Pileus Git - ~andy/gtk/blob - gtk/gtklayout.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  * GtkLayout: Widget for scrolling of arbitrary-sized areas.
  20  *
  21  * Copyright Owen Taylor, 1998
  22  */
  23
  24 /*
  25  * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
  26  * file for a list of people on the GTK+ Team.  See the ChangeLog
  27  * files for a list of changes.  These files are distributed with
  28  * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
  29  */
  30
  31 #include "gdkconfig.h"
  32
  33 #include "gtklayout.h"
  34 #include "gtksignal.h"
  35 #include "gtkprivate.h"
  36 #include "gtkintl.h"
  37
  38 typedef struct _GtkLayoutChild   GtkLayoutChild;
  39
  40 struct _GtkLayoutChild {
  41   GtkWidget *widget;
  42   gint x;
  43   gint y;
  44 };
  45
  46 enum {
  47    PROP_0,
  48    PROP_HADJUSTMENT,
  49    PROP_VADJUSTMENT,
  50    PROP_WIDTH,
  51    PROP_HEIGHT
  52 };
  53
  54 static void     gtk_layout_class_init         (GtkLayoutClass *class);
  55 static void     gtk_layout_get_property       (GObject        *object,
  56                                                guint          prop_id,
  57                                                GValue         *value,
  58                                                GParamSpec     *pspec);
  59 static void     gtk_layout_set_property       (GObject        *object,
  60                                                guint          prop_id,
  61                                                const GValue   *value,
  62                                                GParamSpec     *pspec);
  63 static void     gtk_layout_init               (GtkLayout      *layout);
  64
  65 static void     gtk_layout_finalize           (GObject        *object);
  66 static void     gtk_layout_realize            (GtkWidget      *widget);
  67 static void     gtk_layout_unrealize          (GtkWidget      *widget);
  68 static void     gtk_layout_map                (GtkWidget      *widget);
  69 static void     gtk_layout_size_request       (GtkWidget      *widget,
  70                                                GtkRequisition *requisition);
  71 static void     gtk_layout_size_allocate      (GtkWidget      *widget,
  72                                                GtkAllocation  *allocation);
  73 static gint     gtk_layout_expose             (GtkWidget      *widget,
  74                                                GdkEventExpose *event);
  75
  76 static void     gtk_layout_remove             (GtkContainer *container,
  77                                                GtkWidget    *widget);
  78 static void     gtk_layout_forall             (GtkContainer *container,
  79                                                gboolean      include_internals,
  80                                                GtkCallback   callback,
  81                                                gpointer      callback_data);
  82 static void     gtk_layout_set_adjustments    (GtkLayout     *layout,
  83                                                GtkAdjustment *hadj,
  84                                                GtkAdjustment *vadj);
  85
  86 static void     gtk_layout_allocate_child     (GtkLayout      *layout,
  87                                                GtkLayoutChild *child);
  88
  89
  90 static void     gtk_layout_adjustment_changed (GtkAdjustment  *adjustment,
  91                                                GtkLayout      *layout);
  92
  93 static GtkWidgetClass *parent_class = NULL;
  94
  95 /* Public interface
  96  */
  97
  98 GtkWidget*
  99 gtk_layout_new (GtkAdjustment *hadjustment,
 100                 GtkAdjustment *vadjustment)
 101 {
 102   GtkLayout *layout;
 103
 104   layout = gtk_type_new (GTK_TYPE_LAYOUT);
 105
 106   gtk_layout_set_adjustments (layout, hadjustment, vadjustment);
 107
 108   return GTK_WIDGET (layout);
 109 }
 110
 111 GtkAdjustment*
 112 gtk_layout_get_hadjustment (GtkLayout     *layout)
 113 {
 114   g_return_val_if_fail (GTK_IS_LAYOUT (layout), NULL);
 115
 116   return layout->hadjustment;
 117 }
 118 GtkAdjustment*
 119 gtk_layout_get_vadjustment (GtkLayout     *layout)
 120 {
 121   g_return_val_if_fail (GTK_IS_LAYOUT (layout), NULL);
 122
 123   return layout->vadjustment;
 124 }
 125
 126 static void
 127 gtk_layout_set_adjustments (GtkLayout     *layout,
 128                             GtkAdjustment *hadj,
 129                             GtkAdjustment *vadj)
 130 {
 131   gboolean need_adjust = FALSE;
 132
 133   g_return_if_fail (GTK_IS_LAYOUT (layout));
 134
 135   if (hadj)
 136     g_return_if_fail (GTK_IS_ADJUSTMENT (hadj));
 137   else
 138     hadj = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
 139   if (vadj)
 140     g_return_if_fail (GTK_IS_ADJUSTMENT (vadj));
 141   else
 142     vadj = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
 143
 144   if (layout->hadjustment && (layout->hadjustment != hadj))
 145     {
 146       gtk_signal_disconnect_by_data (GTK_OBJECT (layout->hadjustment), layout);
 147       gtk_object_unref (GTK_OBJECT (layout->hadjustment));
 148     }
 149
 150   if (layout->vadjustment && (layout->vadjustment != vadj))
 151     {
 152       gtk_signal_disconnect_by_data (GTK_OBJECT (layout->vadjustment), layout);
 153       gtk_object_unref (GTK_OBJECT (layout->vadjustment));
 154     }
 155
 156   if (layout->hadjustment != hadj)
 157     {
 158       layout->hadjustment = hadj;
 159       gtk_object_ref (GTK_OBJECT (layout->hadjustment));
 160       gtk_object_sink (GTK_OBJECT (layout->hadjustment));
 161
 162       gtk_signal_connect (GTK_OBJECT (layout->hadjustment), "value_changed",
 163                           (GtkSignalFunc) gtk_layout_adjustment_changed,
 164                           layout);
 165       need_adjust = TRUE;
 166     }
 167
 168   if (layout->vadjustment != vadj)
 169     {
 170       layout->vadjustment = vadj;
 171       gtk_object_ref (GTK_OBJECT (layout->vadjustment));
 172       gtk_object_sink (GTK_OBJECT (layout->vadjustment));
 173
 174       gtk_signal_connect (GTK_OBJECT (layout->vadjustment), "value_changed",
 175                           (GtkSignalFunc) gtk_layout_adjustment_changed,
 176                           layout);
 177       need_adjust = TRUE;
 178     }
 179
 180   if (need_adjust)
 181     gtk_layout_adjustment_changed (NULL, layout);
 182 }
 183
 184 static void
 185 gtk_layout_finalize (GObject *object)
 186 {
 187   GtkLayout *layout = GTK_LAYOUT (object);
 188
 189   gtk_object_unref (GTK_OBJECT (layout->hadjustment));
 190   gtk_object_unref (GTK_OBJECT (layout->vadjustment));
 191
 192   G_OBJECT_CLASS (parent_class)->finalize (object);
 193 }
 194
 195 void
 196 gtk_layout_set_hadjustment (GtkLayout     *layout,
 197                             GtkAdjustment *adjustment)
 198 {
 199   g_return_if_fail (GTK_IS_LAYOUT (layout));
 200
 201   gtk_layout_set_adjustments (layout, adjustment, layout->vadjustment);
 202   g_object_notify (G_OBJECT (layout), "hadjustment");
 203 }
 204
 205
 206 void
 207 gtk_layout_set_vadjustment (GtkLayout     *layout,
 208                             GtkAdjustment *adjustment)
 209 {
 210   g_return_if_fail (GTK_IS_LAYOUT (layout));
 211
 212   gtk_layout_set_adjustments (layout, layout->hadjustment, adjustment);
 213   g_object_notify (G_OBJECT (layout), "vadjustment");
 214 }
 215
 216
 217 void
 218 gtk_layout_put (GtkLayout     *layout,
 219                 GtkWidget     *child_widget,
 220                 gint           x,
