
  49                                                    GParamSpec      *pspec);
  50 static void gtk_viewport_set_scroll_adjustments   (GtkViewport      *viewport,
  51                                                    GtkAdjustment    *hadjustment,
  52                                                    GtkAdjustment    *vadjustment);
  53 static void gtk_viewport_realize                  (GtkWidget        *widget);
  54 static void gtk_viewport_unrealize                (GtkWidget        *widget);
  55 static void gtk_viewport_paint                    (GtkWidget        *widget,
  56                                                    GdkRectangle     *area);
  57 static gint gtk_viewport_expose                   (GtkWidget        *widget,
  58                                                    GdkEventExpose   *event);
  59 static void gtk_viewport_add                      (GtkContainer     *container,
  60                                                    GtkWidget        *widget);
  61 static void gtk_viewport_size_request             (GtkWidget        *widget,
  62                                                    GtkRequisition   *requisition);
  63 static void gtk_viewport_size_allocate            (GtkWidget        *widget,
  64                                                    GtkAllocation    *allocation);
  65 static void gtk_viewport_adjustment_changed       (GtkAdjustment    *adjustment,
  66                                                    gpointer          data);
  67 static void gtk_viewport_adjustment_value_changed (GtkAdjustment    *adjustment,
  68                                                    gpointer          data);
  69 static void gtk_viewport_style_set                (GtkWidget *widget,
  70                                                    GtkStyle  *previous_style);
  71
  72 static GtkBinClass *parent_class;
  73
  74 GType
  75 gtk_viewport_get_type (void)
  76 {
  77   static GType viewport_type = 0;
  78
  79   if (!viewport_type)
  80     {
  81       static const GTypeInfo viewport_info =
  82       {
  83         sizeof (GtkViewportClass),
  84         NULL,           /* base_init */
  85         NULL,           /* base_finalize */
  86         (GClassInitFunc) gtk_viewport_class_init,
  87         NULL,           /* class_finalize */
  88         NULL,           /* class_data */
  89         sizeof (GtkViewport),
  90         0,              /* n_preallocs */
  91         (GInstanceInitFunc) gtk_viewport_init,
  92       };
  93
  94       viewport_type = g_type_register_static (GTK_TYPE_BIN, "GtkViewport",
  95                                               &viewport_info, 0);
  96     }
  97
  98   return viewport_type;
  99 }
 100
 101 static void
 102 gtk_viewport_class_init (GtkViewportClass *class)
 103 {
 104   GtkObjectClass *object_class;
 105   GObjectClass   *gobject_class;
 106   GtkWidgetClass *widget_class;
 107   GtkContainerClass *container_class;
 108
 109   object_class = (GtkObjectClass*) class;
 110   gobject_class = G_OBJECT_CLASS (class);
 111   widget_class = (GtkWidgetClass*) class;
 112   container_class = (GtkContainerClass*) class;
 113
 114   parent_class = g_type_class_peek_parent (class);
 115
 116   gobject_class->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                                                         _("Horizontal adjustment"),
 135                                                         _("The GtkAdjustment that determines the values of the horizontal position for this viewport"),
 136                                                         GTK_TYPE_ADJUSTMENT,
 137                                                         G_PARAM_READWRITE));
 138
 139   g_object_class_install_property (gobject_class,
 140                                    PROP_VADJUSTMENT,
 141                                    g_param_spec_object ("vadjustment",
 142                                                         _("Vertical adjustment"),
 143                                                         _("The GtkAdjustment that determines the values of the vertical position for this viewport"),
 144                                                         GTK_TYPE_ADJUSTMENT,
 145                                                         G_PARAM_READWRITE));
 146
 147   g_object_class_install_property (gobject_class,
 148                                    PROP_SHADOW_TYPE,
 149                                    g_param_spec_enum ("shadow_type",
 150                                                       _("Shadow type"),
 151                                                       _("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 static void
 261 gtk_viewport_destroy (GtkObject *object)
 262 {
 263   GtkViewport *viewport = GTK_VIEWPORT (object);
 264
 265   if (viewport->hadjustment)
 266     {
 267       g_signal_handlers_disconnect_by_func (viewport->hadjustment,
 268                                             gtk_viewport_adjustment_changed,
 269                                             viewport);
 270       g_signal_handlers_disconnect_by_func (viewport->hadjustment,
 271                                             gtk_viewport_adjustment_value_changed,
 272                                             viewport);
 273       g_object_unref (viewport->hadjustment);
 274       viewport->hadjustment = NULL;
 275     }
 276   if (viewport->vadjustment)
 277     {
 278       g_signal_handlers_disconnect_by_func (viewport->vadjustment,
 279                                             gtk_viewport_adjustment_changed,
 280                                             viewport);
 281       g_signal_handlers_disconnect_by_func (viewport->vadjustment,
 282                                             gtk_viewport_adjustment_value_changed,
 283                                             viewport);
 284       g_object_unref (viewport->vadjustment);
 285       viewport->vadjustment = NULL;
 286     }
 287
 288   GTK_OBJECT_CLASS (parent_class)->destroy (object);
 289 }
 290
 291 /**
 292  * gtk_viewport_get_hadjustment:
 293  * @viewport: a #GtkViewport.
 294  *
 295  * Returns the horizontal adjustment of the viewport.
 296  *
 297  * Return value: the horizontal adjustment of @viewport.
 298  **/
 299 GtkAdjustment*
 300 gtk_viewport_get_hadjustment (GtkViewport *viewport)
 301 {
 302   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 303
 304   if (!viewport->hadjustment)
 305     gtk_viewport_set_hadjustment (viewport, NULL);
 306
 307   return viewport->hadjustment;
 308 }
 309
 310 /**
 311  * gtk_viewport_get_vadjustment:
 312  * @viewport: a #GtkViewport.
 313  *
 314  * Returns the vertical adjustment of the viewport.
 315  *
 316  * Return value: the vertical adjustment of @viewport.
 317  **/
 318 GtkAdjustment*
 319 gtk_viewport_get_vadjustment (GtkViewport *viewport)
 320 {
 321   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 322
 323   if (!viewport->vadjustment)
 324     gtk_viewport_set_vadjustment (viewport, NULL);
 325
 326   return viewport->vadjustment;
 327 }
 328
 329 /**
 330  * gtk_viewport_set_hadjustment:
 331  * @viewport: a #GtkViewport.
 332  * @adjustment: a #GtkAdjustment.
 333  *
 334  * Sets the horizontal adjustment of the viewport.
 335  **/
 336 void
 337 gtk_viewport_set_hadjustment (GtkViewport   *viewport,
 338                               GtkAdjustment *adjustment)
 339 {
 340   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 341   if (adjustment)
 342     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 343
 344   if (viewport->hadjustment && viewport->hadjustment != adjustment)
 345     {
 346       g_signal_handlers_disconnect_by_func (viewport->hadjustment,
 347                                             gtk_viewport_adjustment_changed,
 348                                             viewport);
 349       g_signal_handlers_disconnect_by_func (viewport->hadjustment,
 350                                             gtk_viewport_adjustment_value_changed,
 351                                             viewport);
 352       g_object_unref (viewport->hadjustment);
 353       viewport->hadjustment = NULL;
 354     }
 355
 356   if (!adjustment)
 357     adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
 358                                                      0.0, 0.0, 0.0));
 359
 360   if (viewport->hadjustment != adjustment)
 361     {
 362       viewport->hadjustment = adjustment;
 363       g_object_ref (viewport->hadjustment);
 364       gtk_object_sink (GTK_OBJECT (viewport->hadjustment));
 365
 366       g_signal_connect (adjustment, "changed",
 367                         G_CALLBACK (gtk_viewport_adjustment_changed),
 368                         viewport);
 369       g_signal_connect (adjustment, "value_changed",
 370                         G_CALLBACK (gtk_viewport_adjustment_value_changed),
 371                         viewport);
 372
 373       gtk_viewport_adjustment_changed (adjustment, viewport);
 374     }
 375
 376   g_object_notify (G_OBJECT (viewport), "hadjustment");
 377 }
 378
 379 /**
 380  * gtk_viewport_set_vadjustment:
 381  * @viewport: a #GtkViewport.
 382  * @adjustment: a #GtkAdjustment.
 383  *
 384  * Sets the vertical adjustment of the viewport.
