/// <summary>
/// 执行拖拽
/// </summary>
/// <returns>指示是否拦截消息</returns>
private static bool DoDrag(Control c, Point point, bool isClientArea)
{
try
{
Form form;
if (c == null || (form = c.FindForm()) == null)
{
return(false);
}
var e = new FormDraggingCancelEventArgs(c, point, isClientArea);
OnDragging(e);
if (e.Cancel)
{
return(false);
}
//当作为MDI子窗体且最大化时，拖MDI主窗体
if (form.WindowState == FormWindowState.Maximized)
{
form = form.MdiParent ?? form;
}
SendMessage(form.Handle, 0xA1, (IntPtr)2, IntPtr.Zero);
return(true);
}
catch
{
return(false);
}
}
private static void OnDragging(FormDraggingCancelEventArgs e)
{
var handler = Dragging;
if (handler != null)
{
handler(null, e);
}
}
private static void OnDragging(FormDraggingCancelEventArgs e) => Dragging?.Invoke(null, e);