/// <summary>
/// Starts the hero image slide show.
/// </summary>
public void StartHeroImageSlideShow()
{
// Only start slideshow if we were able to get
// any hero images
if (HeroImages != null && HeroImages.Any())
{
_heroImageScrollTimer = new DispatcherTimer {
Interval = TimeSpan.FromSeconds(7)
};
StartHeroImageSlideshowTimer();
}
}
/// <summary>
/// Starts a timer which cycles through hero images.
/// </summary>
private void StartHeroImageSlideshowTimer()
{
_heroImageScrollTimer.Start();
_heroImageScrollTimer.Tick += (s, e) =>
{
var selectedIndex = HeroImages.IndexOf(SelectedHeroImage);
selectedIndex = (selectedIndex + 1) % HeroImages.Count;
SelectedHeroImage = HeroImages[selectedIndex];
};
}
/// <summary>
/// Instantiates the hero image slideshow timer.
/// </summary>
public void InstantiateHeroImageSlideShowTimer()
{
// Only instantiate slideshow timer if we were able to get
// any hero images
if (HeroImages != null && HeroImages.Any())
{
_heroImageScrollTimer = new DispatcherTimer {
Interval = TimeSpan.FromSeconds(HeroImageScrollTimerInterval)
};
_heroImageScrollTimer.Tick += (s, e) =>
{
var selectedIndex = HeroImages.IndexOf(SelectedHeroImage);
selectedIndex = (selectedIndex + 1) % HeroImages.Count;
SelectedHeroImage = HeroImages[selectedIndex];
};
}
}
/// <summary>
/// Loads the state.
/// </summary>
public override async Task LoadState()
{
await base.LoadState();
IsBusy = true;
IsStatusContainerVisible = true;
try
{
TopCategories.Clear();
// Load hero images
var heroImages = await _photoService.GetHeroImages(NumberOfHeroImages);
HeroImages.Clear();
heroImages.ForEach(h => HeroImages.Add(h));
// Load categories
var categories =
await _photoService.GetTopCategories(AppEnvironment.Instance.CategoryThumbnailsCount);
IsEmptyDataMessageVisible = !categories.Any();
IsStatusContainerVisible = !categories.Any();
foreach (var c in categories)
{
TopCategories.Add(c);
// For UI animation purposes, we wait a little until the next
// element is inserted.
await Task.Delay(200);
}
}
catch (ServiceException)
{
await _dialogService.ShowGenericServiceErrorNotification();
}
finally
{
IsBusy = false;
}
}
public async Task RefreshAsync(bool force = false)
{
// Check connectivity
if (!connectivityService.IsConnected())
{
await ShowNoConnectionDialog(dialogService);
return;
}
// Check if ViewModel is already loaded or refreshing
if (IsLoading || (IsLoaded && !force))
{
return;
}
IsLoading = true;
// Don't use placeholders when PullToRefresh is used
//if (!force)
//{
// // Get Mock Data to show placeholders
// HeroImages.ReplaceRange(MockData.GetHeroImages());
// //TopCategories.ReplaceRange(MockData.GetTopCategories());
// TopCategories = new ObservableRangeCollection<GroupedCategoryPreview>(MockData.GetTopCategories());
//}
// Get current user
try
{
// Try to restore user credentials
if (AzureAppService.Current.CurrentUser == null)
{
await photoService.RestoreSignInStatusAsync();
}
CurrentUser = await photoService.GetCurrentUser();
}
catch (Exception ex)
{
if (ex is UnauthorizedException || ex is ServiceException)
{
// User not logged in yet
CurrentUser = null;
}
else
{
throw;
}
}
// Load hero images
var heroes = await photoService.GetHeroImages(5);
HeroImages.ReplaceRange(heroes);
// Load categories
var topCat = await photoService.GetTopCategories(6);
var grouped =
from category in topCat
group category by category.Name into categoryGroup
select new GroupedCategoryPreview(categoryGroup.First()?.PhotoThumbnails, categoryGroup.Key, categoryGroup.Key.Substring(0, 1), categoryGroup.FirstOrDefault());
//HACK: Re-initializing because FlowListView crashes when Replacing lists at the moment.
TopCategories = new ObservableRangeCollection <GroupedCategoryPreview>(grouped);
//TopCategories.ReplaceRange(grouped);
// Check if loading went right
IsLoaded = HeroImages.Count > 0 || TopCategories.Count > 0;
IsLoading = false;
}