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修改键盘长按立即清空和撤销删除

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CodeST
2025-12-26 11:47:44 +08:00
parent 8e934dd83a
commit 203f104ece
28 changed files with 798 additions and 71 deletions
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166
CustomKeyboard/Utils/KBBackspaceLongPressHandler.m
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@@ -7,6 +7,7 @@
#import "KBResponderUtils.h"
#import "KBSkinManager.h"
#import "KBBackspaceUndoManager.h"
#import "KBInputBufferManager.h"
static const NSTimeInterval kKBBackspaceLongPressMinDuration = 0.35;
static const NSTimeInterval kKBBackspaceRepeatInterval = 0.06;
@@ -20,11 +21,11 @@ static const CGFloat kKBBackspaceClearLabelHeight = 26.0;
static const CGFloat kKBBackspaceClearLabelPaddingX = 10.0;
static const CGFloat kKBBackspaceClearLabelTopGap = 6.0;
static const CGFloat kKBBackspaceClearLabelHorizontalInset = 6.0;
static const NSInteger kKBBackspaceClearBatchSize = 24;
static const NSTimeInterval kKBBackspaceClearBatchInterval = 0.005;
static const NSTimeInterval kKBBackspaceClearBatchInterval = 0.02;
static const NSInteger kKBBackspaceClearMaxDeletes = 10000;
static const NSInteger kKBBackspaceClearEmptyContextMaxRounds = 40;
static const NSInteger kKBBackspaceClearMaxStep = 80;
static const NSInteger kKBBackspaceClearDeletesPerTick = 10;
typedef NS_ENUM(NSInteger, KBBackspaceChunkClass) {
KBBackspaceChunkClassUnknown = 0,
@@ -34,6 +35,12 @@ typedef NS_ENUM(NSInteger, KBBackspaceChunkClass) {
KBBackspaceChunkClassOther
};
typedef NS_ENUM(NSInteger, KBClearPhase) {
KBClearPhaseSkipWhitespace = 0,
KBClearPhaseSkipTrailingBoundary,
KBClearPhaseDeleteUntilBoundary
};
@interface KBBackspaceLongPressHandler ()
@property (nonatomic, weak) UIView *containerView;
@property (nonatomic, weak) UIView *backspaceButton;
@@ -50,6 +57,7 @@ typedef NS_ENUM(NSInteger, KBBackspaceChunkClass) {
@property (nonatomic, strong) UILabel *backspaceClearLabel;
@property (nonatomic, copy) NSString *pendingClearBefore;
@property (nonatomic, copy) NSString *pendingClearAfter;
@property (nonatomic, assign) KBClearPhase backspaceClearPhase;
@end
@implementation KBBackspaceLongPressHandler
@@ -57,6 +65,7 @@ typedef NS_ENUM(NSInteger, KBBackspaceChunkClass) {
- (instancetype)initWithContainerView:(UIView *)containerView {
if (self = [super init]) {
_containerView = containerView;
_backspaceClearPhase = KBClearPhaseSkipWhitespace;
}
return self;
}
@@ -103,9 +112,17 @@ typedef NS_ENUM(NSInteger, KBBackspaceChunkClass) {
}
switch (gr.state) {
case UIGestureRecognizerStateBegan: {
[self kb_captureDeletionSnapshotIfNeeded];
UIResponder *start = (UIResponder *)([self kb_hostView] ?: self.backspaceButton);
UIInputViewController *ivc = KBFindInputViewController(start);
if (ivc) {
id<UITextDocumentProxy> proxy = ivc.textDocumentProxy;
[[KBInputBufferManager shared] refreshFromProxyIfPossible:proxy];
[[KBInputBufferManager shared] prepareSnapshotForDeleteWithContextBefore:proxy.documentContextBeforeInput
after:proxy.documentContextAfterInput];
}
if (self.showClearLabelEnabled) {
[self kb_capturePendingClearSnapshotIfNeeded];
[[KBInputBufferManager shared] beginPendingClearSnapshot];
