gtktreeview.c 183 KB
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/* gtktreeview.c
 * Copyright (C) 2000  Red Hat, Inc.,  Jonathan Blandford <jrb@redhat.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library 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.
 */


#include "gtktreeview.h"
#include "gtkrbtree.h"
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#include "gtktreednd.h"
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#include "gtktreeprivate.h"
#include "gtkcellrenderer.h"
#include "gtksignal.h"
#include "gtkmain.h"
#include "gtkbutton.h"
#include "gtkalignment.h"
#include "gtklabel.h"
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#include "gtkhbox.h"
#include "gtkarrow.h"
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#include "gtkintl.h"
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#include <gdk/gdkkeysyms.h>


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/* The "background" areas of all rows/cells add up to cover the entire tree.
 * The background includes all inter-row and inter-cell spacing.
 * The "cell" areas are the cell_area passed in to gtk_cell_renderer_render(),
 * i.e. just the cells, no spacing.
 */

#define BACKGROUND_FIRST_PIXEL(tree_view,tree,node) (_gtk_rbtree_node_find_offset ((tree), (node)) + TREE_VIEW_HEADER_HEIGHT ((tree_view)))
#define CELL_FIRST_PIXEL(tree_view,tree,node) (BACKGROUND_FIRST_PIXEL (tree_view,tree,node) + TREE_VIEW_VERTICAL_SEPARATOR/2)

#define BACKGROUND_HEIGHT(node) (GTK_RBNODE_GET_HEIGHT (node))
#define CELL_HEIGHT(node) (BACKGROUND_HEIGHT (node) - TREE_VIEW_VERTICAL_SEPARATOR);

#define TREE_WINDOW_Y_TO_RBTREE_Y(tree_view,y) ((y) - TREE_VIEW_HEADER_HEIGHT (tree_view))
#define RBTREE_Y_TO_TREE_WINDOW_Y(tree_view,y) ((y) + TREE_VIEW_HEADER_HEIGHT (tree_view))
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typedef struct _GtkTreeViewChild GtkTreeViewChild;

struct _GtkTreeViewChild
{
  GtkWidget *widget;
  gint x;
  gint y;
};

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enum
{
  ROW_ACTIVATED,
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  EXPAND_ROW,
  COLLAPSE_ROW,
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  LAST_SIGNAL
};

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enum {
  PROP_0,

  PROP_MODEL,
  PROP_HADJUSTMENT,
  PROP_VADJUSTMENT,
  PROP_HEADERS_VISIBLE,
  PROP_HEADERS_CLICKABLE,
  PROP_EXPANDER_COLUMN,
  PROP_RULES_HINT
};
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static void     gtk_tree_view_init                 (GtkTreeView      *tree_view);
static void     gtk_tree_view_class_init           (GtkTreeViewClass *klass);
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static void     gtk_tree_view_set_property         (GObject         *object,
						    guint            prop_id,
						    const GValue    *value,
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						    GParamSpec      *pspec);
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static void     gtk_tree_view_get_property         (GObject         *object,
						    guint            prop_id,
						    GValue          *value,
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						    GParamSpec      *pspec);
/* o signals */
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static void     gtk_tree_view_finalize             (GObject          *object);

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/* object signals */
static void     gtk_tree_view_destroy              (GtkObject        *object);

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/* widget signals */
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static void     gtk_tree_view_setup_model          (GtkTreeView      *tree_view);
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static void     gtk_tree_view_realize              (GtkWidget        *widget);
static void     gtk_tree_view_unrealize            (GtkWidget        *widget);
static void     gtk_tree_view_map                  (GtkWidget        *widget);
static void     gtk_tree_view_size_request         (GtkWidget        *widget,
						    GtkRequisition   *requisition);
static void     gtk_tree_view_size_allocate        (GtkWidget        *widget,
						    GtkAllocation    *allocation);
static gboolean gtk_tree_view_expose               (GtkWidget        *widget,
						    GdkEventExpose   *event);
static gboolean gtk_tree_view_motion               (GtkWidget        *widget,
						    GdkEventMotion   *event);
static gboolean gtk_tree_view_enter_notify         (GtkWidget        *widget,
						    GdkEventCrossing *event);
static gboolean gtk_tree_view_leave_notify         (GtkWidget        *widget,
						    GdkEventCrossing *event);
static gboolean gtk_tree_view_button_press         (GtkWidget        *widget,
						    GdkEventButton   *event);
static gboolean gtk_tree_view_button_release       (GtkWidget        *widget,
						    GdkEventButton   *event);
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static void     gtk_tree_view_set_focus_child      (GtkContainer     *container,
						    GtkWidget        *child);
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static void     gtk_tree_view_draw_focus           (GtkWidget        *widget);
static gint     gtk_tree_view_focus_in             (GtkWidget        *widget,
						    GdkEventFocus    *event);
static gint     gtk_tree_view_focus_out            (GtkWidget        *widget,
						    GdkEventFocus    *event);
static gint     gtk_tree_view_focus                (GtkContainer     *container,
						    GtkDirectionType  direction);

/* container signals */
static void     gtk_tree_view_remove               (GtkContainer     *container,
						    GtkWidget        *widget);
static void     gtk_tree_view_forall               (GtkContainer     *container,
						    gboolean          include_internals,
						    GtkCallback       callback,
						    gpointer          callback_data);

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/* Source side drag signals */
static void gtk_tree_view_drag_begin       (GtkWidget        *widget,
                                            GdkDragContext   *context);
static void gtk_tree_view_drag_end         (GtkWidget        *widget,
                                            GdkDragContext   *context);
static void gtk_tree_view_drag_data_get    (GtkWidget        *widget,
                                            GdkDragContext   *context,
                                            GtkSelectionData *selection_data,
                                            guint             info,
                                            guint             time);
static void gtk_tree_view_drag_data_delete (GtkWidget        *widget,
                                            GdkDragContext   *context);

/* Target side drag signals */
static void     gtk_tree_view_drag_leave         (GtkWidget        *widget,
                                                  GdkDragContext   *context,
                                                  guint             time);
static gboolean gtk_tree_view_drag_motion        (GtkWidget        *widget,
                                                  GdkDragContext   *context,
                                                  gint              x,
                                                  gint              y,
                                                  guint             time);
static gboolean gtk_tree_view_drag_drop          (GtkWidget        *widget,
                                                  GdkDragContext   *context,
                                                  gint              x,
                                                  gint              y,
                                                  guint             time);
static void     gtk_tree_view_drag_data_received (GtkWidget        *widget,
                                                  GdkDragContext   *context,
                                                  gint              x,
                                                  gint              y,
                                                  GtkSelectionData *selection_data,
                                                  guint             info,
                                                  guint             time);

