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 "gtkprivate.h"
  35 #include "gtkintl.h"
  36 #include "gtkmarshalers.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 enum {
  55   CHILD_PROP_0,
  56   CHILD_PROP_X,
  57   CHILD_PROP_Y
  58 };
  59
  60 static void gtk_layout_class_init         (GtkLayoutClass *class);
  61 static void gtk_layout_get_property       (GObject        *object,
  62                                            guint           prop_id,
  63                                            GValue         *value,
  64                                            GParamSpec     *pspec);
  65 static void gtk_layout_set_property       (GObject        *object,
  66                                            guint           prop_id,
  67                                            const GValue   *value,
  68                                            GParamSpec     *pspec);
  69 static GObject *gtk_layout_constructor    (GType                  type,
  70                                            guint                  n_properties,
  71                                            GObjectConstructParam *properties);
  72 static void gtk_layout_init               (GtkLayout      *layout);
  73 static void gtk_layout_finalize           (GObject        *object);
  74 static void gtk_layout_realize            (GtkWidget      *widget);
  75 static void gtk_layout_unrealize          (GtkWidget      *widget);
  76 static void gtk_layout_map                (GtkWidget      *widget);
  77 static void gtk_layout_size_request       (GtkWidget      *widget,
  78                                            GtkRequisition *requisition);
  79 static void gtk_layout_size_allocate      (GtkWidget      *widget,
  80                                            GtkAllocation  *allocation);
  81 static gint gtk_layout_expose             (GtkWidget      *widget,
  82                                            GdkEventExpose *event);
  83 static void gtk_layout_remove             (GtkContainer   *container,
  84                                            GtkWidget      *widget);
  85 static void gtk_layout_forall             (GtkContainer   *container,
  86                                            gboolean        include_internals,
  87                                            GtkCallback     callback,
  88                                            gpointer        callback_data);
  89 static void gtk_layout_set_adjustments    (GtkLayout      *layout,
  90                                            GtkAdjustment  *hadj,
  91                                            GtkAdjustment  *vadj);
  92 static void gtk_layout_set_child_property (GtkContainer   *container,
  93                                            GtkWidget      *child,
  94                                            guint           property_id,
  95                                            const GValue   *value,
  96                                            GParamSpec     *pspec);
  97 static void gtk_layout_get_child_property (GtkContainer   *container,
  98                                            GtkWidget      *child,
  99                                            guint           property_id,
 100                                            GValue         *value,
 101                                            GParamSpec     *pspec);
 102 static void gtk_layout_allocate_child     (GtkLayout      *layout,
 103                                            GtkLayoutChild *child);
 104 static void gtk_layout_adjustment_changed (GtkAdjustment  *adjustment,
 105                                            GtkLayout      *layout);
 106 static void gtk_layout_style_set          (GtkWidget      *widget,
 107                                            GtkStyle       *old_style);
 108
 109 static void gtk_layout_set_adjustment_upper (GtkAdjustment *adj,
 110                                              gdouble        upper,
 111                                              gboolean       always_emit_changed);
 112
 113 static GtkWidgetClass *parent_class = NULL;
 114
 115 /* Public interface
 116  */
 117 /**
 118  * gtk_layout_new:
 119  * @hadjustment: horizontal scroll adjustment, or %NULL
 120  * @vadjustment: vertical scroll adjustment, or %NULL
 121  *
 122  * Creates a new #GtkLayout. Unless you have a specific adjustment
 123  * you'd like the layout to use for scrolling, pass %NULL for
 124  * @hadjustment and @vadjustment.
 125  *
 126  * Return value: a new #GtkLayout
 127  **/
 128
 129 GtkWidget*
 130 gtk_layout_new (GtkAdjustment *hadjustment,
 131                 GtkAdjustment *vadjustment)
 132 {
 133   GtkLayout *layout;
 134
 135   layout = g_object_new (GTK_TYPE_LAYOUT,
 136                          "hadjustment", hadjustment,
 137                          "vadjustment", vadjustment,
 138                          NULL);
 139
 140   return GTK_WIDGET (layout);
 141 }
 142
 143 /**
 144  * gtk_layout_get_hadjustment:
 145  * @layout: a #GtkLayout
 146  *
 147  * This function should only be called after the layout has been
 148  * placed in a #GtkScrolledWindow or otherwise configured for
 149  * scrolling. It returns the #GtkAdjustment used for communication
 150  * between the horizontal scrollbar and @layout.
 151  *
 152  * See #GtkScrolledWindow, #GtkScrollbar, #GtkAdjustment for details.
