gtktreeview.c 106 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"
#include "gtktreeprivate.h"
#include "gtkcellrenderer.h"
#include "gtksignal.h"
#include "gtkmain.h"
#include "gtkbutton.h"
#include "gtkalignment.h"
#include "gtklabel.h"

#include <gdk/gdkkeysyms.h>


/* the width of the column resize windows */
#define TREE_VIEW_DRAG_WIDTH 6
#define TREE_VIEW_EXPANDER_WIDTH 14
#define TREE_VIEW_EXPANDER_HEIGHT 14
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#define TREE_VIEW_VERTICAL_SEPARATOR 2
#define TREE_VIEW_HORIZONTAL_SEPARATOR 0
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typedef struct _GtkTreeViewChild GtkTreeViewChild;

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


static void     gtk_tree_view_init                 (GtkTreeView      *tree_view);
static void     gtk_tree_view_class_init           (GtkTreeViewClass *klass);

/* 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);
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);

/* 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_changed              (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_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_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);

/* Internal functions */
static void     gtk_tree_view_draw_arrow           (GtkTreeView      *tree_view,
						    GtkRBNode        *node,
						    gint              offset,
						    gint              x,
						    gint              y);
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);
static void     gtk_tree_view_create_button        (GtkTreeView      *tree_view,
						    gint              i);
static void     gtk_tree_view_create_buttons       (GtkTreeView      *tree_view);
static void     gtk_tree_view_button_clicked       (GtkWidget        *widget,
						    gpointer          data);
static void     gtk_tree_view_clamp_node_visible   (GtkTreeView      *tree_view,
						    GtkRBTree        *tree,
						    GtkRBNode        *node);



static GtkContainerClass *parent_class = NULL;


/* 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)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
  GtkContainerClass *container_class;

  object_class = (GtkObjectClass*) class;
  widget_class = (GtkWidgetClass*) class;
  container_class = (GtkContainerClass*) class;
  parent_class = g_type_class_peek_parent (class);

  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->draw_focus = gtk_tree_view_draw_focus;
  widget_class->focus_in_event = gtk_tree_view_focus_in;
  widget_class->focus_out_event = gtk_tree_view_focus_out;

  container_class->forall = gtk_tree_view_forall;
  container_class->remove = gtk_tree_view_remove;
  container_class->focus = gtk_tree_view_focus;

  class->set_scroll_adjustments = gtk_tree_view_set_adjustments;

  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__POINTER_POINTER,
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		    GTK_TYPE_NONE, 2,
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		    GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
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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);

  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->prelight_offset = 0;
  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;
  gtk_tree_view_set_adjustments (tree_view, NULL, NULL);
  _gtk_tree_view_set_size (tree_view, 0, 0);
}

/* Widget methods
 */

static void
gtk_tree_view_realize_buttons (GtkTreeView *tree_view)
{
  GList *list;
  GtkTreeViewColumn *column;
  GdkWindowAttr attr;
  guint attributes_mask;

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  g_return_if_fail (GTK_WIDGET_REALIZED (tree_view));
  g_return_if_fail (tree_view->priv->header_window != NULL);
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  attr.window_type = GDK_WINDOW_CHILD;
  attr.wclass = GDK_INPUT_ONLY;
  attr.visual = gtk_widget_get_visual (GTK_WIDGET (tree_view));
  attr.colormap = gtk_widget_get_colormap (GTK_WIDGET (tree_view));
  attr.event_mask = gtk_widget_get_events (GTK_WIDGET (tree_view));
  attr.event_mask = (GDK_BUTTON_PRESS_MASK |
		     GDK_BUTTON_RELEASE_MASK |
		     GDK_POINTER_MOTION_MASK |
		     GDK_POINTER_MOTION_HINT_MASK |
		     GDK_KEY_PRESS_MASK);
  attributes_mask = GDK_WA_CURSOR | GDK_WA_X | GDK_WA_Y;
  attr.cursor = gdk_cursor_new (GDK_SB_H_DOUBLE_ARROW);
  tree_view->priv->cursor_drag = attr.cursor;

  attr.y = 0;
  attr.width = TREE_VIEW_DRAG_WIDTH;
  attr.height = tree_view->priv->header_height;

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  for (list = tree_view->priv->columns; list; list = list->next)
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    {
      column = list->data;
      if (column->button)
	{
	  if (column->visible == FALSE)
	    continue;
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	  if (column->window != NULL)
	    continue;

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	  gtk_widget_set_parent_window (column->button,
					tree_view->priv->header_window);

	  attr.x = (column->button->allocation.x + column->button->allocation.width) - 3;
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	  column->window = gdk_window_new (tree_view->priv->header_window,
					   &attr, attributes_mask);
	  gdk_window_set_user_data (column->window, tree_view);
	}
    }
}

