libs-gui/Source/NSText.m

/*
   NSText.m

   The RTFD text class

   Copyright (C) 1996 Free Software Foundation, Inc.

   Author:  Scott Christley <scottc@net-community.com>
   Date: 1996
   Author:  Felipe A. Rodriguez <far@ix.netcom.com>
   Date: July 1998
   Author:  Daniel B<EFBFBD>hringer <boehring@biomed.ruhr-uni-bochum.de>
   Date: August 1998
   Author: Fred Kiefer <FredKiefer@gmx.de>
   Date: March 2000
   Reorganised and cleaned up code, added some action methods

   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 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; see the file COPYING.LIB.
   If not, write to the Free Software Foundation,
   59 Temple Place - Suite 330, Boston, MA 02111 - 1307, USA.
*/

// toDo: - caret blinking
//	 - formatting routine: broader than 1.5x width cause display problems
//	 - optimization: 1.deletion of single char in paragraph [opti hook 1]
//	 - optimization: 2.newline in first line
//	 - optimization: 3.paragraph made one less line due to delition
//                         of single char [opti hook 1; diff from 1.]

#include <gnustep/gui/config.h>
#include <Foundation/NSNotification.h>
#include <Foundation/NSString.h>

#include <AppKit/NSFileWrapper.h>
#include <AppKit/NSControl.h>
#include <AppKit/NSText.h>
#include <AppKit/NSApplication.h>
#include <AppKit/NSWindow.h>
#include <AppKit/NSFontManager.h>
#include <AppKit/NSFont.h>
#include <AppKit/NSColor.h>
#include <AppKit/NSParagraphStyle.h>
#include <AppKit/NSPasteboard.h>
#include <AppKit/NSSpellChecker.h>

#include <AppKit/NSDragging.h>
#include <AppKit/NSStringDrawing.h>
#include <AppKit/NSTextStorage.h>
#include <AppKit/NSTextContainer.h>

#include <Foundation/NSNotification.h>
#include <Foundation/NSArchiver.h>
#include <Foundation/NSValue.h>
#include <Foundation/NSScanner.h>
#include <Foundation/NSData.h>

#define HUGE 1e99

static NSCharacterSet *selectionWordGranularitySet;
static NSCharacterSet *selectionParagraphGranularitySet;
static NSCharacterSet *invSelectionWordGranularitySet;
static NSCharacterSet *invSelectionParagraphGranularitySet;

@interface _GNULineLayoutInfo: NSObject
{
@public
  NSRange	lineRange;
  NSRect	lineRect;
  unsigned	type;
}

typedef enum
{
  // do not use 0 in order to secure calls to nil (calls to nil return 0)!
  LineLayoutInfoType_Text = 1,
  LineLayoutInfoType_Paragraph = 2
} _GNULineLayoutInfo_t;

+ (id) lineLayoutWithRange: (NSRange)aRange
		      rect: (NSRect)aRect
		      type: (unsigned)aType;

- (NSRange) lineRange;
- (NSRect) lineRect;
- (unsigned) type;

- (void) setLineRange: (NSRange)aRange;
- (void) setLineRect: (NSRect)aRect;
- (void) setType: (unsigned)aType;

- (NSString*) description;
@end

@implementation _GNULineLayoutInfo

+ (_GNULineLayoutInfo *) lineLayoutWithRange: (NSRange)aRange
		      rect: (NSRect)aRect
		      type: (unsigned)aType
{
  _GNULineLayoutInfo *ret = AUTORELEASE([_GNULineLayoutInfo new]);

  ret->lineRange = aRange;
  ret->lineRect =aRect;
  ret->type = aType;
  return ret;
}

- (unsigned) type
{
  return type;
}

- (NSRange) lineRange
{
  return lineRange;
}

- (NSRect) lineRect
{
  return lineRect;
}

- (void) setLineRange: (NSRange)aRange
{
  lineRange = aRange;
}

- (void) setLineRect: (NSRect)aRect
{
  lineRect = aRect;
}

- (void) setType: (unsigned)aType
{
  type = aType;
}

- (NSString*) description
{
  return [[NSDictionary dictionaryWithObjectsAndKeys:
			  NSStringFromRange(lineRange), @"LineRange",
			  NSStringFromRect(lineRect), @"LineRect",
			  nil]
	   description];
}

@end

static NSRange MakeRangeFromAbs (int a1,int a2) // not the same as NSMakeRange!
{
  if (a1 < 0)
    a1  = 0;
  if (a2 < 0)
    a2  = 0;
  if (a1 < a2)
    return NSMakeRange (a1, a2 - a1);
  else
    return NSMakeRange (a2, a1 - a2);
}

// end: _GNULineLayoutInfo------------------------------------------------------

@interface _GNUSeekableArrayEnumerator: NSObject
{
  unsigned	currentIndex;
  NSArray	*array;
}
- (id) initWithArray: (NSArray*)anArray;
- (id) nextObject;
- (id) previousObject;
- (id) currentObject;
@end

@implementation _GNUSeekableArrayEnumerator

- (id) initWithArray: (NSArray*)anArray
{
  self = [super init];
  array = RETAIN(anArray);
  return self;
}

- (id) nextObject
{
  if (currentIndex >= [array count])
    return nil;
  return [array objectAtIndex: currentIndex++];
}

- (id) previousObject
{
  if (currentIndex == 0)
    return nil;
  return [array objectAtIndex: --currentIndex];
}

- (id) currentObject
{
  return [array objectAtIndex: currentIndex];
}

- (void) dealloc
{
  RELEASE(array);
  [super dealloc];
}
@end

@interface NSArray(SeekableEnumerator)
- (_GNUSeekableArrayEnumerator*) seekableEnumerator;
@end
@implementation NSArray(SeekableEnumerator)
- (_GNUSeekableArrayEnumerator*) seekableEnumerator
{
  return AUTORELEASE([[_GNUSeekableArrayEnumerator alloc] initWithArray: self]);
}
@end



@interface NSText(GNUstepPrivate)
/*
 * these NSLayoutManager- like methods are here only informally (GNU extensions)
 */
- (unsigned) characterIndexForPoint: (NSPoint)point;
- (NSRect) rectForCharacterIndex: (unsigned)index;
- (NSRect) rectForCharacterRange: (NSRange)aRange;
- (void) _buildUpLayout;
- (NSRect) _textBounds;

/*
 * various GNU extensions
 */
+ (void) setSelectionWordGranularitySet: (NSCharacterSet*)aSet;
+ (void) setSelectionParagraphGranularitySet: (NSCharacterSet*)aSet;

+ (NSDictionary*) defaultTypingAttributes;

//
// GNU utility methods
//
- (void) setAttributes: (NSDictionary*) attributes range: (NSRange) aRange;
- (void) _illegalMovement: (int) notNumber;
- (void) deleteRange: (NSRange)aRange backspace: (BOOL)flag;

- (void) drawInsertionPointAtIndex: (unsigned)index
			     color: (NSColor*)color
			  turnedOn: (BOOL)flag;
- (void) drawSelectionAsRangeNoCaret: (NSRange)aRange;

@end


@interface GSSimpleLayoutManager: NSObject
{
  // contains private _GNULineLayoutInfo objects
  NSMutableArray	*lineLayoutInformation;
  NSText		*_textHolder;
  NSTextStorage	*_textStorage;
}

- (id) initForText: (NSText*) aTextHolder;
- (NSTextStorage*) textStorage;
- (void) setTextStorage: (NSTextStorage*) aTextStorage;
- (void)textStorage:(NSTextStorage *)aTextStorage
	     edited:(unsigned int)mask
	      range:(NSRange)range
     changeInLength:(int)lengthChange
   invalidatedRange:(NSRange)invalidatedCharRange;
/*
- (NSRect *) rectArrayForCharacterRange: (NSRange)charRange 
	   withinSelectedCharacterRange: (NSRange)selCharRange
			inTextContainer: (NSTextContainer *)aTextContainer 
			      rectCount: (unsigned int *)rectCount;
*/

- (NSSize) _sizeOfRange: (NSRange) range;
- (NSRect) _textBounds;

- (unsigned) characterIndexForPoint: (NSPoint)point;
- (NSRect) rectForCharacterIndex: (unsigned) index;
- (NSRect) rectForCharacterRange: (NSRange) aRange;
- (NSRange) characterRangeForBoundingRect: (NSRect)bounds;
- (NSRange) lineRangeForRect: (NSRect) aRect;

// return value is identical to the real line number
// (plus counted newline characters)
- (int) lineLayoutIndexForCharacterIndex: (unsigned) anIndex;
// returns the full character range for a line range
- (NSRange) characterRangeForLineLayoutRange: (NSRange) aRange;

- (void) setNeedsDisplayForLineRange: (NSRange) redrawLineRange;
// override for special layout of text
- (NSRange) rebuildForRange: (NSRange)aRange
		  delta: (int)insertionDelta;
// low level, override but never invoke (use setNeedsDisplayForLineRange:)
- (void) drawLinesInLineRange: (NSRange)aRange;
- (NSRange) drawRectCharacters: (NSRect)rect;
@end

@implementation GSSimpleLayoutManager
- (id) initForText: (NSText*)aTextHolder
{
  _textHolder = aTextHolder;
  return self;
}

- (void) setTextStorage: (NSTextStorage*)aTextStorage
{
  unsigned length = [aTextStorage length];
  NSRange aRange = NSMakeRange(0, length);
  ASSIGN(_textStorage, aTextStorage);
  // force complete re - layout
  RELEASE(lineLayoutInformation);
  lineLayoutInformation = nil;
  [self textStorage: aTextStorage
	edited: NSTextStorageEditedCharacters | NSTextStorageEditedAttributes
	range: aRange
	changeInLength: length 
	invalidatedRange: aRange];
}

- (NSTextStorage*) textStorage
{
  return _textStorage;
}

- (NSSize) _sizeOfRange: (NSRange)aRange
{
  if (!aRange.length || _textStorage == nil ||
      NSMaxRange(aRange) > [_textStorage length])
    return NSZeroSize;

  return [[_textStorage attributedSubstringFromRange: aRange] size];
}

// Returns the currently used bounds for all the text
- (NSRect) _textBounds
{
  if ([lineLayoutInformation count])
    {
      NSEnumerator *lineEnum;
      _GNULineLayoutInfo *currentInfo;
      NSRect retRect = NSMakeRect (0, 0, 0, 0);

      for ((lineEnum = [lineLayoutInformation objectEnumerator]);
	   (currentInfo = [lineEnum nextObject]);)
	{
	  retRect = NSUnionRect (retRect, [currentInfo lineRect]);
	}
      return retRect;
    }
  else
    return NSZeroRect;
}

- (NSRect) frame
{
  NSRect aRect = [_textHolder frame];

  if ([_textHolder isHorizontallyResizable])
    aRect.size.width = HUGE;
  if ([_textHolder isVerticallyResizable])
    aRect.size.height = HUGE;

  return aRect;
}

- (NSRange) characterRangeForLineLayoutRange: (NSRange)aRange;
{
  _GNULineLayoutInfo	*currentInfo;
  unsigned startLine = aRange.location;
  unsigned endLine = NSMaxRange(aRange);
  unsigned startIndex;
  unsigned endIndex;

  if (startLine >= [lineLayoutInformation count])
    currentInfo = [lineLayoutInformation lastObject];
  else
    currentInfo = [lineLayoutInformation objectAtIndex: startLine];
  startIndex = [currentInfo lineRange].location;

  if (endLine >= [lineLayoutInformation count])
    currentInfo = [lineLayoutInformation lastObject];
  else
    currentInfo = [lineLayoutInformation objectAtIndex: endLine];
  endIndex = NSMaxRange([currentInfo lineRange]);

  return NSMakeRange(startIndex, endIndex - startIndex);
}

- (NSRange) characterRangeForBoundingRect: (NSRect)boundsRect
{
  NSRange lineRange = [self lineRangeForRect: boundsRect];

  if (lineRange.length)
    return [self characterRangeForLineLayoutRange: lineRange];
  else
    return NSMakeRange (0, 0);
}

- (unsigned) lineLayoutIndexForPoint: (NSPoint)point
{
  int i;
  int min = 0;
  int max = MAX(0, [lineLayoutInformation count] - 1);
  float y = point.y;
  float fmin = NSMinY([[lineLayoutInformation objectAtIndex: 0] lineRect]);
  float fmax = NSMaxY([[lineLayoutInformation lastObject] lineRect]);
  NSRect rect;

  if (y >= fmax)
    return max;

  if (y <= fmin)
    return min;

