663 lines
27 KiB
Objective-C
663 lines
27 KiB
Objective-C
//
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// KBBackspaceLongPressHandler.m
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// CustomKeyboard
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//
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#import "KBBackspaceLongPressHandler.h"
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#import "KBResponderUtils.h"
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#import "KBSkinManager.h"
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#import "KBBackspaceUndoManager.h"
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#import "KBInputBufferManager.h"
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static const NSTimeInterval kKBBackspaceLongPressMinDuration = 0.35;
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static const NSTimeInterval kKBBackspaceRepeatInterval = 0.06;
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static const NSTimeInterval kKBBackspaceChunkStartDelay = 0.6;
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static const NSTimeInterval kKBBackspaceChunkRepeatInterval = 0.1;
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static const NSTimeInterval kKBBackspaceChunkFastDelay = 1.2;
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static const NSInteger kKBBackspaceChunkSize = 8;
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static const NSInteger kKBBackspaceChunkSizeFast = 16;
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static const CGFloat kKBBackspaceClearLabelCornerRadius = 8.0;
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static const CGFloat kKBBackspaceClearLabelHeight = 26.0;
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static const CGFloat kKBBackspaceClearLabelPaddingX = 10.0;
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static const CGFloat kKBBackspaceClearLabelTopGap = 6.0;
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static const CGFloat kKBBackspaceClearLabelHorizontalInset = 6.0;
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static const NSTimeInterval kKBBackspaceClearBatchInterval = 0.02;
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static const NSInteger kKBBackspaceClearMaxDeletes = 10000;
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static const NSInteger kKBBackspaceClearEmptyContextMaxRounds = 40;
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static const NSInteger kKBBackspaceClearMaxStep = 80;
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static const NSInteger kKBBackspaceClearDeletesPerTick = 10;
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typedef NS_ENUM(NSInteger, KBBackspaceChunkClass) {
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KBBackspaceChunkClassUnknown = 0,
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KBBackspaceChunkClassWhitespace,
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KBBackspaceChunkClassASCIIWord,
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KBBackspaceChunkClassPunctuation,
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KBBackspaceChunkClassOther
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};
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typedef NS_ENUM(NSInteger, KBClearPhase) {
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KBClearPhaseSkipWhitespace = 0,
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KBClearPhaseSkipTrailingBoundary,
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KBClearPhaseDeleteUntilBoundary
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};
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@interface KBBackspaceLongPressHandler ()
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@property (nonatomic, weak) UIView *containerView;
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@property (nonatomic, weak) UIView *backspaceButton;
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@property (nonatomic, strong) UILongPressGestureRecognizer *longPress;
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@property (nonatomic, assign) BOOL showClearLabelEnabled;
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@property (nonatomic, assign) BOOL backspaceHoldActive;
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@property (nonatomic, assign) NSTimeInterval backspaceHoldStartTime;
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@property (nonatomic, assign) BOOL backspaceChunkModeActive;
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@property (nonatomic, assign) BOOL backspaceClearHighlighted;
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@property (nonatomic, assign) NSUInteger backspaceHoldToken;
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@property (nonatomic, assign) BOOL backspaceHasLastTouchPoint;
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@property (nonatomic, assign) CGPoint backspaceLastTouchPointInSelf;
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@property (nonatomic, assign) NSUInteger backspaceClearToken;
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@property (nonatomic, strong) UILabel *backspaceClearLabel;
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@property (nonatomic, copy) NSString *pendingClearBefore;
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@property (nonatomic, copy) NSString *pendingClearAfter;
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@property (nonatomic, assign) KBClearPhase backspaceClearPhase;
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@end
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@implementation KBBackspaceLongPressHandler
