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 Library 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  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library 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 1997-1999.  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
  30 enum {
  31   ARG_0,
  32   ARG_HADJUSTMENT,
  33   ARG_VADJUSTMENT,
  34   ARG_SHADOW_TYPE
  35 };
  36
  37
  38 static void gtk_viewport_class_init               (GtkViewportClass *klass);
  39 static void gtk_viewport_init                     (GtkViewport      *viewport);
  40 static void gtk_viewport_destroy                  (GtkObject        *object);
  41 static void gtk_viewport_set_arg                  (GtkObject        *object,
  42                                                    GtkArg           *arg,
  43                                                    guint             arg_id);
  44 static void gtk_viewport_get_arg                  (GtkObject        *object,
  45                                                    GtkArg           *arg,
  46                                                    guint             arg_id);
  47 static void gtk_viewport_set_scroll_adjustments   (GtkViewport      *viewport,
  48                                                    GtkAdjustment    *hadjustment,
  49                                                    GtkAdjustment    *vadjustment);
  50 static void gtk_viewport_map                      (GtkWidget        *widget);
  51 static void gtk_viewport_unmap                    (GtkWidget        *widget);
  52 static void gtk_viewport_realize                  (GtkWidget        *widget);
  53 static void gtk_viewport_unrealize                (GtkWidget        *widget);
  54 static void gtk_viewport_paint                    (GtkWidget        *widget,
  55                                                    GdkRectangle     *area);
  56 static void gtk_viewport_draw                     (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   GtkWidgetClass *widget_class;
 105   GtkContainerClass *container_class;
 106
 107   object_class = (GtkObjectClass*) class;
 108   widget_class = (GtkWidgetClass*) class;
 109   container_class = (GtkContainerClass*) class;
 110   parent_class = (GtkBinClass*) gtk_type_class (GTK_TYPE_BIN);
 111
 112   object_class->set_arg = gtk_viewport_set_arg;
 113   object_class->get_arg = gtk_viewport_get_arg;
 114   object_class->destroy = gtk_viewport_destroy;
 115
 116   widget_class->map = gtk_viewport_map;
 117   widget_class->unmap = gtk_viewport_unmap;
 118   widget_class->realize = gtk_viewport_realize;
 119   widget_class->unrealize = gtk_viewport_unrealize;
 120   widget_class->draw = gtk_viewport_draw;
 121   widget_class->expose_event = gtk_viewport_expose;
 122   widget_class->size_request = gtk_viewport_size_request;
 123   widget_class->size_allocate = gtk_viewport_size_allocate;
 124   widget_class->style_set = gtk_viewport_style_set;
 125
 126   container_class->add = gtk_viewport_add;
 127
 128   class->set_scroll_adjustments = gtk_viewport_set_scroll_adjustments;
 129
 130   gtk_object_add_arg_type ("GtkViewport::hadjustment",
 131                            GTK_TYPE_ADJUSTMENT,
 132                            GTK_ARG_READWRITE,
 133                            ARG_HADJUSTMENT);
 134   gtk_object_add_arg_type ("GtkViewport::vadjustment",
 135                            GTK_TYPE_ADJUSTMENT,
 136                            GTK_ARG_READWRITE,
 137                            ARG_VADJUSTMENT);
 138   gtk_object_add_arg_type ("GtkViewport::shadow_type",
 139                            GTK_TYPE_SHADOW_TYPE,
 140                            GTK_ARG_READWRITE,
 141                            ARG_SHADOW_TYPE);
 142
 143   widget_class->set_scroll_adjustments_signal =
 144     gtk_signal_new ("set_scroll_adjustments",
 145                     GTK_RUN_LAST,
 146                     GTK_CLASS_TYPE (object_class),
 147                     GTK_SIGNAL_OFFSET (GtkViewportClass, set_scroll_adjustments),
 148                     gtk_marshal_NONE__POINTER_POINTER,
 149                     GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
 150 }
 151
 152 static void
 153 gtk_viewport_set_arg (GtkObject        *object,
 154                       GtkArg           *arg,
 155                       guint             arg_id)
 156 {
 157   GtkViewport *viewport;
 158
 159   viewport = GTK_VIEWPORT (object);
 160
 161   switch (arg_id)
 162     {
 163     case ARG_HADJUSTMENT:
 164       gtk_viewport_set_hadjustment (viewport, GTK_VALUE_POINTER (*arg));
 165       break;
 166     case ARG_VADJUSTMENT:
 167       gtk_viewport_set_vadjustment (viewport, GTK_VALUE_POINTER (*arg));
 168       break;
 169     case ARG_SHADOW_TYPE:
 170       gtk_viewport_set_shadow_type (viewport, GTK_VALUE_ENUM (*arg));
 171       break;
 172     default:
 173       break;
 174     }
 175 }
 176
 177 static void
 178 gtk_viewport_get_arg (GtkObject        *object,
 179                       GtkArg           *arg,
 180                       guint             arg_id)
 181 {
 182   GtkViewport *viewport;
 183
 184   viewport = GTK_VIEWPORT (object);
 185
 186   switch (arg_id)
 187     {
 188     case ARG_HADJUSTMENT:
 189       GTK_VALUE_POINTER (*arg) = viewport->hadjustment;
 190       break;
 191     case ARG_VADJUSTMENT:
 192       GTK_VALUE_POINTER (*arg) = viewport->vadjustment;
 193       break;
 194     case ARG_SHADOW_TYPE:
 195       GTK_VALUE_ENUM (*arg) = viewport->shadow_type;
 196       break;
 197     default:
 198       arg->type = GTK_TYPE_INVALID;
 199       break;
 200     }
 201 }
 202
 203 static void
 204 gtk_viewport_init (GtkViewport *viewport)
 205 {
 206   GTK_WIDGET_UNSET_FLAGS (viewport, GTK_NO_WINDOW);
 207
 208   gtk_container_set_resize_mode (GTK_CONTAINER (viewport), GTK_RESIZE_QUEUE);
 209
 210   viewport->shadow_type = GTK_SHADOW_IN;
 211   viewport->view_window = NULL;
 212   viewport->bin_window = NULL;
 213   viewport->hadjustment = NULL;
 214   viewport->vadjustment = NULL;
 215 }
 216
 217 GtkWidget*
 218 gtk_viewport_new (GtkAdjustment *hadjustment,
 219                   GtkAdjustment *vadjustment)
 220 {
 221   GtkWidget *viewport;
 222
 223   viewport = gtk_widget_new (GTK_TYPE_VIEWPORT,
 224                              "hadjustment", hadjustment,
 225                              "vadjustment", vadjustment,
 226                              NULL);
 227
 228   return viewport;
 229 }
 230
 231 static void
 232 gtk_viewport_destroy (GtkObject *object)
 233 {
 234   GtkViewport *viewport = GTK_VIEWPORT (object);
 235
 236   if (viewport->hadjustment)
 237     {
 238       gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->hadjustment), viewport);
 239       gtk_object_unref (GTK_OBJECT (viewport->hadjustment));
 240       viewport->hadjustment = NULL;
 241     }
 242   if (viewport->vadjustment)
 243     {
 244       gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->vadjustment), viewport);
 245       gtk_object_unref (GTK_OBJECT (viewport->vadjustment));
 246       viewport->vadjustment = NULL;
 247     }
 248
 249   GTK_OBJECT_CLASS (parent_class)->destroy (object);
 250 }
 251
 252 GtkAdjustment*
 253 gtk_viewport_get_hadjustment (GtkViewport *viewport)
 254 {
 255   g_return_val_if_fail (viewport != NULL, NULL);
 256   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 257
 258   if (!viewport->hadjustment)
 259     gtk_viewport_set_hadjustment (viewport, NULL);
 260
 261   return viewport->hadjustment;
 262 }
 263
 264 GtkAdjustment*
 265 gtk_viewport_get_vadjustment (GtkViewport *viewport)
 266 {
 267   g_return_val_if_fail (viewport != NULL, NULL);
 268   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 269
 270   if (!viewport->vadjustment)
 271     gtk_viewport_set_vadjustment (viewport, NULL);
 272
 273   return viewport->vadjustment;
 274 }
 275
 276 void
 277 gtk_viewport_set_hadjustment (GtkViewport   *viewport,
 278                               GtkAdjustment *adjustment)
 279 {
 280   g_return_if_fail (viewport != NULL);
 281   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 282   if (adjustment)
 283     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 284