 153  *
 154  * Return value: horizontal scroll adjustment
 155  **/
 156 GtkAdjustment*
 157 gtk_layout_get_hadjustment (GtkLayout     *layout)
 158 {
 159   g_return_val_if_fail (GTK_IS_LAYOUT (layout), NULL);
 160
 161   return layout->hadjustment;
 162 }
 163 /**
 164  * gtk_layout_get_vadjustment:
 165  * @layout: a #GtkLayout
 166  *
 167  * This function should only be called after the layout has been
 168  * placed in a #GtkScrolledWindow or otherwise configured for
 169  * scrolling. It returns the #GtkAdjustment used for communication
 170  * between the vertical scrollbar and @layout.
 171  *
 172  * See #GtkScrolledWindow, #GtkScrollbar, #GtkAdjustment for details.
 173  *
 174  * Return value: vertical scroll adjustment
 175  **/
 176 GtkAdjustment*
 177 gtk_layout_get_vadjustment (GtkLayout     *layout)
 178 {
 179   g_return_val_if_fail (GTK_IS_LAYOUT (layout), NULL);
 180
 181   return layout->vadjustment;
 182 }
 183
 184 static GtkAdjustment *
 185 new_default_adjustment (void)
 186 {
 187   return GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
 188 }
 189
 190 static void
 191 gtk_layout_set_adjustments (GtkLayout     *layout,
 192                             GtkAdjustment *hadj,
 193                             GtkAdjustment *vadj)
 194 {
 195   gboolean need_adjust = FALSE;
 196
 197   g_return_if_fail (GTK_IS_LAYOUT (layout));
 198
 199   if (hadj)
 200     g_return_if_fail (GTK_IS_ADJUSTMENT (hadj));
 201   else if (layout->hadjustment)
 202     hadj = new_default_adjustment ();
 203   if (vadj)
 204     g_return_if_fail (GTK_IS_ADJUSTMENT (vadj));
 205   else if (layout->vadjustment)
 206     vadj = new_default_adjustment ();
 207
 208   if (layout->hadjustment && (layout->hadjustment != hadj))
 209     {
 210       g_signal_handlers_disconnect_by_func (layout->hadjustment,
 211                                             gtk_layout_adjustment_changed,
 212                                             layout);
 213       g_object_unref (layout->hadjustment);
 214     }
 215
 216   if (layout->vadjustment && (layout->vadjustment != vadj))
 217     {
 218       g_signal_handlers_disconnect_by_func (layout->vadjustment,
 219                                             gtk_layout_adjustment_changed,
 220                                             layout);
 221       g_object_unref (layout->vadjustment);
 222     }
 223
 224   if (layout->hadjustment != hadj)
 225     {
 226       layout->hadjustment = hadj;
 227       g_object_ref (layout->hadjustment);
 228       gtk_object_sink (GTK_OBJECT (layout->hadjustment));
 229       gtk_layout_set_adjustment_upper (layout->hadjustment, layout->width, FALSE);
 230
 231       g_signal_connect (layout->hadjustment, "value_changed",
 232                         G_CALLBACK (gtk_layout_adjustment_changed),
 233                         layout);
 234       need_adjust = TRUE;
 235     }
 236
 237   if (layout->vadjustment != vadj)
 238     {
 239       layout->vadjustment = vadj;
 240       g_object_ref (layout->vadjustment);
 241       gtk_object_sink (GTK_OBJECT (layout->vadjustment));
 242       gtk_layout_set_adjustment_upper (layout->vadjustment, layout->height, FALSE);
 243
 244       g_signal_connect (layout->vadjustment, "value_changed",
 245                         G_CALLBACK (gtk_layout_adjustment_changed),
 246                         layout);
 247       need_adjust = TRUE;
 248     }
 249
 250   /* vadj or hadj can be NULL while constructing; don't emit a signal
 251      then */
 252   if (need_adjust && vadj && hadj)
 253     gtk_layout_adjustment_changed (NULL, layout);
 254 }
 255
 256 static void
 257 gtk_layout_finalize (GObject *object)
 258 {
 259   GtkLayout *layout = GTK_LAYOUT (object);
 260
 261   g_object_unref (layout->hadjustment);
 262   g_object_unref (layout->vadjustment);
 263
 264   G_OBJECT_CLASS (parent_class)->finalize (object);
 265 }
 266
 267 /**
 268  * gtk_layout_set_hadjustment:
 269  * @layout: a #GtkLayout
 270  * @adjustment: new scroll adjustment
 271  *
 272  * Sets the horizontal scroll adjustment for the layout.
 273  *
 274  * See #GtkScrolledWindow, #GtkScrollbar, #GtkAdjustment for details.
 275  *
 276  **/
 277 void
 278 gtk_layout_set_hadjustment (GtkLayout     *layout,
 279                             GtkAdjustment *adjustment)
 280 {
 281   g_return_if_fail (GTK_IS_LAYOUT (layout));
 282
 283   gtk_layout_set_adjustments (layout, adjustment, layout->vadjustment);
 284   g_object_notify (G_OBJECT (layout), "hadjustment");
 285 }
 286
 287 /**
 288  * gtk_layout_set_vadjustment:
 289  * @layout: a #GtkLayout
 290  * @adjustment: new scroll adjustment
 291  *
 292  * Sets the vertical scroll adjustment for the layout.
