MiMO_iOS/MiMoLive/TUIKit/TUIChat/UI_Classic/Input/TUIResponderTextView.m

//
//  TResponderTextView.m
//  TUIKit
//
//  Created by kennethmiao on 2018/10/25.
//  Copyright © 2018 Tencent. All rights reserved.
//

#import "TUIResponderTextView.h"
#import <TIMCommon/NSString+TUIEmoji.h>

@interface TUIResponderTextView ()
@property (nonatomic ,strong) UILabel *placeHolderLabel;
@end

@implementation TUIResponderTextView

- (instancetype)init {
    self = [super init];
    if (self) {
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(didReceiveTextDidChangeNotification:)
                                                     name:UITextViewTextDidChangeNotification
                                                   object:self];
        [self placeAndLayoutSubviews];
    }
    return self;
}

- (void)placeAndLayoutSubviews {
    [self addSubview:self.placeHolderLabel];
    [self.placeHolderLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self).offset(7.0);
        make.left.equalTo(self).offset(14.0);
        make.right.equalTo(self).offset(-14.0);
    }];
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UITextViewTextDidChangeNotification object:self];
}

#pragma mark - Notifications
- (void)didReceiveTextDidChangeNotification:(NSNotification *)notification {
    self.placeHolderLabel.hidden = self.text.length > 0 ? YES : NO;
}

#pragma mark getter and setter
- (UILabel *)placeHolderLabel {
    if (_placeHolderLabel == nil) {
        _placeHolderLabel = [[UILabel alloc] init];
        _placeHolderLabel.font = self.font;
        _placeHolderLabel.textColor = [UIColor lightGrayColor];
        _placeHolderLabel.textAlignment = NSTextAlignmentLeft;
        _placeHolderLabel.lineBreakMode = NSLineBreakByTruncatingTail;
    }
    return _placeHolderLabel;
}

- (void)setPlaceHolder:(NSString *)placeHolder {
    _placeHolder = placeHolder;
    self.placeHolderLabel.text = _placeHolder;
}

- (void)setPlaceHolderColor:(UIColor *)placeHolderColor {
    _placeHolderColor = placeHolderColor;
    self.placeHolderLabel.textColor = _placeHolderColor;
}

- (UIResponder *)nextResponder {
    if (_overrideNextResponder == nil) {
        return [super nextResponder];
    } else {
        return _overrideNextResponder;
    }
}

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
    if (_overrideNextResponder != nil)
        return NO;
    else
        return [super canPerformAction:action withSender:sender];
}

- (void)buildMenuWithBuilder:(id<UIMenuBuilder>)builder API_AVAILABLE(ios(13.0)) {
    if (@available(iOS 16.0, *)) {
        [builder removeMenuForIdentifier:UIMenuLookup];
    }
    [super buildMenuWithBuilder:builder];
}

- (void)deleteBackward {
    id<TUIResponderTextViewDelegate> delegate = (id<TUIResponderTextViewDelegate>)self.delegate;

    if ([delegate respondsToSelector:@selector(onDeleteBackward:)]) {
        [delegate onDeleteBackward:self];
    }

    [super deleteBackward];
}

- (void)setText:(NSString *)text {
    [super setText:text];
    if (self.delegate && [self.delegate respondsToSelector:@selector(textViewDidChange:)]) {
        [self.delegate textViewDidChange:self];
    }
}

- (void)copy:(__unused id)sender {
    UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
    pasteboard.string = [[self.textStorage attributedSubstringFromRange:self.selectedRange] tui_getPlainString];
}

- (void)cut:(nullable id)sender {
    UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
    pasteboard.string = [[self.textStorage attributedSubstringFromRange:self.selectedRange] tui_getPlainString];
    UIFont *textFont = [UIFont systemFontOfSize:16.0];
    NSAttributedString *spaceString = [[NSAttributedString alloc] initWithString:@"" attributes:@{NSFontAttributeName : textFont}];
    [self.textStorage replaceCharactersInRange:self.selectedRange withAttributedString:spaceString];
}

@end