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);

  if (!GTK_TREE_VIEW_FLAG_SET (tree_view, GTK_TREE_VIEW_MODEL_SETUP) &&
      tree_view->priv->model)
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    gtk_tree_view_setup_model (tree_view);
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  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);
    }
  gtk_tree_view_realize_buttons (GTK_TREE_VIEW (widget));
  _gtk_tree_view_set_size (GTK_TREE_VIEW (widget), -1, -1);
}

static void
gtk_tree_view_unrealize (GtkWidget *widget)
{
  GtkTreeView *tree_view;

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

  tree_view = GTK_TREE_VIEW (widget);

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  /* FIXME where do we clear column->window for each column? */
  
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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;

  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));
  
  if (GTK_TREE_VIEW_FLAG_SET (tree_view, GTK_TREE_VIEW_HEADERS_VISIBLE))
    {
      GtkTreeViewColumn *column;
      
      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 (widget != NULL);
  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);
  
  gdk_window_show (widget->window);
}

static void
gtk_tree_view_size_request_buttons (GtkTreeView *tree_view)
{
  GList *list;
  
  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;
          
          column = list->data;
          
          gtk_widget_size_request (column->button, &requisition);
          
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          column->width = 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 (widget != NULL);
  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;
  GList *last_column;
  GtkTreeViewColumn *column;
  GtkAllocation allocation;
  gint width = 0;

  tree_view = GTK_TREE_VIEW (widget);

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

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  for (last_column = g_list_last (tree_view->priv->columns);
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       last_column && !(GTK_TREE_VIEW_COLUMN (last_column->data)->visible);
       last_column = last_column->prev)
    ;

  if (last_column == NULL)
    return;

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

      if (!column->visible)
	continue;

      allocation.x = width;
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      allocation.width = column->width;
      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,
                                width - TREE_VIEW_DRAG_WIDTH/2, allocation.y,
                                TREE_VIEW_DRAG_WIDTH, allocation.height);
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    }
  column = list->data;
  allocation.x = width;
  allocation.width = MAX (widget->allocation.width, tree_view->priv->width) - width;
  gtk_widget_size_allocate (column->button, &allocation);
  if (column->window)
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    gdk_window_move_resize (column->window,
                            allocation.x + allocation.width - TREE_VIEW_DRAG_WIDTH/2,
                            0,
                            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 (widget != NULL);
  g_return_if_fail (GTK_IS_TREE_VIEW (widget));

  widget->allocation = *allocation;

  tree_view = GTK_TREE_VIEW (widget);

  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);
      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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  /* FIXME I don't think the invariant that the model must be setup
   * before touching the buttons is maintained in most of the
   * rest of the code, e.g. in realize, so something is wrong
   */
  if (GTK_TREE_VIEW_FLAG_SET (tree_view, GTK_TREE_VIEW_MODEL_SETUP))
    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;
  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;
  if (tree_view->priv->vadjustment->value + allocation->height > tree_view->priv->height)
    gtk_adjustment_set_value (tree_view->priv->vadjustment,
			      (gfloat) MAX (tree_view->priv->height - allocation->height, 0));
  gtk_signal_emit_by_name (GTK_OBJECT (tree_view->priv->vadjustment), "changed");
}

/* 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;
  GtkRBNode *node, *last_node = NULL;
  GtkRBNode *cursor = NULL;
  GtkRBTree *cursor_tree = NULL, *last_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;
  gboolean last_selected;

  g_return_val_if_fail (widget != NULL, FALSE);
  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;

  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;
  y_offset = -_gtk_rbtree_find_offset (tree_view->priv->tree,
				       new_y - TREE_VIEW_HEADER_HEIGHT (tree_view),
				       &tree,
				       &node) + new_y - event->area.y;
  if (node == NULL)
    return TRUE;

  /* See if the last node was selected */
  _gtk_rbtree_prev_full (tree, node, &last_tree, &last_node);
  last_selected = (last_node && GTK_RBNODE_FLAG_SET (last_node, GTK_RBNODE_IS_SELECTED));

  /* 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);

  if (tree_view->priv->cursor)
    _gtk_tree_view_find_node (tree_view, tree_view->priv->cursor, &cursor_tree, &cursor);

  /* 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
      */
      max_height = GTK_RBNODE_GET_HEIGHT (node);

      x_offset = -event->area.x;
      cell_offset = 0;

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      background_area.y = y_offset + event->area.y + TREE_VIEW_VERTICAL_SEPARATOR;
      background_area.height = max_height - TREE_VIEW_VERTICAL_SEPARATOR;
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      flags = 0;

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

      if (GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_IS_SELECTED))
	{
	  flags |= GTK_CELL_RENDERER_SELECTED;

	  /* Draw the selection */
	  gdk_draw_rectangle (event->window,
			      GTK_WIDGET (tree_view)->style->bg_gc [GTK_STATE_SELECTED],
			      TRUE,
			      event->area.x,
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			      background_area.y - (last_selected?TREE_VIEW_VERTICAL_SEPARATOR:0),
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			      event->area.width,
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			      background_area.height + (last_selected?TREE_VIEW_VERTICAL_SEPARATOR:0));
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	  last_selected = TRUE;
	}
      else
	{
	  last_selected = FALSE;
	}

