Question

在C＃迷你应用程序中，我有一个按钮，我想通过右键单击来启用和禁用它。也就是说，当通过右键单击启用按钮时，它将变为禁用；当禁用按钮时，右键单击将其状态更改为启用。禁用已启用的按钮非常简单明了，但是无法通过右键单击启用它；因为该按钮已禁用，并且没有将事件发送到无效代码。我该怎么办？

Answer 1

已禁用控件的鼠标事件将向下传递到其Parent。

您可以在那里找到它们并测试光标是否在按钮上。

示例：

if (button1.Bounds.Contains(e.Location)) button1.Enabled = true;

如果有几个按钮，则需要全部测试。.

private void panel1_MouseDown(object sender, MouseEventArgs e)
{
    foreach (Control ctl in panel1.Controls)
    {
        if (ctl is Button && ctl.Bounds.Contains(e.Location)) 
            ctl.Enabled = true;
    } 
}

如果仅应启用鼠标右键，则可以为此添加一个测试：

if (e.Button.HasFlag(MouseButtons.Right) && 
    ctl is Button && ctl.Bounds.Contains(e.Location))

Answer 2

右键单击以启用和禁用按钮不是标准或推荐的按钮行为，因此API完全没有为它提供简单的实现。禁用按钮后，它将不再捕获鼠标事件，但表单会捕获鼠标事件。

public partial class Form1 : Form
{
    private Boolean _button1IsRightClicked;
    public Form1()
    {
        InitializeComponent();
        _button1IsRightClicked = false;
    }

    private void button1_Click(object sender, EventArgs e)
    {
        MessageBox.Show("Hi");
    }

    private void Form1_MouseDown(object sender, MouseEventArgs e)
    {
        if (e.X >= button1.Location.X && e.X <= (button1.Location.X + button1.Width) &&
            e.Y >= button1.Location.Y && e.Y <= (button1.Location.Y + button1.Height))
        {
            _button1IsRightClicked = true;
        }
        else
        {
            _button1IsRightClicked = false;
        }
    }

    private void Form1_MouseUp(object sender, MouseEventArgs e)
    {
        if (e.X >= button1.Location.X && e.X <= (button1.Location.X + button1.Width) &&
            e.Y >= button1.Location.Y && e.Y <= (button1.Location.Y + button1.Height))
        {
            _button1IsRightClicked = false;
            enableDisableButton1(button1.Enabled);
        }
        else
        {
            _button1IsRightClicked = false;
        }
    }

    private void enableDisableButton1(Boolean isEnabled)
    {
        if (isEnabled)
        {
            button1.Enabled = false;
            isEnabled = false;
        }else
        {
            button1.Enabled = true;
            isEnabled = true;
        }
    }

    private void button1_MouseDown(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Right)
        {
            _button1IsRightClicked = true;
        }
        else
        {
            _button1IsRightClicked = false;
        }
    }

    private void button1_MouseUp(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Right && _button1IsRightClicked == true)
        {
            _button1IsRightClicked = false;
            enableDisableButton1(button1.Enabled);
        }
        else
        {
            _button1IsRightClicked = false;
        }
    }
}

如何在C＃表单中右键单击禁用的按钮来启用它？

2 个答案: