鉴于要求:
1)用户在 RichTextBox 控件中插入一些文本。
2)如果输入的单词是预定义单词列表的一部分,则该单词应该改变颜色(因此,定义单词和颜色之间的关系)。
3)当在彩色单词上生成鼠标单击事件时,会引发一个事件,以通知单击了哪个单词。
可能的结果(复制视觉示例中的内容):
使用自定义 EventArgs 定义自定义 EventHandler:
public class WordsEventArgs : EventArgs
{
private string m_word;
public WordsEventArgs(string word) { m_word = word; }
public string Word { get { return m_word; } set { m_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>();
用一些相关颜色的单词填充列表,然后将其绑定到 ListBox,调用FillColoredWords()
方法(换句话说,处理将文本片段与颜色值相关联的对象集合):
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;
}
In the KeyPress
事件,评估最后输入的单词是否是要着色的单词列表的一部分:
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;
}
}
In the MouseClick
事件,验证事件是否是在彩色单词上生成的。
在这种情况下,请提高习惯OnWordClicked()
event:
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 DoubleClick: RTB is a bit dumb.
//Handle a word auto-selection that changes the `.SelectionStart` value
}
}
}
在自定义事件中,您可以将单击的单词附加到文本框(或执行您想要对其执行的任何其他操作):
private void Word_Click(object sender, WordsEventArgs e)
{
textBox1.AppendText(e.Word);
}