 293  *
 294  * See #GtkScrolledWindow, #GtkScrollbar, #GtkAdjustment for details.
 295  *
 296  **/
 297 void
 298 gtk_layout_set_vadjustment (GtkLayout     *layout,
 299                             GtkAdjustment *adjustment)
 300 {
 301   g_return_if_fail (GTK_IS_LAYOUT (layout));
 302
 303   gtk_layout_set_adjustments (layout, layout->hadjustment, adjustment);
 304   g_object_notify (G_OBJECT (layout), "vadjustment");
 305 }
 306
 307 static GtkLayoutChild*
 308 get_child (GtkLayout  *layout,
 309            GtkWidget  *widget)
 310 {
 311   GList *children;
 312
 313   children = layout->children;
 314   while (children)
 315     {
 316       GtkLayoutChild *child;
 317
 318       child = children->data;
 319       children = children->next;
 320
 321       if (child->widget == widget)
 322         return child;
 323     }
 324
 325   return NULL;
 326 }
 327
 328 /**
 329  * gtk_layout_put:
 330  * @layout: a #GtkLayout
 331  * @child_widget: child widget
 332  * @x: X position of child widget
 333  * @y: Y position of child widget
 334  *
 335  * Adds @child_widget to @layout, at position (@x,@y).
 336  * @layout becomes the new parent container of @child_widget.
 337  *
 338  **/
 339 void
 340 gtk_layout_put (GtkLayout     *layout,
 341                 GtkWidget     *child_widget,
 342                 gint           x,
 343                 gint           y)
 344 {
 345   GtkLayoutChild *child;
 346
 347   g_return_if_fail (GTK_IS_LAYOUT (layout));
 348   g_return_if_fail (GTK_IS_WIDGET (child_widget));
 349
 350   child = g_new (GtkLayoutChild, 1);
 351
 352   child->widget = child_widget;
 353   child->x = x;
 354   child->y = y;
 355
 356   layout->children = g_list_append (layout->children, child);
 357
 358   if (GTK_WIDGET_REALIZED (layout))
 359     gtk_widget_set_parent_window (child->widget, layout->bin_window);
 360
 361   gtk_widget_set_parent (child_widget, GTK_WIDGET (layout));
 362 }
 363
 364 static void
 365 gtk_layout_move_internal (GtkLayout       *layout,
 366                           GtkWidget       *widget,
 367                           gboolean         change_x,
 368                           gint             x,
 369                           gboolean         change_y,
 370                           gint             y)
 371 {
 372   GtkLayoutChild *child;
 373
 374   g_return_if_fail (GTK_IS_LAYOUT (layout));
 375   g_return_if_fail (GTK_IS_WIDGET (widget));
 376   g_return_if_fail (widget->parent == GTK_WIDGET (layout));
 377
 378   child = get_child (layout, widget);
 379
 380   g_assert (child);
 381
 382   gtk_widget_freeze_child_notify (widget);
 383
 384   if (change_x)
 385     {
 386       child->x = x;
 387       gtk_widget_child_notify (widget, "x");
 388     }
 389
 390   if (change_y)
 391     {
 392       child->y = y;
 393       gtk_widget_child_notify (widget, "y");
 394     }
 395
 396   gtk_widget_thaw_child_notify (widget);
 397
 398   if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (layout))
 399     gtk_widget_queue_resize (GTK_WIDGET (widget));
 400 }
 401
 402 /**
 403  * gtk_layout_move:
 404  * @layout: a #GtkLayout
 405  * @child_widget: a current child of @layout
 406  * @x: X position to move to
 407  * @y: Y position to move to
 408  *
 409  * Moves a current child of @layout to a new position.
 410  *
 411  **/
 412 void
 413 gtk_layout_move (GtkLayout     *layout,
 414                  GtkWidget     *child_widget,
 415                  gint           x,
 416                  gint           y)
 417 {
 418   g_return_if_fail (GTK_IS_LAYOUT (layout));
 419   g_return_if_fail (GTK_IS_WIDGET (child_widget));
 420   g_return_if_fail (child_widget->parent == GTK_WIDGET (layout));
 421
 422   gtk_layout_move_internal (layout, child_widget, TRUE, x, TRUE, y);
 423 }
 424
 425 static void
 426 gtk_layout_set_adjustment_upper (GtkAdjustment *adj,
 427                                  gdouble        upper,
 428                                  gboolean       always_emit_changed)
 429 {
 430   gboolean changed = FALSE;
 431   gboolean value_changed = FALSE;
 432
 433   gdouble min = MAX (0., upper - adj->page_size);
 434
 435   if (upper != adj->upper)
 436     {
 437       adj->upper = upper;
 438       changed = TRUE;
 439     }
 440
 441   if (adj->value > min)
 442     {
 443       adj->value = min;
 444       value_changed = TRUE;
 445     }
 446
 447   if (changed || always_emit_changed)
 448     gtk_adjustment_changed (adj);
 449   if (value_changed)
 450     gtk_adjustment_value_changed (adj);
 451 }
 452
 453 /**
 454  * gtk_layout_set_size:
 455  * @layout: a #GtkLayout
 456  * @width: width of entire scrollable area
 457  * @height: height of entire scrollable area
 458  *
 459  * Sets the size of the scrollable area of the layout.