 385  **/
 386 void
 387 gtk_viewport_set_vadjustment (GtkViewport   *viewport,
 388                               GtkAdjustment *adjustment)
 389 {
 390   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 391   if (adjustment)
 392     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 393
 394   if (viewport->vadjustment && viewport->vadjustment != adjustment)
 395     {
 396       g_signal_handlers_disconnect_by_func (viewport->vadjustment,
 397                                             gtk_viewport_adjustment_changed,
 398                                             viewport);
 399       g_signal_handlers_disconnect_by_func (viewport->vadjustment,
 400                                             gtk_viewport_adjustment_value_changed,
 401                                             viewport);
 402       g_object_unref (viewport->vadjustment);
 403       viewport->vadjustment = NULL;
 404     }
 405
 406   if (!adjustment)
 407     adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
 408                                                      0.0, 0.0, 0.0));
 409
 410   if (viewport->vadjustment != adjustment)
 411     {
 412       viewport->vadjustment = adjustment;
 413       g_object_ref (viewport->vadjustment);
 414       gtk_object_sink (GTK_OBJECT (viewport->vadjustment));
 415
 416       g_signal_connect (adjustment, "changed",
 417                         G_CALLBACK (gtk_viewport_adjustment_changed),
 418                         viewport);
 419       g_signal_connect (adjustment, "value_changed",
 420                         G_CALLBACK (gtk_viewport_adjustment_value_changed),
 421                         viewport);
 422
 423       gtk_viewport_adjustment_changed (adjustment, viewport);
 424     }
 425
 426     g_object_notify (G_OBJECT (viewport), "vadjustment");
 427 }
 428
 429 static void
 430 gtk_viewport_set_scroll_adjustments (GtkViewport      *viewport,
 431                                      GtkAdjustment    *hadjustment,
 432                                      GtkAdjustment    *vadjustment)
 433 {
 434   if (viewport->hadjustment != hadjustment)
 435     gtk_viewport_set_hadjustment (viewport, hadjustment);
 436   if (viewport->vadjustment != vadjustment)
 437     gtk_viewport_set_vadjustment (viewport, vadjustment);
 438 }
 439
 440 /**
 441  * gtk_viewport_set_shadow_type:
 442  * @viewport: a #GtkViewport.
 443  * @type: the new shadow type.
 444  *
 445  * Sets the shadow type of the viewport.
 446  **/
 447 void
 448 gtk_viewport_set_shadow_type (GtkViewport   *viewport,
 449                               GtkShadowType  type)
 450 {
 451   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 452
 453   if ((GtkShadowType) viewport->shadow_type != type)
 454     {
 455       viewport->shadow_type = type;
 456
 457       if (GTK_WIDGET_VISIBLE (viewport))
 458         {
 459           gtk_widget_size_allocate (GTK_WIDGET (viewport), &(GTK_WIDGET (viewport)->allocation));
 460           gtk_widget_queue_draw (GTK_WIDGET (viewport));
 461         }
 462
 463       g_object_notify (G_OBJECT (viewport), "shadow_type");
 464     }
 465 }
 466
 467 /**
 468  * gtk_viewport_get_shadow_type:
 469  * @viewport: a #GtkViewport
 470  *
 471  * Gets the shadow type of the #GtkViewport. See
 472  * gtk_viewport_set_shadow_type().
 473
 474  * Return value: the shadow type
 475  **/
 476 GtkShadowType
 477 gtk_viewport_get_shadow_type (GtkViewport *viewport)
 478 {
 479   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), GTK_SHADOW_NONE);
 480
 481   return viewport->shadow_type;
 482 }
 483
 484 static void
 485 gtk_viewport_realize (GtkWidget *widget)
 486 {
 487   GtkBin *bin;
 488   GtkViewport *viewport;
 489   GdkWindowAttr attributes;
 490   gint attributes_mask;
 491   gint event_mask;
 492   gint border_width;
 493
 494   border_width = GTK_CONTAINER (widget)->border_width;
 495
 496   bin = GTK_BIN (widget);
 497   viewport = GTK_VIEWPORT (widget);
 498   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 499
 500   attributes.x = widget->allocation.x + border_width;
 501   attributes.y = widget->allocation.y + border_width;
 502   attributes.width = widget->allocation.width - border_width * 2;
 503   attributes.height = widget->allocation.height - border_width * 2;
 504   attributes.window_type = GDK_WINDOW_CHILD;
 505   attributes.wclass = GDK_INPUT_OUTPUT;
 506   attributes.visual = gtk_widget_get_visual (widget);
 507   attributes.colormap = gtk_widget_get_colormap (widget);
 508
 509   event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 510   /* We select on button_press_mask so that button 4-5 scrolls are trapped.