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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;

	  if (!column->visible)
	    continue;

	  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 = TREE_VIEW_COLUMN_WIDTH (column);
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	  if (i == 0 && TREE_VIEW_DRAW_EXPANDERS(tree_view))
	    {
	      cell_area = background_area;
	      cell_area.x += depth*tree_view->priv->tab_offset;
	      cell_area.width -= depth*tree_view->priv->tab_offset;
	      gtk_cell_renderer_render (cell,
					event->window,
					widget,
					&background_area,
					&cell_area,
					&event->area,
					flags);
	      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),
					    node,
					    event->area.y + y_offset,
					    x, y);
		}
	    }
	  else
	    {
	      cell_area = background_area;
	      gtk_cell_renderer_render (cell,
					event->window,
					widget,
					&background_area,
					&cell_area,
					&event->area,
					flags);
	    }
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	  cell_offset += TREE_VIEW_COLUMN_WIDTH (column);
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	}

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

      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;
	  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);

  return TRUE;
}

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

  g_return_val_if_fail (widget != NULL, FALSE);
  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;
}

static gboolean
gtk_tree_view_motion (GtkWidget *widget,
		      GdkEventMotion  *event)
{
  GtkTreeView *tree_view;
  GtkRBTree *tree;
  GtkRBNode *node;
  gint new_y;
  gint y_offset;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_TREE_VIEW (widget), FALSE);

  tree_view = GTK_TREE_VIEW (widget);
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  if (GTK_TREE_VIEW_FLAG_SET (tree_view, GTK_TREE_VIEW_IN_COLUMN_RESIZE))
    {
      gint x;
      gint new_width;

      if (event->is_hint || event->window != widget->window)
	gtk_widget_get_pointer (widget, &x, NULL);
      else
	x = event->x;

      new_width = gtk_tree_view_new_column_width (GTK_TREE_VIEW (widget), tree_view->priv->drag_pos, &x);
      if (x != tree_view->priv->x_drag)
	{
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	  gtk_tree_view_column_set_width (gtk_tree_view_get_column (GTK_TREE_VIEW (widget), tree_view->priv->drag_pos), new_width);
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	}

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      /* FIXME: Do we need to scroll */
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      _gtk_tree_view_set_size (GTK_TREE_VIEW (widget), -1, tree_view->priv->height);
      return FALSE;
    }

  /* Sanity check it */
  if (event->window != tree_view->priv->bin_window)
    return FALSE;
  if (tree_view->priv->tree == NULL)
    return FALSE;
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  if (tree_view->priv->prelight_node != NULL)
    {
      if ((((gint) event->y - TREE_VIEW_HEADER_HEIGHT (tree_view) < tree_view->priv->prelight_offset) ||
	   ((gint) event->y - TREE_VIEW_HEADER_HEIGHT (tree_view) >=
	    (tree_view->priv->prelight_offset + GTK_RBNODE_GET_HEIGHT (tree_view->priv->prelight_node))) ||
	   ((gint) event->x > tree_view->priv->tab_offset)))
	/* We need to unprelight the old one. */
	{
	  if (GTK_TREE_VIEW_FLAG_SET (tree_view, GTK_TREE_VIEW_ARROW_PRELIT))
	    {
	      GTK_RBNODE_UNSET_FLAG (tree_view->priv->prelight_node, GTK_RBNODE_IS_PRELIT);
	      gtk_tree_view_draw_arrow (GTK_TREE_VIEW (widget),
					tree_view->priv->prelight_node,
					tree_view->priv->prelight_offset,
					event->x,
					event->y);
	      GTK_TREE_VIEW_UNSET_FLAG (tree_view, GTK_TREE_VIEW_ARROW_PRELIT);
	    }

	  GTK_RBNODE_UNSET_FLAG (tree_view->priv->prelight_node, GTK_RBNODE_IS_PRELIT);
	  tree_view->priv->prelight_node = NULL;
	  tree_view->priv->prelight_tree = NULL;
	  tree_view->priv->prelight_offset = 0;
	}
    }

  new_y = ((gint)event->y<TREE_VIEW_HEADER_HEIGHT (tree_view))?TREE_VIEW_HEADER_HEIGHT (tree_view):(gint)event->y;
  y_offset = -_gtk_rbtree_find_offset (tree_view->priv->tree, new_y - TREE_VIEW_HEADER_HEIGHT (tree_view),
				       &tree,
				       &node) + new_y - (gint)event->y;

  if (node == NULL)
    return TRUE;

  /* If we are currently pressing down a button, we don't want to prelight anything else. */
  if ((tree_view->priv->button_pressed_node != NULL) &&
      (tree_view->priv->button_pressed_node != node))
    return TRUE;

  /* Do we want to prelight a tab? */