请问如何实现 KeyCodes.BACKSPACE 键的回退删除一个字符或表情？ #104

eronakoto · 2020-12-02T14:37:46Z

String new_text = text.substring(0, text.length - 1);
e_text_editing_controller.value = te_value.copyWith(
text: new_text,
selection: te_value.selection.copyWith(
baseOffset: start,
extentOffset: start
)
);
我写了一个回退删除的函数，但是和我写的EmojiText起了冲突，因为看起来是一个图标，其实actualText的值为:[微笑]
这样就会导致删除的是一个 "]"符号，而没有删除一个EmojiText

我试着去找了一些能够发送键盘指令的代码，但也是一头雾水（不知道如何使用）
BasicMessageChannel keyEvent = BasicMessageChannel(
'flutter/keyevent',
JSONMessageCodec(),
);
keyEvent.send(KeyCodes.BACKSPACE);

zmtzawqlp · 2020-12-03T04:58:34Z

extended_text_field/example/lib/pages/complex/text_demo.dart

Line 379 in 8026bcb

final TextEditingValue _value = _textEditingController.value;

Xiaobai-1024 · 2021-08-21T07:14:25Z

extended_text_field/example/lib/pages/complex/text_demo.dart

Line 379 in 8026bcb

final TextEditingValue _value = _textEditingController.value;

用这个方法删除emoji，控件会报错

lifelikejuly · 2023-07-31T06:32:18Z

extended_text_field/example/lib/pages/complex/text_demo.dart

Line 379 in 8026bcb

final TextEditingValue _value = _textEditingController.value;

这个方法对于删除emoji也是有问题的，如果字符串全部都是emoji的话需要删除两次才能正确展示删除后的字符

zmtzawqlp · 2023-07-31T07:03:27Z

extended_text_field/example/lib/pages/complex/text_demo.dart

Line 379 in 8026bcb

final TextEditingValue _value = _textEditingController.value;

这个方法对于删除emoji也是有问题的，如果字符串全部都是emoji的话需要删除两次才能正确展示删除后的字符

demo 会出现这个问题吗？

lifelikejuly · 2023-07-31T08:48:56Z

extended_text_field/example/lib/pages/complex/text_demo.dart

Line 379 in 8026bcb

final TextEditingValue _value = _textEditingController.value;

这个方法对于删除emoji也是有问题的，如果字符串全部都是emoji的话需要删除两次才能正确展示删除后的字符

demo 会出现这个问题吗？

是的
输入内容文本：🐶🐰🐼🦁🐸🙉
错误信息如下

 ======== Exception caught by painting library ======================================================
The following ArgumentError was thrown while building a TextSpan:
Invalid argument(s): string is not well-formed UTF-16

