在 RichTextBox 中选择单词时如何显示面板? [英] How do I display a Panel when selecting a word in a RichTextBox?

问题描述

当我在 RichTextBox 中选择或双击一个词时，一个面板应该出现在这个词上方(这个 panel 最初是隐藏并在突出显示单词时出现).当我删除选择时，panel 应该消失.

When I select or double-click on a word in the RichTextBox, a panel should appear above this word (This panel is initially hidden and appears when the word is highlighted). When I remove the selection, the panel should disappear.

private void richTextBox1_SelectionChanged(object sender, EventArgs e)
{
    if (richTextBox1.SelectedText.Length > 0)
       panel1.Visible = true;
    else
       panel1.Visible = false;
}

推荐答案

根据您的更改，您需要一个自定义控件来实现此目的.为此设置您的自定义位置，另一个问题可能是您的 Control(此处:buttonOverlay)的 z-index(优先级).使用buttonOverlay.BringToFront()，您将把它设置在最前面.

According to your changes, you need a custom control to achieve this. Set your custom location for that, another problem might be the z-index (priority) of your Control (here: buttonOverlay). With buttonOverlay.BringToFront(), you'll set it to the front.

private void richTextBox1_SelectionChanged(object sender, EventArgs e)
{
    if (richTextBox1.SelectedText.Length > 0)
    {
        Point relativePoint = rTxtBxSelectionTester.GetPositionFromCharIndex(rTxtBxSelectionTester.SelectionStart);
        int txtBsPosX = relativePoint.X + rTxtBxSelectionTester.Location.X; 
        int txtBxPosY = relativePoint.Y + rTxtBxSelectionTester.Location.Y - this.buttonOverlay.Size.Height; 
        relativePoint = new Point(txtBsPosX, txtBxPosY);
        this.buttonOverlay.Location = relativePoint;
        this.buttonOverlay.Visible = true;
        this.buttonOverlay.BringToFront();          
    }
    else
    {
        this.buttonOverlay.Visible = false;
    }
}

要添加自定义 Control，请将以下代码添加到您的 Form 构造函数中:

To add the custom Control add the following code to your Form constructor:

this.buttonOverlay = new FormattingOverlay(this);
this.Controls.Add(this.buttonOverlay);
this.buttonOverlay.Visible = false;`

FormattingOverlay是一个继承自UserControl的类:

public partial class FormattingOverlay : UserControl
{

    public FormattingOverlay(Form1 mainForm)
    {
        this.mainForm = mainForm;
        InitializeComponent();
    }

    private void btnBold_Click(object sender, EventArgs e)
    {
        RichTextBox rTxtBx = mainForm.rTxtBxSelectionTester;
        rTxtBx.SelectionFont = new Font(rTxtBx.Font, FontStyle.Bold);
        rTxtBx.SelectionStart = rTxtBx.SelectionStart + rTxtBx.SelectionLength;
        rTxtBx.SelectionLength = 0;
        rTxtBx.SelectionFont = rTxtBx.Font;
    }
}

可以通过此链接找到整个示例项目.

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