gtk2/gtk/gtktree.c

/* GTK - The GIMP Toolkit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include "gtktree.h"
#include "gtktreeitem.h"
#include "gtkmain.h"
#include "gtksignal.h"
#include "gtklist.h"

enum {
  SELECTION_CHANGED,
  SELECT_CHILD,
  UNSELECT_CHILD,
  LAST_SIGNAL
};

typedef void (*GtkTreeSignal) (GtkObject *object,
			       gpointer   arg1,
			       gpointer   data);


static void gtk_tree_class_init      (GtkTreeClass   *klass);
static void gtk_tree_init            (GtkTree        *tree);
static void gtk_tree_destroy         (GtkObject      *object);
static void gtk_tree_map             (GtkWidget      *widget);
static void gtk_tree_unmap           (GtkWidget      *widget);
static void gtk_tree_realize         (GtkWidget      *widget);
static void gtk_tree_draw            (GtkWidget      *widget,
				      GdkRectangle   *area);
static gint gtk_tree_expose          (GtkWidget      *widget,
				      GdkEventExpose *event);
static gint gtk_tree_motion_notify   (GtkWidget      *widget,
				      GdkEventMotion *event);
static gint gtk_tree_button_press    (GtkWidget      *widget,
				      GdkEventButton *event);
static gint gtk_tree_button_release  (GtkWidget      *widget,
				      GdkEventButton *event);
static void gtk_tree_size_request    (GtkWidget      *widget,
				      GtkRequisition *requisition);
static void gtk_tree_size_allocate   (GtkWidget      *widget,
				      GtkAllocation  *allocation);
static void gtk_tree_add             (GtkContainer   *container,
				      GtkWidget      *widget);
static void gtk_tree_remove          (GtkContainer   *container,
				      GtkWidget      *widget);
static void gtk_tree_foreach         (GtkContainer   *container,
				      GtkCallback     callback,
				      gpointer        callback_data);

static void gtk_real_tree_select_child   (GtkTree       *tree,
					  GtkWidget     *child);
static void gtk_real_tree_unselect_child (GtkTree       *tree,
					  GtkWidget     *child);

static void gtk_tree_marshal_signal (GtkObject      *object,
				     GtkSignalFunc   func,
				     gpointer        func_data,
				     GtkArg         *args);

static GtkContainerClass *parent_class = NULL;
static gint tree_signals[LAST_SIGNAL] = { 0 };

guint
gtk_tree_get_type ()
{
  static guint tree_type = 0;

  if (!tree_type)
    {
      GtkTypeInfo tree_info =
      {
	"GtkTree",
	sizeof (GtkTree),
	sizeof (GtkTreeClass),
	(GtkClassInitFunc) gtk_tree_class_init,
	(GtkObjectInitFunc) gtk_tree_init,
	(GtkArgSetFunc) NULL,
        (GtkArgGetFunc) NULL,
      };

      tree_type = gtk_type_unique (gtk_container_get_type (), &tree_info);
    }

  return tree_type;
}

static void
gtk_tree_class_init (GtkTreeClass *class)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
  GtkContainerClass *container_class;

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

  parent_class = gtk_type_class (gtk_container_get_type ());

  tree_signals[SELECTION_CHANGED] =
    gtk_signal_new ("selection_changed",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkTreeClass, selection_changed),
		    gtk_signal_default_marshaller,
		    GTK_TYPE_NONE, 0);
  tree_signals[SELECT_CHILD] =
    gtk_signal_new ("select_child",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkTreeClass, select_child),
		    gtk_tree_marshal_signal,
		    GTK_TYPE_NONE, 1,
		    GTK_TYPE_WIDGET);
  tree_signals[UNSELECT_CHILD] =
    gtk_signal_new ("unselect_child",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkTreeClass, unselect_child),
		    gtk_tree_marshal_signal,
		    GTK_TYPE_NONE, 1,
		    GTK_TYPE_WIDGET);

  gtk_object_class_add_signals (object_class, tree_signals, LAST_SIGNAL);

  object_class->destroy = gtk_tree_destroy;

  widget_class->map = gtk_tree_map;
  widget_class->unmap = gtk_tree_unmap;
  widget_class->realize = gtk_tree_realize;
  widget_class->draw = gtk_tree_draw;
  widget_class->expose_event = gtk_tree_expose;
  widget_class->motion_notify_event = gtk_tree_motion_notify;
  widget_class->button_press_event = gtk_tree_button_press;
  widget_class->button_release_event = gtk_tree_button_release;
  widget_class->size_request = gtk_tree_size_request;
  widget_class->size_allocate = gtk_tree_size_allocate;

  container_class->add = gtk_tree_add;
  container_class->remove = gtk_tree_remove;
  container_class->foreach = gtk_tree_foreach;

  class->selection_changed = NULL;
  class->select_child = gtk_real_tree_select_child;
  class->unselect_child = gtk_real_tree_unselect_child;
}

static void
gtk_tree_init (GtkTree *tree)
{
  tree->children = NULL;
  tree->root_tree = NULL;
  tree->selection = NULL;
  tree->tree_owner = NULL;
  tree->selection_mode = GTK_SELECTION_SINGLE;
  tree->indent_value = 9;
  tree->current_indent = 0;
  tree->level = 0;
  tree->view_mode = GTK_TREE_VIEW_LINE;
  tree->view_line = 1;
}

GtkWidget*
gtk_tree_new ()
{
  return GTK_WIDGET (gtk_type_new (gtk_tree_get_type ()));
}

void
gtk_tree_append (GtkTree   *tree,
		 GtkWidget *child)
{

  g_return_if_fail (tree != NULL);
  g_return_if_fail (GTK_IS_TREE_ITEM (child));

  gtk_tree_insert(tree, child, -1);
}

void
gtk_tree_prepend (GtkTree   *tree,
		  GtkWidget *child)
{
  g_return_if_fail (tree != NULL);
  g_return_if_fail (GTK_IS_TREE_ITEM (child));

  gtk_tree_insert(tree, child, 0);

}

void
gtk_tree_insert (GtkTree   *tree,
		 GtkWidget *child,
		 gint       position)
{
  gint nchildren;
    
  g_return_if_fail (tree != NULL || child != NULL);
  g_return_if_fail (GTK_IS_TREE_ITEM(child));

  /* set parent widget to item */
  gtk_widget_set_parent (child, GTK_WIDGET (tree));
    
  if (GTK_WIDGET_VISIBLE (child->parent))
    {
      if (GTK_WIDGET_REALIZED (child->parent) &&
	  !GTK_WIDGET_REALIZED (child))
	gtk_widget_realize (child);

      if (GTK_WIDGET_MAPPED (child->parent) &&
	  !GTK_WIDGET_MAPPED (child))
	gtk_widget_map (child);
    }

  nchildren = g_list_length (tree->children);
    
  if ((position < 0) || (position > nchildren))
    position = nchildren;

  if (position == nchildren)
    {
      tree->children = g_list_append(tree->children, child);
    }
  else
    {
      g_list_insert(tree->children, child, position);
    }
    
  if (GTK_WIDGET_VISIBLE (tree))
    gtk_widget_queue_resize (GTK_WIDGET (tree));

}

static void
gtk_tree_add (GtkContainer *container,
	      GtkWidget    *widget)
{
  GtkTree *tree;

  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_TREE (container));
  g_return_if_fail (widget != NULL);

  tree = GTK_TREE (container);

  gtk_widget_set_parent (widget, GTK_WIDGET (container));
  if (GTK_WIDGET_VISIBLE (widget->parent))
    {
      if (GTK_WIDGET_REALIZED (widget->parent) &&
	  !GTK_WIDGET_REALIZED (widget))
	gtk_widget_realize (widget);

      if (GTK_WIDGET_MAPPED (widget->parent) &&
	  !GTK_WIDGET_MAPPED (widget))
	gtk_widget_map (widget);
    }

  tree->children = g_list_append (tree->children, widget);

  if (!tree->selection && (tree->selection_mode == GTK_SELECTION_BROWSE))
    {
      gtk_tree_select_child (tree, widget);
    }

  if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (container))
    gtk_widget_queue_resize (widget);