 460  *
 461  **/
 462 void
 463 gtk_layout_set_size (GtkLayout     *layout,
 464                      guint          width,
 465                      guint          height)
 466 {
 467   GtkWidget *widget;
 468
 469   g_return_if_fail (GTK_IS_LAYOUT (layout));
 470
 471   widget = GTK_WIDGET (layout);
 472
 473   g_object_freeze_notify (G_OBJECT (layout));
 474   if (width != layout->width)
 475      {
 476         layout->width = width;
 477         g_object_notify (G_OBJECT (layout), "width");
 478      }
 479   if (height != layout->height)
 480      {
 481         layout->height = height;
 482         g_object_notify (G_OBJECT (layout), "height");
 483      }
 484   g_object_thaw_notify (G_OBJECT (layout));
 485
 486   if (layout->hadjustment)
 487     gtk_layout_set_adjustment_upper (layout->hadjustment, layout->width, FALSE);
 488   if (layout->vadjustment)
 489     gtk_layout_set_adjustment_upper (layout->vadjustment, layout->height, FALSE);
 490
 491   if (GTK_WIDGET_REALIZED (layout))
 492     {
 493       width = MAX (width, widget->allocation.width);
 494       height = MAX (height, widget->allocation.height);
 495       gdk_window_resize (layout->bin_window, width, height);
 496     }
 497 }
 498
 499 /**
 500  * gtk_layout_get_size:
 501  * @layout: a #GtkLayout
 502  * @width: location to store the width set on @layout, or %NULL
 503  * @height: location to store the height set on @layout, or %NULL
 504  *
 505  * Gets the size that has been set on the layout, and that determines
 506  * the total extents of the layout's scrollbar area. See
 507  * gtk_layout_set_size ().
 508  **/
 509 void
 510 gtk_layout_get_size (GtkLayout *layout,
 511                      guint     *width,
 512                      guint     *height)
 513 {
 514   g_return_if_fail (GTK_IS_LAYOUT (layout));
 515
 516   if (width)
 517     *width = layout->width;
 518   if (height)
 519     *height = layout->height;
 520 }
 521
 522 /**
 523  * gtk_layout_freeze:
 524  * @layout: a #GtkLayout
 525  *
 526  * This is a deprecated function, it doesn't do anything useful.
 527  **/
 528 void
 529 gtk_layout_freeze (GtkLayout *layout)
 530 {
 531   g_return_if_fail (GTK_IS_LAYOUT (layout));
 532
 533   layout->freeze_count++;
 534 }
 535
 536 /**
 537  * gtk_layout_thaw:
 538  * @layout: a #GtkLayout
 539  *
 540  * This is a deprecated function, it doesn't do anything useful.
 541  **/
 542 void
 543 gtk_layout_thaw (GtkLayout *layout)
 544 {
 545   g_return_if_fail (GTK_IS_LAYOUT (layout));
 546
 547   if (layout->freeze_count)
 548     {
 549       if (!(--layout->freeze_count))
 550         {
 551           gtk_widget_queue_draw (GTK_WIDGET (layout));
 552           gdk_window_process_updates (GTK_WIDGET (layout)->window, TRUE);
 553         }
 554     }
 555
 556 }
 557
 558 /* Basic Object handling procedures
 559  */
 560 GType
 561 gtk_layout_get_type (void)
 562 {
 563   static GType layout_type = 0;
 564
 565   if (!layout_type)
 566     {
 567       static const GTypeInfo layout_info =
 568       {
 569         sizeof (GtkLayoutClass),
 570         NULL,           /* base_init */
 571         NULL,           /* base_finalize */
 572         (GClassInitFunc) gtk_layout_class_init,
 573         NULL,           /* class_finalize */
 574         NULL,           /* class_data */
 575         sizeof (GtkLayout),
 576         0,              /* n_preallocs */
 577         (GInstanceInitFunc) gtk_layout_init,
 578       };
 579
 580       layout_type = g_type_register_static (GTK_TYPE_CONTAINER, "GtkLayout",
 581                                             &layout_info, 0);
 582     }
 583
 584   return layout_type;
 585 }
 586
 587 static void
 588 gtk_layout_class_init (GtkLayoutClass *class)
 589 {
 590   GObjectClass *gobject_class;
 591   GtkWidgetClass *widget_class;
 592   GtkContainerClass *container_class;
 593
 594   gobject_class = (GObjectClass*) class;
 595   widget_class = (GtkWidgetClass*) class;
 596   container_class = (GtkContainerClass*) class;
 597
 598   parent_class = g_type_class_peek_parent (class);
 599
 600   gobject_class->set_property = gtk_layout_set_property;
 601   gobject_class->get_property = gtk_layout_get_property;
 602   gobject_class->finalize = gtk_layout_finalize;
 603   gobject_class->constructor = gtk_layout_constructor;
 604
 605   container_class->set_child_property = gtk_layout_set_child_property;
 606   container_class->get_child_property = gtk_layout_get_child_property;
 607
 608   gtk_container_class_install_child_property (container_class,
 609                                               CHILD_PROP_X,
 610                                               g_param_spec_int ("x",
 611                                                                 _("X position"),
