Pileus Git - ~andy/gtk/blob - gtk/gtkviewport.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, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 /*
  19  * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
  20  * file for a list of people on the GTK+ Team.  See the ChangeLog
  21  * files for a list of changes.  These files are distributed with
  22  * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
  23  */
  24
  25 #include "config.h"
  26
  27 #include "gtkviewport.h"
  28
  29 #include "gtkadjustment.h"
  30 #include "gtkintl.h"
  31 #include "gtkmarshalers.h"
  32 #include "gtkprivate.h"
  33 #include "gtkscrollable.h"
  34 #include "gtktypebuiltins.h"
  35
  36
  37 /**
  38  * SECTION:gtkviewport
  39  * @Short_description: An adapter which makes widgets scrollable
  40  * @Title: GtkViewport
  41  * @See_also:#GtkScrolledWindow, #GtkAdjustment
  42  *
  43  * The #GtkViewport widget acts as an adaptor class, implementing
  44  * scrollability for child widgets that lack their own scrolling
  45  * capabilities. Use #GtkViewport to scroll child widgets such as
  46  * #GtkGrid, #GtkBox, and so on.
  47  *
  48  * If a widget has native scrolling abilities, such as #GtkTextView,
  49  * #GtkTreeView or #GtkIconView, it can be added to a #GtkScrolledWindow
  50  * with gtk_container_add(). If a widget does not, you must first add the
  51  * widget to a #GtkViewport, then add the viewport to the scrolled window.
  52  * gtk_container_add() does this automatically if a child that does not
  53  * implement #GtkScrollable is added to a #GtkScrolledWindow, so you can
  54  * ignore the presence of the viewport.
  55  *
  56  * The #GtkViewport will start scrolling content only if allocated less
  57  * than the child widget's minimum size in a given orientation.
  58  */
  59
  60 struct _GtkViewportPrivate
  61 {
  62   GtkAdjustment  *hadjustment;
  63   GtkAdjustment  *vadjustment;
  64   GtkShadowType   shadow_type;
  65
  66   GdkWindow      *bin_window;
  67   GdkWindow      *view_window;
  68
  69   /* GtkScrollablePolicy needs to be checked when
  70    * driving the scrollable adjustment values */
  71   guint hscroll_policy : 1;
  72   guint vscroll_policy : 1;
  73 };
  74
  75 enum {
  76   PROP_0,
  77   PROP_HADJUSTMENT,
  78   PROP_VADJUSTMENT,
  79   PROP_HSCROLL_POLICY,
  80   PROP_VSCROLL_POLICY,
  81   PROP_SHADOW_TYPE
  82 };
  83
  84
  85 static void gtk_viewport_set_property             (GObject         *object,
  86                                                    guint            prop_id,
  87                                                    const GValue    *value,
  88                                                    GParamSpec      *pspec);
  89 static void gtk_viewport_get_property             (GObject         *object,
  90                                                    guint            prop_id,
  91                                                    GValue          *value,
  92                                                    GParamSpec      *pspec);
  93 static void gtk_viewport_destroy                  (GtkWidget        *widget);
  94 static void gtk_viewport_realize                  (GtkWidget        *widget);
  95 static void gtk_viewport_unrealize                (GtkWidget        *widget);
  96 static gint gtk_viewport_draw                     (GtkWidget        *widget,
  97                                                    cairo_t          *cr);
  98 static void gtk_viewport_add                      (GtkContainer     *container,
  99                                                    GtkWidget        *widget);
 100 static void gtk_viewport_size_allocate            (GtkWidget        *widget,
 101                                                    GtkAllocation    *allocation);
 102 static void gtk_viewport_adjustment_value_changed (GtkAdjustment    *adjustment,
 103                                                    gpointer          data);
 104 static void gtk_viewport_style_updated            (GtkWidget        *widget);
 105
 106 static void gtk_viewport_get_preferred_width      (GtkWidget        *widget,
 107                                                    gint             *minimum_size,
 108                                                    gint             *natural_size);
 109 static void gtk_viewport_get_preferred_height     (GtkWidget        *widget,
 110                                                    gint             *minimum_size,
 111                                                    gint             *natural_size);
 112
 113 static void viewport_set_adjustment               (GtkViewport      *viewport,
 114                                                    GtkOrientation    orientation,
 115                                                    GtkAdjustment    *adjustment);
 116
 117 G_DEFINE_TYPE_WITH_CODE (GtkViewport, gtk_viewport, GTK_TYPE_BIN,
 118                          G_IMPLEMENT_INTERFACE (GTK_TYPE_SCROLLABLE, NULL))
 119
 120 static void
 121 gtk_viewport_class_init (GtkViewportClass *class)
 122 {
 123   GObjectClass   *gobject_class;
 124   GtkWidgetClass *widget_class;
 125   GtkContainerClass *container_class;
 126
 127   gobject_class = G_OBJECT_CLASS (class);
 128   widget_class = (GtkWidgetClass*) class;
 129   container_class = (GtkContainerClass*) class;