  // this should give a good starting index for binary search
  i = (int)((max - min) * (y - fmin) / (fmax - fmin)) + min;
  while (min < max)
    {
      _GNULineLayoutInfo *ci = [lineLayoutInformation objectAtIndex: i];

      rect = [ci lineRect];

      if (NSMaxY(rect) < y)
	{
	  min = i + 1;
	  i = (max + min) / 2;
	  continue;
	}
      if (NSMinY(rect) > y)
	{
	  max = i - 1;
	  i = (max + min) / 2;
	  continue;
	}

      // As the newline char generates its own lineLayoutinfo box
      // there may be two in one line, we have to check for this
      if ((NSMinX(rect) > point.x)  && (i > 0) &&
	  ([ci type] == LineLayoutInfoType_Paragraph))
	{
	  _GNULineLayoutInfo *bi = [lineLayoutInformation objectAtIndex: i - 1];
	  rect = [bi lineRect];
	  if (NSPointInRect(point, rect))
	    return i - 1;
	}
      if ((NSMaxX(rect) < point.x) && (i < [lineLayoutInformation count] - 1) &&
	  ([ci type] == LineLayoutInfoType_Text))
	{
	  _GNULineLayoutInfo *bi = [lineLayoutInformation objectAtIndex: i + 1];
	  rect = [bi lineRect];
	  if (NSPointInRect(point, rect))
	    return i + 1;
	}
 
      return i;
    }
  return min;
}

- (unsigned) characterIndexForPoint: (NSPoint)point
{
  _GNULineLayoutInfo *currentInfo = [lineLayoutInformation 
				      objectAtIndex: 
					[self lineLayoutIndexForPoint: point]];
  NSRect rect = [currentInfo lineRect];
  NSRange range = [currentInfo lineRange];
  int i;
  int min = range.location;
  int max = NSMaxRange(range);
  float x = point.x;
  float fmin = rect.origin.x;
  float fmax = NSMaxX(rect);
  float w1, w2;

  if (x <= fmin)
    return MAX(0, min - 1);
  if (x >= fmax)
    return MAX(0, max - 1);
  if (range.length == 1)
    return min;

  // this should give a good starting index for binary search
  i = (int)((max - min) * (x - fmin) / (fmax - fmin)) + min;
  while (min < max)
    {
      w1 = [self _sizeOfRange:
		  NSMakeRange (range.location,
			       i - range.location)].width + fmin;
      if (i > range.location)
	w2 = [self _sizeOfRange:
		     NSMakeRange (range.location,
				  i-1 - range.location)].width + fmin;
      else
	w2 = fmin;

      if (w1 < x)
	{
	  min = i + 1;
	  i = (max + min) / 2;
	  continue;
	}
      if (w2 > x)
	{
	  max = i - 1;
	  i = (max + min) / 2;
	  continue;
	}
      return MAX(0, i-1);
    }
  return MAX(0, min - 1);
}

- (int) lineLayoutIndexForCharacterIndex: (unsigned)anIndex
{
  int i;
  int min = 0;
  int max = MAX(0, [lineLayoutInformation count] - 1);
  unsigned y = anIndex;
  unsigned fmin = [[lineLayoutInformation objectAtIndex: 0] lineRange].location;
  unsigned fmax = NSMaxRange([[lineLayoutInformation lastObject] lineRange]);
  NSRange range;

  if (y >= fmax)
    return max;

  if (y <= fmin)
    return min;

  // this should give a good starting index for binary search
  i = (int)((max - min) * (y - fmin) / (fmax - fmin)) + min;
  while (min < max)
    {
      _GNULineLayoutInfo *ci = [lineLayoutInformation objectAtIndex: i];

      range = [ci lineRange];

      if (NSMaxRange(range) <= y)
	{
	  min = i + 1;
	  i = (max + min) / 2;
	  continue;
	}
      if (range.location > y)
	{
	  max = i - 1;
	  i = (max + min) / 2;
	  continue;
	}
      // Do we need a special treatment for paragraph infos?
      return i;
    }
  return min;
}

// rect to the end of line
- (NSRect) rectForCharacterIndex: (unsigned)index
{
  float maxWidth = [self frame].size.width;
  _GNULineLayoutInfo *currentInfo;
  unsigned start;
  NSRect rect;
  float x;

  if (![_textStorage length])
    {
      return NSMakeRect (0, 0, maxWidth,
			 [self _sizeOfRange: NSMakeRange(0,1)].height);
    }

  if (index >= NSMaxRange([[lineLayoutInformation lastObject] lineRange]))
    {
      NSRect rect = [[lineLayoutInformation lastObject] lineRect];
      if (NSMaxX (rect) >= maxWidth)
	{
	  return NSMakeRect (0, NSMaxY(rect),
			     maxWidth, rect.size.height);
	}
      return NSMakeRect (NSMaxX (rect), rect.origin.y,
			 maxWidth - NSMaxX (rect),
			 rect.size.height);
    }


 currentInfo = [lineLayoutInformation 
		   objectAtIndex: [self lineLayoutIndexForCharacterIndex: 
					    index]];
 start = [currentInfo lineRange].location;
 rect = [currentInfo lineRect];
 x = rect.origin.x + [self _sizeOfRange: MakeRangeFromAbs(start, 
							  index)].width;
     
 return NSMakeRect (x, rect.origin.y, NSMaxX (rect) - x,
		    rect.size.height);
}

- (NSRect) rectForCharacterRange: (NSRange)aRange
{
  float maxWidth = [self frame].size.width;
  _GNULineLayoutInfo *currentInfo;
  unsigned i1, i2;
  NSRect rect1, rect2;

  if (![_textStorage length])
    {
      return NSMakeRect (0, 0, maxWidth,
			 [self _sizeOfRange: NSMakeRange(0,1)].height);
    }

  i1 = [self lineLayoutIndexForCharacterIndex: aRange.location];
  i2 = [self lineLayoutIndexForCharacterIndex: NSMaxRange(aRange)];

  // This is not exacty what we need, but should be correct enought
  currentInfo = [lineLayoutInformation 
		    objectAtIndex: i1];
  rect1 = [currentInfo lineRect];

  if (i1 == i2)
    {
      return rect1;
    }

  currentInfo = [lineLayoutInformation 
		    objectAtIndex: i2];
  rect2 = [currentInfo lineRect];
  return NSUnionRect(rect1, rect2);
}

- (void) setNeedsDisplayForLineRange: (NSRange)redrawLineRange
{
  NSRect myFrame = [self frame];
  float maxWidth = myFrame.size.width;

  if ([lineLayoutInformation count]
      && redrawLineRange.location < [lineLayoutInformation count]
      && redrawLineRange.length)
    {
      _GNULineLayoutInfo *firstInfo
	= [lineLayoutInformation objectAtIndex: redrawLineRange.location];
      NSRect displayRect, firstRect = [firstInfo lineRect];

      if ([firstInfo type]  == LineLayoutInfoType_Paragraph
	  && firstRect.origin.x >0 && redrawLineRange.location)
      {
	redrawLineRange.location--;
	redrawLineRange.length++;
      }

      displayRect
	= NSUnionRect ([[lineLayoutInformation
			  objectAtIndex: redrawLineRange.location]
			 lineRect],
		       [[lineLayoutInformation
			  objectAtIndex:
			    MAX (0, (int)NSMaxRange (redrawLineRange) - 1)]
			 lineRect]);

      displayRect.size.width = maxWidth - displayRect.origin.x;
      [_textHolder setNeedsDisplayInRect: displayRect];
    }


  // clean up the remaining area below the text
    {
      float lowestY = 0;

      if ([lineLayoutInformation count])
	lowestY = NSMaxY ([[lineLayoutInformation lastObject] lineRect]);

      if (![lineLayoutInformation count]
	  || (lowestY < NSMaxY(myFrame)))
	{
	  [_textHolder setNeedsDisplayInRect: NSMakeRect(0, lowestY,
						  myFrame.size.width,
						  NSMaxY (myFrame) - lowestY)];
	}
    }
}

- (void)textStorage:(NSTextStorage *)aTextStorage
	     edited:(unsigned int)mask
	      range:(NSRange)aRange
     changeInLength:(int)delta
   invalidatedRange:(NSRange)invalidatedCharRange;
{
  NSRange lineRange;

  // No editing
  if (!mask)
    return;

  lineRange = [self rebuildForRange: aRange
		delta: delta];
  [self setNeedsDisplayForLineRange: lineRange];
}

// internal method <!> range is currently not passed as absolute
- (void) addNewlines: (NSRange)aRange
     intoLayoutArray: (NSMutableArray*)anArray
	     atPoint: (NSPoint*)aPointP
	       width: (float)width
      characterIndex: (unsigned)startingLineCharIndex
     ghostEnumerator: (_GNUSeekableArrayEnumerator*)prevArrayEnum
	    didShift: (BOOL*)didShift
verticalDisplacement: (float*)verticalDisplacement
{
  NSSize advanceSize = [self _sizeOfRange:
			       NSMakeRange (startingLineCharIndex, 1)];
  int count = aRange.length;
  int charIndex;
  _GNULineLayoutInfo *ghostInfo = nil;

  (*didShift) = NO;

  for (charIndex = aRange.location; --count >= 0; charIndex++)
    {
      [anArray addObject:
		 [_GNULineLayoutInfo
		   lineLayoutWithRange:
		     NSMakeRange (startingLineCharIndex, 1)
		   rect: NSMakeRect (aPointP->x, aPointP->y,
				     width - aPointP->x, advanceSize.height)
		   type: LineLayoutInfoType_Paragraph]];

      startingLineCharIndex++;
      aPointP->x = 0;
      aPointP->y += advanceSize.height;

      if (prevArrayEnum && !(ghostInfo = [prevArrayEnum nextObject]))
	prevArrayEnum = nil;

      if (ghostInfo && ([ghostInfo type] != LineLayoutInfoType_Paragraph))
	{
	  _GNULineLayoutInfo *prevInfo = [prevArrayEnum previousObject];
	  prevArrayEnum = nil;
	  (*didShift) = YES;
	  (*verticalDisplacement) += aPointP ->y - [prevInfo lineRect].origin.y;
	}
    }
}

// private helper function
- (unsigned) _relocLayoutArray: (NSArray*)ghostArray
			atLine: (int) aLine
			offset: (int) relocOffset
		     lineTrift: (int) rebuildLineDrift
		    floatTrift: (float) yReloc
{
  // lines actually updated (optimized drawing)
  unsigned ret = [lineLayoutInformation count] - aLine;
  NSArray *relocArray
    = [ghostArray subarrayWithRange:
		    MakeRangeFromAbs (MAX (0, ret + rebuildLineDrift),
				      [ghostArray count])];
  NSEnumerator *relocEnum;
  _GNULineLayoutInfo *currReloc;

  if (![relocArray count])
    return ret;

  for ((relocEnum = [relocArray objectEnumerator]);
       (currReloc = [relocEnum nextObject]);)
    {
      NSRange range = [currReloc lineRange];
      [currReloc setLineRange: NSMakeRange (range.location + relocOffset,
					    range.length)];
      if (yReloc)
	{
	  NSRect rect = [currReloc lineRect];
	  [currReloc setLineRect: NSMakeRect (rect.origin.x,
					      rect.origin.y + yReloc,
					      rect.size.width,
					      rect.size.height)];
	}
    }
  [lineLayoutInformation addObjectsFromArray: relocArray];
  return ret;
}

/*
 * A little utility function to determine the range of characters in a scanner
 * that are present in a specified character set.
 */
static inline NSRange
scanRange(NSScanner *scanner, NSCharacterSet* aSet)
{
  unsigned	start = [scanner scanLocation];
  unsigned	end = start;

  if ([scanner scanCharactersFromSet: aSet intoString: 0] == YES)
    {
      end = [scanner scanLocation];
    }
  return NSMakeRange(start, end - start);
}

// begin: central line formatting method---------------------------------------
// returns count of lines actually updated
// <!> detachNewThreadSelector: selector toTarget: target withObject: argument;

- (NSRange) rebuildForRange: (NSRange)aRange
		  delta: (int)insertionDelta
{
  int aLine = 0;
  int insertionLineIndex = 0;
  //unsigned oldMax = NSMaxRange(aRange);
  //unsigned newMax = oldMax + insertionDelta;
  NSPoint drawingPoint = NSZeroPoint;
  NSScanner *pScanner;
  float	width = [self frame].size.width;
  unsigned startingIndex = 0;
  unsigned currentLineIndex;
  // for optimization detection
  NSArray *ghostArray;
  _GNUSeekableArrayEnumerator *prevArrayEnum;
  NSString *parsedString;
  int lineDriftOffset = 0, rebuildLineDrift = 0;
  BOOL frameshiftCorrection = NO, nlDidShift = NO;
  float	yDisplacement = 0;

