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
  33 #include "gtklayout.h"
  34
  35 #include "gdk/gdk.h"
  36
  37 #include "gtkprivate.h"
  38 #include "gtkintl.h"
  39 #include "gtkmarshalers.h"
  40 #include "gtkscrollable.h"
  41
  42
  43 /**
  44  * SECTION:gtklayout
  45  * @Short_description: Infinite scrollable area containing child widgets
  46  *   and/or custom drawing
  47  * @Title: GtkLayout
  48  * @See_also: #GtkDrawingArea, #GtkScrolledWindow
  49  *
  50  * #GtkLayout is similar to #GtkDrawingArea in that it's a "blank slate"
  51  * and doesn't do anything but paint a blank background by default. It's
  52  * different in that it supports scrolling natively (you can add it to a
  53  * #GtkScrolledWindow), and it can contain child widgets, since it's a
  54  * #GtkContainer. However if you're just going to draw, a #GtkDrawingArea
  55  * is a better choice since it has lower overhead.
  56  *
  57  * When handling expose events on a #GtkLayout, you must draw to
  58  * GTK_LAYOUT (layout)->bin_window, rather than to
  59  * GTK_WIDGET (layout)->window, as you would for a drawing
  60  * area.
  61  */
  62
  63
  64 typedef struct _GtkLayoutChild   GtkLayoutChild;
  65
  66 struct _GtkLayoutPrivate
  67 {
  68   /* Properties */
  69   guint width;
  70   guint height;
  71
  72   GtkAdjustment *hadjustment;
  73   GtkAdjustment *vadjustment;
  74
  75   /* GtkScrollablePolicy needs to be checked when
  76    * driving the scrollable adjustment values */
  77   guint hscroll_policy : 1;
  78   guint vscroll_policy : 1;
  79
  80   /* Properties */
  81
  82   GdkVisibilityState visibility;
  83   GdkWindow *bin_window;
  84
  85   GList *children;
  86
  87   gint scroll_x;
  88   gint scroll_y;
  89
  90   guint freeze_count;
  91 };
  92
  93 struct _GtkLayoutChild {
  94   GtkWidget *widget;
  95   gint x;
  96   gint y;
  97 };
  98
  99 enum {
 100    PROP_0,
 101    PROP_HADJUSTMENT,
 102    PROP_VADJUSTMENT,
 103    PROP_HSCROLL_POLICY,
 104    PROP_VSCROLL_POLICY,
 105    PROP_WIDTH,
 106    PROP_HEIGHT
 107 };
 108
 109 enum {
 110   CHILD_PROP_0,
 111   CHILD_PROP_X,
 112   CHILD_PROP_Y
 113 };
 114
 115 static void gtk_layout_get_property       (GObject        *object,
 116                                            guint           prop_id,
 117                                            GValue         *value,
 118                                            GParamSpec     *pspec);
 119 static void gtk_layout_set_property       (GObject        *object,
 120                                            guint           prop_id,
 121                                            const GValue   *value,
 122                                            GParamSpec     *pspec);
 123 static void gtk_layout_finalize           (GObject        *object);
 124 static void gtk_layout_realize            (GtkWidget      *widget);
 125 static void gtk_layout_unrealize          (GtkWidget      *widget);
 126 static void gtk_layout_map                (GtkWidget      *widget);
 127 static void gtk_layout_get_preferred_width  (GtkWidget     *widget,
 128                                              gint          *minimum,
 129                                              gint          *natural);
 130 static void gtk_layout_get_preferred_height (GtkWidget     *widget,
 131                                              gint          *minimum,
 132                                              gint          *natural);
 133 static void gtk_layout_size_allocate      (GtkWidget      *widget,
 134                                            GtkAllocation  *allocation);
 135 static gint gtk_layout_draw               (GtkWidget      *widget,
 136                                            cairo_t        *cr);
 137 static void gtk_layout_add                (GtkContainer   *container,
 138                                            GtkWidget      *widget);
 139 static void gtk_layout_remove             (GtkContainer   *container,
 140                                            GtkWidget      *widget);
 141 static void gtk_layout_forall             (GtkContainer   *container,
 142                                            gboolean        include_internals,
 143                                            GtkCallback     callback,
 144                                            gpointer        callback_data);
 145 static void gtk_layout_set_child_property (GtkContainer   *container,
 146                                            GtkWidget      *child,
 147                                            guint           property_id,
 148                                            const GValue   *value,
 149                                            GParamSpec     *pspec);
 150 static void gtk_layout_get_child_property (GtkContainer   *container,
 151                                            GtkWidget      *child,
 152                                            guint           property_id,
 153                                            GValue         *value,
 154                                            GParamSpec     *pspec);
 155 static void gtk_layout_allocate_child     (GtkLayout      *layout,
 156                                            GtkLayoutChild *child);
 157 static void gtk_layout_adjustment_changed (GtkAdjustment  *adjustment,
 158                                            GtkLayout      *layout);
 159 static void gtk_layout_style_updated      (GtkWidget      *widget);
 160
 161 static void gtk_layout_set_hadjustment_values (GtkLayout      *layout);
 162 static void gtk_layout_set_vadjustment_values (GtkLayout      *layout);
 163
 164 G_DEFINE_TYPE_WITH_CODE (GtkLayout, gtk_layout, GTK_TYPE_CONTAINER,
 165                          G_IMPLEMENT_INTERFACE (GTK_TYPE_SCROLLABLE, NULL))
 166
 167 /* Public interface
 168  */
 169 /**
 170  * gtk_layout_new:
 171  * @hadjustment: (allow-none): horizontal scroll adjustment, or %NULL
 172  * @vadjustment: (allow-none): vertical scroll adjustment, or %NULL
 173  *
 174  * Creates a new #GtkLayout. Unless you have a specific adjustment
 175  * you'd like the layout to use for scrolling, pass %NULL for
 176  * @hadjustment and @vadjustment.
