Pileus Git - ~andy/gtk/blob - gtk/gtklayout.c

   1 /* GTK - The GTK+ 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   widget_class->set_scroll_adjustments_signal =
 662     g_signal_new (I_("set_scroll_adjustments"),
 663                   G_OBJECT_CLASS_TYPE (gobject_class),
 664                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 665                   G_STRUCT_OFFSET (GtkLayoutClass, set_scroll_adjustments),
 666                   NULL, NULL,
 667                   _gtk_marshal_VOID__OBJECT_OBJECT,
 668                   G_TYPE_NONE, 2,
 669                   GTK_TYPE_ADJUSTMENT,
 670                   GTK_TYPE_ADJUSTMENT);
 671 }
 672
 673 static void
 674 gtk_layout_get_property (GObject     *object,
 675                          guint        prop_id,
 676                          GValue      *value,
 677                          GParamSpec  *pspec)
 678 {
 679   GtkLayout *layout = GTK_LAYOUT (object);
 680
 681   switch (prop_id)
 682     {
 683     case PROP_HADJUSTMENT:
 684       g_value_set_object (value, layout->hadjustment);
 685       break;
 686     case PROP_VADJUSTMENT:
 687       g_value_set_object (value, layout->vadjustment);
 688       break;
 689     case PROP_WIDTH:
 690       g_value_set_uint (value, layout->width);
 691       break;
 692     case PROP_HEIGHT:
 693       g_value_set_uint (value, layout->height);
 694       break;
 695     default:
 696       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 697       break;
 698     }
 699 }
 700
 701 static void
 702 gtk_layout_set_property (GObject      *object,
 703                          guint         prop_id,
 704                          const GValue *value,
 705                          GParamSpec   *pspec)
 706 {
 707   GtkLayout *layout = GTK_LAYOUT (object);
 708
 709   switch (prop_id)
 710     {
 711     case PROP_HADJUSTMENT:
 712       gtk_layout_set_hadjustment (layout,
 713                                   (GtkAdjustment*) g_value_get_object (value));
 714       break;
 715     case PROP_VADJUSTMENT:
 716       gtk_layout_set_vadjustment (layout,
 717                                   (GtkAdjustment*) g_value_get_object (value));
 718       break;
 719     case PROP_WIDTH:
 720       gtk_layout_set_size (layout, g_value_get_uint (value),
 721                            layout->height);
 722       break;
 723     case PROP_HEIGHT:
 724       gtk_layout_set_size (layout, layout->width,
 725                            g_value_get_uint (value));
 726       break;
 727     default:
 728       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 729       break;
 730     }
 731 }
 732
 733 static void
 734 gtk_layout_set_child_property (GtkContainer    *container,
 735                                GtkWidget       *child,
 736                                guint            property_id,
 737                                const GValue    *value,
 738                                GParamSpec      *pspec)
 739 {
 740   switch (property_id)
 741     {
 742     case CHILD_PROP_X:
 743       gtk_layout_move_internal (GTK_LAYOUT (container),
 744                                 child,
 745                                 TRUE, g_value_get_int (value),
 746                                 FALSE, 0);
 747       break;
 748     case CHILD_PROP_Y:
 749       gtk_layout_move_internal (GTK_LAYOUT (container),
 750                                 child,
 751                                 FALSE, 0,
 752                                 TRUE, g_value_get_int (value));
 753       break;
 754     default:
 755       GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
 756       break;
 757     }
 758 }
 759
 760 static void