  // sanity check that it is possible to do the layout
  if (width == 0.0)
    {
      NSLog(@"NSText formatting with empty frame");
      return NSMakeRange(0,0);
    }

  if (lineLayoutInformation == nil)
    {
      lineLayoutInformation = [[NSMutableArray alloc] init];
      aLine = 0;
      ghostArray = nil;
      prevArrayEnum = nil;
    }
  else
    {
      insertionLineIndex = [self lineLayoutIndexForCharacterIndex: 
				     aRange.location];
      aLine = MAX(0, insertionLineIndex - 1);

      // remember old array for optimization purposes
      ghostArray = [lineLayoutInformation
		     subarrayWithRange:
		       NSMakeRange (aLine, [lineLayoutInformation count] - aLine)];
      // every time an object is added to lineLayoutInformation
      // a nextObject has to be performed on prevArrayEnum!
      prevArrayEnum = [ghostArray seekableEnumerator];

      if (aLine)
	{
	  _GNULineLayoutInfo *lastValidLineInfo = [lineLayoutInformation 
						      objectAtIndex: aLine - 1];
	  NSRect aRect = [lastValidLineInfo lineRect];

	  startingIndex = NSMaxRange([lastValidLineInfo lineRange]);
	  drawingPoint = aRect.origin;
	  drawingPoint.y += aRect.size.height;
	  if ([lastValidLineInfo type] == LineLayoutInfoType_Paragraph)
	    {
	      drawingPoint.x = 0;
	    }

	  // keep paragraph - terminating space on same line as paragraph
	  if ((((int)[lineLayoutInformation count]) - 1) >= aLine)
	    {
	      _GNULineLayoutInfo *anchorLine
		= [lineLayoutInformation objectAtIndex: aLine];
	      NSRect anchorRect = [anchorLine lineRect];

	      if (anchorRect.origin.x > drawingPoint.x
		  && aRect.origin.y == anchorRect.origin.y)
		{
		  drawingPoint = anchorRect.origin;
		}
	    }
	}

      [lineLayoutInformation
	removeObjectsInRange:
	  NSMakeRange (aLine, [lineLayoutInformation count] - aLine)];
    }

  if (![_textStorage length])
    {
	// If there is no text add one empty box
	[lineLayoutInformation
	    addObject: [_GNULineLayoutInfo
			   lineLayoutWithRange: NSMakeRange (0, 0)
			   rect: NSMakeRect (0, 0, 0, 0)
			   type: LineLayoutInfoType_Text]];
	return NSMakeRange(0,0);
    }
      

  currentLineIndex = aLine;

  // each paragraph
  parsedString = [[_textStorage string] substringFromIndex: startingIndex];
  pScanner = [NSScanner scannerWithString: parsedString];
  [pScanner setCharactersToBeSkipped: nil];
  while ([pScanner isAtEnd] == NO)
    {
      NSScanner	*lScanner;
      NSString	*paragraph;
      NSRange	paragraphRange, leadingNlRange, trailingNlRange;
      unsigned	currentLoc = [pScanner scanLocation];
      unsigned	startingParagraphIndex = currentLoc + startingIndex;
      unsigned	startingLineCharIndex = startingParagraphIndex;
      BOOL	isBuckled = NO, inBuckling = NO;

      leadingNlRange
	= scanRange(pScanner, selectionParagraphGranularitySet);
      if (leadingNlRange.length > 0)
	{
	  [self addNewlines: leadingNlRange
	    intoLayoutArray: lineLayoutInformation
		    atPoint: &drawingPoint
		      width: width
	     characterIndex: startingLineCharIndex
	    ghostEnumerator: prevArrayEnum
		   didShift: &nlDidShift
       verticalDisplacement: &yDisplacement];

	  if (nlDidShift)
	    {
	      if (insertionDelta  == 1)
		{
		  frameshiftCorrection = YES;
		  rebuildLineDrift--;
		}
	      else if (insertionDelta  == - 1)
		{
		  frameshiftCorrection = YES;
		  rebuildLineDrift++;
		}
	      else nlDidShift = NO;
	    }

	  startingLineCharIndex += leadingNlRange.length;
	  currentLineIndex += leadingNlRange.length;
	}

      // each line
      paragraphRange
	= scanRange(pScanner, invSelectionParagraphGranularitySet);
      paragraph = [parsedString substringWithRange: paragraphRange];
      lScanner = [NSScanner scannerWithString: paragraph];
      [lScanner setCharactersToBeSkipped: nil];
      while ([lScanner isAtEnd] == NO)
	{
	  NSRect	currentLineRect = NSMakeRect (0, drawingPoint.y, 0, 0);
	  // starts with zero, do not confuse with startingLineCharIndex
	  unsigned	localLineStartIndex = [lScanner scanLocation];
	  NSSize	advanceSize = NSZeroSize;

	  // scan the individual words to the end of the line
	  for (; ![lScanner isAtEnd]; drawingPoint.x += advanceSize.width)
	    {
	      NSRange	currentStringRange, trailingSpacesRange;
	      NSRange	leadingSpacesRange;
	      unsigned	scannerPosition = [lScanner scanLocation];

	      // snack next word

	      // leading spaces: only first time
	      leadingSpacesRange
		= scanRange(lScanner, selectionWordGranularitySet);
	      currentStringRange
		= scanRange(lScanner, invSelectionWordGranularitySet);
	      trailingSpacesRange
		= scanRange(lScanner, selectionWordGranularitySet);

	      if (leadingSpacesRange.length)
		currentStringRange = NSUnionRange(leadingSpacesRange,
						   currentStringRange);
	      if (trailingSpacesRange.length)
		currentStringRange = NSUnionRange(trailingSpacesRange,
						   currentStringRange);

	      // evaluate size of current word and line so far
	      advanceSize = [self _sizeOfRange:
				    NSMakeRange (currentStringRange.location +
						 paragraphRange.location +
						 startingIndex,
						 currentStringRange.length)];

	      currentLineRect = NSUnionRect (currentLineRect,
					     NSMakeRect (drawingPoint.x,
							 drawingPoint.y,
							 advanceSize.width,
							 advanceSize.height));

	      // handle case where single word is broader than width
	      // (buckle word) <!> unfinished and untested
	      // for richText (absolute position see above)
	      if (advanceSize.width > width)
		{
		  if (isBuckled)
		    {
		      NSSize currentSize = NSMakeSize (HUGE, 0);
		      unsigned lastVisibleCharIndex;

		      for (lastVisibleCharIndex
			     = startingLineCharIndex + currentStringRange.length;
			   currentSize.width>= width
			     && lastVisibleCharIndex> startingLineCharIndex;
			   lastVisibleCharIndex--)
			{
			  currentSize = [self _sizeOfRange:
						MakeRangeFromAbs (startingLineCharIndex,
								  lastVisibleCharIndex)];
			}
		      isBuckled = NO;
		      inBuckling = YES;
		      scannerPosition
			= localLineStartIndex
			+ (lastVisibleCharIndex - startingLineCharIndex)+1;
		      currentLineRect.size.width = advanceSize.width = width;
		    }
		  else
		    {
		      // undo layout of extralarge word
		      // (will be done the next line [see above])
		      isBuckled = YES;
		      currentLineRect.size.width -= advanceSize.width;
		    }
		}

	      // end of line -> word wrap

	      // >= : wichtig f<EFBFBD>r abknicken (isBuckled)
	      if (currentLineRect.size.width >= width || isBuckled)
	        {
		_GNULineLayoutInfo *ghostInfo = nil, *thisInfo;

		// undo layout of last word
		[lScanner setScanLocation: scannerPosition];

		currentLineRect.origin.x = 0;
		currentLineRect.origin.y = drawingPoint.y;
		drawingPoint.y += currentLineRect.size.height;
		drawingPoint.x = 0;

		[lineLayoutInformation
		  addObject: (thisInfo
			      = [_GNULineLayoutInfo
				  lineLayoutWithRange:
				    NSMakeRange (startingLineCharIndex,
						 scannerPosition - localLineStartIndex)
				  rect: currentLineRect
				  type: LineLayoutInfoType_Text])];

		currentLineIndex++;
		startingLineCharIndex = NSMaxRange([thisInfo lineRange]);

		if (prevArrayEnum
		    && !(ghostInfo = [prevArrayEnum nextObject]))
		  prevArrayEnum = nil;

		// optimization stuff
		// (do relayout only as much lines as necessary
		// and patch the rest)---------
		if (ghostInfo)
		  {
		    if ([ghostInfo type] != [thisInfo type])
		      {
			// frameshift correction
			frameshiftCorrection = YES;
			if (insertionDelta  == - 1)
			  {
			    // deletition of newline
			    _GNULineLayoutInfo *nextObject;
			    if (!(nextObject = [prevArrayEnum nextObject]))
			      prevArrayEnum = nil;
			    else
			      {
				if (nlDidShift && frameshiftCorrection)
				  {
				    //	frameshiftCorrection = NO;
#if 0
				    NSLog(@"opti hook 1 (preferred)");
#endif
				  }
				else
				  {
				    lineDriftOffset
				      += ([thisInfo lineRange].length
					  - [ghostInfo lineRange].length
					  - [nextObject lineRange].length);
				    yDisplacement
				      += [thisInfo lineRect].origin.y
				      - [nextObject lineRect].origin.y;
				    rebuildLineDrift++;
				  }
			      }
			  }
		      }
		    else
		      lineDriftOffset += ([thisInfo lineRange].length
					  - [ghostInfo lineRange].length);

		    // is it possible to simply patch layout changes
		    // into layout array instead of doing a time
		    // consuming re - layout of the whole doc?
		    if ((currentLineIndex - 1 > insertionLineIndex
			 && !inBuckling && !isBuckled)
			&& (!(lineDriftOffset - insertionDelta)
			    || (nlDidShift && !lineDriftOffset)))
		      {
			unsigned erg =  [self _relocLayoutArray: ghostArray
					      atLine: aLine
					      offset: insertionDelta
					      lineTrift: rebuildLineDrift
					      floatTrift: yDisplacement];

			// y displacement: redisplay all remaining lines
			if (frameshiftCorrection)
			  erg = [lineLayoutInformation count] - aLine;
			else if (currentLineIndex - 1  == insertionLineIndex
				 && ABS(insertionDelta) == 1)
			  {
			    // return 2: redisplay only this and previous line
			    erg = 2;
			  }
#if 0
			NSLog(@"opti for: %d",erg);
#endif
			return NSMakeRange(aLine, MAX(1, erg));
		      }
		  }
		// end: optimization stuff--------------------------
		// -----------------------------------------------
		break;

		// newline - induced premature lineending: flush
	      }
	      else if ([lScanner isAtEnd])
		{
		  _GNULineLayoutInfo *thisInfo;
		  scannerPosition = [lScanner scanLocation];
		  [lineLayoutInformation
		    addObject: (thisInfo
				= [_GNULineLayoutInfo
				    lineLayoutWithRange:
				      NSMakeRange (startingLineCharIndex,
						   scannerPosition - localLineStartIndex)
				    rect: currentLineRect
				    type: LineLayoutInfoType_Text])];
		  currentLineIndex++;
		  startingLineCharIndex = NSMaxRange ([thisInfo lineRange]);

		  // check for optimization (lines after paragraph
		  // are unchanged and do not need redisplay/relayout)------
		  if (prevArrayEnum)
		    {
		      _GNULineLayoutInfo *ghostInfo = nil;

		      ghostInfo = [prevArrayEnum nextObject];

		      if (ghostInfo)
			{
			  if ([ghostInfo type] != [thisInfo type])
			    {
			      // frameshift correction for inserted newline
			      frameshiftCorrection = YES;

			      if (insertionDelta  == 1)
				{
				  [prevArrayEnum previousObject];
				  lineDriftOffset
				    += ([thisInfo lineRange].length
					- [ghostInfo lineRange].length) + insertionDelta;
				  rebuildLineDrift--;
				  yDisplacement
				    += [thisInfo lineRect].origin.y
				    - [ghostInfo lineRect].origin.y;
				}
			      else if (insertionDelta  == - 1)
				{
				  if (nlDidShift && frameshiftCorrection)
				    {
				      //	frameshiftCorrection = NO;
#if 0
				      NSLog(@"opti hook 2");
#endif
				    }
				}
			    }
			  else
			    lineDriftOffset
			      += ([thisInfo lineRange].length
				  - [ghostInfo lineRange].length);
			}
		      else
			{
			  // new array obviously longer than the previous one
			  prevArrayEnum = nil;
			}
		      // end: optimization stuff------------------------------
		      // -------------------------------------------
		    }
		}
	    }
	}
      // add the trailing newlines of current paragraph if any
      trailingNlRange
	= scanRange(pScanner, selectionParagraphGranularitySet);
      if (trailingNlRange.length)
	{
	  [self addNewlines: trailingNlRange
		intoLayoutArray: lineLayoutInformation
		atPoint: &drawingPoint
		width: width
		characterIndex: startingLineCharIndex
		ghostEnumerator: prevArrayEnum
		didShift: &nlDidShift
		verticalDisplacement: &yDisplacement];
	  if (nlDidShift)
	    {
	      if (insertionDelta == 1)
		{
		  frameshiftCorrection = YES;
		  rebuildLineDrift--;
		}
	      else if (insertionDelta == - 1)
		{
		  frameshiftCorrection = YES;
		  rebuildLineDrift++;
		}
	      else nlDidShift = NO;
	    }
	  currentLineIndex += trailingNlRange.length;
	}
    }