When the exception was thrown, this was the stack: 
#0      ParagraphBuilder.addText (dart:ui/text.dart:3130:7)
#1      TextSpan.build (package:flutter/src/painting/text_span.dart:280:17)
#2      TextSpan.build (package:flutter/src/painting/text_span.dart:294:15)
#3      TextPainter._createParagraph (package:flutter/src/painting/text_painter.dart:895:10)
#4      TextPainter.layout (package:flutter/src/painting/text_painter.dart:946:7)
#5      _RenderEditable._layoutText (package:extended_text_field/src/official/rendering/editable.dart:2362:18)
#6      _RenderEditable._computeTextMetricsIfNeeded (package:extended_text_field/src/official/rendering/editable.dart:2390:5)
#7      _RenderEditable.performLayout (package:extended_text_field/src/official/rendering/editable.dart:2476:5)
#8      RenderObject.layout (package:flutter/src/rendering/object.dart:2395:7)
#9      RenderBox.layout (package:flutter/src/rendering/box.dart:2386:11)
#10     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:122:14)
#11     RenderObject.layout (package:flutter/src/rendering/object.dart:2395:7)
#12     RenderBox.layout (package:flutter/src/rendering/box.dart:2386:11)
#13     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:122:14)
#14     RenderLeaderLayer.performLayout (package:flutter/src/rendering/proxy_box.dart:4724:11)
#15     RenderObject.layout (package:flutter/src/rendering/object.dart:2395:7)
#16     RenderBox.layout (package:flutter/src/rendering/box.dart:2386:11)
#17     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:122:14)
#18     RenderObject.layout (package:flutter/src/rendering/object.dart:2395:7)
#19     RenderBox.layout (package:flutter/src/rendering/box.dart:2386:11)
#20     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:122:14)
#21     RenderObject.layout (package:flutter/src/rendering/object.dart:2395:7)
#22     RenderBox.layout (package:flutter/src/rendering/box.dart:2386:11)
#23     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:122:14)
#24     RenderObject.layout (package:flutter/src/rendering/object.dart:2395:7)
#25     RenderBox.layout (package:flutter/src/rendering/box.dart:2386:11)
#26     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:122:14)
#27     RenderObject.layout (package:flutter/src/rendering/object.dart:2395:7)
#28     RenderBox.layout (package:flutter/src/rendering/box.dart:2386:11)
#29     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:122:14)
#30     RenderObject.layout (package:flutter/src/rendering/object.dart:2395:7)
#31     RenderBox.layout (package:flutter/src/rendering/box.dart:2386:11)
#32     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:122:14)
#33     RenderObject.layout (package:flutter/src/rendering/object.dart:2395:7)
#34     RenderBox.layout (package:flutter/src/rendering/box.dart:2386:11)
#35     RenderTapRegion.layout (package:flutter/src/widgets/tap_region.dart:519:11)
#36     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:122:14)
#37     RenderObject.layout (package:flutter/src/rendering/object.dart:2395:7)
#38     RenderBox.layout (package:flutter/src/rendering/box.dart:2386:11)
#39     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:122:14)
#40     RenderObject.layout (package:flutter/src/rendering/object.dart:2395:7)
#41     RenderBox.layout (package:flutter/src/rendering/box.dart:2386:11)
#42     _RenderDecoration._layoutLineBox (package:flutter/src/material/input_decorator.dart:909:9)
#43     _RenderDecoration._layout (package:flutter/src/material/input_decorator.dart:1031:28)
#44     _RenderDecoration.performLayout (package:flutter/src/material/input_decorator.dart:1350:44)
#45     RenderObject.layout (package:flutter/src/rendering/object.dart:2395:7)
#46     RenderBox.layout (package:flutter/src/rendering/box.dart:2386:11)
#47     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:122:14)
#48     RenderObject.layout (package:flutter/src/rendering/object.dart:2395:7)
#49     RenderBox.layout (package:flutter/src/rendering/box.dart:2386:11)
#50     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:122:14)
#51     RenderObject.layout (package:flutter/src/rendering/object.dart:2395:7)
#52     RenderBox.layout (package:flutter/src/rendering/box.dart:2386:11)
#53     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:122:14)
#54     RenderObject.layout (package:flutter/src/rendering/object.dart:2395:7)
#55     RenderBox.layout (package:flutter/src/rendering/box.dart:2386:11)
#56     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:122:14)
#57     RenderObject.layout (package:flutter/src/rendering/object.dart:2395:7)
#58     RenderBox.layout (package:flutter/src/rendering/box.dart:2386:11)
#59     RenderTapRegion.layout (package:flutter/src/widgets/tap_region.dart:519:11)
#60     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:122:14)
#61     RenderObject.layout (package:flutter/src/rendering/object.dart:2395:7)
#62     RenderBox.layout (package:flutter/src/rendering/box.dart:2386:11)
#63     ChildLayoutHelper.layoutChild (package:flutter/src/rendering/layout_helper.dart:52:11)
#64     RenderFlex._computeSizes (package:flutter/src/rendering/flex.dart:808:43)
#65     RenderFlex.performLayout (package:flutter/src/rendering/flex.dart:903:32)
#66     RenderObject.layout (package:flutter/src/rendering/object.dart:2395:7)
#67     RenderBox.layout (package:flutter/src/rendering/box.dart:2386:11)
#68     MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:171:12)
#69     _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:1056:7)
#70     MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:235:7)
#71     RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:403:14)
#72     RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:2234:7)
#73     PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:1016:18)
#74     RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:492:19)
#75     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:905:13)
#76     RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:358:5)
#77     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1284:15)
#78     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1214:9)
#79     SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1072:5)
#80     _invoke (dart:ui/hooks.dart:142:13)
#81     PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:359:5)
#82     _drawFrame (dart:ui/hooks.dart:112:31)
====================================================================================================

lifelikejuly · 2023-07-31T08:56:37Z

extended_text_field/example/lib/pages/complex/text_demo.dart

Line 379 in 8026bcb

final TextEditingValue _value = _textEditingController.value;

