//clear the current list of items and load the new items through GetItemsAsync
//this is executed when the user refreshes the list
async Task ExecuteLoadItemsCommand()
{
//the code will run only when IsBusy is false
if (IsBusy)
{
return;
}
//make is busy ture so that the user can't run this twice while it is runnig
IsBusy = true;
Debug.WriteLine("[ExecuteLoadItemsCommand]Start loading items...");
try
{
//clear all the items in the list
Items.Clear();
ItemGrouped.Clear();
Debug.WriteLine("[ExecuteLoadItemsCommand]Cleared items list");
//update the list only if it is connected to the internet
if (CrossConnectivity.Current.IsConnected)
{
//get new events online, and add them to the database if there is a new one
await SyncEvents.UpdateAcaEventsAsync();
}
else
{
Debug.WriteLine("No internet connection");
}
var itemsInDb = await App.Database.SortListByDate();
//add all the items to the list
foreach (var item in itemsInDb)
{
//add items to the list
Items.Add(item);
}
//refresh the grouped item list
SetupGroup(Items);
}
catch (Exception ex)
{
await SyncEvents.SendErrorEmail(ex.Message);
}
finally
{
//set the IsBusy to false after the program finishes
IsBusy = false;
ScrollToEvent = true;
Debug.WriteLine("[ExecuteLoadItemsCommand]There are " + Items.Count + " items in the database");
}
}
/// <summary>
/// Per item callback once grouping is achieved
/// </summary>
/// <param name="_particle"></param>
public void OneItemGroupingCompleted(ItemParticlesAnimation _particle)
{
if (_particle.itemAnimationData.compt > 0)
{
SetUnused(_particle);
ItemGrouped?.Invoke(_particle);
}
_particle.itemAnimationData.compt--;
if (_particle.itemAnimationData.compt <= 0)
{
_particle.itemAnimationData.compt = _particle.itemAnimationData.quantity;
OnGroupedCompleted?.Invoke(_particle);
}
}
//setup and group the given list into a grouped list
void SetupGroup(ObservableCollection <Item> items)
{
var allListItemGroups = new ObservableCollection <ItemGroup>();
foreach (var item in items)
{
//find any existing groups where the group thitle marches the first char of the Item list name
var listItemGroup = allListItemGroups.FirstOrDefault(g => g.Heading == item.GroupDate);
//if the group does not exist, create one
if (listItemGroup == null)
{
//create a new small list (group)
listItemGroup = new ItemGroup(item.GroupDate)
{
item
};
//add the list of items to the group
allListItemGroups.Add(listItemGroup);
}
else
{
//add the item to the small list
listItemGroup.Add(item);
}
}
Debug.WriteLine("[SetupGroup]Finished grouping items");
var finalGroupedList = allListItemGroups.Except(ItemGrouped);
foreach (var i in finalGroupedList)
{
ItemGrouped.Add(i);
}
Debug.WriteLine("[SetupGroup]Finished adding all the groups to the list");
}