 130
 131   gobject_class->set_property = gtk_viewport_set_property;
 132   gobject_class->get_property = gtk_viewport_get_property;
 133
 134   widget_class->destroy = gtk_viewport_destroy;
 135   widget_class->realize = gtk_viewport_realize;
 136   widget_class->unrealize = gtk_viewport_unrealize;
 137   widget_class->draw = gtk_viewport_draw;
 138   widget_class->size_allocate = gtk_viewport_size_allocate;
 139   widget_class->style_updated = gtk_viewport_style_updated;
 140   widget_class->get_preferred_width = gtk_viewport_get_preferred_width;
 141   widget_class->get_preferred_height = gtk_viewport_get_preferred_height;
 142
 143   gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_VIEWPORT);
 144
 145   container_class->add = gtk_viewport_add;
 146
 147   /* GtkScrollable implementation */
 148   g_object_class_override_property (gobject_class, PROP_HADJUSTMENT,    "hadjustment");
 149   g_object_class_override_property (gobject_class, PROP_VADJUSTMENT,    "vadjustment");
 150   g_object_class_override_property (gobject_class, PROP_HSCROLL_POLICY, "hscroll-policy");
 151   g_object_class_override_property (gobject_class, PROP_VSCROLL_POLICY, "vscroll-policy");
 152
 153   g_object_class_install_property (gobject_class,
 154                                    PROP_SHADOW_TYPE,
 155                                    g_param_spec_enum ("shadow-type",
 156                                                       P_("Shadow type"),
 157                                                       P_("Determines how the shadowed box around the viewport is drawn"),
 158                                                       GTK_TYPE_SHADOW_TYPE,
 159                                                       GTK_SHADOW_IN,
 160                                                       GTK_PARAM_READWRITE));
 161
 162   g_type_class_add_private (class, sizeof (GtkViewportPrivate));
 163 }
 164
 165 static void
 166 gtk_viewport_set_property (GObject         *object,
 167                            guint            prop_id,
 168                            const GValue    *value,
 169                            GParamSpec      *pspec)
 170 {
 171   GtkViewport *viewport;
 172
 173   viewport = GTK_VIEWPORT (object);
 174
 175   switch (prop_id)
 176     {
 177     case PROP_HADJUSTMENT:
 178       viewport_set_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL, g_value_get_object (value));
 179       break;
 180     case PROP_VADJUSTMENT:
 181       viewport_set_adjustment (viewport, GTK_ORIENTATION_VERTICAL, g_value_get_object (value));
 182       break;
 183     case PROP_HSCROLL_POLICY:
 184       viewport->priv->hscroll_policy = g_value_get_enum (value);
 185       gtk_widget_queue_resize (GTK_WIDGET (viewport));
 186       break;
 187     case PROP_VSCROLL_POLICY:
 188       viewport->priv->vscroll_policy = g_value_get_enum (value);
 189       gtk_widget_queue_resize (GTK_WIDGET (viewport));
 190       break;
 191     case PROP_SHADOW_TYPE:
 192       gtk_viewport_set_shadow_type (viewport, g_value_get_enum (value));
 193       break;
 194     default:
 195       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 196       break;
 197     }
 198 }
 199
 200 static void
 201 gtk_viewport_get_property (GObject         *object,
 202                            guint            prop_id,
 203                            GValue          *value,
 204                            GParamSpec      *pspec)
 205 {
 206   GtkViewport *viewport = GTK_VIEWPORT (object);
 207   GtkViewportPrivate *priv = viewport->priv;
 208
 209   switch (prop_id)
 210     {
 211     case PROP_HADJUSTMENT:
 212       g_value_set_object (value, priv->hadjustment);
 213       break;
 214     case PROP_VADJUSTMENT:
 215       g_value_set_object (value, priv->vadjustment);
 216       break;
 217     case PROP_HSCROLL_POLICY:
 218       g_value_set_enum (value, priv->hscroll_policy);
 219       break;
 220     case PROP_VSCROLL_POLICY:
 221       g_value_set_enum (value, priv->vscroll_policy);
 222       break;
 223     case PROP_SHADOW_TYPE:
 224       g_value_set_enum (value, priv->shadow_type);
 225       break;
 226     default:
 227       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 228       break;
 229     }
 230 }
 231
 232 static void
 233 gtk_viewport_init (GtkViewport *viewport)
 234 {
 235   GtkViewportPrivate *priv;
 236
 237   viewport->priv = G_TYPE_INSTANCE_GET_PRIVATE (viewport,
 238                                                 GTK_TYPE_VIEWPORT,
 239                                                 GtkViewportPrivate);
 240   priv = viewport->priv;
 241
 242   gtk_widget_set_has_window (GTK_WIDGET (viewport), TRUE);
 243
 244   gtk_widget_set_redraw_on_allocate (GTK_WIDGET (viewport), FALSE);
 245
 246   priv->shadow_type = GTK_SHADOW_IN;
 247   priv->view_window = NULL;
 248   priv->bin_window = NULL;
 249   priv->hadjustment = NULL;
 250   priv->vadjustment = NULL;
 251
 252   viewport_set_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL, NULL);
 253   viewport_set_adjustment (viewport, GTK_ORIENTATION_VERTICAL, NULL);
 254 }
 255
 256 /**
 257  * gtk_viewport_new:
 258  * @hadjustment: horizontal adjustment
 259  * @vadjustment: vertical adjustment
 260  *
 261  * Creates a new #GtkViewport with the given adjustments.