  // lines actually updated (optimized drawing)
  return NSMakeRange(aLine, MAX(1, [lineLayoutInformation count] - aLine));
}
// end: central line formatting method------------------------------------

// relies on lineLayoutInformation
- (void) drawLinesInLineRange: (NSRange)aRange;
{
  NSArray *linesToDraw = [lineLayoutInformation subarrayWithRange: aRange];
  NSEnumerator *lineEnum;
  _GNULineLayoutInfo *currentInfo;

  for ((lineEnum = [linesToDraw objectEnumerator]);
       (currentInfo = [lineEnum nextObject]);)
    {
      if ([currentInfo type] == LineLayoutInfoType_Paragraph)
	continue;	// e.g. for nl

      [_textStorage drawRange: [currentInfo lineRange]
		    atPoint: [currentInfo lineRect].origin];
	  // <!> make this use drawRange: inRect: in the future
	  // (for proper adoption of layout information [e.g. centering])
    }
}

// Draws the lines in the given rectangle and hands back the drawn 
// character range.
- (NSRange) drawRectCharacters: (NSRect)rect
{
  NSRange aRange = [self lineRangeForRect: rect];

  [self drawLinesInLineRange: aRange];
  return [self characterRangeForLineLayoutRange: aRange];
}

- (NSRange) lineRangeForRect: (NSRect)rect
{
  NSPoint upperLeftPoint = rect.origin;
  NSPoint lowerRightPoint = NSMakePoint (NSMaxX (rect), NSMaxY (rect));
  unsigned startLine, endLine;

  startLine = [self lineLayoutIndexForPoint: upperLeftPoint];
  endLine = [self lineLayoutIndexForPoint: lowerRightPoint];
  if (++endLine > [lineLayoutInformation count])
    endLine = [lineLayoutInformation count];

  return NSMakeRange(startLine, endLine - startLine);
}

@end




// begin: NSText------------------------------------------------------------

static NSNotificationCenter *nc;

@implementation NSText

//
// Class methods
//
+ (void)initialize
{
  if (self  == [NSText class])
    {
      NSArray  *types;

      [self setVersion: 1];                     // Initial version

      nc = [NSNotificationCenter defaultCenter];

      [self setSelectionWordGranularitySet:
	      [NSCharacterSet whitespaceCharacterSet]];
      [self setSelectionParagraphGranularitySet:
	      [NSCharacterSet characterSetWithCharactersInString:
				[self newlineString]]];
      types  = [NSArray arrayWithObjects: NSStringPboardType, NSRTFPboardType, NSRTFDPboardType, nil];

      [[NSApplication sharedApplication] registerServicesMenuSendTypes: types
					 returnTypes: types];
    }
}

//
// Instance methods
//
//
// Initialization
//

- (id) init
{
  return [self initWithFrame: NSMakeRect (0, 0, 100, 100)];
}

- (id) initWithFrame: (NSRect)frameRect
{
  [super initWithFrame: frameRect];

  [self setMinSize: frameRect.size];
  [self setMaxSize: NSMakeSize(HUGE,HUGE)];

  _tf.is_field_editor = NO;
  _tf.is_editable = YES;
  _tf.is_selectable = YES;
  _tf.is_rich_text = NO;
  _tf.imports_graphics = NO;
  _tf.draws_background = YES;
  _tf.is_horizontally_resizable = NO;
  _tf.is_vertically_resizable = YES;
  _tf.uses_font_panel = YES;
  _tf.uses_ruler = YES;
  _tf.is_ruler_visible = NO;
  ASSIGN(_caret_color, [NSColor blackColor]); 
  [self setTypingAttributes: [[self class] defaultTypingAttributes]];

  [self setBackgroundColor: [NSColor textBackgroundColor]];

  // sets up the contents object
  [self setString: @""];
  //[self setSelectedRange: NSMakeRange (0, 0)];
  return self;
}

- (void)dealloc
{
  RELEASE(_background_color);
  RELEASE(_caret_color);
  RELEASE(_textStorage);
  RELEASE(_typingAttributes);
  RELEASE(_layoutManager);

  [super dealloc];
}

/*
 * Getting and Setting Contents
 */
- (void) replaceCharactersInRange: (NSRange)aRange
			  withRTF: (NSData*)rtfData
{
  [self replaceRange: aRange
	withAttributedString: AUTORELEASE([[NSAttributedString alloc]
				 initWithRTF: rtfData
				 documentAttributes: NULL])];
}

- (void) replaceCharactersInRange: (NSRange)aRange
			 withRTFD: (NSData*)rtfdData
{
  [self replaceRange: aRange
	withAttributedString: AUTORELEASE([[NSAttributedString alloc]
				 initWithRTFD: rtfdData
				 documentAttributes: NULL])];
}

- (void) replaceCharactersInRange: (NSRange)aRange
		       withString: (NSString*)aString
{
  if (aRange.location == NSNotFound)
    return;

  if (![self shouldChangeTextInRange: aRange
	     replacementString: aString])
    return;  
  [_textStorage beginEditing];
  [_textStorage replaceCharactersInRange: aRange withString: aString];
  [_textStorage endEditing];
  [self didChangeText];
  [self sizeToFit];
}

- (void) setString: (NSString*)aString
{
  RELEASE(_textStorage);
  _textStorage = [[NSTextStorage alloc]
		   initWithString: aString
		   attributes: [self typingAttributes]];

  [self _buildUpLayout];
  [self sizeToFit];
  [self setSelectedRange: NSMakeRange (0, 0)];
  [self setNeedsDisplay: YES];
}

- (NSString*) string
{
    return [_textStorage string];
}

// old methods
- (void) replaceRange: (NSRange)aRange withRTFD: (NSData*)rtfdData
{
  [self replaceCharactersInRange: aRange withRTFD: rtfdData];
}

- (void) replaceRange: (NSRange)aRange withRTF: (NSData*)rtfData
{
  [self replaceCharactersInRange: aRange withRTF: rtfData];
}

- (void) replaceRange: (NSRange)aRange withString: (NSString*)aString
{
  [self replaceCharactersInRange: aRange withString: aString];
}

- (void) setText: (NSString*)aString range: (NSRange)aRange
{
  [self replaceCharactersInRange: aRange withString: aString];
}

- (void) setText: (NSString*)string
{
  [self setString: string];
}

- (NSString*) text
{
  return [self string];
}

//
// Graphic attributes
//
- (NSColor*) backgroundColor
{
  return _background_color;
}

- (BOOL) drawsBackground
{
  return _tf.draws_background;
}

- (void) setBackgroundColor: (NSColor*)color
{
  ASSIGN(_background_color, color);
}

- (void)setDrawsBackground: (BOOL)flag
{
  _tf.draws_background = flag;
}

//
// Managing Global Characteristics
//
- (BOOL) importsGraphics
{
  return _tf.imports_graphics;
}

- (BOOL) isEditable
{
  return _tf.is_editable;
}

- (BOOL) isFieldEditor
{
  return _tf.is_field_editor;
}

- (BOOL) isRichText
{
  return _tf.is_rich_text;
}

- (BOOL) isSelectable
{
  return _tf.is_selectable;
}

- (void)setEditable: (BOOL)flag
{
  _tf.is_editable = flag;
  // If we are editable then we are selectable
  if (flag)
    {
      _tf.is_selectable = YES;
      // FIXME: We should show the insertion point
    }
}

- (void) setFieldEditor: (BOOL)flag
{
  _tf.is_field_editor = flag;
}

- (void)setImportsGraphics: (BOOL)flag
{
  if (flag)
    _tf.is_rich_text = flag;
  // FIXME: When switched off remove attachments
  _tf.imports_graphics = flag;
}

- (void) setRichText: (BOOL)flag
{
  _tf.is_rich_text  = flag;
  if (!flag)
    {
      _tf.imports_graphics = flag;
      [self setString: [self string]];
    }
}

- (void)setSelectable: (BOOL)flag
{
  _tf.is_selectable = flag;
  // If we are not selectable then we must not be editable
  if (!flag)
    _tf.is_editable = NO;
}

//
// Using the font panel
//
- (BOOL) usesFontPanel
{
  return _tf.uses_font_panel;
}

- (void)setUsesFontPanel: (BOOL)flag
{
  _tf.uses_font_panel = flag;
}

//
// Managing the Ruler
//
- (BOOL) isRulerVisible
{
  return _tf.is_ruler_visible;
}

- (void) toggleRuler: (id)sender
{
  [self setRulerVisible: !_tf.is_ruler_visible];
}

//
// Managing the Selection
//
- (NSRange)selectedRange
{
  return _selected_range;
}

- (void) setSelectedRange: (NSRange)range
{
  NSRange oldRange = _selected_range;
  NSRange overlap;

  // Do ntohing if the range is still the same
  if (NSEqualRanges(range, oldRange))
    return;

  //<!> ask delegate for selection validation

  _selected_range  = range;
  [self updateFontPanel];

#if 0
  [nc postNotificationName: NSTextViewDidChangeSelectionNotification
      object: self
      userInfo: [NSDictionary dictionaryWithObjectsAndKeys:
				NSStringFromRange (_selected_range),
			      NSOldSelectedCharacterRange, nil]];
#endif

  // display
  if (range.length)
    {
      // <!>disable caret timed entry
    }
  else	// no selection
    {
      if (_tf.is_rich_text)
	{
	  [self setTypingAttributes: [_textStorage attributesAtIndex: range.location
						   effectiveRange: NULL]];
	}
      // <!>enable caret timed entry
    }

  if (!_window)
    return;

  // Make the selected range visible
  [self scrollRangeToVisible: _selected_range]; 

  // Redisplay what has changed
  // This does an unhighlight of the old selected region
  overlap = NSIntersectionRange(oldRange, _selected_range);
  if (overlap.length)
    {
      // Try to optimize for overlapping ranges
      [self setNeedsDisplayInRect: 
		[self rectForCharacterRange: 
			  MakeRangeFromAbs(MIN(range.location,
					       oldRange.location),
					   MAX(range.location,
					       oldRange.location))]];
      [self setNeedsDisplayInRect: 
		[self rectForCharacterRange: 
			  MakeRangeFromAbs(MIN(NSMaxRange(range),
					       NSMaxRange(oldRange)),
					   MAX(NSMaxRange(range),
					       NSMaxRange (oldRange)))]];
    }
  else
    {
      [self setNeedsDisplayInRect: [self rectForCharacterRange: range]];
      [self setNeedsDisplayInRect: [self rectForCharacterRange: oldRange]];
    }
}

/*
 * Copy and paste
 */
- (void) copy: (id)sender
{
  NSMutableArray *types = [NSMutableArray array];

  if (_tf.imports_graphics)
    [types addObject: NSRTFDPboardType];
  if (_tf.is_rich_text)
    [types addObject: NSRTFPboardType];

  [types addObject: NSStringPboardType];

  [self writeSelectionToPasteboard: [NSPasteboard generalPasteboard]
	types: types];
}

// Copy the current font to the font pasteboard
- (void) copyFont: (id)sender
{
  [self writeSelectionToPasteboard: [NSPasteboard pasteboardWithName: NSFontPboard]
	type: NSFontPboardType];
}

// Copy the current ruler settings to the ruler pasteboard
- (void) copyRuler: (id)sender
{
  [self writeSelectionToPasteboard: [NSPasteboard pasteboardWithName: NSRulerPboard]
	type: NSRulerPboardType];
}

- (void) delete: (id)sender
{
  [self deleteRange: _selected_range backspace: NO];
}

- (void) cut: (id)sender
{
  if (_selected_range.length)
    {
      [self copy: sender];
      [self delete: sender];
    }
}

- (void) paste: (id)sender
{
  [self readSelectionFromPasteboard: [NSPasteboard generalPasteboard]];
}

- (void) pasteFont: (id)sender
{
  [self readSelectionFromPasteboard:
	    [NSPasteboard pasteboardWithName: NSFontPboard]
	type: NSFontPboardType];
}

- (void) pasteRuler: (id)sender
{
  [self readSelectionFromPasteboard:
	    [NSPasteboard pasteboardWithName: NSRulerPboard]
	type: NSRulerPboardType];
}

