public ProgressMonitor BeginAsyncStep(string message, int work)
{
if (currentTask == null)
{
throw new InvalidOperationException("Task not started in progress monitor");
}
if (work < 0)
{
throw new ArgumentException("work can't be negative");
}
ConsumePendingWork();
if (message != null)
{
currentTask.Step(message, 0);
}
ProgressMonitor m = null;
if (context != null)
{
context.Send((o) => m = CreateAsyncStepMonitor(), null);
}
else
{
m = CreateAsyncStepMonitor();
}
m.SetParentTask(this, currentTask, work);
if (context != null)
{
context.Post((o) => {
OnBeginAsyncStep(message, work, m);
ReportProgressChanged();
}, null);
}
else
{
OnBeginAsyncStep(message, work, m);
ReportProgressChanged();
}
if (slaveMonitors != null)
{
foreach (var sm in slaveMonitors)
{
m.AddSlaveMonitor(sm.BeginAsyncStep(message, work));
}
}
return(m);
}