143 lines
5.0 KiB
Objective-C
143 lines
5.0 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import "RCTTextField.h"
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#import <React/RCTBridge.h>
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#import <React/RCTConvert.h>
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#import <React/RCTEventDispatcher.h>
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#import <React/RCTFont.h>
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#import <React/RCTUIManager.h>
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#import <React/RCTUtils.h>
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#import <React/UIView+React.h>
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#import "RCTBackedTextInputDelegate.h"
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#import "RCTTextSelection.h"
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#import "RCTUITextField.h"
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@interface RCTTextField () <RCTBackedTextInputDelegate>
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@end
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@implementation RCTTextField
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{
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RCTUITextField *_backedTextInput;
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BOOL _submitted;
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CGSize _previousContentSize;
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}
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- (instancetype)initWithBridge:(RCTBridge *)bridge
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{
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if (self = [super initWithBridge:bridge]) {
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// `blurOnSubmit` defaults to `true` for <TextInput multiline={false}> by design.
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_blurOnSubmit = YES;
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_backedTextInput = [[RCTUITextField alloc] initWithFrame:self.bounds];
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_backedTextInput.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
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_backedTextInput.textInputDelegate = self;
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_backedTextInput.font = self.fontAttributes.font;
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[self addSubview:_backedTextInput];
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}
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return self;
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}
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RCT_NOT_IMPLEMENTED(- (instancetype)initWithFrame:(CGRect)frame)
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RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)
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- (id<RCTBackedTextInputViewProtocol>)backedTextInputView
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{
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return _backedTextInput;
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}
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- (void)sendKeyValueForString:(NSString *)string
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{
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[_eventDispatcher sendTextEventWithType:RCTTextEventTypeKeyPress
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reactTag:self.reactTag
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text:nil
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key:string
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eventCount:_nativeEventCount];
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}
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#pragma mark - Properties
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- (NSString *)text
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{
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return _backedTextInput.text;
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}
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- (void)setText:(NSString *)text
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{
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NSInteger eventLag = _nativeEventCount - _mostRecentEventCount;
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if (eventLag == 0 && ![text isEqualToString:self.text]) {
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UITextRange *selection = _backedTextInput.selectedTextRange;
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NSInteger oldTextLength = _backedTextInput.text.length;
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_backedTextInput.text = text;
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if (selection.empty) {
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// maintain cursor position relative to the end of the old text
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NSInteger offsetStart = [_backedTextInput offsetFromPosition:_backedTextInput.beginningOfDocument toPosition:selection.start];
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NSInteger offsetFromEnd = oldTextLength - offsetStart;
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NSInteger newOffset = text.length - offsetFromEnd;
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UITextPosition *position = [_backedTextInput positionFromPosition:_backedTextInput.beginningOfDocument offset:newOffset];
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[_backedTextInput setSelectedTextRange:[_backedTextInput textRangeFromPosition:position toPosition:position]
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notifyDelegate:YES];
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}
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} else if (eventLag > RCTTextUpdateLagWarningThreshold) {
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RCTLogWarn(@"Native TextInput(%@) is %lld events ahead of JS - try to make your JS faster.", _backedTextInput.text, (long long)eventLag);
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}
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}
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#pragma mark - RCTBackedTextInputDelegate
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- (BOOL)textInputShouldChangeTextInRange:(NSRange)range replacementText:(NSString *)string
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{
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// Only allow single keypresses for `onKeyPress`, pasted text will not be sent.
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if (!_backedTextInput.textWasPasted) {
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[self sendKeyValueForString:string];
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}
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if (_maxLength != nil && ![string isEqualToString:@"\n"]) { // Make sure forms can be submitted via return.
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NSUInteger allowedLength = _maxLength.integerValue - MIN(_maxLength.integerValue, _backedTextInput.text.length) + range.length;
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if (string.length > allowedLength) {
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if (string.length > 1) {
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// Truncate the input string so the result is exactly `maxLength`.
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NSString *limitedString = [string substringToIndex:allowedLength];
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NSMutableString *newString = _backedTextInput.text.mutableCopy;
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[newString replaceCharactersInRange:range withString:limitedString];
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_backedTextInput.text = newString;
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// Collapse selection at end of insert to match normal paste behavior.
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UITextPosition *insertEnd = [_backedTextInput positionFromPosition:_backedTextInput.beginningOfDocument
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offset:(range.location + allowedLength)];
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[_backedTextInput setSelectedTextRange:[_backedTextInput textRangeFromPosition:insertEnd toPosition:insertEnd]
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notifyDelegate:YES];
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[self textInputDidChange];
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}
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return NO;
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}
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}
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return YES;
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}
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- (void)textInputDidChange
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{
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_nativeEventCount++;
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[_eventDispatcher sendTextEventWithType:RCTTextEventTypeChange
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reactTag:self.reactTag
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text:_backedTextInput.text
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key:nil
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eventCount:_nativeEventCount];
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}
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@end
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