 177  *
 178  * Return value: a new #GtkLayout
 179  **/
 180
 181 GtkWidget*
 182 gtk_layout_new (GtkAdjustment *hadjustment,
 183                 GtkAdjustment *vadjustment)
 184 {
 185   GtkLayout *layout;
 186
 187   layout = g_object_new (GTK_TYPE_LAYOUT,
 188                          "hadjustment", hadjustment,
 189                          "vadjustment", vadjustment,
 190                          NULL);
 191
 192   return GTK_WIDGET (layout);
 193 }
 194
 195 /**
 196  * gtk_layout_get_bin_window:
 197  * @layout: a #GtkLayout
 198  *
 199  * Retrieve the bin window of the layout used for drawing operations.
 200  *
 201  * Return value: (transfer none): a #GdkWindow
 202  *
 203  * Since: 2.14
 204  **/
 205 GdkWindow*
 206 gtk_layout_get_bin_window (GtkLayout *layout)
 207 {
 208   g_return_val_if_fail (GTK_IS_LAYOUT (layout), NULL);
 209
 210   return layout->priv->bin_window;
 211 }
 212
 213 /**
 214  * gtk_layout_get_hadjustment:
 215  * @layout: a #GtkLayout
 216  *
 217  * This function should only be called after the layout has been
 218  * placed in a #GtkScrolledWindow or otherwise configured for
 219  * scrolling. It returns the #GtkAdjustment used for communication
 220  * between the horizontal scrollbar and @layout.
 221  *
 222  * See #GtkScrolledWindow, #GtkScrollbar, #GtkAdjustment for details.
 223  *
 224  * Return value: (transfer none): horizontal scroll adjustment
 225  *
 226  * Deprecated: 3.0: Use gtk_scrollable_get_hadjustment()
 227  **/
 228 GtkAdjustment*
 229 gtk_layout_get_hadjustment (GtkLayout *layout)
 230 {
 231   g_return_val_if_fail (GTK_IS_LAYOUT (layout), NULL);
 232
 233   return layout->priv->hadjustment;
 234 }
 235 /**
 236  * gtk_layout_get_vadjustment:
 237  * @layout: a #GtkLayout
 238  *
 239  * This function should only be called after the layout has been
 240  * placed in a #GtkScrolledWindow or otherwise configured for
 241  * scrolling. It returns the #GtkAdjustment used for communication
 242  * between the vertical scrollbar and @layout.
 243  *
 244  * See #GtkScrolledWindow, #GtkScrollbar, #GtkAdjustment for details.