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- (instancetype)initWithContainerView:(UIView *)containerView {
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if (self = [super init]) {
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_containerView = containerView;
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_backspaceClearPhase = KBClearPhaseSkipWhitespace;
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}
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return self;
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}
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- (void)bindDeleteButton:(UIView *)button showClearLabel:(BOOL)showClearLabel {
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if (self.backspaceButton == button) { return; }
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if (self.longPress && self.backspaceButton) {
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[self.backspaceButton removeGestureRecognizer:self.longPress];
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}
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self.backspaceButton = button;
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self.showClearLabelEnabled = showClearLabel;
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self.backspaceHoldActive = NO;
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self.backspaceChunkModeActive = NO;
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self.backspaceClearHighlighted = NO;
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self.backspaceHasLastTouchPoint = NO;
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self.backspaceHoldToken += 1;
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[self kb_hideBackspaceClearLabel];
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self.pendingClearBefore = nil;
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self.pendingClearAfter = nil;
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if (!button) { return; }
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self.longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self
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action:@selector(onBackspaceLongPress:)];
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self.longPress.minimumPressDuration = kKBBackspaceLongPressMinDuration;
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self.longPress.allowableMovement = CGFLOAT_MAX;
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self.longPress.cancelsTouchesInView = YES;
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[button addGestureRecognizer:self.longPress];
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}
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- (void)performClearAction {
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[self kb_clearAllInput];
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}
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#pragma mark - Long Press
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- (void)onBackspaceLongPress:(UILongPressGestureRecognizer *)gr {
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UIView *hostView = [self kb_hostView];
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if (!hostView) { return; }
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if (gr) {
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self.backspaceLastTouchPointInSelf = [gr locationInView:hostView];
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self.backspaceHasLastTouchPoint = YES;
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}
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switch (gr.state) {
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case UIGestureRecognizerStateBegan: {
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UIResponder *start = (UIResponder *)([self kb_hostView] ?: self.backspaceButton);
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UIInputViewController *ivc = KBFindInputViewController(start);
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if (ivc) {
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id<UITextDocumentProxy> proxy = ivc.textDocumentProxy;
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[[KBInputBufferManager shared] refreshFromProxyIfPossible:proxy];
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[[KBInputBufferManager shared] prepareSnapshotForDeleteWithContextBefore:proxy.documentContextBeforeInput
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after:proxy.documentContextAfterInput];
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}
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if (self.showClearLabelEnabled) {
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[self kb_capturePendingClearSnapshotIfNeeded];
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[[KBInputBufferManager shared] beginPendingClearSnapshot];
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}
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self.backspaceHoldToken += 1;
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NSUInteger token = self.backspaceHoldToken;
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self.backspaceHoldActive = YES;
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self.backspaceHoldStartTime = [NSDate date].timeIntervalSinceReferenceDate;
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self.backspaceChunkModeActive = NO;
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[self kb_setBackspaceClearHighlighted:NO];
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[self kb_hideBackspaceClearLabel];
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if (self.showClearLabelEnabled) {