 612                                                                 _("X position of child widget"),
 613                                                                 G_MININT,
 614                                                                 G_MAXINT,
 615                                                                 0,
 616                                                                 G_PARAM_READWRITE));
 617
 618   gtk_container_class_install_child_property (container_class,
 619                                               CHILD_PROP_Y,
 620                                               g_param_spec_int ("y",
 621                                                                 _("Y position"),
 622                                                                 _("Y position of child widget"),
 623                                                                 G_MININT,
 624                                                                 G_MAXINT,
 625                                                                 0,
 626                                                                 G_PARAM_READWRITE));
 627
 628   g_object_class_install_property (gobject_class,
 629                                    PROP_HADJUSTMENT,
 630                                    g_param_spec_object ("hadjustment",
 631                                                         _("Horizontal adjustment"),
 632                                                         _("The GtkAdjustment for the horizontal position"),
 633                                                         GTK_TYPE_ADJUSTMENT,
 634                                                         G_PARAM_READWRITE));
 635
 636   g_object_class_install_property (gobject_class,
 637                                    PROP_VADJUSTMENT,
 638                                    g_param_spec_object ("vadjustment",
 639                                                         _("Vertical adjustment"),
 640                                                         _("The GtkAdjustment for the vertical position"),
 641                                                         GTK_TYPE_ADJUSTMENT,
 642                                                         G_PARAM_READWRITE));
 643
 644   g_object_class_install_property (gobject_class,
 645                                    PROP_WIDTH,
 646                                    g_param_spec_uint ("width",
 647                                                      _("Width"),
 648                                                      _("The width of the layout"),
 649                                                      0,
 650                                                      G_MAXINT,
 651                                                      100,
 652                                                      G_PARAM_READWRITE));
 653   g_object_class_install_property (gobject_class,
 654                                    PROP_HEIGHT,
 655                                    g_param_spec_uint ("height",
 656                                                      _("Height"),
 657                                                      _("The height of the layout"),
 658                                                      0,
 659                                                      G_MAXINT,
 660                                                      100,
 661                                                      G_PARAM_READWRITE));
 662   widget_class->realize = gtk_layout_realize;
 663   widget_class->unrealize = gtk_layout_unrealize;
 664   widget_class->map = gtk_layout_map;
 665   widget_class->size_request = gtk_layout_size_request;
 666   widget_class->size_allocate = gtk_layout_size_allocate;
 667   widget_class->expose_event = gtk_layout_expose;
 668   widget_class->style_set = gtk_layout_style_set;
 669
 670   container_class->remove = gtk_layout_remove;
 671   container_class->forall = gtk_layout_forall;
 672
 673   class->set_scroll_adjustments = gtk_layout_set_adjustments;
 674
 675   widget_class->set_scroll_adjustments_signal =
 676     g_signal_new ("set_scroll_adjustments",
 677                   G_OBJECT_CLASS_TYPE (gobject_class),
 678                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 679                   G_STRUCT_OFFSET (GtkLayoutClass, set_scroll_adjustments),
 680                   NULL, NULL,
 681                   _gtk_marshal_VOID__OBJECT_OBJECT,
 682                   G_TYPE_NONE, 2,
 683                   GTK_TYPE_ADJUSTMENT,
 684                   GTK_TYPE_ADJUSTMENT);
 685 }
 686
 687 static void
 688 gtk_layout_get_property (GObject     *object,
 689                          guint        prop_id,
 690                          GValue      *value,
 691                          GParamSpec  *pspec)
 692 {
 693   GtkLayout *layout = GTK_LAYOUT (object);
 694
 695   switch (prop_id)
 696     {
 697     case PROP_HADJUSTMENT:
 698       g_value_set_object (value, layout->hadjustment);
 699       break;
 700     case PROP_VADJUSTMENT:
 701       g_value_set_object (value, layout->vadjustment);
 702       break;
 703     case PROP_WIDTH:
 704       g_value_set_uint (value, layout->width);
 705       break;
 706     case PROP_HEIGHT:
 707       g_value_set_uint (value, layout->height);
 708       break;
 709     default:
 710       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 711       break;
 712     }
 713 }
 714
 715 static void
 716 gtk_layout_set_property (GObject      *object,
 717                          guint         prop_id,
 718                          const GValue *value,
 719                          GParamSpec   *pspec)
 720 {
 721   GtkLayout *layout = GTK_LAYOUT (object);
 722
 723   switch (prop_id)
 724     {
 725     case PROP_HADJUSTMENT:
 726       gtk_layout_set_hadjustment (layout,
 727                                   (GtkAdjustment*) g_value_get_object (value));
 728       break;
 729     case PROP_VADJUSTMENT:
 730       gtk_layout_set_vadjustment (layout,
 731                                   (GtkAdjustment*) g_value_get_object (value));
 732       break;
 733     case PROP_WIDTH:
 734       gtk_layout_set_size (layout, g_value_get_uint (value),
 735                            layout->height);
 736       break;
 737     case PROP_HEIGHT:
 738       gtk_layout_set_size (layout, layout->width,
 739                            g_value_get_uint (value));
 740       break;
 741     default:
 742       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 743       break;
 744     }
 745 }
 746
 747 static void
 748 gtk_layout_set_child_property (GtkContainer    *container,
 749                                GtkWidget       *child,
 750                                guint            property_id,
 751                                const GValue    *value,
 752                                GParamSpec      *pspec)
 753 {
 754   switch (property_id)
 755     {
 756     case CHILD_PROP_X:
 757       gtk_layout_move_internal (GTK_LAYOUT (container),
 758                                 child,
 759                                 TRUE, g_value_get_int (value),
 760                                 FALSE, 0);
 761       break;
 762     case CHILD_PROP_Y:
 763       gtk_layout_move_internal (GTK_LAYOUT (container),
 764                                 child,
 765                                 FALSE, 0,
 766                                 TRUE, g_value_get_int (value));
 767       break;
 768     default:
 769       GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
 770       break;
 771     }
 772 }
 773
 774 static void
 775 gtk_layout_get_child_property (GtkContainer *container,
 776                                GtkWidget    *child,
 777                                guint         property_id,
 778                                GValue       *value,
 779                                GParamSpec   *pspec)
 780 {
 781   GtkLayoutChild *layout_child;
 782
 783   layout_child = get_child (GTK_LAYOUT (container), child);
 784
 785   switch (property_id)
 786     {
 787     case CHILD_PROP_X:
 788       g_value_set_int (value, layout_child->x);
 789       break;
 790     case CHILD_PROP_Y:
 791       g_value_set_int (value, layout_child->y);
 792       break;
 793     default:
 794       GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
 795       break;
 796     }
 797 }
 798
 799 static void
 800 gtk_layout_init (GtkLayout *layout)
 801 {
 802   layout->children = NULL;
 803
 804   layout->width = 100;
 805   layout->height = 100;
 806
 807   layout->hadjustment = NULL;
 808   layout->vadjustment = NULL;
 809
 810   layout->bin_window = NULL;
 811
 812   layout->scroll_x = 0;
 813   layout->scroll_y = 0;
 814   layout->visibility = GDK_VISIBILITY_PARTIAL;
 815
 816   layout->freeze_count = 0;
 817 }
 818
 819 static GObject *
 820 gtk_layout_constructor (GType                  type,
 821                         guint                  n_properties,
 822                         GObjectConstructParam *properties)
 823 {
 824   GtkLayout *layout;
 825   GObject *object;
 826   GtkAdjustment *hadj, *vadj;
 827
 828   object = G_OBJECT_CLASS (parent_class)->constructor (type,
 829                                                        n_properties,
 830                                                        properties);
 831
 832   layout = GTK_LAYOUT (object);
 833
 834   hadj = layout->hadjustment ? layout->hadjustment : new_default_adjustment ();
 835   vadj = layout->vadjustment ? layout->vadjustment : new_default_adjustment ();
 836
 837   if (!layout->hadjustment || !layout->vadjustment)
 838     gtk_layout_set_adjustments (layout, hadj, vadj);
 839
 840   return object;
 841 }
 842
 843 /* Widget methods
 844  */
 845
 846 static void
 847 gtk_layout_realize (GtkWidget *widget)
 848 {
 849   GList *tmp_list;
 850   GtkLayout *layout;
 851   GdkWindowAttr attributes;
 852   gint attributes_mask;
 853
 854   g_return_if_fail (GTK_IS_LAYOUT (widget));
 855
 856   layout = GTK_LAYOUT (widget);
 857   GTK_WIDGET_SET_FLAGS (layout, GTK_REALIZED);
 858
 859   attributes.window_type = GDK_WINDOW_CHILD;
 860   attributes.x = widget->allocation.x;
 861   attributes.y = widget->allocation.y;
 862   attributes.width = widget->allocation.width;
 863   attributes.height = widget->allocation.height;
 864   attributes.wclass = GDK_INPUT_OUTPUT;
 865   attributes.visual = gtk_widget_get_visual (widget);
 866   attributes.colormap = gtk_widget_get_colormap (widget);
 867   attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;
 868
 869   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 870
 871   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 872                                    &attributes, attributes_mask);
 873   gdk_window_set_user_data (widget->window, widget);
 874
 875   attributes.x = - layout->hadjustment->value,
 876   attributes.y = - layout->vadjustment->value;
 877   attributes.width = MAX (layout->width, widget->allocation.width);
 878   attributes.height = MAX (layout->height, widget->allocation.height);
 879   attributes.event_mask = GDK_EXPOSURE_MASK | GDK_SCROLL_MASK |
 880                           gtk_widget_get_events (widget);
 881
 882   layout->bin_window = gdk_window_new (widget->window,
 883                                         &attributes, attributes_mask);
 884   gdk_window_set_user_data (layout->bin_window, widget);
 885
 886   widget->style = gtk_style_attach (widget->style, widget->window);
 887   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 888   gtk_style_set_background (widget->style, layout->bin_window, GTK_STATE_NORMAL);
 889
 890   tmp_list = layout->children;
 891   while (tmp_list)
 892     {
 893       GtkLayoutChild *child = tmp_list->data;
 894       tmp_list = tmp_list->next;
 895
 896       gtk_widget_set_parent_window (child->widget, layout->bin_window);
 897     }
 898 }
 899
 900 static void
 901 gtk_layout_style_set (GtkWidget *widget, GtkStyle *old_style)
 902 {
 903   if (GTK_WIDGET_CLASS (parent_class)->style_set)
 904     (* GTK_WIDGET_CLASS (parent_class)->style_set) (widget, old_style);
 905
 906   if (GTK_WIDGET_REALIZED (widget))
 907     {
 908       gtk_style_set_background (widget->style, GTK_LAYOUT (widget)->bin_window, GTK_STATE_NORMAL);
 909     }
 910 }
 911
 912 static void
 913 gtk_layout_map (GtkWidget *widget)
 914 {
 915   GList *tmp_list;
 916   GtkLayout *layout;
 917
 918   g_return_if_fail (GTK_IS_LAYOUT (widget));
 919
 920   layout = GTK_LAYOUT (widget);
 921
 922   GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 923
 924   tmp_list = layout->children;
 925   while (tmp_list)
 926     {
 927       GtkLayoutChild *child = tmp_list->data;
 928       tmp_list = tmp_list->next;
 929
 930       if (GTK_WIDGET_VISIBLE (child->widget))
 931         {
 932           if (!GTK_WIDGET_MAPPED (child->widget))
 933             gtk_widget_map (child->widget);
 934         }
 935     }
 936
 937   gdk_window_show (layout->bin_window);
 938   gdk_window_show (widget->window);
 939 }
 940
 941 static void
 942 gtk_layout_unrealize (GtkWidget *widget)
 943 {
 944   GtkLayout *layout;
 945
 946   g_return_if_fail (GTK_IS_LAYOUT (widget));
 947
 948   layout = GTK_LAYOUT (widget);
 949
 950   gdk_window_set_user_data (layout->bin_window, NULL);
 951   gdk_window_destroy (layout->bin_window);
 952   layout->bin_window = NULL;
 953
 954   if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 955     (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 956 }
 957
 958 static void
 959 gtk_layout_size_request (GtkWidget     *widget,
 960                          GtkRequisition *requisition)
 961 {
 962   GList *tmp_list;
 963   GtkLayout *layout;
 964
 965   g_return_if_fail (GTK_IS_LAYOUT (widget));
 966
 967   layout = GTK_LAYOUT (widget);
 968
 969   requisition->width = 0;
 970   requisition->height = 0;
 971
 972   tmp_list = layout->children;
 973
 974   while (tmp_list)
 975     {
 976       GtkLayoutChild *child = tmp_list->data;
 977       GtkRequisition child_requisition;
 978
 979       tmp_list = tmp_list->next;
 980
 981       gtk_widget_size_request (child->widget, &child_requisition);
 982     }
 983 }
 984
 985 static void