}

static gint
gtk_tree_button_press (GtkWidget      *widget,
		       GdkEventButton *event)
{
  GtkTree *tree;
  GtkWidget *item;

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

  tree = GTK_TREE (widget);
  item = gtk_get_event_widget ((GdkEvent*) event);

  while (!gtk_type_is_a (GTK_WIDGET_TYPE (item), gtk_tree_item_get_type ()))
    item = item->parent;

  switch(event->button) 
    {
    case 1:
      gtk_tree_select_child (tree, item);
      break;
    case 2:
      if(GTK_TREE_ITEM(item)->subtree) gtk_tree_item_expand(GTK_TREE_ITEM(item));
      break;
    case 3:
      if(GTK_TREE_ITEM(item)->subtree) gtk_tree_item_collapse(GTK_TREE_ITEM(item));
      break;
    }

  return TRUE;
}

static gint
gtk_tree_button_release (GtkWidget      *widget,
			 GdkEventButton *event)
{
  GtkTree *tree;
  GtkWidget *item;

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

  tree = GTK_TREE (widget);
  item = gtk_get_event_widget ((GdkEvent*) event);

  return TRUE;
}

gint
gtk_tree_child_position (GtkTree   *tree,
			 GtkWidget *child)
{
  GList *children;
  gint pos;


  g_return_val_if_fail (tree != NULL, -1);
  g_return_val_if_fail (GTK_IS_TREE (tree), -1);
  g_return_val_if_fail (child != NULL, -1);

  pos = 0;
  children = tree->children;

  while (children)
    {
      if (child == GTK_WIDGET (children->data)) 
	return pos;

      pos += 1;
      children = children->next;
    }


  return -1;
}

void
gtk_tree_clear_items (GtkTree *tree,
		      gint     start,
		      gint     end)
{
  g_return_if_fail (tree != NULL);
  g_return_if_fail (GTK_IS_TREE (tree));

}

static void
gtk_tree_destroy (GtkObject *object)
{
  GtkTree *tree;
  GtkWidget *child;
  GList *children;

  g_return_if_fail (object != NULL);
  g_return_if_fail (GTK_IS_TREE (object));

  tree = GTK_TREE (object);

  children = tree->children;
  while (children)
    {
      child = children->data;
      children = children->next;
      
      gtk_widget_ref (child);
      gtk_widget_unparent (child);
      gtk_widget_destroy (child);
      gtk_widget_unref (child);
    }

  g_list_free (tree->children);
  tree->children = NULL;

  if (tree->root_tree == tree)
    {
      GList *node;
      for (node = tree->selection; node; node = node->next)
	gtk_widget_unref ((GtkWidget *)node->data);
      g_list_free (tree->selection);
      tree->selection = NULL;
    }

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

static void
gtk_tree_draw (GtkWidget    *widget,
	       GdkRectangle *area)
{
  GtkTree *tree;
  GtkWidget *subtree;
  GtkWidget *child;
  GdkRectangle child_area;
  GList *children;


  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_TREE (widget));
  g_return_if_fail (area != NULL);

  if (GTK_WIDGET_DRAWABLE (widget))
    {
      tree = GTK_TREE (widget);

      children = tree->children;
      while (children)
	{
	  child = children->data;
	  children = children->next;

	  if (gtk_widget_intersect (child, area, &child_area))
	    gtk_widget_draw (child, &child_area);

	  if((subtree = GTK_TREE_ITEM(child)->subtree) &&
	     GTK_WIDGET_VISIBLE(subtree) &&
	     gtk_widget_intersect (subtree, area, &child_area))
	    gtk_widget_draw (subtree, &child_area);
	}
    }

}

static gint
gtk_tree_expose (GtkWidget      *widget,
		 GdkEventExpose *event)
{
  GtkTree *tree;
  GtkWidget *child;
  GdkEventExpose child_event;
  GList *children;