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[self kb_showBackspaceClearLabelIfNeeded];
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}
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[self kb_backspaceStepForToken:token];
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} break;
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case UIGestureRecognizerStateChanged: {
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[self kb_handleBackspaceLongPressChanged:gr];
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} break;
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case UIGestureRecognizerStateEnded:
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case UIGestureRecognizerStateCancelled:
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case UIGestureRecognizerStateFailed: {
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[self kb_handleBackspaceLongPressEnded:gr];
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} break;
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default: break;
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}
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}
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#pragma mark - Delete Steps
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- (void)kb_backspaceStepForToken:(NSUInteger)token {
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if (!self.backspaceHoldActive) { return; }
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if (token != self.backspaceHoldToken) { return; }
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UIResponder *start = (UIResponder *)([self kb_hostView] ?: self.backspaceButton);
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UIInputViewController *ivc = KBFindInputViewController(start);
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if (!ivc) { self.backspaceHoldActive = NO; return; }
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id<UITextDocumentProxy> proxy = ivc.textDocumentProxy;
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NSString *before = proxy.documentContextBeforeInput ?: @"";
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if (before.length == 0) { before = [KBInputBufferManager shared].liveText ?: @""; }
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NSTimeInterval elapsed = [NSDate date].timeIntervalSinceReferenceDate - self.backspaceHoldStartTime;
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NSInteger deleteCount = 1;
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if (before.length > 0) {
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deleteCount = [self kb_backspaceDeleteCountForContext:before elapsed:elapsed];
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}
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if (!self.backspaceChunkModeActive && elapsed >= kKBBackspaceChunkStartDelay) {
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self.backspaceChunkModeActive = YES;
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if (self.showClearLabelEnabled) {
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[self kb_showBackspaceClearLabelIfNeeded];
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}
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}
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[[KBBackspaceUndoManager shared] captureAndDeleteBackwardFromProxy:proxy count:(NSUInteger)deleteCount];
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[[KBInputBufferManager shared] applyHoldDeleteCount:(NSUInteger)deleteCount];
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NSTimeInterval interval = [self kb_backspaceRepeatIntervalForElapsed:elapsed];
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__weak typeof(self) weakSelf = self;
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dispatch_after(dispatch_time(DISPATCH_TIME_NOW,
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(int64_t)(interval * NSEC_PER_SEC)),
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dispatch_get_main_queue(), ^{
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__strong typeof(weakSelf) selfStrong = weakSelf;
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[selfStrong kb_backspaceStepForToken:token];
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});
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}
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- (NSTimeInterval)kb_backspaceRepeatIntervalForElapsed:(NSTimeInterval)elapsed {
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if (elapsed >= kKBBackspaceChunkStartDelay) {
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return kKBBackspaceChunkRepeatInterval;
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}
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return kKBBackspaceRepeatInterval;
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}
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- (NSInteger)kb_backspaceDeleteCountForContext:(NSString *)context elapsed:(NSTimeInterval)elapsed {
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if (elapsed < kKBBackspaceChunkStartDelay) {
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return 1;
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}
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NSInteger maxCount = (elapsed >= kKBBackspaceChunkFastDelay)
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? kKBBackspaceChunkSizeFast : kKBBackspaceChunkSize;
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return [self kb_backspaceChunkDeleteCountForContext:context maxCount:maxCount];
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}
