public async Task ShowAsync(bool immediate = false)
{
//If we're currently appeared or appearing we're already doing the thing we wanna be doing so just return
if (state == PanelViewControllerState.Appeared || state == PanelViewControllerState.Appearing)
{
return;
}
//If we're in the middle of disappearing we need to cancel the disappearing action
if (state == PanelViewControllerState.Disappearing)
{
//Cancel Current Transition
cancellationTokenSource.Cancel();
cancellationTokenSource = null;
}
state = PanelViewControllerState.Appearing;
if (cancellationTokenSource == null)
{
cancellationTokenSource = new CancellationTokenSource();
}
var currentToken = cancellationTokenSource.Token;
if (!IsViewLoaded)
{
await LoadViewAsync().ConfigureAwait(true);
if (currentToken.IsCancellationRequested)
{
return;
}
}
willAppear?.Invoke();
if (immediate)
{
panelView.ShowImmediate();
}
else
{
await panelView.ShowAsync(currentToken);
}
if (cancellationTokenSource.IsCancellationRequested)
{
return;
}
state = PanelViewControllerState.Appeared;
didAppear?.Invoke();
}
public async Task HideAsync(bool immediate = false)
{
//If we're already disappeared or disappearing we're already doing the right thing so just return
if (state == PanelViewControllerState.Disappeared || state == PanelViewControllerState.Disappearing)
{
return;
}
//If we're currently appearing we should cancel the appear using our cancellation token
if (state == PanelViewControllerState.Appearing && cancellationTokenSource != null)
{
//Cancel Current Transition
cancellationTokenSource.Cancel();
cancellationTokenSource = null;
}
state = PanelViewControllerState.Disappearing;
if (cancellationTokenSource == null)
{
cancellationTokenSource = new CancellationTokenSource();
}
var currentToken = cancellationTokenSource.Token;
willDisappear?.Invoke();
if (immediate)
{
panelView.HideImmediate();
}
else
{
await panelView.HideAsync(currentToken);
}
if (currentToken.IsCancellationRequested)
{
return;
}
didDisappear?.Invoke();
state = PanelViewControllerState.Disappeared;
}