}
self.backspaceHoldToken += 1;
NSUInteger token = self.backspaceHoldToken;
@@ -141,6 +158,7 @@ typedef NS_ENUM(NSInteger, KBBackspaceChunkClass) {
if (!ivc) { self.backspaceHoldActive = NO; return; }
id<UITextDocumentProxy> proxy = ivc.textDocumentProxy;
NSString *before = proxy.documentContextBeforeInput ?: @"";
if (before.length == 0) { before = [KBInputBufferManager shared].liveText ?: @""; }
NSTimeInterval elapsed = [NSDate date].timeIntervalSinceReferenceDate - self.backspaceHoldStartTime;
NSInteger deleteCount = 1;
if (before.length > 0) {
@@ -152,9 +170,8 @@ typedef NS_ENUM(NSInteger, KBBackspaceChunkClass) {
[self kb_showBackspaceClearLabelIfNeeded];
}
}
for (NSInteger i = 0; i < deleteCount; i++) {
[proxy deleteBackward];
}
[[KBBackspaceUndoManager shared] captureAndDeleteBackwardFromProxy:proxy count:(NSUInteger)deleteCount];
[[KBInputBufferManager shared] applyHoldDeleteCount:(NSUInteger)deleteCount];
NSTimeInterval interval = [self kb_backspaceRepeatIntervalForElapsed:elapsed];
__weak typeof(self) weakSelf = self;
@@ -229,13 +246,16 @@ typedef NS_ENUM(NSInteger, KBBackspaceChunkClass) {
- (NSInteger)kb_clearDeleteCountForContext:(NSString *)context
hitBoundary:(BOOL *)hitBoundary {
if (context.length == 0) { return kKBBackspaceClearBatchSize; }
if (context.length == 0) {
if (hitBoundary) { *hitBoundary = NO; }
return 1;
}
static NSCharacterSet *sentenceBoundarySet = nil;
static NSCharacterSet *whitespaceSet = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sentenceBoundarySet = [NSCharacterSet characterSetWithCharactersInString:@".!?;。！？；…\n"];
sentenceBoundarySet = [NSCharacterSet characterSetWithCharactersInString:@".!?。！？"];
whitespaceSet = [NSCharacterSet whitespaceAndNewlineCharacterSet];
});
@@ -310,6 +330,12 @@ typedef NS_ENUM(NSInteger, KBBackspaceChunkClass) {
shouldClear = [self kb_isPointInsideBackspaceClearLabel:point];
}
}
#if DEBUG
NSLog(@"[kb_handleBackspaceLongPressEnded] shouldClear=%@ highlighted=%@ labelHidden=%@",
shouldClear ? @"YES" : @"NO",
self.backspaceClearHighlighted ? @"YES" : @"NO",
self.backspaceClearLabel.hidden ? @"YES" : @"NO");
#endif
self.backspaceHoldActive = NO;
self.backspaceChunkModeActive = NO;
self.backspaceHoldToken += 1;
@@ -320,6 +346,8 @@ typedef NS_ENUM(NSInteger, KBBackspaceChunkClass) {
} else {
self.pendingClearBefore = nil;
self.pendingClearAfter = nil;
[[KBInputBufferManager shared] clearPendingClearSnapshot];
[[KBInputBufferManager shared] commitLiveToManual];
}
}
@@ -411,7 +439,7 @@ typedef NS_ENUM(NSInteger, KBBackspaceChunkClass) {
- (UILabel *)backspaceClearLabel {
if (!_backspaceClearLabel) {
UILabel *label = [[UILabel alloc] initWithFrame:CGRectZero];
label.text = @"立刻清空";
label.text = @"上滑清空";
label.textAlignment = NSTextAlignmentCenter;
label.font = [UIFont systemFontOfSize:12 weight:UIFontWeightSemibold];
label.textColor = [KBSkinManager shared].current.keyTextColor ?: UIColor.blackColor;
@@ -431,13 +459,14 @@ typedef NS_ENUM(NSInteger, KBBackspaceChunkClass) {
UIResponder *start = (UIResponder *)([self kb_hostView] ?: self.backspaceButton);
UIInputViewController *ivc = KBFindInputViewController(start);
if (ivc) {
