Extract message bubble view.

Signal.xcodeproj/project.pbxproj

@@ -153,6 +153,7 @@
 		3478506C1FD9B78A007B8332 /* NoopNotificationsManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = 347850681FD9B78A007B8332 /* NoopNotificationsManager.swift */; };
 		347850711FDAEB17007B8332 /* OWSUserProfile.m in Sources */ = {isa = PBXBuildFile; fileRef = 3478506F1FDAEB16007B8332 /* OWSUserProfile.m */; };
 		347850721FDAEB17007B8332 /* OWSUserProfile.h in Headers */ = {isa = PBXBuildFile; fileRef = 347850701FDAEB16007B8332 /* OWSUserProfile.h */; settings = {ATTRIBUTES = (Public, ); }; };
+		3496744D2076768700080B5F /* OWSMessageBubbleView.m in Sources */ = {isa = PBXBuildFile; fileRef = 3496744C2076768700080B5F /* OWSMessageBubbleView.m */; };
 		34A55F3720485465002CC6DE /* OWS2FARegistrationViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = 34A55F3520485464002CC6DE /* OWS2FARegistrationViewController.m */; };
 		34A910601FFEB114000C4745 /* OWSBackup.m in Sources */ = {isa = PBXBuildFile; fileRef = 34A9105F1FFEB114000C4745 /* OWSBackup.m */; };
 		34B0796D1FCF46B100E248C2 /* MainAppContext.m in Sources */ = {isa = PBXBuildFile; fileRef = 34B0796B1FCF46B000E248C2 /* MainAppContext.m */; };
@@ -726,6 +727,8 @@
 		347850701FDAEB16007B8332 /* OWSUserProfile.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = OWSUserProfile.h; sourceTree = "<group>"; };
 		348F2EAD1F0D21BC00D4ECE0 /* DeviceSleepManager.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = DeviceSleepManager.swift; sourceTree = "<group>"; };
 		3495BC911F1426B800B478F5 /* ar */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = ar; path = translations/ar.lproj/Localizable.strings; sourceTree = "<group>"; };
+		3496744B2076768600080B5F /* OWSMessageBubbleView.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = OWSMessageBubbleView.h; sourceTree = "<group>"; };
+		3496744C2076768700080B5F /* OWSMessageBubbleView.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = OWSMessageBubbleView.m; sourceTree = "<group>"; };
 		34A55F3520485464002CC6DE /* OWS2FARegistrationViewController.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = OWS2FARegistrationViewController.m; sourceTree = "<group>"; };
 		34A55F3620485464002CC6DE /* OWS2FARegistrationViewController.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = OWS2FARegistrationViewController.h; sourceTree = "<group>"; };
 		34A9105E1FFEB113000C4745 /* OWSBackup.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = OWSBackup.h; sourceTree = "<group>"; };
@@ -1664,6 +1667,8 @@
 				34D1F09E1F867BFC0066283D /* OWSExpirationTimerView.m */,
 				34D1F0B51F87F8850066283D /* OWSGenericAttachmentView.h */,
 				34D1F0B61F87F8850066283D /* OWSGenericAttachmentView.m */,
+				3496744B2076768600080B5F /* OWSMessageBubbleView.h */,
+				3496744C2076768700080B5F /* OWSMessageBubbleView.m */,
 				34D1F0A11F867BFC0066283D /* OWSMessageCell.h */,
 				34D1F0A21F867BFC0066283D /* OWSMessageCell.m */,
 				34DBF000206BD5A400025978 /* OWSMessageTextView.h */,
@@ -3222,6 +3227,7 @@
 				458E38371D668EBF0094BD24 /* OWSDeviceProvisioningURLParser.m in Sources */,
 				4517642B1DE939FD00EDB8B9 /* ContactCell.swift in Sources */,
 				340FC8AB204DAC8D007AEB0F /* DomainFrontingCountryViewController.m in Sources */,
+				3496744D2076768700080B5F /* OWSMessageBubbleView.m in Sources */,
 				34B3F8751E8DF1700035BE1A /* CallViewController.swift in Sources */,
 				34D8C0281ED3673300188D7C /* DebugUITableViewController.m in Sources */,
 				45F32C222057297A00A300D5 /* MediaDetailViewController.m in Sources */,

Signal/src/ViewControllers/ConversationView/Cells/OWSMessageBubbleView.h

@@ -0,0 +1,46 @@
+//
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
+//
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class ConversationViewItem;
+
+typedef NS_ENUM(NSUInteger, OWSMessageGestureLocation) {
+    // Message text, etc.
+    OWSMessageGestureLocation_Default,
+    OWSMessageGestureLocation_OversizeText,
+    OWSMessageGestureLocation_Media,
+    OWSMessageGestureLocation_QuotedReply,
+};
+
+@interface OWSMessageBubbleView : UIView
+
+@property (nonatomic, nullable) ConversationViewItem *viewItem;
+
+@property (nonatomic) int contentWidth;
+
+@property (nonatomic) NSCache *cellMediaCache;
+
+@property (nonatomic, nullable, readonly) UIView *lastBodyMediaView;
+
+- (instancetype)init NS_UNAVAILABLE;
+
+- (instancetype)initWithFrame:(CGRect)frame NS_DESIGNATED_INITIALIZER;
+
+- (instancetype)initWithCoder:(NSCoder *)coder NS_UNAVAILABLE;
+
+- (void)configureViews;
+
+- (void)loadContent;
+- (void)unloadContent;
+
+- (CGSize)sizeForViewWidth:(int)viewWidth contentWidth:(int)contentWidth;
+
+- (void)prepareForReuse;
+
+- (OWSMessageGestureLocation)gestureLocationForLocation:(CGPoint)locationInMessageBubble;
+
+@end
+
+NS_ASSUME_NONNULL_END

Signal/src/ViewControllers/ConversationView/ConversationViewController.m

@@ -2299,6 +2299,14 @@ typedef enum : NSUInteger {
 
 - (void)scrollDownButtonTapped
 {
+#ifdef DEBUG
+    CGPoint contentOffset = self.collectionView.contentOffset;
+    contentOffset.y += self.collectionView.height
+        - (self.collectionView.contentInset.top + self.collectionView.contentInset.bottom);
+    [self.collectionView setContentOffset:contentOffset animated:NO];
+    return;
+#endif
+
     NSIndexPath *indexPathOfUnreadMessagesIndicator = [self indexPathOfUnreadMessagesIndicator];
     if (indexPathOfUnreadMessagesIndicator != nil) {
         NSInteger unreadRow = indexPathOfUnreadMessagesIndicator.row;

Signal/src/ViewControllers/HomeViewController.m

@@ -284,6 +284,15 @@ typedef NS_ENUM(NSInteger, CellState) { kArchiveState, kInboxState };
     }
 
     [self updateBarButtonItems];
+
+    dispatch_async(dispatch_get_main_queue(), ^{
+        NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
+        TSThread *thread = [self threadForIndexPath:indexPath];
+        if (!thread) {
+            return;
+        }
+        [self presentThread:thread keyboardOnViewAppearing:NO callOnViewAppearing:NO];
+    });
 }
 
 - (void)viewDidAppear:(BOOL)animated