 245  *
 246  * Return value: (transfer none): vertical scroll adjustment
 247  *
 248  * Deprecated: 3.0: Use gtk_scrollable_get_vadjustment()
 249  **/
 250 GtkAdjustment*
 251 gtk_layout_get_vadjustment (GtkLayout *layout)
 252 {
 253   g_return_val_if_fail (GTK_IS_LAYOUT (layout), NULL);
 254
 255   return layout->priv->vadjustment;
 256 }
 257
 258 static void
 259 gtk_layout_set_hadjustment_values (GtkLayout *layout)
 260 {
 261   GtkLayoutPrivate *priv = layout->priv;
 262   GtkAllocation  allocation;
 263   GtkAdjustment *adj = priv->hadjustment;
 264   gdouble old_value;
 265   gdouble new_value;
 266   gdouble new_upper;
 267
 268   gtk_widget_get_allocation (GTK_WIDGET (layout), &allocation);
 269
 270   old_value = gtk_adjustment_get_value (adj);
 271   new_upper = MAX (allocation.width, priv->width);
 272
 273   g_object_set (adj,
 274                 "lower", 0.0,
 275                 "upper", new_upper,
 276                 "page-size", (gdouble)allocation.width,
 277                 "step-increment", allocation.width * 0.1,
 278                 "page-increment", allocation.width * 0.9,
 279                 NULL);
 280
 281   new_value = CLAMP (old_value, 0, new_upper - allocation.width);
 282   if (new_value != old_value)
 283     gtk_adjustment_set_value (adj, new_value);
 284 }
 285
 286 static void
 287 gtk_layout_set_vadjustment_values (GtkLayout *layout)
 288 {
 289   GtkAllocation  allocation;
 290   GtkAdjustment *adj = layout->priv->vadjustment;
 291   gdouble old_value;
 292   gdouble new_value;
 293   gdouble new_upper;
 294
 295   gtk_widget_get_allocation (GTK_WIDGET (layout), &allocation);
 296
 297   old_value = gtk_adjustment_get_value (adj);
 298   new_upper = MAX (allocation.height, layout->priv->height);
 299
 300   g_object_set (adj,
 301                 "lower", 0.0,
 302                 "upper", new_upper,
 303                 "page-size", (gdouble)allocation.height,
 304                 "step-increment", allocation.height * 0.1,
 305                 "page-increment", allocation.height * 0.9,
 306                 NULL);
 307
 308   new_value = CLAMP (old_value, 0, new_upper - allocation.height);
 309   if (new_value != old_value)
 310     gtk_adjustment_set_value (adj, new_value);
 311 }
 312
 313 static void
 314 gtk_layout_finalize (GObject *object)
 315 {
 316   GtkLayout *layout = GTK_LAYOUT (object);
 317   GtkLayoutPrivate *priv = layout->priv;
 318
 319   g_object_unref (priv->hadjustment);
 320   g_object_unref (priv->vadjustment);
 321
 322   G_OBJECT_CLASS (gtk_layout_parent_class)->finalize (object);
 323 }
 324
 325 /**
 326  * gtk_layout_set_hadjustment:
 327  * @layout: a #GtkLayout
 328  * @adjustment: (allow-none): new scroll adjustment
 329  *
 330  * Sets the horizontal scroll adjustment for the layout.
 331  *
 332  * See #GtkScrolledWindow, #GtkScrollbar, #GtkAdjustment for details.
 333  *
 334  * Deprecated: 3.0: Use gtk_scrollable_set_hadjustment()
 335  **/
 336 void
 337 gtk_layout_set_hadjustment (GtkLayout     *layout,
 338                             GtkAdjustment *adjustment)
 339 {
 340   GtkLayoutPrivate *priv;
 341
 342   g_return_if_fail (GTK_IS_LAYOUT (layout));
 343   g_return_if_fail (adjustment == NULL || GTK_IS_ADJUSTMENT (adjustment));
 344
 345   priv = layout->priv;
 346
 347   if (adjustment && priv->hadjustment == adjustment)
 348         return;
 349
 350   if (priv->hadjustment != NULL)
 351     {
 352       g_signal_handlers_disconnect_by_func (priv->hadjustment,
 353                                             gtk_layout_adjustment_changed,
 354                                             layout);
 355       g_object_unref (priv->hadjustment);
 356     }
 357
 358   if (adjustment == NULL)
 359     adjustment = gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
 360
 361   g_signal_connect (adjustment, "value-changed",
 362                     G_CALLBACK (gtk_layout_adjustment_changed), layout);
 363   priv->hadjustment = g_object_ref_sink (adjustment);
 364   gtk_layout_set_hadjustment_values (layout);
 365
 366   g_object_notify (G_OBJECT (layout), "hadjustment");
 367 }
 368
 369
 370 /**
 371  * gtk_layout_set_vadjustment:
 372  * @layout: a #GtkLayout
 373  * @adjustment: (allow-none): new scroll adjustment
 374  *
 375  * Sets the vertical scroll adjustment for the layout.
 376  *
 377  * See #GtkScrolledWindow, #GtkScrollbar, #GtkAdjustment for details.
 378  *
 379  * Deprecated: 3.0: Use gtk_scrollable_set_vadjustment()
 380  **/
 381 void
 382 gtk_layout_set_vadjustment (GtkLayout     *layout,
 383                             GtkAdjustment *adjustment)
 384 {
 385   GtkLayoutPrivate *priv;
 386
 387   g_return_if_fail (GTK_IS_LAYOUT (layout));
 388   g_return_if_fail (adjustment == NULL || GTK_IS_ADJUSTMENT (adjustment));
 389
 390   priv = layout->priv;
 391
 392   if (adjustment && priv->vadjustment == adjustment)
 393         return;
 394
 395   if (priv->vadjustment != NULL)
 396     {
 397       g_signal_handlers_disconnect_by_func (priv->vadjustment,
 398                                             gtk_layout_adjustment_changed,
 399                                             layout);
 400       g_object_unref (priv->vadjustment);
 401     }
 402
 403   if (adjustment == NULL)
 404     adjustment = gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
 405
 406   g_signal_connect (adjustment, "value-changed",
 407                     G_CALLBACK (gtk_layout_adjustment_changed), layout);
 408   priv->vadjustment = g_object_ref_sink (adjustment);
 409   gtk_layout_set_vadjustment_values (layout);
 410
 411   g_object_notify (G_OBJECT (layout), "vadjustment");
 412 }
 413
 414 static GtkLayoutChild*
 415 get_child (GtkLayout  *layout,
 416            GtkWidget  *widget)
 417 {
 418   GtkLayoutPrivate *priv = layout->priv;
 419   GList *children;
 420
 421   children = priv->children;
 422   while (children)
 423     {
 424       GtkLayoutChild *child;
 425
 426       child = children->data;
 427       children = children->next;
 428
 429       if (child->widget == widget)
 430         return child;
 431     }
 432
 433   return NULL;
 434 }
 435
 436 /**
 437  * gtk_layout_put:
 438  * @layout: a #GtkLayout
 439  * @child_widget: child widget
 440  * @x: X position of child widget
 441  * @y: Y position of child widget
 442  *
 443  * Adds @child_widget to @layout, at position (@x,@y).
 444  * @layout becomes the new parent container of @child_widget.
 445  *
 446  **/
 447 void
 448 gtk_layout_put (GtkLayout     *layout,
 449                 GtkWidget     *child_widget,
 450                 gint           x,
 451                 gint           y)
 452 {
 453   GtkLayoutPrivate *priv;
 454   GtkLayoutChild *child;
 455
 456   g_return_if_fail (GTK_IS_LAYOUT (layout));
 457   g_return_if_fail (GTK_IS_WIDGET (child_widget));
 458
 459   priv = layout->priv;
 460
 461   child = g_new (GtkLayoutChild, 1);
 462
 463   child->widget = child_widget;
 464   child->x = x;
 465   child->y = y;
 466
 467   priv->children = g_list_append (priv->children, child);
 468
 469   if (gtk_widget_get_realized (GTK_WIDGET (layout)))
 470     gtk_widget_set_parent_window (child->widget, priv->bin_window);
 471
 472   gtk_widget_set_parent (child_widget, GTK_WIDGET (layout));
 473 }
 474
 475 static void
 476 gtk_layout_move_internal (GtkLayout       *layout,
 477                           GtkWidget       *widget,
 478                           gboolean         change_x,
 479                           gint             x,
 480                           gboolean         change_y,
 481                           gint             y)
 482 {
 483   GtkLayoutChild *child;
 484
 485   child = get_child (layout, widget);
 486
 487   g_assert (child);
 488
 489   gtk_widget_freeze_child_notify (widget);
 490
 491   if (change_x)
 492     {
 493       child->x = x;
 494       gtk_widget_child_notify (widget, "x");
 495     }
 496
 497   if (change_y)
 498     {
 499       child->y = y;
 500       gtk_widget_child_notify (widget, "y");
 501     }
 502
 503   gtk_widget_thaw_child_notify (widget);
 504
 505   if (gtk_widget_get_visible (widget) &&
 506       gtk_widget_get_visible (GTK_WIDGET (layout)))
 507     gtk_widget_queue_resize (widget);
 508 }
 509
 510 /**
 511  * gtk_layout_move:
 512  * @layout: a #GtkLayout
 513  * @child_widget: a current child of @layout
 514  * @x: X position to move to
 515  * @y: Y position to move to
 516  *
 517  * Moves a current child of @layout to a new position.
 518  *
 519  **/
 520 void
 521 gtk_layout_move (GtkLayout     *layout,
 522                  GtkWidget     *child_widget,
 523                  gint           x,
 524                  gint           y)
 525 {
 526   g_return_if_fail (GTK_IS_LAYOUT (layout));
 527   g_return_if_fail (GTK_IS_WIDGET (child_widget));
 528   g_return_if_fail (gtk_widget_get_parent (child_widget) == GTK_WIDGET (layout));
 529
 530   gtk_layout_move_internal (layout, child_widget, TRUE, x, TRUE, y);
 531 }
 532
 533 /**
 534  * gtk_layout_set_size:
 535  * @layout: a #GtkLayout
 536  * @width: width of entire scrollable area
 537  * @height: height of entire scrollable area
 538  *
 539  * Sets the size of the scrollable area of the layout.
