/* 
   NSOutlineView.h

   The outline class.
   
   Copyright (C) 2001 Free Software Foundation, Inc.

   Author:  Gregory John Casamento <greg_casamento@yahoo.com>
   Date: October 2001
   
   This file is part of the GNUstep GUI Library.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; see the file COPYING.LIB.
   If not, see <http://www.gnu.org/licenses/> or write to the 
   Free Software Foundation, 51 Franklin Street, Fifth Floor, 
   Boston, MA 02110-1301, USA.
*/ 

#ifndef _GNUstep_H_NSOutlineView
#define _GNUstep_H_NSOutlineView
#import <GNUstepBase/GSVersionMacros.h>

#import <AppKit/NSTableView.h>

@class NSMapTable;
@class NSMutableArray;
@class NSString;
@class NSURL;

@interface NSOutlineView : NSTableView
{
  NSMapTable *_itemDict;
  NSMutableArray *_items;
  NSMutableArray *_expandedItems;
  NSMutableArray *_selectedItems; /* No longer in use */
  NSMapTable *_levelOfItems;
  BOOL _autoResizesOutlineColumn;
  BOOL _indentationMarkerFollowsCell;
  BOOL _autosaveExpandedItems;
  CGFloat _indentationPerLevel;
  NSTableColumn *_outlineTableColumn;
}

// Instance methods
- (BOOL) autoResizesOutlineColumn;
- (BOOL) autosaveExpandedItems;
- (void) collapseItem: (id)item;
- (void) collapseItem: (id)item collapseChildren: (BOOL)collapseChildren;
- (void) expandItem: (id)item;
- (void) expandItem: (id)item expandChildren: (BOOL)expandChildren;
#if OS_API_VERSION(MAC_OS_X_VERSION_10_5, GS_API_LATEST)
- (NSRect) frameOfOutlineCellAtRow: (NSInteger)row;
#endif
- (BOOL) indentationMarkerFollowsCell;
- (CGFloat) indentationPerLevel;
- (BOOL) isExpandable: (id)item;
- (BOOL) isItemExpanded: (id)item;
- (id) itemAtRow: (NSInteger)row;
- (NSInteger) levelForItem: (id)item;
- (NSInteger) levelForRow: (NSInteger)row;
- (NSTableColumn *) outlineTableColumn;
#if OS_API_VERSION(MAC_OS_X_VERSION_10_5, GS_API_LATEST)
- (id) parentForItem: (id)item;
#endif
- (void) reloadItem: (id)item;
- (void) reloadItem: (id)item reloadChildren: (BOOL)reloadChildren;
- (NSInteger) rowForItem: (id)item;
- (void) setAutoresizesOutlineColumn: (BOOL)resize;
- (void) setAutosaveExpandedItems: (BOOL)flag;
- (void) setDropItem: (id)item dropChildIndex: (NSInteger)childIndex;
- (void) setIndentationMarkerFollowsCell: (BOOL)followsCell;
- (void) setIndentationPerLevel: (CGFloat)newIndentLevel;
- (void) setOutlineTableColumn: (NSTableColumn *)outlineTableColumn;
- (BOOL) shouldCollapseAutoExpandedItemsForDeposited: (BOOL)deposited;
@end /* interface of NSOutlineView */

/** 
 * Informal protocol NSOutlineViewDataSource 
 */
@interface NSObject (NSOutlineViewDataSource)
/**
 * Called to perform drop operation and returns YES if successful,
 * and NO otherwise.
 */
- (BOOL) outlineView: (NSOutlineView *)outlineView 
          acceptDrop: (id <NSDraggingInfo>)info 
                item: (id)item 
          childIndex: (NSInteger)index;
/**
 * Implementation of this method is required.  Returns the child at 
 * the specified index for the given item.
 */
- (id) outlineView: (NSOutlineView *)outlineView 
             child: (NSInteger)index 
            ofItem: (id)item;
/**
 * This is a required method.  Returns whether or not the outline view
 * item specified is expandable or not.
 */
- (BOOL) outlineView: (NSOutlineView *)outlineView
    isItemExpandable: (id)item;

/**
 * Returns the item for the given persistent object.
 */
- (id) outlineView: (NSOutlineView *)outlineView 
  itemForPersistentObject: (id)object;

/*
 * This is a required method.  Returns the number of children of
 * the given item.
 */
- (NSInteger) outlineView: (NSOutlineView *)outlineView
  numberOfChildrenOfItem: (id)item;

/**
 * This is a required method.  Returns the object corresponding to the
 * item representing it in the outline view.
 */
- (id) outlineView: (NSOutlineView *)outlineView 
  objectValueForTableColumn: (NSTableColumn *)tableColumn 
  byItem: (id)item;

/**
 * Returns the persistent object for the item specified.
 */
- (id) outlineView: (NSOutlineView *)outlineView
  persistentObjectForItem: (id)item;

/**
 * Sets the object value of the given item in the given table column
 * to the object provided.
 */
- (void) outlineView: (NSOutlineView *)outlineView 
      setObjectValue: (id)object
      forTableColumn: (NSTableColumn *)tableColumn
              byItem: (id)item;

/**
 * Used by the Drag and Drop system.  Returns the drag operation which should
 * be used when -outlineView:acceptDrop:item:childIndex: is called.
 */
- (NSDragOperation) outlineView: (NSOutlineView*)outlineView 
                   validateDrop: (id <NSDraggingInfo>)info 
                   proposedItem: (id)item 
             proposedChildIndex: (NSInteger)index;

