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 #include "gtkalias.h"
  39
  40 typedef struct _GtkLayoutChild   GtkLayoutChild;
  41
  42 struct _GtkLayoutChild {
  43   GtkWidget *widget;
  44   gint x;
  45   gint y;
  46 };
  47
  48 enum {
  49    PROP_0,
  50    PROP_HADJUSTMENT,
  51    PROP_VADJUSTMENT,
  52    PROP_WIDTH,
  53    PROP_HEIGHT
  54 };
  55
  56 enum {
  57   CHILD_PROP_0,
  58   CHILD_PROP_X,
  59   CHILD_PROP_Y
  60 };
  61
  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_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_add                (GtkContainer   *container,
  84                                            GtkWidget      *widget);
  85 static void gtk_layout_remove             (GtkContainer   *container,
  86                                            GtkWidget      *widget);
  87 static void gtk_layout_forall             (GtkContainer   *container,
  88                                            gboolean        include_internals,
  89                                            GtkCallback     callback,
  90                                            gpointer        callback_data);
  91 static void gtk_layout_set_adjustments    (GtkLayout      *layout,
  92                                            GtkAdjustment  *hadj,
  93                                            GtkAdjustment  *vadj);
  94 static void gtk_layout_set_child_property (GtkContainer   *container,
  95                                            GtkWidget      *child,
  96                                            guint           property_id,
  97                                            const GValue   *value,
  98                                            GParamSpec     *pspec);
  99 static void gtk_layout_get_child_property (GtkContainer   *container,
 100                                            GtkWidget      *child,
 101                                            guint           property_id,
 102                                            GValue         *value,
 103                                            GParamSpec     *pspec);
 104 static void gtk_layout_allocate_child     (GtkLayout      *layout,
 105                                            GtkLayoutChild *child);
 106 static void gtk_layout_adjustment_changed (GtkAdjustment  *adjustment,
 107                                            GtkLayout      *layout);
 108 static void gtk_layout_style_set          (GtkWidget      *widget,
 109                                            GtkStyle       *old_style);
 110
 111 static void gtk_layout_set_adjustment_upper (GtkAdjustment *adj,
 112                                              gdouble        upper,
 113                                              gboolean       always_emit_changed);
 114
 115 G_DEFINE_TYPE (GtkLayout, gtk_layout, GTK_TYPE_CONTAINER)
 116
 117 /* Public interface
 118  */
 119 /**
 120  * gtk_layout_new:
 121  * @hadjustment: horizontal scroll adjustment, or %NULL
 122  * @vadjustment: vertical scroll adjustment, or %NULL
 123  *
 124  * Creates a new #GtkLayout. Unless you have a specific adjustment
 125  * you'd like the layout to use for scrolling, pass %NULL for
 126  * @hadjustment and @vadjustment.
 127  *
 128  * Return value: a new #GtkLayout
 129  **/
 130
 131 GtkWidget*
 132 gtk_layout_new (GtkAdjustment *hadjustment,
 133                 GtkAdjustment *vadjustment)
 134 {
 135   GtkLayout *layout;
 136
 137   layout = g_object_new (GTK_TYPE_LAYOUT,
 138                          "hadjustment", hadjustment,
 139                          "vadjustment", vadjustment,
 140                          NULL);
 141
 142   return GTK_WIDGET (layout);
 143 }
 144
 145 /**
 146  * gtk_layout_get_bin_window:
 147  * @layout: a #GtkLayout
 148  *
 149  * Retrieve the bin window of the layout used for drawing operations.
 150  *
 151  * Return value: a #GdkWindow
 152  *
 153  * Since: 2.14
 154  **/
 155 GdkWindow*
 156 gtk_layout_get_bin_window (GtkLayout *layout)
 157 {
 158   g_return_val_if_fail (GTK_IS_LAYOUT (layout), NULL);
 159
 160   return layout->bin_window;
 161 }
 162
 163 /**
 164  * gtk_layout_get_hadjustment:
 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 horizontal scrollbar and @layout.
 171  *
 172  * See #GtkScrolledWindow, #GtkScrollbar, #GtkAdjustment for details.
 173  *
 174  * Return value: horizontal scroll adjustment
 175  **/
 176 GtkAdjustment*
 177 gtk_layout_get_hadjustment (GtkLayout     *layout)
 178 {
 179   g_return_val_if_fail (GTK_IS_LAYOUT (layout), NULL);
 180
 181   return layout->hadjustment;
 182 }
 183 /**
 184  * gtk_layout_get_vadjustment:
 185  * @layout: a #GtkLayout
 186  *
 187  * This function should only be called after the layout has been
 188  * placed in a #GtkScrolledWindow or otherwise configured for
 189  * scrolling. It returns the #GtkAdjustment used for communication
 190  * between the vertical scrollbar and @layout.
