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/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/

/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/

#include "config.h"

#include <math.h>

#include "gtkbindings.h"
#include "gtkmarshalers.h"
#include "gtkscrollable.h"
#include "gtkscrollbar.h"
#include "gtkscrolledwindow.h"
#include "gtkwindow.h"
#include "gtkprivate.h"
#include "gtktypebuiltins.h"
#include "gtkintl.h"
#include "a11y/gtkscrolledwindowaccessible.h"

/**
* SECTION:gtkscrolledwindow
* @Short_description: Adds scrollbars to its child widget
* @Title: GtkScrolledWindow
* @See_also: #GtkScrollable, #GtkViewport, #GtkAdjustment
*
* #GtkScrolledWindow is a #GtkBin subclass: it's a container
* the accepts a single child widget. #GtkScrolledWindow adds scrollbars
* to the child widget and optionally draws a beveled frame around the
* child widget.
*
* The scrolled window can work in two ways. Some widgets have native
* scrolling support; these widgets implement the #GtkScrollable interface.
* Widgets with native scroll support include #GtkTreeView, #GtkTextView,
* and #GtkLayout.
*
* For widgets that lack native scrolling support, the #GtkViewport
* widget acts as an adaptor class, implementing scrollability for child
* widgets that lack their own scrolling capabilities. Use #GtkViewport
* to scroll child widgets such as #GtkTable, #GtkBox, and so on.
*
* If a widget has native scrolling abilities, it can be added to the
* #GtkScrolledWindow with gtk_container_add(). If a widget does not, you
* must first add the widget to a #GtkViewport, then add the #GtkViewport
* to the scrolled window. The convenience function
* gtk_scrolled_window_add_with_viewport() does exactly this, so you can
* ignore the presence of the viewport.
*
* The position of the scrollbars is controlled by the scroll
* adjustments. See #GtkAdjustment for the fields in an adjustment - for
* #GtkScrollbar, used by #GtkScrolledWindow, the "value" field
* represents the position of the scrollbar, which must be between the
* "lower" field and "upper - page_size." The "page_size" field
* represents the size of the visible scrollable area. The
* "step_increment" and "page_increment" fields are used when the user
* asks to step down (using the small stepper arrows) or page down (using
* for example the PageDown key).
*
* If a #GtkScrolledWindow doesn't behave quite as you would like, or
* doesn't have exactly the right layout, it's very possible to set up
* your own scrolling with #GtkScrollbar and for example a #GtkTable.
*/


/* scrolled window policy and size requisition handling:
*
* gtk size requisition works as follows:
* a widget upon size-request reports the width and height that it finds
* to be best suited to display its contents, including children.
* the width and/or height reported from a widget upon size requisition
* may be overidden by the user by specifying a width and/or height
* other than 0 through gtk_widget_set_size_request().
*
* a scrolled window needs (for implementing all three policy types) to
* request its width and height based on two different rationales.
* 1) the user wants the scrolled window to just fit into the space
* that it gets allocated for a specifc dimension.
* 1.1) this does not apply if the user specified a concrete value
* value for that specific dimension by either specifying usize for the
* scrolled window or for its child.
* 2) the user wants the scrolled window to take as much space up as
* is desired by the child for a specifc dimension (i.e. POLICY_NEVER).
*
* also, kinda obvious:
* 3) a user would certainly not have choosen a scrolled window as a container
* for the child, if the resulting allocation takes up more space than the
* child would have allocated without the scrolled window.
*
* conclusions:
* A) from 1) follows: the scrolled window shouldn't request more space for a
* specifc dimension than is required at minimum.
* B) from 1.1) follows: the requisition may be overidden by usize of the scrolled
* window (done automatically) or by usize of the child (needs to be checked).
* C) from 2) follows: for POLICY_NEVER, the scrolled window simply reports the
* child's dimension.
* D) from 3) follows: the scrolled window child's minimum width and minimum height
* under A) at least correspond to the space taken up by its scrollbars.
*/

#define DEFAULT_SCROLLBAR_SPACING 3

struct _GtkScrolledWindowPrivate
{
  GtkWidget *hscrollbar;
  GtkWidget *vscrollbar;

  GtkCornerType real_window_placement;
  guint16 shadow_type;

  guint window_placement_set : 1;
  guint hscrollbar_policy : 2;
  guint vscrollbar_policy : 2;
  guint hscrollbar_visible : 1;
  guint vscrollbar_visible : 1;
  guint window_placement : 2;
  guint focus_out : 1; /* Flag used by ::move-focus-out implementation */

  gint min_content_width;
  gint min_content_height;
};


enum {
  PROP_0,
  PROP_HADJUSTMENT,
  PROP_VADJUSTMENT,
  PROP_HSCROLLBAR_POLICY,
  PROP_VSCROLLBAR_POLICY,
  PROP_WINDOW_PLACEMENT,
  PROP_WINDOW_PLACEMENT_SET,
  PROP_SHADOW_TYPE,
  PROP_MIN_CONTENT_WIDTH,
  PROP_MIN_CONTENT_HEIGHT
};

/* Signals */
enum
{
  SCROLL_CHILD,
  MOVE_FOCUS_OUT,
  LAST_SIGNAL
};

static void gtk_scrolled_window_set_property (GObject *object,
                                                        guint prop_id,
                                                        const GValue *value,
                                                        GParamSpec *pspec);
static void gtk_scrolled_window_get_property (GObject *object,
                                                        guint prop_id,
                                                        GValue *value,
                                                        GParamSpec *pspec);

static void gtk_scrolled_window_destroy (GtkWidget *widget);
static void gtk_scrolled_window_screen_changed (GtkWidget *widget,
                                                        GdkScreen *previous_screen);
static gboolean gtk_scrolled_window_draw (GtkWidget *widget,
                                                        cairo_t *cr);
static void gtk_scrolled_window_size_allocate (GtkWidget *widget,
                                                        GtkAllocation *allocation);
static gboolean gtk_scrolled_window_scroll_event (GtkWidget *widget,
                                                        GdkEventScroll *event);
static gboolean gtk_scrolled_window_focus (GtkWidget *widget,
                                                        GtkDirectionType direction);
static void gtk_scrolled_window_add (GtkContainer *container,
                                                        GtkWidget *widget);
static void gtk_scrolled_window_remove (GtkContainer *container,
                                                        GtkWidget *widget);
static void gtk_scrolled_window_forall (GtkContainer *container,
                                                        gboolean include_internals,
                                                        GtkCallback callback,
                                                        gpointer callback_data);
static gboolean gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
                                                        GtkScrollType scroll,
                                                        gboolean horizontal);
static void gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
                                                        GtkDirectionType direction_type);

static void gtk_scrolled_window_relative_allocation(GtkWidget *widget,
                                                        GtkAllocation *allocation);
static void gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
                                                        gpointer data);

static void gtk_scrolled_window_update_real_placement (GtkScrolledWindow *scrolled_window);

static void gtk_scrolled_window_get_preferred_width (GtkWidget *widget,
gint *minimum_size,
gint *natural_size);
static void gtk_scrolled_window_get_preferred_height (GtkWidget *widget,
gint *minimum_size,
gint *natural_size);
static void gtk_scrolled_window_get_preferred_height_for_width (GtkWidget *layout,
gint width,
gint *minimum_height,
gint *natural_height);
static void gtk_scrolled_window_get_preferred_width_for_height (GtkWidget *layout,
gint width,
gint *minimum_height,
gint *natural_height);

static guint signals[LAST_SIGNAL] = {0};

G_DEFINE_TYPE (GtkScrolledWindow, gtk_scrolled_window, GTK_TYPE_BIN)


static void
add_scroll_binding (GtkBindingSet *binding_set,
guint keyval,
GdkModifierType mask,
GtkScrollType scroll,
gboolean horizontal)
{
  guint keypad_keyval = keyval - GDK_KEY_Left + GDK_KEY_KP_Left;
  
  gtk_binding_entry_add_signal (binding_set, keyval, mask,
                                "scroll-child", 2,
                                GTK_TYPE_SCROLL_TYPE, scroll,
G_TYPE_BOOLEAN, horizontal);
  gtk_binding_entry_add_signal (binding_set, keypad_keyval, mask,
                                "scroll-child", 2,
                                GTK_TYPE_SCROLL_TYPE, scroll,
G_TYPE_BOOLEAN, horizontal);
}

static void
add_tab_bindings (GtkBindingSet *binding_set,
GdkModifierType modifiers,
GtkDirectionType direction)
{
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_Tab, modifiers,
                                "move-focus-out", 1,
                                GTK_TYPE_DIRECTION_TYPE, direction);
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Tab, modifiers,
                                "move-focus-out", 1,
                                GTK_TYPE_DIRECTION_TYPE, direction);
}

static void
gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (class);
  GtkWidgetClass *widget_class;
  GtkContainerClass *container_class;
  GtkBindingSet *binding_set;

  widget_class = (GtkWidgetClass*) class;
  container_class = (GtkContainerClass*) class;

  gobject_class->set_property = gtk_scrolled_window_set_property;
  gobject_class->get_property = gtk_scrolled_window_get_property;

  widget_class->destroy = gtk_scrolled_window_destroy;
  widget_class->screen_changed = gtk_scrolled_window_screen_changed;
  widget_class->draw = gtk_scrolled_window_draw;
  widget_class->size_allocate = gtk_scrolled_window_size_allocate;
  widget_class->scroll_event = gtk_scrolled_window_scroll_event;
  widget_class->focus = gtk_scrolled_window_focus;
  widget_class->get_preferred_width = gtk_scrolled_window_get_preferred_width;
  widget_class->get_preferred_height = gtk_scrolled_window_get_preferred_height;
  widget_class->get_preferred_height_for_width = gtk_scrolled_window_get_preferred_height_for_width;
  widget_class->get_preferred_width_for_height = gtk_scrolled_window_get_preferred_width_for_height;

  container_class->add = gtk_scrolled_window_add;
  container_class->remove = gtk_scrolled_window_remove;
  container_class->forall = gtk_scrolled_window_forall;
  gtk_container_class_handle_border_width (container_class);

  class->scrollbar_spacing = -1;

  class->scroll_child = gtk_scrolled_window_scroll_child;
  class->move_focus_out = gtk_scrolled_window_move_focus_out;
  
  g_object_class_install_property (gobject_class,
PROP_HADJUSTMENT,
g_param_spec_object ("hadjustment",
P_("Horizontal Adjustment"),
P_("The GtkAdjustment for the horizontal position"),
GTK_TYPE_ADJUSTMENT,
GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
  g_object_class_install_property (gobject_class,
PROP_VADJUSTMENT,
g_param_spec_object ("vadjustment",
P_("Vertical Adjustment"),
P_("The GtkAdjustment for the vertical position"),
GTK_TYPE_ADJUSTMENT,
GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
  g_object_class_install_property (gobject_class,
                                   PROP_HSCROLLBAR_POLICY,
                                   g_param_spec_enum ("hscrollbar-policy",
                                                      P_("Horizontal Scrollbar Policy"),
                                                      P_("When the horizontal scrollbar is displayed"),
GTK_TYPE_POLICY_TYPE,
GTK_POLICY_AUTOMATIC,
                                                      GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
  g_object_class_install_property (gobject_class,
                                   PROP_VSCROLLBAR_POLICY,
                                   g_param_spec_enum ("vscrollbar-policy",
                                                      P_("Vertical Scrollbar Policy"),
                                                      P_("When the vertical scrollbar is displayed"),
GTK_TYPE_POLICY_TYPE,
GTK_POLICY_AUTOMATIC,
                                                      GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));

  g_object_class_install_property (gobject_class,
                                   PROP_WINDOW_PLACEMENT,
                                   g_param_spec_enum ("window-placement",
                                                      P_("Window Placement"),
                                                      P_("Where the contents are located with respect to the scrollbars. This property only takes effect if \"window-placement-set\" is TRUE."),
GTK_TYPE_CORNER_TYPE,
GTK_CORNER_TOP_LEFT,
                                                      GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
  
  /**
* GtkScrolledWindow:window-placement-set:
*
* Whether "window-placement" should be used to determine the location
* of the contents with respect to the scrollbars. Otherwise, the
* "gtk-scrolled-window-placement" setting is used.
*
* Since: 2.10
*/
  g_object_class_install_property (gobject_class,
                                   PROP_WINDOW_PLACEMENT_SET,
                                   g_param_spec_boolean ("window-placement-set",
P_("Window Placement Set"),
P_("Whether \"window-placement\" should be used to determine the location of the contents with respect to the scrollbars."),
FALSE,
GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
  g_object_class_install_property (gobject_class,
                                   PROP_SHADOW_TYPE,
                                   g_param_spec_enum ("shadow-type",
                                                      P_("Shadow Type"),
                                                      P_("Style of bevel around the contents"),
GTK_TYPE_SHADOW_TYPE,
GTK_SHADOW_NONE,
                                                      GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));

  /**
* GtkScrolledWindow:scrollbars-within-bevel:
*
* Whether to place scrollbars within the scrolled window's bevel.
*
* Since: 2.12
*/
  gtk_widget_class_install_style_property (widget_class,
g_param_spec_boolean ("scrollbars-within-bevel",
P_("Scrollbars within bevel"),
P_("Place scrollbars within the scrolled window's bevel"),
FALSE,
GTK_PARAM_READABLE));

  gtk_widget_class_install_style_property (widget_class,
g_param_spec_int ("scrollbar-spacing",
P_("Scrollbar spacing"),
P_("Number of pixels between the scrollbars and the scrolled window"),
0,
G_MAXINT,
DEFAULT_SCROLLBAR_SPACING,
GTK_PARAM_READABLE));

  /**
* GtkScrolledWindow:min-content-width:
*
* The minimum content width of @scrolled_window, or -1 if not set.
*
* Since: 3.0
*/
  g_object_class_install_property (gobject_class,
                                   PROP_MIN_CONTENT_WIDTH,
                                   g_param_spec_int ("min-content-width",
                                                     P_("Minimum Content Width"),
                                                     P_("The minimum width that the scrolled window will allocate to its content"),
                                                     -1, G_MAXINT, -1,
                                                     GTK_PARAM_READWRITE));

  /**
* GtkScrolledWindow:min-content-height:
*
* The minimum content height of @scrolled_window, or -1 if not set.
*
* Since: 3.0
*/
  g_object_class_install_property (gobject_class,
                                   PROP_MIN_CONTENT_HEIGHT,
                                   g_param_spec_int ("min-content-height",
                                                     P_("Minimum Content Height"),
                                                     P_("The minimum height that the scrolled window will allocate to its content"),
                                                     -1, G_MAXINT, -1,
                                                     GTK_PARAM_READWRITE));
  /**
* GtkScrolledWindow::scroll-child:
* @scrolled_window: a #GtkScrolledWindow
* @scroll: a #GtkScrollType describing how much to scroll
* @horizontal: whether the keybinding scrolls the child
* horizontally or not
*
* The ::scroll-child signal is a
* <link linkend="keybinding-signals">keybinding signal</link>
* which gets emitted when a keybinding that scrolls is pressed.
* The horizontal or vertical adjustment is updated which triggers a
* signal that the scrolled windows child may listen to and scroll itself.
*/
  signals[SCROLL_CHILD] =
    g_signal_new (I_("scroll-child"),
                  G_TYPE_FROM_CLASS (gobject_class),
                  G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
                  G_STRUCT_OFFSET (GtkScrolledWindowClass, scroll_child),
                  NULL, NULL,
                  _gtk_marshal_BOOLEAN__ENUM_BOOLEAN,
                  G_TYPE_BOOLEAN, 2,
                  GTK_TYPE_SCROLL_TYPE,
G_TYPE_BOOLEAN);

  /**
* GtkScrolledWindow::move-focus-out:
* @scrolled_window: a #GtkScrolledWindow
* @direction_type: either %GTK_DIR_TAB_FORWARD or
* %GTK_DIR_TAB_BACKWARD
*
* The ::move-focus-out signal is a
* <link linkend="keybinding-signals">keybinding signal</link>
* which gets emitted when focus is moved away from the scrolled
* window by a keybinding.
* The #GtkWidget::move-focus signal is emitted with @direction_type
* on this scrolled windows toplevel parent in the container hierarchy.
* The default bindings for this signal are
* <keycombo><keycap>Tab</keycap><keycap>Ctrl</keycap></keycombo>
* and
* <keycombo><keycap>Tab</keycap><keycap>Ctrl</keycap><keycap>Shift</keycap></keycombo>.
*/
  signals[MOVE_FOCUS_OUT] =
    g_signal_new (I_("move-focus-out"),
                  G_TYPE_FROM_CLASS (gobject_class),
                  G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
                  G_STRUCT_OFFSET (GtkScrolledWindowClass, move_focus_out),
                  NULL, NULL,
                  _gtk_marshal_VOID__ENUM,
                  G_TYPE_NONE, 1,
                  GTK_TYPE_DIRECTION_TYPE);
  
  binding_set = gtk_binding_set_by_class (class);

  add_scroll_binding (binding_set, GDK_KEY_Left, GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
  add_scroll_binding (binding_set, GDK_KEY_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD, TRUE);
  add_scroll_binding (binding_set, GDK_KEY_Up, GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE);
  add_scroll_binding (binding_set, GDK_KEY_Down, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD, FALSE);

  add_scroll_binding (binding_set, GDK_KEY_Page_Up, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
  add_scroll_binding (binding_set, GDK_KEY_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD, TRUE);
  add_scroll_binding (binding_set, GDK_KEY_Page_Up, 0, GTK_SCROLL_PAGE_BACKWARD, FALSE);
  add_scroll_binding (binding_set, GDK_KEY_Page_Down, 0, GTK_SCROLL_PAGE_FORWARD, FALSE);

  add_scroll_binding (binding_set, GDK_KEY_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, TRUE);
  add_scroll_binding (binding_set, GDK_KEY_End, GDK_CONTROL_MASK, GTK_SCROLL_END, TRUE);
  add_scroll_binding (binding_set, GDK_KEY_Home, 0, GTK_SCROLL_START, FALSE);
  add_scroll_binding (binding_set, GDK_KEY_End, 0, GTK_SCROLL_END, FALSE);

  add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
  add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);

  g_type_class_add_private (class, sizeof (GtkScrolledWindowPrivate));

  gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_SCROLLED_WINDOW_ACCESSIBLE);
}

static void
gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
{
  GtkScrolledWindowPrivate *priv;

  scrolled_window->priv = priv = G_TYPE_INSTANCE_GET_PRIVATE (scrolled_window,
                                                              GTK_TYPE_SCROLLED_WINDOW,
                                                              GtkScrolledWindowPrivate);

  gtk_widget_set_has_window (GTK_WIDGET (scrolled_window), FALSE);
  gtk_widget_set_can_focus (GTK_WIDGET (scrolled_window), TRUE);

  priv->hscrollbar = NULL;
  priv->vscrollbar = NULL;
  priv->hscrollbar_policy = GTK_POLICY_AUTOMATIC;
  priv->vscrollbar_policy = GTK_POLICY_AUTOMATIC;
  priv->hscrollbar_visible = FALSE;
  priv->vscrollbar_visible = FALSE;
  priv->focus_out = FALSE;
  priv->window_placement = GTK_CORNER_TOP_LEFT;
  gtk_scrolled_window_update_real_placement (scrolled_window);
  priv->min_content_width = -1;
  priv->min_content_height = -1;
}