- (void) selectAll: (id)sender
{
  [self setSelectedRange: NSMakeRange(0, [self textLength])];
}

/*
 * Managing Font
 */
- (NSFont*) font
{
  if ([_textStorage length])
    {
      NSFont *font = [_textStorage attribute: NSFontAttributeName
				   atIndex: 0
				   effectiveRange: NULL];
      if (font != nil)
	return font;
    }

  return [_typingAttributes objectForKey: NSFontAttributeName];
}

/*
 * This action method changes the font of the selection for a rich text object,
 * or of all text for a plain text object. If the receiver doesn't use the Font
 * Panel, however, this method does nothing.
 */
- (void) changeFont: (id)sender
{
  NSRange foundRange;
  int maxSelRange;
  NSRange aRange= [self rangeForUserCharacterAttributeChange];
  NSRange searchRange = aRange;
  NSFont *font;

  if (aRange.location == NSNotFound)
    return;

  if (![self shouldChangeTextInRange: aRange
	    replacementString: nil])
    return;
  [_textStorage beginEditing];
  for (maxSelRange = NSMaxRange(aRange);
       searchRange.location < maxSelRange;
       searchRange = NSMakeRange (NSMaxRange (foundRange),
				  maxSelRange - NSMaxRange(foundRange)))
    {
      font = [_textStorage attribute: NSFontAttributeName
			   atIndex: searchRange.location
			   longestEffectiveRange: &foundRange
			   inRange: searchRange];
      if (font != nil)
      {
	  [self setFont: [sender convertFont: font]
		ofRange: foundRange];
      }
    }
  [_textStorage endEditing];
  [self didChangeText];
  // Set typing attributes
  font = [_typingAttributes objectForKey: NSFontAttributeName];
  if (font != nil)
    {
      [_typingAttributes setObject: [sender convertFont: font] 
			 forKey: NSFontAttributeName];
    }
}

- (void) setFont: (NSFont*)font
{
  NSRange fullRange = NSMakeRange(0, [_textStorage length]);

  if (font == nil)
    return;

  [self setFont: font ofRange: fullRange];
  [_typingAttributes setObject: font forKey: NSFontAttributeName];
}

- (void) setFont: (NSFont*)font
	 ofRange: (NSRange)aRange
{
  if (font != nil)
    {
      if (![self shouldChangeTextInRange: aRange
		 replacementString: nil])
	return;
      [_textStorage beginEditing];
      [_textStorage addAttribute: NSFontAttributeName
		    value: font
		    range: aRange];
      [_textStorage endEditing];
      [self didChangeText];
    }
}

/*
 * Managing Alingment
 */
- (NSTextAlignment) alignment
{
  NSRange aRange = [self rangeForUserParagraphAttributeChange];
  NSParagraphStyle *aStyle;

  if (aRange.location != NSNotFound)
    {
      aStyle = [_textStorage attribute: NSParagraphStyleAttributeName
			     atIndex: aRange.location
			     effectiveRange: NULL];
      if (aStyle != nil)
	return [aStyle alignment]; 
    }

  // Get alignment from typing attributes
  return [[[self typingAttributes] 
	      objectForKey: NSParagraphStyleAttributeName] alignment];
}

- (void) setAlignment: (NSTextAlignment) mode
{
  [self setAlignment: mode
	range: NSMakeRange(0, [_textStorage length])];
}

- (void) alignCenter: (id) sender
{
  [self setAlignment: NSCenterTextAlignment
	range: [self rangeForUserParagraphAttributeChange]];
}

- (void) alignLeft: (id) sender
{
  [self setAlignment: NSLeftTextAlignment
	range: [self rangeForUserParagraphAttributeChange]];
}

- (void) alignRight: (id) sender
{
  [self setAlignment: NSRightTextAlignment
	range: [self rangeForUserParagraphAttributeChange]];
}

/*
 * Text colour
 */

- (NSColor*) textColor
{
  NSRange aRange = [self rangeForUserCharacterAttributeChange];

  if (aRange.location != NSNotFound)
    return [_textStorage attribute: NSForegroundColorAttributeName
			 atIndex: aRange.location
			 effectiveRange: NULL];
  else 
    return [_typingAttributes objectForKey: NSForegroundColorAttributeName];
}

- (void) setTextColor: (NSColor*) color
		range: (NSRange) aRange
{
  if (aRange.location == NSNotFound)
    return;

  if (![self shouldChangeTextInRange: aRange
	    replacementString: nil])
    return;
  [_textStorage beginEditing];
  if (color != nil)
    {
      [_textStorage addAttribute: NSForegroundColorAttributeName
		    value: color
		    range: aRange];
      [_typingAttributes setObject: color forKey: NSForegroundColorAttributeName];
    }
  else
    {
      [_textStorage removeAttribute: NSForegroundColorAttributeName
		    range: aRange];
    }
  [_textStorage endEditing];
  [self didChangeText];
}

- (void) setColor: (NSColor*) color
	  ofRange: (NSRange) aRange
{
  [self setTextColor: color range: aRange];
}

- (void) setTextColor: (NSColor*) color
{
  NSRange fullRange = NSMakeRange(0, [_textStorage length]);

  [self setTextColor: color range: fullRange];
}

//
// Text attributes
//
- (void) subscript: (id)sender
{
  NSNumber *value = [_typingAttributes 
		       objectForKey: NSSuperscriptAttributeName];
  int sValue;
  NSRange aRange = [self rangeForUserCharacterAttributeChange];

  if (aRange.location == NSNotFound)
    return;

  if (aRange.length)
    {
      if (![self shouldChangeTextInRange: aRange
		 replacementString: nil])
	return;
      [_textStorage beginEditing];
      [_textStorage subscriptRange: aRange];
      [_textStorage endEditing];
      [self didChangeText];
    }

  // Set the typing attributes
  if (value != nil)
    sValue = [value intValue] - 1;
  else
    sValue = -1;
  [_typingAttributes setObject: [NSNumber numberWithInt: sValue]
		     forKey: NSSuperscriptAttributeName];
}

- (void) superscript: (id)sender
{
  NSNumber *value = [_typingAttributes 
		       objectForKey: NSSuperscriptAttributeName];
  int sValue;
  NSRange aRange = [self rangeForUserCharacterAttributeChange];

  if (aRange.location == NSNotFound)
    return;

  if (aRange.length)
    {
      if (![self shouldChangeTextInRange: aRange
		 replacementString: nil])
	return;
      [_textStorage beginEditing];
      [_textStorage superscriptRange: aRange];
      [_textStorage endEditing];
      [self didChangeText];
    }

  // Set the typing attributes
  if (value != nil)
    sValue = [value intValue] + 1;
  else
    sValue = 1;
  [_typingAttributes setObject: [NSNumber numberWithInt: sValue]
		     forKey: NSSuperscriptAttributeName];
}

- (void) unscript: (id)sender
{
  NSRange aRange = [self rangeForUserCharacterAttributeChange];

  if (aRange.location == NSNotFound)
    return;

  if (aRange.length)
    {
      if (![self shouldChangeTextInRange: aRange
		 replacementString: nil])
	return;
      [_textStorage beginEditing];
      [_textStorage unscriptRange: aRange];
      [_textStorage endEditing];
      [self didChangeText];
    }

  // Set the typing attributes
  [_typingAttributes removeObjectForKey: NSSuperscriptAttributeName];
}

- (void) underline: (id)sender
{
  BOOL doUnderline = YES;
  NSRange aRange = [self rangeForUserCharacterAttributeChange];

  if (aRange.location == NSNotFound)
    return;

  if ([[_textStorage attribute: NSUnderlineStyleAttributeName
		     atIndex: aRange.location
		     effectiveRange: NULL] intValue])
    doUnderline = NO;

  if (aRange.length)
    {
      if (![self shouldChangeTextInRange: aRange
		 replacementString: nil])
	return;
      [_textStorage beginEditing];
      [_textStorage addAttribute: NSUnderlineStyleAttributeName
		    value: [NSNumber numberWithInt: doUnderline]
		    range: aRange];
      [_textStorage endEditing];
      [self didChangeText];
    }

  [_typingAttributes
      setObject: [NSNumber numberWithInt: doUnderline]
      forKey: NSUnderlineStyleAttributeName];
}

//
// Reading and Writing RTFD Files
//
- (BOOL) readRTFDFromFile: (NSString*)path
{
  NSAttributedString *peek = [[NSAttributedString alloc] 
				 initWithPath: path
				 documentAttributes: NULL];

  if (peek != nil)
    {
      if (!_tf.is_rich_text)
	{
	  [self setRichText: YES];
	}
      [self replaceRange: NSMakeRange (0, [self textLength])
	    withAttributedString: peek];
      RELEASE(peek);
      return YES;
    }
  return NO;
}

- (BOOL) writeRTFDToFile: (NSString*)path atomically: (BOOL)flag
{
  NSFileWrapper *wrapper = [_textStorage RTFDFileWrapperFromRange:
					   NSMakeRange(0, [_textStorage length])
					 documentAttributes: nil];
  return [wrapper writeToFile: path atomically: flag updateFilenames: YES];
}

- (NSData*) RTFDFromRange: (NSRange) aRange
{
  return [_textStorage RTFDFromRange: aRange
		       documentAttributes: nil];
}

- (NSData*) RTFFromRange: (NSRange) aRange
{
  return [_textStorage RTFFromRange: aRange
		       documentAttributes: nil];
}

//
// Sizing the Frame Rectangle
//
- (BOOL) isHorizontallyResizable
{
  return _tf.is_horizontally_resizable;
}

- (BOOL) isVerticallyResizable
{
  return _tf.is_vertically_resizable;
}

- (NSSize) maxSize
{
  return _maxSize;
}

- (NSSize) minSize
{
  return _minSize;
}

- (void)setHorizontallyResizable: (BOOL)flag
{
  _tf.is_horizontally_resizable = flag;
}

- (void)setMaxSize: (NSSize)newMaxSize
{
  _maxSize = newMaxSize;
}

- (void)setMinSize: (NSSize)newMinSize
{
  _minSize = newMinSize;
}

- (void) setVerticallyResizable: (BOOL)flag
{
  _tf.is_vertically_resizable = flag;
}

- (void) sizeToFit
{
  // if we are a field editor we don't have to handle the size.
  if ([self isFieldEditor])
    return;
  else
    {
      NSSize oldSize = _frame.size;
      float newWidth = oldSize.width;
      float newHeight = oldSize.height;
      NSRect textRect = [self _textBounds];
      NSSize newSize;

      if (_tf.is_horizontally_resizable)
	{
	  newWidth = textRect.size.width;
	}
      if (_tf.is_vertically_resizable)
	{
	  newHeight = textRect.size.height;
	}

      newSize = NSMakeSize(MIN(_maxSize.width, MAX(newWidth, _minSize.width)),
			   MIN(_maxSize.height, MAX(newHeight, _minSize.height)));
      if (!NSEqualSizes(oldSize, newSize))
	{
	  [self setFrameSize: newSize];
	}
    }
}

//
// Spelling
//

- (void) checkSpelling: (id)sender
{
  NSRange errorRange
    = [[NSSpellChecker sharedSpellChecker]
	checkSpellingOfString: [self string]
	startingAt: NSMaxRange (_selected_range)];

  if (errorRange.length)
    [self setSelectedRange: errorRange];
  else
    NSBeep();
}

- (void) showGuessPanel: (id)sender
{
  [[[NSSpellChecker sharedSpellChecker] spellingPanel] orderFront: self];
}

//
// Scrolling
//

- (void) scrollRangeToVisible: (NSRange) aRange
{
  // Don't try scrolling an ancestor clipview if we are field editor.
  // This makes things so much simpler and stabler for now.
  if (_tf.is_field_editor == NO)
    {
      [self scrollRectToVisible: [self rectForCharacterRange: 
					   _selected_range]];
    }
}


/*
 * Managing the Delegate
 */
- (id) delegate
{
  return _delegate;
}

- (void) setDelegate: (id) anObject
{
  if (_delegate)
    [nc removeObserver: _delegate name: nil object: self];
  ASSIGN(_delegate, anObject);

#define SET_DELEGATE_NOTIFICATION(notif_name) \
  if ([_delegate respondsToSelector: @selector(text##notif_name:)]) \
    [nc addObserver: _delegate \
          selector: @selector(text##notif_name:) \
              name: NSText##notif_name##Notification \
            object: self]

  SET_DELEGATE_NOTIFICATION(DidBeginEditing);
  SET_DELEGATE_NOTIFICATION(DidChange);
  SET_DELEGATE_NOTIFICATION(DidEndEditing);
}