 540  *
 541  **/
 542 void
 543 gtk_layout_set_size (GtkLayout     *layout,
 544                      guint          width,
 545                      guint          height)
 546 {
 547   GtkLayoutPrivate *priv;
 548   GtkWidget *widget;
 549
 550   g_return_if_fail (GTK_IS_LAYOUT (layout));
 551
 552   priv = layout->priv;
 553   widget = GTK_WIDGET (layout);
 554
 555   g_object_freeze_notify (G_OBJECT (layout));
 556   if (width != priv->width)
 557      {
 558         priv->width = width;
 559         g_object_notify (G_OBJECT (layout), "width");
 560      }
 561   if (height != priv->height)
 562      {
 563         priv->height = height;
 564         g_object_notify (G_OBJECT (layout), "height");
 565      }
 566   g_object_thaw_notify (G_OBJECT (layout));
 567
 568   if (gtk_widget_get_realized (widget))
 569     {
 570       GtkAllocation allocation;
 571
 572       gtk_widget_get_allocation (widget, &allocation);
 573       width = MAX (width, allocation.width);
 574       height = MAX (height, allocation.height);
 575       gdk_window_resize (priv->bin_window, width, height);
 576     }
 577
 578   gtk_layout_set_hadjustment_values (layout);
 579   gtk_layout_set_vadjustment_values (layout);
 580 }
 581
 582 /**
 583  * gtk_layout_get_size:
 584  * @layout: a #GtkLayout
 585  * @width: (allow-none): location to store the width set on @layout, or %NULL
 586  * @height: (allow-none): location to store the height set on @layout, or %NULL
 587  *
 588  * Gets the size that has been set on the layout, and that determines
 589  * the total extents of the layout's scrollbar area. See
 590  * gtk_layout_set_size ().
 591  **/
 592 void
 593 gtk_layout_get_size (GtkLayout *layout,
 594                      guint     *width,
 595                      guint     *height)
 596 {
 597   GtkLayoutPrivate *priv;
 598
 599   g_return_if_fail (GTK_IS_LAYOUT (layout));
 600
 601   priv = layout->priv;
 602
 603   if (width)
 604     *width = priv->width;
 605   if (height)
 606     *height = priv->height;
 607 }
 608
 609 /* Basic Object handling procedures
 610  */
 611 static void
 612 gtk_layout_class_init (GtkLayoutClass *class)
 613 {
 614   GObjectClass *gobject_class;
 615   GtkWidgetClass *widget_class;
 616   GtkContainerClass *container_class;
 617
 618   gobject_class = (GObjectClass*) class;
 619   widget_class = (GtkWidgetClass*) class;
 620   container_class = (GtkContainerClass*) class;
 621
 622   gobject_class->set_property = gtk_layout_set_property;
 623   gobject_class->get_property = gtk_layout_get_property;
 624   gobject_class->finalize = gtk_layout_finalize;
 625
 626   container_class->set_child_property = gtk_layout_set_child_property;
 627   container_class->get_child_property = gtk_layout_get_child_property;
 628
 629   gtk_container_class_install_child_property (container_class,
 630                                               CHILD_PROP_X,
 631                                               g_param_spec_int ("x",
 632                                                                 P_("X position"),
 633                                                                 P_("X position of child widget"),
 634                                                                 G_MININT,
 635                                                                 G_MAXINT,
 636                                                                 0,
 637                                                                 GTK_PARAM_READWRITE));
 638
 639   gtk_container_class_install_child_property (container_class,
 640                                               CHILD_PROP_Y,
 641                                               g_param_spec_int ("y",
 642                                                                 P_("Y position"),
 643                                                                 P_("Y position of child widget"),
 644                                                                 G_MININT,
 645                                                                 G_MAXINT,
 646                                                                 0,
 647                                                                 GTK_PARAM_READWRITE));
 648
 649   /* Scrollable interface */
 650   g_object_class_override_property (gobject_class, PROP_HADJUSTMENT,    "hadjustment");
 651   g_object_class_override_property (gobject_class, PROP_VADJUSTMENT,    "vadjustment");
 652   g_object_class_override_property (gobject_class, PROP_HSCROLL_POLICY, "hscroll-policy");
 653   g_object_class_override_property (gobject_class, PROP_VSCROLL_POLICY, "vscroll-policy");
 654
 655   g_object_class_install_property (gobject_class,
 656                                    PROP_WIDTH,
 657                                    g_param_spec_uint ("width",
 658                                                      P_("Width"),