 262  *
 263  * Returns: a new #GtkViewport
 264  */
 265 GtkWidget*
 266 gtk_viewport_new (GtkAdjustment *hadjustment,
 267                   GtkAdjustment *vadjustment)
 268 {
 269   GtkWidget *viewport;
 270
 271   viewport = g_object_new (GTK_TYPE_VIEWPORT,
 272                              "hadjustment", hadjustment,
 273                              "vadjustment", vadjustment,
 274                              NULL);
 275
 276   return viewport;
 277 }
 278
 279 #define ADJUSTMENT_POINTER(viewport, orientation)         \
 280   (((orientation) == GTK_ORIENTATION_HORIZONTAL) ?        \
 281      &(viewport)->priv->hadjustment : &(viewport)->priv->vadjustment)
 282
 283 static void
 284 viewport_disconnect_adjustment (GtkViewport    *viewport,
 285                                 GtkOrientation  orientation)
 286 {
 287   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 288
 289   if (*adjustmentp)
 290     {
 291       g_signal_handlers_disconnect_by_func (*adjustmentp,
 292                                             gtk_viewport_adjustment_value_changed,
 293                                             viewport);
 294       g_object_unref (*adjustmentp);
 295       *adjustmentp = NULL;
 296     }
 297 }
 298
 299 static void
 300 gtk_viewport_destroy (GtkWidget *widget)
 301 {
 302   GtkViewport *viewport = GTK_VIEWPORT (widget);
 303
 304   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
 305   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
 306
 307   GTK_WIDGET_CLASS (gtk_viewport_parent_class)->destroy (widget);
 308 }
 309
 310 static void
 311 viewport_get_view_allocation (GtkViewport   *viewport,
 312                               GtkAllocation *view_allocation)
 313 {
 314   GtkViewportPrivate *priv = viewport->priv;
 315   GtkWidget *widget = GTK_WIDGET (viewport);
 316   GtkAllocation allocation;
 317   GtkStyleContext *context;
 318   GtkStateFlags state;
 319   GtkBorder padding, border;
 320   guint border_width;
 321
 322   gtk_widget_get_allocation (widget, &allocation);
 323   border_width = gtk_container_get_border_width (GTK_CONTAINER (viewport));
 324
 325   view_allocation->x = 0;
 326   view_allocation->y = 0;
 327
 328   context = gtk_widget_get_style_context (widget);
 329   state = gtk_widget_get_state_flags (widget);
 330   gtk_style_context_save (context);
 331   gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME);
 332
 333   gtk_style_context_get_padding (context, state, &padding);
 334   gtk_style_context_get_border (context, state, &border);
 335
 336   gtk_style_context_restore (context);
 337
 338   if (priv->shadow_type != GTK_SHADOW_NONE)
 339     {
 340       view_allocation->x = border.left;
 341       view_allocation->y = border.top;
 342     }
 343
 344   view_allocation->x += padding.left;
 345   view_allocation->y += padding.top;
 346   view_allocation->width = MAX (1, allocation.width - padding.left - padding.right - border_width * 2);
 347   view_allocation->height = MAX (1, allocation.height - padding.top - padding.bottom - border_width * 2);
 348
 349   if (priv->shadow_type != GTK_SHADOW_NONE)
 350     {
 351       view_allocation->width = MAX (1, view_allocation->width - border.left - border.right);
 352       view_allocation->height = MAX (1, view_allocation->height - border.top - border.bottom);
 353     }
 354 }
 355
 356 /**
 357  * gtk_viewport_get_hadjustment:
 358  * @viewport: a #GtkViewport.
 359  *
 360  * Returns the horizontal adjustment of the viewport.
 361  *
 362  * Return value: (transfer none): the horizontal adjustment of @viewport.