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

  if (GTK_WIDGET_DRAWABLE (widget))
    {
      tree = GTK_TREE (widget);

      child_event = *event;

      children = tree->children;
      while (children)
	{
	  child = children->data;
	  children = children->next;

	  if (GTK_WIDGET_NO_WINDOW (child) &&
	      gtk_widget_intersect (child, &event->area, &child_event.area))
	    gtk_widget_event (child, (GdkEvent*) &child_event);
	}
    }


  return FALSE;
}

static void
gtk_tree_foreach (GtkContainer *container,
		  GtkCallback   callback,
		  gpointer      callback_data)
{
  GtkTree *tree;
  GtkWidget *child;
  GList *children;


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

  tree = GTK_TREE (container);
  children = tree->children;

  while (children)
    {
      child = children->data;
      children = children->next;

      (* callback) (child, callback_data);

      if(GTK_TREE_ITEM(child)->subtree)
	(* callback)(GTK_TREE_ITEM(child)->subtree, callback_data);
    }
}

static void
gtk_tree_map (GtkWidget *widget)
{
  GtkTree *tree;
  GtkWidget *child;
  GList *children;


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

  GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
  tree = GTK_TREE (widget);

  gdk_window_show (widget->window);

  if(GTK_IS_TREE(widget->parent)) 
    {
      /* set root tree for this tree */
      tree->root_tree = GTK_TREE(widget->parent)->root_tree;

      tree->level = GTK_TREE(GTK_WIDGET(tree)->parent)->level+1;
      tree->indent_value = GTK_TREE(GTK_WIDGET(tree)->parent)->indent_value;
      tree->current_indent = GTK_TREE(GTK_WIDGET(tree)->parent)->current_indent + 
	tree->indent_value;
      tree->view_mode = GTK_TREE(GTK_WIDGET(tree)->parent)->view_mode;
      tree->view_line = GTK_TREE(GTK_WIDGET(tree)->parent)->view_line;
    } 
  else
    tree->root_tree = tree;

  children = tree->children;
  while (children)
    {
      child = children->data;
      children = children->next;

      if (GTK_WIDGET_VISIBLE (child) &&
	  !GTK_WIDGET_MAPPED (child))
	gtk_widget_map (child);

      if ((child = GTK_WIDGET(GTK_TREE_ITEM(child)->subtree)) &&
	  GTK_WIDGET_VISIBLE (child) &&
	  !GTK_WIDGET_MAPPED (child))
	gtk_widget_map (child);
    }
}

static void
gtk_tree_marshal_signal (GtkObject      *object,
			 GtkSignalFunc   func,
			 gpointer        func_data,
			 GtkArg         *args)
{
  GtkTreeSignal rfunc;

  rfunc = (GtkTreeSignal) func;

  (* rfunc) (object, GTK_VALUE_OBJECT (args[0]), func_data);
}

static gint
gtk_tree_motion_notify (GtkWidget      *widget,
			GdkEventMotion *event)
{
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_TREE (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  g_print("gtk_tree_motion_notify\n");

  return FALSE;
}

static void
gtk_tree_realize (GtkWidget *widget)
{
  GdkWindowAttr attributes;
  gint attributes_mask;


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

  GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);

  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_EXPOSURE_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);

  widget->style = gtk_style_attach (widget->style, widget->window);
  gdk_window_set_background (widget->window, 
			     &widget->style->base[GTK_STATE_NORMAL]);

}

static void
gtk_tree_remove (GtkContainer *container,
		 GtkWidget    *widget)
{
  GList *item_list;