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- (NSInteger)kb_backspaceChunkDeleteCountForContext:(NSString *)context maxCount:(NSInteger)maxCount {
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if (context.length == 0) { return 1; }
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static NSCharacterSet *whitespaceSet = nil;
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static NSCharacterSet *asciiWordSet = nil;
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static NSCharacterSet *punctuationSet = nil;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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whitespaceSet = [NSCharacterSet whitespaceAndNewlineCharacterSet];
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asciiWordSet = [NSCharacterSet characterSetWithCharactersInString:
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@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_"];
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NSMutableCharacterSet *punct = [[NSCharacterSet punctuationCharacterSet] mutableCopy];
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// 补齐常见中文/全角标点（避免 chunk 总是只删 1 个符号）
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[punct addCharactersInString:@"，。！？；：、（）【】《》“”‘’·…—"];
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punctuationSet = [punct copy];
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});
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__block NSInteger deleteCount = 0;
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typedef NS_ENUM(NSInteger, KBBackspaceChunkPhase) {
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KBBackspaceChunkPhaseWhitespace = 0,
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KBBackspaceChunkPhasePunctuation,
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KBBackspaceChunkPhaseCore
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};
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__block KBBackspaceChunkPhase phase = KBBackspaceChunkPhaseWhitespace;
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__block KBBackspaceChunkClass coreClass = KBBackspaceChunkClassUnknown;
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[context enumerateSubstringsInRange:NSMakeRange(0, context.length)
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options:NSStringEnumerationByComposedCharacterSequences | NSStringEnumerationReverse
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usingBlock:^(NSString *substring, __unused NSRange substringRange, __unused NSRange enclosingRange, BOOL *stop) {
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if (substring.length == 0) { return; }
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if (deleteCount >= maxCount) {
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*stop = YES;
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return;
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}
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KBBackspaceChunkClass currentClass = KBBackspaceChunkClassOther;
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if ([substring rangeOfCharacterFromSet:whitespaceSet].location != NSNotFound) {
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currentClass = KBBackspaceChunkClassWhitespace;
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} else if ([substring rangeOfCharacterFromSet:punctuationSet].location != NSNotFound) {
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currentClass = KBBackspaceChunkClassPunctuation;
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} else if ([substring rangeOfCharacterFromSet:asciiWordSet].location != NSNotFound) {
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currentClass = KBBackspaceChunkClassASCIIWord;
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}
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BOOL consumed = NO;
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while (!consumed) {
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if (phase == KBBackspaceChunkPhaseWhitespace) {
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if (currentClass == KBBackspaceChunkClassWhitespace) {
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deleteCount += 1;
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consumed = YES;
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} else {
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phase = KBBackspaceChunkPhasePunctuation;
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}
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continue;
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}
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if (phase == KBBackspaceChunkPhasePunctuation) {
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if (currentClass == KBBackspaceChunkClassPunctuation) {
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deleteCount += 1;
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consumed = YES;
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} else {
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phase = KBBackspaceChunkPhaseCore;
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}
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continue;
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}
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// phase == Core：连续删同一类（ASCII 单词 / 其它），让效果更像微信“几个字一组”
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if (coreClass == KBBackspaceChunkClassUnknown) {
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coreClass = currentClass;
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}
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if (currentClass != coreClass) {
