移动控件通过鼠标

Question

我要移动一个按钮鼠标，一切正常，但是当我在按钮的窗口，左边和顶部的按钮的鼠标移动（左上角）将光标定位POS机。

我不希望出现这种情况。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

我发现它...

这里是全码：

private void button1_MouseDown(object sender, MouseEventArgs e) 
{ 
    if (e.Button == System.Windows.Forms.MouseButtons.Left) 
    { 
     Point p = ConvertFromChildToForm(e.X, e.Y, button1); 
     iOldX = p.X; 
     iOldY = p.Y; 
     iClickX = e.X; 
     iClickY = e.Y; 
     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 - iClickX; 
     button1.Top = p.Y - iClickY; 

    } 

} 

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

Answer 2

我不知道我是否正确，但以防万一知道了...如果

private void button1_MouseMove(object sender, MouseEventArgs e) { 
     if (clicked) { 
     Point p = new Point(); //in form coordinates 
     p.X = e.X + button1.Left - (button1.Width/2); 
     p.Y = e.Y + button1.Top - (button1.Height/2); 
     button1.Left = p.X; 
     button1.Top = p.Y; 
     } 
    } 

Answer 3

此：问题是将光标定位在按钮（或另一组件）的中心，就可以通过考虑宽度和高度achive它是你需要的全部

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; 
     } 
    }