 221                 gint           y)
 222 {
 223   GtkLayoutChild *child;
 224
 225   g_return_if_fail (GTK_IS_LAYOUT (layout));
 226   g_return_if_fail (GTK_IS_WIDGET (child_widget));
 227
 228   child = g_new (GtkLayoutChild, 1);
 229
 230   child->widget = child_widget;
 231   child->x = x;
 232   child->y = y;
 233
 234   layout->children = g_list_append (layout->children, child);
 235
 236   gtk_widget_set_parent (child_widget, GTK_WIDGET (layout));
 237   if (GTK_WIDGET_REALIZED (layout))
 238     gtk_widget_set_parent_window (child->widget, layout->bin_window);
 239
 240   if (GTK_WIDGET_REALIZED (layout))
 241     gtk_widget_realize (child_widget);
 242
 243   if (GTK_WIDGET_VISIBLE (layout) && GTK_WIDGET_VISIBLE (child_widget))
 244     {
 245       if (GTK_WIDGET_MAPPED (layout))
 246         gtk_widget_map (child_widget);
 247
 248       gtk_widget_queue_resize (child_widget);
 249     }
 250 }
 251
 252 void
 253 gtk_layout_move (GtkLayout     *layout,
 254                  GtkWidget     *child_widget,
 255                  gint           x,
 256                  gint           y)
 257 {
 258   GList *tmp_list;
 259   GtkLayoutChild *child;
 260
 261   g_return_if_fail (GTK_IS_LAYOUT (layout));
 262
 263   tmp_list = layout->children;
 264   while (tmp_list)
 265     {
 266       child = tmp_list->data;
 267       tmp_list = tmp_list->next;
 268
 269       if (child->widget == child_widget)
 270         {
 271           child->x = x;
 272           child->y = y;
 273
 274           if (GTK_WIDGET_VISIBLE (child_widget) && GTK_WIDGET_VISIBLE (layout))
 275             gtk_widget_queue_resize (child_widget);
 276
 277           return;
 278         }
 279     }
 280 }
 281
 282 static void
 283 gtk_layout_set_adjustment_upper (GtkAdjustment *adj,
 284                                  gdouble        upper)
 285 {
 286   if (upper != adj->upper)
 287     {
 288       gdouble min = MAX (0., upper - adj->page_size);
 289       gboolean value_changed = FALSE;
 290
 291       adj->upper = upper;
 292
 293       if (adj->value > min)
 294         {
 295           adj->value = min;
 296           value_changed = TRUE;
 297         }
 298
 299       gtk_signal_emit_by_name (GTK_OBJECT (adj), "changed");
 300       if (value_changed)
 301         gtk_signal_emit_by_name (GTK_OBJECT (adj), "value_changed");
 302     }
 303 }
 304
 305 void
 306 gtk_layout_set_size (GtkLayout     *layout,
 307                      guint          width,
 308                      guint          height)
 309 {
 310   GtkWidget *widget;
 311
 312   g_return_if_fail (GTK_IS_LAYOUT (layout));
 313
 314   widget = GTK_WIDGET (layout);
 315
 316   if (width != layout->width)
 317      {
 318         layout->width = width;
 319         g_object_notify (G_OBJECT (layout), "width");
 320      }
 321   if (height != layout->height)
 322      {
 323         layout->height = height;
 324         g_object_notify (G_OBJECT (layout), "height");
 325      }
 326
 327   gtk_layout_set_adjustment_upper (layout->hadjustment, layout->width);
 328   gtk_layout_set_adjustment_upper (layout->vadjustment, layout->height);
 329
 330   if (GTK_WIDGET_REALIZED (layout))
 331     {
 332       width = MAX (width, widget->allocation.width);
 333       height = MAX (height, widget->allocation.height);
 334       gdk_window_resize (layout->bin_window, width, height);
 335     }
 336 }
 337
 338 /**
 339  * gtk_layout_get_size:
 340  * @layout: a #GtkLayout
 341  * @width: location to store the width set on @layout, or %NULL
 342  * @height: location to store the height set on @layout, or %NULL
 343  *
 344  * Gets the size that has been set on the layout, and that determines
 345  * the total extents of the layout's scrollbar area. See
 346  * gtk_layout_set_size ().
