Tap image attachment preview to view full screen.

// FREEBIE

Signal/src/Signal-Bridging-Header.h

@@ -5,10 +5,12 @@
 #import "AppSettingsViewController.h"
 #import "AttachmentSharing.h"
 #import "ContactTableViewCell.h"
+#import "ConversationViewItem.h"
 #import "DateUtil.h"
 #import "DebugUIPage.h"
 #import "Environment.h"
 #import "FingerprintViewController.h"
+#import "FullImageViewController.h"
 #import "HomeViewController.h"
 #import "NSString+OWS.h"
 #import "NotificationsManager.h"

Signal/src/ViewControllers/ConversationView/ConversationViewController.m

@@ -1946,8 +1946,9 @@ typedef NS_ENUM(NSInteger, MessagesRangeSizeMode) {
 
     UIWindow *window = [UIApplication sharedApplication].keyWindow;
     CGRect convertedRect = [imageView convertRect:imageView.bounds toView:window];
-    FullImageViewController *vc =
-        [[FullImageViewController alloc] initWithAttachment:attachmentStream fromRect:convertedRect viewItem:viewItem];
+    FullImageViewController *vc = [[FullImageViewController alloc] initWithAttachmentStream:attachmentStream
+                                                                                   fromRect:convertedRect
+                                                                                   viewItem:viewItem];
     [vc presentFromViewController:self];
 }
 

Signal/src/ViewControllers/FullImageViewController.h

@@ -7,13 +7,17 @@
 NS_ASSUME_NONNULL_BEGIN
 
 @class ConversationViewItem;
+@class SignalAttachment;
 @class TSAttachmentStream;
 
 @interface FullImageViewController : OWSViewController
 
-- (instancetype)initWithAttachment:(TSAttachmentStream *)attachmentStream
-                          fromRect:(CGRect)rect
-                          viewItem:(ConversationViewItem *)viewItem;
+// If viewItem is non-null, long press will show a menu controller.
+- (instancetype)initWithAttachmentStream:(TSAttachmentStream *)attachmentStream
+                                fromRect:(CGRect)rect
+                                viewItem:(ConversationViewItem *_Nullable)viewItem;
+
+- (instancetype)initWithAttachment:(SignalAttachment *)attachment fromRect:(CGRect)rect;
 
 - (void)presentFromViewController:(UIViewController *)viewController;
 

Signal/src/ViewControllers/FullImageViewController.m

@@ -5,6 +5,7 @@
 #import "FullImageViewController.h"
 #import "AttachmentSharing.h"
 #import "ConversationViewItem.h"
+#import "Signal-Swift.h"
 #import "TSAttachmentStream.h"
 #import "TSInteraction.h"
 #import "UIColor+OWS.h"
@@ -56,8 +57,9 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic) BOOL isPresenting;
 @property (nonatomic) NSData *fileData;
 
-@property (nonatomic) TSAttachmentStream *attachmentStream;
-@property (nonatomic) ConversationViewItem *viewItem;
+@property (nonatomic, nullable) TSAttachmentStream *attachmentStream;
+@property (nonatomic, nullable) SignalAttachment *attachment;
+@property (nonatomic, nullable) ConversationViewItem *viewItem;
 
 @property (nonatomic) UIToolbar *footerBar;
 
@@ -65,10 +67,9 @@ NS_ASSUME_NONNULL_BEGIN
 
 @implementation FullImageViewController
 
-
-- (instancetype)initWithAttachment:(TSAttachmentStream *)attachmentStream
-                          fromRect:(CGRect)rect
-                          viewItem:(ConversationViewItem *)viewItem
+- (instancetype)initWithAttachmentStream:(TSAttachmentStream *)attachmentStream
+                                fromRect:(CGRect)rect
+                                viewItem:(ConversationViewItem *_Nullable)viewItem
 {
 
     self = [super initWithNibName:nil bundle:nil];
@@ -77,14 +78,65 @@ NS_ASSUME_NONNULL_BEGIN
         self.attachmentStream = attachmentStream;
         self.originRect  = rect;
         self.viewItem = viewItem;
-        self.fileData = [NSData dataWithContentsOfURL:[attachmentStream mediaURL]];
     }
 