//
// Handling Events
//
- (void) mouseDown: (NSEvent*)theEvent
{
  NSSelectionGranularity granularity = NSSelectByCharacter;
  NSRange chosenRange, proposedRange;
  NSPoint point, startPoint;
  NSEvent *currentEvent;
  unsigned startIndex;

  // If not selectable than don't recognize the mouse down
  if (!_tf.is_selectable)
    return;

  // Only try to make first responder if editable, otherwise the 
  // delegate will stop it in becomeFirstResponder.
  if (_tf.is_editable && ![_window makeFirstResponder: self])
    return;

  switch ([theEvent clickCount])
    {
    case 1: granularity = NSSelectByCharacter;
      break;
    case 2: granularity = NSSelectByWord;
      break;
    case 3: granularity = NSSelectByParagraph;
      break;
    }

  startPoint = [self convertPoint: [theEvent locationInWindow] fromView: nil];
  startIndex = [self characterIndexForPoint: startPoint];

  proposedRange = NSMakeRange(startIndex, 0);
  chosenRange = [self selectionRangeForProposedRange: proposedRange
		      granularity: granularity];

  [self setSelectedRange: chosenRange];
  // Do an imidiate redisplay for visual feedback
  [_window flushWindow];

  //<!> make this non - blocking (or make use of timed entries)
  // run modal loop
  for (currentEvent = [_window
			nextEventMatchingMask:
			  (NSLeftMouseDraggedMask|NSLeftMouseUpMask)];
       [currentEvent type] != NSLeftMouseUp;
       (currentEvent = [_window
			 nextEventMatchingMask:
			   (NSLeftMouseDraggedMask|NSLeftMouseUpMask)]))
    {
      BOOL didScroll = [self autoscroll: currentEvent];
      point = [self convertPoint: [currentEvent locationInWindow]
		    fromView: nil];
      proposedRange = MakeRangeFromAbs ([self characterIndexForPoint: point],
					startIndex);
      // Add one more character as selected, as zero length is cursor.
      proposedRange.length++;
 
      chosenRange = [self selectionRangeForProposedRange: proposedRange
			  granularity: granularity];

      [self setSelectedRange: chosenRange];

      if (didScroll)
	[self setNeedsDisplay: YES];
      // Do an imidiate redisplay for visual feedback
      [_window flushWindow];
    }

  NSDebugLog(@"chosenRange. location  = %d, length  = %d\n",
	     (int)chosenRange.location, (int)chosenRange.length);
  // remember for column stable cursor up/down
  _currentCursor = [self rectForCharacterIndex: chosenRange.location].origin;
}

- (void) keyDown: (NSEvent*)theEvent
{
  // If not editable, don't recognize the key down
  if (!_tf.is_editable)
    {
      [super keyDown: theEvent];
    }
  else
    {
      [self interpretKeyEvents: [NSArray arrayWithObject: theEvent]];
    }
}

- (void) insertNewline: (id) sender
{
  if (_tf.is_field_editor)
    {
      [self _illegalMovement: NSReturnTextMovement];
      return;
    }

  [self insertText: [[self class] newlineString]];
}

- (void) insertTab: (id) sender
{
  if (_tf.is_field_editor)
    {
      [self _illegalMovement: NSTabTextMovement];
      return;
    }

  [self insertText: @"\t"];
}

- (void) insertBacktab: (id) sender
{
  if (_tf.is_field_editor)
    {
      [self _illegalMovement: NSBacktabTextMovement];
      return;
    }

  //[self insertText: @"\t"];
}

- (void) deleteForward: (id) sender
{
  if (_selected_range.location != [self textLength])
    {
      /* Not at the end of text -- delete following character */
      [self deleteRange:
	      [self selectionRangeForProposedRange:
		      NSMakeRange (_selected_range.location, 1)
		    granularity: NSSelectByCharacter]
	    backspace: NO];
    }
  else
    {
      /* end of text: behave the same way as NSBackspaceKey */
      [self deleteBackward: sender];
    }
}

- (void) deleteBackward: (id) sender
{
  [self deleteRange: _selected_range backspace: YES];
}

//<!> choose granularity according to keyboard modifier flags
- (void) moveUp: (id) sender
{
  unsigned cursorIndex;
  NSPoint cursorPoint;
  NSRange newRange;

  if (_tf.is_field_editor)
    {
      [self _illegalMovement: NSUpTextMovement];
      return;
    }

  /* Do nothing if we are at beginning of text */
  if (_selected_range.location == 0)
    return;

  if (_selected_range.length)
    {
      _currentCursor = [self rectForCharacterIndex:
			       _selected_range.location].origin;
    }
  cursorIndex = _selected_range.location;
  cursorPoint = [self rectForCharacterIndex: cursorIndex].origin;
  cursorIndex = [self characterIndexForPoint:
			NSMakePoint (_currentCursor.x + 0.001,
				     MAX (0, cursorPoint.y - 0.001))];

  newRange.location = cursorIndex;
  newRange.length = 0;
  [self setSelectedRange: newRange];
}

- (void) moveDown: (id) sender
{
  unsigned cursorIndex;
  NSRect cursorRect;
  NSRange newRange;

  if (_tf.is_field_editor)
    {
      [self _illegalMovement: NSDownTextMovement];
      return;
    }

  /* Do nothing if we are at end of text */
  if (_selected_range.location == [self textLength])
    return;

  if (_selected_range.length != 0)
    {
      _currentCursor = [self rectForCharacterIndex:
			       NSMaxRange (_selected_range)].origin;
    }
  cursorIndex = _selected_range.location;
  cursorRect = [self rectForCharacterIndex: cursorIndex];
  cursorIndex = [self characterIndexForPoint:
			NSMakePoint (_currentCursor.x + 0.001,
				     NSMaxY (cursorRect) + 0.001)];

  newRange.location = cursorIndex;
  newRange.length = 0;
  [self setSelectedRange: newRange];
}

- (void) moveLeft: (id) sender
{
  NSRange newSelectedRange;

  /* Do nothing if we are at beginning of text */
  if (_selected_range.location == 0)
    return;

  newSelectedRange.location = _selected_range.location - 1;
  newSelectedRange.length = 0;

  [self setSelectedRange: newSelectedRange];

  _currentCursor.x = [self rectForCharacterIndex:
			   _selected_range.location].origin.x;
}

- (void) moveRight: (id) sender
{
  NSRange newSelectedRange;
  unsigned int length = [self textLength];

  /* Do nothing if we are at end of text */
  if (_selected_range.location == length)
    return;

  newSelectedRange.location = MIN (NSMaxRange (_selected_range) + 1, length);
  newSelectedRange.length = 0;

  [self setSelectedRange: newSelectedRange];

  _currentCursor.x = [self rectForCharacterIndex:
			   _selected_range.location].origin.x;
}

- (BOOL) acceptsFirstResponder
{
  if ([self isSelectable])
    return YES;
  else
    return NO;
}

- (BOOL) resignFirstResponder
{
  if (([self isEditable])
      && ([_delegate respondsToSelector: @selector(textShouldEndEditing:)])
      && ([_delegate textShouldEndEditing: self] == NO))
    return NO;

  // Add any clean-up stuff here

  if ([self shouldDrawInsertionPoint])
    {
      [self lockFocus];
      [self drawInsertionPointAtIndex: _selected_range.location
	    color: nil turnedOn: NO];
      [self unlockFocus];
      //<!> stop timed entry
    }

  [nc postNotificationName: NSTextDidEndEditingNotification  object: self];
  return YES;
}

- (BOOL) becomeFirstResponder
{
  if ([self isSelectable] == NO)
    return NO;

  if (([_delegate respondsToSelector: @selector(textShouldBeginEditing:)])
      && ([_delegate textShouldBeginEditing: self] == NO))
    return NO;

  // Add any initialization stuff here.

  //if ([self shouldDrawInsertionPoint])
  //  {
  //   [self lockFocus];
  //   [self drawInsertionPointAtIndex: _selected_range.location
  //      color: _caret_color turnedOn: YES];
  //   [self unlockFocus];
  //   //<!> restart timed entry
  //  }
  [nc postNotificationName: NSTextDidBeginEditingNotification  object: self];
  return YES;
}

- (void) drawRect: (NSRect)rect
{
  NSRange drawnRange;
  NSRange newRange;

  if (_tf.draws_background)
    {
      // clear area under text
      [[self backgroundColor] set];
      NSRectFill(rect);
    }

  drawnRange = [_layoutManager drawRectCharacters: rect];

  // We have to redraw the part of the selection that is inside
  // the redrawn lines
  newRange = NSIntersectionRange(_selected_range, drawnRange);
  // Was there any overlapping with the selection?
  if ((_selected_range.length &&
       NSLocationInRange(newRange.location, _selected_range)))
    {
      [self drawSelectionAsRangeNoCaret: newRange];
    }
  else if ([self shouldDrawInsertionPoint] && 
	   (_selected_range.location == newRange.location))
    {
      [self drawInsertionPointAtIndex: _selected_range.location
	    color: _caret_color
	    turnedOn: YES];
    }
}

// text lays out from top to bottom
- (BOOL) isFlipped
{
  return YES;
}

- (BOOL) isOpaque
{
  if (_tf.draws_background == NO
      || _background_color == nil
      || [_background_color alphaComponent] < 1.0)
    return NO;
  else
    return YES;
}


/*
 *     Handle enabling/disabling of services menu items.
 */
- (id) validRequestorForSendType: (NSString*) sendType
		      returnType: (NSString*) returnType
{
  if ((!sendType || (_selected_range.length && 
		     [sendType isEqual: NSStringPboardType]))
      && (!returnType || ([self isEditable] && 
			  [returnType isEqual: NSStringPboardType])))
    {
      return self;
    }

  return [super validRequestorForSendType: sendType
		returnType: returnType];

}

//
// NSCoding protocol
//
- (void)encodeWithCoder: aCoder
{
  BOOL flag;
  [super encodeWithCoder: aCoder];

  [aCoder encodeConditionalObject: _delegate];
  [aCoder encodeObject: _textStorage];

  flag = _tf.is_field_editor;
  [aCoder encodeValueOfObjCType: @encode(BOOL) at: &flag];
  flag = _tf.is_editable;
  [aCoder encodeValueOfObjCType: @encode(BOOL) at: &flag];
  flag = _tf.is_selectable;
  [aCoder encodeValueOfObjCType: @encode(BOOL) at: &flag];
  flag = _tf.is_rich_text;
  [aCoder encodeValueOfObjCType: @encode(BOOL) at: &flag];
  flag = _tf.imports_graphics;
  [aCoder encodeValueOfObjCType: @encode(BOOL) at: &flag];
  flag = _tf.draws_background;
  [aCoder encodeValueOfObjCType: @encode(BOOL) at: &flag];
  flag = _tf.is_horizontally_resizable;
  [aCoder encodeValueOfObjCType: @encode(BOOL) at: &flag];
  flag = _tf.is_vertically_resizable;
  [aCoder encodeValueOfObjCType: @encode(BOOL) at: &flag];
  flag = _tf.uses_font_panel;
  [aCoder encodeValueOfObjCType: @encode(BOOL) at: &flag];
  flag = _tf.uses_ruler;
  [aCoder encodeValueOfObjCType: @encode(BOOL) at: &flag];
  flag = _tf.is_ruler_visible;
  [aCoder encodeValueOfObjCType: @encode(BOOL) at: &flag];
  flag = _tf.smart_insert_delete;
  [aCoder encodeValueOfObjCType: @encode(BOOL) at: &flag];
  flag = _tf.allows_undo;
  [aCoder encodeValueOfObjCType: @encode(BOOL) at: &flag];

  [aCoder encodeObject: _typingAttributes];
  [aCoder encodeObject: _background_color];
  [aCoder encodeValueOfObjCType: @encode(NSRange) at: &_selected_range];
  [aCoder encodeObject: _caret_color];
  [aCoder encodeValueOfObjCType: @encode(NSSize) at: &_minSize];
  [aCoder encodeValueOfObjCType: @encode(NSSize) at: &_maxSize];
}

- initWithCoder: aDecoder
{
  BOOL flag;
  [super initWithCoder: aDecoder];

  _delegate  = [aDecoder decodeObject];
  _textStorage = [aDecoder decodeObject];

  [aDecoder decodeValueOfObjCType: @encode(BOOL) at: &flag];
  _tf.is_field_editor = flag;
  [aDecoder decodeValueOfObjCType: @encode(BOOL) at: &flag];
  _tf.is_editable = flag;
  [aDecoder decodeValueOfObjCType: @encode(BOOL) at: &flag];
  _tf.is_selectable = flag;
  [aDecoder decodeValueOfObjCType: @encode(BOOL) at: &flag];
  _tf.is_rich_text = flag;
  [aDecoder decodeValueOfObjCType: @encode(BOOL) at: &flag];
  _tf.imports_graphics = flag;
  [aDecoder decodeValueOfObjCType: @encode(BOOL) at: &flag];
  _tf.draws_background = flag;
  [aDecoder decodeValueOfObjCType: @encode(BOOL) at: &flag];
  _tf.is_horizontally_resizable = flag;
  [aDecoder decodeValueOfObjCType: @encode(BOOL) at: &flag];
  _tf.is_vertically_resizable = flag;
  [aDecoder decodeValueOfObjCType: @encode(BOOL) at: &flag];
  _tf.uses_font_panel = flag;
  [aDecoder decodeValueOfObjCType: @encode(BOOL) at: &flag];
  _tf.uses_ruler = flag;
  [aDecoder decodeValueOfObjCType: @encode(BOOL) at: &flag];
  _tf.is_ruler_visible = flag;
  [aDecoder decodeValueOfObjCType: @encode(BOOL) at: &flag];
  _tf.smart_insert_delete = flag;
  [aDecoder decodeValueOfObjCType: @encode(BOOL) at: &flag];
  _tf.allows_undo = flag;

  _typingAttributes  = [aDecoder decodeObject];
  _background_color  = [aDecoder decodeObject];
  [aDecoder decodeValueOfObjCType: @encode(NSRange) at: &_selected_range];
  _caret_color  = [aDecoder decodeObject];
  [aDecoder decodeValueOfObjCType: @encode(NSSize) at: &_minSize];
  [aDecoder decodeValueOfObjCType: @encode(NSSize) at: &_maxSize];

  // build up the layout information that dont get stored
  [self _buildUpLayout];
  return self;
}

//
// NSChangeSpelling protocol
//

- (void) changeSpelling: (id)sender
{
  [self insertText: [[(NSControl*)sender selectedCell] stringValue]];
}

//
// NSIgnoreMisspelledWords protocol
//
- (void) ignoreSpelling: (id)sender
{
  [[NSSpellChecker sharedSpellChecker]
    ignoreWord: [[(NSControl*)sender selectedCell] stringValue]
    inSpellDocumentWithTag: [self spellCheckerDocumentTag]];
}
@end

@implementation NSText(GNUstepExtension)

+ (NSString*) newlineString
{
  return @"\n";
}

- (void) replaceRange: (NSRange) aRange
 withAttributedString: (NSAttributedString*) attrString
{
  if (aRange.location == NSNotFound)
    return;

  if (![self shouldChangeTextInRange: aRange
	     replacementString: [attrString string]])
    return;

  [_textStorage beginEditing];
  if (_tf.is_rich_text)
    [_textStorage replaceCharactersInRange: aRange
		  withAttributedString: attrString];
  else
    [_textStorage replaceCharactersInRange: aRange
		  withString: [attrString string]];
  [_textStorage endEditing];
  [self didChangeText];
  // ScrollView interaction
  [self sizeToFit];
}

- (unsigned) textLength
{
  return [_textStorage length];
}

- (void) sizeToFit: (id)sender
{
  [self sizeToFit];
}

@end

@implementation NSText(NSTextView)

- (void) setRulerVisible: (BOOL)flag
{
  NSScrollView *sv = [self enclosingScrollView];

  _tf.is_ruler_visible = flag;
  if (sv != nil)
    [sv setRulersVisible: _tf.is_ruler_visible];
}

- (int) spellCheckerDocumentTag
{
  if (!_spellCheckerDocumentTag)
    _spellCheckerDocumentTag = [NSSpellChecker uniqueSpellDocumentTag];

  return _spellCheckerDocumentTag;
}

- (BOOL) shouldChangeTextInRange: (NSRange)affectedCharRange
	       replacementString: (NSString*)replacementString
{
  return YES;
}

- (void) didChangeText
{
  [nc postNotificationName: NSTextDidChangeNotification  object: self];
}

// central text inserting method (takes care
// of optimized redraw/ cursor positioning)
- (void) insertText: (NSString*) insertString
{
  NSRange insertRange = [self rangeForUserTextChange];

  if (insertRange.location == NSNotFound)
    return;

  if (_tf.is_rich_text)
    {
      [self replaceRange: insertRange
	    withAttributedString: AUTORELEASE([[NSAttributedString alloc]
				     initWithString: insertString
				     attributes: [self typingAttributes]])];
    }
  else
    {
      [self replaceCharactersInRange: insertRange
	    withString: insertString];
    }

  // move cursor <!> [self selectionRangeForProposedRange: ]
  [self setSelectedRange:
	  NSMakeRange (insertRange.location + [insertString length], 0)];

  // remember x for row - stable cursor movements
  _currentCursor = [self rectForCharacterIndex:
			   _selected_range.location].origin;
}

- (void) setTypingAttributes: (NSDictionary*) dict
{
  if (dict == nil)
    dict = [[self class] defaultTypingAttributes];

  if (![dict isKindOfClass: [NSMutableDictionary class]])
    {
      RELEASE(_typingAttributes);
      _typingAttributes = [[NSMutableDictionary alloc] initWithDictionary: dict];
    }
  else
    ASSIGN(_typingAttributes, (NSMutableDictionary*)dict);
}

- (NSDictionary*) typingAttributes
{
  return [NSDictionary dictionaryWithDictionary: _typingAttributes];
}

- (void) updateFontPanel
{
  // update fontPanel only if told so
  if (_tf.uses_font_panel)
    {
      NSRange longestRange;
      NSFont *currentFont = [_textStorage attribute: NSFontAttributeName
				  atIndex: _selected_range.location
				  longestEffectiveRange: &longestRange
				  inRange: _selected_range];

      [[NSFontManager sharedFontManager] 
	  setSelectedFont: currentFont
	  isMultiple: !NSEqualRanges(longestRange, _selected_range)];
    }
}

- (BOOL) shouldDrawInsertionPoint
{
  return (_selected_range.length == 0) && [self isEditable];
}

- (void) drawInsertionPointInRect: (NSRect)rect
			    color: (NSColor*)color
			 turnedOn: (BOOL)flag
{
  if (!_window)
    return;

  if (flag)
    {
      [color set];
      NSRectFill(rect);
    }
  else
    {
      [[self backgroundColor] set];
      NSRectFill(rect);
      // FIXME: We should redisplay the character the cursor was on.
      //[self setNeedsDisplayInRect: rect];
    }

  [_window flushWindow];
}

- (NSRange) selectionRangeForProposedRange: (NSRange)proposedCharRange
			       granularity: (NSSelectionGranularity)granularity
{
  unsigned index;
  NSRange aRange;
  NSRange newRange;
  NSString *string = [self string];
  unsigned length = [string length];

  if (proposedCharRange.location >= length)
    {
      proposedCharRange.location = length;
      proposedCharRange.length = 0;
      return proposedCharRange;
    }

  if (NSMaxRange(proposedCharRange) > length)
    {
      proposedCharRange.length = length - proposedCharRange.location;
    }

  if (length == 0)
    {
      return proposedCharRange;
    }

  switch (granularity)
    {
    case NSSelectByWord:
      /* FIXME: The following code (or the routines it calls) does the
	 wrong thing when you double-click on the space between two
	 words */
      if ((proposedCharRange.location + 1) < length)
	{
	  index = [_textStorage nextWordFromIndex: 
				  (proposedCharRange.location + 1)
				forward: NO];
	}
      else
	{
	  /* Exception: end of text */
	  index = [_textStorage nextWordFromIndex: proposedCharRange.location
				forward: NO];
	}
      newRange.location = index;
      index = [_textStorage nextWordFromIndex: NSMaxRange (proposedCharRange)
                                      forward: YES];
      if (index <= newRange.location)
	{
	  newRange.length = 0;
	}
      else
	{
	  if (index == length)
	    {
	      /* We are at the end of text ! */
	      newRange.length = index - newRange.location;
	    }
	  else 
	    {
	      /* FIXME: The following will not work if there is more than a 
		 single character between the two words ! */
	      newRange.length = index - 1 - newRange.location;
	    }
	}
      return newRange;

    case NSSelectByParagraph:
      return [string lineRangeForRange: proposedCharRange];

    case NSSelectByCharacter:
    default:
      if (proposedCharRange.length == 0)
	return proposedCharRange;

      /* Expand the beginning character */
      index = proposedCharRange.location;
      newRange = [string rangeOfComposedCharacterSequenceAtIndex: index];
      /* If the proposedCharRange is empty we only ajust the beginning */
      if (proposedCharRange.length == 0)
	{
	  return newRange;
	}
      /* Expand the finishing character */
      index = NSMaxRange (proposedCharRange) - 1;
      aRange = [string rangeOfComposedCharacterSequenceAtIndex: index];
      newRange.length = NSMaxRange(aRange) - newRange.location;
      return newRange;
    }
}

- (NSRange) rangeForUserCharacterAttributeChange
{
  if (!_tf.is_editable || !_tf.uses_font_panel)
    return NSMakeRange(NSNotFound, 0);

  if (_tf.is_rich_text)
    // This expects the selection to be already corrected to characters
    return _selected_range;
  else
    return NSMakeRange(0, [_textStorage length]);
}

- (NSRange) rangeForUserParagraphAttributeChange
{
  if (!_tf.is_editable || !_tf.uses_ruler)
    return NSMakeRange(NSNotFound, 0);

  if (_tf.is_rich_text)
    return [self selectionRangeForProposedRange: _selected_range
		granularity: NSSelectByParagraph];
  else
    return NSMakeRange(0, [_textStorage length]);
}

- (NSRange) rangeForUserTextChange
{
  if (!_tf.is_editable)
    return NSMakeRange(NSNotFound, 0);
  
  // This expects the selection to be already corrected to characters
  return _selected_range;
}

- (void) setAlignment: (NSTextAlignment)alignment
		range: (NSRange)aRange
{ 
  NSParagraphStyle *style;
  NSMutableParagraphStyle *mstyle;
  
  if (aRange.location == NSNotFound)
    return;

  if (![self shouldChangeTextInRange: aRange
	    replacementString: nil])
    return;
  [_textStorage beginEditing];
  [_textStorage setAlignment: alignment
		range: aRange];
  [_textStorage endEditing];
  [self didChangeText];

  // Set the typing attributes
  style = [_typingAttributes objectForKey: NSParagraphStyleAttributeName];
  if (style == nil)
    style = [NSParagraphStyle defaultParagraphStyle];

  mstyle = [style mutableCopy];

  [mstyle setAlignment: alignment];
  // FIXME: Should use setTypingAttributes
  [_typingAttributes setObject: mstyle forKey: NSParagraphStyleAttributeName];
}

- (NSString*) preferredPasteboardTypeFromArray: (NSArray*)availableTypes
		    restrictedToTypesFromArray: (NSArray*)allowedTypes
{
  NSEnumerator *enumerator;
  NSString *type;

  if (availableTypes == nil)
    return nil;

  if (allowedTypes == nil)
    return [availableTypes objectAtIndex: 0];
    
  enumerator = [allowedTypes objectEnumerator];
  while ((type = [enumerator nextObject]) != nil)
    {
      if ([availableTypes containsObject: type])
        {
	  return type;
        }
    }
  return nil;  
}

- (BOOL) readSelectionFromPasteboard: (NSPasteboard*)pboard
{
/*
Reads the text view's preferred type of data from the pasteboard specified
by the pboard parameter. This method
invokes the preferredPasteboardTypeFromArray: restrictedToTypesFromArray: 
method to determine the text view's
preferred type of data and then reads the data using the
readSelectionFromPasteboard: type: method. Returns YES if the
data was successfully read.
*/
  NSString *type = [self preferredPasteboardTypeFromArray: [pboard types]
			 restrictedToTypesFromArray: [self readablePasteboardTypes]];
  
  if (type == nil)
    return NO;

  return [self readSelectionFromPasteboard: pboard
	       type: type];
}

- (BOOL) readSelectionFromPasteboard: (NSPasteboard*)pboard
				type: (NSString*)type 
{
/*
Reads data of the given type from pboard. The new data is placed at the
current insertion point, replacing the current selection if one exists.
Returns YES if the data was successfully read.

