darling-cocotron/AppKit/NSStringDrawer.m

/* Copyright (c) 2006-2007 Christopher J. W. Lloyd <cjwl@objc.net>
                 2009 Markus Hitter <mah@jump-ing.de>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */

#import <AppKit/NSStringDrawer.h>
#import <AppKit/NSTextStorage.h>
#import <AppKit/NSLayoutManager.h>
#import <AppKit/NSTextContainer.h>
#import <AppKit/NSStringDrawing.h>
#import <AppKit/NSView.h>
#import <AppKit/NSGraphicsContextFunctions.h>
#import <ApplicationServices/ApplicationServices.h>

const float NSStringDrawerLargeDimension=1000000.;

@implementation NSStringDrawer

+(NSStringDrawer *)sharedStringDrawer {
   return NSThreadSharedInstance(@"NSStringDrawer");
}

-(NSStringDrawer *)init {
   self=[super init];
   if (self!=nil) {
    _textStorage=[NSTextStorage new];
    _layoutManager=[NSLayoutManager new];
    _textContainer=[[NSTextContainer alloc] init];
    [_textStorage addLayoutManager:_layoutManager];
    [_layoutManager addTextContainer:_textContainer];
   }
   return self;
}

-(NSSize)sizeOfString:(NSString *)string withAttributes:(NSDictionary *)attributes  inSize:(NSSize)maxSize {
   if(maxSize.width==NSZeroSize.width && maxSize.height==NSZeroSize.height)
    maxSize=NSMakeSize(NSStringDrawerLargeDimension,NSStringDrawerLargeDimension);
   [_textContainer setContainerSize:maxSize];
   [_textStorage beginEditing];
   [_textStorage replaceCharactersInRange:NSMakeRange(0,[_textStorage length]) withString:string];
   [_textStorage setAttributes:attributes range:NSMakeRange(0,[_textStorage length])];
   [_textStorage endEditing];
   return [_layoutManager usedRectForTextContainer:_textContainer].size;
}

-(void)drawString:(NSString *)string withAttributes:(NSDictionary *)attributes inRect:(NSRect)rect {
   NSRange glyphRange;

   [_textContainer setContainerSize:rect.size];
   [_textStorage beginEditing];
   [_textStorage replaceCharactersInRange:NSMakeRange(0,[_textStorage length]) withString:string];
   [_textStorage setAttributes:attributes range:NSMakeRange(0,[_textStorage length])];
   [_textStorage endEditing];

   glyphRange=[_layoutManager glyphRangeForTextContainer:_textContainer];
    
   [_layoutManager drawBackgroundForGlyphRange:glyphRange atPoint:rect.origin];
   [_layoutManager drawGlyphsForGlyphRange:glyphRange atPoint:rect.origin];
}

-(void)drawString:(NSString *)string withAttributes:(NSDictionary *)attributes atPoint:(NSPoint)point inSize:(NSSize)maxSize {
   NSRange glyphRange;

   if(maxSize.width==NSZeroSize.width && maxSize.height==NSZeroSize.height)
    maxSize=NSMakeSize(NSStringDrawerLargeDimension,NSStringDrawerLargeDimension);
   [_textContainer setContainerSize:maxSize];
   [_textStorage beginEditing];
   [_textStorage replaceCharactersInRange:NSMakeRange(0,[_textStorage length]) withString:string];
   [_textStorage setAttributes:attributes range:NSMakeRange(0,[_textStorage length])];
   [_textStorage endEditing];

   glyphRange=[_layoutManager glyphRangeForTextContainer:_textContainer];
   [_layoutManager drawBackgroundForGlyphRange:glyphRange atPoint:point];
   [_layoutManager drawGlyphsForGlyphRange:glyphRange atPoint:point];
}