/**
* gtk_scrolled_window_new:
* @hadjustment: (allow-none): horizontal adjustment
* @vadjustment: (allow-none): vertical adjustment
*
* Creates a new scrolled window.
*
* The two arguments are the scrolled window's adjustments; these will be
* shared with the scrollbars and the child widget to keep the bars in sync
* with the child. Usually you want to pass %NULL for the adjustments, which
* will cause the scrolled window to create them for you.
*
* Returns: a new scrolled window
*/
GtkWidget*
gtk_scrolled_window_new (GtkAdjustment *hadjustment,
GtkAdjustment *vadjustment)
{
  GtkWidget *scrolled_window;

  if (hadjustment)
    g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL);

  if (vadjustment)
    g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL);

  scrolled_window = g_object_new (GTK_TYPE_SCROLLED_WINDOW,
"hadjustment", hadjustment,
"vadjustment", vadjustment,
NULL);

  return scrolled_window;
}

/**
* gtk_scrolled_window_set_hadjustment:
* @scrolled_window: a #GtkScrolledWindow
* @hadjustment: horizontal scroll adjustment
*
* Sets the #GtkAdjustment for the horizontal scrollbar.
*/
void
gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
GtkAdjustment *hadjustment)
{
  GtkScrolledWindowPrivate *priv;
  GtkBin *bin;
  GtkWidget *child;

  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
  if (hadjustment)
    g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment));
  else
    hadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);

  bin = GTK_BIN (scrolled_window);
  priv = scrolled_window->priv;

  if (!priv->hscrollbar)
    {
      gtk_widget_push_composite_child ();
      priv->hscrollbar = gtk_scrollbar_new (GTK_ORIENTATION_HORIZONTAL, hadjustment);
      gtk_widget_set_composite_name (priv->hscrollbar, "hscrollbar");
      gtk_widget_pop_composite_child ();

      gtk_widget_set_parent (priv->hscrollbar, GTK_WIDGET (scrolled_window));
      g_object_ref (priv->hscrollbar);
      gtk_widget_show (priv->hscrollbar);
    }
  else
    {
      GtkAdjustment *old_adjustment;

      old_adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
      if (old_adjustment == hadjustment)
return;

      g_signal_handlers_disconnect_by_func (old_adjustment,
gtk_scrolled_window_adjustment_changed,
scrolled_window);
      gtk_range_set_adjustment (GTK_RANGE (priv->hscrollbar),
hadjustment);
    }
  hadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
  g_signal_connect (hadjustment,
"changed",
G_CALLBACK (gtk_scrolled_window_adjustment_changed),
scrolled_window);
  gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);

  child = gtk_bin_get_child (bin);
  if (GTK_IS_SCROLLABLE (child))
    gtk_scrollable_set_hadjustment (GTK_SCROLLABLE (child), hadjustment);

  g_object_notify (G_OBJECT (scrolled_window), "hadjustment");
}

/**
* gtk_scrolled_window_set_vadjustment:
* @scrolled_window: a #GtkScrolledWindow
* @vadjustment: vertical scroll adjustment
*
* Sets the #GtkAdjustment for the vertical scrollbar.
*/
void
gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
                                     GtkAdjustment *vadjustment)
{
  GtkScrolledWindowPrivate *priv;
  GtkBin *bin;
  GtkWidget *child;

  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
  if (vadjustment)
    g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
  else
    vadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);

  bin = GTK_BIN (scrolled_window);
  priv = scrolled_window->priv;

  if (!priv->vscrollbar)
    {
      gtk_widget_push_composite_child ();
      priv->vscrollbar = gtk_scrollbar_new (GTK_ORIENTATION_VERTICAL, vadjustment);
      gtk_widget_set_composite_name (priv->vscrollbar, "vscrollbar");
      gtk_widget_pop_composite_child ();

      gtk_widget_set_parent (priv->vscrollbar, GTK_WIDGET (scrolled_window));
      g_object_ref (priv->vscrollbar);
      gtk_widget_show (priv->vscrollbar);
    }
  else
    {
      GtkAdjustment *old_adjustment;
      
      old_adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
      if (old_adjustment == vadjustment)
return;

      g_signal_handlers_disconnect_by_func (old_adjustment,
gtk_scrolled_window_adjustment_changed,
scrolled_window);
      gtk_range_set_adjustment (GTK_RANGE (priv->vscrollbar),
vadjustment);
    }
  vadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
  g_signal_connect (vadjustment,
"changed",
G_CALLBACK (gtk_scrolled_window_adjustment_changed),
scrolled_window);
  gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);

  child = gtk_bin_get_child (bin);
  if (GTK_IS_SCROLLABLE (child))
    gtk_scrollable_set_vadjustment (GTK_SCROLLABLE (child), vadjustment);

  g_object_notify (G_OBJECT (scrolled_window), "vadjustment");
}

/**
* gtk_scrolled_window_get_hadjustment:
* @scrolled_window: a #GtkScrolledWindow
*
* Returns the horizontal scrollbar's adjustment, used to connect the
* horizontal scrollbar to the child widget's horizontal scroll
* functionality.
*
* Returns: (transfer none): the horizontal #GtkAdjustment
*/
GtkAdjustment*
gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
{
  GtkScrolledWindowPrivate *priv;

  g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);

  priv = scrolled_window->priv;

  return (priv->hscrollbar ?
gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)) :
NULL);
}

/**
* gtk_scrolled_window_get_vadjustment:
* @scrolled_window: a #GtkScrolledWindow
*
* Returns the vertical scrollbar's adjustment, used to connect the
* vertical scrollbar to the child widget's vertical scroll functionality.
*
* Returns: (transfer none): the vertical #GtkAdjustment
*/
GtkAdjustment*
gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
{
  GtkScrolledWindowPrivate *priv;

  g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);

  priv = scrolled_window->priv;

  return (priv->vscrollbar ?
gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)) :
NULL);
}

/**
* gtk_scrolled_window_get_hscrollbar:
* @scrolled_window: a #GtkScrolledWindow
*
* Returns the horizontal scrollbar of @scrolled_window.
*
* Returns: (transfer none): the horizontal scrollbar of the scrolled window,
* or %NULL if it does not have one.
*
* Since: 2.8
*/
GtkWidget*
gtk_scrolled_window_get_hscrollbar (GtkScrolledWindow *scrolled_window)
{
  g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);

  return scrolled_window->priv->hscrollbar;
}

/**
* gtk_scrolled_window_get_vscrollbar:
* @scrolled_window: a #GtkScrolledWindow
*
* Returns the vertical scrollbar of @scrolled_window.
*
* Returns: (transfer none): the vertical scrollbar of the scrolled window,
* or %NULL if it does not have one.
*
* Since: 2.8
*/
GtkWidget*
gtk_scrolled_window_get_vscrollbar (GtkScrolledWindow *scrolled_window)
{
  g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);

  return scrolled_window->priv->vscrollbar;
}

/**
* gtk_scrolled_window_set_policy:
* @scrolled_window: a #GtkScrolledWindow
* @hscrollbar_policy: policy for horizontal bar
* @vscrollbar_policy: policy for vertical bar
*
* Sets the scrollbar policy for the horizontal and vertical scrollbars.
*
* The policy determines when the scrollbar should appear; it is a value
* from the #GtkPolicyType enumeration. If %GTK_POLICY_ALWAYS, the
* scrollbar is always present; if %GTK_POLICY_NEVER, the scrollbar is
* never present; if %GTK_POLICY_AUTOMATIC, the scrollbar is present only
* if needed (that is, if the slider part of the bar would be smaller
* than the trough - the display is larger than the page size).
*/
void
gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
GtkPolicyType hscrollbar_policy,
GtkPolicyType vscrollbar_policy)
{
  GtkScrolledWindowPrivate *priv;
  GObject *object = G_OBJECT (scrolled_window);
  
  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));

  priv = scrolled_window->priv;

  if ((priv->hscrollbar_policy != hscrollbar_policy) ||
      (priv->vscrollbar_policy != vscrollbar_policy))
    {
      priv->hscrollbar_policy = hscrollbar_policy;
      priv->vscrollbar_policy = vscrollbar_policy;

      gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));

      g_object_freeze_notify (object);
      g_object_notify (object, "hscrollbar-policy");
      g_object_notify (object, "vscrollbar-policy");
      g_object_thaw_notify (object);
    }
}