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/* tree_model signals */
static void     gtk_tree_view_set_adjustments      (GtkTreeView      *tree_view,
						    GtkAdjustment    *hadj,
						    GtkAdjustment    *vadj);
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static void     gtk_tree_view_range_changed        (GtkTreeModel     *model,
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						    GtkTreePath      *path,
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						    GtkTreeIter      *iter,
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						    GtkTreePath      *end_path,
						    GtkTreeIter      *end_iter,
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						    gpointer          data);
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static void     gtk_tree_view_inserted             (GtkTreeModel     *model,
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						    GtkTreePath      *path,
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						    GtkTreeIter      *iter,
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						    gpointer          data);
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static void     gtk_tree_view_has_child_toggled    (GtkTreeModel     *model,
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						    GtkTreePath      *path,
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						    GtkTreeIter      *iter,
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						    gpointer          data);
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static void     gtk_tree_view_deleted              (GtkTreeModel     *model,
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						    GtkTreePath      *path,
						    gpointer          data);
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static void     gtk_tree_view_reordered            (GtkTreeModel     *model,
						    GtkTreePath      *parent,
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						    GtkTreeIter      *iter,
						    gint             *new_order,
						    gpointer          data);
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/* Internal functions */
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static void     gtk_tree_view_unref_tree           (GtkTreeView      *tree_view,
						    GtkRBTree        *tree);
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static void     gtk_tree_view_queue_draw_node      (GtkTreeView      *tree_view,
						    GtkRBTree        *tree,
						    GtkRBNode        *node,
						    GdkRectangle     *clip_rect);
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static void     gtk_tree_view_queue_draw_path      (GtkTreeView      *tree_view,
                                                    GtkTreePath      *path,
                                                    GdkRectangle     *clip_rect);
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static void     gtk_tree_view_draw_arrow           (GtkTreeView      *tree_view,
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                                                    GtkRBTree        *tree,
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						    GtkRBNode        *node,
						    gint              x,
						    gint              y);
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static void     gtk_tree_view_get_arrow_xrange     (GtkTreeView      *tree_view,
                                                    gint              *x1,
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                                                    gint              *x2);
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static gint     gtk_tree_view_new_column_width     (GtkTreeView      *tree_view,
						    gint              i,
						    gint             *x);
static void     gtk_tree_view_adjustment_changed   (GtkAdjustment    *adjustment,
						    GtkTreeView      *tree_view);
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static gint     gtk_tree_view_insert_iter_height   (GtkTreeView      *tree_view,
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						    GtkRBTree        *tree,
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						    GtkTreeIter      *iter,
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						    gint              depth);
static void     gtk_tree_view_build_tree           (GtkTreeView      *tree_view,
						    GtkRBTree        *tree,
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						    GtkTreeIter      *iter,
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						    gint              depth,
						    gboolean          recurse,
						    gboolean          calc_bounds);
static void     gtk_tree_view_calc_size            (GtkTreeView      *priv,
						    GtkRBTree        *tree,
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						    GtkTreeIter      *iter,
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						    gint              depth);
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static gboolean gtk_tree_view_discover_dirty_iter  (GtkTreeView      *tree_view,
						    GtkTreeIter      *iter,
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						    gint              depth,
						    gint             *height);
static void     gtk_tree_view_discover_dirty       (GtkTreeView      *tree_view,
						    GtkRBTree        *tree,
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						    GtkTreeIter      *iter,
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						    gint              depth);
static void     gtk_tree_view_check_dirty          (GtkTreeView      *tree_view);
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#if 0
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static void     gtk_tree_view_create_button        (GtkTreeView      *tree_view,
						    gint              i);
static void     gtk_tree_view_create_buttons       (GtkTreeView      *tree_view);
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#endif
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static void     gtk_tree_view_clamp_node_visible   (GtkTreeView      *tree_view,
						    GtkRBTree        *tree,
						    GtkRBNode        *node);
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static gboolean gtk_tree_view_maybe_begin_dragging_row (GtkTreeView      *tree_view,
                                                        GdkEventMotion   *event);
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static void     _gtk_tree_view_update_col_width    (GtkTreeView      *tree_view);
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static GtkContainerClass *parent_class = NULL;
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static guint tree_view_signals[LAST_SIGNAL] = { 0 };
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/* Class Functions */
GtkType
gtk_tree_view_get_type (void)
{
  static GtkType tree_view_type = 0;

  if (!tree_view_type)
    {
      static const GTypeInfo tree_view_info =
      {
        sizeof (GtkTreeViewClass),
	NULL,		/* base_init */
	NULL,		/* base_finalize */
        (GClassInitFunc) gtk_tree_view_class_init,
	NULL,		/* class_finalize */
	NULL,		/* class_data */
        sizeof (GtkTreeView),
	0,              /* n_preallocs */
        (GInstanceInitFunc) gtk_tree_view_init
      };

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      tree_view_type = g_type_register_static (GTK_TYPE_CONTAINER, "GtkTreeView", &tree_view_info, 0);
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    }

  return tree_view_type;
}

static void
gtk_tree_view_class_init (GtkTreeViewClass *class)
{
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  GObjectClass *o_class;
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  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
  GtkContainerClass *container_class;

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  o_class = (GObjectClass *) class;
  object_class = (GtkObjectClass *) class;
  widget_class = (GtkWidgetClass *) class;
  container_class = (GtkContainerClass *) class;

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  parent_class = g_type_class_peek_parent (class);

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  o_class->finalize = gtk_tree_view_finalize;
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  o_class->set_property = gtk_tree_view_set_property;
  o_class->get_property = gtk_tree_view_get_property;
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  object_class->destroy = gtk_tree_view_destroy;
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  widget_class->realize = gtk_tree_view_realize;
  widget_class->unrealize = gtk_tree_view_unrealize;
  widget_class->map = gtk_tree_view_map;
  widget_class->size_request = gtk_tree_view_size_request;
  widget_class->size_allocate = gtk_tree_view_size_allocate;
  widget_class->expose_event = gtk_tree_view_expose;
  widget_class->motion_notify_event = gtk_tree_view_motion;
  widget_class->enter_notify_event = gtk_tree_view_enter_notify;
  widget_class->leave_notify_event = gtk_tree_view_leave_notify;
  widget_class->button_press_event = gtk_tree_view_button_press;
  widget_class->button_release_event = gtk_tree_view_button_release;
  widget_class->focus_in_event = gtk_tree_view_focus_in;
  widget_class->focus_out_event = gtk_tree_view_focus_out;

