Adds custom typing indicator support

Examples/Messenger-Shared/MessageTableViewCell.h

@@ -8,8 +8,8 @@
 
 #import <UIKit/UIKit.h>
 
-#define kAvatarSize 30.0
-#define kMinimumHeight 50.0
+static CGFloat kMessageTableViewCellMinimumHeight = 50.0;
+static CGFloat kMessageTableViewCellAvatarHeight = 30.0;
 
 @interface MessageTableViewCell : UITableViewCell
 

Examples/Messenger-Shared/MessageTableViewCell.m

@@ -35,18 +35,19 @@ - (void)configureSubviews
                             @"attachmentView": self.attachmentView,
                             };
 
-    NSDictionary *metrics = @{@"tumbSize": @(kAvatarSize),
-                              @"trailing": @10,
-                              @"leading": @5,
+    NSDictionary *metrics = @{@"tumbSize": @(kMessageTableViewCellAvatarHeight),
+                              @"padding": @15,
+                              @"right": @10,
+                              @"left": @5,
                               @"attchSize": @80,
                               };
 
-    [self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-leading-[thumbnailView(tumbSize)]-trailing-[titleLabel(>=0)]-trailing-|" options:0 metrics:metrics views:views]];
-    [self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-leading-[thumbnailView(tumbSize)]-trailing-[bodyLabel(>=0)]-trailing-|" options:0 metrics:metrics views:views]];
-    [self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-leading-[thumbnailView(tumbSize)]-trailing-[attachmentView]-trailing-|" options:0 metrics:metrics views:views]];
+    [self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-left-[thumbnailView(tumbSize)]-right-[titleLabel(>=0)]-right-|" options:0 metrics:metrics views:views]];
+    [self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-left-[thumbnailView(tumbSize)]-right-[bodyLabel(>=0)]-right-|" options:0 metrics:metrics views:views]];
+    [self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-left-[thumbnailView(tumbSize)]-right-[attachmentView]-right-|" options:0 metrics:metrics views:views]];
 
-    [self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-trailing-[thumbnailView(tumbSize)]-(>=0)-|" options:0 metrics:metrics views:views]];
-    [self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-15-[titleLabel]-leading-[bodyLabel(>=0)]-leading-[attachmentView(>=0,<=attchSize)]-trailing-|" options:0 metrics:metrics views:views]];
+    [self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-right-[thumbnailView(tumbSize)]-(>=0)-|" options:0 metrics:metrics views:views]];
+    [self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-padding-[titleLabel]-left-[bodyLabel(>=0)]-left-[attachmentView(>=0,<=attchSize)]-right-|" options:0 metrics:metrics views:views]];
 }
 
 - (void)prepareForReuse
@@ -100,7 +101,7 @@ - (UIImageView *)thumbnailView
         _thumbnailView.userInteractionEnabled = NO;
         _thumbnailView.backgroundColor = [UIColor colorWithWhite:0.9 alpha:1.0];
 
-        _thumbnailView.layer.cornerRadius = kAvatarSize/2.0;
+        _thumbnailView.layer.cornerRadius = kMessageTableViewCellAvatarHeight/2.0;
         _thumbnailView.layer.masksToBounds = YES;
     }
     return _thumbnailView;
@@ -115,7 +116,7 @@ - (UIImageView *)attachmentView
         _attachmentView.backgroundColor = [UIColor clearColor];
         _attachmentView.contentMode = UIViewContentModeCenter;
 
-        _attachmentView.layer.cornerRadius = kAvatarSize/4.0;
+        _attachmentView.layer.cornerRadius = kMessageTableViewCellAvatarHeight/4.0;
         _attachmentView.layer.masksToBounds = YES;
     }
     return _attachmentView;

Examples/Messenger-Shared/MessageViewController.m

@@ -9,10 +9,13 @@
 #import "MessageViewController.h"
 #import "MessageTableViewCell.h"
 #import "MessageTextView.h"
+#import "TypingIndicatorView.h"
 #import "Message.h"
 
 #import <LoremIpsum/LoremIpsum.h>
 
+#define DEBUG_CUSTOM_TYPING_INDICATOR 0
+
 static NSString *MessengerCellIdentifier = @"MessengerCell";
 static NSString *AutoCompletionCellIdentifier = @"AutoCompletionCell";
 
@@ -34,8 +37,7 @@ - (id)init
 {
     self = [super initWithTableViewStyle:UITableViewStylePlain];
     if (self) {
-        // Register a subclass of SLKTextView, if you need any special appearance and/or behavior customisation.
-        [self registerClassForTextView:[MessageTextView class]];
+        [self commonInit];
     }
     return self;
 }
@@ -44,8 +46,7 @@ - (id)initWithCoder:(NSCoder *)aDecoder
 {
     self = [super initWithCoder:aDecoder];
     if (self) {
-        // Register a subclass of SLKTextView, if you need any special appearance and/or behavior customisation.
-        [self registerClassForTextView:[MessageTextView class]];
+        [self commonInit];
     }
     return self;
 }
@@ -55,6 +56,17 @@ + (UITableViewStyle)tableViewStyleForCoder:(NSCoder *)decoder
     return UITableViewStylePlain;
 }
 
+- (void)commonInit
+{
+    // Register a SLKTextView subclass, if you need any special appearance and/or behavior customisation.
+    [self registerClassForTextView:[MessageTextView class]];
+
+#if DEBUG_CUSTOM_TYPING_INDICATOR
+    // Register a UIView subclass, conforming to SLKTypingIndicatorProtocol, to use a custom typing indicator view.
+    [self registerClassForTypingIndicatorView:[TypingIndicatorView class]];
+#endif
+}
+
 
 #pragma mark - View lifecycle
 
@@ -111,7 +123,9 @@ - (void)viewDidLoad
     self.textInputbar.counterStyle = SLKCounterStyleSplit;
     self.textInputbar.counterPosition = SLKCounterPositionTop;
 
+#if !DEBUG_CUSTOM_TYPING_INDICATOR
     self.typingIndicatorView.canResignByTouch = YES;
+#endif
 
     [self.autoCompletionView registerClass:[MessageTableViewCell class] forCellReuseIdentifier:AutoCompletionCellIdentifier];
     [self registerPrefixesForAutoCompletion:@[@"@", @"#", @":"]];
@@ -145,8 +159,23 @@ - (void)fillWithText:(id)sender
 
 - (void)simulateUserTyping:(id)sender
 {
-    if (!self.isEditing && !self.isAutoCompleting) {
+    if ([self canShowTypingIndicator]) {
+
+#if DEBUG_CUSTOM_TYPING_INDICATOR
+        __block TypingIndicatorView *view = (TypingIndicatorView *)self.typingIndicatorProxyView;
+
+        CGFloat scale = [UIScreen mainScreen].scale;
+        CGSize imgSize = CGSizeMake(kTypingIndicatorViewAvatarHeight*scale, kTypingIndicatorViewAvatarHeight*scale);
+
+        // This will cause the typing indicator to show after a delay ¯\_(ツ)_/¯
+        [LoremIpsum asyncPlaceholderImageWithSize:imgSize
+                                       completion:^(UIImage *image) {
+                                           UIImage *thumbnail = [UIImage imageWithCGImage:image.CGImage scale:scale orientation:UIImageOrientationUp];
+                                           [view presentIndicatorWithName:[LoremIpsum name] image:thumbnail];
+                                       }];
+#else
         [self.typingIndicatorView insertUsername:[LoremIpsum name]];
+#endif
     }
 }
 
@@ -322,6 +351,15 @@ - (BOOL)canPressRightButton
     return [super canPressRightButton];
 }
 