/**
* gtk_scrolled_window_get_policy:
* @scrolled_window: a #GtkScrolledWindow
* @hscrollbar_policy: (out) (allow-none): location to store the policy
* for the horizontal scrollbar, or %NULL.
* @vscrollbar_policy: (out) (allow-none): location to store the policy
* for the vertical scrollbar, or %NULL.
*
* Retrieves the current policy values for the horizontal and vertical
* scrollbars. See gtk_scrolled_window_set_policy().
*/
void
gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window,
GtkPolicyType *hscrollbar_policy,
GtkPolicyType *vscrollbar_policy)
{
  GtkScrolledWindowPrivate *priv;

  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));

  priv = scrolled_window->priv;

  if (hscrollbar_policy)
    *hscrollbar_policy = priv->hscrollbar_policy;
  if (vscrollbar_policy)
    *vscrollbar_policy = priv->vscrollbar_policy;
}

static void
gtk_scrolled_window_update_real_placement (GtkScrolledWindow *scrolled_window)
{
  GtkScrolledWindowPrivate *priv = scrolled_window->priv;
  GtkSettings *settings;

  settings = gtk_widget_get_settings (GTK_WIDGET (scrolled_window));

  if (priv->window_placement_set || settings == NULL)
    priv->real_window_placement = priv->window_placement;
  else
    g_object_get (settings,
"gtk-scrolled-window-placement",
&priv->real_window_placement,
NULL);
}

static void
gtk_scrolled_window_set_placement_internal (GtkScrolledWindow *scrolled_window,
GtkCornerType window_placement)
{
  GtkScrolledWindowPrivate *priv = scrolled_window->priv;

  if (priv->window_placement != window_placement)
    {
      priv->window_placement = window_placement;

      gtk_scrolled_window_update_real_placement (scrolled_window);
      gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
      
      g_object_notify (G_OBJECT (scrolled_window), "window-placement");
    }
}

static void
gtk_scrolled_window_set_placement_set (GtkScrolledWindow *scrolled_window,
gboolean placement_set,
gboolean emit_resize)
{
  GtkScrolledWindowPrivate *priv = scrolled_window->priv;

  if (priv->window_placement_set != placement_set)
    {
      priv->window_placement_set = placement_set;

      gtk_scrolled_window_update_real_placement (scrolled_window);
      if (emit_resize)
        gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));

      g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
    }
}

/**
* gtk_scrolled_window_set_placement:
* @scrolled_window: a #GtkScrolledWindow
* @window_placement: position of the child window
*
* Sets the placement of the contents with respect to the scrollbars
* for the scrolled window.
*
* The default is %GTK_CORNER_TOP_LEFT, meaning the child is
* in the top left, with the scrollbars underneath and to the right.
* Other values in #GtkCornerType are %GTK_CORNER_TOP_RIGHT,
* %GTK_CORNER_BOTTOM_LEFT, and %GTK_CORNER_BOTTOM_RIGHT.
*
* See also gtk_scrolled_window_get_placement() and
* gtk_scrolled_window_unset_placement().
*/
void
gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
GtkCornerType window_placement)
{
  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));

  gtk_scrolled_window_set_placement_set (scrolled_window, TRUE, FALSE);
  gtk_scrolled_window_set_placement_internal (scrolled_window, window_placement);
}

/**
* gtk_scrolled_window_get_placement:
* @scrolled_window: a #GtkScrolledWindow
*
* Gets the placement of the contents with respect to the scrollbars
* for the scrolled window. See gtk_scrolled_window_set_placement().
*
* Return value: the current placement value.
*
* See also gtk_scrolled_window_set_placement() and
* gtk_scrolled_window_unset_placement().
**/
GtkCornerType
gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window)
{
  g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT);

  return scrolled_window->priv->window_placement;
}

/**
* gtk_scrolled_window_unset_placement:
* @scrolled_window: a #GtkScrolledWindow
*
* Unsets the placement of the contents with respect to the scrollbars
* for the scrolled window. If no window placement is set for a scrolled
* window, it obeys the "gtk-scrolled-window-placement" XSETTING.
*
* See also gtk_scrolled_window_set_placement() and
* gtk_scrolled_window_get_placement().
*
* Since: 2.10
**/
void
gtk_scrolled_window_unset_placement (GtkScrolledWindow *scrolled_window)
{
  GtkScrolledWindowPrivate *priv;

  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));

  priv = scrolled_window->priv;

  if (priv->window_placement_set)
    {
      priv->window_placement_set = FALSE;

      gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));

      g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
    }
}

/**
* gtk_scrolled_window_set_shadow_type:
* @scrolled_window: a #GtkScrolledWindow
* @type: kind of shadow to draw around scrolled window contents
*
* Changes the type of shadow drawn around the contents of
* @scrolled_window.
*
**/
void
gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
GtkShadowType type)
{
  GtkScrolledWindowPrivate *priv;

  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
  g_return_if_fail (type >= GTK_SHADOW_NONE && type <= GTK_SHADOW_ETCHED_OUT);

  priv = scrolled_window->priv;

  if (priv->shadow_type != type)
    {
      priv->shadow_type = type;

      if (gtk_widget_is_drawable (GTK_WIDGET (scrolled_window)))
gtk_widget_queue_draw (GTK_WIDGET (scrolled_window));

      gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));

      g_object_notify (G_OBJECT (scrolled_window), "shadow-type");
    }
}

/**
* gtk_scrolled_window_get_shadow_type:
* @scrolled_window: a #GtkScrolledWindow
*
* Gets the shadow type of the scrolled window. See
* gtk_scrolled_window_set_shadow_type().
*
* Return value: the current shadow type
**/
GtkShadowType
gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window)
{
  g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_NONE);

  return scrolled_window->priv->shadow_type;
}

static void
gtk_scrolled_window_destroy (GtkWidget *widget)
{
  GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
  GtkScrolledWindowPrivate *priv = scrolled_window->priv;

  if (priv->hscrollbar)
    {
      g_signal_handlers_disconnect_by_func (gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)),
gtk_scrolled_window_adjustment_changed,
scrolled_window);
      gtk_widget_unparent (priv->hscrollbar);
      gtk_widget_destroy (priv->hscrollbar);
      g_object_unref (priv->hscrollbar);
      priv->hscrollbar = NULL;
    }
  if (priv->vscrollbar)
    {
      g_signal_handlers_disconnect_by_func (gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)),
gtk_scrolled_window_adjustment_changed,
scrolled_window);
      gtk_widget_unparent (priv->vscrollbar);
      gtk_widget_destroy (priv->vscrollbar);
      g_object_unref (priv->vscrollbar);
      priv->vscrollbar = NULL;
    }

  GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->destroy (widget);
}

static void
gtk_scrolled_window_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
  GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
  GtkScrolledWindowPrivate *priv = scrolled_window->priv;

  switch (prop_id)
    {
    case PROP_HADJUSTMENT:
      gtk_scrolled_window_set_hadjustment (scrolled_window,
g_value_get_object (value));
      break;
    case PROP_VADJUSTMENT:
      gtk_scrolled_window_set_vadjustment (scrolled_window,
g_value_get_object (value));
      break;
    case PROP_HSCROLLBAR_POLICY:
      gtk_scrolled_window_set_policy (scrolled_window,
g_value_get_enum (value),
priv->vscrollbar_policy);
      break;
    case PROP_VSCROLLBAR_POLICY:
      gtk_scrolled_window_set_policy (scrolled_window,
priv->hscrollbar_policy,
g_value_get_enum (value));
      break;
    case PROP_WINDOW_PLACEMENT:
      gtk_scrolled_window_set_placement_internal (scrolled_window,
g_value_get_enum (value));
      break;
    case PROP_WINDOW_PLACEMENT_SET:
      gtk_scrolled_window_set_placement_set (scrolled_window,
g_value_get_boolean (value),
TRUE);
      break;
    case PROP_SHADOW_TYPE:
      gtk_scrolled_window_set_shadow_type (scrolled_window,
g_value_get_enum (value));
      break;
    case PROP_MIN_CONTENT_WIDTH:
      gtk_scrolled_window_set_min_content_width (scrolled_window,
                                                 g_value_get_int (value));
      break;
    case PROP_MIN_CONTENT_HEIGHT:
      gtk_scrolled_window_set_min_content_height (scrolled_window,
                                                  g_value_get_int (value));
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
gtk_scrolled_window_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
  GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
  GtkScrolledWindowPrivate *priv = scrolled_window->priv;

  switch (prop_id)
    {
    case PROP_HADJUSTMENT:
      g_value_set_object (value,
G_OBJECT (gtk_scrolled_window_get_hadjustment (scrolled_window)));
      break;
    case PROP_VADJUSTMENT:
      g_value_set_object (value,
G_OBJECT (gtk_scrolled_window_get_vadjustment (scrolled_window)));
      break;
    case PROP_WINDOW_PLACEMENT:
      g_value_set_enum (value, priv->window_placement);
      break;
    case PROP_WINDOW_PLACEMENT_SET:
      g_value_set_boolean (value, priv->window_placement_set);
      break;
    case PROP_SHADOW_TYPE:
      g_value_set_enum (value, priv->shadow_type);
      break;
    case PROP_HSCROLLBAR_POLICY:
      g_value_set_enum (value, priv->hscrollbar_policy);
      break;
    case PROP_VSCROLLBAR_POLICY:
      g_value_set_enum (value, priv->vscrollbar_policy);
      break;
    case PROP_MIN_CONTENT_WIDTH:
      g_value_set_int (value, priv->min_content_width);
      break;
    case PROP_MIN_CONTENT_HEIGHT:
      g_value_set_int (value, priv->min_content_height);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
traverse_container (GtkWidget *widget,
gpointer data)
{
  if (GTK_IS_SCROLLED_WINDOW (widget))
    {
      gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
      gtk_widget_queue_resize (widget);
    }
  else if (GTK_IS_CONTAINER (widget))
    gtk_container_forall (GTK_CONTAINER (widget), traverse_container, NULL);
}

