project_files/HedgewarsMobile/Classes/MNEValueTrackingSlider.m
author Wuzzy <almikes@aol.com>
Wed, 13 Apr 2016 00:39:45 +0200
changeset 11718 f699978eae19
parent 11549 893722a2a1f9
child 12872 00215a7ec5f5
permissions -rwxr-xr-x
Throw away old out-commented Construction Mode code
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//
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// MNEValueTrackingSlider
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//
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// Copyright 2012 Michael Neuwert
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// "You can use the code in your own project and modify it as you like."
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// http://blog.neuwert-media.com/2012/04/customized-uislider-with-visual-value-tracking/
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//
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#import "MNEValueTrackingSlider.h"
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#pragma mark -
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#pragma mark Private UIView subclass rendering the popup showing slider value
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@interface SliderValuePopupView : UIView
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@property (nonatomic, retain) UIFont *font;
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@property (nonatomic, copy) NSString *text;
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@property (nonatomic) float arrowOffset;
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@end
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@implementation SliderValuePopupView
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@synthesize font = _font;
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@synthesize text = _text;
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@synthesize arrowOffset = _arrowOffset;
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-(id) initWithFrame:(CGRect) frame {
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    self = [super initWithFrame:frame];
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    if (self) {
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        self.font = [UIFont boldSystemFontOfSize:18];
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    }
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    return self;
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}
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-(void) dealloc {
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    self.text = nil;
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    self.font = nil;
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    [super dealloc];
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}
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-(void) drawRect:(CGRect) rect {
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    // Create the path for the rounded rectangle
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    CGRect roundedRect = CGRectMake(self.bounds.origin.x, self.bounds.origin.y, self.bounds.size.width, floorf(self.bounds.size.height * 0.8));
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    UIBezierPath *roundedRectPath = [UIBezierPath bezierPathWithRoundedRect:roundedRect cornerRadius:6.0];
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    roundedRectPath.lineWidth = 2.0f;
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    // Create the arrow path
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    UIBezierPath *arrowPath = [UIBezierPath bezierPath];
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    /*
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    // Make sure the arrow offset is nice
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    if (-self.arrowOffset + 1 > CGRectGetMidX(self.bounds) / 2)
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        self.arrowOffset = -CGRectGetMidX(self.bounds) / 2 + 1;
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    if (self.arrowOffset > CGRectGetMidX(self.bounds) / 2)
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        self.arrowOffset = CGRectGetMidX(self.bounds) / 2 -1;
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     */
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    CGFloat midX = CGRectGetMidX(self.bounds) + self.arrowOffset;
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    CGPoint p0 = CGPointMake(midX, CGRectGetMaxY(self.bounds));
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    [arrowPath moveToPoint:p0];
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    [arrowPath addLineToPoint:CGPointMake((midX - 10.0), CGRectGetMaxY(roundedRect))];
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    [arrowPath addLineToPoint:CGPointMake((midX + 10.0), CGRectGetMaxY(roundedRect))];
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    [arrowPath closePath];
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    // Attach the arrow path to the rounded rect
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    [roundedRectPath appendPath:arrowPath];
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    // Color various sections
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    [[UIColor blackColor] setFill];
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    [roundedRectPath fill];
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    [[UIColor whiteColor] setStroke];
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    [roundedRectPath stroke];
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    [[UIColor whiteColor] setFill];
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    [arrowPath fill];
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    // Draw the text
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    if (self.text) {
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        [[UIColor lightYellowColor] set];
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        CGSize s = [_text sizeWithFont:self.font];
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        CGFloat yOffset = (roundedRect.size.height - s.height) / 2;
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        CGRect textRect = CGRectMake(roundedRect.origin.x, yOffset, roundedRect.size.width, s.height);
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        [_text drawInRect:textRect
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                 withFont:self.font
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            lineBreakMode:UILineBreakModeWordWrap
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                alignment:NSTextAlignmentCenter];
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    }
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}
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@end
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#pragma mark -
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#pragma mark MNEValueTrackingSlider implementations
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@implementation MNEValueTrackingSlider
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@synthesize thumbRect, textValue;
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#pragma mark Private methods
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-(void) _constructSlider {
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    valuePopupView = [[SliderValuePopupView alloc] initWithFrame:CGRectZero];
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    valuePopupView.backgroundColor = [UIColor clearColor];
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    valuePopupView.alpha = 0.0;
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    [self addSubview:valuePopupView];
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}
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-(void) _fadePopupViewInAndOut:(BOOL)aFadeIn {
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    [UIView beginAnimations:nil context:NULL];
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    [UIView setAnimationDuration:0.25];
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    if (aFadeIn) {
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        valuePopupView.alpha = 1.0;
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    } else {
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        valuePopupView.alpha = 0.0;
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    }
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    [UIView commitAnimations];
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}
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-(void) _positionAndUpdatePopupView {
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    CGRect _thumbRect = self.thumbRect;
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    CGRect popupRect = CGRectOffset(_thumbRect, 0, -floorf(_thumbRect.size.height * 1.5));
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    // (-100, -15) determines the size of the the rect
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    popupRect = CGRectInset(popupRect, -100, -15);
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    // this prevents drawing the popup outside the slider view
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    if (popupRect.origin.x < -self.frame.origin.x+5)
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        popupRect.origin.x = -self.frame.origin.x+5;
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    else if (popupRect.origin.x > self.superview.frame.size.width - popupRect.size.width - self.frame.origin.x - 5)
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        popupRect.origin.x = self.superview.frame.size.width - popupRect.size.width - self.frame.origin.x - 5;
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    //else if (CGRectGetMaxX(popupRect) > CGRectGetMaxX(self.superview.bounds))
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    //    popupRect.origin.x = CGRectGetMaxX(self.superview.bounds) - CGRectGetWidth(popupRect) - 1.0;
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    valuePopupView.arrowOffset = CGRectGetMidX(_thumbRect) - CGRectGetMidX(popupRect);
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    valuePopupView.frame = popupRect;
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    valuePopupView.text = self.textValue;
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    [valuePopupView setNeedsDisplay];
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}
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#pragma mark Memory management
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-(id) initWithFrame:(CGRect) frame {
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    self = [super initWithFrame:frame];
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    if (self) {
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        [self _constructSlider];
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    }
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    return self;
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}
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-(id) initWithCoder:(NSCoder *)aDecoder {
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    self = [super initWithCoder:aDecoder];
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    if (self) {
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        [self _constructSlider];
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    }
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    return self;
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}
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-(void) dealloc {
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    [valuePopupView release];
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    [textValue release];
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    [super dealloc];
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}
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#pragma mark -
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#pragma mark UIControl touch event tracking
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-(BOOL) beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
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    // Fade in and update the popup view
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    CGPoint touchPoint = [touch locationInView:self];
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    // Check if the knob is touched. Only in this case show the popup-view
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    if(CGRectContainsPoint(CGRectInset(self.thumbRect, -14.0, -12.0), touchPoint)) {
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        [self _positionAndUpdatePopupView];
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        [self _fadePopupViewInAndOut:YES];
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    }
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    return [super beginTrackingWithTouch:touch withEvent:event];
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}
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-(BOOL) continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
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    // Update the popup view as slider knob is being moved
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    [self _positionAndUpdatePopupView];
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    return [super continueTrackingWithTouch:touch withEvent:event];
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}
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-(void) cancelTrackingWithEvent:(UIEvent *)event {
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    [super cancelTrackingWithEvent:event];
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}
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-(void) endTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
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    // Fade out the popoup view
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    [self _fadePopupViewInAndOut:NO];
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    [super endTrackingWithTouch:touch withEvent:event];
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}
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#pragma mark -
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#pragma mark Custom property accessors
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-(CGRect) thumbRect {
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    CGRect trackRect = [self trackRectForBounds:self.bounds];
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    CGRect thumbR = [self thumbRectForBounds:self.bounds
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                                         trackRect:trackRect
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                                             value:self.value];
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    return thumbR;
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}
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@end