 285   if (viewport->hadjustment && viewport->hadjustment != adjustment)
 286     {
 287       gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->hadjustment), viewport);
 288       gtk_object_unref (GTK_OBJECT (viewport->hadjustment));
 289       viewport->hadjustment = NULL;
 290     }
 291
 292   if (!adjustment)
 293     adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
 294                                                      0.0, 0.0, 0.0));
 295
 296   if (viewport->hadjustment != adjustment)
 297     {
 298       viewport->hadjustment = adjustment;
 299       gtk_object_ref (GTK_OBJECT (viewport->hadjustment));
 300       gtk_object_sink (GTK_OBJECT (viewport->hadjustment));
 301
 302       gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
 303                           (GtkSignalFunc) gtk_viewport_adjustment_changed,
 304                           (gpointer) viewport);
 305       gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
 306                           (GtkSignalFunc) gtk_viewport_adjustment_value_changed,
 307                           (gpointer) viewport);
 308
 309       gtk_viewport_adjustment_changed (adjustment, viewport);
 310     }
 311 }
 312
 313 void
 314 gtk_viewport_set_vadjustment (GtkViewport   *viewport,
 315                               GtkAdjustment *adjustment)
 316 {
 317   g_return_if_fail (viewport != NULL);
 318   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 319   if (adjustment)
 320     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 321
 322   if (viewport->vadjustment && viewport->vadjustment != adjustment)
 323     {
 324       gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->vadjustment), viewport);
 325       gtk_object_unref (GTK_OBJECT (viewport->vadjustment));
 326       viewport->vadjustment = NULL;
 327     }
 328
 329   if (!adjustment)
 330     adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
 331                                                      0.0, 0.0, 0.0));
 332
 333   if (viewport->vadjustment != adjustment)
 334     {
 335       viewport->vadjustment = adjustment;
 336       gtk_object_ref (GTK_OBJECT (viewport->vadjustment));
 337       gtk_object_sink (GTK_OBJECT (viewport->vadjustment));
 338
 339       gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
 340                           (GtkSignalFunc) gtk_viewport_adjustment_changed,
 341                           (gpointer) viewport);
 342       gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
 343                           (GtkSignalFunc) gtk_viewport_adjustment_value_changed,
 344                           (gpointer) viewport);
 345
 346       gtk_viewport_adjustment_changed (adjustment, viewport);
 347     }
 348 }
 349
 350 static void
 351 gtk_viewport_set_scroll_adjustments (GtkViewport      *viewport,
 352                                      GtkAdjustment    *hadjustment,
 353                                      GtkAdjustment    *vadjustment)
 354 {
 355   if (viewport->hadjustment != hadjustment)
 356     gtk_viewport_set_hadjustment (viewport, hadjustment);
 357   if (viewport->vadjustment != vadjustment)
 358     gtk_viewport_set_vadjustment (viewport, vadjustment);
 359 }
 360
 361 void
 362 gtk_viewport_set_shadow_type (GtkViewport   *viewport,
 363                               GtkShadowType  type)
 364 {
 365   g_return_if_fail (viewport != NULL);
 366   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 367
 368   if ((GtkShadowType) viewport->shadow_type != type)
 369     {
 370       viewport->shadow_type = type;
 371
 372       if (GTK_WIDGET_VISIBLE (viewport))
 373         {
 374           gtk_widget_size_allocate (GTK_WIDGET (viewport), &(GTK_WIDGET (viewport)->allocation));
 375           gtk_widget_queue_draw (GTK_WIDGET (viewport));
 376         }
 377     }
 378 }
 379
 380
 381 static void
 382 gtk_viewport_map (GtkWidget *widget)
 383 {
 384   GtkBin *bin;
 385
 386   g_return_if_fail (widget != NULL);
 387   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 388
 389   GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 390   bin = GTK_BIN (widget);
