public void Add(string key, IPreLoadable preLoadable)
{
this._queue.Add(preLoadable, key);
preLoadable.OnPreLoaded += new EventHandler<PreLoadingItemCompleteEventArgs>(this.PreLoadingItemCompleted);
preLoadable.OnPreLoadingProgress += new EventHandler<PreLoadingProgressEventArgs>(this.PreLoadableOnPreLoadingProgress);
preLoadable.OnPreLoadFailed += new EventHandler(this.PreLoadableFailed);
}
/// <summary>
/// Sets the view as a loading one and execute asynchronously the PreLoad method of IPreLoadable.
/// Once loaded, it replaces the loading view by the freshly loaded ViewModel
/// </summary>
/// <param name="vm"></param>
private async void AsyncLoadViewModel(IPreLoadable vm) {
vm.IsPreLoadNeeded = false; // This ViewModel doesn't need loading anymore
nowLoadingViewModel = currentViewModel; // Set the currently loading ViewModel
currentViewModel = loadingViewModel; // Display the loading view
vm.IsCurrentlyLoading = true;
await Task.Factory.StartNew(vm.PreLoad); // Launch the preloading in another task
vm.IsCurrentlyLoading = false;
// Check if the view is a ILoadingViewModel and if it's currently in a loading state
if(nowLoadingViewModel != null && !(nowLoadingViewModel as IPreLoadable).IsCurrentlyLoading) {
currentViewModel = nowLoadingViewModel; // Replace the loading by the freshly loaded ViewModel
nowLoadingViewModel = null;
RaiseViewModelDisplayed(currentViewModel);
RaisePropertyChanged("CurrentViewModel");
}
}