 191  *
 192  * See #GtkScrolledWindow, #GtkScrollbar, #GtkAdjustment for details.
 193  *
 194  * Return value: vertical scroll adjustment
 195  **/
 196 GtkAdjustment*
 197 gtk_layout_get_vadjustment (GtkLayout     *layout)
 198 {
 199   g_return_val_if_fail (GTK_IS_LAYOUT (layout), NULL);
 200
 201   return layout->vadjustment;
 202 }
 203
 204 static GtkAdjustment *
 205 new_default_adjustment (void)
 206 {
 207   return GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
 208 }
 209
 210 static void
 211 gtk_layout_set_adjustments (GtkLayout     *layout,
 212                             GtkAdjustment *hadj,
 213                             GtkAdjustment *vadj)
 214 {
 215   gboolean need_adjust = FALSE;
 216
 217   g_return_if_fail (GTK_IS_LAYOUT (layout));
 218
 219   if (hadj)
 220     g_return_if_fail (GTK_IS_ADJUSTMENT (hadj));
 221   else if (layout->hadjustment)
 222     hadj = new_default_adjustment ();
 223   if (vadj)
 224     g_return_if_fail (GTK_IS_ADJUSTMENT (vadj));
 225   else if (layout->vadjustment)
 226     vadj = new_default_adjustment ();
 227
 228   if (layout->hadjustment && (layout->hadjustment != hadj))
 229     {
 230       g_signal_handlers_disconnect_by_func (layout->hadjustment,
 231                                             gtk_layout_adjustment_changed,
 232                                             layout);
 233       g_object_unref (layout->hadjustment);
 234     }
 235
 236   if (layout->vadjustment && (layout->vadjustment != vadj))
 237     {
 238       g_signal_handlers_disconnect_by_func (layout->vadjustment,
 239                                             gtk_layout_adjustment_changed,
 240                                             layout);
 241       g_object_unref (layout->vadjustment);
 242     }
 243
 244   if (layout->hadjustment != hadj)
 245     {
 246       layout->hadjustment = hadj;
 247       g_object_ref_sink (layout->hadjustment);
 248       gtk_layout_set_adjustment_upper (layout->hadjustment, layout->width, FALSE);
 249
 250       g_signal_connect (layout->hadjustment, "value-changed",
 251                         G_CALLBACK (gtk_layout_adjustment_changed),
 252                         layout);
 253       need_adjust = TRUE;
 254     }
 255
 256   if (layout->vadjustment != vadj)
 257     {
 258       layout->vadjustment = vadj;
 259       g_object_ref_sink (layout->vadjustment);
 260       gtk_layout_set_adjustment_upper (layout->vadjustment, layout->height, FALSE);
 261
 262       g_signal_connect (layout->vadjustment, "value-changed",
 263                         G_CALLBACK (gtk_layout_adjustment_changed),
 264                         layout);
 265       need_adjust = TRUE;
 266     }
 267
 268   /* vadj or hadj can be NULL while constructing; don't emit a signal
 269      then */
 270   if (need_adjust && vadj && hadj)
 271     gtk_layout_adjustment_changed (NULL, layout);
 272 }
 273
 274 static void
 275 gtk_layout_finalize (GObject *object)
 276 {
 277   GtkLayout *layout = GTK_LAYOUT (object);
 278
 279   g_object_unref (layout->hadjustment);
 280   g_object_unref (layout->vadjustment);
 281
 282   G_OBJECT_CLASS (gtk_layout_parent_class)->finalize (object);
 283 }
 284
 285 /**
 286  * gtk_layout_set_hadjustment:
 287  * @layout: a #GtkLayout
 288  * @adjustment: new scroll adjustment
 289  *
 290  * Sets the horizontal scroll adjustment for the layout.
 291  *
 292  * See #GtkScrolledWindow, #GtkScrollbar, #GtkAdjustment for details.
 293  *
 294  **/
 295 void
 296 gtk_layout_set_hadjustment (GtkLayout     *layout,
 297                             GtkAdjustment *adjustment)
 298 {
 299   g_return_if_fail (GTK_IS_LAYOUT (layout));
 300
 301   gtk_layout_set_adjustments (layout, adjustment, layout->vadjustment);
 302   g_object_notify (G_OBJECT (layout), "hadjustment");
 303 }
 304
 305 /**
 306  * gtk_layout_set_vadjustment:
 307  * @layout: a #GtkLayout
 308  * @adjustment: new scroll adjustment
 309  *
 310  * Sets the vertical scroll adjustment for the layout.
 311  *
 312  * See #GtkScrolledWindow, #GtkScrollbar, #GtkAdjustment for details.
 313  *
 314  **/
 315 void
 316 gtk_layout_set_vadjustment (GtkLayout     *layout,
 317                             GtkAdjustment *adjustment)
 318 {
 319   g_return_if_fail (GTK_IS_LAYOUT (layout));
 320
 321   gtk_layout_set_adjustments (layout, layout->hadjustment, adjustment);
 322   g_object_notify (G_OBJECT (layout), "vadjustment");
 323 }
 324
 325 static GtkLayoutChild*
 326 get_child (GtkLayout  *layout,
 327            GtkWidget  *widget)
 328 {
 329   GList *children;
 330
 331   children = layout->children;
 332   while (children)
 333     {
 334       GtkLayoutChild *child;
 335
 336       child = children->data;
 337       children = children->next;
 338
 339       if (child->widget == widget)
 340         return child;
 341     }
 342
 343   return NULL;
 344 }
 345
 346 /**
 347  * gtk_layout_put:
 348  * @layout: a #GtkLayout
 349  * @child_widget: child widget
 350  * @x: X position of child widget
 351  * @y: Y position of child widget
 352  *
 353  * Adds @child_widget to @layout, at position (@x,@y).
 354  * @layout becomes the new parent container of @child_widget.
 355  *
 356  **/
 357 void
 358 gtk_layout_put (GtkLayout     *layout,
 359                 GtkWidget     *child_widget,
 360                 gint           x,
 361                 gint           y)
 362 {
 363   GtkLayoutChild *child;
 364
 365   g_return_if_fail (GTK_IS_LAYOUT (layout));
 366   g_return_if_fail (GTK_IS_WIDGET (child_widget));
 367
 368   child = g_new (GtkLayoutChild, 1);
 369
 370   child->widget = child_widget;
 371   child->x = x;
 372   child->y = y;
 373
 374   layout->children = g_list_append (layout->children, child);
 375
 376   if (GTK_WIDGET_REALIZED (layout))
 377     gtk_widget_set_parent_window (child->widget, layout->bin_window);
 378
 379   gtk_widget_set_parent (child_widget, GTK_WIDGET (layout));
 380 }
 381
 382 static void
 383 gtk_layout_move_internal (GtkLayout       *layout,
 384                           GtkWidget       *widget,
 385                           gboolean         change_x,
 386                           gint             x,
 387                           gboolean         change_y,
 388                           gint             y)
 389 {
 390   GtkLayoutChild *child;
 391
 392   child = get_child (layout, widget);
 393
 394   g_assert (child);
 395
 396   gtk_widget_freeze_child_notify (widget);
 397
 398   if (change_x)
 399     {
 400       child->x = x;
 401       gtk_widget_child_notify (widget, "x");
 402     }
 403
 404   if (change_y)
 405     {
 406       child->y = y;
 407       gtk_widget_child_notify (widget, "y");
 408     }
 409
 410   gtk_widget_thaw_child_notify (widget);
 411
 412   if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (layout))
 413     gtk_widget_queue_resize (GTK_WIDGET (widget));
 414 }
 415
 416 /**
 417  * gtk_layout_move:
 418  * @layout: a #GtkLayout
 419  * @child_widget: a current child of @layout
 420  * @x: X position to move to
 421  * @y: Y position to move to
 422  *
 423  * Moves a current child of @layout to a new position.
 424  *
 425  **/
 426 void
 427 gtk_layout_move (GtkLayout     *layout,
 428                  GtkWidget     *child_widget,
 429                  gint           x,
 430                  gint           y)
 431 {
 432   g_return_if_fail (GTK_IS_LAYOUT (layout));
 433   g_return_if_fail (GTK_IS_WIDGET (child_widget));
 434   g_return_if_fail (child_widget->parent == GTK_WIDGET (layout));
 435
 436   gtk_layout_move_internal (layout, child_widget, TRUE, x, TRUE, y);
 437 }
 438
 439 static void
 440 gtk_layout_set_adjustment_upper (GtkAdjustment *adj,
 441                                  gdouble        upper,
 442                                  gboolean       always_emit_changed)
 443 {
 444   gboolean changed = FALSE;
 445   gboolean value_changed = FALSE;
 446
 447   gdouble min = MAX (0., upper - adj->page_size);
 448
 449   if (upper != adj->upper)
 450     {
 451       adj->upper = upper;
 452       changed = TRUE;
 453     }
 454
 455   if (adj->value > min)
 456     {
 457       adj->value = min;
 458       value_changed = TRUE;
 459     }
 460
 461   if (changed || always_emit_changed)
 462     gtk_adjustment_changed (adj);
 463   if (value_changed)
 464     gtk_adjustment_value_changed (adj);
 465 }
 466
 467 /**
 468  * gtk_layout_set_size:
 469  * @layout: a #GtkLayout
 470  * @width: width of entire scrollable area
 471  * @height: height of entire scrollable area
 472  *
 473  * Sets the size of the scrollable area of the layout.
 474  *
 475  **/
 476 void
 477 gtk_layout_set_size (GtkLayout     *layout,
 478                      guint          width,
 479                      guint          height)
 480 {
 481   GtkWidget *widget;
 482
 483   g_return_if_fail (GTK_IS_LAYOUT (layout));
 484
 485   widget = GTK_WIDGET (layout);
 486
 487   g_object_freeze_notify (G_OBJECT (layout));
 488   if (width != layout->width)
 489      {
 490         layout->width = width;
 491         g_object_notify (G_OBJECT (layout), "width");
 492      }
 493   if (height != layout->height)
 494      {
 495         layout->height = height;
 496         g_object_notify (G_OBJECT (layout), "height");
 497      }
 498   g_object_thaw_notify (G_OBJECT (layout));
 499
 500   if (layout->hadjustment)
 501     gtk_layout_set_adjustment_upper (layout->hadjustment, layout->width, FALSE);
 502   if (layout->vadjustment)
 503     gtk_layout_set_adjustment_upper (layout->vadjustment, layout->height, FALSE);
 504
 505   if (GTK_WIDGET_REALIZED (layout))
 506     {
 507       width = MAX (width, widget->allocation.width);
 508       height = MAX (height, widget->allocation.height);
 509       gdk_window_resize (layout->bin_window, width, height);
 510     }
 511 }
 512
 513 /**
 514  * gtk_layout_get_size:
 515  * @layout: a #GtkLayout
 516  * @width: location to store the width set on @layout, or %NULL
 517  * @height: location to store the height set on @layout, or %NULL
 518  *
 519  * Gets the size that has been set on the layout, and that determines
 520  * the total extents of the layout's scrollbar area. See
 521  * gtk_layout_set_size ().
 522  **/
 523 void
 524 gtk_layout_get_size (GtkLayout *layout,
 525                      guint     *width,
 526                      guint     *height)
 527 {
 528   g_return_if_fail (GTK_IS_LAYOUT (layout));
 529
 530   if (width)
 531     *width = layout->width;
 532   if (height)
 533     *height = layout->height;
 534 }
 535
 536 /**
 537  * gtk_layout_freeze:
 538  * @layout: a #GtkLayout
 539  *
 540  * This is a deprecated function, it doesn't do anything useful.
 541  **/
 542 void
 543 gtk_layout_freeze (GtkLayout *layout)
 544 {
 545   g_return_if_fail (GTK_IS_LAYOUT (layout));
 546
 547   layout->freeze_count++;
 548 }
 549
 550 /**
 551  * gtk_layout_thaw:
 552  * @layout: a #GtkLayout
 553  *
 554  * This is a deprecated function, it doesn't do anything useful.
 555  **/
 556 void
 557 gtk_layout_thaw (GtkLayout *layout)
 558 {
 559   g_return_if_fail (GTK_IS_LAYOUT (layout));
 560
 561   if (layout->freeze_count)
 562     {
 563       if (!(--layout->freeze_count))
 564         {
 565           gtk_widget_queue_draw (GTK_WIDGET (layout));
 566           gdk_window_process_updates (GTK_WIDGET (layout)->window, TRUE);
 567         }
 568     }
 569
 570 }
 571
 572 /* Basic Object handling procedures
 573  */
 574 static void
 575 gtk_layout_class_init (GtkLayoutClass *class)
 576 {
 577   GObjectClass *gobject_class;
 578   GtkWidgetClass *widget_class;
 579   GtkContainerClass *container_class;
 580
 581   gobject_class = (GObjectClass*) class;
 582   widget_class = (GtkWidgetClass*) class;
 583   container_class = (GtkContainerClass*) class;
 584
 585   gobject_class->set_property = gtk_layout_set_property;
 586   gobject_class->get_property = gtk_layout_get_property;
 587   gobject_class->finalize = gtk_layout_finalize;
 588   gobject_class->constructor = gtk_layout_constructor;
 589
 590   container_class->set_child_property = gtk_layout_set_child_property;
 591   container_class->get_child_property = gtk_layout_get_child_property;
 592
 593   gtk_container_class_install_child_property (container_class,
 594                                               CHILD_PROP_X,
 595                                               g_param_spec_int ("x",
 596                                                                 P_("X position"),
 597                                                                 P_("X position of child widget"),
 598                                                                 G_MININT,
 599                                                                 G_MAXINT,
 600                                                                 0,
