element-ios/Vector/Categories/MXKRoomBubbleTableViewCell+Vector.m

/*
 Copyright 2015 OpenMarket Ltd
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
 
 http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */

#import "MXKRoomBubbleTableViewCell+Vector.h"

#import "RoomBubbleCellData.h"

#import "VectorDesignValues.h"

#import <objc/runtime.h>

@implementation MXKRoomBubbleTableViewCell (Vector)

- (void)addTimestampLabelForComponent:(NSUInteger)componentIndex
{
    self.bubbleInfoContainer.hidden = NO;
    
    MXKRoomBubbleComponent *component;
    if (componentIndex < self.bubbleData.bubbleComponents.count)
    {
        component  = self.bubbleData.bubbleComponents[componentIndex];
    }
    
    if (component && component.date)
    {
        UILabel *dateTimeLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, component.position.y, self.bubbleInfoContainer.frame.size.width , 18)];
        
        dateTimeLabel.text = [self.bubbleData.eventFormatter timeStringFromDate:component.date];
        dateTimeLabel.textAlignment = NSTextAlignmentRight;
        dateTimeLabel.textColor = VECTOR_TEXT_GRAY_COLOR;
        if ([UIFont respondsToSelector:@selector(systemFontOfSize:weight:)])
        {
             dateTimeLabel.font = [UIFont systemFontOfSize:15 weight:UIFontWeightMedium];
        }
        else
        {
             dateTimeLabel.font = [UIFont systemFontOfSize:15];
        }
        dateTimeLabel.adjustsFontSizeToFitWidth = YES;

        dateTimeLabel.tag = componentIndex;
        
        [dateTimeLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
        [self.bubbleInfoContainer addSubview:dateTimeLabel];
        
        // Force dateTimeLabel in full width (to handle auto-layout in case of screen rotation)
        NSLayoutConstraint *leftConstraint = [NSLayoutConstraint constraintWithItem:dateTimeLabel
                                                                          attribute:NSLayoutAttributeLeading
                                                                          relatedBy:NSLayoutRelationEqual
                                                                             toItem:self.bubbleInfoContainer
                                                                          attribute:NSLayoutAttributeLeading
                                                                         multiplier:1.0
                                                                           constant:0];
        NSLayoutConstraint *rightConstraint = [NSLayoutConstraint constraintWithItem:dateTimeLabel
                                                                           attribute:NSLayoutAttributeTrailing
                                                                           relatedBy:NSLayoutRelationEqual
                                                                              toItem:self.bubbleInfoContainer
                                                                           attribute:NSLayoutAttributeTrailing
                                                                          multiplier:1.0
                                                                            constant:0];
        // Vertical constraints are required for iOS > 8
        NSLayoutConstraint *topConstraint = [NSLayoutConstraint constraintWithItem:dateTimeLabel
                                                                         attribute:NSLayoutAttributeTop
                                                                         relatedBy:NSLayoutRelationEqual
                                                                            toItem:self.bubbleInfoContainer
                                                                         attribute:NSLayoutAttributeTop
                                                                        multiplier:1.0
                                                                          constant:component.position.y];
        NSLayoutConstraint *heightConstraint = [NSLayoutConstraint constraintWithItem:dateTimeLabel
                                                                            attribute:NSLayoutAttributeHeight
                                                                            relatedBy:NSLayoutRelationEqual
                                                                               toItem:nil
                                                                            attribute:NSLayoutAttributeNotAnAttribute
                                                                           multiplier:1.0
                                                                             constant:15];
        
        // Available on iOS 8 and later
        [NSLayoutConstraint activateConstraints:@[leftConstraint, rightConstraint, topConstraint, heightConstraint]];
    }
}

- (void)removeTimestampLabels
{
    // In Vector, only time labels are displayed in bubbleInfoContainer
    // So we may remove all bubbleInfoContainer subviews here.
    NSArray* views = [self.bubbleInfoContainer subviews];
    for (UIView* view in views)
    {
        [view removeFromSuperview];
    }
    
    self.bubbleInfoContainer.hidden = YES;
}

- (void)selectComponent:(NSUInteger)componentIndex
{
    MXKRoomBubbleComponent *component;
    if (componentIndex < self.bubbleData.bubbleComponents.count)
    {
        [self addTimestampLabelForComponent:componentIndex];
        
        component  = self.bubbleData.bubbleComponents[componentIndex];
        [self highlightTextMessageForEvent:component.event.eventId];
        
        // Blur timestamp labels which are not related to the selected component (if any)
        for (UIView* view in self.bubbleInfoContainer.subviews)
        {
            // Note dateTime label tag is equal to the index of the related component.
            if (view.tag != componentIndex)
            {
                view.alpha = 0.2;
            }
        }
        
        // Blur read receipts which are not related to the selected component (if any)
        for (UIView* view in self.bubbleOverlayContainer.subviews)
        {
            // Note read receipt container tag is equal to the index of the related component.
            if (view.tag != componentIndex)
            {
                view.alpha = 0.2;
            }
        }
    }
}

- (void)unselectComponent
{
    // Remove all timestamps by default
    [self removeTimestampLabels];
    
    // Restore timestamp for the last message if the current bubble is the last one
    if ([self.bubbleData isKindOfClass:RoomBubbleCellData.class])
    {
        RoomBubbleCellData *cellData = (RoomBubbleCellData*)self.bubbleData;
        if (cellData.isLastBubble && cellData.bubbleComponents.count)
        {
            [self addTimestampLabelForComponent:cellData.bubbleComponents.count - 1];
        }
    }
    
    // Restore original string
    [self highlightTextMessageForEvent:nil];
    
    // Restore read receipts display
    for (UIView* view in self.bubbleOverlayContainer.subviews)
    {
        view.alpha = 1;
    }
}

- (void)setBlurred:(BOOL)blurred
{
    objc_setAssociatedObject(self, @selector(blurred), [NSNumber numberWithBool:blurred], OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    
    if (blurred)
    {
        self.bubbleOverlayContainer.hidden = NO;
        self.bubbleOverlayContainer.backgroundColor = [UIColor whiteColor];
        self.bubbleOverlayContainer.alpha = 0.8;
        self.bubbleOverlayContainer.userInteractionEnabled = YES;
        
        // Blur read receipts if any
        for (UIView* view in self.bubbleOverlayContainer.subviews)
        {
            view.alpha = 0.2;
        }
    }
    else
    {
        if (self.bubbleOverlayContainer.subviews.count)
        {
            // Keep this overlay visible, adjust background color
            self.bubbleOverlayContainer.backgroundColor = [UIColor clearColor];
            self.bubbleOverlayContainer.alpha = 1;
            self.bubbleOverlayContainer.userInteractionEnabled = NO;
            
            // Restore read receipts display
            for (UIView* view in self.bubbleOverlayContainer.subviews)
            {
                view.alpha = 1;
            }
        }
        else
        {
            self.bubbleOverlayContainer.hidden = YES;
        }
    }
}

- (BOOL)blurred
{
    NSNumber *associatedBlurred = objc_getAssociatedObject(self, @selector(blurred));
    if (associatedBlurred)
    {
        return [associatedBlurred boolValue];
    }
    return NO;
}

@end