 347  **/
 348 void
 349 gtk_layout_get_size (GtkLayout *layout,
 350                      guint     *width,
 351                      guint     *height)
 352 {
 353   g_return_if_fail (GTK_IS_LAYOUT (layout));
 354
 355   if (width)
 356     *width = layout->width;
 357   if (height)
 358     *height = layout->height;
 359 }
 360
 361 void
 362 gtk_layout_freeze (GtkLayout *layout)
 363 {
 364   g_return_if_fail (GTK_IS_LAYOUT (layout));
 365
 366   layout->freeze_count++;
 367 }
 368
 369 void
 370 gtk_layout_thaw (GtkLayout *layout)
 371 {
 372   g_return_if_fail (GTK_IS_LAYOUT (layout));
 373
 374   if (layout->freeze_count)
 375     if (!(--layout->freeze_count))
 376       gtk_widget_draw (GTK_WIDGET (layout), NULL);
 377 }
 378
 379 /* Basic Object handling procedures
 380  */
 381 GtkType
 382 gtk_layout_get_type (void)
 383 {
 384   static GtkType layout_type = 0;
 385
 386   if (!layout_type)
 387     {
 388       static const GTypeInfo layout_info =
 389       {
 390         sizeof (GtkLayoutClass),
 391         NULL,           /* base_init */
 392         NULL,           /* base_finalize */
 393         (GClassInitFunc) gtk_layout_class_init,
 394         NULL,           /* class_finalize */
 395         NULL,           /* class_data */
 396         sizeof (GtkLayout),
 397         16,             /* n_preallocs */
 398         (GInstanceInitFunc) gtk_layout_init,
 399       };
 400
 401       layout_type = g_type_register_static (GTK_TYPE_CONTAINER, "GtkLayout", &layout_info, 0);
 402     }
 403
 404   return layout_type;
 405 }
 406
 407 static void
 408 gtk_layout_class_init (GtkLayoutClass *class)
 409 {
 410   GObjectClass *gobject_class;
 411   GtkObjectClass *object_class;
 412   GtkWidgetClass *widget_class;
 413   GtkContainerClass *container_class;
 414
 415   gobject_class = (GObjectClass*) class;
 416   object_class = (GtkObjectClass*) class;
 417   widget_class = (GtkWidgetClass*) class;
 418   container_class = (GtkContainerClass*) class;
 419
 420   parent_class = gtk_type_class (GTK_TYPE_CONTAINER);
 421
 422   gobject_class->set_property = gtk_layout_set_property;
 423   gobject_class->get_property = gtk_layout_get_property;
 424   gobject_class->finalize = gtk_layout_finalize;
 425
 426   g_object_class_install_property (gobject_class,
 427                                    PROP_HADJUSTMENT,
 428                                    g_param_spec_object ("hadjustment",
 429                                                         _("Horizontal adjustment"),
 430                                                         _("The GtkAdjustment for the horizontal position."),
 431                                                         GTK_TYPE_ADJUSTMENT,
 432                                                         G_PARAM_READWRITE));
 433
 434   g_object_class_install_property (gobject_class,
 435                                    PROP_VADJUSTMENT,
 436                                    g_param_spec_object ("vadjustment",
 437                                                         _("Vertical adjustment"),
 438                                                         _("The GtkAdjustment for the vertical position."),
 439                                                         GTK_TYPE_ADJUSTMENT,
 440                                                         G_PARAM_READWRITE));
 441
 442   g_object_class_install_property (gobject_class,
 443                                    PROP_WIDTH,
 444                                    g_param_spec_uint ("width",
 445                                                      _("Width"),
 446                                                      _("The width of the layout."),
 447                                                      0,
 448                                                      G_MAXINT,
 449                                                      100,
 450                                                      G_PARAM_READWRITE));
 451   g_object_class_install_property (gobject_class,
 452                                    PROP_HEIGHT,
 453                                    g_param_spec_uint ("height",
 454                                                      _("Height"),
