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