 391
 392   if (bin->child &&
 393       GTK_WIDGET_VISIBLE (bin->child) &&
 394       !GTK_WIDGET_MAPPED (bin->child))
 395     gtk_widget_map (bin->child);
 396
 397   gdk_window_show (widget->window);
 398 }
 399
 400 static void
 401 gtk_viewport_unmap (GtkWidget *widget)
 402 {
 403   g_return_if_fail (widget != NULL);
 404   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 405
 406   GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);
 407
 408   gdk_window_hide (widget->window);
 409 }
 410
 411 static void
 412 gtk_viewport_realize (GtkWidget *widget)
 413 {
 414   GtkBin *bin;
 415   GtkViewport *viewport;
 416   GdkWindowAttr attributes;
 417   gint attributes_mask;
 418   gint event_mask;
 419   gint border_width;
 420
 421   g_return_if_fail (widget != NULL);
 422   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 423
 424   border_width = GTK_CONTAINER (widget)->border_width;
 425
 426   bin = GTK_BIN (widget);
 427   viewport = GTK_VIEWPORT (widget);
 428   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 429
 430   attributes.x = widget->allocation.x + border_width;
 431   attributes.y = widget->allocation.y + border_width;
 432   attributes.width = widget->allocation.width - border_width * 2;
 433   attributes.height = widget->allocation.height - border_width * 2;
 434   attributes.window_type = GDK_WINDOW_CHILD;
 435   attributes.wclass = GDK_INPUT_OUTPUT;
 436   attributes.visual = gtk_widget_get_visual (widget);
 437   attributes.colormap = gtk_widget_get_colormap (widget);
 438
 439   event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 440   /* We select on button_press_mask so that button 4-5 scrolls are trapped.
 441    */
 442   attributes.event_mask = event_mask | GDK_BUTTON_PRESS_MASK;
 443
 444   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 445
 446   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 447                                    &attributes, attributes_mask);
 448   gdk_window_set_user_data (widget->window, viewport);
 449
 450   if (viewport->shadow_type != GTK_SHADOW_NONE)
 451     {
 452       attributes.x = widget->style->xthickness;
 453       attributes.y = widget->style->ythickness;
 454     }
 455   else
 456     {
 457       attributes.x = 0;
 458       attributes.y = 0;
 459     }
 460
 461   attributes.width = MAX (1, (gint)widget->allocation.width - attributes.x * 2 - border_width * 2);
 462   attributes.height = MAX (1, (gint)widget->allocation.height - attributes.y * 2 - border_width * 2);
 463   attributes.event_mask = 0;
 464
 465   viewport->view_window = gdk_window_new (widget->window, &attributes, attributes_mask);
 466   gdk_window_set_user_data (viewport->view_window, viewport);
 467
 468   attributes.x = 0;
 469   attributes.y = 0;
 470
 471   if (bin->child)
 472     {
 473       attributes.width = viewport->hadjustment->upper;
 474       attributes.height = viewport->vadjustment->upper;
 475     }
 476
 477   attributes.event_mask = event_mask;
 478
 479   viewport->bin_window = gdk_window_new (viewport->view_window, &attributes, attributes_mask);
 480   gdk_window_set_user_data (viewport->bin_window, viewport);
 481
 482   if (bin->child)
 483     gtk_widget_set_parent_window (bin->child, viewport->bin_window);
 484
 485   widget->style = gtk_style_attach (widget->style, widget->window);
 486   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 487   gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 488
 489    gtk_paint_flat_box(widget->style, viewport->bin_window, GTK_STATE_NORMAL,
 490                       GTK_SHADOW_NONE,
 491                       NULL, widget, "viewportbin",
 492                       0, 0, -1, -1);
 493
 494   gdk_window_show (viewport->bin_window);
 495   gdk_window_show (viewport->view_window);
 496 }
 497
 498 static void
 499 gtk_viewport_unrealize (GtkWidget *widget)
 500 {
 501   GtkViewport *viewport;
 502
 503   g_return_if_fail (widget != NULL);
 504   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 505
 506   viewport = GTK_VIEWPORT (widget);
 507
 508   gdk_window_set_user_data (viewport->view_window, NULL);