/**
 * Causes the outline view to write the specified items to the pastboard.
 */
- (BOOL) outlineView: (NSOutlineView *)outlineView 
          writeItems: (NSArray*)items 
        toPasteboard: (NSPasteboard*)pboard;

#if OS_API_VERSION(MAC_OS_X_VERSION_10_3, GS_API_LATEST)
- (void) outlineView: (NSOutlineView *)outlineView
  sortDescriptorsDidChange: (NSArray *)oldSortDescriptors;
#endif

#if OS_API_VERSION(MAC_OS_X_VERSION_10_4, GS_API_LATEST)
- (NSArray *) outlineView: (NSOutlineView *)outlineView
namesOfPromisedFilesDroppedAtDestination: (NSURL *)dropDestination
          forDraggedItems: (NSArray *)items;
#endif
@end

/*
 * Constants
 */
enum {
  NSOutlineViewDropOnItemIndex = -1
};

/*
 * Notifications
 */
APPKIT_EXPORT NSString *NSOutlineViewColumnDidMoveNotification;
APPKIT_EXPORT NSString *NSOutlineViewColumnDidResizeNotification;
APPKIT_EXPORT NSString *NSOutlineViewSelectionDidChangeNotification;
APPKIT_EXPORT NSString *NSOutlineViewSelectionIsChangingNotification;
APPKIT_EXPORT NSString *NSOutlineViewItemDidExpandNotification;
APPKIT_EXPORT NSString *NSOutlineViewItemDidCollapseNotification;
APPKIT_EXPORT NSString *NSOutlineViewItemWillExpandNotification;
APPKIT_EXPORT NSString *NSOutlineViewItemWillCollapseNotification;

/*
 * Methods Implemented by the Delegate
 */
@interface NSObject (NSOutlineViewDelegate)
// notification methods
/**
 * Called after the column has moved.
 */
- (void) outlineViewColumnDidMove: (NSNotification *)aNotification;
/**
 * Called after the view column is resized.
 */
- (void) outlineViewColumnDidResize: (NSNotification *)aNotification;
/**
 * Called after the item has collapsed.
 */
- (void) outlineViewItemDidCollapse: (NSNotification *)aNotification;
/**
 * Called after the item has expanded
 */
- (void) outlineViewItemDidExpand: (NSNotification *)aNotification;
/**
 * Called before the item has collapsed.
 */
- (void) outlineViewItemWillCollapse: (NSNotification *)aNotification;
/**
 * Called before the item is expanded.
 */
- (void) outlineViewItemWillExpand: (NSNotification *)aNotification;
/**
 * Called when the selection has changed.
 */
- (void) outlineViewSelectionDidChange: (NSNotification *)aNotification;
/**
 * Called when the selection is about to change.
 */
- (void) outlineViewSelectionIsChanging: (NSNotification *)aNotification;

// delegate methods
/**
 * Returns whether or not the specified item should be allowed to collapse.
 */
- (BOOL)  outlineView: (NSOutlineView *)outlineView 
   shouldCollapseItem: (id)item;
/**
 * Returns whether or not the given table column should be allowed to be edited.
 */
- (BOOL)  outlineView: (NSOutlineView *)outlineView 
shouldEditTableColumn: (NSTableColumn *)tableColumn
	         item: (id)item;
/**
 * Returns whether or not the specified item should be expanded.
 */
- (BOOL)  outlineView: (NSOutlineView *)outlineView 
     shouldExpandItem: (id)item;
/**
 * Returns YES or NO depending on if the given item is selectable.  If YES, the item is selected,
 * otherwise the outline view will reject the selection.
 */
- (BOOL)  outlineView: (NSOutlineView *)outlineView 
     shouldSelectItem: (id)item;
/**
 * Returns YES or NO depending on if the given table column is selectable according
 * to the delegate.  If NO is returned the outline view will not allow the selection, if YES
 * it will allow the selection.
 */
- (BOOL)  outlineView: (NSOutlineView *)outlineView 
shouldSelectTableColumn: (NSTableColumn *)tableColumn;
/**
 * Called when the given cell is about to be displayed.  This method is
 * useful for making last second modifications to what will be shown. 
 */
- (void)  outlineView: (NSOutlineView *)outlineView 
      willDisplayCell: (id)cell
       forTableColumn: (NSTableColumn *)tableColumn
                 item: (id)item;  

#if OS_API_VERSION(MAC_OS_X_VERSION_10_5, GS_API_LATEST)
- (NSCell *) outlineView: (NSOutlineView *)outlineView 
  dataCellForTableColumn: (NSTableColumn *)aTableColumn
		    item: (id)item;
#endif

/**
 * Called when the given cell in the outline column is about to be displayed.  This method is
 * useful for making last second modifications to what will be shown.
 */
- (void)  outlineView: (NSOutlineView *)outlineView 
willDisplayOutlineCell: (id)cell
       forTableColumn: (NSTableColumn *)tableColumn
                 item: (id)item;
/**
 * Called before the selection is modified.  This method should return YES if
 * the selection is allowed and NO, if not.
 */
- (BOOL) selectionShouldChangeInOutlineView: (NSOutlineView *)outlineView;

#if OS_API_VERSION(MAC_OS_X_VERSION_10_3, GS_API_LATEST)
- (void) outlineView: (NSOutlineView *)outlineView
  didClickTableColumn: (NSTableColumn *)aTableColumn;
#endif

@end

#endif /* _GNUstep_H_NSOutlineView */