 363  *
 364  * Deprecated: 3.0: Use gtk_scrollable_get_hadjustment()
 365  **/
 366 GtkAdjustment*
 367 gtk_viewport_get_hadjustment (GtkViewport *viewport)
 368 {
 369   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 370
 371   return viewport->priv->hadjustment;
 372 }
 373
 374 /**
 375  * gtk_viewport_get_vadjustment:
 376  * @viewport: a #GtkViewport.
 377  *
 378  * Returns the vertical adjustment of the viewport.
 379  *
 380  * Return value: (transfer none): the vertical adjustment of @viewport.
 381  *
 382  * Deprecated: 3.0: Use gtk_scrollable_get_vadjustment()
 383  **/
 384 GtkAdjustment*
 385 gtk_viewport_get_vadjustment (GtkViewport *viewport)
 386 {
 387   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 388
 389   return viewport->priv->vadjustment;
 390 }
 391
 392 static void
 393 viewport_set_hadjustment_values (GtkViewport *viewport)
 394 {
 395   GtkBin *bin = GTK_BIN (viewport);
 396   GtkAllocation view_allocation;
 397   GtkAdjustment *hadjustment = viewport->priv->hadjustment;
 398   GtkWidget *child;
 399   gdouble upper, value;
 400
 401   viewport_get_view_allocation (viewport, &view_allocation);
 402
 403   child = gtk_bin_get_child (bin);
 404   if (child && gtk_widget_get_visible (child))
 405     {
 406       gint minimum_width, natural_width;
 407       gint scroll_height;
 408
 409       if (viewport->priv->vscroll_policy == GTK_SCROLL_MINIMUM)
 410         gtk_widget_get_preferred_height (child, &scroll_height, NULL);
 411       else
 412         gtk_widget_get_preferred_height (child, NULL, &scroll_height);
 413
 414       gtk_widget_get_preferred_width_for_height (child,
 415                                                  MAX (view_allocation.height, scroll_height),
 416                                                  &minimum_width,
 417                                                  &natural_width);
 418
 419       if (viewport->priv->hscroll_policy == GTK_SCROLL_MINIMUM)
 420         upper = MAX (minimum_width, view_allocation.width);
 421       else
 422         upper = MAX (natural_width, view_allocation.width);
 423     }
 424   else
 425     upper = view_allocation.width;
 426
 427   value = gtk_adjustment_get_value (hadjustment);
 428   /* We clamp to the left in RTL mode */
 429   if (gtk_widget_get_direction (GTK_WIDGET (viewport)) == GTK_TEXT_DIR_RTL)
 430     {
 431       gdouble dist = gtk_adjustment_get_upper (hadjustment)
 432                      - value
 433                      - gtk_adjustment_get_page_size (hadjustment);
 434       value = upper - dist - view_allocation.width;
 435     }
 436
 437   gtk_adjustment_configure (hadjustment,
 438                             value,
 439                             0,
 440                             upper,
 441                             view_allocation.width * 0.1,
 442                             view_allocation.width * 0.9,
 443                             view_allocation.width);
 444 }
 445
 446 static void
 447 viewport_set_vadjustment_values (GtkViewport *viewport)
 448 {
 449   GtkBin *bin = GTK_BIN (viewport);
 450   GtkAllocation view_allocation;
 451   GtkAdjustment *vadjustment = viewport->priv->vadjustment;
 452   GtkWidget *child;
 453   gdouble upper;
 454
 455   viewport_get_view_allocation (viewport, &view_allocation);
 456
 457   child = gtk_bin_get_child (bin);
 458   if (child && gtk_widget_get_visible (child))
 459     {
 460       gint minimum_height, natural_height;
 461       gint scroll_width;
 462
 463       if (viewport->priv->hscroll_policy == GTK_SCROLL_MINIMUM)
 464         gtk_widget_get_preferred_width (child, &scroll_width, NULL);
 465       else
 466         gtk_widget_get_preferred_width (child, NULL, &scroll_width);
 467
 468       gtk_widget_get_preferred_height_for_width (child,
 469                                                  MAX (view_allocation.width, scroll_width),
 470                                                  &minimum_height,
 471                                                  &natural_height);
 472
 473       if (viewport->priv->vscroll_policy == GTK_SCROLL_MINIMUM)
 474         upper = MAX (minimum_height, view_allocation.height);
 475       else
 476         upper = MAX (natural_height, view_allocation.height);
 477     }
 478   else
 479     upper = view_allocation.height;
 480
 481   gtk_adjustment_configure (vadjustment,
 482                             gtk_adjustment_get_value (vadjustment),
 483                             0,
 484                             upper,
 485                             view_allocation.height * 0.1,
 486                             view_allocation.height * 0.9,
 487                             view_allocation.height);
 488 }
 489
 490 static void
 491 viewport_set_adjustment (GtkViewport    *viewport,
 492                          GtkOrientation  orientation,
 493                          GtkAdjustment  *adjustment)
 494 {
 495   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 496
 497   if (adjustment && adjustment == *adjustmentp)
 498     return;
 499
 500   if (!adjustment)
 501     adjustment = gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
 502   viewport_disconnect_adjustment (viewport, orientation);
 503   *adjustmentp = adjustment;
 504   g_object_ref_sink (adjustment);
 505
 506   if (orientation == GTK_ORIENTATION_HORIZONTAL)
 507     viewport_set_hadjustment_values (viewport);
 508   else
 509     viewport_set_vadjustment_values (viewport);
 510
 511   g_signal_connect (adjustment, "value-changed",
 512                     G_CALLBACK (gtk_viewport_adjustment_value_changed),
 513                     viewport);
 514
 515   gtk_viewport_adjustment_value_changed (adjustment, viewport);
 516 }
 517
 518 /**
 519  * gtk_viewport_set_hadjustment:
 520  * @viewport: a #GtkViewport.
