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 <config.h>
  32 #include "gdkconfig.h"
  33
  34 #include "gtklayout.h"
  35 #include "gtkprivate.h"
  36 #include "gtkintl.h"
  37 #include "gtkmarshalers.h"
  38
  39 typedef struct _GtkLayoutChild   GtkLayoutChild;
  40
  41 struct _GtkLayoutChild {
  42   GtkWidget *widget;
  43   gint x;
  44   gint y;
  45 };
  46
  47 enum {
  48    PROP_0,
  49    PROP_HADJUSTMENT,
  50    PROP_VADJUSTMENT,
  51    PROP_WIDTH,
  52    PROP_HEIGHT
  53 };
  54
  55 enum {
  56   CHILD_PROP_0,
  57   CHILD_PROP_X,
  58   CHILD_PROP_Y
  59 };
  60
  61 static void gtk_layout_class_init         (GtkLayoutClass *class);
  62 static void gtk_layout_get_property       (GObject        *object,
  63                                            guint           prop_id,
  64                                            GValue         *value,
  65                                            GParamSpec     *pspec);
  66 static void gtk_layout_set_property       (GObject        *object,
  67                                            guint           prop_id,
  68                                            const GValue   *value,
  69                                            GParamSpec     *pspec);
  70 static GObject *gtk_layout_constructor    (GType                  type,
  71                                            guint                  n_properties,
  72                                            GObjectConstructParam *properties);
  73 static void gtk_layout_init               (GtkLayout      *layout);
  74 static void gtk_layout_finalize           (GObject        *object);
  75 static void gtk_layout_realize            (GtkWidget      *widget);
  76 static void gtk_layout_unrealize          (GtkWidget      *widget);
  77 static void gtk_layout_map                (GtkWidget      *widget);
  78 static void gtk_layout_size_request       (GtkWidget      *widget,
  79                                            GtkRequisition *requisition);
  80 static void gtk_layout_size_allocate      (GtkWidget      *widget,
  81                                            GtkAllocation  *allocation);
  82 static gint gtk_layout_expose             (GtkWidget      *widget,
  83                                            GdkEventExpose *event);
  84 static void gtk_layout_remove             (GtkContainer   *container,
  85                                            GtkWidget      *widget);
  86 static void gtk_layout_forall             (GtkContainer   *container,
  87                                            gboolean        include_internals,
  88                                            GtkCallback     callback,
  89                                            gpointer        callback_data);
  90 static void gtk_layout_set_adjustments    (GtkLayout      *layout,
  91                                            GtkAdjustment  *hadj,
  92                                            GtkAdjustment  *vadj);
  93 static void gtk_layout_set_child_property (GtkContainer   *container,
  94                                            GtkWidget      *child,
  95                                            guint           property_id,
  96                                            const GValue   *value,
  97                                            GParamSpec     *pspec);
  98 static void gtk_layout_get_child_property (GtkContainer   *container,
  99                                            GtkWidget      *child,
 100                                            guint           property_id,
 101                                            GValue         *value,
 102                                            GParamSpec     *pspec);
 103 static void gtk_layout_allocate_child     (GtkLayout      *layout,
 104                                            GtkLayoutChild *child);
 105 static void gtk_layout_adjustment_changed (GtkAdjustment  *adjustment,
 106                                            GtkLayout      *layout);
 107 static void gtk_layout_style_set          (GtkWidget      *widget,
 108                                            GtkStyle       *old_style);
 109
 110 static void gtk_layout_set_adjustment_upper (GtkAdjustment *adj,
 111                                              gdouble        upper,
 112                                              gboolean       always_emit_changed);
 113
 114 static GtkWidgetClass *parent_class = NULL;
 115
 116 /* Public interface
 117  */
 118 /**
 119  * gtk_layout_new:
 120  * @hadjustment: horizontal scroll adjustment, or %NULL
 121  * @vadjustment: vertical scroll adjustment, or %NULL
 122  *
 123  * Creates a new #GtkLayout. Unless you have a specific adjustment
 124  * you'd like the layout to use for scrolling, pass %NULL for
 125  * @hadjustment and @vadjustment.
 126  *
 127  * Return value: a new #GtkLayout
 128  **/
 129
 130 GtkWidget*
 131 gtk_layout_new (GtkAdjustment *hadjustment,
 132                 GtkAdjustment *vadjustment)
 133 {
 134   GtkLayout *layout;
 135
 136   layout = g_object_new (GTK_TYPE_LAYOUT,
 137                          "hadjustment", hadjustment,
 138                          "vadjustment", vadjustment,
 139                          NULL);
 140
 141   return GTK_WIDGET (layout);
 142 }
 143
 144 /**
 145  * gtk_layout_get_hadjustment:
 146  * @layout: a #GtkLayout
 147  *
 148  * This function should only be called after the layout has been
 149  * placed in a #GtkScrolledWindow or otherwise configured for
 150  * scrolling. It returns the #GtkAdjustment used for communication
 151  * between the horizontal scrollbar and @layout.