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  widget_class->drag_begin = gtk_tree_view_drag_begin;
  widget_class->drag_end = gtk_tree_view_drag_end;
  widget_class->drag_data_get = gtk_tree_view_drag_data_get;
  widget_class->drag_data_delete = gtk_tree_view_drag_data_delete;

  widget_class->drag_leave = gtk_tree_view_drag_leave;
  widget_class->drag_motion = gtk_tree_view_drag_motion;
  widget_class->drag_drop = gtk_tree_view_drag_drop;
  widget_class->drag_data_received = gtk_tree_view_drag_data_received;
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  container_class->forall = gtk_tree_view_forall;
  container_class->remove = gtk_tree_view_remove;
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  container_class->set_focus_child = gtk_tree_view_set_focus_child;
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  container_class->focus = gtk_tree_view_focus;

  class->set_scroll_adjustments = gtk_tree_view_set_adjustments;

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  g_object_class_install_property (o_class,
                                   PROP_MODEL,
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                                   g_param_spec_object ("model",
							_("TreeView Model"),
							_("The model for the tree view"),
							GTK_TYPE_TREE_MODEL,
							G_PARAM_READWRITE));
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  g_object_class_install_property (o_class,
                                   PROP_HADJUSTMENT,
                                   g_param_spec_object ("hadjustment",
							_("Horizontal Adjustment"),
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                                                        _("Horizontal Adjustment for the widget"),
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                                                        GTK_TYPE_ADJUSTMENT,
                                                        G_PARAM_READWRITE));

  g_object_class_install_property (o_class,
                                   PROP_VADJUSTMENT,
                                   g_param_spec_object ("vadjustment",
							_("Vertical Adjustment"),
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                                                        _("Vertical Adjustment for the widget"),
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                                                        GTK_TYPE_ADJUSTMENT,
                                                        G_PARAM_READWRITE));

  g_object_class_install_property (o_class,
                                   PROP_HEADERS_VISIBLE,
                                   g_param_spec_boolean ("headers_visible",
							 _("Visible"),
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							 _("Show the column header buttons"),
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							 FALSE,
							 G_PARAM_READWRITE));

  g_object_class_install_property (o_class,
                                   PROP_HEADERS_CLICKABLE,
                                   g_param_spec_boolean ("headers_clickable",
							 _("Headers Clickable"),
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							 _("Column headers respond to click events"),
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							 FALSE,
							 G_PARAM_READWRITE));

  g_object_class_install_property (o_class,
                                   PROP_EXPANDER_COLUMN,
                                   g_param_spec_uint ("expander_column",
						      _("Expand Column"),
						      _("Set the column number for the expander column"),
						      0,
						      G_MAXINT,
						      0,
						      G_PARAM_READWRITE));

  g_object_class_install_property (o_class,
                                   PROP_RULES_HINT,
                                   g_param_spec_boolean ("rules_hint",
							 _("Rules Hint"),
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							 _("Set a hint to the theme engine to draw rows in alternating colors"),
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							 FALSE,
							 G_PARAM_READWRITE));

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  widget_class->set_scroll_adjustments_signal =
    gtk_signal_new ("set_scroll_adjustments",
		    GTK_RUN_LAST,
		    GTK_CLASS_TYPE (object_class),
		    GTK_SIGNAL_OFFSET (GtkTreeViewClass, set_scroll_adjustments),
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		    gtk_marshal_VOID__OBJECT_OBJECT,
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		    GTK_TYPE_NONE, 2,
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		    GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
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  tree_view_signals[ROW_ACTIVATED] =
    gtk_signal_new ("row_activated",
		    GTK_RUN_LAST | GTK_RUN_ACTION,
		    GTK_CLASS_TYPE (object_class),
		    GTK_SIGNAL_OFFSET (GtkTreeViewClass, row_activated),
		    gtk_marshal_VOID__BOXED_OBJECT,
		    GTK_TYPE_NONE, 2,
		    GTK_TYPE_TREE_PATH,
		    GTK_TYPE_TREE_VIEW_COLUMN);
  tree_view_signals[EXPAND_ROW] =
    g_signal_newc ("expand_row",
		   G_TYPE_FROM_CLASS (object_class),
		   G_SIGNAL_RUN_LAST,
		   G_STRUCT_OFFSET (GtkTreeViewClass, expand_row),
		   _gtk_boolean_handled_accumulator, NULL,
		    gtk_marshal_BOOLEAN__BOXED_BOXED,
		   G_TYPE_BOOLEAN, 2,
		   GTK_TYPE_TREE_ITER,
		   GTK_TYPE_TREE_PATH);
  tree_view_signals[COLLAPSE_ROW] =
    g_signal_newc ("collapse_row",
		   G_TYPE_FROM_CLASS (object_class),
		   G_SIGNAL_RUN_LAST,
		   G_STRUCT_OFFSET (GtkTreeViewClass, collapse_row),
		   _gtk_boolean_handled_accumulator, NULL,
		    gtk_marshal_BOOLEAN__BOXED_BOXED,
		   G_TYPE_BOOLEAN, 2,
		   GTK_TYPE_TREE_ITER,
		   GTK_TYPE_TREE_PATH);
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}

static void
gtk_tree_view_init (GtkTreeView *tree_view)
{
  tree_view->priv = g_new0 (GtkTreeViewPrivate, 1);

  GTK_WIDGET_SET_FLAGS (tree_view, GTK_CAN_FOCUS);

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  tree_view->priv->model = NULL;
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  tree_view->priv->flags = GTK_TREE_VIEW_IS_LIST | GTK_TREE_VIEW_SHOW_EXPANDERS | GTK_TREE_VIEW_DRAW_KEYFOCUS | GTK_TREE_VIEW_HEADERS_VISIBLE;
  tree_view->priv->tab_offset = TREE_VIEW_EXPANDER_WIDTH;
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  tree_view->priv->n_columns = 0;
  tree_view->priv->columns = NULL;
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  tree_view->priv->button_pressed_node = NULL;
  tree_view->priv->button_pressed_tree = NULL;
  tree_view->priv->prelight_node = NULL;
  tree_view->priv->header_height = 1;
  tree_view->priv->x_drag = 0;
  tree_view->priv->drag_pos = -1;
  tree_view->priv->selection = NULL;
  tree_view->priv->anchor = NULL;
  tree_view->priv->cursor = NULL;
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  tree_view->priv->header_has_focus = FALSE;
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  tree_view->priv->pressed_button = -1;
  tree_view->priv->press_start_x = -1;
  tree_view->priv->press_start_y = -1;
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  gtk_tree_view_set_adjustments (tree_view, NULL, NULL);
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  _gtk_tree_view_update_size (tree_view);
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}

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/* Object methods
 */

static void
gtk_tree_view_finalize (GObject *object)
{
  GtkTreeView *tree_view = (GtkTreeView *) object;

  g_free (tree_view->priv);
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  if (G_OBJECT_CLASS (parent_class)->finalize)
    (* G_OBJECT_CLASS (parent_class)->finalize) (object);
}