     return self;
 }
 
+- (instancetype)initWithAttachment:(SignalAttachment *)attachment fromRect:(CGRect)rect
+{
+
+    self = [super initWithNibName:nil bundle:nil];
+
+    if (self) {
+        self.attachment = attachment;
+        self.originRect = rect;
+    }
+
+    return self;
+}
+
+- (NSURL *_Nullable)attachmentUrl
+{
+    if (self.attachmentStream) {
+        return self.attachmentStream.mediaURL;
+    } else if (self.attachment) {
+        return self.attachment.dataUrl;
+    } else {
+        return nil;
+    }
+}
+
+- (NSData *)fileData
+{
+    if (_fileData) {
+        NSURL *_Nullable url = self.attachmentUrl;
+        if (url) {
+            _fileData = [NSData dataWithContentsOfURL:url];
+        }
+    }
+    return _fileData;
+}
+
 - (UIImage *)image {
-    return self.attachmentStream.image;
+    if (self.attachmentStream) {
+        return self.attachmentStream.image;
+    } else if (self.attachment) {
+        return self.attachment.image;
+    } else {
+        return nil;
+    }
+}
+
+- (BOOL)isAnimated
+{
+    if (self.attachmentStream) {
+        return self.attachmentStream.isAnimated;
+    } else if (self.attachment) {
+        return self.attachment.isAnimatedImage;
+    } else {
+        return NO;
+    }
 }
 
 - (void)loadView {
@@ -150,7 +202,7 @@ NS_ASSUME_NONNULL_BEGIN
 - (void)shareWasPressed:(id)sender {
     DDLogInfo(@"%@: sharing image.", self.tag);
 
-    [AttachmentSharing showShareUIForURL:[self.attachmentStream mediaURL]];
+    [AttachmentSharing showShareUIForURL:self.attachmentUrl];
 }
 
 - (void)initializeScrollView {
@@ -162,13 +214,6 @@ NS_ASSUME_NONNULL_BEGIN
     [self.contentView addSubview:self.scrollView];
 }
 
-- (BOOL)isAnimated
-{
-    OWSAssert(self.attachmentStream);
-
-    return self.attachmentStream.isAnimated;
-}
-
 - (void)initializeImageView {
     if (self.isAnimated) {
         if ([self.fileData ows_isValidImage]) {
@@ -249,6 +294,9 @@ NS_ASSUME_NONNULL_BEGIN
 - (void)longPressGesture:(UIGestureRecognizer *)sender {
     // We "eagerly" respond when the long press begins, not when it ends.
     if (sender.state == UIGestureRecognizerStateBegan) {
+        if (!self.viewItem) {
+            return;
+        }
 
         [self.view becomeFirstResponder];
         

Signal/src/ViewControllers/MediaMessageView.swift

@@ -181,6 +181,9 @@ class MediaMessageView: UIView, OWSAudioAttachmentPlayerDelegate {
         let aspectRatio = image.size.width / image.size.height
         addSubviewWithScaleAspectFitLayout(view:animatedImageView, aspectRatio:aspectRatio)
         contentView = animatedImageView
+
+        animatedImageView.isUserInteractionEnabled = true
+        animatedImageView.addGestureRecognizer(UITapGestureRecognizer(target:self, action:#selector(imageTapped)))
     }
 
     private func addSubviewWithScaleAspectFitLayout(view: UIView, aspectRatio: CGFloat) {
@@ -212,7 +215,10 @@ class MediaMessageView: UIView, OWSAudioAttachmentPlayerDelegate {
         let aspectRatio = image.size.width / image.size.height
         addSubviewWithScaleAspectFitLayout(view:imageView, aspectRatio:aspectRatio)
         contentView = imageView
-    }
+
+        imageView.isUserInteractionEnabled = true
+        imageView.addGestureRecognizer(UITapGestureRecognizer(target:self, action:#selector(imageTapped)))
+}
 
     private func createVideoPreview() {
         guard let image = attachment.videoPreview() else {
@@ -391,13 +397,44 @@ class MediaMessageView: UIView, OWSAudioAttachmentPlayerDelegate {
         audioPlayButton?.imageView?.tintColor = UIColor.ows_materialBlue()
     }
 
+    // MARK: - Full Screen Image
+
+    func imageTapped(sender: UIGestureRecognizer) {
+        guard sender.state == .recognized else {
+            return
+        }
+        guard let fromView = sender.view else {
+            return
+        }
+        guard let fromViewController = fromViewController() else {
+            return
+        }
+        let window = UIApplication.shared.keyWindow
+        let convertedRect = fromView.convert(fromView.bounds, to:window)
+        let viewController = FullImageViewController(attachment:attachment, from:convertedRect)
+        viewController.present(from:fromViewController)
+    }
+
+    private func fromViewController() -> UIViewController? {
+        var responder: UIResponder? = self
+        while true {
+            if responder == nil {
+                return nil
+            }
+            if let viewController = responder as? UIViewController {
+                return viewController
+            }
+            responder = responder?.next
+        }
+    }
+
     // MARK: - Video Playback
 
     func videoTapped(sender: UIGestureRecognizer) {
-        guard let dataUrl = attachment.dataUrl else {
+        guard sender.state == .recognized else {
             return
         }
-        guard sender.state == .recognized else {
+        guard let dataUrl = attachment.dataUrl else {
             return
         }
         guard let videoPlayer = MPMoviePlayerController(contentURL: dataUrl) else {