 601                                                                 GTK_PARAM_READWRITE));
 602
 603   gtk_container_class_install_child_property (container_class,
 604                                               CHILD_PROP_Y,
 605                                               g_param_spec_int ("y",
 606                                                                 P_("Y position"),
 607                                                                 P_("Y position of child widget"),
 608                                                                 G_MININT,
 609                                                                 G_MAXINT,
 610                                                                 0,
 611                                                                 GTK_PARAM_READWRITE));
 612
 613   g_object_class_install_property (gobject_class,
 614                                    PROP_HADJUSTMENT,
 615                                    g_param_spec_object ("hadjustment",
 616                                                         P_("Horizontal adjustment"),
 617                                                         P_("The GtkAdjustment for the horizontal position"),
 618                                                         GTK_TYPE_ADJUSTMENT,
 619                                                         GTK_PARAM_READWRITE));
 620
 621   g_object_class_install_property (gobject_class,
 622                                    PROP_VADJUSTMENT,
 623                                    g_param_spec_object ("vadjustment",
 624                                                         P_("Vertical adjustment"),
 625                                                         P_("The GtkAdjustment for the vertical position"),
 626                                                         GTK_TYPE_ADJUSTMENT,
 627                                                         GTK_PARAM_READWRITE));
 628
 629   g_object_class_install_property (gobject_class,
 630                                    PROP_WIDTH,
 631                                    g_param_spec_uint ("width",
 632                                                      P_("Width"),
 633                                                      P_("The width of the layout"),
 634                                                      0,
 635                                                      G_MAXINT,
 636                                                      100,
 637                                                      GTK_PARAM_READWRITE));
 638   g_object_class_install_property (gobject_class,
 639                                    PROP_HEIGHT,
 640                                    g_param_spec_uint ("height",
 641                                                      P_("Height"),
 642                                                      P_("The height of the layout"),
 643                                                      0,
 644                                                      G_MAXINT,
 645                                                      100,
 646                                                      GTK_PARAM_READWRITE));
 647   widget_class->realize = gtk_layout_realize;
 648   widget_class->unrealize = gtk_layout_unrealize;
 649   widget_class->map = gtk_layout_map;
 650   widget_class->size_request = gtk_layout_size_request;
 651   widget_class->size_allocate = gtk_layout_size_allocate;
 652   widget_class->expose_event = gtk_layout_expose;
 653   widget_class->style_set = gtk_layout_style_set;
 654
 655   container_class->add = gtk_layout_add;
 656   container_class->remove = gtk_layout_remove;
 657   container_class->forall = gtk_layout_forall;
 658
 659   class->set_scroll_adjustments = gtk_layout_set_adjustments;
 660
 661   /**
 662    * GtkLayout::set-scroll-adjustments
 663    * @horizontal: the horizontal #GtkAdjustment
 664    * @vertical: the vertical #GtkAdjustment
 665    *
 666    * Set the scroll adjustments for the layout. Usually scrolled containers
 667    * like #GtkScrolledWindow will emit this signal to connect two instances
 668    * of #GtkScrollbar to the scroll directions of the #GtkLayout.
