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46 lines
1.2 KiB
Objective-C
46 lines
1.2 KiB
Objective-C
//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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NS_ASSUME_NONNULL_BEGIN
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typedef NS_ENUM(NSInteger, ConversationViewLayoutAlignment) {
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// We use incoming/outgoing, not left/right to support RTL.
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ConversationViewLayoutAlignment_Incoming,
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ConversationViewLayoutAlignment_Outgoing,
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ConversationViewLayoutAlignment_FullWidth,
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ConversationViewLayoutAlignment_Center,
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};
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@protocol ConversationViewLayoutItem <NSObject>
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- (CGSize)cellSizeForViewWidth:(int)viewWidth contentWidth:(int)contentWidth;
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- (ConversationViewLayoutAlignment)layoutAlignment;
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@end
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#pragma mark -
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@protocol ConversationViewLayoutDelegate <NSObject>
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- (NSArray<id<ConversationViewLayoutItem>> *)layoutItems;
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- (CGFloat)layoutHeaderHeight;
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@end
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#pragma mark -
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// A new lean and efficient layout for conversation view designed to
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// handle our edge cases (e.g. full-width unread indicators, etc.).
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@interface ConversationViewLayout : UICollectionViewLayout
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@property (nonatomic, weak) id<ConversationViewLayoutDelegate> delegate;
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@property (nonatomic, readonly) BOOL hasLayout;
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@property (nonatomic, readonly) BOOL hasEverHadLayout;
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@property (nonatomic, readonly) int contentWidth;
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@end
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NS_ASSUME_NONNULL_END
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