static void
gtk_scrolled_window_settings_changed (GtkSettings *settings)
{
  GList *list, *l;

  list = gtk_window_list_toplevels ();

  for (l = list; l; l = l->next)
    gtk_container_forall (GTK_CONTAINER (l->data),
traverse_container, NULL);

  g_list_free (list);
}

static void
gtk_scrolled_window_screen_changed (GtkWidget *widget,
GdkScreen *previous_screen)
{
  GtkSettings *settings;
  guint window_placement_connection;

  gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));

  if (!gtk_widget_has_screen (widget))
    return;

  settings = gtk_widget_get_settings (widget);

  window_placement_connection =
    GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (settings),
"gtk-scrolled-window-connection"));
  
  if (window_placement_connection)
    return;

  window_placement_connection =
    g_signal_connect (settings, "notify::gtk-scrolled-window-placement",
G_CALLBACK (gtk_scrolled_window_settings_changed), NULL);
  g_object_set_data (G_OBJECT (settings),
I_("gtk-scrolled-window-connection"),
GUINT_TO_POINTER (window_placement_connection));
}

static gboolean
gtk_scrolled_window_draw (GtkWidget *widget,
                          cairo_t *cr)
{
  GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
  GtkScrolledWindowPrivate *priv = scrolled_window->priv;

  if (priv->shadow_type != GTK_SHADOW_NONE)
    {
      GtkAllocation relative_allocation;
      GtkStyleContext *context;
      gboolean scrollbars_within_bevel;

      context = gtk_widget_get_style_context (widget);

      gtk_style_context_save (context);
      gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME);

      gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);

      if (!scrollbars_within_bevel)
        {
          GtkStateFlags state;
          GtkBorder padding, border;

          state = gtk_widget_get_state_flags (widget);
          gtk_style_context_get_padding (context, state, &padding);
          gtk_style_context_get_border (context, state, &border);

          gtk_scrolled_window_relative_allocation (widget, &relative_allocation);

          relative_allocation.x -= padding.left + border.left;
          relative_allocation.y -= padding.top + border.top;
          relative_allocation.width += padding.left + padding.right + border.left + border.right;
          relative_allocation.height += padding.top + padding.bottom + border.top + border.bottom;
        }
      else
        {
          relative_allocation.x = 0;
          relative_allocation.y = 0;
          relative_allocation.width = gtk_widget_get_allocated_width (widget);
          relative_allocation.height = gtk_widget_get_allocated_height (widget);
        }

      gtk_render_frame (context, cr,
                        relative_allocation.x,
                        relative_allocation.y,
relative_allocation.width,
relative_allocation.height);

      gtk_style_context_restore (context);
    }

  GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->draw (widget, cr);

  return FALSE;
}

static void
gtk_scrolled_window_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data)
{
  GtkScrolledWindowPrivate *priv;
  GtkScrolledWindow *scrolled_window;

  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
  g_return_if_fail (callback != NULL);

  GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->forall (container,
include_internals,
callback,
callback_data);
  if (include_internals)
    {
      scrolled_window = GTK_SCROLLED_WINDOW (container);
      priv = scrolled_window->priv;

      if (priv->vscrollbar)
callback (priv->vscrollbar, callback_data);
      if (priv->hscrollbar)
callback (priv->hscrollbar, callback_data);
    }
}

static gboolean
gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
GtkScrollType scroll,
gboolean horizontal)
{
  GtkScrolledWindowPrivate *priv = scrolled_window->priv;
  GtkAdjustment *adjustment = NULL;
  
  switch (scroll)
    {
    case GTK_SCROLL_STEP_UP:
      scroll = GTK_SCROLL_STEP_BACKWARD;
      horizontal = FALSE;
      break;
    case GTK_SCROLL_STEP_DOWN:
      scroll = GTK_SCROLL_STEP_FORWARD;
      horizontal = FALSE;
      break;
    case GTK_SCROLL_STEP_LEFT:
      scroll = GTK_SCROLL_STEP_BACKWARD;
      horizontal = TRUE;
      break;
    case GTK_SCROLL_STEP_RIGHT:
      scroll = GTK_SCROLL_STEP_FORWARD;
      horizontal = TRUE;
      break;
    case GTK_SCROLL_PAGE_UP:
      scroll = GTK_SCROLL_PAGE_BACKWARD;
      horizontal = FALSE;
      break;
    case GTK_SCROLL_PAGE_DOWN:
      scroll = GTK_SCROLL_PAGE_FORWARD;
      horizontal = FALSE;
      break;
    case GTK_SCROLL_PAGE_LEFT:
      scroll = GTK_SCROLL_STEP_BACKWARD;
      horizontal = TRUE;
      break;
    case GTK_SCROLL_PAGE_RIGHT:
      scroll = GTK_SCROLL_STEP_FORWARD;
      horizontal = TRUE;
      break;
    case GTK_SCROLL_STEP_BACKWARD:
    case GTK_SCROLL_STEP_FORWARD:
    case GTK_SCROLL_PAGE_BACKWARD:
    case GTK_SCROLL_PAGE_FORWARD:
    case GTK_SCROLL_START:
    case GTK_SCROLL_END:
      break;
    default:
      g_warning ("Invalid scroll type %u for GtkScrolledWindow::scroll-child", scroll);
      return FALSE;
    }

  if ((horizontal && (!priv->hscrollbar || !priv->hscrollbar_visible)) ||
      (!horizontal && (!priv->vscrollbar || !priv->vscrollbar_visible)))
    return FALSE;

  if (horizontal)
    {
      if (priv->hscrollbar)
adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
    }
  else
    {
      if (priv->vscrollbar)
adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
    }

  if (adjustment)
    {
      gdouble value = gtk_adjustment_get_value (adjustment);
      
      switch (scroll)
{
case GTK_SCROLL_STEP_FORWARD:
value += gtk_adjustment_get_step_increment (adjustment);
break;
case GTK_SCROLL_STEP_BACKWARD:
value -= gtk_adjustment_get_step_increment (adjustment);
break;
case GTK_SCROLL_PAGE_FORWARD:
value += gtk_adjustment_get_page_increment (adjustment);
break;
case GTK_SCROLL_PAGE_BACKWARD:
value -= gtk_adjustment_get_page_increment (adjustment);
break;
case GTK_SCROLL_START:
value = gtk_adjustment_get_lower (adjustment);
break;
case GTK_SCROLL_END:
value = gtk_adjustment_get_upper (adjustment);
break;
default:
g_assert_not_reached ();
break;
}

      gtk_adjustment_set_value (adjustment, value);

      return TRUE;
    }

  return FALSE;
}

static void
gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
GtkDirectionType direction_type)
{
  GtkScrolledWindowPrivate *priv = scrolled_window->priv;
  GtkWidget *toplevel;
  
  /* Focus out of the scrolled window entirely. We do this by setting
* a flag, then propagating the focus motion to the notebook.
*/
  toplevel = gtk_widget_get_toplevel (GTK_WIDGET (scrolled_window));
  if (!gtk_widget_is_toplevel (toplevel))
    return;

  g_object_ref (scrolled_window);

  priv->focus_out = TRUE;
  g_signal_emit_by_name (toplevel, "move-focus", direction_type);
  priv->focus_out = FALSE;

  g_object_unref (scrolled_window);
}

static void
gtk_scrolled_window_relative_allocation (GtkWidget *widget,
GtkAllocation *allocation)
{
  GtkAllocation widget_allocation;
  GtkScrolledWindow *scrolled_window;
  GtkScrolledWindowPrivate *priv;
  gint sb_spacing;
  gint sb_width;
  gint sb_height;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (allocation != NULL);

  scrolled_window = GTK_SCROLLED_WINDOW (widget);
  priv = scrolled_window->priv;

  /* Get possible scrollbar dimensions */
  sb_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
  gtk_widget_get_preferred_height (priv->hscrollbar, &sb_height, NULL);
  gtk_widget_get_preferred_width (priv->vscrollbar, &sb_width, NULL);