 152  *
 153  * See #GtkScrolledWindow, #GtkScrollbar, #GtkAdjustment for details.
 154  *
 155  * Return value: horizontal scroll adjustment
 156  **/
 157 GtkAdjustment*
 158 gtk_layout_get_hadjustment (GtkLayout     *layout)
 159 {
 160   g_return_val_if_fail (GTK_IS_LAYOUT (layout), NULL);
 161
 162   return layout->hadjustment;
 163 }
 164 /**
 165  * gtk_layout_get_vadjustment:
 166  * @layout: a #GtkLayout
 167  *
 168  * This function should only be called after the layout has been
 169  * placed in a #GtkScrolledWindow or otherwise configured for
 170  * scrolling. It returns the #GtkAdjustment used for communication
 171  * between the vertical scrollbar and @layout.
 172  *
 173  * See #GtkScrolledWindow, #GtkScrollbar, #GtkAdjustment for details.
 174  *
 175  * Return value: vertical scroll adjustment
 176  **/
 177 GtkAdjustment*
 178 gtk_layout_get_vadjustment (GtkLayout     *layout)
 179 {
 180   g_return_val_if_fail (GTK_IS_LAYOUT (layout), NULL);
 181
 182   return layout->vadjustment;
 183 }
 184
 185 static GtkAdjustment *
 186 new_default_adjustment (void)
 187 {
 188   return GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
 189 }
 190
 191 static void
 192 gtk_layout_set_adjustments (GtkLayout     *layout,
 193                             GtkAdjustment *hadj,
 194                             GtkAdjustment *vadj)
 195 {
 196   gboolean need_adjust = FALSE;
 197
 198   g_return_if_fail (GTK_IS_LAYOUT (layout));
 199
 200   if (hadj)
 201     g_return_if_fail (GTK_IS_ADJUSTMENT (hadj));
 202   else if (layout->hadjustment)
 203     hadj = new_default_adjustment ();
 204   if (vadj)
 205     g_return_if_fail (GTK_IS_ADJUSTMENT (vadj));
 206   else if (layout->vadjustment)
 207     vadj = new_default_adjustment ();
 208
 209   if (layout->hadjustment && (layout->hadjustment != hadj))
 210     {
 211       g_signal_handlers_disconnect_by_func (layout->hadjustment,
 212                                             gtk_layout_adjustment_changed,
 213                                             layout);
 214       g_object_unref (layout->hadjustment);
 215     }
 216
 217   if (layout->vadjustment && (layout->vadjustment != vadj))
 218     {
 219       g_signal_handlers_disconnect_by_func (layout->vadjustment,
 220                                             gtk_layout_adjustment_changed,
 221                                             layout);
 222       g_object_unref (layout->vadjustment);
 223     }
 224
 225   if (layout->hadjustment != hadj)
 226     {
 227       layout->hadjustment = hadj;
 228       g_object_ref (layout->hadjustment);
 229       gtk_object_sink (GTK_OBJECT (layout->hadjustment));
 230       gtk_layout_set_adjustment_upper (layout->hadjustment, layout->width, FALSE);
 231
 232       g_signal_connect (layout->hadjustment, "value_changed",
 233                         G_CALLBACK (gtk_layout_adjustment_changed),
 234                         layout);
 235       need_adjust = TRUE;
 236     }
 237
 238   if (layout->vadjustment != vadj)
 239     {
 240       layout->vadjustment = vadj;
 241       g_object_ref (layout->vadjustment);
 242       gtk_object_sink (GTK_OBJECT (layout->vadjustment));
 243       gtk_layout_set_adjustment_upper (layout->vadjustment, layout->height, FALSE);
 244
 245       g_signal_connect (layout->vadjustment, "value_changed",
 246                         G_CALLBACK (gtk_layout_adjustment_changed),
 247                         layout);
 248       need_adjust = TRUE;
 249     }
 250
 251   /* vadj or hadj can be NULL while constructing; don't emit a signal
 252      then */
 253   if (need_adjust && vadj && hadj)
 254     gtk_layout_adjustment_changed (NULL, layout);
 255 }
 256
 257 static void
 258 gtk_layout_finalize (GObject *object)
 259 {
 260   GtkLayout *layout = GTK_LAYOUT (object);
 261
 262   g_object_unref (layout->hadjustment);
 263   g_object_unref (layout->vadjustment);
 264
 265   G_OBJECT_CLASS (parent_class)->finalize (object);
 266 }
 267
 268 /**
 269  * gtk_layout_set_hadjustment:
 270  * @layout: a #GtkLayout
 271  * @adjustment: new scroll adjustment
 272  *
 273  * Sets the horizontal scroll adjustment for the layout.
 274  *
 275  * See #GtkScrolledWindow, #GtkScrollbar, #GtkAdjustment for details.