 669    */
 670   widget_class->set_scroll_adjustments_signal =
 671     g_signal_new (I_("set-scroll-adjustments"),
 672                   G_OBJECT_CLASS_TYPE (gobject_class),
 673                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 674                   G_STRUCT_OFFSET (GtkLayoutClass, set_scroll_adjustments),
 675                   NULL, NULL,
 676                   _gtk_marshal_VOID__OBJECT_OBJECT,
 677                   G_TYPE_NONE, 2,
 678                   GTK_TYPE_ADJUSTMENT,
 679                   GTK_TYPE_ADJUSTMENT);
 680 }
 681
 682 static void
 683 gtk_layout_get_property (GObject     *object,
 684                          guint        prop_id,
 685                          GValue      *value,
 686                          GParamSpec  *pspec)
 687 {
 688   GtkLayout *layout = GTK_LAYOUT (object);
 689
 690   switch (prop_id)
 691     {
 692     case PROP_HADJUSTMENT:
 693       g_value_set_object (value, layout->hadjustment);
 694       break;
 695     case PROP_VADJUSTMENT:
 696       g_value_set_object (value, layout->vadjustment);
 697       break;
 698     case PROP_WIDTH:
 699       g_value_set_uint (value, layout->width);
 700       break;
 701     case PROP_HEIGHT:
 702       g_value_set_uint (value, layout->height);
 703       break;
 704     default:
 705       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 706       break;
 707     }
 708 }
 709
 710 static void
 711 gtk_layout_set_property (GObject      *object,
 712                          guint         prop_id,
 713                          const GValue *value,
 714                          GParamSpec   *pspec)
 715 {
 716   GtkLayout *layout = GTK_LAYOUT (object);
 717
 718   switch (prop_id)
 719     {
 720     case PROP_HADJUSTMENT:
 721       gtk_layout_set_hadjustment (layout,
 722                                   (GtkAdjustment*) g_value_get_object (value));
 723       break;
 724     case PROP_VADJUSTMENT:
 725       gtk_layout_set_vadjustment (layout,
 726                                   (GtkAdjustment*) g_value_get_object (value));
 727       break;
 728     case PROP_WIDTH:
 729       gtk_layout_set_size (layout, g_value_get_uint (value),
 730                            layout->height);
 731       break;
 732     case PROP_HEIGHT:
 733       gtk_layout_set_size (layout, layout->width,
 734                            g_value_get_uint (value));
 735       break;
 736     default:
 737       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 738       break;
 739     }
 740 }
 741
 742 static void
 743 gtk_layout_set_child_property (GtkContainer    *container,
 744                                GtkWidget       *child,
 745                                guint            property_id,
 746                                const GValue    *value,
 747                                GParamSpec      *pspec)
 748 {
 749   switch (property_id)
 750     {
 751     case CHILD_PROP_X:
 752       gtk_layout_move_internal (GTK_LAYOUT (container),
 753                                 child,
 754                                 TRUE, g_value_get_int (value),
 755                                 FALSE, 0);
 756       break;
 757     case CHILD_PROP_Y:
 758       gtk_layout_move_internal (GTK_LAYOUT (container),
 759                                 child,
 760                                 FALSE, 0,
 761                                 TRUE, g_value_get_int (value));
 762       break;
 763     default:
 764       GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
 765       break;
 766     }
 767 }
 768
 769 static void
 770 gtk_layout_get_child_property (GtkContainer *container,
 771                                GtkWidget    *child,
 772                                guint         property_id,
 773                                GValue       *value,
 774                                GParamSpec   *pspec)
 775 {
 776   GtkLayoutChild *layout_child;
 777
 778   layout_child = get_child (GTK_LAYOUT (container), child);
 779
 780   switch (property_id)
 781     {
 782     case CHILD_PROP_X:
 783       g_value_set_int (value, layout_child->x);
 784       break;
 785     case CHILD_PROP_Y:
 786       g_value_set_int (value, layout_child->y);
 787       break;
 788     default:
 789       GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
 790       break;
 791     }
 792 }
 793
 794 static void
 795 gtk_layout_init (GtkLayout *layout)
 796 {
 797   layout->children = NULL;
 798
 799   layout->width = 100;
 800   layout->height = 100;
 801
 802   layout->hadjustment = NULL;
 803   layout->vadjustment = NULL;
 804
 805   layout->bin_window = NULL;
 806
 807   layout->scroll_x = 0;
 808   layout->scroll_y = 0;
 809   layout->visibility = GDK_VISIBILITY_PARTIAL;
 810
 811   layout->freeze_count = 0;
 812 }
 813
 814 static GObject *