  /* Subtract some things from our available allocation size */
  allocation->x = 0;
  allocation->y = 0;

  if (priv->shadow_type != GTK_SHADOW_NONE)
    {
      GtkStyleContext *context;
      GtkStateFlags state;
      GtkBorder padding, border;

      context = gtk_widget_get_style_context (widget);
      state = gtk_widget_get_state_flags (widget);

      gtk_style_context_save (context);
      gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME);

      gtk_style_context_get_border (context, state, &border);
      gtk_style_context_get_padding (context, state, &padding);

      allocation->x += padding.left + border.left;
      allocation->y += padding.top + border.top;

      gtk_style_context_restore (context);
    }

  gtk_widget_get_allocation (widget, &widget_allocation);
  allocation->width = MAX (1, (gint) widget_allocation.width - allocation->x * 2);
  allocation->height = MAX (1, (gint) widget_allocation.height - allocation->y * 2);

  if (priv->vscrollbar_visible)
    {
      gboolean is_rtl;

      is_rtl = gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL;
  
      if ((!is_rtl &&
(priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
(is_rtl &&
(priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
allocation->x += (sb_width + sb_spacing);

      allocation->width = MAX (1, allocation->width - (sb_width + sb_spacing));
    }
  if (priv->hscrollbar_visible)
    {

      if (priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT ||
priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)
allocation->y += (sb_height + sb_spacing);

      allocation->height = MAX (1, allocation->height - (sb_height + sb_spacing));
    }
}

static void
gtk_scrolled_window_allocate_child (GtkScrolledWindow *swindow,
GtkAllocation *relative_allocation)
{
  GtkWidget *widget = GTK_WIDGET (swindow), *child;
  GtkAllocation allocation;
  GtkAllocation child_allocation;

  child = gtk_bin_get_child (GTK_BIN (widget));

  gtk_widget_get_allocation (widget, &allocation);

  gtk_scrolled_window_relative_allocation (widget, relative_allocation);
  child_allocation.x = relative_allocation->x + allocation.x;
  child_allocation.y = relative_allocation->y + allocation.y;
  child_allocation.width = relative_allocation->width;
  child_allocation.height = relative_allocation->height;

  gtk_widget_size_allocate (child, &child_allocation);
}

static void
gtk_scrolled_window_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
  GtkScrolledWindow *scrolled_window;
  GtkScrolledWindowPrivate *priv;
  GtkStyleContext *context;
  GtkStateFlags state;
  GtkBorder padding, border;
  GtkBin *bin;
  GtkAllocation relative_allocation;
  GtkAllocation child_allocation;
  GtkWidget *child;
  gboolean scrollbars_within_bevel;
  gint sb_spacing;
  gint sb_width;
  gint sb_height;
 
  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
  g_return_if_fail (allocation != NULL);

  scrolled_window = GTK_SCROLLED_WINDOW (widget);
  bin = GTK_BIN (scrolled_window);
  priv = scrolled_window->priv;

  /* Get possible scrollbar dimensions */
  sb_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
  gtk_widget_get_preferred_height (priv->hscrollbar, &sb_height, NULL);
  gtk_widget_get_preferred_width (priv->vscrollbar, &sb_width, NULL);

  context = gtk_widget_get_style_context (widget);
  state = gtk_widget_get_state_flags (widget);

  gtk_style_context_save (context);
  gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME);

  gtk_style_context_get_padding (context, state, &padding);
  gtk_style_context_get_border (context, state, &border);

  gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);

  gtk_widget_set_allocation (widget, allocation);

  gtk_style_context_restore (context);

  if (priv->hscrollbar_policy == GTK_POLICY_ALWAYS)
    priv->hscrollbar_visible = TRUE;
  else if (priv->hscrollbar_policy == GTK_POLICY_NEVER)
    priv->hscrollbar_visible = FALSE;
  if (priv->vscrollbar_policy == GTK_POLICY_ALWAYS)
    priv->vscrollbar_visible = TRUE;
  else if (priv->vscrollbar_policy == GTK_POLICY_NEVER)
    priv->vscrollbar_visible = FALSE;

  child = gtk_bin_get_child (bin);
  if (child && gtk_widget_get_visible (child))
    {
      gint child_scroll_width;
      gint child_scroll_height;
      gboolean previous_hvis;
      gboolean previous_vvis;
      guint count = 0;

      /* Determine scrollbar visibility first via hfw apis */
      if (gtk_widget_get_request_mode (child) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH)
{
if (gtk_scrollable_get_hscroll_policy (GTK_SCROLLABLE (child)) == GTK_SCROLL_MINIMUM)
gtk_widget_get_preferred_width (child, &child_scroll_width, NULL);
else
gtk_widget_get_preferred_width (child, NULL, &child_scroll_width);

if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
/* First try without a vertical scrollbar if the content will fit the height
* given the extra width of the scrollbar */
if (gtk_scrollable_get_vscroll_policy (GTK_SCROLLABLE (child)) == GTK_SCROLL_MINIMUM)
gtk_widget_get_preferred_height_for_width (child,
MAX (allocation->width, child_scroll_width),
&child_scroll_height, NULL);
else
gtk_widget_get_preferred_height_for_width (child,
MAX (allocation->width, child_scroll_width),
NULL, &child_scroll_height);

if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
/* Does the content height fit the allocation height ? */
priv->vscrollbar_visible = child_scroll_height > allocation->height;

/* Does the content width fit the allocation with minus a possible scrollbar ? */
priv->hscrollbar_visible =
child_scroll_width > allocation->width -
(priv->vscrollbar_visible ? sb_width + sb_spacing : 0);

/* Now that we've guessed the hscrollbar, does the content height fit
* the possible new allocation height ? */
priv->vscrollbar_visible =
child_scroll_height > allocation->height -
(priv->hscrollbar_visible ? sb_height + sb_spacing : 0);

/* Now that we've guessed the vscrollbar, does the content width fit
* the possible new allocation width ? */
priv->hscrollbar_visible =
child_scroll_width > allocation->width -
(priv->vscrollbar_visible ? sb_width + sb_spacing : 0);
}
else /* priv->hscrollbar_policy != GTK_POLICY_AUTOMATIC */
{
priv->hscrollbar_visible = priv->hscrollbar_policy != GTK_POLICY_NEVER;
priv->vscrollbar_visible = child_scroll_height > allocation->height -
(priv->hscrollbar_visible ? sb_height + sb_spacing : 0);
}
}
else /* priv->vscrollbar_policy != GTK_POLICY_AUTOMATIC */
{
priv->vscrollbar_visible = priv->vscrollbar_policy != GTK_POLICY_NEVER;

if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
priv->hscrollbar_visible =
child_scroll_width > allocation->width -
(priv->vscrollbar_visible ? 0 : sb_width + sb_spacing);
else
priv->hscrollbar_visible = priv->hscrollbar_policy != GTK_POLICY_NEVER;
}
}
      else /* GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT */
{
if (gtk_scrollable_get_vscroll_policy (GTK_SCROLLABLE (child)) == GTK_SCROLL_MINIMUM)
gtk_widget_get_preferred_height (child, &child_scroll_height, NULL);
else
gtk_widget_get_preferred_height (child, NULL, &child_scroll_height);

if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
/* First try without a horizontal scrollbar if the content will fit the width
* given the extra height of the scrollbar */
if (gtk_scrollable_get_hscroll_policy (GTK_SCROLLABLE (child)) == GTK_SCROLL_MINIMUM)
gtk_widget_get_preferred_width_for_height (child,
MAX (allocation->height, child_scroll_height),
&child_scroll_width, NULL);
else
gtk_widget_get_preferred_width_for_height (child,
MAX (allocation->height, child_scroll_height),
NULL, &child_scroll_width);

if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
/* Does the content width fit the allocation width ? */
priv->hscrollbar_visible = child_scroll_width > allocation->width;

/* Does the content height fit the allocation with minus a possible scrollbar ? */
priv->vscrollbar_visible =
child_scroll_height > allocation->height -
(priv->hscrollbar_visible ? sb_height + sb_spacing : 0);

/* Now that we've guessed the vscrollbar, does the content width fit
* the possible new allocation width ? */
priv->hscrollbar_visible =
child_scroll_width > allocation->width -
(priv->vscrollbar_visible ? sb_width + sb_spacing : 0);

/* Now that we've guessed the hscrollbar, does the content height fit
* the possible new allocation height ? */
priv->vscrollbar_visible =
child_scroll_height > allocation->height -
(priv->hscrollbar_visible ? sb_height + sb_spacing : 0);
}
else /* priv->vscrollbar_policy != GTK_POLICY_AUTOMATIC */
{
priv->vscrollbar_visible = priv->vscrollbar_policy != GTK_POLICY_NEVER;
priv->hscrollbar_visible = child_scroll_width > allocation->width -
(priv->vscrollbar_visible ? sb_width + sb_spacing : 0);
}
}
else /* priv->hscrollbar_policy != GTK_POLICY_AUTOMATIC */
{
priv->hscrollbar_visible = priv->hscrollbar_policy != GTK_POLICY_NEVER;

if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
priv->vscrollbar_visible =
child_scroll_height > allocation->height -
(priv->hscrollbar_visible ? 0 : sb_height + sb_spacing);
else
priv->vscrollbar_visible = priv->vscrollbar_policy != GTK_POLICY_NEVER;
}
}

      /* Now after guessing scrollbar visibility; fall back on the allocation loop which
* observes the adjustments to detect scrollbar visibility and also avoids
* infinite recursion
*/
      do
{
previous_hvis = priv->hscrollbar_visible;
previous_vvis = priv->vscrollbar_visible;
gtk_scrolled_window_allocate_child (scrolled_window, &relative_allocation);

/* Explicitly force scrollbar visibility checks.
*
* Since we make a guess above, the child might not decide to update the adjustments
* if they logically did not change since the last configuration
*/
if (priv->hscrollbar)
gtk_scrolled_window_adjustment_changed
(gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)), scrolled_window);

if (priv->vscrollbar)
gtk_scrolled_window_adjustment_changed
(gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)), scrolled_window);