 276  *
 277  **/
 278 void
 279 gtk_layout_set_hadjustment (GtkLayout     *layout,
 280                             GtkAdjustment *adjustment)
 281 {
 282   g_return_if_fail (GTK_IS_LAYOUT (layout));
 283
 284   gtk_layout_set_adjustments (layout, adjustment, layout->vadjustment);
 285   g_object_notify (G_OBJECT (layout), "hadjustment");
 286 }
 287
 288 /**
 289  * gtk_layout_set_vadjustment:
 290  * @layout: a #GtkLayout
 291  * @adjustment: new scroll adjustment
 292  *
 293  * Sets the vertical scroll adjustment for the layout.
 294  *
 295  * See #GtkScrolledWindow, #GtkScrollbar, #GtkAdjustment for details.
 296  *
 297  **/
 298 void
 299 gtk_layout_set_vadjustment (GtkLayout     *layout,
 300                             GtkAdjustment *adjustment)
 301 {
 302   g_return_if_fail (GTK_IS_LAYOUT (layout));
 303
 304   gtk_layout_set_adjustments (layout, layout->hadjustment, adjustment);
 305   g_object_notify (G_OBJECT (layout), "vadjustment");
 306 }
 307
 308 static GtkLayoutChild*
 309 get_child (GtkLayout  *layout,
 310            GtkWidget  *widget)
 311 {
 312   GList *children;
 313
 314   children = layout->children;
 315   while (children)
 316     {
 317       GtkLayoutChild *child;
 318
 319       child = children->data;
 320       children = children->next;
 321
 322       if (child->widget == widget)
 323         return child;
 324     }
 325
 326   return NULL;
 327 }
 328
 329 /**
 330  * gtk_layout_put:
 331  * @layout: a #GtkLayout
 332  * @child_widget: child widget
 333  * @x: X position of child widget
 334  * @y: Y position of child widget
 335  *
 336  * Adds @child_widget to @layout, at position (@x,@y).
 337  * @layout becomes the new parent container of @child_widget.
 338  *
 339  **/
 340 void
 341 gtk_layout_put (GtkLayout     *layout,
 342                 GtkWidget     *child_widget,
 343                 gint           x,
 344                 gint           y)
 345 {
 346   GtkLayoutChild *child;
 347
 348   g_return_if_fail (GTK_IS_LAYOUT (layout));
 349   g_return_if_fail (GTK_IS_WIDGET (child_widget));
 350
 351   child = g_new (GtkLayoutChild, 1);
 352
 353   child->widget = child_widget;
 354   child->x = x;
 355   child->y = y;
 356
 357   layout->children = g_list_append (layout->children, child);
 358
 359   if (GTK_WIDGET_REALIZED (layout))
 360     gtk_widget_set_parent_window (child->widget, layout->bin_window);
 361
 362   gtk_widget_set_parent (child_widget, GTK_WIDGET (layout));
 363 }
 364
 365 static void
 366 gtk_layout_move_internal (GtkLayout       *layout,
 367                           GtkWidget       *widget,
 368                           gboolean         change_x,
 369                           gint             x,
 370                           gboolean         change_y,
 371                           gint             y)
 372 {
 373   GtkLayoutChild *child;
 374
 375   g_return_if_fail (GTK_IS_LAYOUT (layout));
 376   g_return_if_fail (GTK_IS_WIDGET (widget));
 377   g_return_if_fail (widget->parent == GTK_WIDGET (layout));
 378
 379   child = get_child (layout, widget);
 380
 381   g_assert (child);
 382
 383   gtk_widget_freeze_child_notify (widget);
 384
 385   if (change_x)
 386     {
 387       child->x = x;
 388       gtk_widget_child_notify (widget, "x");
 389     }
 390
 391   if (change_y)
 392     {
 393       child->y = y;
 394       gtk_widget_child_notify (widget, "y");
 395     }
 396
 397   gtk_widget_thaw_child_notify (widget);
 398
 399   if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (layout))
 400     gtk_widget_queue_resize (GTK_WIDGET (widget));
 401 }
 402
 403 /**
 404  * gtk_layout_move:
 405  * @layout: a #GtkLayout
 406  * @child_widget: a current child of @layout
 407  * @x: X position to move to
 408  * @y: Y position to move to
 409  *
 410  * Moves a current child of @layout to a new position.