 761 gtk_layout_get_child_property (GtkContainer *container,
 762                                GtkWidget    *child,
 763                                guint         property_id,
 764                                GValue       *value,
 765                                GParamSpec   *pspec)
 766 {
 767   GtkLayoutChild *layout_child;
 768
 769   layout_child = get_child (GTK_LAYOUT (container), child);
 770
 771   switch (property_id)
 772     {
 773     case CHILD_PROP_X:
 774       g_value_set_int (value, layout_child->x);
 775       break;
 776     case CHILD_PROP_Y:
 777       g_value_set_int (value, layout_child->y);
 778       break;
 779     default:
 780       GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
 781       break;
 782     }
 783 }
 784
 785 static void
 786 gtk_layout_init (GtkLayout *layout)
 787 {
 788   layout->children = NULL;
 789
 790   layout->width = 100;
 791   layout->height = 100;
 792
 793   layout->hadjustment = NULL;
 794   layout->vadjustment = NULL;
 795
 796   layout->bin_window = NULL;
 797
 798   layout->scroll_x = 0;
 799   layout->scroll_y = 0;
 800   layout->visibility = GDK_VISIBILITY_PARTIAL;
 801
 802   layout->freeze_count = 0;
 803 }
 804
 805 static GObject *
 806 gtk_layout_constructor (GType                  type,
 807                         guint                  n_properties,
 808                         GObjectConstructParam *properties)
 809 {
 810   GtkLayout *layout;
 811   GObject *object;
 812   GtkAdjustment *hadj, *vadj;
 813
 814   object = G_OBJECT_CLASS (gtk_layout_parent_class)->constructor (type,
 815                                                                   n_properties,
 816                                                                   properties);
 817
 818   layout = GTK_LAYOUT (object);
 819
 820   hadj = layout->hadjustment ? layout->hadjustment : new_default_adjustment ();
 821   vadj = layout->vadjustment ? layout->vadjustment : new_default_adjustment ();
 822
 823   if (!layout->hadjustment || !layout->vadjustment)
 824     gtk_layout_set_adjustments (layout, hadj, vadj);
 825
 826   return object;
 827 }
 828
 829 /* Widget methods
 830  */
 831
 832 static void
 833 gtk_layout_realize (GtkWidget *widget)
 834 {
 835   GtkLayout *layout = GTK_LAYOUT (widget);
 836   GList *tmp_list;
 837   GdkWindowAttr attributes;
 838   gint attributes_mask;
 839
 840   GTK_WIDGET_SET_FLAGS (layout, GTK_REALIZED);
 841
 842   attributes.window_type = GDK_WINDOW_CHILD;
 843   attributes.x = widget->allocation.x;
 844   attributes.y = widget->allocation.y;
 845   attributes.width = widget->allocation.width;
 846   attributes.height = widget->allocation.height;
 847   attributes.wclass = GDK_INPUT_OUTPUT;
 848   attributes.visual = gtk_widget_get_visual (widget);
 849   attributes.colormap = gtk_widget_get_colormap (widget);
 850   attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;
 851
 852   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 853
 854   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 855                                    &attributes, attributes_mask);
 856   gdk_window_set_back_pixmap (widget->window, NULL, FALSE);
 857   gdk_window_set_user_data (widget->window, widget);
 858
 859   attributes.x = - layout->hadjustment->value,
 860   attributes.y = - layout->vadjustment->value;
 861   attributes.width = MAX (layout->width, widget->allocation.width);
 862   attributes.height = MAX (layout->height, widget->allocation.height);
 863   attributes.event_mask = GDK_EXPOSURE_MASK | GDK_SCROLL_MASK |
 864                           gtk_widget_get_events (widget);
 865
 866   layout->bin_window = gdk_window_new (widget->window,