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static void
gtk_tree_view_destroy (GtkObject *object)
{
  GtkTreeView *tree_view = (GtkTreeView *) object;
  GList *list;


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  if (tree_view->priv->tree != NULL)
    {
      gtk_tree_view_unref_tree (tree_view, tree_view->priv->tree);
      _gtk_rbtree_free (tree_view->priv->tree);
      tree_view->priv->tree = NULL;
    }

  if (tree_view->priv->model != NULL)
    {
      g_object_unref (G_OBJECT (tree_view->priv->model));
      tree_view->priv->model = NULL;
    }

  if (tree_view->priv->columns != NULL)
    {
      for (list = tree_view->priv->columns; list; list = list->next)
	g_object_unref (G_OBJECT (list->data));
      g_list_free (tree_view->priv->columns);
      tree_view->priv->columns = NULL;
    }

  if (tree_view->priv->selection != NULL)
    {
      _gtk_tree_selection_set_tree_view (tree_view->priv->selection, NULL);
      g_object_unref (tree_view->priv->selection);
      tree_view->priv->selection = NULL;
    }
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  if (tree_view->priv->anchor != NULL)
    {
      gtk_tree_row_reference_free (tree_view->priv->anchor);
      tree_view->priv->anchor = NULL;
    }

  if (tree_view->priv->scroll_to_path != NULL)
    {
      gtk_tree_path_free (tree_view->priv->scroll_to_path);
      tree_view->priv->scroll_to_path = NULL;
    }

  if (tree_view->priv->drag_dest_row != NULL)
    {
      gtk_tree_row_reference_free (tree_view->priv->drag_dest_row);
      tree_view->priv->drag_dest_row = NULL;
    }

  if (tree_view->priv->cursor)
    {
      gtk_tree_row_reference_free (tree_view->priv->cursor);
      tree_view->priv->cursor = NULL;
    }

  if (GTK_OBJECT_CLASS (parent_class)->destroy)
    (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
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}

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/* Property handlers
 */

static void
gtk_tree_view_set_property (GObject         *object,
			    guint            prop_id,
			    const GValue    *value,
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			    GParamSpec      *pspec)
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{
  GtkTreeView *tree_view;

  tree_view = GTK_TREE_VIEW (object);

  switch (prop_id)
    {
    case PROP_MODEL:
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      gtk_tree_view_set_model (tree_view, GTK_TREE_MODEL (g_value_get_object (value)));
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      break;
    case PROP_HADJUSTMENT:
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      gtk_tree_view_set_hadjustment (tree_view, GTK_ADJUSTMENT (g_value_get_object (value)));
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      break;
    case PROP_VADJUSTMENT:
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      gtk_tree_view_set_vadjustment (tree_view, GTK_ADJUSTMENT (g_value_get_object (value)));
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      break;
    case PROP_HEADERS_VISIBLE:
      gtk_tree_view_set_headers_visible (tree_view, g_value_get_boolean (value));
      break;
    case PROP_HEADERS_CLICKABLE:
      gtk_tree_view_set_headers_clickable (tree_view, g_value_get_boolean (value));
      break;
    case PROP_EXPANDER_COLUMN:
      gtk_tree_view_set_expander_column (tree_view, g_value_get_uint (value));
      break;
    case PROP_RULES_HINT:
      gtk_tree_view_set_rules_hint (tree_view, g_value_get_boolean (value));
      break;
    default:
      break;
    }
}

static void
gtk_tree_view_get_property (GObject         *object,
			    guint            prop_id,
			    GValue          *value,
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			    GParamSpec      *pspec)
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{
  GtkTreeView *tree_view;

  tree_view = GTK_TREE_VIEW (object);
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  switch (prop_id)
    {
    case PROP_MODEL:
      g_value_set_object (value, G_OBJECT (tree_view->priv->model));
      break;
    case PROP_HADJUSTMENT:
      g_value_set_object (value, G_OBJECT (tree_view->priv->hadjustment));
      break;
    case PROP_VADJUSTMENT:
      g_value_set_object (value, G_OBJECT (tree_view->priv->vadjustment));
      break;
    case PROP_HEADERS_VISIBLE:
      g_value_set_boolean (value, gtk_tree_view_get_headers_visible (tree_view));
      break;
    case PROP_HEADERS_CLICKABLE:
      /* g_value_set_boolean (value, gtk_tree_view_get_headers_clickable (tree_view)); */
      break;
    case PROP_EXPANDER_COLUMN:
      g_value_set_uint (value, tree_view->priv->expander_column);
      break;
    case PROP_RULES_HINT:
      g_value_set_boolean (value, tree_view->priv->has_rules);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

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/* Widget methods
 */

static void
gtk_tree_view_realize (GtkWidget *widget)
{
  GList *tmp_list;
  GtkTreeView *tree_view;
  GdkGCValues values;
  GdkWindowAttr attributes;
  gint attributes_mask;

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

  tree_view = GTK_TREE_VIEW (widget);

  gtk_tree_view_check_dirty (GTK_TREE_VIEW (widget));
  GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);

  /* Make the main, clipping window */
  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.x = widget->allocation.x;
  attributes.y = widget->allocation.y;
  attributes.width = widget->allocation.width;
  attributes.height = widget->allocation.height;
  attributes.wclass = GDK_INPUT_OUTPUT;
  attributes.visual = gtk_widget_get_visual (widget);
  attributes.colormap = gtk_widget_get_colormap (widget);
  attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;

  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;

  widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
				   &attributes, attributes_mask);
  gdk_window_set_user_data (widget->window, widget);

  /* Make the window for the tree */
  attributes.x = 0;
  attributes.y = 0;
  attributes.width = tree_view->priv->width;
  attributes.height = tree_view->priv->height + TREE_VIEW_HEADER_HEIGHT (tree_view);
  attributes.event_mask = GDK_EXPOSURE_MASK |
    GDK_SCROLL_MASK |
    GDK_POINTER_MOTION_MASK |
    GDK_ENTER_NOTIFY_MASK |
    GDK_LEAVE_NOTIFY_MASK |
    GDK_BUTTON_PRESS_MASK |
    GDK_BUTTON_RELEASE_MASK |
    gtk_widget_get_events (widget);

  tree_view->priv->bin_window = gdk_window_new (widget->window,
						&attributes, attributes_mask);
  gdk_window_set_user_data (tree_view->priv->bin_window, widget);