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*stop = YES;
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consumed = YES;
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continue;
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}
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deleteCount += 1;
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consumed = YES;
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}
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if (deleteCount >= maxCount) {
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*stop = YES;
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return;
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}
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}];
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return MAX(deleteCount, 1);
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}
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- (NSInteger)kb_clearDeleteCountForContext:(NSString *)context
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hitBoundary:(BOOL *)hitBoundary {
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if (context.length == 0) {
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if (hitBoundary) { *hitBoundary = NO; }
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return 1;
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}
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static NSCharacterSet *sentenceBoundarySet = nil;
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static NSCharacterSet *whitespaceSet = nil;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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sentenceBoundarySet = [NSCharacterSet characterSetWithCharactersInString:@".!?。！？"];
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whitespaceSet = [NSCharacterSet whitespaceAndNewlineCharacterSet];
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});
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NSInteger length = context.length;
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NSInteger end = length;
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while (end > 0) {
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unichar ch = [context characterAtIndex:end - 1];
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if ([whitespaceSet characterIsMember:ch]) {
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end -= 1;
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} else {
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break;
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}
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}
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NSInteger searchEnd = end;
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while (searchEnd > 0) {
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unichar ch = [context characterAtIndex:searchEnd - 1];
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if ([sentenceBoundarySet characterIsMember:ch]) {
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searchEnd -= 1;
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} else {
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break;
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}
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}
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NSInteger boundaryIndex = NSNotFound;
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for (NSInteger i = searchEnd - 1; i >= 0; i--) {
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unichar ch = [context characterAtIndex:i];
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if ([sentenceBoundarySet characterIsMember:ch]) {
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boundaryIndex = i;
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break;
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}
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}
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BOOL boundaryFound = (boundaryIndex != NSNotFound);
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NSInteger deleteCount = length;
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if (boundaryIndex != NSNotFound) {
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deleteCount = length - (boundaryIndex + 1);
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}
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deleteCount = MAX(deleteCount, 1);
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if (hitBoundary) {
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*hitBoundary = boundaryFound;
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}
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return MIN(deleteCount, kKBBackspaceClearMaxStep);
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}
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#pragma mark - Long Press State
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- (void)kb_handleBackspaceLongPressChanged:(UILongPressGestureRecognizer *)gr {
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if (!self.backspaceHoldActive) { return; }
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if (!self.showClearLabelEnabled) { return; }
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[self kb_showBackspaceClearLabelIfNeeded];
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UIView *hostView = [self kb_hostView];
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if (!hostView) { return; }
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CGPoint point = [gr locationInView:hostView];
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self.backspaceLastTouchPointInSelf = point;
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self.backspaceHasLastTouchPoint = YES;
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BOOL inside = [self kb_isPointInsideBackspaceClearLabel:point];
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[self kb_setBackspaceClearHighlighted:inside];
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}
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- (void)kb_handleBackspaceLongPressEnded:(UILongPressGestureRecognizer *)gr {
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BOOL shouldClear = NO;
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if (self.showClearLabelEnabled) {
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shouldClear = self.backspaceClearHighlighted;
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if (!shouldClear) {
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UIView *hostView = [self kb_hostView];
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CGPoint point = CGPointZero;
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if (gr && hostView) {
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point = [gr locationInView:hostView];
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} else if (self.backspaceHasLastTouchPoint) {
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point = self.backspaceLastTouchPointInSelf;
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}
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shouldClear = [self kb_isPointInsideBackspaceClearLabel:point];
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}
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}
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#if DEBUG
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NSLog(@"[kb_handleBackspaceLongPressEnded] shouldClear=%@ highlighted=%@ labelHidden=%@",
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shouldClear ? @"YES" : @"NO",
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self.backspaceClearHighlighted ? @"YES" : @"NO",
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self.backspaceClearLabel.hidden ? @"YES" : @"NO");
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#endif
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self.backspaceHoldActive = NO;
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self.backspaceChunkModeActive = NO;
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self.backspaceHoldToken += 1;
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self.backspaceHasLastTouchPoint = NO;
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[self kb_hideBackspaceClearLabel];
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if (shouldClear) {
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[self kb_clearAllInput];
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} else {
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self.pendingClearBefore = nil;
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self.pendingClearAfter = nil;
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[[KBInputBufferManager shared] clearPendingClearSnapshot];
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[[KBInputBufferManager shared] commitLiveToManual];
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}
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}
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#pragma mark - Clear Label
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- (void)kb_showBackspaceClearLabelIfNeeded {
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UIView *hostView = [self kb_hostView];
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if (!hostView || !self.backspaceButton) { return; }
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UILabel *label = self.backspaceClearLabel;
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[self kb_refreshBackspaceClearLabelColors];
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if (!label.superview) {
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[hostView addSubview:label];
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}
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[self kb_updateBackspaceClearLabelFrame];
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[hostView bringSubviewToFront:label];
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if (label.hidden) {
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label.alpha = 0.0;
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label.hidden = NO;
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[self kb_playLightHaptic];
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[UIView animateWithDuration:0.12 animations:^{
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label.alpha = 1.0;
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}];
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}
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}
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- (void)kb_hideBackspaceClearLabel {
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if (!_backspaceClearLabel || _backspaceClearLabel.hidden) { return; }
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_backspaceClearLabel.hidden = YES;
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_backspaceClearLabel.alpha = 1.0;
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[self kb_setBackspaceClearHighlighted:NO];
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}
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- (void)kb_updateBackspaceClearLabelFrame {
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UIView *hostView = [self kb_hostView];
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if (!hostView || !self.backspaceButton || !self.backspaceClearLabel) { return; }
