c# - 无法将C++中的TextBox_TextChanged()转换为C#

我使用Juce Library开发C++已有几个月。我在项目中编写了一个代码，其中文本框的格式被修改为仅具有一些功能的十六进制值:

演示:

12 ab 32 a5 64

现在，如果我的光标位于末尾，并且我继续按Backspace键，它将删除一般文本框中出现的值。

现在，如果我的光标位于a5的开头，并且我按了“删除键”，则该值应变为:

12 ab 32 56 4

如果我的光标位于a5的末尾，并且我按了'delete键'，则什么也不会发生。在输入值时，空格键不应让bw的两个值隔开。只能输入a-f和0-9。

这里的C++代码:

void CMSP430CommPanel::textEditorTextChanged (TextEditor& editor)
{

if(&editor == m_texti2cWrite)
{
int count = 0;
int location;

String text1 = m_texti2cWrite->getText();
String text = m_texti2cWrite->getText().removeCharacters(" ");
String hexString = String::empty;
int countCaret = m_texti2cWrite->getCaretPosition();

    for(int i=0; i < text.length(); i++)
    {
        hexString = hexString + String (&text[i], 1);
        if((i+1) % 2 == 0)
        {
            if(i != text.length()-1)
            {
                hexString = hexString + T(" ");
                count ++;
            }
        }
        count ++;
    }

    m_texti2cWrite->setText(hexString,false);

    if(text1.length() == m_texti2cWrite->getCaretPosition())
    {
        m_texti2cWrite->setCaretPosition(count);
    }
    else
    {
        m_texti2cWrite->setCaretPosition(countCaret);
    }
}
}

我希望同一件事在我的WPF应用程序中工作。可以说C#中相同代码的一般实现。

请帮忙!!!

最佳答案

尝试以下操作(您的TextBox的TextChanged-Event):

    private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
    {
        TextBox m_texti2cWrite = (TextBox)sender;
        int count = 0;

        string text1 = m_texti2cWrite.Text;
        string text = m_texti2cWrite.Text.Replace(" ", string.Empty);
        string hexString = string.Empty;
        int countCaret = e.Changes.ToList()[0].Offset;

        for (int i = 0; i < text.Length; i++)
        {
            hexString += text[i];
            if ((i + 1) % 2 == 0)
            {
                if (i != text.Length - 1)
                {
                    hexString = hexString + " ";
                    count++;
                }
            }
            count++;
        }

        m_texti2cWrite.Text = hexString;
        if (text1.Length == countCaret)
        {
            m_texti2cWrite.Select(count, 0);
        }
        else
        {
            if (e.Changes.ToList()[0].RemovedLength == 0)
            {
                m_texti2cWrite.Select(countCaret + 1, 0);
                if (string.IsNullOrWhiteSpace(hexString.Substring(countCaret, 1)))
                    m_texti2cWrite.Select(countCaret + 2, 0);
            }
            else
            {
                m_texti2cWrite.Select(countCaret, 0);
                if (string.IsNullOrWhiteSpace(hexString.Substring(countCaret, 1)))
                    m_texti2cWrite.Select(countCaret + 1, 0);
            }
        }
    }
}

编辑(仅接受数字，控制键或a-f):

添加此方法:

private Boolean IsTextAllowed(String text)
{
    string acceptedChars = "ABCDEFabcdef";
    foreach (Char c in text.ToCharArray())
    {
        if (Char.IsDigit(c) || Char.IsControl(c) || acceptedChars.Contains(c)) continue;
        else return false;
    }
    return true;
}

将TextBox_PreviewTextInput-Event添加到您的TextBox

private void TextBox_PreviewTextInput(object sender, TextCompositionEventArgs e)
{
    e.Handled = !IsTextAllowed(e.Text);
}