You should override this method to read pasteboard types other than the
default types. Use the rangeForUserTextChange method to obtain the range
of characters (if any) to be replaced by the new data.
*/

  if ([type isEqualToString: NSStringPboardType])
    {
      [self insertText: [pboard stringForType: NSStringPboardType]];
      return YES;
    } 

  if ([self isRichText])
    {
      if ([type isEqualToString: NSRTFPboardType])
	{
	  [self replaceCharactersInRange: [self rangeForUserTextChange]
		withRTF: [pboard dataForType: NSRTFPboardType]];
	  return YES;
	}
    }

  if (_tf.imports_graphics)
    {
      if ([type isEqualToString: NSRTFDPboardType])
	{
	  [self replaceCharactersInRange: [self rangeForUserTextChange]
		withRTFD: [pboard dataForType: NSRTFDPboardType]];
	  return YES;
	}
      // FIXME: Should also support: NSTIFFPboardType
      if ([type isEqualToString: NSFileContentsPboardType])
	{
	  NSTextAttachment *attachment = [[NSTextAttachment alloc] 
					      initWithFileWrapper: 
						  [pboard readFileWrapper]];

	  [self replaceRange: [self rangeForUserTextChange]
		withAttributedString: 
		    [NSAttributedString attributedStringWithAttachment: attachment]];
	  RELEASE(attachment);
	  return YES;
	}
    }

  // color accepting
  if ([type isEqualToString: NSColorPboardType])
    {
      NSColor *color = [NSColor colorFromPasteboard: pboard];
      NSRange aRange = [self rangeForUserCharacterAttributeChange];

      if (aRange.location != NSNotFound)
	[self setTextColor: color range: aRange];

      return YES;
    }

  // font pasting
  if ([type isEqualToString: NSFontPboardType])
    {
      // FIXME - This should use a serializer. To get that working a helper object 
      // is needed that implements the NSObjCTypeSerializationCallBack protocol.
      // We should add this later, currently the NSArchiver is used.
      // Thanks to Richard, for pointing this out.
      NSData *data = [pboard dataForType: NSFontPboardType];
      NSDictionary *dict = [NSUnarchiver unarchiveObjectWithData: data];

      if (dict != nil)
	{
	  [self setAttributes: dict 
		range: [self rangeForUserCharacterAttributeChange]];
	  return YES;
	}
      return NO;
    }

  // ruler pasting
  if ([type isEqualToString: NSRulerPboardType])
    {
      // FIXME: see NSFontPboardType above
      NSData *data = [pboard dataForType: NSRulerPboardType];
      NSDictionary *dict = [NSUnarchiver unarchiveObjectWithData: data];

      if (dict != nil)
	{
	  [self setAttributes: dict 
		range: [self rangeForUserParagraphAttributeChange]];
	  return YES;
	}
      return NO;
    }
 
  return NO;
}

- (NSArray*) readablePasteboardTypes
{
  // get default types, what are they?
  NSMutableArray *ret = [NSMutableArray arrayWithObjects: NSRulerPboardType,
					NSColorPboardType, NSFontPboardType, nil];

  if (_tf.imports_graphics)
    {
      [ret addObject: NSRTFDPboardType];
      //[ret addObject: NSTIFFPboardType];
      [ret addObject: NSFileContentsPboardType];
    }
  if (_tf.is_rich_text)
    [ret addObject: NSRTFPboardType];

  [ret addObject: NSStringPboardType];

  return ret;
}

- (NSArray*) writablePasteboardTypes
{
  // the selected text can be written to the pasteboard with which types.
  return [self readablePasteboardTypes];
}

- (BOOL) writeSelectionToPasteboard: (NSPasteboard*)pboard
			       type: (NSString*)type
{
/*
Writes the current selection to pboard using the given type. Returns YES
if the data was successfully written. You can override this method to add
support for writing new types of data to the pasteboard. You should invoke
super's implementation of the method to handle any types of data your
overridden version does not.
*/

  return [self writeSelectionToPasteboard: pboard
	       types: [NSArray arrayWithObject: type]];
}

- (BOOL) writeSelectionToPasteboard: (NSPasteboard*)pboard
			      types: (NSArray*)types
{

/* Writes the current selection to pboard under each type in the types
array. Returns YES if the data for any single type was written
successfully.

You should not need to override this method. You might need to invoke this
method if you are implementing a new type of pasteboard to handle services
other than copy/paste or dragging. */
  BOOL ret = NO;
  NSEnumerator *enumerator;
  NSString *type;

  if (types == nil)
    return NO;

  [pboard declareTypes: types owner: self];
    
  enumerator = [types objectEnumerator];
  while ((type = [enumerator nextObject]) != nil)
    {
      if ([type isEqualToString: NSStringPboardType])
        {
	  ret = ret || [pboard setString: [[self string] substringWithRange: _selected_range] 
			       forType: NSStringPboardType];
	}

      if ([type isEqualToString: NSRTFPboardType])
        {
	  ret = ret || [pboard setData: [self RTFFromRange: _selected_range]
			       forType: NSRTFPboardType];
	}

      if ([type isEqualToString: NSRTFDPboardType])
        {
	  ret = ret || [pboard setData: [self RTFDFromRange: _selected_range]
			       forType: NSRTFDPboardType];
	}

      if ([type isEqualToString: NSColorPboardType])
        {
	  NSColor *color = [self textColor];

	  if (color != nil)
	    {
	      [color writeToPasteboard:  pboard];
	      ret = YES;
	    }
	}

      if ([type isEqualToString: NSFontPboardType])
        {
	  NSDictionary *dict = [_textStorage fontAttributesInRange: _selected_range];

	  if (dict != nil)
	    {
	      // FIXME - This should use a serializer. To get that working a helper object 
	      // is needed that implements the NSObjCTypeSerializationCallBack protocol.
	      // We should add this later, currently the NSArchiver is used.
	      // Thanks to Richard, for pointing this out.
	      [pboard setData: [NSArchiver archivedDataWithRootObject: dict]
		      forType: NSFontPboardType];
	      ret = YES;
	    }
	}

      if ([type isEqualToString: NSRulerPboardType])
        {
	  NSDictionary *dict = [_textStorage rulerAttributesInRange: _selected_range];

	  if (dict != nil)
	    {
	      //FIXME: see NSFontPboardType above
	      [pboard setData: [NSArchiver archivedDataWithRootObject: dict]
		      forType: NSRulerPboardType];
	      ret = YES;
	    }
	}
    }

  return ret;
}

@end

@implementation NSText(GNUstepPrivate)

+ (void) setSelectionWordGranularitySet: (NSCharacterSet*) aSet
{
  ASSIGN(selectionWordGranularitySet, aSet);
  ASSIGN(invSelectionWordGranularitySet, [aSet invertedSet]);
}

+ (void) setSelectionParagraphGranularitySet: (NSCharacterSet*) aSet
{
  ASSIGN(selectionParagraphGranularitySet, aSet);
  ASSIGN(invSelectionParagraphGranularitySet, [aSet invertedSet]);
}

+ (NSDictionary*) defaultTypingAttributes
{
  return [NSDictionary dictionaryWithObjectsAndKeys:
			 [NSParagraphStyle defaultParagraphStyle], NSParagraphStyleAttributeName,
			 [NSFont userFontOfSize: 12], NSFontAttributeName,
		         [NSColor textColor], NSForegroundColorAttributeName,
		         nil];
}

- (void) setAttributes: (NSDictionary*) attributes range: (NSRange) aRange
{
  NSString *type;
  id val;
  NSEnumerator *enumerator = [attributes keyEnumerator];

  if (aRange.location == NSNotFound)
    return;
  if (![self shouldChangeTextInRange: aRange
	     replacementString: nil])
    return;
	      
  [_textStorage beginEditing];
  while ((type = [enumerator nextObject]) != nil)
    {
      val = [attributes objectForKey: type];
      [_textStorage addAttribute: type
		    value: val
		    range: aRange];
    }
  [_textStorage endEditing];
  [self didChangeText];
}

- (void) _illegalMovement: (int) textMovement
{
  // This is similar to [self resignFirstResponder],
  // with the difference that in the notification we need
  // to put the NSTextMovement, which resignFirstResponder
  // does not.  Also, if we are ending editing, we are going
  // to be removed, so it's useless to update any drawing.
  NSNumber *number;
  NSDictionary *uiDictionary;
  
  if (([self isEditable])
      && ([_delegate respondsToSelector:
		       @selector(textShouldEndEditing:)])
      && ([_delegate textShouldEndEditing: self] == NO))
    return;
  
  // Add any clean-up stuff here
  
  number = [NSNumber numberWithInt: textMovement];
  uiDictionary = [NSDictionary dictionaryWithObject: number
			       forKey: @"NSTextMovement"];
  [nc postNotificationName: NSTextDidEndEditingNotification
      object: self  userInfo: uiDictionary];
  return;
}

// begin: dragging of colors and files---------------
- (unsigned int) draggingEntered: (id <NSDraggingInfo>)sender
{
  return NSDragOperationGeneric;
}

- (unsigned int) draggingUpdated: (id <NSDraggingInfo>)sender
{
  return NSDragOperationGeneric;
}

- (void) draggingExited: (id <NSDraggingInfo>)sender
{
}

- (BOOL) prepareForDragOperation: (id <NSDraggingInfo>)sender
{
  return YES;
}

- (BOOL) performDragOperation: (id <NSDraggingInfo>)sender
{
  return [self readSelectionFromPasteboard: [sender draggingPasteboard]];
}

- (void) concludeDragOperation: (id <NSDraggingInfo>)sender
{
}
// end: drag accepting---------------------------------

// central text deletion/backspace method
// (takes care of optimized redraw/ cursor positioning)
- (void) deleteRange: (NSRange) aRange
	   backspace: (BOOL) flag
{
  NSRange deleteRange;

  if (aRange.location == NSNotFound)
    return;

  if (!aRange.length && !(flag && aRange.location))
    return;

  if (aRange.length)
    {
      deleteRange = aRange;
    }
  else
    {
      deleteRange = NSMakeRange (MAX (0, aRange.location - 1), 1);
    }

  if (![self shouldChangeTextInRange: deleteRange
	    replacementString: @""])
    return;
  [_textStorage beginEditing];
  [_textStorage deleteCharactersInRange: deleteRange];
  [_textStorage endEditing];
  [self didChangeText];

  // ScrollView interaction
  [self sizeToFit];

  // move cursor <!> [self selectionRangeForProposedRange: ]
  [self setSelectedRange: NSMakeRange (deleteRange.location, 0)];

  // remember x for row - stable cursor movements
  _currentCursor = [self rectForCharacterIndex:
			   _selected_range.location].origin;
}

- (unsigned) characterIndexForPoint: (NSPoint) point
{
  return [_layoutManager characterIndexForPoint: point];
}

- (NSRect) rectForCharacterIndex: (unsigned) index
{
  return [_layoutManager rectForCharacterIndex: index];
}

- (NSRect) rectForCharacterRange: (NSRange) aRange
{
  return [_layoutManager rectForCharacterRange: aRange];
}

- (void) _buildUpLayout
{
  if (_layoutManager == nil)
    _layoutManager = [[GSSimpleLayoutManager alloc]
		       initForText: self];

  [_textStorage addLayoutManager: _layoutManager];
}

// Returns the currently used bounds for all the text
- (NSRect) _textBounds
{
  return [_layoutManager _textBounds];
}

- (void) drawInsertionPointAtIndex: (unsigned) index
			     color: (NSColor*) color
			  turnedOn: (BOOL) flag
{
  NSRect drawRect  = [self rectForCharacterIndex: index];

  drawRect.size.width = 1;
  if (drawRect.size.height == 0)
    drawRect.size.height = 12;

  if (flag && color == nil)
    color = _caret_color;

  [self drawInsertionPointInRect: drawRect
	color: color
	turnedOn: flag];
}

- (void) drawSelectionAsRangeNoCaret: (NSRange) aRange
{
  if (aRange.length)
    {
      NSRect startRect = [self rectForCharacterIndex: aRange.location];
      NSRect endRect = [self rectForCharacterIndex: NSMaxRange (aRange)];
      float maxWidth = _frame.size.width;

      if (startRect.origin.y  == endRect.origin.y)
	{
	  // single line selection
	  NSHighlightRect (NSMakeRect (startRect.origin.x, startRect.origin.y,
				       endRect.origin.x - startRect.origin.x,
				       startRect.size.height));
	}
      else if (startRect.origin.y == endRect.origin.y - endRect.size.height)
	{
	  // two line selection

	  // first line
	  NSHighlightRect (NSMakeRect (startRect.origin.x, startRect.origin.y,
				       maxWidth - startRect.origin.x,
				       startRect.size.height));
	  // second line
	  NSHighlightRect (NSMakeRect (0, endRect.origin.y, endRect.origin.x,
				       endRect.size.height));

	}
      else
	{
	  //   3 Rects: multiline selection

	  // first line
	  NSHighlightRect (NSMakeRect (startRect.origin.x, startRect.origin.y,
				       maxWidth - startRect.origin.x,
				       startRect.size.height));
	  // intermediate lines
	  NSHighlightRect (NSMakeRect (0, NSMaxY(startRect),
				       maxWidth,
				       endRect.origin.y - NSMaxY (startRect)));
	  // last line
	  NSHighlightRect (NSMakeRect (0, endRect.origin.y, endRect.origin.x,
				       endRect.size.height));
	}
    }
}

@end