 511    */
 512   attributes.event_mask = event_mask | GDK_BUTTON_PRESS_MASK;
 513
 514   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 515
 516   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 517                                    &attributes, attributes_mask);
 518   gdk_window_set_user_data (widget->window, viewport);
 519
 520   if (viewport->shadow_type != GTK_SHADOW_NONE)
 521     {
 522       attributes.x = widget->style->xthickness;
 523       attributes.y = widget->style->ythickness;
 524     }
 525   else
 526     {
 527       attributes.x = 0;
 528       attributes.y = 0;
 529     }
 530
 531   attributes.width = MAX (1, (gint)widget->allocation.width - attributes.x * 2 - border_width * 2);
 532   attributes.height = MAX (1, (gint)widget->allocation.height - attributes.y * 2 - border_width * 2);
 533   attributes.event_mask = 0;
 534
 535   viewport->view_window = gdk_window_new (widget->window, &attributes, attributes_mask);
 536   gdk_window_set_user_data (viewport->view_window, viewport);
 537
 538   attributes.x = 0;
 539   attributes.y = 0;
 540
 541   if (bin->child)
 542     {
 543       attributes.width = viewport->hadjustment->upper;
 544       attributes.height = viewport->vadjustment->upper;
 545     }
 546
 547   attributes.event_mask = event_mask;
 548
 549   viewport->bin_window = gdk_window_new (viewport->view_window, &attributes, attributes_mask);
 550   gdk_window_set_user_data (viewport->bin_window, viewport);
 551
 552   if (bin->child)
 553     gtk_widget_set_parent_window (bin->child, viewport->bin_window);
 554
 555   widget->style = gtk_style_attach (widget->style, widget->window);
 556   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 557   gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 558
 559    gtk_paint_flat_box(widget->style, viewport->bin_window, GTK_STATE_NORMAL,
 560                       GTK_SHADOW_NONE,
 561                       NULL, widget, "viewportbin",
 562                       0, 0, -1, -1);
 563
 564   gdk_window_show (viewport->bin_window);
 565   gdk_window_show (viewport->view_window);
 566 }
 567
 568 static void
 569 gtk_viewport_unrealize (GtkWidget *widget)
 570 {
 571   GtkViewport *viewport = GTK_VIEWPORT (widget);
 572
 573   gdk_window_set_user_data (viewport->view_window, NULL);
 574   gdk_window_destroy (viewport->view_window);
 575   viewport->view_window = NULL;
 576
 577   gdk_window_set_user_data (viewport->bin_window, NULL);
 578   gdk_window_destroy (viewport->bin_window);
 579   viewport->bin_window = NULL;
 580
 581   if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 582     (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 583 }
 584
 585 static void
 586 gtk_viewport_paint (GtkWidget    *widget,
 587                     GdkRectangle *area)
 588 {
 589   GtkViewport *viewport;
 590
 591   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 592   g_return_if_fail (area != NULL);
 593
 594   if (GTK_WIDGET_DRAWABLE (widget))
 595     {
 596       viewport = GTK_VIEWPORT (widget);
 597
 598       gtk_paint_shadow (widget->style, widget->window,
 599                         GTK_STATE_NORMAL, viewport->shadow_type,
 600                         NULL, widget, "viewport",
 601                         0, 0, -1, -1);
 602     }
 603 }
 604
 605 static gint
 606 gtk_viewport_expose (GtkWidget      *widget,
 607                      GdkEventExpose *event)
 608 {
 609   GtkViewport *viewport;
 610   GtkBin *bin;
 611
 612   if (GTK_WIDGET_DRAWABLE (widget))
 613     {
 614       viewport = GTK_VIEWPORT (widget);
 615       bin = GTK_BIN (widget);
 616
 617       if (event->window == widget->window)
 618         gtk_viewport_paint (widget, &event->area);
 619       else if (event->window == viewport->bin_window)
 620         {
 621           gtk_paint_flat_box(widget->style, viewport->bin_window,
 622                              GTK_STATE_NORMAL, GTK_SHADOW_NONE,
 623                              &event->area, widget, "viewportbin",
 624                              0, 0, -1, -1);
 625
 626           (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
 627         }
 628
 629
 630     }
 631
 632   return FALSE;
 633 }
 634