 509   gdk_window_destroy (viewport->view_window);
 510   viewport->view_window = NULL;
 511
 512   gdk_window_set_user_data (viewport->bin_window, NULL);
 513   gdk_window_destroy (viewport->bin_window);
 514   viewport->bin_window = NULL;
 515
 516   if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 517     (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 518 }
 519
 520 static void
 521 gtk_viewport_paint (GtkWidget    *widget,
 522                     GdkRectangle *area)
 523 {
 524   GtkViewport *viewport;
 525
 526   g_return_if_fail (widget != NULL);
 527   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 528   g_return_if_fail (area != NULL);
 529
 530   if (GTK_WIDGET_DRAWABLE (widget))
 531     {
 532       viewport = GTK_VIEWPORT (widget);
 533
 534       gtk_draw_shadow (widget->style, widget->window,
 535                        GTK_STATE_NORMAL, viewport->shadow_type,
 536                        0, 0, -1, -1);
 537     }
 538 }
 539
 540 static void
 541 gtk_viewport_draw (GtkWidget    *widget,
 542                    GdkRectangle *area)
 543 {
 544   GtkViewport *viewport;
 545   GtkBin *bin;
 546   GdkRectangle tmp_area;
 547   GdkRectangle child_area;
 548   gint border_width;
 549
 550   g_return_if_fail (widget != NULL);
 551   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 552   g_return_if_fail (area != NULL);
 553
 554   if (GTK_WIDGET_DRAWABLE (widget))
 555     {
 556       viewport = GTK_VIEWPORT (widget);
 557       bin = GTK_BIN (widget);
 558
 559       border_width = GTK_CONTAINER (widget)->border_width;
 560
 561       tmp_area = *area;
 562       tmp_area.x -= border_width;
 563       tmp_area.y -= border_width;
 564
 565       gtk_viewport_paint (widget, &tmp_area);
 566
 567       tmp_area.x += viewport->hadjustment->value - widget->style->xthickness;
 568       tmp_area.y += viewport->vadjustment->value - widget->style->ythickness;
 569
 570       gtk_paint_flat_box(widget->style, viewport->bin_window,
 571                          GTK_STATE_NORMAL, GTK_SHADOW_NONE,
 572                          &tmp_area, widget, "viewportbin",
 573                          0, 0, -1, -1);
 574
 575       if (bin->child)
 576         {
 577           if (gtk_widget_intersect (bin->child, &tmp_area, &child_area))
 578             gtk_widget_draw (bin->child, &child_area);
 579         }
 580     }
 581 }
 582
 583 static gint
 584 gtk_viewport_expose (GtkWidget      *widget,
 585                      GdkEventExpose *event)
 586 {
 587   GtkViewport *viewport;
 588   GtkBin *bin;
 589   GdkEventExpose child_event;
 590
 591   g_return_val_if_fail (widget != NULL, FALSE);
 592   g_return_val_if_fail (GTK_IS_VIEWPORT (widget), FALSE);
 593   g_return_val_if_fail (event != NULL, FALSE);
 594
 595   if (GTK_WIDGET_DRAWABLE (widget))
 596     {
 597       viewport = GTK_VIEWPORT (widget);
 598       bin = GTK_BIN (widget);
 599
 600       if (event->window == widget->window)
 601         gtk_viewport_paint (widget, &event->area);
 602       else if (event->window == viewport->bin_window)
 603         {
 604           child_event = *event;
 605
 606           gtk_paint_flat_box(widget->style, viewport->bin_window,
 607                              GTK_STATE_NORMAL, GTK_SHADOW_NONE,
 608                              &event->area, widget, "viewportbin",
 609                              0, 0, -1, -1);
 610
 611           if ((bin->child != NULL) &&
 612               GTK_WIDGET_NO_WINDOW (bin->child) &&
 613               gtk_widget_intersect (bin->child, &event->area, &child_event.area))
 614             gtk_widget_event (bin->child, (GdkEvent*) &child_event);
 615         }
 616
 617
 618     }
 619
 620   return FALSE;
 621 }
 622
 623 static void
 624 gtk_viewport_add (GtkContainer *container,
 625                   GtkWidget    *child)
 626 {
 627   GtkBin *bin;
 628
 629   g_return_if_fail (container != NULL);
 630   g_return_if_fail (GTK_IS_VIEWPORT (container));
 631   g_return_if_fail (child != NULL);
 632
 633   bin = GTK_BIN (container);
 634   g_return_if_fail (bin->child == NULL);