 521  * @adjustment: (allow-none): a #GtkAdjustment.
 522  *
 523  * Sets the horizontal adjustment of the viewport.
 524  *
 525  * Deprecated: 3.0: Use gtk_scrollable_set_hadjustment()
 526  **/
 527 void
 528 gtk_viewport_set_hadjustment (GtkViewport   *viewport,
 529                               GtkAdjustment *adjustment)
 530 {
 531   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 532   if (adjustment)
 533     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 534
 535   viewport_set_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL, adjustment);
 536
 537   g_object_notify (G_OBJECT (viewport), "hadjustment");
 538 }
 539
 540 /**
 541  * gtk_viewport_set_vadjustment:
 542  * @viewport: a #GtkViewport.
 543  * @adjustment: (allow-none): a #GtkAdjustment.
 544  *
 545  * Sets the vertical adjustment of the viewport.
 546  *
 547  * Deprecated: 3.0: Use gtk_scrollable_set_vadjustment()
 548  **/
 549 void
 550 gtk_viewport_set_vadjustment (GtkViewport   *viewport,
 551                               GtkAdjustment *adjustment)
 552 {
 553   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 554   if (adjustment)
 555     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 556
 557   viewport_set_adjustment (viewport, GTK_ORIENTATION_VERTICAL, adjustment);
 558
 559   g_object_notify (G_OBJECT (viewport), "vadjustment");
 560 }
 561
 562 /**
 563  * gtk_viewport_set_shadow_type:
 564  * @viewport: a #GtkViewport.
 565  * @type: the new shadow type.
 566  *
 567  * Sets the shadow type of the viewport.
 568  **/
 569 void
 570 gtk_viewport_set_shadow_type (GtkViewport   *viewport,
 571                               GtkShadowType  type)
 572 {
 573   GtkViewportPrivate *priv;
 574   GtkAllocation allocation;
 575   GtkWidget *widget;
 576
 577   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 578
 579   widget = GTK_WIDGET (viewport);
 580   priv = viewport->priv;
 581
 582   if ((GtkShadowType) priv->shadow_type != type)
 583     {
 584       priv->shadow_type = type;
 585
 586       if (gtk_widget_get_visible (widget))
 587         {
 588           gtk_widget_get_allocation (widget, &allocation);
 589           gtk_widget_size_allocate (widget, &allocation);
 590           gtk_widget_set_allocation (widget, &allocation);
 591           gtk_widget_queue_draw (widget);
 592         }
 593
 594       g_object_notify (G_OBJECT (viewport), "shadow-type");
 595     }
 596 }
 597
 598 /**
 599  * gtk_viewport_get_shadow_type:
 600  * @viewport: a #GtkViewport
 601  *
 602  * Gets the shadow type of the #GtkViewport. See
 603  * gtk_viewport_set_shadow_type().
 604  *
 605  * Return value: the shadow type
 606  **/
 607 GtkShadowType
 608 gtk_viewport_get_shadow_type (GtkViewport *viewport)
 609 {
 610   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), GTK_SHADOW_NONE);
 611
 612   return viewport->priv->shadow_type;
 613 }
 614
 615 /**
 616  * gtk_viewport_get_bin_window:
 617  * @viewport: a #GtkViewport
 618  *
 619  * Gets the bin window of the #GtkViewport.
 620  *
 621  * Return value: (transfer none): a #GdkWindow
 622  *
 623  * Since: 2.20
 624  **/
 625 GdkWindow*
 626 gtk_viewport_get_bin_window (GtkViewport *viewport)
 627 {
 628   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 629
 630   return viewport->priv->bin_window;
 631 }
 632
 633 /**
 634  * gtk_viewport_get_view_window:
 635  * @viewport: a #GtkViewport
 636  *
 637  * Gets the view window of the #GtkViewport.