  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_TREE (container));
  g_return_if_fail (widget != NULL);
  g_return_if_fail (container == GTK_CONTAINER (widget->parent));

  item_list = g_list_alloc ();
  item_list->data = widget;
  
  gtk_tree_remove_items (GTK_TREE (container), item_list);

  g_list_free (item_list);
}

void
gtk_tree_remove_items (GtkTree *tree,
		       GList   *items)
{
  GtkWidget *widget;
  GList *selected_widgets;
  GList *tmp_list;
  GtkTree *real_tree, *root_tree;

  g_return_if_fail (tree != NULL);
  g_return_if_fail (GTK_IS_TREE (tree));

  root_tree = GTK_TREE(GTK_TREE_ROOT_TREE(tree));
  tmp_list = items;
  selected_widgets = NULL;
  widget = NULL;

  while (tmp_list)
    {
      widget = tmp_list->data;
      tmp_list = tmp_list->next;

      /* get real owner of this widget */
      real_tree = GTK_TREE(widget->parent);
      
      if (widget->state == GTK_STATE_SELECTED)
	selected_widgets = g_list_prepend (selected_widgets, widget);

      /* remove this item of his real parent */
      real_tree->children = g_list_remove (real_tree->children, widget);

      /* delete subtree if there is no children in it */
      if(real_tree->children == NULL && 
	 real_tree != root_tree)
	{
	  gtk_tree_item_remove_subtree(GTK_TREE_ITEM(real_tree->tree_owner));
	}

      /* remove subtree associate at this item if it exist */      
      if(GTK_TREE_ITEM(widget)->subtree) 
	{
	  if (GTK_WIDGET_MAPPED (GTK_TREE_ITEM(widget)->subtree))
	    gtk_widget_unmap (GTK_TREE_ITEM(widget)->subtree);

	  gtk_widget_unparent (GTK_TREE_ITEM(widget)->subtree);
	  GTK_TREE_ITEM(widget)->subtree = NULL;
	}

      /* remove really widget for this item */
      if (GTK_WIDGET_MAPPED (widget))
	gtk_widget_unmap (widget);

      gtk_widget_unparent (widget);
    }

  if (selected_widgets)
    {
      tmp_list = selected_widgets;
      while (tmp_list)
	{
	  widget = tmp_list->data;
	  tmp_list = tmp_list->next;

	  gtk_tree_unselect_child (tree, widget);
	}
    }

  g_list_free (selected_widgets);

  if (root_tree->children && !root_tree->selection &&
      (root_tree->selection_mode == GTK_SELECTION_BROWSE))
    {
      widget = root_tree->children->data;
      gtk_tree_select_child (root_tree, widget);
    }

  if (GTK_WIDGET_VISIBLE (root_tree))
    gtk_widget_queue_resize (GTK_WIDGET (root_tree));
}
 
void
gtk_tree_select_child (GtkTree   *tree,
		       GtkWidget *child)
{

  gtk_signal_emit (GTK_OBJECT (tree), tree_signals[SELECT_CHILD], child);

}

void
gtk_tree_select_item (GtkTree   *tree,
		      gint     item)
{
  GList *tmp_list;


  g_return_if_fail (tree != NULL);
  g_return_if_fail (GTK_IS_TREE (tree));

  tmp_list = g_list_nth (tree->children, item);
  if (tmp_list)
    gtk_tree_select_child (tree, GTK_WIDGET (tmp_list->data));

}

static void
gtk_tree_size_allocate (GtkWidget     *widget,
			GtkAllocation *allocation)
{
  GtkTree *tree;
  GtkWidget *child, *subtree;
  GtkAllocation child_allocation;
  GList *children;


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

  tree = GTK_TREE (widget);

  widget->allocation = *allocation;
  if (GTK_WIDGET_REALIZED (widget))
    gdk_window_move_resize (widget->window,
			    allocation->x, allocation->y,
			    allocation->width, allocation->height);
  
  if (tree->children)
    {
      child_allocation.x = GTK_CONTAINER (tree)->border_width;
      child_allocation.y = GTK_CONTAINER (tree)->border_width;
      child_allocation.width = allocation->width - child_allocation.x * 2;

      children = tree->children;

      while (children)
	{
	  child = children->data;
	  children = children->next;

	  if (GTK_WIDGET_VISIBLE (child))
	    {
	      child_allocation.height = child->requisition.height;

	      gtk_widget_size_allocate (child, &child_allocation);

	      child_allocation.y += child_allocation.height;

	      if((subtree = GTK_TREE_ITEM(child)->subtree))
		if(GTK_WIDGET_VISIBLE (subtree))
		  {
		    child_allocation.height = subtree->requisition.height;
		    gtk_widget_size_allocate (subtree, &child_allocation);
		    child_allocation.y += child_allocation.height;
		  }
	    }
	}
    }