 635
 636   gtk_widget_set_parent_window (child, GTK_VIEWPORT (bin)->bin_window);
 637
 638   GTK_CONTAINER_CLASS (parent_class)->add (container, child);
 639 }
 640
 641 static void
 642 gtk_viewport_size_request (GtkWidget      *widget,
 643                            GtkRequisition *requisition)
 644 {
 645   GtkViewport *viewport;
 646   GtkBin *bin;
 647   GtkRequisition child_requisition;
 648
 649   g_return_if_fail (widget != NULL);
 650   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 651   g_return_if_fail (requisition != NULL);
 652
 653   viewport = GTK_VIEWPORT (widget);
 654   bin = GTK_BIN (widget);
 655
 656   requisition->width = (GTK_CONTAINER (widget)->border_width +
 657                         GTK_WIDGET (widget)->style->xthickness) * 2 + 5;
 658
 659   requisition->height = (GTK_CONTAINER (widget)->border_width * 2 +
 660                          GTK_WIDGET (widget)->style->ythickness) * 2 + 5;
 661
 662   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 663     {
 664       gtk_widget_size_request (bin->child, &child_requisition);
 665       requisition->width += child_requisition.width;
 666       requisition->height += child_requisition.height;
 667     }
 668 }
 669
 670 static void
 671 gtk_viewport_size_allocate (GtkWidget     *widget,
 672                             GtkAllocation *allocation)
 673 {
 674   GtkViewport *viewport;
 675   GtkBin *bin;
 676   GtkAllocation child_allocation;
 677   gint hval, vval;
 678   gint border_width;
 679
 680   g_return_if_fail (widget != NULL);
 681   g_return_if_fail (GTK_IS_VIEWPORT (widget));
 682   g_return_if_fail (allocation != NULL);
 683
 684   widget->allocation = *allocation;
 685   viewport = GTK_VIEWPORT (widget);
 686   bin = GTK_BIN (widget);
 687
 688   /* demand creation */
 689   if (!viewport->hadjustment)
 690     gtk_viewport_set_hadjustment (viewport, NULL);
 691   if (!viewport->vadjustment)
 692     gtk_viewport_set_hadjustment (viewport, NULL);
 693
 694   border_width = GTK_CONTAINER (widget)->border_width;
 695
 696   child_allocation.x = 0;
 697   child_allocation.y = 0;
 698
 699   if (viewport->shadow_type != GTK_SHADOW_NONE)
 700     {
 701       child_allocation.x = GTK_WIDGET (viewport)->style->xthickness;
 702       child_allocation.y = GTK_WIDGET (viewport)->style->ythickness;
 703     }
 704
 705   child_allocation.width = MAX (1, allocation->width - child_allocation.x * 2 - border_width * 2);
 706   child_allocation.height = MAX (1, allocation->height - child_allocation.y * 2 - border_width * 2);
 707
 708   if (GTK_WIDGET_REALIZED (widget))
 709     {
 710       gdk_window_move_resize (widget->window,
 711                               allocation->x + border_width,
 712                               allocation->y + border_width,
 713                               allocation->width - border_width * 2,
 714                               allocation->height - border_width * 2);
 715
 716       gdk_window_move_resize (viewport->view_window,
 717                               child_allocation.x,
 718                               child_allocation.y,
 719                               child_allocation.width,
 720                               child_allocation.height);
 721     }
 722
 723   viewport->hadjustment->page_size = child_allocation.width;
 724   viewport->hadjustment->page_increment = viewport->hadjustment->page_size / 2;
 725   viewport->hadjustment->step_increment = 10;
 726
 727   viewport->vadjustment->page_size = child_allocation.height;
 728   viewport->vadjustment->page_increment = viewport->vadjustment->page_size / 2;
 729   viewport->vadjustment->step_increment = 10;
 730
 731   hval = viewport->hadjustment->value;
 732   vval = viewport->vadjustment->value;
 733
 734   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 735     {
 736       GtkRequisition child_requisition;
 737       gtk_widget_get_child_requisition (bin->child, &child_requisition);
 738
 739       viewport->hadjustment->lower = 0;
 740       viewport->hadjustment->upper = MAX (child_requisition.width,
 741                                           child_allocation.width);