  /* Make the column header window */
  attributes.x = 0;
  attributes.y = 0;
  attributes.width = MAX (tree_view->priv->width, widget->allocation.width);
  attributes.height = tree_view->priv->header_height;
  attributes.event_mask = (GDK_EXPOSURE_MASK |
			   GDK_SCROLL_MASK |
			   GDK_BUTTON_PRESS_MASK |
			   GDK_BUTTON_RELEASE_MASK |
			   GDK_KEY_PRESS_MASK |
			   GDK_KEY_RELEASE_MASK) |
    gtk_widget_get_events (widget);

  tree_view->priv->header_window = gdk_window_new (widget->window,
						   &attributes, attributes_mask);
  gdk_window_set_user_data (tree_view->priv->header_window, widget);


  values.foreground = (widget->style->white.pixel==0 ?
		       widget->style->black:widget->style->white);
  values.function = GDK_XOR;
  values.subwindow_mode = GDK_INCLUDE_INFERIORS;
  tree_view->priv->xor_gc = gdk_gc_new_with_values (widget->window,
						    &values,
						    GDK_GC_FOREGROUND |
						    GDK_GC_FUNCTION |
						    GDK_GC_SUBWINDOW);
  /* Add them all up. */
  widget->style = gtk_style_attach (widget->style, widget->window);
  gdk_window_set_background (widget->window, &widget->style->base[widget->state]);
  gdk_window_set_background (tree_view->priv->bin_window, &widget->style->base[widget->state]);
  gtk_style_set_background (widget->style, tree_view->priv->header_window, GTK_STATE_NORMAL);

  tmp_list = tree_view->priv->children;
  while (tmp_list)
    {
      GtkTreeViewChild *child = tmp_list->data;
      tmp_list = tmp_list->next;

      gtk_widget_set_parent_window (child->widget, tree_view->priv->bin_window);
    }
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  for (tmp_list = tree_view->priv->columns; tmp_list; tmp_list = tmp_list->next)
    _gtk_tree_view_column_realize_button (GTK_TREE_VIEW_COLUMN (tmp_list->data));

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  _gtk_tree_view_update_size (GTK_TREE_VIEW (widget));
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  if (tree_view->priv->scroll_to_path != NULL ||
      tree_view->priv->scroll_to_column != NULL)
    {
      gtk_tree_view_scroll_to_cell (tree_view,
				    tree_view->priv->scroll_to_path,
				    tree_view->priv->scroll_to_column,
				    tree_view->priv->scroll_to_row_align,
				    tree_view->priv->scroll_to_col_align);
      if (tree_view->priv->scroll_to_path)
	{
	  gtk_tree_path_free (tree_view->priv->scroll_to_path);
	  tree_view->priv->scroll_to_path = NULL;
	}
      tree_view->priv->scroll_to_column = NULL;
    }
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}

static void
gtk_tree_view_unrealize (GtkWidget *widget)
{
  GtkTreeView *tree_view;
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  GList *list;
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  g_return_if_fail (GTK_IS_TREE_VIEW (widget));

  tree_view = GTK_TREE_VIEW (widget);

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  if (tree_view->priv->scroll_timeout != 0)
    {
      gtk_timeout_remove (tree_view->priv->scroll_timeout);
      tree_view->priv->scroll_timeout = 0;
    }

  if (tree_view->priv->open_dest_timeout != 0)
    {
      gtk_timeout_remove (tree_view->priv->open_dest_timeout);
      tree_view->priv->open_dest_timeout = 0;
    }
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  for (list = tree_view->priv->columns; list; list = list->next)
    _gtk_tree_view_column_unrealize_button (GTK_TREE_VIEW_COLUMN (list->data));

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  gdk_window_set_user_data (tree_view->priv->bin_window, NULL);
  gdk_window_destroy (tree_view->priv->bin_window);
  tree_view->priv->bin_window = NULL;

  gdk_window_set_user_data (tree_view->priv->header_window, NULL);
  gdk_window_destroy (tree_view->priv->header_window);
  tree_view->priv->header_window = NULL;

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  gdk_cursor_destroy (tree_view->priv->cursor_drag);
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  gdk_gc_destroy (tree_view->priv->xor_gc);

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  /* GtkWidget::unrealize destroys children and widget->window */
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  if (GTK_WIDGET_CLASS (parent_class)->unrealize)
    (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
}

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static void
gtk_tree_view_map_buttons (GtkTreeView *tree_view)
{
  GList *list;

  g_return_if_fail (GTK_WIDGET_MAPPED (tree_view));
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  if (GTK_TREE_VIEW_FLAG_SET (tree_view, GTK_TREE_VIEW_HEADERS_VISIBLE))
    {
      GtkTreeViewColumn *column;
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      for (list = tree_view->priv->columns; list; list = list->next)
	{
	  column = list->data;
          if (GTK_WIDGET_VISIBLE (column->button) &&
              !GTK_WIDGET_MAPPED (column->button))
            gtk_widget_map (column->button);
	}
      for (list = tree_view->priv->columns; list; list = list->next)
	{
	  column = list->data;
	  if (column->visible == FALSE)
	    continue;
	  if (column->column_type == GTK_TREE_VIEW_COLUMN_RESIZEABLE)
	    {
	      gdk_window_raise (column->window);
	      gdk_window_show (column->window);
	    }
	  else
	    gdk_window_hide (column->window);
	}
      gdk_window_show (tree_view->priv->header_window);
    }
}

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static void
gtk_tree_view_map (GtkWidget *widget)
{
  GList *tmp_list;
  GtkTreeView *tree_view;

  g_return_if_fail (GTK_IS_TREE_VIEW (widget));

  tree_view = GTK_TREE_VIEW (widget);

  GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);

  tmp_list = tree_view->priv->children;
  while (tmp_list)
    {
      GtkTreeViewChild *child = tmp_list->data;
      tmp_list = tmp_list->next;

      if (GTK_WIDGET_VISIBLE (child->widget))
	{
	  if (!GTK_WIDGET_MAPPED (child->widget))
	    gtk_widget_map (child->widget);
	}
    }
  gdk_window_show (tree_view->priv->bin_window);
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  gtk_tree_view_map_buttons (tree_view);
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  gdk_window_show (widget->window);
}

static void
gtk_tree_view_size_request_buttons (GtkTreeView *tree_view)
{
  GList *list;
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  tree_view->priv->header_height = 1;

  if (GTK_TREE_VIEW_FLAG_SET (tree_view, GTK_TREE_VIEW_MODEL_SETUP))
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    {
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      for (list = tree_view->priv->columns; list; list = list->next)
        {
          GtkRequisition requisition;
          GtkTreeViewColumn *column;
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          column = list->data;
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          gtk_widget_size_request (column->button, &requisition);
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          gtk_tree_view_column_set_width (column, MAX (column->width, requisition.width));
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          tree_view->priv->header_height = MAX (tree_view->priv->header_height, requisition.height);
        }
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    }
}

static void
gtk_tree_view_size_request (GtkWidget      *widget,
			    GtkRequisition *requisition)
{
  GtkTreeView *tree_view;
  GList *tmp_list;

  g_return_if_fail (GTK_IS_TREE_VIEW (widget));

  tree_view = GTK_TREE_VIEW (widget);

  requisition->width = 200;
  requisition->height = 200;

  tmp_list = tree_view->priv->children;

  while (tmp_list)
    {
      GtkTreeViewChild *child = tmp_list->data;
      GtkRequisition child_requisition;

      tmp_list = tmp_list->next;

