Repo created

iphone/Maps/Common/Keyboard/MWMKeyboard.h

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+#import "MWMKeyboardObserver.h"
+
+@interface MWMKeyboard : NSObject
+
++ (void)applicationDidBecomeActive;
+
++ (void)addObserver:(id<MWMKeyboardObserver>)observer;
++ (void)removeObserver:(id<MWMKeyboardObserver>)observer;
+
++ (CGFloat)keyboardHeight;
+
+- (instancetype)init __attribute__((unavailable("call +manager instead")));
+- (instancetype)copy __attribute__((unavailable("call +manager instead")));
+- (instancetype)copyWithZone:(NSZone *)zone __attribute__((unavailable("call +manager instead")));
++ (instancetype)allocWithZone:(struct _NSZone *)zone __attribute__((unavailable("call +manager instead")));
++ (instancetype)new __attribute__((unavailable("call +manager instead")));
+
+@end

iphone/Maps/Common/Keyboard/MWMKeyboard.m

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+#import "MWMKeyboard.h"
+
+@interface MWMKeyboard ()
+
+@property(nonatomic) NSHashTable *observers;
+@property(nonatomic) CGFloat keyboardHeight;
+
+@end
+
+@implementation MWMKeyboard
+
++ (void)applicationDidBecomeActive {
+  [self manager];
+}
+
++ (MWMKeyboard *)manager {
+  static MWMKeyboard *manager;
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+    manager = [[self alloc] initManager];
+  });
+  return manager;
+}
+
+- (instancetype)initManager {
+  self = [super init];
+  if (self) {
+    _observers = [NSHashTable weakObjectsHashTable];
+    NSNotificationCenter *nc = NSNotificationCenter.defaultCenter;
+    [nc addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
+    [nc addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
+  }
+  return self;
+}
+
+- (void)dealloc {
+  [NSNotificationCenter.defaultCenter removeObserver:self];
+}
+
++ (CGFloat)keyboardHeight {
+  return [self manager].keyboardHeight;
+}
+
+#pragma mark - Add/Remove Observers
+
++ (void)addObserver:(id<MWMKeyboardObserver>)observer {
+  [[self manager].observers addObject:observer];
+}
+
++ (void)removeObserver:(id<MWMKeyboardObserver>)observer {
+  [[self manager].observers removeObject:observer];
+}
+
+#pragma mark - Notifications
+
+- (void)onKeyboardWillAnimate {
+  for (id<MWMKeyboardObserver> observer in self.observers) {
+    if ([observer respondsToSelector:@selector(onKeyboardWillAnimate)])
+      [observer onKeyboardWillAnimate];
+  }
+}
+
+- (void)onKeyboardAnimation {
+  for (id<MWMKeyboardObserver> observer in self.observers) {
+    [observer onKeyboardAnimation];
+  }
+}
+
+- (void)keyboardWillShow:(NSNotification *)notification {
+  [self onKeyboardWillAnimate];
+  CGSize keyboardSize = [notification.userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
+  self.keyboardHeight = MIN(keyboardSize.height, keyboardSize.width);
+  NSNumber *duration = notification.userInfo[UIKeyboardAnimationDurationUserInfoKey];
+  NSNumber *curve = notification.userInfo[UIKeyboardAnimationCurveUserInfoKey];
+  [UIView animateWithDuration:duration.doubleValue
+                        delay:0
+                      options:curve.integerValue
+                   animations:^{
+                     [self onKeyboardAnimation];
+                   }
+                   completion:nil];
+}
+
+- (void)keyboardWillHide:(NSNotification *)notification {
+  [self onKeyboardWillAnimate];
+  self.keyboardHeight = 0;
+  NSNumber *duration = notification.userInfo[UIKeyboardAnimationDurationUserInfoKey];
+  NSNumber *curve = notification.userInfo[UIKeyboardAnimationCurveUserInfoKey];
+  [UIView animateWithDuration:duration.doubleValue
+                        delay:0
+                      options:curve.integerValue
+                   animations:^{
+                     [self onKeyboardAnimation];
+                   }
+                   completion:nil];
+}
+
+@end

iphone/Maps/Common/Keyboard/MWMKeyboardObserver.h

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+@protocol MWMKeyboardObserver<NSObject>
+
+- (void)onKeyboardAnimation;
+
+@optional
+- (void)onKeyboardWillAnimate;
+
+@end