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: (allow-none): horizontal adjustment
 259  * @vadjustment: (allow-none): vertical adjustment
 260  *
 261  * Creates a new #GtkViewport with the given adjustments, or with default
 262  * adjustments if none are given.
 263  *
 264  * Returns: a new #GtkViewport
 265  */
 266 GtkWidget*
 267 gtk_viewport_new (GtkAdjustment *hadjustment,
 268                   GtkAdjustment *vadjustment)
 269 {
 270   GtkWidget *viewport;
 271
 272   viewport = g_object_new (GTK_TYPE_VIEWPORT,
 273                              "hadjustment", hadjustment,
 274                              "vadjustment", vadjustment,
 275                              NULL);
 276
 277   return viewport;
 278 }
 279
 280 #define ADJUSTMENT_POINTER(viewport, orientation)         \
 281   (((orientation) == GTK_ORIENTATION_HORIZONTAL) ?        \
 282      &(viewport)->priv->hadjustment : &(viewport)->priv->vadjustment)
 283
 284 static void
 285 viewport_disconnect_adjustment (GtkViewport    *viewport,
 286                                 GtkOrientation  orientation)
 287 {
 288   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 289
 290   if (*adjustmentp)
 291     {
 292       g_signal_handlers_disconnect_by_func (*adjustmentp,
 293                                             gtk_viewport_adjustment_value_changed,
 294                                             viewport);
 295       g_object_unref (*adjustmentp);
 296       *adjustmentp = NULL;
 297     }
 298 }
 299
 300 static void
 301 gtk_viewport_destroy (GtkWidget *widget)
 302 {
 303   GtkViewport *viewport = GTK_VIEWPORT (widget);
 304
 305   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
 306   viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
 307
 308   GTK_WIDGET_CLASS (gtk_viewport_parent_class)->destroy (widget);
 309 }
 310
 311 static void
 312 viewport_get_view_allocation (GtkViewport   *viewport,
 313                               GtkAllocation *view_allocation)
 314 {
 315   GtkViewportPrivate *priv = viewport->priv;
 316   GtkWidget *widget = GTK_WIDGET (viewport);
 317   GtkAllocation allocation;
 318   GtkStyleContext *context;
 319   GtkStateFlags state;
 320   GtkBorder padding, border;
 321   guint border_width;
 322
 323   gtk_widget_get_allocation (widget, &allocation);
 324   border_width = gtk_container_get_border_width (GTK_CONTAINER (viewport));
 325
 326   view_allocation->x = 0;
 327   view_allocation->y = 0;
 328
 329   context = gtk_widget_get_style_context (widget);
 330   state = gtk_widget_get_state_flags (widget);
 331   gtk_style_context_save (context);
 332   gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME);
 333
 334   gtk_style_context_get_padding (context, state, &padding);
 335   gtk_style_context_get_border (context, state, &border);
 336
 337   gtk_style_context_restore (context);
 338
 339   if (priv->shadow_type != GTK_SHADOW_NONE)
 340     {
 341       view_allocation->x = border.left;
 342       view_allocation->y = border.top;
 343     }
 344
 345   view_allocation->x += padding.left;
 346   view_allocation->y += padding.top;
 347   view_allocation->width = MAX (1, allocation.width - padding.left - padding.right - border_width * 2);
 348   view_allocation->height = MAX (1, allocation.height - padding.top - padding.bottom - border_width * 2);
 349
 350   if (priv->shadow_type != GTK_SHADOW_NONE)
 351     {
 352       view_allocation->width = MAX (1, view_allocation->width - border.left - border.right);
 353       view_allocation->height = MAX (1, view_allocation->height - border.top - border.bottom);
 354     }
 355 }
 356
 357 /**
 358  * gtk_viewport_get_hadjustment:
 359  * @viewport: a #GtkViewport.
 360  *
 361  * Returns the horizontal adjustment of the viewport.
 362  *
 363  * Return value: (transfer none): the horizontal adjustment of @viewport.