这个方法对于删除emoji也是有问题的，如果字符串全部都是emoji的话需要删除两次才能正确展示删除后的字符

demo 会出现这个问题吗？

video: https://www.youtube.com/shorts/Iu8E3BhSzS8

zmtzawqlp · 2023-07-31T09:00:51Z

extended_text_field/example/lib/pages/complex/text_demo.dart

Line 379 in 8026bcb

final TextEditingValue _value = _textEditingController.value;

这个方法对于删除emoji也是有问题的，如果字符串全部都是emoji的话需要删除两次才能正确展示删除后的字符

demo 会出现这个问题吗？

video: https://www.youtube.com/shorts/Iu8E3BhSzS8

你这个是emoji 呀。。不是你自己定义的表情文字。。也用不上这个实现。

zmtzawqlp · 2023-07-31T09:02:58Z

首先，issue 的作者，是因为自定义的表情文字。没有设置deleteall，才会键盘默认删除不能删掉整个
emoji 不需要用代码去删除

lifelikejuly · 2023-07-31T09:06:01Z

首先，issue 的作者，是因为自定义的表情文字。没有设置deleteall，才会键盘默认删除不能删掉整个

emoji 不需要用代码去删除

实际使用场景是无键盘情况下想实现一个删除键，发现删除emoji就不适用了

zmtzawqlp · 2023-07-31T09:29:19Z

首先，issue 的作者，是因为自定义的表情文字。没有设置deleteall，才会键盘默认删除不能删掉整个

emoji 不需要用代码去删除

实际使用场景是无键盘情况下想实现一个删除键，发现删除emoji就不适用了

emoji 是特殊的字符，请参考 dart-lang/sdk#35798 自行处理

zmtzawqlp · 2023-07-31T09:30:36Z

我在 extended_text 里面也处理过这个问题 fluttercandies/extended_text@c4c4969

lifelikejuly · 2023-07-31T09:43:35Z

我在 extended_text 里面也处理过这个问题 fluttercandies/extended_text@c4c4969

😎

lifelikejuly · 2023-07-31T09:45:36Z

我在 extended_text 里面也处理过这个问题 fluttercandies/extended_text@c4c4969

原本我想的是通过参考Runes:last方法来处理

  int get last {
    if (string.length == 0) {
      throw StateError('No elements.');
    }
    int length = string.length;
    int code = string.codeUnitAt(length - 1);
    if (_isTrailSurrogate(code) && string.length > 1) {
      int previousCode = string.codeUnitAt(length - 2);
      if (_isLeadSurrogate(previousCode)) { // 判断是否是UTF-16
        return _combineSurrogatePair(previousCode, code);
      }
    }
    return code;
  }

正常删除emoji代码


  // Is then code (a 16-bit unsigned integer) a UTF-16 lead surrogate.
  bool _isLeadSurrogate(int code) => (code & 0xFC00) == 0xD800;

  // Is then code (a 16-bit unsigned integer) a UTF-16 trail surrogate.
  bool _isTrailSurrogate(int code) => (code & 0xFC00) == 0xDC00;


  int checkCode(String content, [int index = 0]) {
    int code = content.codeUnitAt(index);
    if (_isTrailSurrogate(code) && content.length > 1 && index >= 1) {
      int previousCode = content.codeUnitAt(index - 1);
      if (_isLeadSurrogate(previousCode)) {
        return 2;
      }
    }
    return 1;
  }

  void manualDelete() {
    //delete by code
    final TextEditingValue _value = _textEditingController.value;
    final TextSelection selection = _value.selection;
    if (!selection.isValid) {
      return;
    }