 659                                                      P_("The width of the layout"),
 660                                                      0,
 661                                                      G_MAXINT,
 662                                                      100,
 663                                                      GTK_PARAM_READWRITE));
 664   g_object_class_install_property (gobject_class,
 665                                    PROP_HEIGHT,
 666                                    g_param_spec_uint ("height",
 667                                                      P_("Height"),
 668                                                      P_("The height of the layout"),
 669                                                      0,
 670                                                      G_MAXINT,
 671                                                      100,
 672                                                      GTK_PARAM_READWRITE));
 673   widget_class->realize = gtk_layout_realize;
 674   widget_class->unrealize = gtk_layout_unrealize;
 675   widget_class->map = gtk_layout_map;
 676   widget_class->get_preferred_width = gtk_layout_get_preferred_width;
 677   widget_class->get_preferred_height = gtk_layout_get_preferred_height;
 678   widget_class->size_allocate = gtk_layout_size_allocate;
 679   widget_class->draw = gtk_layout_draw;
 680   widget_class->style_updated = gtk_layout_style_updated;
 681
 682   container_class->add = gtk_layout_add;
 683   container_class->remove = gtk_layout_remove;
 684   container_class->forall = gtk_layout_forall;
 685
 686   g_type_class_add_private (class, sizeof (GtkLayoutPrivate));
 687 }
 688
 689 static void
 690 gtk_layout_get_property (GObject     *object,
 691                          guint        prop_id,
 692                          GValue      *value,
 693                          GParamSpec  *pspec)
 694 {
 695   GtkLayout *layout = GTK_LAYOUT (object);
 696   GtkLayoutPrivate *priv = layout->priv;
 697
 698   switch (prop_id)
 699     {
 700     case PROP_HADJUSTMENT:
 701       g_value_set_object (value, priv->hadjustment);
 702       break;
 703     case PROP_VADJUSTMENT:
 704       g_value_set_object (value, priv->vadjustment);
 705       break;
 706     case PROP_HSCROLL_POLICY:
 707       g_value_set_enum (value, priv->hscroll_policy);
 708       break;
 709     case PROP_VSCROLL_POLICY:
 710       g_value_set_enum (value, priv->vscroll_policy);
 711       break;
 712     case PROP_WIDTH:
 713       g_value_set_uint (value, priv->width);
 714       break;
 715     case PROP_HEIGHT:
 716       g_value_set_uint (value, priv->height);
 717       break;
 718     default:
 719       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 720       break;
 721     }
 722 }
 723
 724 static void
 725 gtk_layout_set_property (GObject      *object,
 726                          guint         prop_id,
 727                          const GValue *value,
 728                          GParamSpec   *pspec)
 729 {
 730   GtkLayout *layout = GTK_LAYOUT (object);
 731   GtkLayoutPrivate *priv = layout->priv;
 732
 733   switch (prop_id)
 734     {
 735     case PROP_HADJUSTMENT:
 736       gtk_layout_set_hadjustment (layout,
 737                                   (GtkAdjustment*) g_value_get_object (value));
 738       break;
 739     case PROP_VADJUSTMENT:
 740       gtk_layout_set_vadjustment (layout,
 741                                   (GtkAdjustment*) g_value_get_object (value));
 742       break;
 743     case PROP_HSCROLL_POLICY:
 744       priv->hscroll_policy = g_value_get_enum (value);
 745       gtk_widget_queue_resize (GTK_WIDGET (layout));
 746       break;
 747     case PROP_VSCROLL_POLICY:
 748       priv->vscroll_policy = g_value_get_enum (value);
 749       gtk_widget_queue_resize (GTK_WIDGET (layout));
 750       break;
 751     case PROP_WIDTH:
 752       gtk_layout_set_size (layout, g_value_get_uint (value),
 753                            priv->height);
 754       break;
 755     case PROP_HEIGHT:
 756       gtk_layout_set_size (layout, priv->width,
 757                            g_value_get_uint (value));
 758       break;
 759     default:
 760       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 761       break;
 762     }
 763 }
 764
 765 static void
 766 gtk_layout_set_child_property (GtkContainer    *container,
 767                                GtkWidget       *child,
 768                                guint            property_id,
 769                                const GValue    *value,
 770                                GParamSpec      *pspec)
 771 {
 772   switch (property_id)
 773     {
 774     case CHILD_PROP_X:
 775       gtk_layout_move_internal (GTK_LAYOUT (container),
 776                                 child,
 777                                 TRUE, g_value_get_int (value),
 778                                 FALSE, 0);
 779       break;