 411  *
 412  **/
 413 void
 414 gtk_layout_move (GtkLayout     *layout,
 415                  GtkWidget     *child_widget,
 416                  gint           x,
 417                  gint           y)
 418 {
 419   g_return_if_fail (GTK_IS_LAYOUT (layout));
 420   g_return_if_fail (GTK_IS_WIDGET (child_widget));
 421   g_return_if_fail (child_widget->parent == GTK_WIDGET (layout));
 422
 423   gtk_layout_move_internal (layout, child_widget, TRUE, x, TRUE, y);
 424 }
 425
 426 static void
 427 gtk_layout_set_adjustment_upper (GtkAdjustment *adj,
 428                                  gdouble        upper,
 429                                  gboolean       always_emit_changed)
 430 {
 431   gboolean changed = FALSE;
 432   gboolean value_changed = FALSE;
 433
 434   gdouble min = MAX (0., upper - adj->page_size);
 435
 436   if (upper != adj->upper)
 437     {
 438       adj->upper = upper;
 439       changed = TRUE;
 440     }
 441
 442   if (adj->value > min)
 443     {
 444       adj->value = min;
 445       value_changed = TRUE;
 446     }
 447
 448   if (changed || always_emit_changed)
 449     gtk_adjustment_changed (adj);
 450   if (value_changed)
 451     gtk_adjustment_value_changed (adj);
 452 }
 453
 454 /**
 455  * gtk_layout_set_size:
 456  * @layout: a #GtkLayout
 457  * @width: width of entire scrollable area
 458  * @height: height of entire scrollable area
 459  *
 460  * Sets the size of the scrollable area of the layout.
 461  *
 462  **/
 463 void
 464 gtk_layout_set_size (GtkLayout     *layout,
 465                      guint          width,
 466                      guint          height)
 467 {
 468   GtkWidget *widget;
 469
 470   g_return_if_fail (GTK_IS_LAYOUT (layout));
 471
 472   widget = GTK_WIDGET (layout);
 473
 474   g_object_freeze_notify (G_OBJECT (layout));
 475   if (width != layout->width)
 476      {
 477         layout->width = width;
 478         g_object_notify (G_OBJECT (layout), "width");
 479      }
 480   if (height != layout->height)
 481      {
 482         layout->height = height;
 483         g_object_notify (G_OBJECT (layout), "height");
 484      }
 485   g_object_thaw_notify (G_OBJECT (layout));
 486
 487   if (layout->hadjustment)
 488     gtk_layout_set_adjustment_upper (layout->hadjustment, layout->width, FALSE);
 489   if (layout->vadjustment)
 490     gtk_layout_set_adjustment_upper (layout->vadjustment, layout->height, FALSE);
 491
 492   if (GTK_WIDGET_REALIZED (layout))
 493     {
 494       width = MAX (width, widget->allocation.width);
 495       height = MAX (height, widget->allocation.height);
 496       gdk_window_resize (layout->bin_window, width, height);
 497     }
 498 }
 499
 500 /**
 501  * gtk_layout_get_size:
 502  * @layout: a #GtkLayout
 503  * @width: location to store the width set on @layout, or %NULL
 504  * @height: location to store the height set on @layout, or %NULL
 505  *
 506  * Gets the size that has been set on the layout, and that determines
 507  * the total extents of the layout's scrollbar area. See
 508  * gtk_layout_set_size ().
 509  **/
 510 void
 511 gtk_layout_get_size (GtkLayout *layout,
 512                      guint     *width,
 513                      guint     *height)
 514 {
 515   g_return_if_fail (GTK_IS_LAYOUT (layout));
 516
 517   if (width)
 518     *width = layout->width;
 519   if (height)
 520     *height = layout->height;
 521 }
 522
 523 /**
 524  * gtk_layout_freeze:
 525  * @layout: a #GtkLayout
 526  *
 527  * This is a deprecated function, it doesn't do anything useful.
 528  **/
 529 void
 530 gtk_layout_freeze (GtkLayout *layout)
 531 {
 532   g_return_if_fail (GTK_IS_LAYOUT (layout));
 533
 534   layout->freeze_count++;
 535 }
 536
 537 /**
 538  * gtk_layout_thaw:
 539  * @layout: a #GtkLayout
 540  *
 541  * This is a deprecated function, it doesn't do anything useful.
