通过鼠标移动控件

Question

我要用鼠标移动按钮,一切正常,但是当我在按钮窗口上移动鼠标时,按钮的左上方(左上角)将位于光标位置.

我不希望这种情况发生.我的代码中的错误在哪里？

private void button1_MouseDown(object sender, MouseEventArgs e)
{
    if (e.Button == System.Windows.Forms.MouseButtons.Left)
    {
        clicked = true;
    }

}

private void button1_MouseMove(object sender, MouseEventArgs e)
{
    if (clicked)
    {
        Point p = new Point();//in form coordinates
        p.X =  e.X + button1.Left;
        p.Y =  e.Y + button1.Top;
        button1.Left = p.X;
        button1.Top = p.Y ;

    }

}

private void button1_MouseUp(object sender, MouseEventArgs e)
{
    clicked = false;   
}

Answer 1

这就是你所需要的

    private Point MouseDownLocation;

    private void MyControl_MouseDown(object sender, MouseEventArgs e)
    {
        if (e.Button == System.Windows.Forms.MouseButtons.Left)
        {
            MouseDownLocation = e.Location;
        }
    }

    private void MyControl_MouseMove(object sender, MouseEventArgs e)
    {
        if (e.Button == System.Windows.Forms.MouseButtons.Left)
        {
            this.Left = e.X + this.Left - MouseDownLocation.X;
            this.Top = e.Y + this.Top - MouseDownLocation.Y;
        }
    }