session-ios/Session/Conversations/Settings/OWSMessageTimerView.m

//
//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
//

#import "OWSMessageTimerView.h"
#import "OWSMath.h"
#import "UIView+OWS.h"
#import <QuartzCore/QuartzCore.h>
#import <SignalCoreKit/OWSAsserts.h>
#import <SignalCoreKit/NSDate+OWS.h>
#import <SessionUtilitiesKit/NSTimer+Proxying.h>
#import <SessionSnodeKit/SessionSnodeKit.h>

NS_ASSUME_NONNULL_BEGIN

const CGFloat kDisappearingMessageIconSize = 12.f;

@interface OWSMessageTimerView ()

@property (nonatomic) uint32_t initialDurationSeconds;
@property (nonatomic) uint64_t expirationTimestamp;

@property (nonatomic, nullable) NSTimer *animationTimer;

// 0 == about to expire, 12 == just started countdown.
@property (nonatomic) NSInteger progress12;


@end

#pragma mark -

@implementation OWSMessageTimerView

- (void)dealloc
{
    [self clearAnimation];
}

- (instancetype)init
{
    self = [super initWithFrame:CGRectZero];
    if (!self) {
        return self;
    }

    [self commonInit];

    return self;
}

- (void)commonInit
{
    self.imageView = [UIImageView new];
    [self addSubview:self.imageView];
    [self.imageView ows_autoPinToSuperviewEdges];
    [self.imageView autoSetDimension:ALDimensionWidth toSize:kDisappearingMessageIconSize];
    [self.imageView autoSetDimension:ALDimensionHeight toSize:kDisappearingMessageIconSize];
}

- (void)configureWithExpirationTimestamp:(uint64_t)expirationTimestamp
                  initialDurationSeconds:(uint32_t)initialDurationSeconds
{
    self.expirationTimestamp = expirationTimestamp;
    self.initialDurationSeconds = initialDurationSeconds;

    [self updateProgress12];
    [self updateIcon];
    [self startAnimation];
}

- (void)updateProgress12
{
    BOOL hasStartedCountdown = self.expirationTimestamp > 0;
    if (!hasStartedCountdown) {
        self.progress12 = 12;
        return;
    }

    uint64_t nowTimestamp = [SNSnodeAPI currentOffsetTimestampMs];
    CGFloat secondsLeft
        = (self.expirationTimestamp > nowTimestamp ? (self.expirationTimestamp - nowTimestamp) / 1000.f : 0.f);
    CGFloat progress = 0.f;
    if (self.initialDurationSeconds > 0) {
        progress = CGFloatClamp(secondsLeft / self.initialDurationSeconds, 0.f, 1.f);
    }
    OWSAssertDebug(progress >= 0.f);
    OWSAssertDebug(progress <= 1.f);

    self.progress12 = (NSInteger)round(CGFloatClamp(progress, 0.f, 1.f) * 12);
}

- (void)setProgress12:(NSInteger)progress12
{
    if (_progress12 == progress12) {
        return;
    }
    _progress12 = progress12;

    [self updateIcon];
}

- (void)updateIcon
{
    self.imageView.image = [[self progressIcon] imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
}

- (UIImage *)progressIcon
{
    OWSAssertDebug(self.progress12 >= 0);
    OWSAssertDebug(self.progress12 <= 12);

    UIImage *_Nullable image;
    switch (self.progress12) {
        default:
        case 0:
            image = [UIImage imageNamed:@"disappearing_message_00"];
            break;
        case 1:
            image = [UIImage imageNamed:@"disappearing_message_05"];
            break;
        case 2:
            image = [UIImage imageNamed:@"disappearing_message_10"];
            break;
        case 3:
            image = [UIImage imageNamed:@"disappearing_message_15"];
            break;
        case 4:
            image = [UIImage imageNamed:@"disappearing_message_20"];
            break;
        case 5:
            image = [UIImage imageNamed:@"disappearing_message_25"];
            break;
        case 6:
            image = [UIImage imageNamed:@"disappearing_message_30"];
            break;
        case 7:
            image = [UIImage imageNamed:@"disappearing_message_35"];
            break;
        case 8:
            image = [UIImage imageNamed:@"disappearing_message_40"];
            break;
        case 9:
            image = [UIImage imageNamed:@"disappearing_message_45"];
            break;
        case 10:
            image = [UIImage imageNamed:@"disappearing_message_50"];
            break;
        case 11:
            image = [UIImage imageNamed:@"disappearing_message_55"];
            break;
        case 12:
            image = [UIImage imageNamed:@"disappearing_message_60"];
            break;
    }
    OWSAssertDebug(image);
    OWSAssertDebug(image.size.width == kDisappearingMessageIconSize);
    OWSAssertDebug(image.size.height == kDisappearingMessageIconSize);
    return image;
}

- (void)startAnimation
{
    [self clearAnimation];

    self.animationTimer = [NSTimer weakScheduledTimerWithTimeInterval:0.1f
                                                               target:self
                                                             selector:@selector(updateProgress12)
                                                             userInfo:nil
                                                              repeats:YES];
}

- (void)clearAnimation
{
    [self.animationTimer invalidate];
    self.animationTimer = nil;
}

- (void)prepareForReuse
{
    [self clearAnimation];
}

+ (CGSize)measureSize
{
    return CGSizeMake(kDisappearingMessageIconSize, kDisappearingMessageIconSize);
}

@end

NS_ASSUME_NONNULL_END