BALabel.m

/*
 Copyright 2011 Dmitry Stadnik. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification, are
 permitted provided that the following conditions are met:
 
 1. Redistributions of source code must retain the above copyright notice, this list of
 conditions and the following disclaimer.
 
 2. Redistributions in binary form must reproduce the above copyright notice, this list
 of conditions and the following disclaimer in the documentation and/or other materials
 provided with the distribution.
 
 THIS SOFTWARE IS PROVIDED BY DMITRY STADNIK ``AS IS'' AND ANY EXPRESS OR IMPLIED
 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DMITRY STADNIK OR
 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 The views and conclusions contained in the software and documentation are those of the
 authors and should not be interpreted as representing official policies, either expressed
 or implied, of Dmitry Stadnik.
 */

#import "BALabel.h"

CGPathRef CGPathCreateRoundBezel(CGRect bounds, CGFloat lineWidth);

CGPathRef CGPathCreateRoundBezel(CGRect bounds, CGFloat lineWidth) {
	CGRect b = CGRectInset(bounds, lineWidth, lineWidth);
	const CGFloat w = b.size.width;
	const CGFloat h = b.size.height;
	if (w <= h) {
		UIBezierPath *bpath = [UIBezierPath bezierPathWithOvalInRect:b];
		CGPathRef path = bpath.CGPath;
		CGPathRetain(path);
		return path;
	}
	const CGFloat x = b.origin.x;
	const CGFloat y = b.origin.y;
	CGMutablePathRef path = CGPathCreateMutable();
	const CGFloat r = h / 2;
	CGPathMoveToPoint(path, NULL, x + r, y);
	CGPathAddLineToPoint(path, NULL, x + w - r, y);
	CGPathAddArc(path, NULL, x + w - r, y + r, r, -M_PI_2, M_PI_2, NO);
	CGPathAddLineToPoint(path, NULL, x + r, y + h);
	CGPathAddArc(path, NULL, x + r, y + r, r, M_PI_2, -M_PI_2, NO);
	return path;
}

@implementation BALabel {
@private
	UIEdgeInsets _textInsets;
	BAVerticalAlignment _verticalAlignment;
	BALabelBezel _bezel;
	CGFloat _bezelLineWidth;
	UIColor *_bezelColor;
	
	CGFloat _fitMaxWidth;
	CGFloat _fitMaxHeight;
	int _fit;
}

- (void)dealloc {
	[_bezelColor release];
	[super dealloc];
}

- (UIEdgeInsets)textInsets {
	return _textInsets;
}

- (void)setTextInsets:(UIEdgeInsets)textInsets {
	if (UIEdgeInsetsEqualToEdgeInsets(_textInsets, textInsets)) {
		return;
	}
	_textInsets = textInsets;
	[self setNeedsDisplay];
}

- (BAVerticalAlignment)verticalAlignment {
	return _verticalAlignment;
}

- (void)setVerticalAlignment:(BAVerticalAlignment)verticalAlignment {
	if (_verticalAlignment == verticalAlignment) {
		return;
	}
	_verticalAlignment = verticalAlignment;
	[self setNeedsDisplay];
}

- (BALabelBezel)bezel {
	return _bezel;
}

- (void)setBezel:(BALabelBezel)bezel {
	if (_bezel == bezel) {
		return;
	}
	_bezel = bezel;
	[self setNeedsDisplay];
}

- (CGFloat)bezelLineWidth {
	return _bezelLineWidth;
}

- (void)setBezelLineWidth:(CGFloat)bezelLineWidth {
	if (_bezelLineWidth == bezelLineWidth) {
		return;
	}
	_bezelLineWidth = bezelLineWidth;
	[self setNeedsDisplay];
}

- (UIColor *)bezelColor {
	return _bezelColor;
}

- (void)setBezelColor:(UIColor *)bezelColor {
	if (_bezelColor == bezelColor) {
		return;
	}
	[_bezelColor release];
	_bezelColor = [bezelColor retain];
	[self setNeedsDisplay];
}

- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines {
	CGRect r = bounds;
	if (_fit > 0) {
		r.size.width = _fitMaxWidth;
		r.size.height = _fitMaxHeight;
	}
	const CGFloat wd = self.textInsets.left + self.textInsets.right;
	const CGFloat hd = self.textInsets.top + self.textInsets.bottom;
	r.size.width -= wd;
	r.size.height -= hd;
	r = [super textRectForBounds:r limitedToNumberOfLines:numberOfLines];
	r.size.width += wd;
	r.size.height += hd;
	return r;
}

- (void)drawTextInRect:(CGRect)rect {
	CGRect tr = [self textRectForBounds:self.bounds limitedToNumberOfLines:self.numberOfLines];
	const CGFloat hd = self.bounds.size.height - tr.size.height;
	if (self.verticalAlignment == BAVerticalAlignmentCenter) {
		tr.origin.y += rint(hd / 2);
	} else if (self.verticalAlignment == BAVerticalAlignmentBottom) {
		tr.origin.y += rint(hd);
	}
	tr = UIEdgeInsetsInsetRect(tr, self.textInsets);
	[super drawTextInRect:tr];
}

- (void)drawBezel {
	switch (self.bezel) {
		case BALabelBezelNone:
			break;
		case BALabelBezelRound: {
			CGContextRef ctx = UIGraphicsGetCurrentContext();
			CGContextSaveGState(ctx);
			CGContextSetLineWidth(ctx, MAX(1, self.bezelLineWidth));
			if (self.bezelColor) {
				[self.bezelColor setStroke];
			}
			CGPathRef path = CGPathCreateRoundBezel(self.bounds, self.bezelLineWidth);
			CGContextAddPath(ctx, path);
			CGPathRelease(path);
			CGContextStrokePath(ctx);
			CGContextRestoreGState(ctx);
			break;
		}
		case BALabelBezelRoundSolid: {
			CGContextRef ctx = UIGraphicsGetCurrentContext();
			CGContextSaveGState(ctx);
			if (self.bezelColor) {
				[self.bezelColor setFill];
			}
			CGPathRef path = CGPathCreateRoundBezel(self.bounds, self.bezelLineWidth);
			CGContextAddPath(ctx, path);
			CGPathRelease(path);
			CGContextFillPath(ctx);
			CGContextRestoreGState(ctx);
			break;
		}
	}
}

- (void)drawRect:(CGRect)rect {
	[self drawBezel];
	[super drawRect:rect];
}

- (void)sizeToFitInWidth {
	[self sizeToFitInWidthMaxHeight:CGFLOAT_MAX];
}

- (void)sizeToFitInWidthMaxHeight:(CGFloat)maxHeight {
	const CGFloat w = self.bounds.size.width;

	_fit++;
	_fitMaxWidth = w;
	_fitMaxHeight = maxHeight;
	
	CGSize s = [self sizeThatFits:CGSizeMake(w, maxHeight)];
	
	_fit--;
	
	CGRect frame = self.frame;
	frame.size.height = s.height;
	self.frame = frame;
}

@end