/// <summary>
/// アイテムを登録解除する.
/// </summary>
/// <param name="index">アイテムのインデックス</param>
/// <returns></returns>
public async Task RemoveAtAsync(int index)
{
var item = this[index];
await LockscreenImageItemSettingHelper.Remove(item);
this.RemoveAt(index);
}
/// <summary>
/// ファイルを追加する.
/// </summary>
/// <param name="file">追加するファイル</param>
/// <param name="cancellationToken">キャンセル用のトークン</param>
/// <returns></returns>
public async Task <bool> AddFileAsync(StorageFile file, bool isTemporaryDefault, CancellationToken cancellationToken)
{
if (file == null)
{
throw new ArgumentNullException("file");
}
cancellationToken.ThrowIfCancellationRequested();
var item = await LockscreenImageItemSettingHelper.FromStorageItemAsync(file, isTemporaryDefault, cancellationToken);
if (item == null)
{
return(false);
}
if ((this.OnLaunchedDispatcher == null) || this.OnLaunchedDispatcher.HasThreadAccess)
{
await this.LockscreenItemList.AddItemAsync(item);
}
else
{
await this.OnLaunchedDispatcher.RunAsync(
Windows.UI.Core.CoreDispatcherPriority.Normal,
async() => { await this.LockscreenItemList.AddItemAsync(item); });
}
return(true);
}
/// <summary>
/// 登録されているアイテムを読み込む(実装).
/// </summary>
/// <returns></returns>
private async Task LoadAllItemsAsyncCore()
{
var itemsState = AppSettings.Instance.GetItemsState();
if (itemsState == null)
{
return;
}
foreach (var setting in LockscreenImageItemSettingHelper.DeserializeItems(itemsState))
{
if (!StorageApplicationPermissions.FutureAccessList.ContainsItem(setting.Token))
{
continue;
}
bool succeeded = false;
try
{
var file = await StorageApplicationPermissions.FutureAccessList.GetFileAsync(setting.Token);
var item = new LockscreenImageItem(file)
{
Setting = setting
};
Add(item);
succeeded = true;
}
catch (System.IO.FileNotFoundException)
{
succeeded = false;
}
if (!succeeded)
{
StorageApplicationPermissions.FutureAccessList.Remove(setting.Token);
if (!String.IsNullOrEmpty(setting.TileId))
{
await TileHelper.RemoveTileRegistrationAsync(setting.TileId);
}
continue;
}
}
}
/// <summary>
/// アイテムを登録解除する.
/// </summary>
/// <param name="item">アイテム</param>
/// <returns></returns>
public async Task RemoveAsync(LockscreenImageItem item)
{
await LockscreenImageItemSettingHelper.Remove(item);
this.Remove(item);
}
/// <summary>
/// 指定したインデックスのアイテムをロック画面に設定する.
/// </summary>
/// <param name="index">アイテムのインデックス</param>
/// <param name="itemState">アイテムの設定</param>
/// <returns>成功したら<c>true</c>。</returns>
private async Task <bool> SetItemToLockscreenAsync(int index, IDictionary <string, object> itemState)
{
var itemSetting = LockscreenImageItemSettingHelper.DeserializeItemAt(index, itemState);
if (itemSetting == null)
{
return(false);
}
if (!StorageApplicationPermissions.FutureAccessList.ContainsItem(itemSetting.Token))
{
return(false);
}
StorageFile file;
try
{
file = await StorageApplicationPermissions.FutureAccessList.GetFileAsync(itemSetting.Token).AsTask(this.cancellationTokenSource.Token);
if (file == null)
{
return(false);
}
}
catch (System.IO.IOException)
{
return(false);
}
try
{
// LockscreenItemsPage.SetSelectedItemToLockscreenAsync()と同じように対処する
bool succeedToSet = false;
try
{
await Windows.System.UserProfile.LockScreen.SetImageFileAsync(file).AsTask(this.cancellationTokenSource.Token);
succeedToSet = true;
}
catch (UnauthorizedAccessException)
{
// succeedToSetの上のコメント参照
}
if (!succeedToSet)
{
using (var strm = await file.OpenReadAsync())
{
await Windows.System.UserProfile.LockScreen.SetImageStreamAsync(strm);
succeedToSet = true;
}
}
return(succeedToSet);
}
catch (Exception ex)
{
// Dashboardにある品質情報によると
// BackgroundTask実行中にこれらの例外でクラッシュしている
if ((uint)ex.HResult == 0x80070490u)
{
return(false);
}
// FORTMATETC構造体が無効
if ((uint)ex.HResult == 0x80040064u)
{
return(false);
}
throw;
}
}