+- (BOOL)canShowTypingIndicator
+{
+#if DEBUG_CUSTOM_TYPING_INDICATOR
+    return YES;
+#else
+    return [super canShowTypingIndicator];
+#endif
+}
+
 - (BOOL)canShowAutoCompletion
 {
     NSArray *array = nil;
@@ -414,12 +452,7 @@ - (MessageTableViewCell *)messageCellForRowAtIndexPath:(NSIndexPath *)indexPath
     if (cell.needsPlaceholder)
     {
         CGFloat scale = [UIScreen mainScreen].scale;
-
-        if ([[UIScreen mainScreen] respondsToSelector:@selector(nativeScale)]) {
-            scale = [UIScreen mainScreen].nativeScale;
-        }
-
-        CGSize imgSize = CGSizeMake(kAvatarSize*scale, kAvatarSize*scale);
+        CGSize imgSize = CGSizeMake(kMessageTableViewCellAvatarHeight*scale, kMessageTableViewCellAvatarHeight*scale);
 
         [LoremIpsum asyncPlaceholderImageWithSize:imgSize
                                        completion:^(UIImage *image) {
@@ -470,7 +503,7 @@ - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPa
         NSDictionary *attributes = @{NSFontAttributeName: [UIFont systemFontOfSize:16.0],
                                      NSParagraphStyleAttributeName: paragraphStyle};
 
-        CGFloat width = CGRectGetWidth(tableView.frame)-kAvatarSize;
+        CGFloat width = CGRectGetWidth(tableView.frame)-kMessageTableViewCellAvatarHeight;
         width -= 25.0;
 
         CGRect titleBounds = [message.username boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin attributes:attributes context:NULL];
@@ -487,14 +520,14 @@ - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPa
             height += 80.0 + 10.0;
         }
 
-        if (height < kMinimumHeight) {
-            height = kMinimumHeight;
+        if (height < kMessageTableViewCellMinimumHeight) {
+            height = kMessageTableViewCellMinimumHeight;
         }
 
         return height;
     }
     else {
-        return kMinimumHeight;
+        return kMessageTableViewCellMinimumHeight;
     }
 }
 

Examples/Messenger-Shared/TypingIndicatorView.h

@@ -0,0 +1,20 @@
+//
+//  TypingIndicatorView.h
+//  Messenger
+//
+//  Created by Ignacio Romero Z. on 6/27/15.
+//  Copyright (c) 2015 Slack Technologies, Inc. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+#import "SLKTypingIndicatorProtocol.h"
+
+static CGFloat kTypingIndicatorViewMinimumHeight = 80.0;
+static CGFloat kTypingIndicatorViewAvatarHeight = 30.0;
+
+@interface TypingIndicatorView : UIView <SLKTypingIndicatorProtocol>
+
+- (void)presentIndicatorWithName:(NSString *)name image:(UIImage *)image;
+- (void)dismissIndicator;
+
+@end