NSString *before = self.pendingClearBefore ?: (ivc.textDocumentProxy.documentContextBeforeInput ?: @"");
NSString *after = self.pendingClearAfter ?: (ivc.textDocumentProxy.documentContextAfterInput ?: @"");
[[KBBackspaceUndoManager shared] recordClearWithContextBefore:before after:after];
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];
}
@@ -450,40 +479,90 @@ typedef NS_ENUM(NSInteger, KBBackspaceChunkClass) {
UIInputViewController *ivc = KBFindInputViewController(start);
if (!ivc) { return; }
id<UITextDocumentProxy> proxy = ivc.textDocumentProxy;
NSString *before = proxy.documentContextBeforeInput ?: @"";
NSInteger count = before.length;
NSInteger batch = 0;
NSInteger nextEmptyRounds = emptyRounds;
BOOL hitBoundary = NO;
if (count > 0) {
batch = [self kb_clearDeleteCountForContext:before hitBoundary:&hitBoundary];
nextEmptyRounds = 0;
} else {
batch = kKBBackspaceClearBatchSize;
nextEmptyRounds = emptyRounds + 1;
}
if (batch <= 0) { batch = 1; }
static NSCharacterSet *sentenceBoundarySet = nil;
static NSCharacterSet *whitespaceSet = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sentenceBoundarySet = [NSCharacterSet characterSetWithCharactersInString:@".!?。！？"];
whitespaceSet = [NSCharacterSet whitespaceAndNewlineCharacterSet];
});
KBClearPhase phase = self.backspaceClearPhase;
if (guard >= kKBBackspaceClearMaxDeletes ||
nextEmptyRounds > kKBBackspaceClearEmptyContextMaxRounds) {
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;
// 即使 context 为空，也尝试删一次（某些宿主延迟更新）
[[KBBackspaceUndoManager shared] captureAndDeleteBackwardFromProxy:proxy count:1];
[[KBInputBufferManager shared] applyClearDeleteCount:1];
deletedThisTick += 1;
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:whitespaceSet].location != NSNotFound);
BOOL isBoundary = ([lastChar rangeOfCharacterFromSet:sentenceBoundarySet].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 (isBoundary) {
[[KBBackspaceUndoManager shared] captureAndDeleteBackwardFromProxy:proxy count:1];
[[KBInputBufferManager shared] applyClearDeleteCount:1];
deletedThisTick += 1;
continue;
}
phase = KBClearPhaseDeleteUntilBoundary;
}
// phase == DeleteUntilBoundary
if (isBoundary) {
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;
}
for (NSInteger i = 0; i < batch; i++) {
[proxy deleteBackward];
}
NSInteger nextGuard = guard + batch;
BOOL shouldContinue = NO;
if (count > 0 && !hitBoundary) {
if (count > batch) {
shouldContinue = YES;
} else if ([proxy hasText]) {
shouldContinue = YES;
}
}
if (!shouldContinue) { return; }
__weak typeof(self) weakSelf = self;
dispatch_after(dispatch_time(DISPATCH_TIME_NOW,
(int64_t)(kKBBackspaceClearBatchInterval * NSEC_PER_SEC)),
@@ -513,7 +592,6 @@ typedef NS_ENUM(NSInteger, KBBackspaceChunkClass) {
}
- (void)kb_capturePendingClearSnapshotIfNeeded {
if ([KBBackspaceUndoManager shared].hasUndo) { return; }
if (self.pendingClearBefore.length > 0 || self.pendingClearAfter.length > 0) { return; }
UIResponder *start = (UIResponder *)([self kb_hostView] ?: self.backspaceButton);
UIInputViewController *ivc = KBFindInputViewController(start);
@@ -521,6 +599,10 @@ typedef NS_ENUM(NSInteger, KBBackspaceChunkClass) {
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