 364  *
 365  * Deprecated: 3.0: Use gtk_scrollable_get_hadjustment()
 366  **/
 367 GtkAdjustment*
 368 gtk_viewport_get_hadjustment (GtkViewport *viewport)
 369 {
 370   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 371
 372   return viewport->priv->hadjustment;
 373 }
 374
 375 /**
 376  * gtk_viewport_get_vadjustment:
 377  * @viewport: a #GtkViewport.
 378  *
 379  * Returns the vertical adjustment of the viewport.
 380  *
 381  * Return value: (transfer none): the vertical adjustment of @viewport.
 382  *
 383  * Deprecated: 3.0: Use gtk_scrollable_get_vadjustment()
 384  **/
 385 GtkAdjustment*
 386 gtk_viewport_get_vadjustment (GtkViewport *viewport)
 387 {
 388   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 389
 390   return viewport->priv->vadjustment;
 391 }
 392
 393 static void
 394 viewport_set_hadjustment_values (GtkViewport *viewport)
 395 {
 396   GtkBin *bin = GTK_BIN (viewport);
 397   GtkAllocation view_allocation;
 398   GtkAdjustment *hadjustment = viewport->priv->hadjustment;
 399   GtkWidget *child;
 400   gdouble upper, value;
 401
 402   viewport_get_view_allocation (viewport, &view_allocation);
 403
 404   child = gtk_bin_get_child (bin);
 405   if (child && gtk_widget_get_visible (child))
 406     {
 407       gint minimum_width, natural_width;
 408       gint scroll_height;
 409
 410       if (viewport->priv->vscroll_policy == GTK_SCROLL_MINIMUM)
 411         gtk_widget_get_preferred_height (child, &scroll_height, NULL);
 412       else
 413         gtk_widget_get_preferred_height (child, NULL, &scroll_height);
 414
 415       gtk_widget_get_preferred_width_for_height (child,
 416                                                  MAX (view_allocation.height, scroll_height),
 417                                                  &minimum_width,
 418                                                  &natural_width);
 419
 420       if (viewport->priv->hscroll_policy == GTK_SCROLL_MINIMUM)
 421         upper = MAX (minimum_width, view_allocation.width);
 422       else
 423         upper = MAX (natural_width, view_allocation.width);
 424     }
 425   else
 426     upper = view_allocation.width;
 427
 428   value = gtk_adjustment_get_value (hadjustment);
 429   /* We clamp to the left in RTL mode */
 430   if (gtk_widget_get_direction (GTK_WIDGET (viewport)) == GTK_TEXT_DIR_RTL)
 431     {
 432       gdouble dist = gtk_adjustment_get_upper (hadjustment)
 433                      - value
 434                      - gtk_adjustment_get_page_size (hadjustment);
 435       value = upper - dist - view_allocation.width;
 436     }
 437
 438   gtk_adjustment_configure (hadjustment,
 439                             value,
 440                             0,
 441                             upper,
 442                             view_allocation.width * 0.1,
 443                             view_allocation.width * 0.9,
 444                             view_allocation.width);
 445 }
 446
 447 static void
 448 viewport_set_vadjustment_values (GtkViewport *viewport)
 449 {
 450   GtkBin *bin = GTK_BIN (viewport);
 451   GtkAllocation view_allocation;
 452   GtkAdjustment *vadjustment = viewport->priv->vadjustment;
 453   GtkWidget *child;
 454   gdouble upper;
 455
 456   viewport_get_view_allocation (viewport, &view_allocation);
 457
 458   child = gtk_bin_get_child (bin);
 459   if (child && gtk_widget_get_visible (child))
 460     {
 461       gint minimum_height, natural_height;
 462       gint scroll_width;
 463
 464       if (viewport->priv->hscroll_policy == GTK_SCROLL_MINIMUM)
 465         gtk_widget_get_preferred_width (child, &scroll_width, NULL);
 466       else
 467         gtk_widget_get_preferred_width (child, NULL, &scroll_width);
 468
 469       gtk_widget_get_preferred_height_for_width (child,
 470                                                  MAX (view_allocation.width, scroll_width),
 471                                                  &minimum_height,
 472                                                  &natural_height);
 473
 474       if (viewport->priv->vscroll_policy == GTK_SCROLL_MINIMUM)
 475         upper = MAX (minimum_height, view_allocation.height);
 476       else