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      if (GTK_WIDGET_VISIBLE (child->widget))
        gtk_widget_size_request (child->widget, &child_requisition);
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    }
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  gtk_tree_view_size_request_buttons (tree_view);
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}

static void
gtk_tree_view_size_allocate_buttons (GtkWidget *widget)
{
  GtkTreeView *tree_view;
  GList *list;
  GtkTreeViewColumn *column;
  GtkAllocation allocation;
  gint width = 0;
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  tree_view = GTK_TREE_VIEW (widget);

  allocation.y = 0;
  allocation.height = tree_view->priv->header_height;

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  for (list = tree_view->priv->columns; list != NULL; list = list->next)
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    {
      column = list->data;

      if (!column->visible)
	continue;

      allocation.x = width;
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      allocation.width = column->displayed_width;
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      width += column->width;
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      gtk_widget_size_allocate (column->button, &allocation);

      if (column->window)
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	gdk_window_move_resize (column->window,
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                                allocation.x + allocation.width - TREE_VIEW_DRAG_WIDTH/2,
				allocation.y,
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                                TREE_VIEW_DRAG_WIDTH, allocation.height);
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    }
}

static void
gtk_tree_view_size_allocate (GtkWidget     *widget,
			     GtkAllocation *allocation)
{
  GList *tmp_list;
  GtkTreeView *tree_view;

  g_return_if_fail (GTK_IS_TREE_VIEW (widget));

  widget->allocation = *allocation;

  tree_view = GTK_TREE_VIEW (widget);
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  gtk_tree_view_check_dirty (tree_view);
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  tmp_list = tree_view->priv->children;

  while (tmp_list)
    {
      GtkAllocation allocation;
      GtkRequisition requisition;

      GtkTreeViewChild *child = tmp_list->data;
      tmp_list = tmp_list->next;

      allocation.x = child->x;
      allocation.y = child->y;
      gtk_widget_get_child_requisition (child->widget, &requisition);
      allocation.width = requisition.width;
      allocation.height = requisition.height;

      gtk_widget_size_allocate (child->widget, &allocation);
    }

  if (GTK_WIDGET_REALIZED (widget))
    {
      gdk_window_move_resize (widget->window,
			      allocation->x, allocation->y,
			      allocation->width, allocation->height);
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      gdk_window_move_resize (tree_view->priv->header_window,
			      0, 0,
			      MAX (tree_view->priv->width, allocation->width),
			      tree_view->priv->header_height);
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      if (tree_view->priv->width < allocation->width)
	gdk_window_resize (tree_view->priv->bin_window,
			   allocation->width,
			   tree_view->priv->height + TREE_VIEW_HEADER_HEIGHT (tree_view));

      _gtk_tree_view_update_col_width (tree_view);
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    }
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  gtk_tree_view_size_allocate_buttons (widget);

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  tree_view->priv->hadjustment->page_size = allocation->width;
  tree_view->priv->hadjustment->page_increment = allocation->width / 2;
  tree_view->priv->hadjustment->lower = 0;
  tree_view->priv->hadjustment->upper = tree_view->priv->width;
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  if (tree_view->priv->hadjustment->value + allocation->width > tree_view->priv->width)
    tree_view->priv->hadjustment->value = MAX (tree_view->priv->width - allocation->width, 0);
  gtk_signal_emit_by_name (GTK_OBJECT (tree_view->priv->hadjustment), "changed");

  tree_view->priv->vadjustment->page_size = allocation->height - TREE_VIEW_HEADER_HEIGHT (tree_view);
  tree_view->priv->vadjustment->page_increment = (allocation->height - TREE_VIEW_HEADER_HEIGHT (tree_view)) / 2;
  tree_view->priv->vadjustment->lower = 0;
  tree_view->priv->vadjustment->upper = tree_view->priv->height;
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  if (tree_view->priv->vadjustment->value + allocation->height > tree_view->priv->height)
    gtk_adjustment_set_value (tree_view->priv->vadjustment,
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			      MAX (tree_view->priv->height - allocation->height, 0));
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  gtk_signal_emit_by_name (GTK_OBJECT (tree_view->priv->vadjustment), "changed");
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}

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GdkPixmap*
gtk_tree_view_create_row_drag_icon (GtkTreeView  *tree_view,
                                    GtkTreePath  *path)
{
  GtkTreeIter   iter;
  GtkRBTree    *tree;
  GtkRBNode    *node;
  GtkCellRenderer *cell;
  gint i;
  gint cell_offset;
  GList *list;
  GdkRectangle background_area;
  GtkWidget *widget;
  gint depth;
  /* start drawing inside the black outline */
  gint x = 1, y = 1;
  GdkDrawable *drawable;
  gint bin_window_width;
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  widget = GTK_WIDGET (tree_view);

  depth = gtk_tree_path_get_depth (path);

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  _gtk_tree_view_find_node (tree_view,
                            path,
                            &tree,
                            &node);
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  if (tree == NULL)
    return NULL;
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  if (!gtk_tree_model_get_iter (tree_view->priv->model,
                                &iter,
                                path))
    return NULL;
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  cell_offset = x;

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  background_area.y = y;
  background_area.height = BACKGROUND_HEIGHT (node);
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  gdk_drawable_get_size (tree_view->priv->bin_window,
                         &bin_window_width, NULL);
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  drawable = gdk_pixmap_new (tree_view->priv->bin_window,
                             bin_window_width + 2,
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                             background_area.height + 2,
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                             -1);

  gdk_draw_rectangle (drawable,
                      widget->style->base_gc[GTK_WIDGET_STATE (widget)],
                      TRUE,
                      0, 0,
                      bin_window_width + 2,
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                      background_area.height + 2);
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  gdk_draw_rectangle (drawable,
                      widget->style->black_gc,
                      FALSE,
                      0, 0,
                      bin_window_width + 1,
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                      background_area.height + 1);
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  for (i = 0, list = tree_view->priv->columns; i < tree_view->priv->n_columns; i++, list = list->next)
    {
      GtkTreeViewColumn *column = list->data;
      GdkRectangle cell_area;
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      gboolean visible;
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      if (!column->visible)
        continue;

