public void ClearCallback()
{
if (StartDelayChanged != null)
{
foreach (Delegate d in StartDelayChanged.GetInvocationList())
{
StartDelayChanged -= (EventHandler)d;
}
}
if (DurationChanged != null)
{
foreach (Delegate d in DurationChanged.GetInvocationList())
{
DurationChanged -= (EventHandler)d;
}
}
if (PositionRequest != null)
{
foreach (Delegate d in PositionRequest.GetInvocationList())
{
PositionRequest -= (EventHandler)d;
}
}
if (StartCallback != null)
{
foreach (Delegate d in StartCallback.GetInvocationList())
{
StartCallback -= (EventHandler)d;
}
}
if (StopCallback != null)
{
foreach (Delegate d in StopCallback.GetInvocationList())
{
StopCallback -= (EventHandler)d;
}
}
if (NextCallback != null)
{
foreach (Delegate d in NextCallback.GetInvocationList())
{
NextCallback -= (EventHandler)d;
}
}
if (PrevCallback != null)
{
foreach (Delegate d in PrevCallback.GetInvocationList())
{
PrevCallback -= (EventHandler)d;
}
}
}
public void Prev()
{
PlayIndex--;
PrevCallback?.Invoke(this, new EventArgs());
}