-(NSSize)sizeOfAttributedString:(NSAttributedString *)astring inSize:(NSSize)maxSize {
   if(maxSize.width==NSZeroSize.width && maxSize.height==NSZeroSize.height)
    maxSize=NSMakeSize(NSStringDrawerLargeDimension,NSStringDrawerLargeDimension);
   [_textContainer setContainerSize:maxSize];
   [_textStorage setAttributedString:astring];
   return [_layoutManager usedRectForTextContainer:_textContainer].size;
}

-(void)drawAttributedString:(NSAttributedString *)astring inRect:(NSRect)rect {
   NSRange glyphRange;

   [_textContainer setContainerSize:rect.size];
   [_textStorage setAttributedString:astring];

   glyphRange=[_layoutManager glyphRangeForTextContainer:_textContainer];
   [_layoutManager drawBackgroundForGlyphRange:glyphRange atPoint:rect.origin];
   [_layoutManager drawGlyphsForGlyphRange:glyphRange atPoint:rect.origin];
}

-(void)drawAttributedString:(NSAttributedString *)astring atPoint:(NSPoint)point inSize:(NSSize)maxSize {
   NSRange glyphRange;

   if(maxSize.width==NSZeroSize.width && maxSize.height==NSZeroSize.height)
    maxSize=NSMakeSize(NSStringDrawerLargeDimension,NSStringDrawerLargeDimension);
   [_textContainer setContainerSize:maxSize];
   [_textStorage setAttributedString:astring];

   glyphRange=[_layoutManager glyphRangeForTextContainer:_textContainer];
   [_layoutManager drawBackgroundForGlyphRange:glyphRange atPoint:point];
   [_layoutManager drawGlyphsForGlyphRange:glyphRange atPoint:point];
}

@end

@implementation NSString(NSStringDrawer)

- (void)_clipAndDrawInRect:(NSRect)rect withAttributes:(NSDictionary *)attributes truncatingTail:(BOOL)truncateTail
{
	NSAttributedString *string = [[[NSAttributedString alloc] initWithString:self attributes:attributes] autorelease];
	[string _clipAndDrawInRect:rect truncatingTail: truncateTail];
}

// Draw self in the rect, clipped - add ellipsis if needed 
-(void)_clipAndDrawInRect:(NSRect)rect withAttributes:(NSDictionary *)attributes {
	[self _clipAndDrawInRect: rect withAttributes: attributes truncatingTail: YES];
}

@end

@implementation NSAttributedString(NSStringDrawer)

// Draw self in the rect, clipped - add ellipsis if needed 
-(void)_clipAndDrawInRect:(NSRect)rect truncatingTail:(BOOL)truncateTail
{
   CGContextRef graphicsPort=NSCurrentGraphicsPort();
   CGContextSaveGState(graphicsPort);
   CGContextClipToRect(graphicsPort,rect);
	
	// In a perfect world, we could use the NSLineBreakByTruncatingTail attribute, but that's not supported for now
	// by Cocotron
	NSAttributedString *string = self; 
	NSSize size = [string size];
	if (truncateTail && size.width > rect.size.width && [string length]) {
		// Create a "..." attributed string with the attributes of the last char of this string
		NSDictionary *attributes = [string attributesAtIndex:[string length]-1 effectiveRange:NULL];
		NSAttributedString *ellipsis = [[[NSAttributedString alloc] initWithString:@"..." attributes:attributes] autorelease];
		NSAttributedString *clippedTitle = string;
		do {
			clippedTitle = [clippedTitle attributedSubstringFromRange:NSMakeRange(0,[clippedTitle length]-1)];
			NSMutableAttributedString *tmpString = [[clippedTitle mutableCopy] autorelease];
			[tmpString appendAttributedString:ellipsis];
			string = tmpString;
			size = [string size];
		} while ([clippedTitle length] && size.width > rect.size.width);
	}
	[[NSStringDrawer sharedStringDrawer] drawAttributedString:string inRect:rect];
   CGContextRestoreGState(graphicsPort);
}

-(void)_clipAndDrawInRect:(NSRect)rect
{
	[self _clipAndDrawInRect: rect truncatingTail: YES];
}

@end