 742
 743       hval = CLAMP (hval, 0,
 744                     viewport->hadjustment->upper -
 745                     viewport->hadjustment->page_size);
 746
 747       viewport->vadjustment->lower = 0;
 748       viewport->vadjustment->upper = MAX (child_requisition.height,
 749                                           child_allocation.height);
 750
 751       vval = CLAMP (vval, 0,
 752                     viewport->vadjustment->upper -
 753                     viewport->vadjustment->page_size);
 754     }
 755
 756   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 757     {
 758       child_allocation.x = 0;
 759       child_allocation.y = 0;
 760
 761       child_allocation.width = viewport->hadjustment->upper;
 762       child_allocation.height = viewport->vadjustment->upper;
 763
 764       if (GTK_WIDGET_REALIZED (widget))
 765         gdk_window_resize (viewport->bin_window,
 766                            child_allocation.width,
 767                            child_allocation.height);
 768
 769       child_allocation.x = 0;
 770       child_allocation.y = 0;
 771       gtk_widget_size_allocate (bin->child, &child_allocation);
 772     }
 773
 774   gtk_signal_emit_by_name (GTK_OBJECT (viewport->hadjustment), "changed");
 775   gtk_signal_emit_by_name (GTK_OBJECT (viewport->vadjustment), "changed");
 776   if (viewport->hadjustment->value != hval)
 777     {
 778       viewport->hadjustment->value = hval;
 779       gtk_signal_emit_by_name (GTK_OBJECT (viewport->hadjustment), "value_changed");
 780     }
 781   if (viewport->vadjustment->value != vval)
 782     {
 783       viewport->vadjustment->value = vval;
 784       gtk_signal_emit_by_name (GTK_OBJECT (viewport->vadjustment), "value_changed");
 785     }
 786 }
 787
 788 static void
 789 gtk_viewport_adjustment_changed (GtkAdjustment *adjustment,
 790                                  gpointer       data)
 791 {
 792   GtkViewport *viewport;
 793
 794   g_return_if_fail (adjustment != NULL);
 795   g_return_if_fail (data != NULL);
 796   g_return_if_fail (GTK_IS_VIEWPORT (data));
 797
 798   viewport = GTK_VIEWPORT (data);
 799 }
 800
 801 static void
 802 gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
 803                                        gpointer       data)
 804 {
 805   GtkViewport *viewport;
 806   GtkBin *bin;
 807   GtkAllocation child_allocation;
 808
 809   g_return_if_fail (adjustment != NULL);
 810   g_return_if_fail (data != NULL);
 811   g_return_if_fail (GTK_IS_VIEWPORT (data));
 812
 813   viewport = GTK_VIEWPORT (data);
 814   bin = GTK_BIN (data);
 815
 816   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 817     {
 818       child_allocation.x = 0;
 819       child_allocation.y = 0;
 820
 821       if (viewport->hadjustment->lower != (viewport->hadjustment->upper -
 822                                            viewport->hadjustment->page_size))
 823         child_allocation.x =  viewport->hadjustment->lower - viewport->hadjustment->value;
 824
 825       if (viewport->vadjustment->lower != (viewport->vadjustment->upper -
 826                                            viewport->vadjustment->page_size))
 827         child_allocation.y = viewport->vadjustment->lower - viewport->vadjustment->value;
 828
 829       if (GTK_WIDGET_REALIZED (viewport))
 830         {
 831           gdk_window_move (viewport->bin_window,
 832                            child_allocation.x,
 833                            child_allocation.y);
 834
 835           gdk_window_process_updates (viewport->bin_window, TRUE);
 836         }
 837     }
 838 }
 839
 840 static void
 841 gtk_viewport_style_set (GtkWidget *widget,
 842                         GtkStyle  *previous_style)
 843 {
 844    GtkViewport *viewport;
 845
 846    if (GTK_WIDGET_REALIZED (widget) &&
 847        !GTK_WIDGET_NO_WINDOW (widget))
 848      {
 849         viewport = GTK_VIEWPORT (widget);
 850
 851         gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
 852         gtk_style_set_background (widget->style, widget->window, widget->state);
 853      }
 854 }