 477         upper = MAX (natural_height, view_allocation.height);
 478     }
 479   else
 480     upper = view_allocation.height;
 481
 482   gtk_adjustment_configure (vadjustment,
 483                             gtk_adjustment_get_value (vadjustment),
 484                             0,
 485                             upper,
 486                             view_allocation.height * 0.1,
 487                             view_allocation.height * 0.9,
 488                             view_allocation.height);
 489 }
 490
 491 static void
 492 viewport_set_adjustment (GtkViewport    *viewport,
 493                          GtkOrientation  orientation,
 494                          GtkAdjustment  *adjustment)
 495 {
 496   GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
 497
 498   if (adjustment && adjustment == *adjustmentp)
 499     return;
 500
 501   if (!adjustment)
 502     adjustment = gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
 503   viewport_disconnect_adjustment (viewport, orientation);
 504   *adjustmentp = adjustment;
 505   g_object_ref_sink (adjustment);
 506
 507   if (orientation == GTK_ORIENTATION_HORIZONTAL)
 508     viewport_set_hadjustment_values (viewport);
 509   else
 510     viewport_set_vadjustment_values (viewport);
 511
 512   g_signal_connect (adjustment, "value-changed",
 513                     G_CALLBACK (gtk_viewport_adjustment_value_changed),
 514                     viewport);
 515
 516   gtk_viewport_adjustment_value_changed (adjustment, viewport);
 517 }
 518
 519 /**
 520  * gtk_viewport_set_hadjustment:
 521  * @viewport: a #GtkViewport.
 522  * @adjustment: (allow-none): a #GtkAdjustment.
 523  *
 524  * Sets the horizontal adjustment of the viewport.
 525  *
 526  * Deprecated: 3.0: Use gtk_scrollable_set_hadjustment()
 527  **/
 528 void
 529 gtk_viewport_set_hadjustment (GtkViewport   *viewport,
 530                               GtkAdjustment *adjustment)
 531 {
 532   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 533   if (adjustment)
 534     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 535
 536   viewport_set_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL, adjustment);
 537
 538   g_object_notify (G_OBJECT (viewport), "hadjustment");
 539 }
 540
 541 /**
 542  * gtk_viewport_set_vadjustment:
 543  * @viewport: a #GtkViewport.
 544  * @adjustment: (allow-none): a #GtkAdjustment.
 545  *
 546  * Sets the vertical adjustment of the viewport.
 547  *
 548  * Deprecated: 3.0: Use gtk_scrollable_set_vadjustment()
 549  **/
 550 void
 551 gtk_viewport_set_vadjustment (GtkViewport   *viewport,
 552                               GtkAdjustment *adjustment)
 553 {
 554   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 555   if (adjustment)
 556     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 557
 558   viewport_set_adjustment (viewport, GTK_ORIENTATION_VERTICAL, adjustment);
 559
 560   g_object_notify (G_OBJECT (viewport), "vadjustment");
 561 }
 562
 563 /**
 564  * gtk_viewport_set_shadow_type:
 565  * @viewport: a #GtkViewport.
 566  * @type: the new shadow type.
 567  *
 568  * Sets the shadow type of the viewport.
 569  **/
 570 void
 571 gtk_viewport_set_shadow_type (GtkViewport   *viewport,
 572                               GtkShadowType  type)
 573 {
 574   GtkViewportPrivate *priv;
 575   GtkAllocation allocation;
 576   GtkWidget *widget;
 577
 578   g_return_if_fail (GTK_IS_VIEWPORT (viewport));
 579
 580   widget = GTK_WIDGET (viewport);
 581   priv = viewport->priv;
 582
 583   if ((GtkShadowType) priv->shadow_type != type)
 584     {
 585       priv->shadow_type = type;
 586
 587       if (gtk_widget_get_visible (widget))
 588         {
 589           gtk_widget_get_allocation (widget, &allocation);
 590           gtk_widget_size_allocate (widget, &allocation);
 591           gtk_widget_set_allocation (widget, &allocation);
 592           gtk_widget_queue_draw (widget);
 593         }
 594
 595       g_object_notify (G_OBJECT (viewport), "shadow-type");
 596     }
 597 }
 598
 599 /**
 600  * gtk_viewport_get_shadow_type:
 601  * @viewport: a #GtkViewport
 602  *
 603  * Gets the shadow type of the #GtkViewport. See
 604  * gtk_viewport_set_shadow_type().