    TextEditingValue value;
    final String actualText = _value.text;
    if (selection.isCollapsed && selection.start == 0) {
      return;
    }
    final int start =
    selection.isCollapsed ? selection.start - 1 : selection.start;
    final int end = selection.end;
    if(checkCode(actualText,end - 1) > 1){
      start --;
    }
    value = TextEditingValue(
      text: actualText.replaceRange(start, end, ''),
      selection: TextSelection.collapsed(offset: start),
    );

    final TextSpan oldTextSpan = _mySpecialTextSpanBuilder.build(_value.text);

    value = handleSpecialTextSpanDelete(value, _value, oldTextSpan, null);

    _textEditingController.value = value;
  }

zmtzawqlp · 2023-07-31T09:59:55Z

我在 extended_text 里面也处理过这个问题 fluttercandies/extended_text@c4c4969

原本我想的是通过参考Runes:last方法来处理

  int get last {
    if (string.length == 0) {
      throw StateError('No elements.');
    }
    int length = string.length;
    int code = string.codeUnitAt(length - 1);
    if (_isTrailSurrogate(code) && string.length > 1) {
      int previousCode = string.codeUnitAt(length - 2);
      if (_isLeadSurrogate(previousCode)) { // 判断是否是UTF-16
        return _combineSurrogatePair(previousCode, code);
      }
    }
    return code;
  }

正常删除emoji代码


  // Is then code (a 16-bit unsigned integer) a UTF-16 lead surrogate.
  bool _isLeadSurrogate(int code) => (code & 0xFC00) == 0xD800;

  // Is then code (a 16-bit unsigned integer) a UTF-16 trail surrogate.
  bool _isTrailSurrogate(int code) => (code & 0xFC00) == 0xDC00;


  int checkCode(String content, [int index = 0]) {
    int code = content.codeUnitAt(index);
    if (_isTrailSurrogate(code) && content.length > 1 && index >= 1) {
      int previousCode = content.codeUnitAt(index - 1);
      if (_isLeadSurrogate(previousCode)) {
        return 2;
      }
    }
    return 1;
  }

  void manualDelete() {
    //delete by code
    final TextEditingValue _value = _textEditingController.value;
    final TextSelection selection = _value.selection;
    if (!selection.isValid) {
      return;
    }

    TextEditingValue value;
    final String actualText = _value.text;
    if (selection.isCollapsed && selection.start == 0) {
      return;
    }
    final int start =
    selection.isCollapsed ? selection.start - 1 : selection.start;
    final int end = selection.end;
    if(checkCode(actualText,end - 1) > 1){
      start --;
    }
    value = TextEditingValue(
      text: actualText.replaceRange(start, end, ''),
      selection: TextSelection.collapsed(offset: start),
    );

    final TextSpan oldTextSpan = _mySpecialTextSpanBuilder.build(_value.text);

    value = handleSpecialTextSpanDelete(value, _value, oldTextSpan, null);

    _textEditingController.value = value;
  }

空了可以pr下

eronakoto · 2023-07-31T10:08:55Z

@zmtzawqlp @Xiaobai-1024 @lifelikejuly
各位实在对不住搞忘来结贴了，这个问题我之前已经解决了。我也用了一些不靠谱的方式来解决。就是没有使用继承复写。
1.
自定义了 Class ExtendedEditableText 的
///build your ccustom text span
final CXSpecialTextSpanBuilder specialTextSpanBuilder;

2.自定义

import 'package:extended_text/extended_text.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_cim/plugins/ExtendText/EmojiText.dart';
import 'package:flutter_cim/plugins/ExtendText/ImageText.dart';

class CXSpecialTextSpanBuilder extends SpecialTextSpanBuilder {
  CXSpecialTextSpanBuilder({this.showAtBackground = false});

