mirror of https://github.com/oxen-io/session-ios
Add ConversationViewModel.
Matthew Chen
7 years ago
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//
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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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@class ConversationStyle;
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@class ConversationViewModel;
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@class OWSQuotedReplyModel;
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@class TSThread;
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@class ThreadDynamicInteractions;
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@protocol ConversationViewItem;
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typedef NS_ENUM(NSUInteger, ConversationUpdateType) {
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// No view items in the load window were effected.
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ConversationUpdateType_Minor,
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// A subset of view items in the load window were effected;
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// the view should be updated using the update items.
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ConversationUpdateType_Diff,
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// Complicated or unexpected changes occurred in the load window;
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// the view should be reloaded.
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ConversationUpdateType_Reload,
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};
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#pragma mark -
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typedef NS_ENUM(NSUInteger, ConversationUpdateItemType) {
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ConversationUpdateItemType_Insert,
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ConversationUpdateItemType_Delete,
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ConversationUpdateItemType_Update,
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};
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#pragma mark -
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@interface ConversationUpdateItem : NSObject
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@property (nonatomic, readonly) ConversationUpdateItemType updateItemType;
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// Only applies in the "delete" and "update" cases.
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@property (nonatomic, readonly) NSUInteger oldIndex;
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// Only applies in the "insert" and "update" cases.
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@property (nonatomic, readonly) NSUInteger newIndex;
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// Only applies in the "insert" and "update" cases.
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@property (nonatomic, readonly, nullable) id<ConversationViewItem> viewItem;
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@end
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#pragma mark -
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@interface ConversationUpdate : NSObject
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@property (nonatomic, readonly) ConversationUpdateType conversationUpdateType;
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// Only applies in the "diff" case.
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@property (nonatomic, readonly, nullable) NSArray<ConversationUpdateItem *> *updateItems;
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//// Only applies in the "diff" case.
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@property (nonatomic, readonly) BOOL shouldAnimateUpdates;
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@end
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#pragma mark -
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@protocol ConversationViewModelDelegate <NSObject>
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- (void)conversationViewModelWillUpdate;
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- (void)conversationViewModelDidUpdate:(ConversationUpdate *)conversationUpdate;
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- (void)conversationViewModelWillLoadMoreItems;
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- (void)conversationViewModelDidLoadMoreItems;
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- (void)conversationViewModelDidLoadPrevPage;
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- (void)conversationViewModelRangeDidChange;
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// TODO: It'd be nice to remove this.
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- (BOOL)shouldObserveDBModifications;
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- (ConversationStyle *)conversationStyle;
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@end
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#pragma mark -
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@interface ConversationViewModel : NSObject
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@property (nonatomic, readonly) NSArray<id<ConversationViewItem>> *viewItems;
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@property (nonatomic, nullable) NSString *focusMessageIdOnOpen;
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@property (nonatomic, readonly, nullable) ThreadDynamicInteractions *dynamicInteractions;
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- (instancetype)init NS_UNAVAILABLE;
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- (instancetype)initWithThread:(TSThread *)thread
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focusMessageIdOnOpen:(nullable NSString *)focusMessageIdOnOpen
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delegate:(id<ConversationViewModelDelegate>)delegate NS_DESIGNATED_INITIALIZER;
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- (void)ensureDynamicInteractions;
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- (void)clearUnreadMessagesIndicator;
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- (void)loadAnotherPageOfMessages;
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- (void)viewDidResetContentAndLayout;
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- (void)viewDidLoad;
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- (BOOL)canLoadMoreItems;
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- (nullable NSIndexPath *)ensureLoadWindowContainsQuotedReply:(OWSQuotedReplyModel *)quotedReply;
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@end
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NS_ASSUME_NONNULL_END
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