代码库のC#可移动按钮“相关代码”

代码库のC#可移动按钮“相关代码”

#region 可移动按钮“相关代码”
 
Point mouse_offset;
private void Button_MouseDown(object sender , MouseEventArgs e)
{
    mouse_offset = e.Location; //将当前鼠标相对于“窗体”左上角的坐标赋值给mouse_offset
}
 
private void Button_MouseMove(object sender , MouseEventArgs e)
{
 
    if ( e.Button == MouseButtons.Left )
    {
        //将相对屏幕坐标转换为相对工作区的坐标。
        int left = PointToClient(Control.MousePosition).X - mouse_offset.X;
        int top = PointToClient(Control.MousePosition).Y - mouse_offset.Y;
         
        //左右可能越界
        if(left<0)
            left=0;
        if ( left > this.Width )
            left = this.Width - ( (Button)sender ).Width;
 
        //上下可能越界
        if ( top < 0 )
            top = 0;
        if ( top > this.Height )
            top = this.Height - ( (Button)sender ).Height;
 
         
        ( (Button)sender ).Left = left;
        ( (Button)sender ).Top = top;
    }
}
 
#endregion