Examples/Messenger-Shared/TypingIndicatorView.m

@@ -0,0 +1,175 @@
+//
+//  TypingIndicatorView.m
+//  Messenger
+//
+//  Created by Ignacio Romero Z. on 6/27/15.
+//  Copyright (c) 2015 Slack Technologies, Inc. All rights reserved.
+//
+
+#import "TypingIndicatorView.h"
+
+@interface TypingIndicatorView ()
+@property (nonatomic, strong) UIImageView *thumbnailView;
+@property (nonatomic, strong) UILabel *titleLabel;
+@property (nonatomic, strong) CAGradientLayer *backgroundGradient;
+@end
+
+@implementation TypingIndicatorView
+@synthesize visible = _visible;
+
+- (instancetype)init
+{
+    self = [super init];
+    if (self) {
+        [self configureSubviews];
+    }
+    return self;
+}
+
+- (void)configureSubviews
+{
+    [self addSubview:self.thumbnailView];
+    [self addSubview:self.titleLabel];
+    [self.layer insertSublayer:self.backgroundGradient atIndex:0];
+
+    NSDictionary *views = @{@"thumbnailView": self.thumbnailView,
+                            @"titleLabel": self.titleLabel
+                            };
+
+    NSDictionary *metrics = @{@"invertedThumbSize": @(-kTypingIndicatorViewAvatarHeight/2.0),
+                              };
+
+    [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-5-[thumbnailView]-10-[titleLabel]-(>=0)-|" options:0 metrics:metrics views:views]];
+    [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-(>=0)-[thumbnailView]-(invertedThumbSize)-|" options:0 metrics:metrics views:views]];
+    [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-(>=0)-[titleLabel]-(3@750)-|" options:0 metrics:metrics views:views]];
+}
+
+
+#pragma mark - SLKTypingIndicatorProtocol
+
+- (void)dismissIndicator
+{
+    if (self.isVisible) {
+        self.visible = NO;
+    }
+}
+
+
+#pragma mark - UIView
+
+- (void)layoutSubviews
+{
+    [super layoutSubviews];
+
+    self.backgroundGradient.frame = self.bounds;
+}
+
+
+#pragma mark - Getters
+
+- (UIImageView *)thumbnailView
+{
+    if (!_thumbnailView) {
+        _thumbnailView = [UIImageView new];
+        _thumbnailView.translatesAutoresizingMaskIntoConstraints = NO;
+        _thumbnailView.userInteractionEnabled = NO;
+        _thumbnailView.backgroundColor = [UIColor grayColor];
+        _thumbnailView.contentMode = UIViewContentModeTopLeft;
+
+        _thumbnailView.layer.cornerRadius = kTypingIndicatorViewAvatarHeight/2.0;
+        _thumbnailView.layer.masksToBounds = YES;
+    }
+    return _thumbnailView;
+}
+
+- (UILabel *)titleLabel
+{
+    if (!_titleLabel) {
+        _titleLabel = [UILabel new];
+        _titleLabel.translatesAutoresizingMaskIntoConstraints = NO;
+        _titleLabel.backgroundColor = [UIColor clearColor];
+        _titleLabel.userInteractionEnabled = NO;
+        _titleLabel.numberOfLines = 1;
+        _titleLabel.contentMode = UIViewContentModeTopLeft;
+
+        _titleLabel.font = [UIFont systemFontOfSize:12.0];
+        _titleLabel.textColor = [UIColor lightGrayColor];
+    }
+    return _titleLabel;
+}
+
+- (CAGradientLayer *)backgroundGradient
+{
+    if (!_backgroundGradient) {
+        _backgroundGradient = [CAGradientLayer layer];
+        _backgroundGradient.frame = CGRectMake(0.0, 0.0, [UIScreen mainScreen].bounds.size.width, [self height]);
+
+        _backgroundGradient.colors = @[(id)[UIColor colorWithWhite:1.0 alpha:0].CGColor,
+                                       (id)[UIColor colorWithWhite:1.0 alpha:0.9].CGColor,
+                                       (id)[UIColor colorWithWhite:1.0 alpha:1.0].CGColor];
+
+        _backgroundGradient.locations = @[@0, @0.5, @1];
+        _backgroundGradient.rasterizationScale = [UIScreen mainScreen].scale;
+        _backgroundGradient.shouldRasterize = YES;
+    }
+    return _backgroundGradient;
+}
+
+- (CGSize)intrinsicContentSize
+{
+    return CGSizeMake(UIViewNoIntrinsicMetric, [self height]);
+}
+
+- (CGFloat)height
+{
+    CGFloat height = 13.0;
+    height += self.titleLabel.font.lineHeight;
+    return height;
+}
+
+
+#pragma mark - TypingIndicatorView
+
+- (void)presentIndicatorWithName:(NSString *)name image:(UIImage *)image
+{
+    if (self.isVisible || name.length == 0 || !image) {
+        return;
+    }
+
+    NSString *text = [NSString stringWithFormat:@"%@ is typing...", name];
+
+    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:text];
+    [attributedString addAttributes:@{NSFontAttributeName: [UIFont boldSystemFontOfSize:12.0]} range:[text rangeOfString:name]];
+
+    self.titleLabel.attributedText = attributedString;
+    self.thumbnailView.image = image;
+
+    self.visible = YES;
+}
+
+
+#pragma mark - Hit Testing
+
+- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
+{
+    [super touchesBegan:touches withEvent:event];
+}
+
+- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
+{
+    [super touchesEnded:touches withEvent:event];
+
+    [self dismissIndicator];
+}
+
+
+#pragma mark - Lifeterm
+
+- (void)dealloc
+{
+    _titleLabel = nil;
+    _thumbnailView = nil;
+    _backgroundGradient = nil;
+}
+
+@end