}

static void
gtk_tree_size_request (GtkWidget      *widget,
		       GtkRequisition *requisition)
{
  GtkTree *tree;
  GtkWidget *child, *subtree;
  GList *children;


  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_TREE (widget));
  g_return_if_fail (requisition != NULL);

  tree = GTK_TREE (widget);
  requisition->width = 0;
  requisition->height = 0;

  children = tree->children;
  while (children)
    {
      child = children->data;
      children = children->next;

      if (GTK_WIDGET_VISIBLE (child))
	{
	  gtk_widget_size_request (child, &child->requisition);

	  requisition->width = MAX (requisition->width, child->requisition.width);
	  requisition->height += child->requisition.height;

	  if((subtree = GTK_TREE_ITEM(child)->subtree) &&
	     GTK_WIDGET_VISIBLE (subtree))
	    {
	      gtk_widget_size_request (subtree, &subtree->requisition);

	      requisition->width = MAX (requisition->width, 
					subtree->requisition.width);

	      requisition->height += subtree->requisition.height;
	    }
	}
    }

  requisition->width += GTK_CONTAINER (tree)->border_width * 2;
  requisition->height += GTK_CONTAINER (tree)->border_width * 2;

  requisition->width = MAX (requisition->width, 1);
  requisition->height = MAX (requisition->height, 1);

}

static void
gtk_tree_unmap (GtkWidget *widget)
{

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

  GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);
  gdk_window_hide (widget->window);

}

void
gtk_tree_unselect_child (GtkTree   *tree,
			 GtkWidget *child)
{
  gtk_signal_emit (GTK_OBJECT (tree), tree_signals[UNSELECT_CHILD], child);
}

void
gtk_tree_unselect_item (GtkTree *tree,
			gint     item)
{
  GList *tmp_list;


  g_return_if_fail (tree != NULL);
  g_return_if_fail (GTK_IS_TREE (tree));

  tmp_list = g_list_nth (tree->children, item);
  if (tmp_list)
    gtk_tree_unselect_child (tree, GTK_WIDGET (tmp_list->data));

}

static void
gtk_real_tree_select_child (GtkTree   *tree,
			    GtkWidget *child)
{
  GList *selection, *root_selection;
  GList *tmp_list;
  GtkWidget *tmp_item;


  g_return_if_fail (tree != NULL);
  g_return_if_fail (GTK_IS_TREE (tree));
  g_return_if_fail (child != NULL);
  g_return_if_fail (GTK_IS_TREE_ITEM (child));

  root_selection = tree->root_tree->selection;
  
  switch (tree->root_tree->selection_mode)
    {
    case GTK_SELECTION_SINGLE:

      selection = root_selection;

      /* remove old selection list */
      while (selection)
	{
	  tmp_item = selection->data;

	  if (tmp_item != child)
	    {
	      gtk_tree_item_deselect (GTK_TREE_ITEM (tmp_item));

	      tmp_list = selection;
	      selection = selection->next;

	      root_selection = g_list_remove_link (root_selection, tmp_list);
	      gtk_widget_unref (tmp_item);
	      
	      g_list_free (tmp_list);
	    }
	  else
	    selection = selection->next;
	}

      if (child->state == GTK_STATE_NORMAL)
	{
	  gtk_tree_item_select (GTK_TREE_ITEM (child));
	  root_selection = g_list_prepend (root_selection, child);
	  gtk_widget_ref (child);
	}
      else if (child->state == GTK_STATE_SELECTED)
	{
	  gtk_tree_item_deselect (GTK_TREE_ITEM (child));
	  root_selection = g_list_remove (root_selection, child);
	  gtk_widget_unref (child);
	}