 542  **/
 543 void
 544 gtk_layout_thaw (GtkLayout *layout)
 545 {
 546   g_return_if_fail (GTK_IS_LAYOUT (layout));
 547
 548   if (layout->freeze_count)
 549     {
 550       if (!(--layout->freeze_count))
 551         {
 552           gtk_widget_queue_draw (GTK_WIDGET (layout));
 553           gdk_window_process_updates (GTK_WIDGET (layout)->window, TRUE);
 554         }
 555     }
 556
 557 }
 558
 559 /* Basic Object handling procedures
 560  */
 561 GType
 562 gtk_layout_get_type (void)
 563 {
 564   static GType layout_type = 0;
 565
 566   if (!layout_type)
 567     {
 568       static const GTypeInfo layout_info =
 569       {
 570         sizeof (GtkLayoutClass),
 571         NULL,           /* base_init */
 572         NULL,           /* base_finalize */
 573         (GClassInitFunc) gtk_layout_class_init,
 574         NULL,           /* class_finalize */
 575         NULL,           /* class_data */
 576         sizeof (GtkLayout),
 577         0,              /* n_preallocs */
 578         (GInstanceInitFunc) gtk_layout_init,
 579       };
 580
 581       layout_type = g_type_register_static (GTK_TYPE_CONTAINER, "GtkLayout",
 582                                             &layout_info, 0);
 583     }
 584
 585   return layout_type;
 586 }
 587
 588 static void
 589 gtk_layout_class_init (GtkLayoutClass *class)
 590 {
 591   GObjectClass *gobject_class;
 592   GtkWidgetClass *widget_class;
 593   GtkContainerClass *container_class;
 594
 595   gobject_class = (GObjectClass*) class;
 596   widget_class = (GtkWidgetClass*) class;
 597   container_class = (GtkContainerClass*) class;
 598
 599   parent_class = g_type_class_peek_parent (class);
 600
 601   gobject_class->set_property = gtk_layout_set_property;
 602   gobject_class->get_property = gtk_layout_get_property;
 603   gobject_class->finalize = gtk_layout_finalize;
 604   gobject_class->constructor = gtk_layout_constructor;
 605
 606   container_class->set_child_property = gtk_layout_set_child_property;
 607   container_class->get_child_property = gtk_layout_get_child_property;
 608
 609   gtk_container_class_install_child_property (container_class,
 610                                               CHILD_PROP_X,
 611                                               g_param_spec_int ("x",
 612                                                                 P_("X position"),
 613                                                                 P_("X position of child widget"),
 614                                                                 G_MININT,
 615                                                                 G_MAXINT,
 616                                                                 0,
 617                                                                 G_PARAM_READWRITE));
 618
 619   gtk_container_class_install_child_property (container_class,
 620                                               CHILD_PROP_Y,
 621                                               g_param_spec_int ("y",
 622                                                                 P_("Y position"),
 623                                                                 P_("Y position of child widget"),
 624                                                                 G_MININT,
 625                                                                 G_MAXINT,
 626                                                                 0,
 627                                                                 G_PARAM_READWRITE));
 628
 629   g_object_class_install_property (gobject_class,
 630                                    PROP_HADJUSTMENT,
 631                                    g_param_spec_object ("hadjustment",
 632                                                         P_("Horizontal adjustment"),
 633                                                         P_("The GtkAdjustment for the horizontal position"),
 634                                                         GTK_TYPE_ADJUSTMENT,
 635                                                         G_PARAM_READWRITE));
 636
 637   g_object_class_install_property (gobject_class,
 638                                    PROP_VADJUSTMENT,
 639                                    g_param_spec_object ("vadjustment",
 640                                                         P_("Vertical adjustment"),
 641                                                         P_("The GtkAdjustment for the vertical position"),
 642                                                         GTK_TYPE_ADJUSTMENT,
 643                                                         G_PARAM_READWRITE));
 644
 645   g_object_class_install_property (gobject_class,
 646                                    PROP_WIDTH,
 647                                    g_param_spec_uint ("width",
 648                                                      P_("Width"),
 649                                                      P_("The width of the layout"),
 650                                                      0,
 651                                                      G_MAXINT,
 652                                                      100,
 653                                                      G_PARAM_READWRITE));
 654   g_object_class_install_property (gobject_class,
 655                                    PROP_HEIGHT,