/* If, after the first iteration, the hscrollbar and the
* vscrollbar flip visiblity... or if one of the scrollbars flip
* on each itteration indefinitly/infinitely, then we just need both
* at this size.
*/
if ((count &&
previous_hvis != priv->hscrollbar_visible &&
previous_vvis != priv->vscrollbar_visible) || count > 3)
{
priv->hscrollbar_visible = TRUE;
priv->vscrollbar_visible = TRUE;

gtk_scrolled_window_allocate_child (scrolled_window, &relative_allocation);

break;
}

count++;
}
      while (previous_hvis != priv->hscrollbar_visible ||
previous_vvis != priv->vscrollbar_visible);
    }
  else
    {
      priv->hscrollbar_visible = priv->hscrollbar_policy == GTK_POLICY_ALWAYS;
      priv->vscrollbar_visible = priv->vscrollbar_policy == GTK_POLICY_ALWAYS;
      gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
    }

  if (priv->hscrollbar_visible)
    {
      if (!gtk_widget_get_visible (priv->hscrollbar))
gtk_widget_show (priv->hscrollbar);

      child_allocation.x = relative_allocation.x;
      if (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
priv->real_window_placement == GTK_CORNER_TOP_RIGHT)
child_allocation.y = (relative_allocation.y +
relative_allocation.height +
sb_spacing +
(priv->shadow_type == GTK_SHADOW_NONE ?
0 : padding.top + border.top));
      else
child_allocation.y = 0;

      child_allocation.width = relative_allocation.width;
      child_allocation.height = sb_height;
      child_allocation.x += allocation->x;
      child_allocation.y += allocation->y;

      if (priv->shadow_type != GTK_SHADOW_NONE)
{
          if (!scrollbars_within_bevel)
            {
              child_allocation.x -= padding.left + border.left;
              child_allocation.width += padding.left + padding.right + border.left + border.right;
            }
          else if (GTK_CORNER_TOP_RIGHT == priv->real_window_placement ||
                   GTK_CORNER_TOP_LEFT == priv->real_window_placement)
            {
              child_allocation.y -= padding.top + border.top;
            }
          else
            {
              child_allocation.y += padding.top + border.top;
            }
}

      gtk_widget_size_allocate (priv->hscrollbar, &child_allocation);
    }
  else if (gtk_widget_get_visible (priv->hscrollbar))
    gtk_widget_hide (priv->hscrollbar);

  if (priv->vscrollbar_visible)
    {
      if (!gtk_widget_get_visible (priv->vscrollbar))
gtk_widget_show (priv->vscrollbar);

      if ((gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL &&
(priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
(gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR &&
(priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
child_allocation.x = (relative_allocation.x +
relative_allocation.width +
sb_spacing +
(priv->shadow_type == GTK_SHADOW_NONE ?
0 : padding.left + border.left));
      else
child_allocation.x = 0;

      child_allocation.y = relative_allocation.y;
      child_allocation.width = sb_width;
      child_allocation.height = relative_allocation.height;
      child_allocation.x += allocation->x;
      child_allocation.y += allocation->y;

      if (priv->shadow_type != GTK_SHADOW_NONE)
{
          if (!scrollbars_within_bevel)
            {
              child_allocation.y -= padding.top + border.top;
child_allocation.height += padding.top + padding.bottom + border.top + border.bottom;
            }
          else if (GTK_CORNER_BOTTOM_LEFT == priv->real_window_placement ||
                   GTK_CORNER_TOP_LEFT == priv->real_window_placement)
            {
              child_allocation.x -= padding.left + border.left;
            }
          else
            {
              child_allocation.x += padding.left + border.left;
            }
}

      gtk_widget_size_allocate (priv->vscrollbar, &child_allocation);
    }
  else if (gtk_widget_get_visible (priv->vscrollbar))
    gtk_widget_hide (priv->vscrollbar);
}

static gboolean
gtk_scrolled_window_scroll_event (GtkWidget *widget,
GdkEventScroll *event)
{
  GtkScrolledWindowPrivate *priv;
  GtkScrolledWindow *scrolled_window;
  GtkWidget *range;

  g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  scrolled_window = GTK_SCROLLED_WINDOW (widget);
  priv = scrolled_window->priv;

  if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
    range = priv->vscrollbar;
  else
    range = priv->hscrollbar;

  if (range && gtk_widget_get_visible (range))
    {
      GtkAdjustment *adjustment = gtk_range_get_adjustment (GTK_RANGE (range));
      gdouble delta;

      delta = _gtk_range_get_wheel_delta (GTK_RANGE (range), event->direction);

      gtk_adjustment_set_value (adjustment, gtk_adjustment_get_value (adjustment) + delta);

      return TRUE;
    }

  return FALSE;
}

static gboolean
gtk_scrolled_window_focus (GtkWidget *widget,
GtkDirectionType direction)
{
  GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
  GtkScrolledWindowPrivate *priv = scrolled_window->priv;
  GtkWidget *child;
  gboolean had_focus_child;

  had_focus_child = gtk_container_get_focus_child (GTK_CONTAINER (widget)) != NULL;

  if (priv->focus_out)
    {
      priv->focus_out = FALSE; /* Clear this to catch the wrap-around case */
      return FALSE;
    }
  
  if (gtk_widget_is_focus (widget))
    return FALSE;

  /* We only put the scrolled window itself in the focus chain if it
* isn't possible to focus any children.
*/
  child = gtk_bin_get_child (GTK_BIN (widget));
  if (child)
    {
      if (gtk_widget_child_focus (child, direction))
return TRUE;
    }

  if (!had_focus_child && gtk_widget_get_can_focus (widget))
    {
      gtk_widget_grab_focus (widget);
      return TRUE;
    }
  else
    return FALSE;
}

static void
gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
gpointer data)
{
  GtkScrolledWindowPrivate *priv;
  GtkScrolledWindow *scrolled_window;

  g_return_if_fail (adjustment != NULL);
  g_return_if_fail (data != NULL);

  scrolled_window = GTK_SCROLLED_WINDOW (data);
  priv = scrolled_window->priv;

  if (priv->hscrollbar &&
      adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)))
    {
      if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
gboolean visible;

visible = priv->hscrollbar_visible;
priv->hscrollbar_visible = (gtk_adjustment_get_upper (adjustment) - gtk_adjustment_get_lower (adjustment) >
gtk_adjustment_get_page_size (adjustment));

if (priv->hscrollbar_visible != visible)
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
}
    }
  else if (priv->vscrollbar &&
adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)))
    {
      if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
gboolean visible;

visible = priv->vscrollbar_visible;
priv->vscrollbar_visible = (gtk_adjustment_get_upper (adjustment) - gtk_adjustment_get_lower (adjustment) >
gtk_adjustment_get_page_size (adjustment));

if (priv->vscrollbar_visible != visible)
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
}
    }
}

static void
gtk_scrolled_window_add (GtkContainer *container,
                         GtkWidget *child)
{
  GtkScrolledWindowPrivate *priv;
  GtkScrolledWindow *scrolled_window;
  GtkBin *bin;
  GtkWidget *child_widget;
  GtkAdjustment *hadj, *vadj;

  bin = GTK_BIN (container);
  child_widget = gtk_bin_get_child (bin);
  g_return_if_fail (child_widget == NULL);

  scrolled_window = GTK_SCROLLED_WINDOW (container);
  priv = scrolled_window->priv;

  _gtk_bin_set_child (bin, child);
  gtk_widget_set_parent (child, GTK_WIDGET (bin));

  hadj = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
  vadj = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));

  if (GTK_IS_SCROLLABLE (child))
    g_object_set (child, "hadjustment", hadj, "vadjustment", vadj, NULL);
  else
    g_warning ("gtk_scrolled_window_add(): cannot add non scrollable widget "
               "use gtk_scrolled_window_add_with_viewport() instead");
}

static void
gtk_scrolled_window_remove (GtkContainer *container,
GtkWidget *child)
{
  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
  g_return_if_fail (child != NULL);
  g_return_if_fail (gtk_bin_get_child (GTK_BIN (container)) == child);

  g_object_set (child, "hadjustment", NULL, "vadjustment", NULL, NULL);

  /* chain parent class handler to remove child */
  GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->remove (container, child);
}

/**
* gtk_scrolled_window_add_with_viewport:
* @scrolled_window: a #GtkScrolledWindow
* @child: the widget you want to scroll
*
* Used to add children without native scrolling capabilities. This
* is simply a convenience function; it is equivalent to adding the
* unscrollable child to a viewport, then adding the viewport to the
* scrolled window. If a child has native scrolling, use
* gtk_container_add() instead of this function.
*
* The viewport scrolls the child by moving its #GdkWindow, and takes
* the size of the child to be the size of its toplevel #GdkWindow.
* This will be very wrong for most widgets that support native scrolling;
* for example, if you add a widget such as #GtkTreeView with a viewport,
* the whole widget will scroll, including the column headings. Thus,
* widgets with native scrolling support should not be used with the
* #GtkViewport proxy.
*
* A widget supports scrolling natively if it implements the
* #GtkScrollable interface.
*/
void
gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,
GtkWidget *child)
{
  GtkBin *bin;
  GtkWidget *viewport;
  GtkWidget *child_widget;

  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
  g_return_if_fail (GTK_IS_WIDGET (child));
  g_return_if_fail (gtk_widget_get_parent (child) == NULL);

  bin = GTK_BIN (scrolled_window);
  child_widget = gtk_bin_get_child (bin);

  if (child_widget)
    {
      g_return_if_fail (GTK_IS_VIEWPORT (child_widget));
      g_return_if_fail (gtk_bin_get_child (GTK_BIN (child_widget)) == NULL);

      viewport = child_widget;
    }
  else
    {
      viewport =
        gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window),
                          gtk_scrolled_window_get_vadjustment (scrolled_window));
      gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
    }

  gtk_widget_show (viewport);
  gtk_container_add (GTK_CONTAINER (viewport), child);
}