 605  *
 606  * Return value: the shadow type
 607  **/
 608 GtkShadowType
 609 gtk_viewport_get_shadow_type (GtkViewport *viewport)
 610 {
 611   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), GTK_SHADOW_NONE);
 612
 613   return viewport->priv->shadow_type;
 614 }
 615
 616 /**
 617  * gtk_viewport_get_bin_window:
 618  * @viewport: a #GtkViewport
 619  *
 620  * Gets the bin window of the #GtkViewport.
 621  *
 622  * Return value: (transfer none): a #GdkWindow
 623  *
 624  * Since: 2.20
 625  **/
 626 GdkWindow*
 627 gtk_viewport_get_bin_window (GtkViewport *viewport)
 628 {
 629   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 630
 631   return viewport->priv->bin_window;
 632 }
 633
 634 /**
 635  * gtk_viewport_get_view_window:
 636  * @viewport: a #GtkViewport
 637  *
 638  * Gets the view window of the #GtkViewport.
 639  *
 640  * Return value: (transfer none): a #GdkWindow
 641  *
 642  * Since: 2.22
 643  **/
 644 GdkWindow*
 645 gtk_viewport_get_view_window (GtkViewport *viewport)
 646 {
 647   g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
 648
 649   return viewport->priv->view_window;
 650 }
 651
 652 static void
 653 gtk_viewport_realize (GtkWidget *widget)
 654 {
 655   GtkViewport *viewport = GTK_VIEWPORT (widget);
 656   GtkViewportPrivate *priv = viewport->priv;
 657   GtkBin *bin = GTK_BIN (widget);
 658   GtkAdjustment *hadjustment = priv->hadjustment;
 659   GtkAdjustment *vadjustment = priv->vadjustment;
 660   GtkAllocation allocation;
 661   GtkAllocation view_allocation;
 662   GtkStyleContext *context;
 663   GtkWidget *child;
 664   GdkWindow *window;
 665   GdkWindowAttr attributes;
 666   gint attributes_mask;
 667   gint event_mask;
 668   guint border_width;
 669
 670   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
 671
 672   gtk_widget_set_realized (widget, TRUE);
 673
 674   gtk_widget_get_allocation (widget, &allocation);
 675
 676   attributes.x = allocation.x + border_width;
 677   attributes.y = allocation.y + border_width;
 678   attributes.width = allocation.width - border_width * 2;
 679   attributes.height = allocation.height - border_width * 2;
 680   attributes.window_type = GDK_WINDOW_CHILD;
 681   attributes.wclass = GDK_INPUT_OUTPUT;
 682   attributes.visual = gtk_widget_get_visual (widget);
 683
 684   event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 685
 686   attributes.event_mask = event_mask | GDK_SCROLL_MASK | GDK_TOUCH_MASK | GDK_SMOOTH_SCROLL_MASK;
 687
 688   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
 689
 690   window = gdk_window_new (gtk_widget_get_parent_window (widget),
 691                            &attributes, attributes_mask);
 692   gtk_widget_set_window (widget, window);
 693   gtk_widget_register_window (widget, window);
 694
 695   viewport_get_view_allocation (viewport, &view_allocation);
 696
 697   attributes.x = view_allocation.x;
 698   attributes.y = view_allocation.y;
 699   attributes.width = view_allocation.width;
 700   attributes.height = view_allocation.height;
 701   attributes.event_mask = 0;
 702
 703   priv->view_window = gdk_window_new (window,
 704                                       &attributes, attributes_mask);
 705   gtk_widget_register_window (widget, priv->view_window);
 706
 707   attributes.x = - gtk_adjustment_get_value (hadjustment);
 708   attributes.y = - gtk_adjustment_get_value (vadjustment);
 709   attributes.width = gtk_adjustment_get_upper (hadjustment);
 710   attributes.height = gtk_adjustment_get_upper (vadjustment);
 711
 712   attributes.event_mask = event_mask;
 713
 714   priv->bin_window = gdk_window_new (priv->view_window, &attributes, attributes_mask);
 715   gtk_widget_register_window (widget, priv->bin_window);
 716
 717   child = gtk_bin_get_child (bin);
 718   if (child)
 719     gtk_widget_set_parent_window (child, priv->bin_window);
 720
 721   context = gtk_widget_get_style_context (widget);
 722   gtk_style_context_set_background (context, window);
 723   gtk_style_context_set_background (context, priv->bin_window);
 724
 725   gdk_window_show (priv->bin_window);
 726   gdk_window_show (priv->view_window);
 727 }
 728
 729 static void
 730 gtk_viewport_unrealize (GtkWidget *widget)
 731 {
 732   GtkViewport *viewport = GTK_VIEWPORT (widget);
 733   GtkViewportPrivate *priv = viewport->priv;
 734
 735   gtk_widget_unregister_window (widget, priv->view_window);
 736   gdk_window_destroy (priv->view_window);
 737   priv->view_window = NULL;
 738
 739   gtk_widget_unregister_window (widget, priv->bin_window);
 740   gdk_window_destroy (priv->bin_window);
 741   priv->bin_window = NULL;
 742
 743   GTK_WIDGET_CLASS (gtk_viewport_parent_class)->unrealize (widget);
 744 }
 745
 746 static gint
 747 gtk_viewport_draw (GtkWidget *widget,
 748                    cairo_t   *cr)
 749 {
 750   GtkViewport *viewport = GTK_VIEWPORT (widget);
 751   GtkViewportPrivate *priv = viewport->priv;
 752   GtkStyleContext *context;
 753   int x, y;
 754
 755   context = gtk_widget_get_style_context (widget);
 756
 757   if (gtk_cairo_should_draw_window (cr, gtk_widget_get_window (widget)) &&
 758       priv->shadow_type != GTK_SHADOW_NONE)
 759     {
 760       gtk_style_context_save (context);
 761       gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME);
 762
 763       gtk_render_frame (context, cr, 0, 0,
 764                         gdk_window_get_width (gtk_widget_get_window (widget)),
 765                         gdk_window_get_height (gtk_widget_get_window (widget)));
 766
 767       gtk_style_context_restore (context);
 768     }
 769
 770   if (gtk_cairo_should_draw_window (cr, priv->view_window))
 771     {
 772       /* This is a cute hack to ensure the contents of bin_window are
 773        * restricted to where they are visible. We only need to do this
 774        * clipping when called via gtk_widget_draw() and not in expose
 775        * events. And when that happens every window (including this one)
 776        * should be drawn.
 777        */
 778       gdk_window_get_position (priv->view_window, &x, &y);
 779       cairo_rectangle (cr, x, y,
 780                        gdk_window_get_width (priv->view_window),
 781                        gdk_window_get_height (priv->view_window));
 782       cairo_clip (cr);
 783     }
 784
 785   if (gtk_cairo_should_draw_window (cr, priv->bin_window))
 786     {
 787       gdk_window_get_position (priv->bin_window, &x, &y);
 788       gtk_render_background (context, cr, x, y,
 789                              gdk_window_get_width (priv->bin_window),
 790                              gdk_window_get_height (priv->bin_window));
 791
 792       GTK_WIDGET_CLASS (gtk_viewport_parent_class)->draw (widget, cr);
 793     }
 794
 795   return FALSE;
 796 }
 797
 798 static void
 799 gtk_viewport_add (GtkContainer *container,
 800                   GtkWidget    *child)
 801 {
 802   GtkBin *bin = GTK_BIN (container);
 803   GtkViewport *viewport = GTK_VIEWPORT (bin);
 804   GtkViewportPrivate *priv = viewport->priv;
 805
 806   g_return_if_fail (gtk_bin_get_child (bin) == NULL);
 807
 808   gtk_widget_set_parent_window (child, priv->bin_window);
 809
 810   GTK_CONTAINER_CLASS (gtk_viewport_parent_class)->add (container, child);
 811 }
 812
 813 static void
 814 gtk_viewport_size_allocate (GtkWidget     *widget,
 815                             GtkAllocation *allocation)
 816 {
 817   GtkAllocation widget_allocation;
 818   GtkViewport *viewport = GTK_VIEWPORT (widget);
 819   GtkViewportPrivate *priv = viewport->priv;
 820   GtkBin *bin = GTK_BIN (widget);
 821   guint border_width;
 822   GtkAdjustment *hadjustment = priv->hadjustment;
 823   GtkAdjustment *vadjustment = priv->vadjustment;
 824   GtkAllocation child_allocation;
 825   GtkWidget *child;
 826
 827   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
 828
 829   /* If our size changed, and we have a shadow, queue a redraw on widget->window to
 830    * redraw the shadow correctly.
 831    */
 832   gtk_widget_get_allocation (widget, &widget_allocation);
 833   if (gtk_widget_get_mapped (widget) &&
 834       priv->shadow_type != GTK_SHADOW_NONE &&
 835       (widget_allocation.width != allocation->width ||
 836        widget_allocation.height != allocation->height))
 837     gdk_window_invalidate_rect (gtk_widget_get_window (widget), NULL, FALSE);
 838
 839   gtk_widget_set_allocation (widget, allocation);
 840
 841   g_object_freeze_notify (G_OBJECT (hadjustment));
 842   g_object_freeze_notify (G_OBJECT (vadjustment));
 843
 844   viewport_set_hadjustment_values (viewport);
 845   viewport_set_vadjustment_values (viewport);
 846
 847   child_allocation.x = 0;
 848   child_allocation.y = 0;
 849   child_allocation.width = gtk_adjustment_get_upper (hadjustment);
 850   child_allocation.height = gtk_adjustment_get_upper (vadjustment);
 851   if (gtk_widget_get_realized (widget))
 852     {
 853       GtkAllocation view_allocation;
 854
 855       gdk_window_move_resize (gtk_widget_get_window (widget),
 856                               allocation->x + border_width,
 857                               allocation->y + border_width,
 858                               allocation->width - border_width * 2,
 859                               allocation->height - border_width * 2);
 860
 861       viewport_get_view_allocation (viewport, &view_allocation);
 862       gdk_window_move_resize (priv->view_window,
 863                               view_allocation.x,
 864                               view_allocation.y,
 865                               view_allocation.width,
 866                               view_allocation.height);
 867       gdk_window_move_resize (priv->bin_window,
 868                               - gtk_adjustment_get_value (hadjustment),
 869                               - gtk_adjustment_get_value (vadjustment),
 870                               child_allocation.width,
 871                               child_allocation.height);
 872     }
 873
 874   child = gtk_bin_get_child (bin);
 875   if (child && gtk_widget_get_visible (child))
 876     gtk_widget_size_allocate (child, &child_allocation);
 877
 878   g_object_thaw_notify (G_OBJECT (hadjustment));
 879   g_object_thaw_notify (G_OBJECT (vadjustment));
 880 }
 881
 882 static void
 883 gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
