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SKSegmentedControl.m
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SKSegmentedControl.m
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//
// SKSegmentedControl.m
//
// Created by Raheel Ahmad on 11/6/11.
// Copyright (c) 2011 Sakun Labs. All rights reserved.
//
#import "SKSegmentedControl.h"
#import "SSLineView.h"
// -- private parts
@interface SKSegmentedControl ()
@property (nonatomic) CTFontRef ctSmallFont;
@property (nonatomic) CTFontRef ctLargeFont;
@property (nonatomic, strong) UIFont *smallFont;
@property (nonatomic, strong) UIFont *largeFont;
@property (nonatomic, strong) SSLineView *selectionLineView;
@property (nonatomic, retain) NSMutableArray *separators;
- (UIImageView *) separatorAt: (int) xPosition;
- (CGSize) sizeForString:(NSString *) aString;
- (void) makeLayerSelected: (CATextLayer *) aLayer;
- (void) makeLayerUnselected: (CATextLayer *) aLayer;
- (BOOL) horizontalOrientation;
- (void) setupLabels;
- (void) setupSeparators;
@end
// --
@implementation SKSegmentedControl
@synthesize separators;
@synthesize separatorType;
@synthesize itemLabels;
@synthesize selectedIndex;
@synthesize ctSmallFont;
@synthesize ctLargeFont;
@synthesize smallFont;
@synthesize largeFont;
@synthesize selectionLineView;
@synthesize itemTitles;
@synthesize inactiveFontSize;
@synthesize activeFontSize;
@synthesize activeLabelColor;
@synthesize inactiveLabelColor;
@synthesize selectionLineThickness;
#pragma mark - Event handlers
- (void) selectAtIndex: (int) newIndex {
float w = 0;
float h = 0;
if ([self horizontalOrientation]) { // horizontal orientation
w = self.frame.size.width / [itemTitles count];
h = self.frame.size.height;
} else {
w = self.frame.size.width;
h = self.frame.size.height / [itemTitles count];
}
// if proper newIndex, make it selected
if (newIndex >= 0 && newIndex < [itemLabels count]) {
CATextLayer *newSelectedLayer = [itemLabels objectAtIndex:newIndex];
CGSize stringSize = [self sizeForString:newSelectedLayer.string];
float txtHeight = stringSize.height;
CGRect newFrame;
CGRect lineViewFrame;
if ([self horizontalOrientation]) {
newFrame = CGRectMake(newIndex * w, h/2 - txtHeight/2, w, txtHeight);
lineViewFrame = CGRectMake(newIndex * w + w/2 - stringSize.width/2, h/2 + txtHeight/2, stringSize.width, self.selectionLineThickness);
}
else {
newFrame = CGRectMake(0, h * newIndex + txtHeight/2, w, txtHeight);
lineViewFrame = CGRectMake(w - stringSize.width, h * (newIndex+1) - h/2 + txtHeight/2, stringSize.width, self.selectionLineThickness);
}
// set up line view if not available
if (!self.selectionLineView) {
self.selectionLineView = [[SSLineView alloc] initWithFrame:lineViewFrame];
self.selectionLineView.lineColor = self.activeLabelColor;
self.selectionLineView.insetColor = [UIColor colorWithRed:0.474 green:0.567 blue:0.894 alpha:1.000];
[self.selectionLineView setShowInset:YES];
}
if (!self.selectionLineView.superview)
[self addSubview:self.selectionLineView];
// animate the selection
[UIView animateWithDuration:0.3f delay:0.0f options:(UIViewAnimationOptionCurveEaseInOut) animations:^{
newSelectedLayer.frame = newFrame;
[self makeLayerSelected:newSelectedLayer];
self.selectionLineView.frame = lineViewFrame;
} completion:^(BOOL finished) {
}];
// if there was a previous selectedIndex, let's make it unselected
if (newIndex != selectedIndex && selectedIndex >= 0 && selectedIndex < [itemTitles count]) {
