/// <summary>
/// Creates a new instance of <see cref="DataLoaderViewState"/> copying all propreties from the provided <paramref name="dataLoaderViewState"/>.
/// </summary>
/// <remarks>
/// This copy constructor can be useful if you want to use x:Bind inside a DataLoader's ContentTemplate.
/// </remarks>
/// <param name="dataLoaderViewState">The copy reference.</param>
public DataLoaderViewState(DataLoaderViewState dataLoaderViewState)
{
View = dataLoaderViewState.View;
Parent = dataLoaderViewState.Parent;
Source = dataLoaderViewState.Source;
Request = dataLoaderViewState.Request;
Data = dataLoaderViewState.Data;
Error = dataLoaderViewState.Error;
IsLoading = dataLoaderViewState.IsLoading;
IsInitial = dataLoaderViewState.IsInitial;
IsEmpty = dataLoaderViewState.IsEmpty;
}
private void UpdateUI(IDataLoaderState newState)
{
var safeState = newState ?? DataLoaderState.Default;
var view = Delegate.GetView();
var viewState = CreateDataLoaderViewState(safeState, view);
Delegate.SetState(viewState);
if (view != null)
{
var dataVisualState = GetDataVisualState(safeState);
GoToState(view, DataVisualGroup, dataVisualState);
var errorVisualState = GetErrorVisualState(safeState);
GoToState(view, ErrorVisualGroup, errorVisualState);
var loadingVisualState = GetLoadingStateVisualState(safeState);
GoToState(view, LoadingVisualGroup, loadingVisualState);
var combinedVisualState = $"{dataVisualState}_{errorVisualState}_{loadingVisualState}";
GoToState(view, CombinedVisualGroup, combinedVisualState);
if (_isLoaded)
{
_isVisualStateRefreshRequired = false;
if (_logger.IsEnabled(LogLevel.Information))
{
_logger.LogInformation($"Updated VisualStates to '{combinedVisualState}'.");
}
}
else
{
// If the control isn't loaded, the visual states are not applied.
_isVisualStateRefreshRequired = true;
if (_logger.IsEnabled(LogLevel.Debug))
{
_logger.LogTrace($"Saved VisualStates to '{combinedVisualState}'. (This control isn't loaded yet.)");
}
}
}
_lastUpdate = DateTime.Now;
_lastState = safeState;
_lastViewState = viewState;
}
void IDataLoaderViewDelegate.SetState(DataLoaderViewState viewState)
{
SetState(viewState);
}
/// <summary>
/// Sets the <see cref="State"/>.
/// </summary>
/// <remarks>
/// This method is virtual to allow creation of more strongly typed version of DataLoaderView to allow usage of x:Bind inside the ContentTemplate.
/// </remarks>
/// <param name="state">The <see cref="DataLoaderViewState"/> to set as the current state.</param>
protected virtual void SetState(DataLoaderViewState state)
{
State = state;
}