/// <summary>
/// 异步获取实例
/// </summary>
/// <returns></returns>
public static async Task <MemoryListViewModel> GetInstanceAsync()
{
if (_uniqueInstance != null)
{
return(_uniqueInstance);
}
lock (Locker)
{
// 如果类的实例不存在则创建，否则直接返回
if (_uniqueInstance == null)
{
// ReSharper disable once PossibleMultipleWriteAccessInDoubleCheckLocking
_uniqueInstance = new MemoryListViewModel();
}
}
_uniqueInstance._memoryList = await MemoryList.GetInstanceAsync();
foreach (var memoryModel in _uniqueInstance._memoryList.MemoryModels)
{
var memoryViewModel = await MemoryViewModel.GetInstanceAsync(memoryModel);
_uniqueInstance.MemoryViewModels.Add(memoryViewModel);
}
return(_uniqueInstance);
}
/// <summary>
/// 异步获取实例
/// </summary>
/// <returns></returns>
public static async Task <MemoryViewModel> GetInstanceAsync(MemoryModel memoryModel = null)
{
var memoryViewModel = new MemoryViewModel(memoryModel)
{
_imageViewModels = new List <ImageViewModel>()
};
if (memoryModel?.ImageModels == null)
{
return(memoryViewModel);
}
foreach (var imageModel in memoryModel.ImageModels)
{
var imageViewModel = await ImageViewModel.GetInstanceAsync(imageModel);
memoryViewModel._imageViewModels.Add(imageViewModel);
}
if (memoryViewModel._imageViewModels != null && memoryViewModel._imageViewModels.Count > 0)
{
memoryViewModel.CoverImage = memoryViewModel._imageViewModels[0].ThumbnailImage;
}
else
{
memoryViewModel.CoverImage = new BitmapImage(new Uri("ms-appx:///Assets/Gray.png"));
}
return(memoryViewModel);
}
/// <summary>
/// 删除一个回忆
/// </summary>
public void Delete(MemoryViewModel memoryViewModel)
{
if (!MemoryViewModels.Contains(memoryViewModel))
{
return;
}
_memoryList.Delete(memoryViewModel);
MemoryViewModels.Remove(memoryViewModel);
}
/// <summary>
/// 增加一条回忆
/// </summary>
public void Add(MemoryViewModel memoryViewModel)
{
if (MemoryViewModels.Contains(memoryViewModel))
{
return;
}
_memoryList.Add(memoryViewModel);
MemoryViewModels.Add(memoryViewModel);
}