 815 gtk_layout_constructor (GType                  type,
 816                         guint                  n_properties,
 817                         GObjectConstructParam *properties)
 818 {
 819   GtkLayout *layout;
 820   GObject *object;
 821   GtkAdjustment *hadj, *vadj;
 822
 823   object = G_OBJECT_CLASS (gtk_layout_parent_class)->constructor (type,
 824                                                                   n_properties,
 825                                                                   properties);
 826
 827   layout = GTK_LAYOUT (object);
 828
 829   hadj = layout->hadjustment ? layout->hadjustment : new_default_adjustment ();
 830   vadj = layout->vadjustment ? layout->vadjustment : new_default_adjustment ();
 831
 832   if (!layout->hadjustment || !layout->vadjustment)
 833     gtk_layout_set_adjustments (layout, hadj, vadj);
 834
 835   return object;
 836 }
 837
 838 /* Widget methods
 839  */
 840
 841 static void
 842 gtk_layout_realize (GtkWidget *widget)
 843 {
 844   GtkLayout *layout = GTK_LAYOUT (widget);
 845   GList *tmp_list;
 846   GdkWindowAttr attributes;
 847   gint attributes_mask;
 848
 849   GTK_WIDGET_SET_FLAGS (layout, GTK_REALIZED);
 850
 851   attributes.window_type = GDK_WINDOW_CHILD;
 852   attributes.x = widget->allocation.x;
 853   attributes.y = widget->allocation.y;
 854   attributes.width = widget->allocation.width;
 855   attributes.height = widget->allocation.height;
 856   attributes.wclass = GDK_INPUT_OUTPUT;
 857   attributes.visual = gtk_widget_get_visual (widget);
 858   attributes.colormap = gtk_widget_get_colormap (widget);
 859   attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;
 860
 861   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 862
 863   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 864                                    &attributes, attributes_mask);
 865   gdk_window_set_back_pixmap (widget->window, NULL, FALSE);
 866   gdk_window_set_user_data (widget->window, widget);
 867
 868   attributes.x = - layout->hadjustment->value,
 869   attributes.y = - layout->vadjustment->value;
 870   attributes.width = MAX (layout->width, widget->allocation.width);
 871   attributes.height = MAX (layout->height, widget->allocation.height);
 872   attributes.event_mask = GDK_EXPOSURE_MASK | GDK_SCROLL_MASK |
 873                           gtk_widget_get_events (widget);
 874
 875   layout->bin_window = gdk_window_new (widget->window,
 876                                         &attributes, attributes_mask);
 877   gdk_window_set_user_data (layout->bin_window, widget);
 878
 879   widget->style = gtk_style_attach (widget->style, widget->window);
 880   gtk_style_set_background (widget->style, layout->bin_window, GTK_STATE_NORMAL);
 881
 882   tmp_list = layout->children;
 883   while (tmp_list)
 884     {
 885       GtkLayoutChild *child = tmp_list->data;
 886       tmp_list = tmp_list->next;
 887
 888       gtk_widget_set_parent_window (child->widget, layout->bin_window);
 889     }
 890 }
 891
 892 static void
 893 gtk_layout_style_set (GtkWidget *widget,
 894                       GtkStyle  *old_style)
 895 {
 896   GTK_WIDGET_CLASS (gtk_layout_parent_class)->style_set (widget, old_style);
 897
 898   if (GTK_WIDGET_REALIZED (widget))
 899     {
 900       gtk_style_set_background (widget->style, GTK_LAYOUT (widget)->bin_window, GTK_STATE_NORMAL);
 901     }
 902 }
 903
 904 static void
 905 gtk_layout_map (GtkWidget *widget)
 906 {
 907   GtkLayout *layout = GTK_LAYOUT (widget);
 908   GList *tmp_list;
 909
 910   GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 911
 912   tmp_list = layout->children;
 913   while (tmp_list)
 914     {
 915       GtkLayoutChild *child = tmp_list->data;
 916       tmp_list = tmp_list->next;
 917
 918       if (GTK_WIDGET_VISIBLE (child->widget))
 919         {
 920           if (!GTK_WIDGET_MAPPED (child->widget))
 921             gtk_widget_map (child->widget);
 922         }
 923     }
 924
 925   gdk_window_show (layout->bin_window);
 926   gdk_window_show (widget->window);
 927 }
 928
 929 static void
 930 gtk_layout_unrealize (GtkWidget *widget)
 931 {
 932   GtkLayout *layout = GTK_LAYOUT (widget);
 933
 934   gdk_window_set_user_data (layout->bin_window, NULL);
 935   gdk_window_destroy (layout->bin_window);
 936   layout->bin_window = NULL;
 937
 938   GTK_WIDGET_CLASS (gtk_layout_parent_class)->unrealize (widget);
 939 }
 940
 941 static void
 942 gtk_layout_size_request (GtkWidget     *widget,
 943                          GtkRequisition *requisition)
 944 {
 945   GtkLayout *layout = GTK_LAYOUT (widget);
 946   GList *tmp_list;
 947
 948   requisition->width = 0;
 949   requisition->height = 0;
 950
 951   tmp_list = layout->children;
 952
 953   while (tmp_list)
 954     {
 955       GtkLayoutChild *child = tmp_list->data;