      cell = column->cell;
      gtk_tree_view_column_set_cell_data (column,
                                          tree_view->priv->model,
                                          &iter);

      background_area.x = cell_offset;
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      background_area.width = column->displayed_width;
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      cell_area = background_area;
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      cell_area.y += TREE_VIEW_VERTICAL_SEPARATOR / 2;
      cell_area.height -= TREE_VIEW_VERTICAL_SEPARATOR;
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      if (i == tree_view->priv->expander_column &&
          TREE_VIEW_DRAW_EXPANDERS(tree_view))
        {
          cell_area.x += depth * tree_view->priv->tab_offset;
          cell_area.width -= depth * tree_view->priv->tab_offset;
        }
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      g_object_get (G_OBJECT (cell), "visible", &visible, NULL);
      if (visible)
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	gtk_cell_renderer_render (cell,
				  drawable,
				  widget,
				  &background_area,
				  &cell_area,
				  NULL,
				  0);
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      cell_offset += column->displayed_width;
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    }

  return drawable;
}

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/* Warning: Very scary function.
 * Modify at your own risk
 */
static gboolean
gtk_tree_view_bin_expose (GtkWidget      *widget,
			  GdkEventExpose *event)
{
  GtkTreeView *tree_view;
  GtkTreePath *path;
  GtkRBTree *tree;
  GList *list;
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  GtkRBNode *node;
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  GtkRBNode *cursor = NULL;
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  GtkRBTree *cursor_tree = NULL;
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  GtkRBNode *drag_highlight = NULL;
  GtkRBTree *drag_highlight_tree = NULL;
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  GtkTreeIter iter;
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  GtkCellRenderer *cell;
  gint new_y;
  gint y_offset, x_offset, cell_offset;
  gint i, max_height;
  gint depth;
  GdkRectangle background_area;
  GdkRectangle cell_area;
  guint flags;
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  gint highlight_x;
  gint bin_window_width;
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  GtkTreePath *cursor_path;
  GtkTreePath *drag_dest_path;
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  GList *last_column;

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  g_return_val_if_fail (GTK_IS_TREE_VIEW (widget), FALSE);

  tree_view = GTK_TREE_VIEW (widget);

  if (tree_view->priv->tree == NULL)
    return TRUE;
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  gtk_tree_view_check_dirty (GTK_TREE_VIEW (widget));
  /* we want to account for a potential HEADER offset.
   * That is, if the header exists, we want to offset our event by its
   * height to find the right node.
   */
  new_y = (event->area.y<TREE_VIEW_HEADER_HEIGHT (tree_view))?TREE_VIEW_HEADER_HEIGHT (tree_view):event->area.y;
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  /* y_offset is the */
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  y_offset = -_gtk_rbtree_find_offset (tree_view->priv->tree,
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                                       TREE_WINDOW_Y_TO_RBTREE_Y (tree_view, new_y),
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				       &tree,
				       &node) + new_y - event->area.y;
  if (node == NULL)
    return TRUE;

  /* find the path for the node */
  path = _gtk_tree_view_find_path ((GtkTreeView *)widget,
				   tree,
				   node);
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  gtk_tree_model_get_iter (tree_view->priv->model,
			   &iter,
			   path);
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  depth = gtk_tree_path_get_depth (path);
  gtk_tree_path_free (path);

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  cursor_path = NULL;
  drag_dest_path = NULL;
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  if (tree_view->priv->cursor)
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    cursor_path = gtk_tree_row_reference_get_path (tree_view->priv->cursor);

  if (cursor_path)
    _gtk_tree_view_find_node (tree_view, cursor_path,
                              &cursor_tree, &cursor);
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  if (tree_view->priv->drag_dest_row)
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    drag_dest_path = gtk_tree_row_reference_get_path (tree_view->priv->drag_dest_row);

  if (drag_dest_path)
    _gtk_tree_view_find_node (tree_view, drag_dest_path,
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                              &drag_highlight_tree, &drag_highlight);

  gdk_drawable_get_size (tree_view->priv->bin_window,
                         &bin_window_width, NULL);
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  for (last_column = g_list_last (tree_view->priv->columns);
       last_column &&
	 !(GTK_TREE_VIEW_COLUMN (last_column->data)->visible) &&
	 GTK_WIDGET_CAN_FOCUS (GTK_TREE_VIEW_COLUMN (last_column->data)->button);
       last_column = last_column->prev)
    ;

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  /* Actually process the expose event.  To do this, we want to
   * start at the first node of the event, and walk the tree in
   * order, drawing each successive node.
   */

  do
    {
      /* Need to think about this more.
	 if (tree_view->priv->show_expanders)
	 max_height = MAX (TREE_VIEW_EXPANDER_MIN_HEIGHT, GTK_RBNODE_GET_HEIGHT (node));
	 else
      */
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      gboolean parity;
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      max_height = BACKGROUND_HEIGHT (node);
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      x_offset = -event->area.x;
      cell_offset = 0;
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      highlight_x = 0; /* should match x coord of first cell */
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      background_area.y = y_offset + event->area.y;
      background_area.height = max_height;
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      flags = 0;

      if (GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_IS_PRELIT))
	flags |= GTK_CELL_RENDERER_PRELIT;

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      parity = _gtk_rbtree_node_find_parity (tree, node);
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      if (GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_IS_SELECTED))
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        flags |= GTK_CELL_RENDERER_SELECTED;
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      for (i = 0, list = tree_view->priv->columns; i < tree_view->priv->n_columns; i++, list = list->next)
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	{
	  GtkTreeViewColumn *column = list->data;
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	  const gchar *detail = NULL;
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	  if (!column->visible)
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            continue;
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	  if (cell_offset > event->area.x + event->area.width ||
	      cell_offset + column->displayed_width < event->area.x)
	    {
	      cell_offset += column->displayed_width;
	      continue;
	    }

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          if (column->show_sort_indicator)
            flags |= GTK_CELL_RENDERER_SORTED;
          else
            flags &= ~GTK_CELL_RENDERER_SORTED;
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	  cell = column->cell;
	  gtk_tree_view_column_set_cell_data (column,
					      tree_view->priv->model,
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					      &iter);
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	  background_area.x = cell_offset;
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	  background_area.width = column->displayed_width;
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          cell_area = background_area;
          cell_area.y += TREE_VIEW_VERTICAL_SEPARATOR / 2;
          cell_area.height -= TREE_VIEW_VERTICAL_SEPARATOR;

          /* Select the detail for drawing the cell.  relevant
           * factors are parity, sortedness, and whether to
           * display rules.
           */