 656                                    g_param_spec_uint ("height",
 657                                                      P_("Height"),
 658                                                      P_("The height of the layout"),
 659                                                      0,
 660                                                      G_MAXINT,
 661                                                      100,
 662                                                      G_PARAM_READWRITE));
 663   widget_class->realize = gtk_layout_realize;
 664   widget_class->unrealize = gtk_layout_unrealize;
 665   widget_class->map = gtk_layout_map;
 666   widget_class->size_request = gtk_layout_size_request;
 667   widget_class->size_allocate = gtk_layout_size_allocate;
 668   widget_class->expose_event = gtk_layout_expose;
 669   widget_class->style_set = gtk_layout_style_set;
 670
 671   container_class->remove = gtk_layout_remove;
 672   container_class->forall = gtk_layout_forall;
 673
 674   class->set_scroll_adjustments = gtk_layout_set_adjustments;
 675
 676   widget_class->set_scroll_adjustments_signal =
 677     g_signal_new ("set_scroll_adjustments",
 678                   G_OBJECT_CLASS_TYPE (gobject_class),
 679                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 680                   G_STRUCT_OFFSET (GtkLayoutClass, set_scroll_adjustments),
 681                   NULL, NULL,
 682                   _gtk_marshal_VOID__OBJECT_OBJECT,
 683                   G_TYPE_NONE, 2,
 684                   GTK_TYPE_ADJUSTMENT,
 685                   GTK_TYPE_ADJUSTMENT);
 686 }
 687
 688 static void
 689 gtk_layout_get_property (GObject     *object,
 690                          guint        prop_id,
 691                          GValue      *value,
 692                          GParamSpec  *pspec)
 693 {
 694   GtkLayout *layout = GTK_LAYOUT (object);
 695
 696   switch (prop_id)
 697     {
 698     case PROP_HADJUSTMENT:
 699       g_value_set_object (value, layout->hadjustment);
 700       break;
 701     case PROP_VADJUSTMENT:
 702       g_value_set_object (value, layout->vadjustment);
 703       break;
 704     case PROP_WIDTH:
 705       g_value_set_uint (value, layout->width);
 706       break;
 707     case PROP_HEIGHT:
 708       g_value_set_uint (value, layout->height);
 709       break;
 710     default:
 711       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 712       break;
 713     }
 714 }
 715
 716 static void
 717 gtk_layout_set_property (GObject      *object,
 718                          guint         prop_id,
 719                          const GValue *value,
 720                          GParamSpec   *pspec)
 721 {
 722   GtkLayout *layout = GTK_LAYOUT (object);
 723
 724   switch (prop_id)
 725     {
 726     case PROP_HADJUSTMENT:
 727       gtk_layout_set_hadjustment (layout,
 728                                   (GtkAdjustment*) g_value_get_object (value));
 729       break;
 730     case PROP_VADJUSTMENT:
 731       gtk_layout_set_vadjustment (layout,
 732                                   (GtkAdjustment*) g_value_get_object (value));
 733       break;
 734     case PROP_WIDTH:
 735       gtk_layout_set_size (layout, g_value_get_uint (value),
 736                            layout->height);
 737       break;
 738     case PROP_HEIGHT:
 739       gtk_layout_set_size (layout, layout->width,
 740                            g_value_get_uint (value));
 741       break;
 742     default:
 743       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 744       break;
 745     }
 746 }
 747
 748 static void
 749 gtk_layout_set_child_property (GtkContainer    *container,
 750                                GtkWidget       *child,
 751                                guint            property_id,
 752                                const GValue    *value,
 753                                GParamSpec      *pspec)
 754 {
 755   switch (property_id)
 756     {
 757     case CHILD_PROP_X:
 758       gtk_layout_move_internal (GTK_LAYOUT (container),
 759                                 child,
 760                                 TRUE, g_value_get_int (value),
 761                                 FALSE, 0);
 762       break;
 763     case CHILD_PROP_Y:
 764       gtk_layout_move_internal (GTK_LAYOUT (container),
 765                                 child,
 766                                 FALSE, 0,
 767                                 TRUE, g_value_get_int (value));
 768       break;
 769     default:
 770       GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
 771       break;
 772     }
 773 }
 774
 775 static void
 776 gtk_layout_get_child_property (GtkContainer *container,
 777                                GtkWidget    *child,
 778                                guint         property_id,
 779                                GValue       *value,
 780                                GParamSpec   *pspec)
 781 {
 782   GtkLayoutChild *layout_child;
 783
 784   layout_child = get_child (GTK_LAYOUT (container), child);
 785
 786   switch (property_id)
 787     {
 788     case CHILD_PROP_X:
 789       g_value_set_int (value, layout_child->x);
 790       break;
 791     case CHILD_PROP_Y:
 792       g_value_set_int (value, layout_child->y);
 793       break;
 794     default:
 795       GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