 956       GtkRequisition child_requisition;
 957
 958       tmp_list = tmp_list->next;
 959
 960       gtk_widget_size_request (child->widget, &child_requisition);
 961     }
 962 }
 963
 964 static void
 965 gtk_layout_size_allocate (GtkWidget     *widget,
 966                           GtkAllocation *allocation)
 967 {
 968   GtkLayout *layout = GTK_LAYOUT (widget);
 969   GList *tmp_list;
 970
 971   widget->allocation = *allocation;
 972
 973   tmp_list = layout->children;
 974
 975   while (tmp_list)
 976     {
 977       GtkLayoutChild *child = tmp_list->data;
 978       tmp_list = tmp_list->next;
 979
 980       gtk_layout_allocate_child (layout, child);
 981     }
 982
 983   if (GTK_WIDGET_REALIZED (widget))
 984     {
 985       gdk_window_move_resize (widget->window,
 986                               allocation->x, allocation->y,
 987                               allocation->width, allocation->height);
 988
 989       gdk_window_resize (layout->bin_window,
 990                          MAX (layout->width, allocation->width),
 991                          MAX (layout->height, allocation->height));
 992     }
 993
 994   layout->hadjustment->page_size = allocation->width;
 995   layout->hadjustment->page_increment = allocation->width * 0.9;
 996   layout->hadjustment->lower = 0;
 997   /* set_adjustment_upper() emits ::changed */
 998   gtk_layout_set_adjustment_upper (layout->hadjustment, MAX (allocation->width, layout->width), TRUE);
 999
1000   layout->vadjustment->page_size = allocation->height;
1001   layout->vadjustment->page_increment = allocation->height * 0.9;
1002   layout->vadjustment->lower = 0;
1003   layout->vadjustment->upper = MAX (allocation->height, layout->height);
1004   gtk_layout_set_adjustment_upper (layout->vadjustment, MAX (allocation->height, layout->height), TRUE);
1005 }
1006
1007 static gint
1008 gtk_layout_expose (GtkWidget      *widget,
1009                    GdkEventExpose *event)
1010 {
1011   GtkLayout *layout = GTK_LAYOUT (widget);
1012
1013   if (event->window != layout->bin_window)
1014     return FALSE;
1015
1016   GTK_WIDGET_CLASS (gtk_layout_parent_class)->expose_event (widget, event);
1017
1018   return FALSE;
1019 }
1020
1021 /* Container methods
1022  */
1023 static void
1024 gtk_layout_add (GtkContainer *container,
1025                 GtkWidget    *widget)
1026 {
1027   gtk_layout_put (GTK_LAYOUT (container), widget, 0, 0);
1028 }
1029
1030 static void
1031 gtk_layout_remove (GtkContainer *container,
1032                    GtkWidget    *widget)
1033 {
1034   GtkLayout *layout = GTK_LAYOUT (container);
1035   GList *tmp_list;
1036   GtkLayoutChild *child = NULL;
1037
1038   tmp_list = layout->children;
1039   while (tmp_list)
1040     {
1041       child = tmp_list->data;
1042       if (child->widget == widget)
1043         break;
1044       tmp_list = tmp_list->next;
1045     }
1046
1047   if (tmp_list)
1048     {
1049       gtk_widget_unparent (widget);
1050
1051       layout->children = g_list_remove_link (layout->children, tmp_list);
1052       g_list_free_1 (tmp_list);
1053       g_free (child);
1054     }
1055 }
1056
1057 static void
1058 gtk_layout_forall (GtkContainer *container,
1059                    gboolean      include_internals,
1060                    GtkCallback   callback,
1061                    gpointer      callback_data)
1062 {
1063   GtkLayout *layout = GTK_LAYOUT (container);
1064   GtkLayoutChild *child;
1065   GList *tmp_list;
1066
1067   tmp_list = layout->children;
1068   while (tmp_list)
1069     {
1070       child = tmp_list->data;
1071       tmp_list = tmp_list->next;
1072
1073       (* callback) (child->widget, callback_data);
1074     }
1075 }
1076
1077 /* Operations on children
1078  */
1079
1080 static void
1081 gtk_layout_allocate_child (GtkLayout      *layout,
1082                            GtkLayoutChild *child)
1083 {
1084   GtkAllocation allocation;
1085   GtkRequisition requisition;
1086
1087   allocation.x = child->x;
1088   allocation.y = child->y;
1089   gtk_widget_get_child_requisition (child->widget, &requisition);
1090   allocation.width = requisition.width;
1091   allocation.height = requisition.height;
1092
1093   gtk_widget_size_allocate (child->widget, &allocation);
1094 }
1095
1096 /* Callbacks */
1097
1098 static void
1099 gtk_layout_adjustment_changed (GtkAdjustment *adjustment,
1100                                GtkLayout     *layout)
1101 {
1102   if (layout->freeze_count)
1103     return;
1104
1105   if (GTK_WIDGET_REALIZED (layout))
1106     {
1107       gdk_window_move (layout->bin_window,
1108                        - layout->hadjustment->value,
1109                        - layout->vadjustment->value);
1110
1111       gdk_window_process_updates (layout->bin_window, TRUE);
1112     }
1113 }
1114
1115 #define __GTK_LAYOUT_C__
1116 #include "gtkaliasdef.c"