/*
* _gtk_scrolled_window_get_spacing:
* @scrolled_window: a scrolled window
*
* Gets the spacing between the scrolled window's scrollbars and
* the scrolled widget. Used by GtkCombo
*
* Return value: the spacing, in pixels.
*/
gint
_gtk_scrolled_window_get_scrollbar_spacing (GtkScrolledWindow *scrolled_window)
{
  GtkScrolledWindowClass *class;
    
  g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);

  class = GTK_SCROLLED_WINDOW_GET_CLASS (scrolled_window);

  if (class->scrollbar_spacing >= 0)
    return class->scrollbar_spacing;
  else
    {
      gint scrollbar_spacing;
      
      gtk_widget_style_get (GTK_WIDGET (scrolled_window),
"scrollbar-spacing", &scrollbar_spacing,
NULL);

      return scrollbar_spacing;
    }
}


static void
gtk_scrolled_window_get_preferred_size (GtkWidget *widget,
                                        GtkOrientation orientation,
                                        gint *minimum_size,
                                        gint *natural_size)
{
  GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
  GtkScrolledWindowPrivate *priv = scrolled_window->priv;
  GtkBin *bin = GTK_BIN (scrolled_window);
  gint extra_width;
  gint extra_height;
  gint scrollbar_spacing;
  GtkRequisition hscrollbar_requisition;
  GtkRequisition vscrollbar_requisition;
  GtkRequisition minimum_req, natural_req;
  GtkWidget *child;
  gint min_child_size, nat_child_size;

  scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);

  extra_width = 0;
  extra_height = 0;
  minimum_req.width = 0;
  minimum_req.height = 0;
  natural_req.width = 0;
  natural_req.height = 0;

  gtk_widget_get_preferred_size (priv->hscrollbar,
                                 &hscrollbar_requisition, NULL);
  gtk_widget_get_preferred_size (priv->vscrollbar,
                                 &vscrollbar_requisition, NULL);

  child = gtk_bin_get_child (bin);
  if (child && gtk_widget_get_visible (child))
    {
      if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
gtk_widget_get_preferred_width (child,
                                          &min_child_size,
                                          &nat_child_size);

if (priv->hscrollbar_policy == GTK_POLICY_NEVER)
{
minimum_req.width += min_child_size;
natural_req.width += nat_child_size;
}
else
{
              gint min_content_width = priv->min_content_width;

if (min_content_width >= 0)
{
minimum_req.width = MAX (minimum_req.width, min_content_width);
natural_req.width = MAX (natural_req.width, min_content_width);
extra_width = -1;
}
else
{
minimum_req.width += vscrollbar_requisition.width;
natural_req.width += vscrollbar_requisition.width;
}
}
}
      else /* GTK_ORIENTATION_VERTICAL */
{
gtk_widget_get_preferred_height (child,
                                           &min_child_size,
                                           &nat_child_size);

if (priv->vscrollbar_policy == GTK_POLICY_NEVER)
{
minimum_req.height += min_child_size;
natural_req.height += nat_child_size;
}
else
{
gint min_content_height = priv->min_content_height;

if (min_content_height >= 0)
{
minimum_req.height = MAX (minimum_req.height, min_content_height);
natural_req.height = MAX (natural_req.height, min_content_height);
extra_height = -1;
}
else
{
minimum_req.height += vscrollbar_requisition.height;
natural_req.height += vscrollbar_requisition.height;
}
}
}
    }

  if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC ||
      priv->hscrollbar_policy == GTK_POLICY_ALWAYS)
    {
      minimum_req.width = MAX (minimum_req.width, hscrollbar_requisition.width);
      natural_req.width = MAX (natural_req.width, hscrollbar_requisition.width);
      if (!extra_height || priv->hscrollbar_policy == GTK_POLICY_ALWAYS)
extra_height = scrollbar_spacing + hscrollbar_requisition.height;
    }

  if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC ||
      priv->vscrollbar_policy == GTK_POLICY_ALWAYS)
    {
      minimum_req.height = MAX (minimum_req.height, vscrollbar_requisition.height);
      natural_req.height = MAX (natural_req.height, vscrollbar_requisition.height);
      if (!extra_width || priv->vscrollbar_policy == GTK_POLICY_ALWAYS)
extra_width = scrollbar_spacing + vscrollbar_requisition.width;
    }

  minimum_req.width += MAX (0, extra_width);
  minimum_req.height += MAX (0, extra_height);
  natural_req.width += MAX (0, extra_width);
  natural_req.height += MAX (0, extra_height);

  if (priv->shadow_type != GTK_SHADOW_NONE)
    {
      GtkStyleContext *context;
      GtkStateFlags state;
      GtkBorder padding, border;

      context = gtk_widget_get_style_context (GTK_WIDGET (widget));
      state = gtk_widget_get_state_flags (GTK_WIDGET (widget));

      gtk_style_context_save (context);
      gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME);

      gtk_style_context_get_padding (context, state, &padding);
      gtk_style_context_get_border (context, state, &border);

      minimum_req.width += padding.left + padding.right + border.left + border.right;
      minimum_req.height += padding.top + padding.bottom + border.top + border.bottom;
      natural_req.width += padding.left + padding.right + border.left + border.right;
      natural_req.height += padding.top + padding.bottom + border.top + border.bottom;

      gtk_style_context_restore (context);
    }

  if (orientation == GTK_ORIENTATION_HORIZONTAL)
    {
      if (minimum_size)
*minimum_size = minimum_req.width;
      if (natural_size)
*natural_size = natural_req.width;
    }
  else
    {
      if (minimum_size)
*minimum_size = minimum_req.height;
      if (natural_size)
*natural_size = natural_req.height;
    }
}

static void
gtk_scrolled_window_get_preferred_width (GtkWidget *widget,
                                         gint *minimum_size,
                                         gint *natural_size)
{
  gtk_scrolled_window_get_preferred_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
}

static void
gtk_scrolled_window_get_preferred_height (GtkWidget *widget,
                                          gint *minimum_size,
                                          gint *natural_size)
{
  gtk_scrolled_window_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
}

static void
gtk_scrolled_window_get_preferred_height_for_width (GtkWidget *widget,
                                                    gint width,
                                                    gint *minimum_height,
                                                    gint *natural_height)
{
  g_return_if_fail (GTK_IS_WIDGET (widget));

  GTK_WIDGET_GET_CLASS (widget)->get_preferred_height (widget, minimum_height, natural_height);
}

static void
gtk_scrolled_window_get_preferred_width_for_height (GtkWidget *widget,
                                                    gint height,
                                                    gint *minimum_width,
                                                    gint *natural_width)
{
  g_return_if_fail (GTK_IS_WIDGET (widget));

  GTK_WIDGET_GET_CLASS (widget)->get_preferred_width (widget, minimum_width, natural_width);
}

/**
* gtk_scrolled_window_get_min_content_width:
* @scrolled_window: a #GtkScrolledWindow
*
* Gets the minimum content width of @scrolled_window, or -1 if not set.
*
* Returns: the minimum content width
*
* Since: 3.0
*/
gint
gtk_scrolled_window_get_min_content_width (GtkScrolledWindow *scrolled_window)
{
  g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);

  return scrolled_window->priv->min_content_width;
}

/**
* gtk_scrolled_window_set_min_content_width:
* @scrolled_window: a #GtkScrolledWindow
* @width: the minimal content width
*
* Sets the minimum width that @scrolled_window should keep visible.
* Note that this can and (usually will) be smaller than the minimum
* size of the content.
*
* Since: 3.0
*/
void
gtk_scrolled_window_set_min_content_width (GtkScrolledWindow *scrolled_window,
                                           gint width)
{
  GtkScrolledWindowPrivate *priv;

  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));

  priv = scrolled_window->priv;

  if (priv->min_content_width != width)
    {
      priv->min_content_width = width;

      gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));

      g_object_notify (G_OBJECT (scrolled_window), "min-content-width");
    }
}

/**
* gtk_scrolled_window_get_min_content_height:
* @scrolled_window: a #GtkScrolledWindow
*
* Gets the minimal content height of @scrolled_window, or -1 if not set.
*
* Returns: the minimal content height
*
* Since: 3.0
*/
gint
gtk_scrolled_window_get_min_content_height (GtkScrolledWindow *scrolled_window)
{
  g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);

  return scrolled_window->priv->min_content_height;
}

/**
* gtk_scrolled_window_set_min_content_height:
* @scrolled_window: a #GtkScrolledWindow
* @height: the minimal content height
*
* Sets the minimum height that @scrolled_window should keep visible.
* Note that this can and (usually will) be smaller than the minimum
* size of the content.
*
* Since: 3.0
*/
void
gtk_scrolled_window_set_min_content_height (GtkScrolledWindow *scrolled_window,
                                            gint height)
{
  GtkScrolledWindowPrivate *priv;

  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));

  priv = scrolled_window->priv;

  if (priv->min_content_height != height)
    {
      priv->min_content_height = height;

      gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));

      g_object_notify (G_OBJECT (scrolled_window), "min-content-height");
    }
}
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