 796       break;
 797     }
 798 }
 799
 800 static void
 801 gtk_layout_init (GtkLayout *layout)
 802 {
 803   layout->children = NULL;
 804
 805   layout->width = 100;
 806   layout->height = 100;
 807
 808   layout->hadjustment = NULL;
 809   layout->vadjustment = NULL;
 810
 811   layout->bin_window = NULL;
 812
 813   layout->scroll_x = 0;
 814   layout->scroll_y = 0;
 815   layout->visibility = GDK_VISIBILITY_PARTIAL;
 816
 817   layout->freeze_count = 0;
 818 }
 819
 820 static GObject *
 821 gtk_layout_constructor (GType                  type,
 822                         guint                  n_properties,
 823                         GObjectConstructParam *properties)
 824 {
 825   GtkLayout *layout;
 826   GObject *object;
 827   GtkAdjustment *hadj, *vadj;
 828
 829   object = G_OBJECT_CLASS (parent_class)->constructor (type,
 830                                                        n_properties,
 831                                                        properties);
 832
 833   layout = GTK_LAYOUT (object);
 834
 835   hadj = layout->hadjustment ? layout->hadjustment : new_default_adjustment ();
 836   vadj = layout->vadjustment ? layout->vadjustment : new_default_adjustment ();
 837
 838   if (!layout->hadjustment || !layout->vadjustment)
 839     gtk_layout_set_adjustments (layout, hadj, vadj);
 840
 841   return object;
 842 }
 843
 844 /* Widget methods
 845  */
 846
 847 static void
 848 gtk_layout_realize (GtkWidget *widget)
 849 {
 850   GList *tmp_list;
 851   GtkLayout *layout;
 852   GdkWindowAttr attributes;
 853   gint attributes_mask;
 854
 855   g_return_if_fail (GTK_IS_LAYOUT (widget));
 856
 857   layout = GTK_LAYOUT (widget);
 858   GTK_WIDGET_SET_FLAGS (layout, GTK_REALIZED);
 859
 860   attributes.window_type = GDK_WINDOW_CHILD;
 861   attributes.x = widget->allocation.x;
 862   attributes.y = widget->allocation.y;
 863   attributes.width = widget->allocation.width;
 864   attributes.height = widget->allocation.height;
 865   attributes.wclass = GDK_INPUT_OUTPUT;
 866   attributes.visual = gtk_widget_get_visual (widget);
 867   attributes.colormap = gtk_widget_get_colormap (widget);
 868   attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;
 869
 870   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 871
 872   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 873                                    &attributes, attributes_mask);
 874   gdk_window_set_user_data (widget->window, widget);
 875
 876   attributes.x = - layout->hadjustment->value,
 877   attributes.y = - layout->vadjustment->value;
 878   attributes.width = MAX (layout->width, widget->allocation.width);
 879   attributes.height = MAX (layout->height, widget->allocation.height);
 880   attributes.event_mask = GDK_EXPOSURE_MASK | GDK_SCROLL_MASK |
 881                           gtk_widget_get_events (widget);
 882
 883   layout->bin_window = gdk_window_new (widget->window,
 884                                         &attributes, attributes_mask);
 885   gdk_window_set_user_data (layout->bin_window, widget);
 886
 887   widget->style = gtk_style_attach (widget->style, widget->window);
 888   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 889   gtk_style_set_background (widget->style, layout->bin_window, GTK_STATE_NORMAL);
 890
 891   tmp_list = layout->children;
 892   while (tmp_list)
 893     {
 894       GtkLayoutChild *child = tmp_list->data;
 895       tmp_list = tmp_list->next;
 896
 897       gtk_widget_set_parent_window (child->widget, layout->bin_window);
 898     }
 899 }
 900
 901 static void
 902 gtk_layout_style_set (GtkWidget *widget, GtkStyle *old_style)
 903 {
 904   if (GTK_WIDGET_CLASS (parent_class)->style_set)
 905     (* GTK_WIDGET_CLASS (parent_class)->style_set) (widget, old_style);
 906
 907   if (GTK_WIDGET_REALIZED (widget))
 908     {
 909       gtk_style_set_background (widget->style, GTK_LAYOUT (widget)->bin_window, GTK_STATE_NORMAL);
 910     }
 911 }
 912
 913 static void
 914 gtk_layout_map (GtkWidget *widget)
 915 {
 916   GList *tmp_list;
 917   GtkLayout *layout;
 918
 919   g_return_if_fail (GTK_IS_LAYOUT (widget));
 920
 921   layout = GTK_LAYOUT (widget);
 922
 923   GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 924
 925   tmp_list = layout->children;
 926   while (tmp_list)
 927     {
 928       GtkLayoutChild *child = tmp_list->data;
 929       tmp_list = tmp_list->next;
 930
 931       if (GTK_WIDGET_VISIBLE (child->widget))
 932         {
 933           if (!GTK_WIDGET_MAPPED (child->widget))
 934             gtk_widget_map (child->widget);
 935         }
 936     }
 937
 938   gdk_window_show (layout->bin_window);
 939   gdk_window_show (widget->window);
 940 }
 941
 942 static void
 943 gtk_layout_unrealize (GtkWidget *widget)
 944 {
 945   GtkLayout *layout;
 946
 947   g_return_if_fail (GTK_IS_LAYOUT (widget));
 948
 949   layout = GTK_LAYOUT (widget);
 950
 951   gdk_window_set_user_data (layout->bin_window, NULL);
 952   gdk_window_destroy (layout->bin_window);
 953   layout->bin_window = NULL;
 954
 955   if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 956     (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 957 }
 958
 959 static void
 960 gtk_layout_size_request (GtkWidget     *widget,
 961                          GtkRequisition *requisition)