 638  *
 639  * Return value: (transfer none): a #GdkWindow
 640  *
 641  * Since: 2.22
 642  **/
 643 GdkWindow*
 644 gtk_viewport_get_view_window (GtkViewport *viewport)
 645 {
 646   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 647
 648   return viewport->priv->view_window;
 649 }
 650
 651 static void
 652 gtk_viewport_realize (GtkWidget *widget)
 653 {
 654   GtkViewport *viewport = GTK_VIEWPORT (widget);
 655   GtkViewportPrivate *priv = viewport->priv;
 656   GtkBin *bin = GTK_BIN (widget);
 657   GtkAdjustment *hadjustment = priv->hadjustment;
 658   GtkAdjustment *vadjustment = priv->vadjustment;
 659   GtkAllocation allocation;
 660   GtkAllocation view_allocation;
 661   GtkStyleContext *context;
 662   GtkWidget *child;
 663   GdkWindow *window;
 664   GdkWindowAttr attributes;
 665   gint attributes_mask;
 666   gint event_mask;
 667   guint border_width;
 668
 669   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
 670
 671   gtk_widget_set_realized (widget, TRUE);
 672
 673   gtk_widget_get_allocation (widget, &allocation);
 674
 675   attributes.x = allocation.x + border_width;
 676   attributes.y = allocation.y + border_width;
 677   attributes.width = allocation.width - border_width * 2;
 678   attributes.height = allocation.height - border_width * 2;
 679   attributes.window_type = GDK_WINDOW_CHILD;
 680   attributes.wclass = GDK_INPUT_OUTPUT;
 681   attributes.visual = gtk_widget_get_visual (widget);
 682
 683   event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 684
 685   attributes.event_mask = event_mask | GDK_SCROLL_MASK | GDK_TOUCH_MASK | GDK_SMOOTH_SCROLL_MASK;
 686
 687   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
 688
 689   window = gdk_window_new (gtk_widget_get_parent_window (widget),
 690                            &attributes, attributes_mask);
 691   gtk_widget_set_window (widget, window);
 692   gdk_window_set_user_data (window, viewport);
 693
 694   viewport_get_view_allocation (viewport, &view_allocation);
 695
 696   attributes.x = view_allocation.x;
 697   attributes.y = view_allocation.y;
 698   attributes.width = view_allocation.width;
 699   attributes.height = view_allocation.height;
 700   attributes.event_mask = 0;
 701
 702   priv->view_window = gdk_window_new (window,
 703                                       &attributes, attributes_mask);
 704   gdk_window_set_user_data (priv->view_window, viewport);
 705
 706   attributes.x = - gtk_adjustment_get_value (hadjustment);
 707   attributes.y = - gtk_adjustment_get_value (vadjustment);
 708   attributes.width = gtk_adjustment_get_upper (hadjustment);
 709   attributes.height = gtk_adjustment_get_upper (vadjustment);
 710
 711   attributes.event_mask = event_mask;
 712
 713   priv->bin_window = gdk_window_new (priv->view_window, &attributes, attributes_mask);
 714   gdk_window_set_user_data (priv->bin_window, viewport);
 715
 716   child = gtk_bin_get_child (bin);
 717   if (child)
 718     gtk_widget_set_parent_window (child, priv->bin_window);
 719
 720   context = gtk_widget_get_style_context (widget);
 721   gtk_style_context_set_background (context, window);
 722   gtk_style_context_set_background (context, priv->bin_window);
 723
 724   gdk_window_show (priv->bin_window);
 725   gdk_window_show (priv->view_window);
 726 }
 727
 728 static void
 729 gtk_viewport_unrealize (GtkWidget *widget)
 730 {
 731   GtkViewport *viewport = GTK_VIEWPORT (widget);
 732   GtkViewportPrivate *priv = viewport->priv;
 733
 734   gdk_window_set_user_data (priv->view_window, NULL);
 735   gdk_window_destroy (priv->view_window);
 736   priv->view_window = NULL;
 737
 738   gdk_window_set_user_data (priv->bin_window, NULL);
 739   gdk_window_destroy (priv->bin_window);
 740   priv->bin_window = NULL;
 741
 742   GTK_WIDGET_CLASS (gtk_viewport_parent_class)->unrealize (widget);
 743 }
 744
 745 static gint
 746 gtk_viewport_draw (GtkWidget *widget,
 747                    cairo_t   *cr)
 748 {
 749   GtkViewport *viewport = GTK_VIEWPORT (widget);
 750   GtkViewportPrivate *priv = viewport->priv;
 751   GtkStyleContext *context;
 752   int x, y;
 753
 754   context = gtk_widget_get_style_context (widget);
 755
 756   if (gtk_cairo_should_draw_window (cr, gtk_widget_get_window (widget)) &&
 757       priv->shadow_type != GTK_SHADOW_NONE)
 758     {
 759       gtk_style_context_save (context);
 760       gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME);
 761
 762       gtk_render_frame (context, cr, 0, 0,
 763                         gdk_window_get_width (gtk_widget_get_window (widget)),
 764                         gdk_window_get_height (gtk_widget_get_window (widget)));
 765
 766       gtk_style_context_restore (context);
 767     }
 768
 769   if (gtk_cairo_should_draw_window (cr, priv->view_window))
 770     {
 771       /* This is a cute hack to ensure the contents of bin_window are
 772        * restricted to where they are visible. We only need to do this
 773        * clipping when called via gtk_widget_draw() and not in expose
 774        * events. And when that happens every window (including this one)
 775        * should be drawn.