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CGRect btnFrame = [self.backspaceButton convertRect:self.backspaceButton.bounds toView:hostView];
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UILabel *label = self.backspaceClearLabel;
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CGSize textSize = [label sizeThatFits:CGSizeMake(CGFLOAT_MAX, kKBBackspaceClearLabelHeight)];
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CGFloat width = MAX(textSize.width + kKBBackspaceClearLabelPaddingX * 2.0, 60.0);
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CGFloat height = kKBBackspaceClearLabelHeight;
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CGFloat x = CGRectGetMidX(btnFrame) - width * 0.5;
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CGFloat y = CGRectGetMinY(btnFrame) - height - kKBBackspaceClearLabelTopGap;
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if (x < kKBBackspaceClearLabelHorizontalInset) { x = kKBBackspaceClearLabelHorizontalInset; }
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CGFloat maxX = CGRectGetWidth(hostView.bounds) - kKBBackspaceClearLabelHorizontalInset - width;
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if (x > maxX) { x = maxX; }
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if (y < 0) { y = 0; }
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label.frame = CGRectIntegral(CGRectMake(x, y, width, height));
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}
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- (BOOL)kb_isPointInsideBackspaceClearLabel:(CGPoint)point {
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if (!self.backspaceClearLabel || self.backspaceClearLabel.hidden) { return NO; }
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[self kb_updateBackspaceClearLabelFrame];
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CGRect hitFrame = CGRectInset(self.backspaceClearLabel.frame, -12.0, -10.0);
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return CGRectContainsPoint(hitFrame, point);
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}
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- (void)kb_setBackspaceClearHighlighted:(BOOL)highlighted {
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if (self.backspaceClearHighlighted == highlighted) { return; }
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self.backspaceClearHighlighted = highlighted;
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[self kb_refreshBackspaceClearLabelColors];
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}
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- (void)kb_refreshBackspaceClearLabelColors {
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UILabel *label = self.backspaceClearLabel;
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label.textColor = [KBSkinManager shared].current.keyTextColor ?: UIColor.blackColor;
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label.backgroundColor = self.backspaceClearHighlighted
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? [self kb_backspaceClearLabelHighlightedColor]
|
||
: [self kb_backspaceClearLabelNormalColor];
|
||
}
|
||
|
||
- (UIColor *)kb_backspaceClearLabelNormalColor {
|
||
KBSkinTheme *t = [KBSkinManager shared].current;
|
||
return t.keyHighlightBackground ?: [UIColor colorWithWhite:0.9 alpha:1.0];
|
||
}
|
||
|
||
- (UIColor *)kb_backspaceClearLabelHighlightedColor {
|
||
KBSkinTheme *t = [KBSkinManager shared].current;
|
||
return t.accentColor ?: t.keyHighlightBackground ?: [UIColor colorWithWhite:0.8 alpha:1.0];
|
||
}
|
||
|
||
- (void)kb_playLightHaptic {
|
||
if (@available(iOS 10.0, *)) {
|
||
UIImpactFeedbackGenerator *gen = [[UIImpactFeedbackGenerator alloc] initWithStyle:UIImpactFeedbackStyleLight];
|
||
[gen prepare];
|
||
[gen impactOccurred];
|
||
}
|
||
}
|
||
|
||
- (UILabel *)backspaceClearLabel {
|
||
if (!_backspaceClearLabel) {
|
||
UILabel *label = [[UILabel alloc] initWithFrame:CGRectZero];
|
||
label.text = @"上滑清空";
|
||
label.textAlignment = NSTextAlignmentCenter;
|
||
label.font = [UIFont systemFontOfSize:12 weight:UIFontWeightSemibold];
|
||
label.textColor = [KBSkinManager shared].current.keyTextColor ?: UIColor.blackColor;
|
||
label.backgroundColor = [self kb_backspaceClearLabelNormalColor];
|
||
label.layer.cornerRadius = kKBBackspaceClearLabelCornerRadius;
|
||
label.layer.masksToBounds = YES;
|
||
label.hidden = YES;
|
||
label.userInteractionEnabled = NO;
|
||
_backspaceClearLabel = label;
|
||
}
|
||
return _backspaceClearLabel;
|
||
}
|
||
|
||
#pragma mark - Clear
|
||
|
||
- (void)kb_clearAllInput {
|
||
UIResponder *start = (UIResponder *)([self kb_hostView] ?: self.backspaceButton);
|
||
UIInputViewController *ivc = KBFindInputViewController(start);
|
||
if (ivc) {
|
||
id<UITextDocumentProxy> proxy = ivc.textDocumentProxy;
|
||
[[KBInputBufferManager shared] refreshFromProxyIfPossible:proxy];
|
||
}
|
||
self.pendingClearBefore = nil;
|
||
self.pendingClearAfter = nil;
|
||
[[KBInputBufferManager shared] clearPendingClearSnapshot];
|
||
self.backspaceClearToken += 1;
|
||
self.backspaceClearPhase = KBClearPhaseSkipWhitespace;
|
||
NSUInteger token = self.backspaceClearToken;
|
||
[self kb_clearAllInputStepForToken:token guard:0 emptyRounds:0];
|
||
}
|
||
|
||
- (void)kb_clearAllInputStepForToken:(NSUInteger)token
|
||
guard:(NSInteger)guard
|
||
emptyRounds:(NSInteger)emptyRounds {
|
||
if (token != self.backspaceClearToken) { return; }
|
||
UIResponder *start = (UIResponder *)([self kb_hostView] ?: self.backspaceButton);
|
||
UIInputViewController *ivc = KBFindInputViewController(start);
|
||
