react-native/Libraries/Text/RCTTextField.m

/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

#import "RCTTextField.h"

#import "RCTConvert.h"
#import "RCTEventDispatcher.h"
#import "RCTUtils.h"
#import "UIView+React.h"

@implementation RCTTextField
{
  RCTEventDispatcher *_eventDispatcher;
  NSMutableArray *_reactSubviews;
  BOOL _jsRequestingFirstResponder;
  NSInteger _nativeEventCount;
}

- (instancetype)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher
{
  if ((self = [super initWithFrame:CGRectZero])) {
    RCTAssert(eventDispatcher, @"eventDispatcher is a required parameter");
    _eventDispatcher = eventDispatcher;
    [self addTarget:self action:@selector(textFieldDidChange) forControlEvents:UIControlEventEditingChanged];
    [self addTarget:self action:@selector(textFieldBeginEditing) forControlEvents:UIControlEventEditingDidBegin];
    [self addTarget:self action:@selector(textFieldEndEditing) forControlEvents:UIControlEventEditingDidEnd];
    [self addTarget:self action:@selector(textFieldSubmitEditing) forControlEvents:UIControlEventEditingDidEndOnExit];
    _reactSubviews = [NSMutableArray new];
  }
  return self;
}

RCT_NOT_IMPLEMENTED(- (instancetype)initWithFrame:(CGRect)frame)
RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)

- (void)setText:(NSString *)text
{
  NSInteger eventLag = _nativeEventCount - _mostRecentEventCount;
  if (eventLag == 0 && ![text isEqualToString:self.text]) {
    UITextRange *selection = self.selectedTextRange;
    super.text = text;
    self.selectedTextRange = selection; // maintain cursor position/selection - this is robust to out of bounds
  } else if (eventLag > RCTTextUpdateLagWarningThreshold) {
    RCTLogWarn(@"Native TextInput(%@) is %zd events ahead of JS - try to make your JS faster.", self.text, eventLag);
  }
}

static void RCTUpdatePlaceholder(RCTTextField *self)
{
  if (self.placeholder.length > 0 && self.placeholderTextColor) {
    self.attributedPlaceholder = [[NSAttributedString alloc] initWithString:self.placeholder
                                                                 attributes:@{
                                                                              NSForegroundColorAttributeName : self.placeholderTextColor
                                                                              }];
  } else if (self.placeholder.length) {
    self.attributedPlaceholder = [[NSAttributedString alloc] initWithString:self.placeholder];
  }
}

- (void)setPlaceholderTextColor:(UIColor *)placeholderTextColor
{
  _placeholderTextColor = placeholderTextColor;
  RCTUpdatePlaceholder(self);
}

- (void)setPlaceholder:(NSString *)placeholder
{
  super.placeholder = placeholder;
  RCTUpdatePlaceholder(self);
}

- (NSArray *)reactSubviews
{
  // TODO: do we support subviews of textfield in React?
  // In any case, we should have a better approach than manually
  // maintaining array in each view subclass like this
  return _reactSubviews;
}

- (void)removeReactSubview:(UIView *)subview
{
  // TODO: this is a bit broken - if the TextField inserts any of
  // its own views below or between React's, the indices won't match
  [_reactSubviews removeObject:subview];
  [subview removeFromSuperview];
}

- (void)insertReactSubview:(UIView *)view atIndex:(NSInteger)atIndex
{
  // TODO: this is a bit broken - if the TextField inserts any of
  // its own views below or between React's, the indices won't match
  [_reactSubviews insertObject:view atIndex:atIndex];
  [super insertSubview:view atIndex:atIndex];
}

- (CGRect)caretRectForPosition:(UITextPosition *)position
{
  if (_caretHidden) {
    return CGRectZero;
  }
  return [super caretRectForPosition:position];
}

- (CGRect)textRectForBounds:(CGRect)bounds
{
  CGRect rect = [super textRectForBounds:bounds];
  return UIEdgeInsetsInsetRect(rect, _contentInset);
}

- (CGRect)editingRectForBounds:(CGRect)bounds
{
  return [self textRectForBounds:bounds];
}

- (void)setAutoCorrect:(BOOL)autoCorrect
{
  self.autocorrectionType = (autoCorrect ? UITextAutocorrectionTypeYes : UITextAutocorrectionTypeNo);
}

- (BOOL)autoCorrect
{
  return self.autocorrectionType == UITextAutocorrectionTypeYes;
}

- (void)textFieldDidChange
{
  _nativeEventCount++;
  [_eventDispatcher sendTextEventWithType:RCTTextEventTypeChange
                                 reactTag:self.reactTag
                                     text:self.text
                               eventCount:_nativeEventCount];
}

- (void)textFieldEndEditing
{
  [_eventDispatcher sendTextEventWithType:RCTTextEventTypeEnd
                                 reactTag:self.reactTag
                                     text:self.text
                               eventCount:_nativeEventCount];
}
- (void)textFieldSubmitEditing
{
  [_eventDispatcher sendTextEventWithType:RCTTextEventTypeSubmit
                                 reactTag:self.reactTag
                                     text:self.text
                               eventCount:_nativeEventCount];
}

- (void)textFieldBeginEditing
{
  if (_selectTextOnFocus) {
    dispatch_async(dispatch_get_main_queue(), ^{
      [self selectAll:nil];
    });
  }
  [_eventDispatcher sendTextEventWithType:RCTTextEventTypeFocus
                                 reactTag:self.reactTag
                                     text:self.text
                               eventCount:_nativeEventCount];
}

- (BOOL)becomeFirstResponder
{
  _jsRequestingFirstResponder = YES;
  BOOL result = [super becomeFirstResponder];
  _jsRequestingFirstResponder = NO;
  return result;
}

- (BOOL)resignFirstResponder
{
  BOOL result = [super resignFirstResponder];
  if (result)
  {
    [_eventDispatcher sendTextEventWithType:RCTTextEventTypeBlur
                                   reactTag:self.reactTag
                                       text:self.text
                                 eventCount:_nativeEventCount];
  }
  return result;
}

- (BOOL)canBecomeFirstResponder
{
  return _jsRequestingFirstResponder;
}

@end