164 lines
4.2 KiB
Objective-C
164 lines
4.2 KiB
Objective-C
//
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// Copyright (c) 2021 Open Whisper Systems. All rights reserved.
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//
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#import "ThreadViewHelper.h"
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#import <SignalServiceKit/AppContext.h>
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#import <SignalServiceKit/AppReadiness.h>
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#import <SignalServiceKit/SSKEnvironment.h>
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#import <SignalServiceKit/SignalServiceKit-Swift.h>
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#import <SignalServiceKit/StorageCoordinator.h>
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#import <SignalServiceKit/TSThread.h>
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NS_ASSUME_NONNULL_BEGIN
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@interface ThreadViewHelper () <UIDatabaseSnapshotDelegate>
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@property (nonatomic) BOOL shouldObserveDBModifications;
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@end
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#pragma mark -
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@implementation ThreadViewHelper
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- (instancetype)init
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{
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self = [super init];
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if (!self) {
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return self;
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}
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[self initializeMapping];
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return self;
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}
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- (void)dealloc
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{
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[[NSNotificationCenter defaultCenter] removeObserver:self];
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}
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- (void)initializeMapping
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{
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OWSAssertIsOnMainThread();
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[self.databaseStorage appendUIDatabaseSnapshotDelegate:self];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(applicationDidBecomeActive:)
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name:OWSApplicationDidBecomeActiveNotification
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(applicationWillResignActive:)
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name:OWSApplicationWillResignActiveNotification
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object:nil];
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[self updateShouldObserveDBModifications];
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}
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- (void)applicationDidBecomeActive:(NSNotification *)notification
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{
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[self updateShouldObserveDBModifications];
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}
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- (void)applicationWillResignActive:(NSNotification *)notification
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{
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[self updateShouldObserveDBModifications];
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}
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- (void)updateShouldObserveDBModifications
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{
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self.shouldObserveDBModifications = CurrentAppContext().isAppForegroundAndActive;
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}
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// Don't observe database change notifications when the app is in the background.
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//
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// Instead, rebuild model state when app enters foreground.
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- (void)setShouldObserveDBModifications:(BOOL)shouldObserveDBModifications
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{
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if (_shouldObserveDBModifications == shouldObserveDBModifications) {
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return;
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}
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_shouldObserveDBModifications = shouldObserveDBModifications;
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if (shouldObserveDBModifications) {
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[self updateThreads];
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}
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}
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#pragma mark - Database
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- (void)updateThreads
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{
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OWSAssertIsOnMainThread();
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NSMutableArray<TSThread *> *threads = [NSMutableArray new];
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[self.databaseStorage uiReadWithBlock:^(SDSAnyReadTransaction *transaction) {
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AnyThreadFinder *threadFinder = [AnyThreadFinder new];
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NSError *_Nullable error;
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[threadFinder enumerateVisibleThreadsWithIsArchived:NO
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transaction:transaction
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error:&error
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block:^(TSThread *thread) {
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[threads addObject:thread];
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}];
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if (error != nil) {
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OWSFailDebug(@"error: %@", error);
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}
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}];
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_threads = [threads copy];
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}
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#pragma mark - UIDatabaseSnapshotDelegate
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- (void)uiDatabaseSnapshotWillUpdate
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{
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OWSAssertIsOnMainThread();
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OWSAssertDebug(AppReadiness.isAppReady);
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}
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- (void)uiDatabaseSnapshotDidUpdateWithDatabaseChanges:(id<UIDatabaseChanges>)databaseChanges
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{
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OWSAssertIsOnMainThread();
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OWSAssertDebug(AppReadiness.isAppReady);
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if (![databaseChanges didUpdateModelWithCollection:TSThread.collection]) {
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return;
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}
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if (!self.shouldObserveDBModifications) {
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return;
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}
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[self updateThreads];
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}
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- (void)uiDatabaseSnapshotDidUpdateExternally
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{
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OWSAssertIsOnMainThread();
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OWSAssertDebug(AppReadiness.isAppReady);
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if (!self.shouldObserveDBModifications) {
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return;
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}
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[self updateThreads];
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}
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- (void)uiDatabaseSnapshotDidReset
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{
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OWSAssertIsOnMainThread();
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OWSAssertDebug(AppReadiness.isAppReady);
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if (!self.shouldObserveDBModifications) {
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return;
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}
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[self updateThreads];
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}
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@end
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NS_ASSUME_NONNULL_END
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