//  NSTextView_Lines.m

//  TipWrapper

//  Copyright (c) 2003 Apple Computer, Inc. All rights reserved.

//  See legal notice at end of file.

#import "NSTextView_Lines.h"

@implementation NSTextView (Lines)

- (unsigned int) numberOfLines

{

    unsigned int    result;

    NSLayoutManager *lm;

    int             glyphIndex;

    NSRange         allCharactersRange, allGlyphsRange;

    NSRange         lineFragmentGlyphRange;

    result = 0;

    //  Note our range of characters

    allCharactersRange = NSMakeRange (0, [[self string] length]);

    //  Find how many glyphs there are

    lm = [self layoutManager];

    allGlyphsRange = [lm glyphRangeForCharacterRange: allCharactersRange

        actualCharacterRange: NULL];

    glyphIndex = 0;

    while (glyphIndex < NSMaxRange (allGlyphsRange))

    {

        (void) [lm lineFragmentRectForGlyphAtIndex: glyphIndex

            effectiveRange: &lineFragmentGlyphRange];

        //  Count the line we found

        ++result;

        //  Move to the start of the next line

        glyphIndex = NSMaxRange (lineFragmentGlyphRange);

    }

    return result;

}

//  lines -- Return the lines as an array of strings, reflecting both hard and soft line breaks.

//  This is a lot like code above. It would be better to create an enumerator to return line ranges,

//  then have both the method above and this method use that enumerator.

- (NSArray *) lines

{

    NSString        *s;

    NSMutableArray  *result;

    NSLayoutManager *lm;

    int             glyphIndex;

    NSRange         allCharactersRange, allGlyphsRange;

    NSRange         lineFragmentGlyphRange, lineFragmentCharacterRange;

    s = [self string];

    result = [NSMutableArray array];

    //  Find our range of characters

    allCharactersRange = NSMakeRange (0, [[self string] length]);

    //  Find how many glyphs there are

    lm = [self layoutManager];

    allGlyphsRange = [lm glyphRangeForCharacterRange: allCharactersRange

        actualCharacterRange: NULL];

    glyphIndex = 0;

    while (glyphIndex < NSMaxRange (allGlyphsRange))

    {

        NSString    *oneLine;

        (void) [lm lineFragmentRectForGlyphAtIndex: glyphIndex

            effectiveRange: &lineFragmentGlyphRange];

        lineFragmentCharacterRange =

            [lm characterRangeForGlyphRange: lineFragmentGlyphRange  actualGlyphRange: NULL];

        oneLine = [s substringWithRange: lineFragmentCharacterRange];

        [result addObject: oneLine];

        glyphIndex = NSMaxRange (lineFragmentGlyphRange);

    }

    return result;

}

//  setLineSpacingTo: -- Set the line spacing of the text we currently hold.

- (void) setLineSpacingTo: (int) newSpacing

{

    NSTextStorage               *storage;

    NSParagraphStyle            *ruler;

    NSMutableParagraphStyle     *mutableRuler;

    storage = [self textStorage];

    //  Avoid raising exceptions

    if ([storage length] == 0)

        return;

    ruler = [storage attribute: NSParagraphStyleAttributeName

                                atIndex: 0

                                effectiveRange: NULL];

    if (ruler == nil)

        ruler = [NSParagraphStyle defaultParagraphStyle];

    mutableRuler = [ruler mutableCopy];

    [mutableRuler setLineSpacing: newSpacing];

    [storage addAttribute: NSParagraphStyleAttributeName

                value:mutableRuler

                range: NSMakeRange (0, [storage length])];

}

@end

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