 455                                                      _("The height of the layout."),
 456                                                      0,
 457                                                      G_MAXINT,
 458                                                      100,
 459                                                      G_PARAM_READWRITE));
 460   widget_class->realize = gtk_layout_realize;
 461   widget_class->unrealize = gtk_layout_unrealize;
 462   widget_class->map = gtk_layout_map;
 463   widget_class->size_request = gtk_layout_size_request;
 464   widget_class->size_allocate = gtk_layout_size_allocate;
 465   widget_class->expose_event = gtk_layout_expose;
 466
 467   container_class->remove = gtk_layout_remove;
 468   container_class->forall = gtk_layout_forall;
 469
 470   class->set_scroll_adjustments = gtk_layout_set_adjustments;
 471
 472   widget_class->set_scroll_adjustments_signal =
 473     gtk_signal_new ("set_scroll_adjustments",
 474                     GTK_RUN_LAST,
 475                     GTK_CLASS_TYPE (object_class),
 476                     GTK_SIGNAL_OFFSET (GtkLayoutClass, set_scroll_adjustments),
 477                     gtk_marshal_VOID__OBJECT_OBJECT,
 478                     GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
 479 }
 480
 481 static void
 482 gtk_layout_get_property (GObject     *object,
 483                          guint        prop_id,
 484                          GValue      *value,
 485                          GParamSpec  *pspec)
 486 {
 487   GtkLayout *layout = GTK_LAYOUT (object);
 488
 489   switch (prop_id)
 490     {
 491     case PROP_HADJUSTMENT:
 492       g_value_set_object (value, G_OBJECT (layout->hadjustment));
 493       break;
 494     case PROP_VADJUSTMENT:
 495       g_value_set_object (value, G_OBJECT (layout->vadjustment));
 496       break;
 497     case PROP_WIDTH:
 498       g_value_set_uint (value, layout->width);
 499       break;
 500     case PROP_HEIGHT:
 501       g_value_set_uint (value, layout->height);
 502       break;
 503     default:
 504       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 505       break;
 506     }
 507 }
 508
 509 static void
 510 gtk_layout_set_property (GObject      *object,
 511                          guint         prop_id,
 512                          const GValue *value,
 513                          GParamSpec   *pspec)
 514 {
 515   GtkLayout *layout = GTK_LAYOUT (object);
 516
 517   switch (prop_id)
 518     {
 519     case PROP_HADJUSTMENT:
 520       gtk_layout_set_hadjustment (layout,
 521                                   (GtkAdjustment*) g_value_get_object (value));
 522       break;
 523     case PROP_VADJUSTMENT:
 524       gtk_layout_set_vadjustment (layout,
 525                                   (GtkAdjustment*) g_value_get_object (value));
 526       break;
 527     case PROP_WIDTH:
 528       gtk_layout_set_size (layout, g_value_get_uint (value),
 529                            layout->height);
 530       break;
 531     case PROP_HEIGHT:
 532       gtk_layout_set_size (layout, layout->width,
 533                            g_value_get_uint (value));
 534       break;
 535     default:
 536       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 537       break;
 538     }
 539 }
 540
 541
 542 static void
 543 gtk_layout_init (GtkLayout *layout)
 544 {
 545   layout->children = NULL;
 546
 547   layout->width = 100;
 548   layout->height = 100;
 549
 550   layout->hadjustment = NULL;
 551   layout->vadjustment = NULL;
 552
 553   layout->bin_window = NULL;
 554
 555   layout->scroll_x = 0;
 556   layout->scroll_y = 0;
 557   layout->visibility = GDK_VISIBILITY_PARTIAL;
 558
 559   layout->freeze_count = 0;
 560 }
 561
 562 /* Widget methods
 563  */
 564
 565 static void
 566 gtk_layout_realize (GtkWidget *widget)
 567 {
 568   GList *tmp_list;
 569   GtkLayout *layout;
 570   GdkWindowAttr attributes;
 571   gint attributes_mask;
 572
 573   g_return_if_fail (GTK_IS_LAYOUT (widget));
 574
 575   layout = GTK_LAYOUT (widget);
 576   GTK_WIDGET_SET_FLAGS (layout, GTK_REALIZED);
 577
 578   attributes.window_type = GDK_WINDOW_CHILD;