      tree->root_tree->selection = root_selection;

      gtk_signal_emit (GTK_OBJECT (tree->root_tree), 
		       tree_signals[SELECTION_CHANGED]);
      break;


    case GTK_SELECTION_BROWSE:
      selection = root_selection;

      while (selection)
	{
	  tmp_item = selection->data;

	  if (tmp_item != child)
	    {
	      gtk_tree_item_deselect (GTK_TREE_ITEM (tmp_item));

	      tmp_list = selection;
	      selection = selection->next;

	      root_selection = g_list_remove_link (root_selection, tmp_list);
	      gtk_widget_unref (tmp_item);

	      g_list_free (tmp_list);
	    }
	  else
	    selection = selection->next;
	}

      tree->root_tree->selection = root_selection;

      if (child->state == GTK_STATE_NORMAL)
	{
	  gtk_tree_item_select (GTK_TREE_ITEM (child));
	  root_selection = g_list_prepend (root_selection, child);
	  gtk_widget_ref (child);
	  tree->root_tree->selection = root_selection;
	  gtk_signal_emit (GTK_OBJECT (tree->root_tree), 
			   tree_signals[SELECTION_CHANGED]);
	}
      break;

    case GTK_SELECTION_MULTIPLE:
      if (child->state == GTK_STATE_NORMAL)
	{
	  gtk_tree_item_select (GTK_TREE_ITEM (child));
	  root_selection = g_list_prepend (root_selection, child);
	  gtk_widget_ref (child);
	  tree->root_tree->selection = root_selection;
	  gtk_signal_emit (GTK_OBJECT (tree->root_tree), 
			   tree_signals[SELECTION_CHANGED]);
	}
      else if (child->state == GTK_STATE_SELECTED)
	{
	  gtk_tree_item_deselect (GTK_TREE_ITEM (child));
	  root_selection = g_list_remove (root_selection, child);
	  gtk_widget_unref (child);
	  tree->root_tree->selection = root_selection;
	  gtk_signal_emit (GTK_OBJECT (tree->root_tree), 
			   tree_signals[SELECTION_CHANGED]);
	}
      break;

    case GTK_SELECTION_EXTENDED:
      break;
    }
}

static void
gtk_real_tree_unselect_child (GtkTree   *tree,
			      GtkWidget *child)
{

  g_return_if_fail (tree != NULL);
  g_return_if_fail (GTK_IS_TREE (tree));
  g_return_if_fail (child != NULL);
  g_return_if_fail (GTK_IS_TREE_ITEM (child));

  switch (tree->selection_mode)
    {
    case GTK_SELECTION_SINGLE:
    case GTK_SELECTION_MULTIPLE:
    case GTK_SELECTION_BROWSE:
      if (child->state == GTK_STATE_SELECTED)
	{
	  GtkTree* root_tree = GTK_TREE_ROOT_TREE(tree);
	  gtk_tree_item_deselect (GTK_TREE_ITEM (child));
	  root_tree->selection = g_list_remove (root_tree->selection, child);
	  gtk_widget_unref (child);
	  gtk_signal_emit (GTK_OBJECT (tree->root_tree), 
			   tree_signals[SELECTION_CHANGED]);
	}
      break;

    case GTK_SELECTION_EXTENDED:
      break;
    }
}

void
gtk_tree_set_selection_mode (GtkTree       *tree,
			     GtkSelectionMode mode) 
{
  g_return_if_fail (tree != NULL);
  g_return_if_fail (GTK_IS_TREE (tree));

  tree->selection_mode = mode;
}

void
gtk_tree_set_view_mode (GtkTree       *tree,
			GtkTreeViewMode mode) 
{
  g_return_if_fail (tree != NULL);
  g_return_if_fail (GTK_IS_TREE (tree));

  tree->view_mode = mode;
}

void
gtk_tree_set_view_lines (GtkTree       *tree,
			 guint          flag) 
{
  g_return_if_fail (tree != NULL);
  g_return_if_fail (GTK_IS_TREE (tree));

  tree->view_line = flag;
}