  /// whether show background for @somebody
  final bool showAtBackground;
  @override
  TextSpan build(String data, {TextStyle? textStyle, SpecialTextGestureTapCallback? onTap}) {
    if (kIsWeb || data == null || data == '') {
      return TextSpan(text: data, style: textStyle);
    }
    /*---*/
    final List<InlineSpan> inlineList = <InlineSpan>[];
    if (data.isNotEmpty) {
      SpecialText? specialText;
      String textStack = '';
      //String text
      for (int i = 0; i < data.length; i++) {
        final String char = data[i];
        textStack += char;
        if (specialText != null) {
          if (!specialText.isEnd(textStack)) {
            specialText.appendContent(char);
          } else {
            inlineList.add(specialText.finishText());
            specialText = null;
            textStack = '';
          }
        } else {
          specialText = createSpecialText(textStack, textStyle: textStyle!, onTap: onTap!, index: i, data: data);
          if (specialText != null) {
            if (textStack.length - specialText.startFlag.length >= 0) {
              textStack = textStack.substring(0, textStack.length - specialText.startFlag.length);
              if (textStack.isNotEmpty) {
                inlineList.add(TextSpan(text: textStack, style: textStyle));
              }
            }
            textStack = '';
          }
        }
      }

      if (specialText != null) {
        inlineList.add(TextSpan(
            text: specialText.startFlag + specialText.getContent(),
            style: textStyle
        ));
      } else if (textStack.isNotEmpty) {
        inlineList.add(TextSpan(text: textStack, style: textStyle));
      }
    } else {
      inlineList.add(TextSpan(text: data, style: textStyle));
    }

    return TextSpan(children: inlineList, style: textStyle);
    return super.build(data, textStyle: textStyle, onTap: onTap);
  }

  @override
  SpecialText? createSpecialText(String flag, {TextStyle? textStyle, SpecialTextGestureTapCallback? onTap, int? index, String? data}) {
    SpecialText? st;
    if (flag == null || flag == '') {
      return st;
    }
    ///index is end index of start flag, so text start index should be index-(flag.length-1)
    if (isStart(flag, EmojiText.flag)) {
      EmojiText et = EmojiText(textStyle!, start: index! - (EmojiText.flag.length - 1), data: data!);
      if (et.validKey()) {
        return et;
      }
    } else if (isStart(flag, ImageText.flag)) {
      return ImageText(textStyle!, start: index! - (ImageText.flag.length - 1), onTap: onTap!);
    }
    return st;
  }
}
`

3.如果要使用函数触发删除，正如官方demo一样
`
void eManualDelete() {
    //delete by code
    final TextEditingValue _value = e_text_editing_controller!.value;
    final TextSelection selection = _value.selection;
    if (!selection.isValid) {
      return;
    }

    TextEditingValue value;
    final String actualText = _value.text;
    if (selection.isCollapsed && selection.start == 0) {
      return;
    }
    final int start = selection.isCollapsed ? selection.start - 1 : selection.start;
    final int end = selection.end;

    value = TextEditingValue(
      text: actualText.replaceRange(start, end, ''),
      selection: TextSelection.collapsed(offset: start),
    );

    final TextSpan oldTextSpan = cx_special_text_span_builder!.build(_value.text);

    value = handleSpecialTextSpanDelete(value, _value, oldTextSpan, null);

    e_text_editing_controller!.value = value;
    bottom_tool!.val_change(value.text);
  }

zmtzawqlp · 2023-08-01T03:26:33Z

@zmtzawqlp @Xiaobai-1024 @lifelikejuly 各位实在对不住搞忘来结贴了，这个问题我之前已经解决了。我也用了一些不靠谱的方式来解决。就是没有使用继承复写。 1. 自定义了 Class ExtendedEditableText 的 ///build your ccustom text span final CXSpecialTextSpanBuilder specialTextSpanBuilder;

2.自定义

import 'package:extended_text/extended_text.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_cim/plugins/ExtendText/EmojiText.dart';
import 'package:flutter_cim/plugins/ExtendText/ImageText.dart';

class CXSpecialTextSpanBuilder extends SpecialTextSpanBuilder {
  CXSpecialTextSpanBuilder({this.showAtBackground = false});