if (!ivc) { return; }
|
||
id<UITextDocumentProxy> proxy = ivc.textDocumentProxy;
|
||
NSInteger nextEmptyRounds = emptyRounds;
|
||
static NSCharacterSet *stopBoundarySet = nil;
|
||
static NSCharacterSet *trailingBoundarySet = nil;
|
||
static NSCharacterSet *trailingWhitespaceSet = nil;
|
||
static dispatch_once_t onceToken;
|
||
dispatch_once(&onceToken, ^{
|
||
// stopBoundary: 遇到这些符号就停（不删除它）
|
||
// - 句末符号：. ! ? 。！？
|
||
// - 省略号：…（中文里“……”常用作句/段落的停顿）
|
||
// - 换行：\n \r（段落边界，避免一次“清空”跨段把全文删完）
|
||
stopBoundarySet = [NSCharacterSet characterSetWithCharactersInString:@".!?。！？…\n\r\u2028\u2029"];
|
||
|
||
// trailingBoundary: 允许作为“尾部句末符号”先删掉，再继续删上一句（更接近微信体验）
|
||
// 注意：不要把换行/省略号放进来，否则可能跨段/跨停顿继续删。
|
||
trailingBoundarySet = [NSCharacterSet characterSetWithCharactersInString:@".!?。！？"];
|
||
|
||
// trailingWhitespace: 只跳过空格/Tab（不包含换行，换行由 stopBoundarySet 处理）
|
||
trailingWhitespaceSet = [NSCharacterSet whitespaceCharacterSet];
|
||
});
|
||
KBClearPhase phase = self.backspaceClearPhase;
|
||
|
||
NSInteger deletedThisTick = 0;
|
||
BOOL shouldStop = NO;
|
||
NSString *lastBefore = nil;
|
||
for (NSInteger i = 0; i < kKBBackspaceClearDeletesPerTick; i++) {
|
||
NSString *before = proxy.documentContextBeforeInput ?: @"";
|
||
if (before.length == 0) {
|
||
nextEmptyRounds += 1;
|
||
// 宿主（微信/QQ 等）可能在长文本场景下返回空 context，即使还有很多内容。
|
||
// 为了避免一次“清空”误删全文：一旦拿不到 before，就立刻停止本次清空。
|
||
shouldStop = YES;
|
||
break;
|
||
}
|
||
nextEmptyRounds = 0;
|
||
|
||
if (lastBefore && [before isEqualToString:lastBefore] && deletedThisTick > 0) {
|
||
// 宿主未及时刷新 context，留到下一 tick 再继续，避免越界/重复记录
|
||
break;
|
||
}
|
||
lastBefore = before;
|
||
|
||
// 取最后一个组合字符
|
||
__block NSString *lastChar = @"";
|
||
[before enumerateSubstringsInRange:NSMakeRange(0, before.length)
|
||
options:NSStringEnumerationByComposedCharacterSequences | NSStringEnumerationReverse
|
||
usingBlock:^(NSString *substring, __unused NSRange substringRange, __unused NSRange enclosingRange, BOOL *stop) {
|
||
lastChar = substring ?: @"";
|
||
*stop = YES;
|
||
}];
|
||
if (lastChar.length == 0) { break; }
|
||
|
||
BOOL isWhitespace = ([lastChar rangeOfCharacterFromSet:trailingWhitespaceSet].location != NSNotFound);
|
||
BOOL isStopBoundary = ([lastChar rangeOfCharacterFromSet:stopBoundarySet].location != NSNotFound);
|
||
BOOL isTrailingBoundary = ([lastChar rangeOfCharacterFromSet:trailingBoundarySet].location != NSNotFound);
|
||
|
||
if (phase == KBClearPhaseSkipWhitespace) {
|
||
if (isWhitespace) {
|
||
[[KBBackspaceUndoManager shared] captureAndDeleteBackwardFromProxy:proxy count:1];
|
||
[[KBInputBufferManager shared] applyClearDeleteCount:1];
|
||
deletedThisTick += 1;
|
||
continue;
|
||
}
|
||
phase = KBClearPhaseSkipTrailingBoundary;
|
||
}
|
||
|
||
if (phase == KBClearPhaseSkipTrailingBoundary) {
|
||
if (isTrailingBoundary) {
|
||
[[KBBackspaceUndoManager shared] captureAndDeleteBackwardFromProxy:proxy count:1];
|
||
[[KBInputBufferManager shared] applyClearDeleteCount:1];
|
||
deletedThisTick += 1;
|
||
continue;
|
||
}
|
||
phase = KBClearPhaseDeleteUntilBoundary;
|
||
}
|
||
|
||
// phase == DeleteUntilBoundary
|
||
if (isStopBoundary) {
|
||
shouldStop = YES; // 保留该句末符号
|
||
break;
|
||
}
|
||
[[KBBackspaceUndoManager shared] captureAndDeleteBackwardFromProxy:proxy count:1];
|
||
[[KBInputBufferManager shared] applyClearDeleteCount:1];
|
||
deletedThisTick += 1;
|
||
if (guard + deletedThisTick >= kKBBackspaceClearMaxDeletes) { break; }
|
||
if (deletedThisTick >= kKBBackspaceClearMaxStep) { break; }
|
||
}
|
||
|
||
self.backspaceClearPhase = phase;
|
||
NSInteger nextGuard = guard + deletedThisTick;
|
||
if (nextGuard >= kKBBackspaceClearMaxDeletes ||
|
||
nextEmptyRounds > kKBBackspaceClearEmptyContextMaxRounds ||
|
||
shouldStop) {
|
||
return;
|
||
}
|
||
|
||
__weak typeof(self) weakSelf = self;
|
||
dispatch_after(dispatch_time(DISPATCH_TIME_NOW,
|
||
(int64_t)(kKBBackspaceClearBatchInterval * NSEC_PER_SEC)),
|
||
dispatch_get_main_queue(), ^{
|
||
__strong typeof(weakSelf) selfStrong = weakSelf;
|
||
[selfStrong kb_clearAllInputStepForToken:token
|
||
guard:nextGuard
|
||
emptyRounds:nextEmptyRounds];
|
||
});
|
||
}
|
||
|
||
#pragma mark - Helpers
|
||
|
||
- (UIView *)kb_hostView {
|
||
if (self.containerView) { return self.containerView; }
|
||
return self.backspaceButton.superview;
|
||
}
|
||
|
||
- (void)kb_captureDeletionSnapshotIfNeeded {
|
||
if ([KBBackspaceUndoManager shared].hasUndo) { return; }
|
||
UIResponder *start = (UIResponder *)([self kb_hostView] ?: self.backspaceButton);
|
||
UIInputViewController *ivc = KBFindInputViewController(start);
|
||
if (!ivc) { return; }
|
||
id<UITextDocumentProxy> proxy = ivc.textDocumentProxy;
|
||
[[KBBackspaceUndoManager shared] recordDeletionSnapshotBefore:proxy.documentContextBeforeInput
|
||
after:proxy.documentContextAfterInput];
|
||
}
|
||
|
||
- (void)kb_capturePendingClearSnapshotIfNeeded {
|
||
if (self.pendingClearBefore.length > 0 || self.pendingClearAfter.length > 0) { return; }
|
||
UIResponder *start = (UIResponder *)([self kb_hostView] ?: self.backspaceButton);
|
||
UIInputViewController *ivc = KBFindInputViewController(start);
|
||
if (!ivc) { return; }
|
||
id<UITextDocumentProxy> proxy = ivc.textDocumentProxy;
|
||
self.pendingClearBefore = proxy.documentContextBeforeInput ?: @"";
|
||
self.pendingClearAfter = proxy.documentContextAfterInput ?: @"";
|
||
#if DEBUG
|
||
NSLog(@"[kb_capturePendingClearSnapshotIfNeeded/before] len=%lu text=%@", (unsigned long)self.pendingClearBefore.length, self.pendingClearBefore);
|
||
NSLog(@"[kb_capturePendingClearSnapshotIfNeeded/after] len=%lu text=%@", (unsigned long)self.pendingClearAfter.length, self.pendingClearAfter);
|
||
#endif
|
||
}
|
||
|
||
@end
|