/// <summary>
/// Deletes the specified list.
/// </summary>
/// <param name="list">
/// The list to delete.
/// </param>
/// <returns>
/// A <see cref="Task"/> that represents the operation.
/// </returns>
public async Task DeleteAsync(TodoList list)
{
// Validate
if (list == null) throw new ArgumentNullException("list");
// Only proceed if lists are loaded
if (cache != null)
{
// If found, remove and save
if (cache.Contains(list))
{
cache.Remove(list);
await SaveAllAsync();
}
}
}
/// <summary>
/// Loads all lists.
/// </summary>
/// <param name="useCache">
/// <c>true</c> if the cache should be used when available; otherwise false.
/// </param>
/// <returns>
/// A <see cref="Task"/> that yields the result of the operation.
/// </returns>
public async Task<ObservableCollection<TodoList>> LoadListsAsync(bool useCache = true)
{
// If cache loaded and cache okay, just return it
if ((useCache) && (cache != null))
{
return cache;
}
// Either no cache or cache not allowed
// Try to load from disk
cache = await FileHelper.ReadFileAsync<ObservableCollection<TodoList>>(ListFileName, FileHelper.StorageStrategies.Roaming);
// If still null, that means the file doesn't exist. Create a new list.
if (cache == null)
{
var defaultList = new TodoList()
{
Title = "New List"
};
var defaultItem = new TodoItem()
{
Title = "New Item"
};
defaultList.Items.Add(defaultItem);
cache = new ObservableCollection<TodoList>()
{
defaultList
};
}
/*
cache = new ObservableCollection<TodoList>()
{
new TodoList()
{
Title = "Groceries",
Items = new ObservableCollection<TodoItem>()
{
new TodoItem() { Title = "Item A" },
new TodoItem() { Title = "Item B" },
new TodoItem() { Title = "Item C" },
new TodoItem() { Title = "Item D" },
}
},
new TodoList()
{
Title = "Home Supplies",
Items = new ObservableCollection<TodoItem>()
{
new TodoItem() { Title = "Item A" },
new TodoItem() { Title = "Item B" },
new TodoItem() { Title = "Item C" },
new TodoItem() { Title = "Item D" },
}
},
};
*/
return cache;
}
public Task SaveListAsync(TodoList list = null)
{
// If null, use current
if (list == null)
{
list = currentList;
}
// Save list with exception handling
if (list != null)
{
return RunWithErrorHandling(() => todoService.SaveAsync(list), TaskRunOptions.WithFailure(string.Format("Could not save {0} list", list.Title)));
}
else
{
return TaskHelper.CompletedTask;
}
}
/// <summary>
/// Savs the specified list.
/// </summary>
/// <param name="list">
/// The list to save.
/// </param>
/// <returns>
/// A <see cref="Task"/> that represents the operation.
/// </returns>
public async Task SaveAsync(TodoList list)
{
// Validate
if (list == null) throw new ArgumentNullException("list");
// Get the lists (loading if necessary)
var lists = await LoadListsAsync();
// If not in the lists, add
if (!lists.Contains(list))
{
lists.Add(list);
}
// Save all
await SaveAllAsync();
}
public void AddList()
{
var list = new TodoList()
{
Title = "New List"
};
var item = new TodoItem()
{
Title = "New Item"
};
list.Items.Add(item);
lists.Add(list);
CurrentList = list;
CurrentItem = item;
}