public static async Task <CursorWait> NewAsync(Control objControl = null, bool blnAppStarting = false, CancellationToken token = default)
{
CursorWait objReturn = new CursorWait(objControl, blnAppStarting);
if (objReturn._objControl == null)
{
if (Interlocked.Increment(ref _intApplicationWaitCursors) == 1)
{
Application.UseWaitCursor = true;
objReturn._blnDoUnsetCursorOnDispose = true;
}
return(objReturn);
}
Form frmControl = objReturn._objControl as Form;
try
{
if (frmControl == null || await frmControl.DoThreadSafeFuncAsync(x => x.IsMdiChild, token))
{
if (frmControl != null)
{
objReturn._frmControlTopParent = await frmControl.DoThreadSafeFuncAsync(x => x.MdiParent, token);
}
else if (objReturn._objControl is UserControl objUserControl)
{
objReturn._frmControlTopParent = await objUserControl.DoThreadSafeFuncAsync(x => x.ParentForm, token);
}
else if (objReturn._objControl != null)
{
for (Control objLoop = await objReturn._objControl.DoThreadSafeFuncAsync(x => x.Parent, token); objLoop != null; objLoop = await objLoop.DoThreadSafeFuncAsync(x => x.Parent, token))
{
if (objLoop is Form objLoopForm)
{
objReturn._frmControlTopParent = objLoopForm;
break;
}
}
}
}
}
catch (OperationCanceledException)
{
await objReturn.DisposeAsync();
throw;
}
if (objReturn._objControl != null)
{
if (objReturn._blnAppStartingCursor)
{
int intNewValue = s_DicCursorControls.AddOrUpdate(objReturn._objControl, 1, (x, y) => Interlocked.Increment(ref y));
try
{
await objReturn.SetControlCursorAsync(intNewValue < short.MaxValue?Cursors.AppStarting : Cursors.WaitCursor, token);
}
catch (OperationCanceledException)
{
await objReturn.DisposeAsync();
throw;
}
objReturn._blnDoUnsetCursorOnDispose = true;
}
else
{
s_DicCursorControls.AddOrUpdate(objReturn._objControl, short.MaxValue, (x, y) => Interlocked.Add(ref y, short.MaxValue));
try
{
await objReturn.SetControlCursorAsync(Cursors.WaitCursor, token);
}
catch (OperationCanceledException)
{
await objReturn.DisposeAsync();
throw;
}
objReturn._blnDoUnsetCursorOnDispose = true;
}
}
return(objReturn);
}