 867                                         &attributes, attributes_mask);
 868   gdk_window_set_user_data (layout->bin_window, widget);
 869
 870   widget->style = gtk_style_attach (widget->style, widget->window);
 871   gtk_style_set_background (widget->style, layout->bin_window, GTK_STATE_NORMAL);
 872
 873   tmp_list = layout->children;
 874   while (tmp_list)
 875     {
 876       GtkLayoutChild *child = tmp_list->data;
 877       tmp_list = tmp_list->next;
 878
 879       gtk_widget_set_parent_window (child->widget, layout->bin_window);
 880     }
 881 }
 882
 883 static void
 884 gtk_layout_style_set (GtkWidget *widget, GtkStyle *old_style)
 885 {
 886   if (GTK_WIDGET_CLASS (gtk_layout_parent_class)->style_set)
 887     (* GTK_WIDGET_CLASS (gtk_layout_parent_class)->style_set) (widget, old_style);
 888
 889   if (GTK_WIDGET_REALIZED (widget))
 890     {
 891       gtk_style_set_background (widget->style, GTK_LAYOUT (widget)->bin_window, GTK_STATE_NORMAL);
 892     }
 893 }
 894
 895 static void
 896 gtk_layout_map (GtkWidget *widget)
 897 {
 898   GtkLayout *layout = GTK_LAYOUT (widget);
 899   GList *tmp_list;
 900
 901   GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 902
 903   tmp_list = layout->children;
 904   while (tmp_list)
 905     {
 906       GtkLayoutChild *child = tmp_list->data;
 907       tmp_list = tmp_list->next;
 908
 909       if (GTK_WIDGET_VISIBLE (child->widget))
 910         {
 911           if (!GTK_WIDGET_MAPPED (child->widget))
 912             gtk_widget_map (child->widget);
 913         }
 914     }
 915
 916   gdk_window_show (layout->bin_window);
 917   gdk_window_show (widget->window);
 918 }
 919
 920 static void
 921 gtk_layout_unrealize (GtkWidget *widget)
 922 {
 923   GtkLayout *layout = GTK_LAYOUT (widget);
 924
 925   gdk_window_set_user_data (layout->bin_window, NULL);
 926   gdk_window_destroy (layout->bin_window);
 927   layout->bin_window = NULL;
 928
 929   if (GTK_WIDGET_CLASS (gtk_layout_parent_class)->unrealize)
 930     (* GTK_WIDGET_CLASS (gtk_layout_parent_class)->unrealize) (widget);
 931 }
 932
 933 static void
 934 gtk_layout_size_request (GtkWidget     *widget,
 935                          GtkRequisition *requisition)
 936 {
 937   GtkLayout *layout = GTK_LAYOUT (widget);
 938   GList *tmp_list;
 939
 940   requisition->width = 0;
 941   requisition->height = 0;
 942
 943   tmp_list = layout->children;
 944
 945   while (tmp_list)
 946     {
 947       GtkLayoutChild *child = tmp_list->data;
 948       GtkRequisition child_requisition;
 949
 950       tmp_list = tmp_list->next;
 951
 952       gtk_widget_size_request (child->widget, &child_requisition);
 953     }
 954 }
 955
 956 static void
 957 gtk_layout_size_allocate (GtkWidget     *widget,
 958                           GtkAllocation *allocation)
 959 {
 960   GtkLayout *layout = GTK_LAYOUT (widget);
 961   GList *tmp_list;
 962
 963   widget->allocation = *allocation;
 964
 965   tmp_list = layout->children;
 966
 967   while (tmp_list)
 968     {
 969       GtkLayoutChild *child = tmp_list->data;
 970       tmp_list = tmp_list->next;
 971
 972       gtk_layout_allocate_child (layout, child);
 973     }
 974
 975   if (GTK_WIDGET_REALIZED (widget))
 976     {
 977       gdk_window_move_resize (widget->window,
 978                               allocation->x, allocation->y,
 979                               allocation->width, allocation->height);
 980
 981       gdk_window_resize (layout->bin_window,
 982                          MAX (layout->width, allocation->width),
 983                          MAX (layout->height, allocation->height));
 984     }
 985