 776        */
 777       gdk_window_get_position (priv->view_window, &x, &y);
 778       cairo_rectangle (cr, x, y,
 779                        gdk_window_get_width (priv->view_window),
 780                        gdk_window_get_height (priv->view_window));
 781       cairo_clip (cr);
 782     }
 783
 784   if (gtk_cairo_should_draw_window (cr, priv->bin_window))
 785     {
 786       gdk_window_get_position (priv->bin_window, &x, &y);
 787       gtk_render_background (context, cr, x, y,
 788                              gdk_window_get_width (priv->bin_window),
 789                              gdk_window_get_height (priv->bin_window));
 790
 791       GTK_WIDGET_CLASS (gtk_viewport_parent_class)->draw (widget, cr);
 792     }
 793
 794   return FALSE;
 795 }
 796
 797 static void
 798 gtk_viewport_add (GtkContainer *container,
 799                   GtkWidget    *child)
 800 {
 801   GtkBin *bin = GTK_BIN (container);
 802   GtkViewport *viewport = GTK_VIEWPORT (bin);
 803   GtkViewportPrivate *priv = viewport->priv;
 804
 805   g_return_if_fail (gtk_bin_get_child (bin) == NULL);
 806
 807   gtk_widget_set_parent_window (child, priv->bin_window);
 808
 809   GTK_CONTAINER_CLASS (gtk_viewport_parent_class)->add (container, child);
 810 }
 811
 812 static void
 813 gtk_viewport_size_allocate (GtkWidget     *widget,
 814                             GtkAllocation *allocation)
 815 {
 816   GtkAllocation widget_allocation;
 817   GtkViewport *viewport = GTK_VIEWPORT (widget);
 818   GtkViewportPrivate *priv = viewport->priv;
 819   GtkBin *bin = GTK_BIN (widget);
 820   guint border_width;
 821   GtkAdjustment *hadjustment = priv->hadjustment;
 822   GtkAdjustment *vadjustment = priv->vadjustment;
 823   GtkAllocation child_allocation;
 824   GtkWidget *child;
 825
 826   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
 827
 828   /* If our size changed, and we have a shadow, queue a redraw on widget->window to
 829    * redraw the shadow correctly.
 830    */
 831   gtk_widget_get_allocation (widget, &widget_allocation);
 832   if (gtk_widget_get_mapped (widget) &&
 833       priv->shadow_type != GTK_SHADOW_NONE &&
 834       (widget_allocation.width != allocation->width ||
 835        widget_allocation.height != allocation->height))
 836     gdk_window_invalidate_rect (gtk_widget_get_window (widget), NULL, FALSE);
 837
 838   gtk_widget_set_allocation (widget, allocation);
 839
 840   g_object_freeze_notify (G_OBJECT (hadjustment));
 841   g_object_freeze_notify (G_OBJECT (vadjustment));
 842
 843   viewport_set_hadjustment_values (viewport);
 844   viewport_set_vadjustment_values (viewport);
 845
 846   child_allocation.x = 0;
 847   child_allocation.y = 0;
 848   child_allocation.width = gtk_adjustment_get_upper (hadjustment);
 849   child_allocation.height = gtk_adjustment_get_upper (vadjustment);
 850   if (gtk_widget_get_realized (widget))
 851     {
 852       GtkAllocation view_allocation;
 853
 854       gdk_window_move_resize (gtk_widget_get_window (widget),
 855                               allocation->x + border_width,
 856                               allocation->y + border_width,
 857                               allocation->width - border_width * 2,
 858                               allocation->height - border_width * 2);
 859
 860       viewport_get_view_allocation (viewport, &view_allocation);
 861       gdk_window_move_resize (priv->view_window,
 862                               view_allocation.x,
 863                               view_allocation.y,
 864                               view_allocation.width,
 865                               view_allocation.height);
 866       gdk_window_move_resize (priv->bin_window,
 867                               - gtk_adjustment_get_value (hadjustment),
 868                               - gtk_adjustment_get_value (vadjustment),
 869                               child_allocation.width,
 870                               child_allocation.height);
 871     }
 872
 873   child = gtk_bin_get_child (bin);
 874   if (child && gtk_widget_get_visible (child))
 875     gtk_widget_size_allocate (child, &child_allocation);
 876
 877   g_object_thaw_notify (G_OBJECT (hadjustment));
 878   g_object_thaw_notify (G_OBJECT (vadjustment));
 879 }
 880
 881 static void
 882 gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