 579   attributes.x = widget->allocation.x;
 580   attributes.y = widget->allocation.y;
 581   attributes.width = widget->allocation.width;
 582   attributes.height = widget->allocation.height;
 583   attributes.wclass = GDK_INPUT_OUTPUT;
 584   attributes.visual = gtk_widget_get_visual (widget);
 585   attributes.colormap = gtk_widget_get_colormap (widget);
 586   attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;
 587
 588   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 589
 590   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 591                                    &attributes, attributes_mask);
 592   gdk_window_set_user_data (widget->window, widget);
 593
 594   attributes.x = 0;
 595   attributes.y = 0;
 596   attributes.width = MAX (layout->width, widget->allocation.width);
 597   attributes.height = MAX (layout->height, widget->allocation.height);
 598   attributes.event_mask = GDK_EXPOSURE_MASK | GDK_SCROLL_MASK |
 599                           gtk_widget_get_events (widget);
 600
 601   layout->bin_window = gdk_window_new (widget->window,
 602                                         &attributes, attributes_mask);
 603   gdk_window_set_user_data (layout->bin_window, widget);
 604
 605   widget->style = gtk_style_attach (widget->style, widget->window);
 606   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 607   gtk_style_set_background (widget->style, layout->bin_window, GTK_STATE_NORMAL);
 608
 609   tmp_list = layout->children;
 610   while (tmp_list)
 611     {
 612       GtkLayoutChild *child = tmp_list->data;
 613       tmp_list = tmp_list->next;
 614
 615       gtk_widget_set_parent_window (child->widget, layout->bin_window);
 616     }
 617 }
 618
 619 static void
 620 gtk_layout_map (GtkWidget *widget)
 621 {
 622   GList *tmp_list;
 623   GtkLayout *layout;
 624
 625   g_return_if_fail (GTK_IS_LAYOUT (widget));
 626
 627   layout = GTK_LAYOUT (widget);
 628
 629   GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 630
 631   tmp_list = layout->children;
 632   while (tmp_list)
 633     {
 634       GtkLayoutChild *child = tmp_list->data;
 635       tmp_list = tmp_list->next;
 636
 637       if (GTK_WIDGET_VISIBLE (child->widget))
 638         {
 639           if (!GTK_WIDGET_MAPPED (child->widget))
 640             gtk_widget_map (child->widget);
 641         }
 642     }
 643
 644   gdk_window_show (layout->bin_window);
 645   gdk_window_show (widget->window);
 646 }
 647
 648 static void
 649 gtk_layout_unrealize (GtkWidget *widget)
 650 {
 651   GtkLayout *layout;
 652
 653   g_return_if_fail (GTK_IS_LAYOUT (widget));
 654
 655   layout = GTK_LAYOUT (widget);
 656
 657   gdk_window_set_user_data (layout->bin_window, NULL);
 658   gdk_window_destroy (layout->bin_window);
 659   layout->bin_window = NULL;
 660
 661   if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 662     (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 663 }
 664
 665 static void
 666 gtk_layout_size_request (GtkWidget     *widget,
 667                          GtkRequisition *requisition)
 668 {
 669   GList *tmp_list;
 670   GtkLayout *layout;
 671
 672   g_return_if_fail (GTK_IS_LAYOUT (widget));
 673
 674   layout = GTK_LAYOUT (widget);
 675
 676   requisition->width = 0;
 677   requisition->height = 0;
 678
 679   tmp_list = layout->children;
 680
 681   while (tmp_list)
 682     {
 683       GtkLayoutChild *child = tmp_list->data;
 684       GtkRequisition child_requisition;
 685
 686       tmp_list = tmp_list->next;
 687
 688       gtk_widget_size_request (child->widget, &child_requisition);
 689     }
 690 }
 691
 692 static void
 693 gtk_layout_size_allocate (GtkWidget     *widget,
 694                           GtkAllocation *allocation)
 695 {
 696   GList *tmp_list;
 697   GtkLayout *layout;
 698
 699   g_return_if_fail (GTK_IS_LAYOUT (widget));
 700
 701   widget->allocation = *allocation;
 702
 703   layout = GTK_LAYOUT (widget);
 704
 705   tmp_list = layout->children;
 706
 707   while (tmp_list)
 708     {
 709       GtkLayoutChild *child = tmp_list->data;
 710       tmp_list = tmp_list->next;
 711
 712       gtk_layout_allocate_child (layout, child);
 713     }