 635 static void
 636 gtk_viewport_add (GtkContainer *container,
 637                   GtkWidget    *child)
 638 {
 639   GtkBin *bin;
 640
 641   g_return_if_fail (GTK_IS_WIDGET (child));
 642
 643   bin = GTK_BIN (container);
 644   g_return_if_fail (bin->child == NULL);
 645
 646   gtk_widget_set_parent_window (child, GTK_VIEWPORT (bin)->bin_window);
 647
 648   GTK_CONTAINER_CLASS (parent_class)->add (container, child);
 649 }
 650
 651 static void
 652 gtk_viewport_size_request (GtkWidget      *widget,
 653                            GtkRequisition *requisition)
 654 {
 655   GtkViewport *viewport;
 656   GtkBin *bin;
 657   GtkRequisition child_requisition;
 658
 659   viewport = GTK_VIEWPORT (widget);
 660   bin = GTK_BIN (widget);
 661
 662   requisition->width = (GTK_CONTAINER (widget)->border_width +
 663                         GTK_WIDGET (widget)->style->xthickness) * 2;
 664
 665   requisition->height = (GTK_CONTAINER (widget)->border_width * 2 +
 666                          GTK_WIDGET (widget)->style->ythickness) * 2;
 667
 668   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 669     {
 670       gtk_widget_size_request (bin->child, &child_requisition);
 671       requisition->width += child_requisition.width;
 672       requisition->height += child_requisition.height;
 673     }
 674 }
 675
 676 static void
 677 gtk_viewport_size_allocate (GtkWidget     *widget,
 678                             GtkAllocation *allocation)
 679 {
 680   GtkViewport *viewport = GTK_VIEWPORT (widget);
 681   GtkBin *bin = GTK_BIN (widget);
 682   GtkAllocation child_allocation;
 683   gint hval, vval;
 684   gint border_width = GTK_CONTAINER (widget)->border_width;
 685
 686   /* demand creation */
 687   if (!viewport->hadjustment)
 688     gtk_viewport_set_hadjustment (viewport, NULL);
 689   if (!viewport->vadjustment)
 690     gtk_viewport_set_vadjustment (viewport, NULL);
 691
 692   /* If our size changed, and we have a shadow, queue a redraw on widget->window to
 693    * redraw the shadow correctly.
 694    */
 695   if (GTK_WIDGET_MAPPED (widget) &&
 696       viewport->shadow_type != GTK_SHADOW_NONE &&
 697       (widget->allocation.width != allocation->width ||
 698        widget->allocation.height != allocation->height))
 699     gdk_window_invalidate_rect (widget->window, NULL, FALSE);
 700
 701   widget->allocation = *allocation;
 702
 703   child_allocation.x = 0;
 704   child_allocation.y = 0;
 705
 706   if (viewport->shadow_type != GTK_SHADOW_NONE)
 707     {
 708       child_allocation.x = widget->style->xthickness;
 709       child_allocation.y = widget->style->ythickness;
 710     }
 711
 712   child_allocation.width = MAX (1, allocation->width - child_allocation.x * 2 - border_width * 2);
 713   child_allocation.height = MAX (1, allocation->height - child_allocation.y * 2 - border_width * 2);
 714
 715   if (GTK_WIDGET_REALIZED (widget))
 716     {
 717       gdk_window_move_resize (widget->window,
 718                               allocation->x + border_width,
 719                               allocation->y + border_width,
 720                               allocation->width - border_width * 2,
 721                               allocation->height - border_width * 2);
 722
 723       gdk_window_move_resize (viewport->view_window,
 724                               child_allocation.x,
 725                               child_allocation.y,
 726                               child_allocation.width,
 727                               child_allocation.height);
 728     }
 729
 730   viewport->hadjustment->page_size = child_allocation.width;
 731   viewport->hadjustment->step_increment = child_allocation.width * 0.1;
 732   viewport->hadjustment->page_increment = child_allocation.width * 0.9;
 733
 734   viewport->vadjustment->page_size = child_allocation.height;
 735   viewport->vadjustment->step_increment = child_allocation.height * 0.1;
 736   viewport->vadjustment->page_increment = child_allocation.height * 0.9;
 737
 738   hval = viewport->hadjustment->value;
 739   vval = viewport->vadjustment->value;
 740
 741   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 742     {
 743       GtkRequisition child_requisition;