  /// whether show background for @somebody
  final bool showAtBackground;
  @override
  TextSpan build(String data, {TextStyle? textStyle, SpecialTextGestureTapCallback? onTap}) {
    if (kIsWeb || data == null || data == '') {
      return TextSpan(text: data, style: textStyle);
    }
    /*---*/
    final List<InlineSpan> inlineList = <InlineSpan>[];
    if (data.isNotEmpty) {
      SpecialText? specialText;
      String textStack = '';
      //String text
      for (int i = 0; i < data.length; i++) {
        final String char = data[i];
        textStack += char;
        if (specialText != null) {
          if (!specialText.isEnd(textStack)) {
            specialText.appendContent(char);
          } else {
            inlineList.add(specialText.finishText());
            specialText = null;
            textStack = '';
          }
        } else {
          specialText = createSpecialText(textStack, textStyle: textStyle!, onTap: onTap!, index: i, data: data);
          if (specialText != null) {
            if (textStack.length - specialText.startFlag.length >= 0) {
              textStack = textStack.substring(0, textStack.length - specialText.startFlag.length);
              if (textStack.isNotEmpty) {
                inlineList.add(TextSpan(text: textStack, style: textStyle));
              }
            }
            textStack = '';
          }
        }
      }

      if (specialText != null) {
        inlineList.add(TextSpan(
            text: specialText.startFlag + specialText.getContent(),
            style: textStyle
        ));
      } else if (textStack.isNotEmpty) {
        inlineList.add(TextSpan(text: textStack, style: textStyle));
      }
    } else {
      inlineList.add(TextSpan(text: data, style: textStyle));
    }

    return TextSpan(children: inlineList, style: textStyle);
    return super.build(data, textStyle: textStyle, onTap: onTap);
  }

  @override
  SpecialText? createSpecialText(String flag, {TextStyle? textStyle, SpecialTextGestureTapCallback? onTap, int? index, String? data}) {
    SpecialText? st;
    if (flag == null || flag == '') {
      return st;
    }
    ///index is end index of start flag, so text start index should be index-(flag.length-1)
    if (isStart(flag, EmojiText.flag)) {
      EmojiText et = EmojiText(textStyle!, start: index! - (EmojiText.flag.length - 1), data: data!);
      if (et.validKey()) {
        return et;
      }
    } else if (isStart(flag, ImageText.flag)) {
      return ImageText(textStyle!, start: index! - (ImageText.flag.length - 1), onTap: onTap!);
    }
    return st;
  }
}
`

3.如果要使用函数触发删除，正如官方demo一样
`
void eManualDelete() {
    //delete by code
    final TextEditingValue _value = e_text_editing_controller!.value;
    final TextSelection selection = _value.selection;
    if (!selection.isValid) {
      return;
    }

    TextEditingValue value;
    final String actualText = _value.text;
    if (selection.isCollapsed && selection.start == 0) {
      return;
    }
    final int start = selection.isCollapsed ? selection.start - 1 : selection.start;
    final int end = selection.end;

    value = TextEditingValue(
      text: actualText.replaceRange(start, end, ''),
      selection: TextSelection.collapsed(offset: start),
    );

    final TextSpan oldTextSpan = cx_special_text_span_builder!.build(_value.text);

    value = handleSpecialTextSpanDelete(value, _value, oldTextSpan, null);

    e_text_editing_controller!.value = value;
    bottom_tool!.val_change(value.text);
  }

你的问题应该是没有给 emoji text 加deleteall 等于 true

zmtzawqlp closed this as completed Dec 3, 2020

lifelikejuly mentioned this issue Jul 31, 2023

fix:【update Demo】manualDelete function support delete system emoji #219

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请问如何实现 KeyCodes.BACKSPACE 键的回退删除一个字符或表情？ #104

请问如何实现 KeyCodes.BACKSPACE 键的回退删除一个字符或表情？ #104

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zmtzawqlp commented Aug 1, 2023

请问如何实现 KeyCodes.BACKSPACE 键的回退删除一个字符或表情？ #104

请问如何实现 KeyCodes.BACKSPACE 键的回退删除一个字符或表情？ #104

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