 714
 715   if (GTK_WIDGET_REALIZED (widget))
 716     {
 717       gdk_window_move_resize (widget->window,
 718                               allocation->x, allocation->y,
 719                               allocation->width, allocation->height);
 720
 721       gdk_window_resize (layout->bin_window,
 722                          MAX (layout->width, allocation->width),
 723                          MAX (layout->height, allocation->height));
 724     }
 725
 726   layout->hadjustment->page_size = allocation->width;
 727   layout->hadjustment->page_increment = allocation->width / 2;
 728   layout->hadjustment->lower = 0;
 729   layout->hadjustment->upper = MAX (allocation->width, layout->width);
 730   gtk_signal_emit_by_name (GTK_OBJECT (layout->hadjustment), "changed");
 731
 732   layout->vadjustment->page_size = allocation->height;
 733   layout->vadjustment->page_increment = allocation->height / 2;
 734   layout->vadjustment->lower = 0;
 735   layout->vadjustment->upper = MAX (allocation->height, layout->height);
 736   gtk_signal_emit_by_name (GTK_OBJECT (layout->vadjustment), "changed");
 737 }
 738
 739 static gint
 740 gtk_layout_expose (GtkWidget *widget, GdkEventExpose *event)
 741 {
 742   GtkLayout *layout;
 743
 744   g_return_val_if_fail (GTK_IS_LAYOUT (widget), FALSE);
 745
 746   layout = GTK_LAYOUT (widget);
 747
 748   if (event->window != layout->bin_window)
 749     return FALSE;
 750
 751   (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
 752
 753   return FALSE;
 754 }
 755
 756 /* Container method
 757  */
 758 static void
 759 gtk_layout_remove (GtkContainer *container,
 760                    GtkWidget    *widget)
 761 {
 762   GList *tmp_list;
 763   GtkLayout *layout;
 764   GtkLayoutChild *child = NULL;
 765
 766   g_return_if_fail (GTK_IS_LAYOUT (container));
 767
 768   layout = GTK_LAYOUT (container);
 769
 770   tmp_list = layout->children;
 771   while (tmp_list)
 772     {
 773       child = tmp_list->data;
 774       if (child->widget == widget)
 775         break;
 776       tmp_list = tmp_list->next;
 777     }
 778
 779   if (tmp_list)
 780     {
 781       gtk_widget_unparent (widget);
 782
 783       layout->children = g_list_remove_link (layout->children, tmp_list);
 784       g_list_free_1 (tmp_list);
 785       g_free (child);
 786     }
 787 }
 788
 789 static void
 790 gtk_layout_forall (GtkContainer *container,
 791                    gboolean      include_internals,
 792                    GtkCallback   callback,
 793                    gpointer      callback_data)
 794 {
 795   GtkLayout *layout;
 796   GtkLayoutChild *child;
 797   GList *tmp_list;
 798
 799   g_return_if_fail (GTK_IS_LAYOUT (container));
 800   g_return_if_fail (callback != NULL);
 801
 802   layout = GTK_LAYOUT (container);
 803
 804   tmp_list = layout->children;
 805   while (tmp_list)
 806     {
 807       child = tmp_list->data;
 808       tmp_list = tmp_list->next;
 809
 810       (* callback) (child->widget, callback_data);
 811     }
 812 }
 813
 814 /* Operations on children
 815  */
 816
 817 static void
 818 gtk_layout_allocate_child (GtkLayout      *layout,
 819                            GtkLayoutChild *child)
 820 {
 821   GtkAllocation allocation;
 822   GtkRequisition requisition;
 823
 824   allocation.x = child->x;
 825   allocation.y = child->y;
 826   gtk_widget_get_child_requisition (child->widget, &requisition);
 827   allocation.width = requisition.width;
 828   allocation.height = requisition.height;
 829
 830   gtk_widget_size_allocate (child->widget, &allocation);
 831 }
 832
 833 /* Callbacks */
 834
 835 static void
 836 gtk_layout_adjustment_changed (GtkAdjustment *adjustment,
 837                                GtkLayout     *layout)
 838 {
 839   GtkWidget *widget;
 840
 841   widget = GTK_WIDGET (layout);
 842
 843   if (layout->freeze_count)
 844     return;
 845
 846   if (GTK_WIDGET_REALIZED (layout))
 847     {
 848       gdk_window_move (layout->bin_window,
 849                        - layout->hadjustment->value,
 850                        - layout->vadjustment->value);
 851
 852       gdk_window_process_updates (layout->bin_window, TRUE);
 853     }
 854 }