 780     case CHILD_PROP_Y:
 781       gtk_layout_move_internal (GTK_LAYOUT (container),
 782                                 child,
 783                                 FALSE, 0,
 784                                 TRUE, g_value_get_int (value));
 785       break;
 786     default:
 787       GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
 788       break;
 789     }
 790 }
 791
 792 static void
 793 gtk_layout_get_child_property (GtkContainer *container,
 794                                GtkWidget    *child,
 795                                guint         property_id,
 796                                GValue       *value,
 797                                GParamSpec   *pspec)
 798 {
 799   GtkLayoutChild *layout_child;
 800
 801   layout_child = get_child (GTK_LAYOUT (container), child);
 802
 803   switch (property_id)
 804     {
 805     case CHILD_PROP_X:
 806       g_value_set_int (value, layout_child->x);
 807       break;
 808     case CHILD_PROP_Y:
 809       g_value_set_int (value, layout_child->y);
 810       break;
 811     default:
 812       GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
 813       break;
 814     }
 815 }
 816
 817 static void
 818 gtk_layout_init (GtkLayout *layout)
 819 {
 820   GtkLayoutPrivate *priv;
 821
 822   layout->priv = G_TYPE_INSTANCE_GET_PRIVATE (layout,
 823                                               GTK_TYPE_LAYOUT,
 824                                               GtkLayoutPrivate);
 825   priv = layout->priv;
 826
 827   priv->children = NULL;
 828
 829   priv->width = 100;
 830   priv->height = 100;
 831
 832   priv->hadjustment = NULL;
 833   priv->vadjustment = NULL;
 834
 835   priv->bin_window = NULL;
 836
 837   priv->scroll_x = 0;
 838   priv->scroll_y = 0;
 839   priv->visibility = GDK_VISIBILITY_PARTIAL;
 840
 841   priv->freeze_count = 0;
 842 }
 843
 844 /* Widget methods
 845  */
 846
 847 static void
 848 gtk_layout_realize (GtkWidget *widget)
 849 {
 850   GtkLayout *layout = GTK_LAYOUT (widget);
 851   GtkLayoutPrivate *priv = layout->priv;
 852   GtkAllocation allocation;
 853   GdkWindow *window;
 854   GdkWindowAttr attributes;
 855   GList *tmp_list;
 856   gint attributes_mask;
 857
 858   gtk_widget_set_realized (widget, TRUE);
 859
 860   gtk_widget_get_allocation (widget, &allocation);
 861
 862   attributes.window_type = GDK_WINDOW_CHILD;
 863   attributes.x = allocation.x;
 864   attributes.y = allocation.y;
 865   attributes.width = allocation.width;
 866   attributes.height = allocation.height;
 867   attributes.wclass = GDK_INPUT_OUTPUT;
 868   attributes.visual = gtk_widget_get_visual (widget);
 869   attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;
 870
 871   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
 872
 873   window = gdk_window_new (gtk_widget_get_parent_window (widget),
 874                            &attributes, attributes_mask);
 875   gtk_widget_set_window (widget, window);
 876   gdk_window_set_user_data (window, widget);
 877
 878   gtk_widget_get_allocation (widget, &allocation);
 879
 880   attributes.x = - gtk_adjustment_get_value (priv->hadjustment),
 881   attributes.y = - gtk_adjustment_get_value (priv->vadjustment);
 882   attributes.width = MAX (priv->width, allocation.width);
 883   attributes.height = MAX (priv->height, allocation.height);
 884   attributes.event_mask = GDK_EXPOSURE_MASK | GDK_SCROLL_MASK |
 885                           gtk_widget_get_events (widget);
 886
 887   priv->bin_window = gdk_window_new (window,
 888                                      &attributes, attributes_mask);
 889   gdk_window_set_user_data (priv->bin_window, widget);
 890   gtk_style_context_set_background (gtk_widget_get_style_context (widget), priv->bin_window);
 891
 892   tmp_list = priv->children;
 893   while (tmp_list)
 894     {
 895       GtkLayoutChild *child = tmp_list->data;
 896       tmp_list = tmp_list->next;
 897
 898       gtk_widget_set_parent_window (child->widget, priv->bin_window);
 899     }
 900 }
 901
 902 static void
 903 gtk_layout_style_updated (GtkWidget *widget)
 904 {
 905   GtkLayoutPrivate *priv;
 906
 907   GTK_WIDGET_CLASS (gtk_layout_parent_class)->style_updated (widget);
 908
 909   if (gtk_widget_get_realized (widget))
 910     {
 911       priv = GTK_LAYOUT (widget)->priv;
 912       gtk_style_context_set_background (gtk_widget_get_style_context (widget), priv->bin_window);
 913     }
 914 }
 915
 916 static void
 917 gtk_layout_map (GtkWidget *widget)
 918 {
 919   GtkLayout *layout = GTK_LAYOUT (widget);
 920   GtkLayoutPrivate *priv = layout->priv;
 921   GList *tmp_list;
 922
 923   gtk_widget_set_mapped (widget, TRUE);
 924
 925   tmp_list = priv->children;
 926   while (tmp_list)
 927     {
 928       GtkLayoutChild *child = tmp_list->data;
 929       tmp_list = tmp_list->next;
 930
 931       if (gtk_widget_get_visible (child->widget))
 932         {