CATextLayer *oldSelectedLayer = [itemLabels objectAtIndex:selectedIndex];
[self makeLayerUnselected:oldSelectedLayer];
}
selectedIndex = newIndex;
}
}
#pragma mark - UIControl
- (BOOL) beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
return YES;
}
- (BOOL) continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
return YES;
}
- (void) endTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
CGPoint pointAtUp = [touch locationInView:self];
int indexAtUp = -1;
if ([self horizontalOrientation])
indexAtUp = pointAtUp.x / (self.frame.size.width / [itemTitles count]);
else
indexAtUp = pointAtUp.y / (self.frame.size.height / [itemTitles count]);
[self selectAtIndex:indexAtUp];
[self sendActionsForControlEvents:UIControlEventValueChanged];
}
#pragma mark - Helpers
- (BOOL) horizontalOrientation {
return (self.frame.size.width > self.frame.size.height);
}
- (UIImageView *) separatorAt: (int) xPosition {
UIImageView *imgVw = nil;
if (separatorType == SKSegItemSeparatorTypeBullet) {
imgVw = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"bulletSeparator.png"]];
float h = self.frame.size.height;
imgVw.frame = CGRectMake(xPosition - 2, h/2 - 2, 6, 6);
}
else if (separatorType == SKSegItemSeparatorTypeLine) {
imgVw = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"lineSeparator.png"]];
float h = self.frame.size.height;
imgVw.frame = CGRectMake(xPosition - 1, h/2 - h/6, 2, h/3);
}
return imgVw;
}
- (void) makeLayerSelected:(CATextLayer *)aLayer {
aLayer.shadowColor = [UIColor colorWithWhite:0.2f alpha:0.7f].CGColor;
aLayer.shadowOffset = CGSizeMake(0, 1);
aLayer.shadowOpacity = 1.0f;
aLayer.fontSize = self.activeFontSize;
aLayer.font = self.ctLargeFont;
aLayer.foregroundColor = self.activeLabelColor.CGColor;
aLayer.shadowRadius = 1.0f;
}
- (void) makeLayerUnselected:(CATextLayer *)aLayer {
aLayer.shadowOpacity = 1.0f;
aLayer.shadowOffset = CGSizeMake(0.0f, 1.0f);
aLayer.shadowColor = [UIColor colorWithWhite:0.9f alpha:1.0f].CGColor;
aLayer.shadowRadius = 0.0f;
aLayer.font = self.ctSmallFont;
aLayer.fontSize = self.inactiveFontSize;
aLayer.foregroundColor = self.inactiveLabelColor.CGColor;
}
// always returns size considering the big font size
- (CGSize) sizeForString:(NSString *) aString {
float w = 0;
float h = 0;
if ([self horizontalOrientation]) {
w = self.frame.size.width/[itemTitles count];
h = self.frame.size.height;
}
else {
w = self.frame.size.width;
h = self.frame.size.height/[itemTitles count];
}
return [aString sizeWithFont:largeFont constrainedToSize:CGSizeMake(w, h)];
}
- (void) setupLabels {
if (!IsEmpty(itemLabels)) // get rid of previous ones if any
for (CATextLayer *aLayer in itemLabels) {
[aLayer removeFromSuperlayer];
}
self.itemLabels = [NSMutableArray arrayWithCapacity:[self.itemTitles count]];
float w = 0;
float h = 0;
if ([self horizontalOrientation]) { // if horizontal orientation
w = self.frame.size.width / [itemTitles count];
h = self.frame.size.height;
}
else {
w = self.frame.size.width;
h = self.frame.size.height / [itemTitles count];
}
for (int i=0; i < [itemTitles count]; i++) {
NSString *anItem = [itemTitles objectAtIndex:i];
CATextLayer *alayer = [[CATextLayer alloc] init];
alayer.backgroundColor = [UIColor clearColor].CGColor;
[alayer setString:anItem];
[alayer setForegroundColor:self.inactiveLabelColor.CGColor];
[alayer setContentsScale:[[UIScreen mainScreen] scale]];
[alayer setFont:ctSmallFont];
[alayer setFontSize:self.inactiveFontSize];
CGRect layerFrame;
if ([self horizontalOrientation]) { // if horizontal orientation
layerFrame.origin.x = w * i;
layerFrame.size.width = w;
float textHeight = [self sizeForString:anItem].height;
layerFrame.origin.y = h/2 - textHeight/2;
layerFrame.size.height = textHeight;
}
else {
layerFrame.origin.x = 0;
layerFrame.size.width = w;
float textHeight = [self sizeForString:anItem].height;
layerFrame.origin.y = h * i + textHeight/2;
layerFrame.size.height = textHeight;
}
[alayer setFrame:layerFrame];
if ([self horizontalOrientation])
[alayer setAlignmentMode:kCAAlignmentCenter];
else
[alayer setAlignmentMode:kCAAlignmentRight];
[self makeLayerUnselected:alayer];
[[self layer] addSublayer:alayer];
[itemLabels addObject:alayer];
}
}
- (void) setupSeparators {
if (!IsEmpty(self.separators)) {
for (UIImageView *separator in separators) {
[separator removeFromSuperview];
}
}
self.separators = [NSMutableArray arrayWithCapacity:[itemTitles count]-1];
float w = 0;
if ([self horizontalOrientation]) // if horizontal orientation
w = self.frame.size.width / [itemTitles count];
else
w = self.frame.size.width;
if ([self horizontalOrientation]) { // if horizontal orientation
for (int i = 0; i < [itemTitles count]; i++) {
if (i < [itemTitles count] - 1) {
UIImageView *separator = [self separatorAt:(w * (i + 1))];
[self addSubview:separator];
[self.separators addObject:separator];
}
}
}
}
#pragma mark - Setters
- (void) setSelectionLineThickness:(int) newThickness {
selectionLineThickness = newThickness;
[self selectAtIndex:selectedIndex];
}
- (void) setInactiveFontSize:(int) aSize {
inactiveFontSize = aSize;
self.ctSmallFont = CTFontCreateWithName((__bridge CFStringRef) @"HelveticaNeue-Bold", aSize, NULL);
self.smallFont = [UIFont boldSystemFontOfSize:aSize];
[self setupLabels];
[self selectAtIndex:selectedIndex];
}
- (void) setActiveFontSize:(int) aSize {
activeFontSize = aSize;
self.ctLargeFont = CTFontCreateWithName((__bridge CFStringRef) @"HelveticaNeue-Bold", aSize, NULL);
self.largeFont = [UIFont boldSystemFontOfSize:aSize];
[self setupLabels];
[self selectAtIndex:selectedIndex];
}
- (void) setSeparatorType:(SKSegItemSeparatorType) newSeparatorType {
separatorType = newSeparatorType;
[self setupSeparators];
}
- (void) setActiveLabelColor:(UIColor *) aColor {
activeLabelColor = aColor;
if (selectedIndex < 0 || selectedIndex >= [itemLabels count])
return;
CATextLayer *aLayer = [itemLabels objectAtIndex:selectedIndex];
[aLayer setForegroundColor:aColor.CGColor];
}
- (void) setInactiveLabelColor:(UIColor *) aColor {
inactiveLabelColor = aColor;
for (int i=0; i < [itemLabels count]; i++) {
if (i == selectedIndex)
continue;
CATextLayer *aLayer = [itemLabels objectAtIndex:i];
[aLayer setForegroundColor:aColor.CGColor];
}
}
#pragma mark - UIView
- (id) initWithFrame:(CGRect)frame andItems: (NSArray *) itms {
self = [super initWithFrame:frame];
if (self) {
self.activeFontSize = 18; // default font sizes
self.inactiveFontSize = 17;
self.selectionLineThickness = 6;
self.activeLabelColor = [UIColor colorWithWhite:0.254 alpha:1.000];
self.inactiveLabelColor = [UIColor grayColor];
self.backgroundColor = [UIColor clearColor];
self.itemTitles = itms;
self.separatorType = SKSegItemSeparatorTypeLine;
[self setupLabels];
[self selectAtIndex:0];
}
return self;
}
@end