 884                                        gpointer       data)
 885 {
 886   GtkViewport *viewport = GTK_VIEWPORT (data);
 887   GtkViewportPrivate *priv = viewport->priv;
 888   GtkBin *bin = GTK_BIN (data);
 889   GtkWidget *child;
 890
 891   child = gtk_bin_get_child (bin);
 892   if (child && gtk_widget_get_visible (child) &&
 893       gtk_widget_get_realized (GTK_WIDGET (viewport)))
 894     {
 895       GtkAdjustment *hadjustment = priv->hadjustment;
 896       GtkAdjustment *vadjustment = priv->vadjustment;
 897       gint old_x, old_y;
 898       gint new_x, new_y;
 899
 900       gdk_window_get_position (priv->bin_window, &old_x, &old_y);
 901       new_x = - gtk_adjustment_get_value (hadjustment);
 902       new_y = - gtk_adjustment_get_value (vadjustment);
 903
 904       if (new_x != old_x || new_y != old_y)
 905         gdk_window_move (priv->bin_window, new_x, new_y);
 906     }
 907 }
 908
 909 static void
 910 gtk_viewport_style_updated (GtkWidget *widget)
 911 {
 912    GTK_WIDGET_CLASS (gtk_viewport_parent_class)->style_updated (widget);
 913
 914    if (gtk_widget_get_realized (widget) &&
 915        gtk_widget_get_has_window (widget))
 916      {
 917         GtkStyleContext *context;
 918         GtkViewport *viewport = GTK_VIEWPORT (widget);
 919         GtkViewportPrivate *priv = viewport->priv;
 920
 921         context = gtk_widget_get_style_context (widget);
 922         gtk_style_context_set_background (context, priv->bin_window);
 923         gtk_style_context_set_background (context, gtk_widget_get_window (widget));
 924      }
 925 }
 926
 927
 928 static void
 929 gtk_viewport_get_preferred_size (GtkWidget      *widget,
 930                                  GtkOrientation  orientation,
 931                                  gint           *minimum_size,
 932                                  gint           *natural_size)
 933 {
 934   GtkViewport *viewport = GTK_VIEWPORT (widget);
 935   GtkViewportPrivate *priv = viewport->priv;
 936   GtkStyleContext *context;
 937   GtkStateFlags state;
 938   GtkBorder padding, border;
 939   GtkWidget *child;
 940   gint       child_min, child_nat;
 941   gint       minimum, natural;
 942
 943   child = gtk_bin_get_child (GTK_BIN (widget));
 944
 945   /* XXX This should probably be (border_width * 2); but GTK+ has
 946    * been doing this with a single border for a while now...
 947    */
 948   minimum = gtk_container_get_border_width (GTK_CONTAINER (widget));
 949
 950   context = gtk_widget_get_style_context (GTK_WIDGET (widget));
 951   state = gtk_widget_get_state_flags (GTK_WIDGET (widget));
 952   gtk_style_context_get_padding (context, state, &padding);
 953
 954   if (priv->shadow_type != GTK_SHADOW_NONE)
 955     {
 956       gtk_style_context_get_border (context, state, &border);
 957
 958       if (orientation == GTK_ORIENTATION_HORIZONTAL)
 959         minimum += border.left + border.right;
 960       else
 961         minimum += border.top + border.bottom;
 962     }
 963
 964   if (orientation == GTK_ORIENTATION_HORIZONTAL)
 965     minimum += padding.left + padding.right;
 966   else
 967     minimum += padding.top + padding.bottom;
 968
 969   natural = minimum;
 970
 971   if (child && gtk_widget_get_visible (child))
 972     {
 973       if (orientation == GTK_ORIENTATION_HORIZONTAL)
 974         gtk_widget_get_preferred_width (child, &child_min, &child_nat);
 975       else
 976         gtk_widget_get_preferred_height (child, &child_min, &child_nat);
 977
 978       minimum += child_min;
 979       natural += child_nat;
 980     }
 981
 982   if (minimum_size)
 983     *minimum_size = minimum;
 984
 985   if (natural_size)
 986     *natural_size = natural;
 987 }
 988
 989 static void
 990 gtk_viewport_get_preferred_width (GtkWidget *widget,
 991                                   gint      *minimum_size,
 992                                   gint      *natural_size)
 993 {
 994   gtk_viewport_get_preferred_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
 995 }
 996
 997 static void
 998 gtk_viewport_get_preferred_height (GtkWidget *widget,
 999                                    gint      *minimum_size,
1000                                    gint      *natural_size)
1001 {
1002   gtk_viewport_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
1003 }