public ExpandableGroupsListViewModel()
{
MessagingCenter.Subscribe <GroupViewModel>(this, "UpdateSelectedItemsCountMessage", (e) => { UpdateSelectedItemsCount(); });
Task.Run(async() =>
{
IsBusy = true;
var livingItemsDataServicce = new LifeDataService();
var livingItems = (await livingItemsDataServicce.GetItemsAsync()).ToList();
var groups = livingItems.GroupBy(x => x.Category).Select(x => new ObservableGroupCollection <string, LifeOnPlanetModel>(x)).ToList();
IsBusy = false;
//This is required to invoke on main thread otherwise it will throw the exception
Device.BeginInvokeOnMainThread(() =>
{
foreach (var group in groups)
{
GroupedItems.Add(
new GroupViewModel
(
groupTitle: group.Key,
groupChildItems: group.Select(i => new GroupItemModel(i.Id, i.Name, i.IsSelected)).ToList()
));
}
//Show selected items count initialy when page loads
UpdateSelectedItemsCount();
});
});
}
private void CreateGroupedItems(TLMessageBase currentItem)
{
var message73 = currentItem as TLMessage73;
if (message73 != null && message73.GroupedId != null)
{
var firstItem = GroupedItems.FirstOrDefault() as TLMessage73;
if (firstItem == null ||
(firstItem.GroupedId != null &&
firstItem.GroupedId.Value != message73.GroupedId.Value))
{
var items = new List <TLMessageBase>();
for (var i = _items.Count - 1; i >= 0; i--)
{
var item = _items[i] as TLMessage73;
if (item != null &&
item.GroupedId != null &&
item.GroupedId.Value == message73.GroupedId.Value)
{
items.Add(item);
}
}
GroupedItems.IsNotifying = false;
GroupedItems.Clear();
if (items.Count > 1)
{
foreach (var item in items)
{
GroupedItems.Add(item);
}
}
GroupedItems.IsNotifying = true;
GroupedItems.Refresh();
var view = GetView() as ImageViewerView;
if (view != null)
{
view.ScrollTo(currentItem, 0.0);
}
}
else if (firstItem.GroupedId != null &&
firstItem.GroupedId.Value == message73.GroupedId.Value)
{
var view = GetView() as ImageViewerView;
if (view != null)
{
view.ScrollTo(currentItem, 0.0);
}
}
else
{
GroupedItems.Clear();
}
}
else
{
GroupedItems.Clear();
}
}
/// <summary>
/// Load album data from database.
/// </summary>
/// <param name="cancellationToken">Cancellation token.</param>
/// <returns>Processed albums.</returns>
private async Task LoadAlbumData(CancellationToken cancellationToken)
{
if (GlobalLibraryCache.CachedDbAlbum == null)
{
await GlobalLibraryCache.LoadAlbumAsync();
if (cancellationToken.IsCancellationRequested)
{
return;
}
}
foreach (var item in GlobalLibraryCache.CachedDbAlbum)
{
var e = CommonViewItemModel.CreateFromDbAlbumAndCheck(item);
GroupedItems.Add(e);
}
}
public async Task PopulateGroupedItemsFromDB()
{
// Generates the grouped list of active categories as needed by the Xamarin.Forms ListView,
// limited by the user's conversation limit setting because there could be more items in the
// database above the limit that we haven't cleaned up yet.
GroupedItems.Clear();
var categories = Configuration.GetCategories(CategorySet.Active);
IEnumerable <Item> list;
foreach (String c in categories)
{
list = await db.GetItemListForCategoryAsync(c, Configuration.CurrentUser.ConversationLimit);
Group group = new Group(0, c, list);
GroupedItems.Add(group);
}
}
/// <summary>
/// Load file data from database.
/// </summary>
/// <param name="cancellationToken">Cancellation token.</param>
/// <returns>Processed files.</returns>
public async Task <IEnumerable <CommonViewItemModel> > LoadSongData(CancellationToken cancellationToken)
{
if (GlobalLibraryCache.CachedDbMediaFile == null)
{
await GlobalLibraryCache.LoadMediaAsync();
}
var result = new List <CommonViewItemModel>(GlobalLibraryCache.CachedDbMediaFile.Length);
foreach (var item in GlobalLibraryCache.CachedDbMediaFile)
{
var e = new CommonViewItemModel(item);
GroupedItems.Add(e);
result.Add(e);
}
return(result);
}
private void MenuItem_OnClicked(object sender, EventArgs e)
{
UserDialogs.Instance.Prompt(new PromptConfig
{
Title = "Kategorie erstellen",
InputType = InputType.Default,
OkText = "Erstellen",
CancelText = "Abbrechen",
OnAction = result =>
{
if (!result.Ok)
{
return;
}
GroupedItems.Add(new MemoryGroup(result.Text));
}
});
}