 962 {
 963   GList *tmp_list;
 964   GtkLayout *layout;
 965
 966   g_return_if_fail (GTK_IS_LAYOUT (widget));
 967
 968   layout = GTK_LAYOUT (widget);
 969
 970   requisition->width = 0;
 971   requisition->height = 0;
 972
 973   tmp_list = layout->children;
 974
 975   while (tmp_list)
 976     {
 977       GtkLayoutChild *child = tmp_list->data;
 978       GtkRequisition child_requisition;
 979
 980       tmp_list = tmp_list->next;
 981
 982       gtk_widget_size_request (child->widget, &child_requisition);
 983     }
 984 }
 985
 986 static void
 987 gtk_layout_size_allocate (GtkWidget     *widget,
 988                           GtkAllocation *allocation)
 989 {
 990   GList *tmp_list;
 991   GtkLayout *layout;
 992
 993   g_return_if_fail (GTK_IS_LAYOUT (widget));
 994
 995   widget->allocation = *allocation;
 996
 997   layout = GTK_LAYOUT (widget);
 998
 999   tmp_list = layout->children;
1000
1001   while (tmp_list)
1002     {
1003       GtkLayoutChild *child = tmp_list->data;
1004       tmp_list = tmp_list->next;
1005
1006       gtk_layout_allocate_child (layout, child);
1007     }
1008
1009   if (GTK_WIDGET_REALIZED (widget))
1010     {
1011       gdk_window_move_resize (widget->window,
1012                               allocation->x, allocation->y,
1013                               allocation->width, allocation->height);
1014
1015       gdk_window_resize (layout->bin_window,
1016                          MAX (layout->width, allocation->width),
1017                          MAX (layout->height, allocation->height));
1018     }
1019
1020   layout->hadjustment->page_size = allocation->width;
1021   layout->hadjustment->page_increment = allocation->width * 0.9;
1022   layout->hadjustment->lower = 0;
1023   /* set_adjustment_upper() emits ::changed */
1024   gtk_layout_set_adjustment_upper (layout->hadjustment, MAX (allocation->width, layout->width), TRUE);
1025
1026   layout->vadjustment->page_size = allocation->height;
1027   layout->vadjustment->page_increment = allocation->height * 0.9;
1028   layout->vadjustment->lower = 0;
1029   layout->vadjustment->upper = MAX (allocation->height, layout->height);
1030   gtk_layout_set_adjustment_upper (layout->vadjustment, MAX (allocation->height, layout->height), TRUE);
1031 }
1032
1033 static gint
1034 gtk_layout_expose (GtkWidget *widget, GdkEventExpose *event)
1035 {
1036   GtkLayout *layout;
1037
1038   g_return_val_if_fail (GTK_IS_LAYOUT (widget), FALSE);
1039
1040   layout = GTK_LAYOUT (widget);
1041
1042   if (event->window != layout->bin_window)
1043     return FALSE;
1044
1045   (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
1046
1047   return FALSE;
1048 }
1049
1050 /* Container method
1051  */
1052 static void
1053 gtk_layout_remove (GtkContainer *container,
1054                    GtkWidget    *widget)
1055 {
1056   GList *tmp_list;
1057   GtkLayout *layout;
1058   GtkLayoutChild *child = NULL;
1059
1060   g_return_if_fail (GTK_IS_LAYOUT (container));
1061
1062   layout = GTK_LAYOUT (container);
1063
1064   tmp_list = layout->children;
1065   while (tmp_list)
1066     {
1067       child = tmp_list->data;
1068       if (child->widget == widget)
1069         break;
1070       tmp_list = tmp_list->next;
1071     }
1072
1073   if (tmp_list)
1074     {
1075       gtk_widget_unparent (widget);
1076
1077       layout->children = g_list_remove_link (layout->children, tmp_list);
1078       g_list_free_1 (tmp_list);
1079       g_free (child);
1080     }
1081 }
1082
1083 static void
1084 gtk_layout_forall (GtkContainer *container,
1085                    gboolean      include_internals,
1086                    GtkCallback   callback,
1087                    gpointer      callback_data)
1088 {
1089   GtkLayout *layout;
1090   GtkLayoutChild *child;
1091   GList *tmp_list;
1092
1093   g_return_if_fail (GTK_IS_LAYOUT (container));
1094   g_return_if_fail (callback != NULL);
1095
1096   layout = GTK_LAYOUT (container);
1097
1098   tmp_list = layout->children;
1099   while (tmp_list)
1100     {
1101       child = tmp_list->data;
1102       tmp_list = tmp_list->next;
1103
1104       (* callback) (child->widget, callback_data);
1105     }
1106 }
1107
1108 /* Operations on children
1109  */
1110
1111 static void
1112 gtk_layout_allocate_child (GtkLayout      *layout,
1113                            GtkLayoutChild *child)
1114 {
1115   GtkAllocation allocation;
1116   GtkRequisition requisition;
1117
1118   allocation.x = child->x;
1119   allocation.y = child->y;
1120   gtk_widget_get_child_requisition (child->widget, &requisition);
1121   allocation.width = requisition.width;
1122   allocation.height = requisition.height;
1123
1124   gtk_widget_size_allocate (child->widget, &allocation);
1125 }
1126
1127 /* Callbacks */
1128
1129 static void
1130 gtk_layout_adjustment_changed (GtkAdjustment *adjustment,
1131                                GtkLayout     *layout)
1132 {
1133   GtkWidget *widget;
1134
1135   widget = GTK_WIDGET (layout);
1136
1137   if (layout->freeze_count)
1138     return;
1139
1140   if (GTK_WIDGET_REALIZED (layout))
1141     {
1142       gdk_window_move (layout->bin_window,
1143                        - layout->hadjustment->value,
1144                        - layout->vadjustment->value);
1145
1146       gdk_window_process_updates (layout->bin_window, TRUE);
1147     }
1148 }