//

// I7CoreTextView.m

// CoreTextExample

//

// Created by Jonas Schnelli on 18.05.10.

// Copyright 2010 include7 AG. All rights reserved.

//

#import "I7CoreTextView.h"

#define PADDING_LEFT 10.0

#define PADDING_TOP 10.0

@implementation I7CoreTextView

@synthesize fontSize,height,textType;

- (void)awakeFromNib {

/* this will ensure that the layer will be redrawn when the user changes the autorotation */

CALayer *layer = self.layer;

[layer setNeedsDisplayOnBoundsChange:YES];

}

- (void)localInit {

[self loadMutableFonts];

fontSize = 24.0;

[self buildText];

[self calculateHeight];

}

- (void)calculateHeight {

/* this methode will get the text height and change the frame size of self (the view) */

CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString(attrString);

CFRange fitRange = CFRangeMake(0,0);

CGSize aSize = CTFramesetterSuggestFrameSizeWithConstraints(framesetter, CFRangeMake(0, CFStringGetLength((CFStringRef)attrString)), NULL, CGSizeMake(self.frame.size.width,CGFLOAT_MAX), &fitRange);

self.frame = CGRectMake(self.frame.origin.x,self.frame.origin.y,self.frame.size.width,aSize.height+PADDING_TOP+PADDING_TOP);

}

- (void)loadMutableFonts {

/* load all existing fonts */

CTFontCollectionRef collection = CTFontCollectionCreateFromAvailableFonts(NULL);

CFArrayRef fonts = CTFontCollectionCreateMatchingFontDescriptors(collection);

CFIndex count = CFArrayGetCount(fonts);

fontsMutable = CFArrayCreateMutable(kCFAllocatorDefault, count, NULL);

for (int i = 0; i < count; i++)

{

CTFontDescriptorRef desc = (CTFontDescriptorRef)CFArrayGetValueAtIndex(fonts, i);

CFStringRef fontName = CTFontDescriptorCopyAttribute(desc,kCTFontNameAttribute);

CFArrayAppendValue(fontsMutable, fontName);

CFRelease(fontName);

}

CFArraySortValues(fontsMutable, CFRangeMake(0, count), (CFComparatorFunction)CFStringCompare, NULL);

CFRelease(fonts);

}

- (void)buildText {

/* build the text */

if(attrString) {

CFRelease(attrString);

}

NSMutableString *mString;

attrString = CFAttributedStringCreateMutable(kCFAllocatorDefault, 0);

if(textType == I7CoreTextViewTextTypeFonts) {

attrString = CFAttributedStringCreateMutable(kCFAllocatorDefault, 0);

mString = [[NSMutableString alloc] init];

for (int i = 0; i < CFArrayGetCount(fontsMutable); i++)

{

CFStringRef fontName = CFArrayGetValueAtIndex(fontsMutable,i);

[mString appendString:(NSString *)fontName];

[mString appendString:@"\n"];

}

CFStringRef string = (CFStringRef)mString;

CFAttributedStringReplaceString (attrString, CFRangeMake(0, 0), string);

/* change every font text with the correspondending font */

for (int i = 0; i < CFArrayGetCount(fontsMutable); i++)

{

CFStringRef fontName = CFArrayGetValueAtIndex(fontsMutable,i);

CTFontRef myFont = CTFontCreateWithName((CFStringRef)fontName, fontSize, NULL);

CFRange range = CFStringFind((CFStringRef)mString, fontName, kCFCompareCaseInsensitive);

CFAttributedStringSetAttribute(attrString, range, kCTFontAttributeName, myFont);

}

}

else {

mString = [[NSString alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"sampleText" ofType:@"txt"]];

CFAttributedStringReplaceString (attrString, CFRangeMake(0, 0), (CFStringRef)mString);

CFStringRef fontName = (CFStringRef)@"Helvetica";

CTFontRef myFont = CTFontCreateWithName((CFStringRef)fontName, fontSize, NULL);

CFAttributedStringSetAttribute(attrString, CFRangeMake(0, CFStringGetLength((CFStringRef)mString)), kCTFontAttributeName, myFont);

/* set some dummy attributes */

CTFontRef myFont2 = CTFontCreateWithName((CFStringRef)@"Helvetica Bold", fontSize, NULL);

CTFontRef myFont3 = CTFontCreateWithName((CFStringRef)@"SnellRoundhand-Bold", fontSize*2, NULL);

CFRange range = CFStringFind((CFStringRef)mString, (CFStringRef)@"Lorem", kCFCompareCaseInsensitive);

CFAttributedStringSetAttribute(attrString, range, kCTFontAttributeName, myFont2);

CFRange range2 = CFStringFind((CFStringRef)mString, (CFStringRef)@"dolor", kCFCompareCaseInsensitive);

CFAttributedStringSetAttribute(attrString, range2, kCTFontAttributeName, myFont3);

CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();

CGFloat components[] = { 1.0, 0.3, 0.3, 0.8 };

CGColorRef red = CGColorCreate(rgbColorSpace, components);

CGColorSpaceRelease(rgbColorSpace);

CFAttributedStringSetAttribute(attrString, range2,

kCTForegroundColorAttributeName, red);

CFRelease(red);

}

[mString release];

CTTextAlignment alignment = kCTLeftTextAlignment;

CTParagraphStyleSetting settings[] = {

{kCTParagraphStyleSpecifierAlignment, sizeof(alignment), &alignment}

};

CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(settings, sizeof(settings) / sizeof(settings[0]));

CFAttributedStringSetAttribute(attrString, CFRangeMake(0, CFStringGetLength((CFStringRef)attrString)), kCTParagraphStyleAttributeName, paragraphStyle);

}

- (void) drawRect:(CGRect)rect {

/* draw it */

if(!fontsMutable) {

/* if no fonts loaded, cancel! */

return;

}

if(!attrString) {

[self buildText];

}

/* get the context */

CGContextRef context = UIGraphicsGetCurrentContext();

/* flip the coordinate system */

float viewHeight = self.bounds.size.height;

CGContextTranslateCTM(context, 0, viewHeight);

CGContextScaleCTM(context, 1.0, -1.0);

CGContextSetTextMatrix(context, CGAffineTransformMakeScale(1.0, 1.0));

/* generate the path for the text */

CGMutablePathRef path = CGPathCreateMutable();

CGRect bounds = CGRectMake(PADDING_LEFT, -PADDING_TOP, self.bounds.size.width-20.0, self.bounds.size.height);

CGPathAddRect(path, NULL, bounds);

/* draw the text */

CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString(attrString);

CTFrameRef frame = CTFramesetterCreateFrame(framesetter,

CFRangeMake(0, 0), path, NULL);

CFRelease(framesetter);

CFRelease(path);

CTFrameDraw(frame, context);

}

@end