 986 gtk_layout_size_allocate (GtkWidget     *widget,
 987                           GtkAllocation *allocation)
 988 {
 989   GList *tmp_list;
 990   GtkLayout *layout;
 991
 992   g_return_if_fail (GTK_IS_LAYOUT (widget));
 993
 994   widget->allocation = *allocation;
 995
 996   layout = GTK_LAYOUT (widget);
 997
 998   tmp_list = layout->children;
 999
1000   while (tmp_list)
1001     {
1002       GtkLayoutChild *child = tmp_list->data;
1003       tmp_list = tmp_list->next;
1004
1005       gtk_layout_allocate_child (layout, child);
1006     }
1007
1008   if (GTK_WIDGET_REALIZED (widget))
1009     {
1010       gdk_window_move_resize (widget->window,
1011                               allocation->x, allocation->y,
1012                               allocation->width, allocation->height);
1013
1014       gdk_window_resize (layout->bin_window,
1015                          MAX (layout->width, allocation->width),
1016                          MAX (layout->height, allocation->height));
1017     }
1018
1019   layout->hadjustment->page_size = allocation->width;
1020   layout->hadjustment->page_increment = allocation->width * 0.9;
1021   layout->hadjustment->lower = 0;
1022   /* set_adjustment_upper() emits ::changed */
1023   gtk_layout_set_adjustment_upper (layout->hadjustment, MAX (allocation->width, layout->width), TRUE);
1024
1025   layout->vadjustment->page_size = allocation->height;
1026   layout->vadjustment->page_increment = allocation->height * 0.9;
1027   layout->vadjustment->lower = 0;
1028   layout->vadjustment->upper = MAX (allocation->height, layout->height);
1029   gtk_layout_set_adjustment_upper (layout->vadjustment, MAX (allocation->height, layout->height), TRUE);
1030 }
1031
1032 static gint
1033 gtk_layout_expose (GtkWidget *widget, GdkEventExpose *event)
1034 {
1035   GtkLayout *layout;
1036
1037   g_return_val_if_fail (GTK_IS_LAYOUT (widget), FALSE);
1038
1039   layout = GTK_LAYOUT (widget);
1040
1041   if (event->window != layout->bin_window)
1042     return FALSE;
1043
1044   (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
1045
1046   return FALSE;
1047 }
1048
1049 /* Container method
1050  */
1051 static void
1052 gtk_layout_remove (GtkContainer *container,
1053                    GtkWidget    *widget)
1054 {
1055   GList *tmp_list;
1056   GtkLayout *layout;
1057   GtkLayoutChild *child = NULL;
1058
1059   g_return_if_fail (GTK_IS_LAYOUT (container));
1060
1061   layout = GTK_LAYOUT (container);
1062
1063   tmp_list = layout->children;
1064   while (tmp_list)
1065     {
1066       child = tmp_list->data;
1067       if (child->widget == widget)
1068         break;
1069       tmp_list = tmp_list->next;
1070     }
1071
1072   if (tmp_list)
1073     {
1074       gtk_widget_unparent (widget);
1075
1076       layout->children = g_list_remove_link (layout->children, tmp_list);
1077       g_list_free_1 (tmp_list);
1078       g_free (child);
1079     }
1080 }
1081
1082 static void
1083 gtk_layout_forall (GtkContainer *container,
1084                    gboolean      include_internals,
1085                    GtkCallback   callback,
1086                    gpointer      callback_data)
1087 {
1088   GtkLayout *layout;
1089   GtkLayoutChild *child;
1090   GList *tmp_list;
1091
1092   g_return_if_fail (GTK_IS_LAYOUT (container));
1093   g_return_if_fail (callback != NULL);
1094
1095   layout = GTK_LAYOUT (container);
1096
1097   tmp_list = layout->children;
1098   while (tmp_list)
1099     {
1100       child = tmp_list->data;
1101       tmp_list = tmp_list->next;
1102
1103       (* callback) (child->widget, callback_data);
1104     }
1105 }
1106
1107 /* Operations on children
1108  */
1109
1110 static void
1111 gtk_layout_allocate_child (GtkLayout      *layout,
1112                            GtkLayoutChild *child)
1113 {
1114   GtkAllocation allocation;
1115   GtkRequisition requisition;
1116
1117   allocation.x = child->x;
1118   allocation.y = child->y;
1119   gtk_widget_get_child_requisition (child->widget, &requisition);
1120   allocation.width = requisition.width;
1121   allocation.height = requisition.height;
1122
1123   gtk_widget_size_allocate (child->widget, &allocation);
1124 }
1125
1126 /* Callbacks */
1127
1128 static void
1129 gtk_layout_adjustment_changed (GtkAdjustment *adjustment,
1130                                GtkLayout     *layout)
1131 {
1132   GtkWidget *widget;
1133
1134   widget = GTK_WIDGET (layout);
1135
1136   if (layout->freeze_count)
1137     return;
1138
1139   if (GTK_WIDGET_REALIZED (layout))
1140     {
1141       gdk_window_move (layout->bin_window,
1142                        - layout->hadjustment->value,
1143                        - layout->vadjustment->value);
1144
1145       gdk_window_process_updates (layout->bin_window, TRUE);
1146     }
1147 }