Question

当用户在富文本框中写入某些单词时，如果该单词与某个特定单词匹配，则该单词的颜色应自动更改。

当用户点击该特定彩色文本时，它应该引发一个事件。

Answer 1

1）用户在RichTextBox中插入一些文本    2）如果输入的任何单词是预定义单词列表的一部分，则该单词应更改颜色（定义与每个单词相关的颜色。
    3）在彩色字上生成鼠标点击事件时，会引发事件。

可能的结果：

使用自定义EventArgs定义自定义EventHandler：

public class WordsEventArgs : EventArgs
{
    private string word;
    public WordsEventArgs(string s) { word = s; }
    public string Word { get { return word; } set { word = value; } }
}

public delegate void WordsEventHandler(object sender, WordsEventArgs e);
public event WordsEventHandler WordClicked;

protected void OnWordClicked(WordsEventArgs e) => WordClicked?.Invoke(this, e);

订阅活动：

this.WordClicked += new WordsEventHandler(this.Word_Click);

单词列表的简单类：

public class ColoredWord
{
    public string Word { get; set; }
    public Color WordColor { get; set; }
}

public List<ColoredWord> ColoredWords = new List<ColoredWord>();

在列表中填入一些相关颜色的单词，然后将其绑定到列表框：

FillColoredWords();

public void FillColoredWords()
{
    ColoredWords.Add(new ColoredWord { Word = "SIMPLE", WordColor = Color.Goldenrod });
    ColoredWords.Add(new ColoredWord { Word = "COLORED", WordColor = Color.Salmon });
    ColoredWords.Add(new ColoredWord { Word = "TEXT", WordColor = Color.DarkCyan });
    this.listBox1.DisplayMember = "Word";
    this.listBox1.DataSource = ColoredWords;
}

在richTextBox1.KeyPress()事件中，评估最后输入的字词是否为要着色的字词列表的一部分：

private void richTextBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    int CurrentPosition = richTextBox1.SelectionStart;
    if (e.KeyChar == (char)Keys.Space && CurrentPosition > 0 && richTextBox1.Text.Length > 1)
    {
        int LastSpacePos = richTextBox1.Text.LastIndexOf((char)Keys.Space, CurrentPosition - 1);
        LastSpacePos = LastSpacePos > -1 ? LastSpacePos + 1 : 0;

        string LastWord = richTextBox1.Text.Substring(LastSpacePos, CurrentPosition - (LastSpacePos));
        ColoredWord result = ColoredWords.FirstOrDefault(s => s.Word == LastWord.ToUpper());

        richTextBox1.Select(LastSpacePos, CurrentPosition - LastSpacePos);
        if (result != null)
        {
            if (richTextBox1.SelectionColor != result.WordColor)
                richTextBox1.SelectionColor = result.WordColor;
        }
        else
        {
            if (richTextBox1.SelectionColor != richTextBox1.ForeColor)
                richTextBox1.SelectionColor = richTextBox1.ForeColor;
        }
        richTextBox1.SelectionStart = CurrentPosition;
        richTextBox1.SelectionLength = 0;
        richTextBox1.SelectionColor = richTextBox1.ForeColor;
    }
}

在richTextBox1_MouseClick()事件中，验证是否在彩色字词上生成了点击。
如果是，请举起自定义OnWordClicked()事件：

private void richTextBox1_MouseClick(object sender, MouseEventArgs e)
{
    if (richTextBox1.SelectionColor.ToArgb() != richTextBox1.ForeColor.ToArgb())
    {
        try
        {
            int WordInit = richTextBox1.Text.LastIndexOf((char)32, richTextBox1.SelectionStart);
            WordInit = WordInit > -1 ? WordInit : 0;
            int WordEnd = richTextBox1.Text.IndexOf((char)32, richTextBox1.SelectionStart);
            string WordClicked = richTextBox1.Text.Substring(WordInit, WordEnd - WordInit) + Environment.NewLine;
            OnWordClicked(new WordsEventArgs(WordClicked));
        }
        catch (Exception)
        {
            //Handle a fast doublelick: RTB is a bit dumb.
            //Handle a word auto-selection that changes the `.SelectionStart` value
        }
    }
}

在自定义事件中，将单击的单词添加到文本框文本中：

private void Word_Click(object sender, WordsEventArgs e)
{
    textBox1.AppendText(e.Word);
}

Answer 2

首先将更改的事件添加到您的富文本框文本中你需要改变文本的颜色，如果这是一个特定的词，例如：Munis，Ali

   private void Rchtxt_TextChanged(object sender, EventArgs e)
            {
                this.CheckKeyword("Munis", Color.Purple, 0);
                this.CheckKeyword("Ali", Color.Green, 0);
            }

如何在用户编写时在RichTextBox中为不同颜色的不同单词着色，并在单击该彩色文本时引发事件

2 个答案: