重构

CustomKeyboard/View/KBKeyboardView/KBKeyboardInteractionHandler.m

@@ -0,0 +1,156 @@
+//
+//  KBKeyboardInteractionHandler.m
+//  CustomKeyboard
+//
+
+#import "KBKeyboardInteractionHandler.h"
+#import "KBKeyButton.h"
+#import "KBKey.h"
+#import "KBKeyPreviewView.h"
+
+static const NSTimeInterval kKBPreviewShowDuration = 0.08;
+static const NSTimeInterval kKBPreviewHideDuration = 0.06;
+
+@interface KBKeyboardInteractionHandler ()
+@property (nonatomic, strong) KBKeyPreviewView *previewView;
+@end
+
+@implementation KBKeyboardInteractionHandler
+
+- (UIView *)resolveHitView:(UIView *)hitView
+                     point:(CGPoint)point
+                 container:(UIView *)container
+                  rowViews:(NSArray<UIView *> *)rowViews {
+    if ([hitView isKindOfClass:[KBKeyButton class]]) {
+        return hitView;
+    }
+    if ([self isHitInsideKeyRows:hitView rowViews:rowViews]) {
+        KBKeyButton *btn = [self nearestKeyButtonForPoint:point
+                                                container:container
+                                                 rowViews:rowViews];
+        if (btn) { return btn; }
+    }
+    return hitView;
+}
+
+- (NSArray<KBKeyButton *> *)collectKeyButtonsInView:(UIView *)view {
+    if (!view) { return @[]; }
+    NSMutableArray<KBKeyButton *> *buttons = [NSMutableArray array];
+    [self collectKeyButtonsInView:view into:buttons];
+    return buttons.copy;
+}
+
+- (void)showPreviewForButton:(KBKeyButton *)button inContainer:(UIView *)container {
+    if (!button || !container) { return; }
+    KBKey *key = button.key;
+    if (key.type != KBKeyTypeCharacter) return;
+
+    if (!self.previewView) {
+        self.previewView = [[KBKeyPreviewView alloc] initWithFrame:CGRectZero];
+        self.previewView.hidden = YES;
+        [container addSubview:self.previewView];
+    } else if (self.previewView.superview != container) {
+        [container addSubview:self.previewView];
+    }
+
+    [self.previewView configureWithKey:key icon:button.iconView.image];
+
+    // 计算预览视图位置：在按钮上方稍微偏上
+    CGRect btnFrameInSelf = [button convertRect:button.bounds toView:container];
+    CGFloat previewWidth = 42;
+    CGFloat previewHeight = CGRectGetHeight(btnFrameInSelf) * 1.2;
+    CGFloat centerX = CGRectGetMidX(btnFrameInSelf);
+    CGFloat centerY = CGRectGetMinY(btnFrameInSelf) - previewHeight * 0.6;
+
+    self.previewView.frame = CGRectMake(0, 0, previewWidth, previewHeight);
+    self.previewView.center = CGPointMake(centerX, centerY);
+    self.previewView.alpha = 0.0;
+    self.previewView.hidden = NO;
+
+    [UIView animateWithDuration:kKBPreviewShowDuration
+                          delay:0
+                        options:UIViewAnimationOptionBeginFromCurrentState | UIViewAnimationOptionCurveEaseOut
+                     animations:^{
+                         self.previewView.alpha = 1.0;
+                     }
+                     completion:nil];
+}
+
+- (void)hidePreview {
+    if (!self.previewView || self.previewView.isHidden) return;
+    [UIView animateWithDuration:kKBPreviewHideDuration
+                          delay:0
+                        options:UIViewAnimationOptionBeginFromCurrentState | UIViewAnimationOptionCurveEaseIn
+                     animations:^{
+                         self.previewView.alpha = 0.0;
+                     }
+                     completion:^(BOOL finished) {
+                         self.previewView.hidden = YES;
+                     }];
+}
+
+- (void)bringPreviewToFrontIfNeededInContainer:(UIView *)container {
+    if (!container) { return; }
+    if (self.previewView && self.previewView.superview == container) {
+        [container bringSubviewToFront:self.previewView];
+    }
+}
+
+#pragma mark - Private
+
+- (BOOL)isHitInsideKeyRows:(UIView *)hitView rowViews:(NSArray<UIView *> *)rowViews {
+    if (!hitView) { return NO; }
+    if ([rowViews containsObject:hitView]) { return YES; }
+    for (UIView *row in rowViews) {
+        if ([hitView isDescendantOfView:row]) { return YES; }
+    }
+    return NO;
+}
+
+- (KBKeyButton *)nearestKeyButtonForPoint:(CGPoint)point
+                                container:(UIView *)container
+                                 rowViews:(NSArray<UIView *> *)rowViews {
+    if (!container) { return nil; }
+    KBKeyButton *best = nil;
+    CGFloat bestDistance = CGFLOAT_MAX;
+
+    UIView *targetRow = nil;
+    for (UIView *row in rowViews) {
+        CGRect rowFrame = [container convertRect:row.bounds fromView:row];
+        if (CGRectContainsPoint(rowFrame, point)) {
+            targetRow = row;
+            break;
+        }
+    }
+
+    NSArray<UIView *> *candidateRows = targetRow ? @[targetRow] : rowViews;
+    for (UIView *row in candidateRows) {
+        NSArray<KBKeyButton *> *buttons = [self collectKeyButtonsInView:row];
+        for (KBKeyButton *btn in buttons) {
+            CGRect frame = [container convertRect:btn.frame fromView:btn.superview];
+            CGFloat dx = point.x - CGRectGetMidX(frame);
+            CGFloat dy = point.y - CGRectGetMidY(frame);
+            CGFloat dist = (dx * dx) + (dy * dy);
+            if (dist < bestDistance) {
+                bestDistance = dist;
+                best = btn;
+            }
+        }
+    }
+    return best;
+}
+
+- (void)collectKeyButtonsInView:(UIView *)view
+                           into:(NSMutableArray<KBKeyButton *> *)buttons {
+    for (UIView *sub in view.subviews) {
+        if ([sub isKindOfClass:[KBKeyButton class]]) {
+            [buttons addObject:(KBKeyButton *)sub];
+            continue;
+        }
+        if (sub.subviews.count > 0) {
+            [self collectKeyButtonsInView:sub into:buttons];
+        }
+    }
+}
+
+@end