gtktree.c

gtk是linux一款强大的夸平台的图形化开发工具

/* 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-1999.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include "gtktree.h"
#include "gtktreeitem.h"
#include "gtkmain.h"
#include "gtksignal.h"
#include "gtklist.h"

enum {
  SELECTION_CHANGED,
  SELECT_CHILD,
  UNSELECT_CHILD,
  LAST_SIGNAL
};

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_forall          (GtkContainer   *container,
				      gboolean	      include_internals,
				      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 GtkType gtk_tree_child_type  (GtkContainer   *container);

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

GtkType
gtk_tree_get_type (void)
{
  static GtkType tree_type = 0;
  
  if (!tree_type)
    {
      static const GtkTypeInfo tree_info =
      {
	"GtkTree",
	sizeof (GtkTree),
	sizeof (GtkTreeClass),
	(GtkClassInitFunc) gtk_tree_class_init,
	(GtkObjectInitFunc) gtk_tree_init,
	/* reserved_1 */ NULL,
        /* reserved_2 */ NULL,
        (GtkClassInitFunc) 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_marshal_NONE__NONE,
		    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_marshal_NONE__POINTER,
		    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_marshal_NONE__POINTER,
		    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 = 
    (void (*)(GtkContainer *, GtkWidget *)) gtk_tree_remove_item;
  container_class->forall = gtk_tree_forall;
  container_class->child_type = gtk_tree_child_type;
  
  class->selection_changed = NULL;
  class->select_child = gtk_real_tree_select_child;
  class->unselect_child = gtk_real_tree_unselect_child;
}

static GtkType
gtk_tree_child_type (GtkContainer     *container)
{
  return GTK_TYPE_TREE_ITEM;
}

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 (void)
{
  return GTK_WIDGET (gtk_type_new (gtk_tree_get_type ()));
}

void
gtk_tree_append (GtkTree   *tree,
		 GtkWidget *tree_item)
{
  g_return_if_fail (tree != NULL);
  g_return_if_fail (GTK_IS_TREE (tree));
  g_return_if_fail (tree_item != NULL);
  g_return_if_fail (GTK_IS_TREE_ITEM (tree_item));
  
  gtk_tree_insert (tree, tree_item, -1);
}

void
gtk_tree_prepend (GtkTree   *tree,
		  GtkWidget *tree_item)
{
  g_return_if_fail (tree != NULL);
  g_return_if_fail (GTK_IS_TREE (tree));
  g_return_if_fail (tree_item != NULL);
  g_return_if_fail (GTK_IS_TREE_ITEM (tree_item));
  
  gtk_tree_insert (tree, tree_item, 0);
}

void
gtk_tree_insert (GtkTree   *tree,
		 GtkWidget *tree_item,
		 gint       position)
{
  gint nchildren;
  
  g_return_if_fail (tree != NULL);
  g_return_if_fail (GTK_IS_TREE (tree));
  g_return_if_fail (tree_item != NULL);
  g_return_if_fail (GTK_IS_TREE_ITEM (tree_item));
  
  nchildren = g_list_length (tree->children);
  
  if ((position < 0) || (position > nchildren))
    position = nchildren;
  
  if (position == nchildren)
    tree->children = g_list_append (tree->children, tree_item);
  else
    tree->children = g_list_insert (tree->children, tree_item, position);
  
  gtk_widget_set_parent (tree_item, GTK_WIDGET (tree));
  
  if (GTK_WIDGET_REALIZED (tree_item->parent))
    gtk_widget_realize (tree_item);

  if (GTK_WIDGET_VISIBLE (tree_item->parent) && GTK_WIDGET_VISIBLE (tree_item))
    {
      if (GTK_WIDGET_MAPPED (tree_item->parent))
	gtk_widget_map (tree_item);

      gtk_widget_queue_resize (tree_item);
    }
}

static void
gtk_tree_add (GtkContainer *container,
	      GtkWidget    *child)
{
  GtkTree *tree;
  
  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_TREE (container));
  g_return_if_fail (GTK_IS_TREE_ITEM (child));
  
  tree = GTK_TREE (container);
  
  tree->children = g_list_append (tree->children, child);
  
  gtk_widget_set_parent (child, GTK_WIDGET (container));
  
  if (GTK_WIDGET_REALIZED (child->parent))
    gtk_widget_realize (child);

  if (GTK_WIDGET_VISIBLE (child->parent) && GTK_WIDGET_VISIBLE (child))
    {
      if (GTK_WIDGET_MAPPED (child->parent))
	gtk_widget_map (child);

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

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 (item && !GTK_IS_TREE_ITEM (item))
    item = item->parent;
  
  if (!item || (item->parent != widget))
    return FALSE;
  
  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)
{
  GtkWidget *widget;
  GList *clear_list;
  GList *tmp_list;
  guint nchildren;
  guint index;
  
  g_return_if_fail (tree != NULL);
  g_return_if_fail (GTK_IS_TREE (tree));
  
  nchildren = g_list_length (tree->children);
  
  if (nchildren > 0)
    {
      if ((end < 0) || (end > nchildren))
	end = nchildren;
      
      if (start >= end)
	return;
      
      tmp_list = g_list_nth (tree->children, start);
      clear_list = NULL;
      index = start;
      while (tmp_list && index <= end)
	{
	  widget = tmp_list->data;
	  tmp_list = tmp_list->next;
	  index++;
	  
	  clear_list = g_list_prepend (clear_list, widget);
	}
      
      gtk_tree_remove_items (tree, clear_list);
    }
}

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