element-ios/Riot/Modules/Room/TimelineDecorations/ReadReceipts/MXKReceiptSendersContainer.m

/*
Copyright 2018-2024 New Vector Ltd.
Copyright 2015 OpenMarket Ltd

SPDX-License-Identifier: AGPL-3.0-only
Please see LICENSE in the repository root for full details.
 */

#import "MXKReceiptSendersContainer.h"

#import "MXKImageView.h"

static UIColor* kMoreLabelDefaultcolor;

@interface MXKReceiptSendersContainer ()

@property (nonatomic, readwrite) NSArray <MXRoomMember *> *roomMembers;
@property (nonatomic, readwrite) NSArray <UIImage *> *placeholders;
@property (nonatomic) MXMediaManager *mediaManager;

@end


@implementation MXKReceiptSendersContainer

+ (void)initialize
{
    if (self == [MXKReceiptSendersContainer class])
    {
        kMoreLabelDefaultcolor = [UIColor blackColor];
    }
}

- (instancetype)initWithFrame:(CGRect)frame andMediaManager:(MXMediaManager*)mediaManager
{
    self = [super initWithFrame:frame];
    if (self)
    {
        _mediaManager = mediaManager;
        _maxDisplayedAvatars = 3;
        _avatarMargin = 2.0;
        _moreLabel = nil;
        _moreLabelTextColor = kMoreLabelDefaultcolor;
    }
    return self;
}

- (void)refreshReceiptSenders:(NSArray<MXRoomMember*>*)roomMembers withPlaceHolders:(NSArray<UIImage*>*)placeHolders andAlignment:(ReadReceiptsAlignment)alignment
{
    // Store the room members and placeholders for showing in the details view controller
    self.roomMembers = roomMembers;
    self.placeholders = placeHolders;
    
    // Remove all previous content
    for (UIView* view in self.subviews)
    {
        [view removeFromSuperview];
    }
    if (_moreLabel)
    {
        [_moreLabel removeFromSuperview];
        _moreLabel = nil;
    }
    
    CGRect globalFrame = self.frame;
    CGFloat side = globalFrame.size.height;
    CGFloat defaultMoreLabelWidth = side < 20 ? 20 : side;
    unsigned long count;
    unsigned long maxDisplayableItems = (int)((globalFrame.size.width - defaultMoreLabelWidth - _avatarMargin) / (side + _avatarMargin));
    
    maxDisplayableItems = MIN(maxDisplayableItems, _maxDisplayedAvatars);
    count = MIN(roomMembers.count, maxDisplayableItems);
    
    int index;
    
    CGFloat xOff = 0;
    
    if (alignment == ReadReceiptAlignmentRight)
    {
        xOff = globalFrame.size.width - (side + _avatarMargin);
    }
    
    for (index = 0; index < count; index++)
    {
        MXRoomMember *roomMember = [roomMembers objectAtIndex:index];
        UIImage *preview = index < placeHolders.count ? placeHolders[index] : nil;
        
        MXKImageView *imageView = [[MXKImageView alloc] initWithFrame:CGRectMake(xOff, 0, side, side)];
        imageView.defaultBackgroundColor = [UIColor clearColor];
        imageView.autoresizingMask = UIViewAutoresizingNone;
        
        if (alignment == ReadReceiptAlignmentRight)
        {
            xOff -= side + _avatarMargin;
        }
        else
        {
            xOff += side + _avatarMargin;
        }
        
        [self addSubview:imageView];
        imageView.enableInMemoryCache = YES;
        
        [imageView setImageURI:roomMember.avatarUrl
                      withType:nil
           andImageOrientation:UIImageOrientationUp
                 toFitViewSize:CGSizeMake(side, side)
                    withMethod:MXThumbnailingMethodCrop
                  previewImage:preview
                  mediaManager:_mediaManager];
        
        [imageView.layer setCornerRadius:imageView.frame.size.width / 2];
        imageView.clipsToBounds = YES;
    }
    
    // Check whether there are more than expected read receipts
    if (roomMembers.count > maxDisplayableItems)
    {
        // Add a more indicator
        
        // In case of right alignment, adjust the current position by considering the default label width
        if (alignment == ReadReceiptAlignmentRight && side < defaultMoreLabelWidth)
        {
            xOff -= (defaultMoreLabelWidth - side);
        }
        
        _moreLabel = [[UILabel alloc] initWithFrame:CGRectMake(xOff, 0, defaultMoreLabelWidth, side)];
        _moreLabel.text = [NSString stringWithFormat:(alignment == ReadReceiptAlignmentRight) ? @"%tu+" : @"+%tu", roomMembers.count - maxDisplayableItems];
        _moreLabel.font = [UIFont systemFontOfSize:11];
        _moreLabel.adjustsFontSizeToFitWidth = YES;
        _moreLabel.minimumScaleFactor = 0.6;
        
        // In case of right alignment, adjust the horizontal position according to the actual label width
        if (alignment == ReadReceiptAlignmentRight)
        {
            [_moreLabel sizeToFit];
            CGRect frame = _moreLabel.frame;
            if (frame.size.width < defaultMoreLabelWidth)
            {
                frame.origin.x += (defaultMoreLabelWidth - frame.size.width);
                _moreLabel.frame = frame;
            }
        }
        
        _moreLabel.textColor = self.moreLabelTextColor ?: kMoreLabelDefaultcolor;
        [self addSubview:_moreLabel];
    }
}

- (void)dealloc
{
    NSArray* subviews = self.subviews;
    for (UIView* view in subviews)
    {
        [view removeFromSuperview];
    }
    
    if (_moreLabel)
    {
        [_moreLabel removeFromSuperview];
        _moreLabel = nil;
    }
}

@end