 986   layout->hadjustment->page_size = allocation->width;
 987   layout->hadjustment->page_increment = allocation->width * 0.9;
 988   layout->hadjustment->lower = 0;
 989   /* set_adjustment_upper() emits ::changed */
 990   gtk_layout_set_adjustment_upper (layout->hadjustment, MAX (allocation->width, layout->width), TRUE);
 991
 992   layout->vadjustment->page_size = allocation->height;
 993   layout->vadjustment->page_increment = allocation->height * 0.9;
 994   layout->vadjustment->lower = 0;
 995   layout->vadjustment->upper = MAX (allocation->height, layout->height);
 996   gtk_layout_set_adjustment_upper (layout->vadjustment, MAX (allocation->height, layout->height), TRUE);
 997 }
 998
 999 static gint
1000 gtk_layout_expose (GtkWidget      *widget,
1001                    GdkEventExpose *event)
1002 {
1003   GtkLayout *layout = GTK_LAYOUT (widget);
1004
1005   if (event->window != layout->bin_window)
1006     return FALSE;
1007
1008   (* GTK_WIDGET_CLASS (gtk_layout_parent_class)->expose_event) (widget, event);
1009
1010   return FALSE;
1011 }
1012
1013 /* Container methods
1014  */
1015 static void
1016 gtk_layout_add (GtkContainer *container,
1017                 GtkWidget    *widget)
1018 {
1019   gtk_layout_put (GTK_LAYOUT (container), widget, 0, 0);
1020 }
1021
1022 static void
1023 gtk_layout_remove (GtkContainer *container,
1024                    GtkWidget    *widget)
1025 {
1026   GtkLayout *layout = GTK_LAYOUT (container);
1027   GList *tmp_list;
1028   GtkLayoutChild *child = NULL;
1029
1030   tmp_list = layout->children;
1031   while (tmp_list)
1032     {
1033       child = tmp_list->data;
1034       if (child->widget == widget)
1035         break;
1036       tmp_list = tmp_list->next;
1037     }
1038
1039   if (tmp_list)
1040     {
1041       gtk_widget_unparent (widget);
1042
1043       layout->children = g_list_remove_link (layout->children, tmp_list);
1044       g_list_free_1 (tmp_list);
1045       g_free (child);
1046     }
1047 }
1048
1049 static void
1050 gtk_layout_forall (GtkContainer *container,
1051                    gboolean      include_internals,
1052                    GtkCallback   callback,
1053                    gpointer      callback_data)
1054 {
1055   GtkLayout *layout = GTK_LAYOUT (container);
1056   GtkLayoutChild *child;
1057   GList *tmp_list;
1058
1059   tmp_list = layout->children;
1060   while (tmp_list)
1061     {
1062       child = tmp_list->data;
1063       tmp_list = tmp_list->next;
1064
1065       (* callback) (child->widget, callback_data);
1066     }
1067 }
1068
1069 /* Operations on children
1070  */
1071
1072 static void
1073 gtk_layout_allocate_child (GtkLayout      *layout,
1074                            GtkLayoutChild *child)
1075 {
1076   GtkAllocation allocation;
1077   GtkRequisition requisition;
1078
1079   allocation.x = child->x;
1080   allocation.y = child->y;
1081   gtk_widget_get_child_requisition (child->widget, &requisition);
1082   allocation.width = requisition.width;
1083   allocation.height = requisition.height;
1084
1085   gtk_widget_size_allocate (child->widget, &allocation);
1086 }
1087
1088 /* Callbacks */
1089
1090 static void
1091 gtk_layout_adjustment_changed (GtkAdjustment *adjustment,
1092                                GtkLayout     *layout)
1093 {
1094   if (layout->freeze_count)
1095     return;
1096
1097   if (GTK_WIDGET_REALIZED (layout))
1098     {
1099       gdk_window_move (layout->bin_window,
1100                        - layout->hadjustment->value,
1101                        - layout->vadjustment->value);
1102
1103       gdk_window_process_updates (layout->bin_window, TRUE);
1104     }
1105 }
1106
1107 #define __GTK_LAYOUT_C__
1108 #include "gtkaliasdef.c"