 883                                        gpointer       data)
 884 {
 885   GtkViewport *viewport = GTK_VIEWPORT (data);
 886   GtkViewportPrivate *priv = viewport->priv;
 887   GtkBin *bin = GTK_BIN (data);
 888   GtkWidget *child;
 889
 890   child = gtk_bin_get_child (bin);
 891   if (child && gtk_widget_get_visible (child) &&
 892       gtk_widget_get_realized (GTK_WIDGET (viewport)))
 893     {
 894       GtkAdjustment *hadjustment = priv->hadjustment;
 895       GtkAdjustment *vadjustment = priv->vadjustment;
 896       gint old_x, old_y;
 897       gint new_x, new_y;
 898
 899       gdk_window_get_position (priv->bin_window, &old_x, &old_y);
 900       new_x = - gtk_adjustment_get_value (hadjustment);
 901       new_y = - gtk_adjustment_get_value (vadjustment);
 902
 903       if (new_x != old_x || new_y != old_y)
 904         gdk_window_move (priv->bin_window, new_x, new_y);
 905     }
 906 }
 907
 908 static void
 909 gtk_viewport_style_updated (GtkWidget *widget)
 910 {
 911    GTK_WIDGET_CLASS (gtk_viewport_parent_class)->style_updated (widget);
 912
 913    if (gtk_widget_get_realized (widget) &&
 914        gtk_widget_get_has_window (widget))
 915      {
 916         GtkStyleContext *context;
 917         GtkViewport *viewport = GTK_VIEWPORT (widget);
 918         GtkViewportPrivate *priv = viewport->priv;
 919
 920         context = gtk_widget_get_style_context (widget);
 921         gtk_style_context_set_background (context, priv->bin_window);
 922         gtk_style_context_set_background (context, gtk_widget_get_window (widget));
 923      }
 924 }
 925
 926
 927 static void
 928 gtk_viewport_get_preferred_size (GtkWidget      *widget,
 929                                  GtkOrientation  orientation,
 930                                  gint           *minimum_size,
 931                                  gint           *natural_size)
 932 {
 933   GtkViewport *viewport = GTK_VIEWPORT (widget);
 934   GtkViewportPrivate *priv = viewport->priv;
 935   GtkStyleContext *context;
 936   GtkStateFlags state;
 937   GtkBorder padding, border;
 938   GtkWidget *child;
 939   gint       child_min, child_nat;
 940   gint       minimum, natural;
 941
 942   child = gtk_bin_get_child (GTK_BIN (widget));
 943
 944   /* XXX This should probably be (border_width * 2); but GTK+ has
 945    * been doing this with a single border for a while now...
 946    */
 947   minimum = gtk_container_get_border_width (GTK_CONTAINER (widget));
 948
 949   context = gtk_widget_get_style_context (GTK_WIDGET (widget));
 950   state = gtk_widget_get_state_flags (GTK_WIDGET (widget));
 951   gtk_style_context_get_padding (context, state, &padding);
 952
 953   if (priv->shadow_type != GTK_SHADOW_NONE)
 954     {
 955       gtk_style_context_get_border (context, state, &border);
 956
 957       if (orientation == GTK_ORIENTATION_HORIZONTAL)
 958         minimum += border.left + border.right;
 959       else
 960         minimum += border.top + border.bottom;
 961     }
 962
 963   if (orientation == GTK_ORIENTATION_HORIZONTAL)
 964     minimum += padding.left + padding.right;
 965   else
 966     minimum += padding.top + padding.bottom;
 967
 968   natural = minimum;
 969
 970   if (child && gtk_widget_get_visible (child))
 971     {
 972       if (orientation == GTK_ORIENTATION_HORIZONTAL)
 973         gtk_widget_get_preferred_width (child, &child_min, &child_nat);
 974       else
 975         gtk_widget_get_preferred_height (child, &child_min, &child_nat);
 976
 977       minimum += child_min;
 978       natural += child_nat;
 979     }
 980
 981   if (minimum_size)
 982     *minimum_size = minimum;
 983
 984   if (natural_size)
 985     *natural_size = natural;
 986 }
 987
 988 static void
 989 gtk_viewport_get_preferred_width (GtkWidget *widget,
 990                                   gint      *minimum_size,
 991                                   gint      *natural_size)
 992 {
 993   gtk_viewport_get_preferred_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
 994 }
 995
 996 static void
 997 gtk_viewport_get_preferred_height (GtkWidget *widget,
 998                                    gint      *minimum_size,
 999                                    gint      *natural_size)
1000 {
1001   gtk_viewport_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
1002 }