 744       gtk_widget_get_child_requisition (bin->child, &child_requisition);
 745
 746       viewport->hadjustment->lower = 0;
 747       viewport->hadjustment->upper = MAX (child_requisition.width,
 748                                           child_allocation.width);
 749
 750       hval = CLAMP (hval, 0,
 751                     viewport->hadjustment->upper -
 752                     viewport->hadjustment->page_size);
 753
 754       viewport->vadjustment->lower = 0;
 755       viewport->vadjustment->upper = MAX (child_requisition.height,
 756                                           child_allocation.height);
 757
 758       vval = CLAMP (vval, 0,
 759                     viewport->vadjustment->upper -
 760                     viewport->vadjustment->page_size);
 761     }
 762
 763   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 764     {
 765       child_allocation.x = 0;
 766       child_allocation.y = 0;
 767
 768       child_allocation.width = viewport->hadjustment->upper;
 769       child_allocation.height = viewport->vadjustment->upper;
 770
 771       if (GTK_WIDGET_REALIZED (widget))
 772         gdk_window_resize (viewport->bin_window,
 773                            child_allocation.width,
 774                            child_allocation.height);
 775
 776       child_allocation.x = 0;
 777       child_allocation.y = 0;
 778       gtk_widget_size_allocate (bin->child, &child_allocation);
 779     }
 780
 781   gtk_adjustment_changed (viewport->hadjustment);
 782   gtk_adjustment_changed (viewport->vadjustment);
 783   if (viewport->hadjustment->value != hval)
 784     {
 785       viewport->hadjustment->value = hval;
 786       gtk_adjustment_value_changed (viewport->hadjustment);
 787     }
 788   if (viewport->vadjustment->value != vval)
 789     {
 790       viewport->vadjustment->value = vval;
 791       gtk_adjustment_value_changed (viewport->vadjustment);
 792     }
 793 }
 794
 795 static void
 796 gtk_viewport_adjustment_changed (GtkAdjustment *adjustment,
 797                                  gpointer       data)
 798 {
 799   GtkViewport *viewport;
 800
 801   g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 802   g_return_if_fail (GTK_IS_VIEWPORT (data));
 803
 804   viewport = GTK_VIEWPORT (data);
 805 }
 806
 807 static void
 808 gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
 809                                        gpointer       data)
 810 {
 811   GtkViewport *viewport;
 812   GtkBin *bin;
 813   GtkAllocation child_allocation;
 814
 815   g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 816   g_return_if_fail (GTK_IS_VIEWPORT (data));
 817
 818   viewport = GTK_VIEWPORT (data);
 819   bin = GTK_BIN (data);
 820
 821   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 822     {
 823       child_allocation.x = 0;
 824       child_allocation.y = 0;
 825
 826       if (viewport->hadjustment->lower != (viewport->hadjustment->upper -
 827                                            viewport->hadjustment->page_size))
 828         child_allocation.x =  viewport->hadjustment->lower - viewport->hadjustment->value;
 829
 830       if (viewport->vadjustment->lower != (viewport->vadjustment->upper -
 831                                            viewport->vadjustment->page_size))
 832         child_allocation.y = viewport->vadjustment->lower - viewport->vadjustment->value;
 833
 834       if (GTK_WIDGET_REALIZED (viewport))
 835         {
 836           gdk_window_move (viewport->bin_window,
 837                            child_allocation.x,
 838                            child_allocation.y);
 839
 840           gdk_window_process_updates (viewport->bin_window, TRUE);
 841         }
 842     }
 843 }
 844
 845 static void
 846 gtk_viewport_style_set (GtkWidget *widget,
 847                         GtkStyle  *previous_style)
 848 {
 849    GtkViewport *viewport;
 850
 851    if (GTK_WIDGET_REALIZED (widget) &&
 852        !GTK_WIDGET_NO_WINDOW (widget))
 853      {
 854         viewport = GTK_VIEWPORT (widget);
 855
 856         gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 857         gtk_style_set_background (widget->style, widget->window, widget->state);
 858      }
 859 }