 933           if (!gtk_widget_get_mapped (child->widget))
 934             gtk_widget_map (child->widget);
 935         }
 936     }
 937
 938   gdk_window_show (priv->bin_window);
 939   gdk_window_show (gtk_widget_get_window (widget));
 940 }
 941
 942 static void
 943 gtk_layout_unrealize (GtkWidget *widget)
 944 {
 945   GtkLayout *layout = GTK_LAYOUT (widget);
 946   GtkLayoutPrivate *priv = layout->priv;
 947
 948   gdk_window_set_user_data (priv->bin_window, NULL);
 949   gdk_window_destroy (priv->bin_window);
 950   priv->bin_window = NULL;
 951
 952   GTK_WIDGET_CLASS (gtk_layout_parent_class)->unrealize (widget);
 953 }
 954
 955 static void
 956 gtk_layout_get_preferred_width (GtkWidget *widget,
 957                                 gint      *minimum,
 958                                 gint      *natural)
 959 {
 960   *minimum = *natural = 0;
 961 }
 962
 963 static void
 964 gtk_layout_get_preferred_height (GtkWidget *widget,
 965                                  gint      *minimum,
 966                                  gint      *natural)
 967 {
 968   *minimum = *natural = 0;
 969 }
 970
 971 static void
 972 gtk_layout_size_allocate (GtkWidget     *widget,
 973                           GtkAllocation *allocation)
 974 {
 975   GtkLayout *layout = GTK_LAYOUT (widget);
 976   GtkLayoutPrivate *priv = layout->priv;
 977   GList *tmp_list;
 978
 979   gtk_widget_set_allocation (widget, allocation);
 980
 981   tmp_list = priv->children;
 982
 983   while (tmp_list)
 984     {
 985       GtkLayoutChild *child = tmp_list->data;
 986       tmp_list = tmp_list->next;
 987
 988       gtk_layout_allocate_child (layout, child);
 989     }
 990
 991   if (gtk_widget_get_realized (widget))
 992     {
 993       gdk_window_move_resize (gtk_widget_get_window (widget),
 994                               allocation->x, allocation->y,
 995                               allocation->width, allocation->height);
 996
 997       gdk_window_resize (priv->bin_window,
 998                          MAX (priv->width, allocation->width),
 999                          MAX (priv->height, allocation->height));
1000     }
1001
1002   gtk_layout_set_hadjustment_values (layout);
1003   gtk_layout_set_vadjustment_values (layout);
1004 }
1005
1006 static gboolean
1007 gtk_layout_draw (GtkWidget *widget,
1008                  cairo_t   *cr)
1009 {
1010   GtkLayout *layout = GTK_LAYOUT (widget);
1011   GtkLayoutPrivate *priv = layout->priv;
1012
1013   if (gtk_cairo_should_draw_window (cr, priv->bin_window))
1014     GTK_WIDGET_CLASS (gtk_layout_parent_class)->draw (widget, cr);
1015
1016   return FALSE;
1017 }
1018
1019 /* Container methods
1020  */
1021 static void
1022 gtk_layout_add (GtkContainer *container,
1023                 GtkWidget    *widget)
1024 {
1025   gtk_layout_put (GTK_LAYOUT (container), widget, 0, 0);
1026 }
1027
1028 static void
1029 gtk_layout_remove (GtkContainer *container,
1030                    GtkWidget    *widget)
1031 {
1032   GtkLayout *layout = GTK_LAYOUT (container);
1033   GtkLayoutPrivate *priv = layout->priv;
1034   GList *tmp_list;
1035   GtkLayoutChild *child = NULL;
1036
1037   tmp_list = priv->children;
1038   while (tmp_list)
1039     {
1040       child = tmp_list->data;
1041       if (child->widget == widget)
1042         break;
1043       tmp_list = tmp_list->next;
1044     }
1045
1046   if (tmp_list)
1047     {
1048       gtk_widget_unparent (widget);
1049
1050       priv->children = g_list_remove_link (priv->children, tmp_list);
1051       g_list_free_1 (tmp_list);
1052       g_free (child);
1053     }
1054 }
1055
1056 static void
1057 gtk_layout_forall (GtkContainer *container,
1058                    gboolean      include_internals,
1059                    GtkCallback   callback,
1060                    gpointer      callback_data)
1061 {
1062   GtkLayout *layout = GTK_LAYOUT (container);
1063   GtkLayoutPrivate *priv = layout->priv;
1064   GtkLayoutChild *child;
1065   GList *tmp_list;
1066
1067   tmp_list = priv->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
1090   gtk_widget_get_preferred_size (child->widget, &requisition, NULL);
1091   allocation.width = requisition.width;
1092   allocation.height = requisition.height;
1093
1094   gtk_widget_size_allocate (child->widget, &allocation);
1095 }
1096
1097 /* Callbacks */
1098
1099 static void
1100 gtk_layout_adjustment_changed (GtkAdjustment *adjustment,
1101                                GtkLayout     *layout)
1102 {
1103   GtkLayoutPrivate *priv = layout->priv;
1104
1105   if (priv->freeze_count)
1106     return;
1107
1108   if (gtk_widget_get_realized (GTK_WIDGET (layout)))
1109     {
1110       gdk_window_move (priv->bin_window,
1111                        - gtk_adjustment_get_value (priv->hadjustment),
1112                        - gtk_adjustment_get_value (priv->vadjustment));
1113
1114       gdk_window_process_updates (priv->bin_window, TRUE);
1115     }
1116 }