          /* FIXME when we have style properties, clean this up.
           */

          if (tree_view->priv->has_rules)
            {
              if (flags & GTK_CELL_RENDERER_SORTED)
                {
                  if (parity)
                    detail = "cell_odd_ruled_sorted";
                  else
                    detail = "cell_even_ruled_sorted";
                }
              else
                {
                  if (parity)
                    detail = "cell_odd_ruled";
                  else
                    detail = "cell_even_ruled";
                }
            }
          else
            {
              if (flags & GTK_CELL_RENDERER_SORTED)
                {
                  if (parity)
                    detail = "cell_odd_sorted";
                  else
                    detail = "cell_even_sorted";
                }
              else
                {
                  if (parity)
                    detail = "cell_odd";
                  else
                    detail = "cell_even";
                }
            }

          g_assert (detail);
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          /* Draw background */
          gtk_paint_flat_box (widget->style,
                              event->window,
                              (flags & GTK_CELL_RENDERER_SELECTED) ?
                              GTK_STATE_SELECTED : GTK_STATE_NORMAL,
                              GTK_SHADOW_NONE,
                              &event->area,
                              widget,
                              detail,
                              background_area.x,
                              background_area.y,
                              background_area.width,
                              background_area.height);
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	  if (i == tree_view->priv->expander_column &&
              TREE_VIEW_DRAW_EXPANDERS(tree_view))
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	    {
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	      gboolean visible;

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	      cell_area.x += depth*tree_view->priv->tab_offset;
	      cell_area.width -= depth*tree_view->priv->tab_offset;
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              /* If we have an expander column, the highlight underline
               * starts with that column, so that it indicates which
               * level of the tree we're dropping at.
               */
              highlight_x = cell_area.x;
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	      g_object_get (G_OBJECT (cell), "visible", &visible, NULL);
	      if (visible)
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		gtk_cell_renderer_render (cell,
					  event->window,
					  widget,
					  &background_area,
					  &cell_area,
					  &event->area,
					  flags);
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	      if ((node->flags & GTK_RBNODE_IS_PARENT) == GTK_RBNODE_IS_PARENT)
		{
		  gint x, y;
		  gdk_window_get_pointer (tree_view->priv->bin_window, &x, &y, 0);
		  gtk_tree_view_draw_arrow (GTK_TREE_VIEW (widget),
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                                            tree,
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					    node,
					    x, y);
		}
	    }
	  else
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	    {
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	      gboolean visible;
	      g_object_get (G_OBJECT (cell), "visible", &visible, NULL);

	      if (visible)
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		gtk_cell_renderer_render (cell,
					  event->window,
					  widget,
					  &background_area,
					  &cell_area,
					  &event->area,
					  flags);
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	    }
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	  cell_offset += column->displayed_width;
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	}

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      if (node == cursor && GTK_WIDGET_HAS_FOCUS (widget))
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	gtk_tree_view_draw_focus (widget);

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      if (node == drag_highlight)
        {
          /* Draw indicator for the drop
           */
          gint highlight_y = -1;
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	  GtkRBTree *tree = NULL;
	  GtkRBNode *node = NULL;
	  gint width;
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          switch (tree_view->priv->drag_dest_pos)
            {
            case GTK_TREE_VIEW_DROP_BEFORE:
              highlight_y = background_area.y - TREE_VIEW_VERTICAL_SEPARATOR/2;
              break;
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            case GTK_TREE_VIEW_DROP_AFTER:
              highlight_y = background_area.y + background_area.height + TREE_VIEW_VERTICAL_SEPARATOR/2;
              break;
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            case GTK_TREE_VIEW_DROP_INTO_OR_BEFORE:
            case GTK_TREE_VIEW_DROP_INTO_OR_AFTER:
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	      _gtk_tree_view_find_node (tree_view, drag_dest_path, &tree, &node);

	      if (tree == NULL)
		break;
	      gdk_drawable_get_size (tree_view->priv->bin_window,
				     &width, NULL);
	      gtk_paint_focus (widget->style,
			       tree_view->priv->bin_window,
			       NULL,
			       widget,
			       "add-mode",
			       0, BACKGROUND_FIRST_PIXEL (tree_view, tree, node),
			       width - 1, BACKGROUND_HEIGHT (node) - 1);

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              break;
            }

          if (highlight_y >= 0)
            {
              gdk_draw_line (event->window,
                             widget->style->black_gc,
                             highlight_x,
                             highlight_y,
                             bin_window_width - highlight_x,
                             highlight_y);
            }
        }
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      y_offset += max_height;
      if (node->children)
	{
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	  GtkTreeIter parent = iter;
	  gboolean has_child;

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	  tree = node->children;
	  node = tree->root;
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          g_assert (node != tree->nil);
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	  while (node->left != tree->nil)
	    node = node->left;
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	  has_child = gtk_tree_model_iter_children (tree_view->priv->model,
						    &iter,
						    &parent);
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	  cell = gtk_tree_view_get_column (tree_view, 0)->cell;
	  depth++;

	  /* Sanity Check! */
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	  TREE_VIEW_INTERNAL_ASSERT (has_child, FALSE);
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	}
      else
	{
	  gboolean done = FALSE;
	  do
	    {
	      node = _gtk_rbtree_next (tree, node);
	      if (node != NULL)
		{
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		  gboolean has_next = gtk_tree_model_iter_next (tree_view->priv->model, &iter);
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		  cell = gtk_tree_view_get_column (tree_view, 0)->cell;
		  done = TRUE;

		  /* Sanity Check! */
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		  TREE_VIEW_INTERNAL_ASSERT (has_next, FALSE);
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		}
	      else
		{
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		  GtkTreeIter parent_iter = iter;
		  gboolean has_parent;

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		  node = tree->parent_node;
		  tree = tree->parent_tree;
		  if (tree == NULL)
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		    /* we've run out of tree.  It's okay to return though, as
		     * we'd only break out of the while loop below. */
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		    return TRUE;
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		  has_parent = gtk_tree_model_iter_parent (tree_view->priv->model,
							   &iter,
							   &parent_iter);
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		  depth--;

		  /* Sanity check */
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		  TREE_VIEW_INTERNAL_ASSERT (has_parent, FALSE);
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		}
	    }
	  while (!done);
	}
    }
  while (y_offset < event->area.height);
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  if (cursor_path)
    gtk_tree_path_free (cursor_path);

  if (drag_dest_path)
    gtk_tree_path_free (drag_dest_path);
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  return TRUE;
}

static gboolean
gtk_tree_view_expose (GtkWidget      *widget,
		      GdkEventExpose *event)
{
  GtkTreeView *tree_view;

  g_return_val_if_fail (GTK_IS_TREE_VIEW (widget), FALSE);

  tree_view = GTK_TREE_VIEW (widget);

  if (event->window == tree_view->priv->bin_window)
    return gtk_tree_view_bin_expose (widget, event);

  return TRUE;
}

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