private void EmailList_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (EmailList.SelectedIndex == -1)
{
MarkRead.IsEnabled = false;
}
else
{
MarkRead.IsEnabled = true;
if ((EmailList.SelectedItem as EmailItem).IsNotSeenIndicator == 0)
{
if (DisplayMode.SelectedIndex != 1)
{
MarkRead.Label = "标记为未读";
}
}
else
{
MarkRead.Label = "标记为已读";
}
}
if (Nav.CurrentSourcePageType.Name == "EmailSender")
{
Nav.GoBack();
}
}
private void NewPouch()
{
JsonSerializer ser = new JsonSerializer();
ser.SerializePouch(this.Pouch);
this.Pouch = ser.DeserializePouch();
Nav.GoBack();
}
private async void FileTree_ItemInvoked(TreeView sender, TreeViewItemInvokedEventArgs args)
{
/*
* 同一文件夹内可能存在大量文件
* 因此切换不同文件夹时极有可能遍历文件夹仍未完成
* 此处激活取消指令，等待当前遍历结束，再开始下一次文件遍历
* 确保不会出现异常
*/
//防止多次点击同一文件夹导致的多重查找
if ((args.InvokedItem as TreeViewNode).Content is StorageFolder folder)
{
if (folder.FolderRelativeId == CurrentFolder?.FolderRelativeId)
{
IsAdding = false;
return;
}
if (IsAdding)
{
await Task.Run(() =>
{
lock (SyncRootProvider.SyncRoot)
{
CancelToken.Cancel();
Locker.WaitOne();
}
});
}
IsAdding = true;
CurrentFolder = folder;
CurrentNode = args.InvokedItem as TreeViewNode;
USBFilePresenter.ThisPage.DisplayNode = CurrentNode;
//当处于USB其他附加功能的页面时，若点击文件目录则自动执行返回导航
if (Nav.CurrentSourcePageType.Name != "USBFilePresenter")
{
Nav.GoBack();
}
USBFilePresenter.ThisPage.FileCollection.Clear();
QueryOptions Options = new QueryOptions(CommonFileQuery.DefaultQuery, null)
{
FolderDepth = FolderDepth.Shallow,
IndexerOption = IndexerOption.UseIndexerWhenAvailable
};
Options.SetThumbnailPrefetch(ThumbnailMode.ListView, 60, ThumbnailOptions.ResizeThumbnail);
var FileQuery = folder.CreateFileQueryWithOptions(Options);
var FileList = await FileQuery.GetFilesAsync();
USBFilePresenter.ThisPage.HasFile.Visibility = FileList.Count == 0 ? Visibility.Visible : Visibility.Collapsed;
if (FileTracker != null)
{
FileTracker.Created -= FileTracker_Created;
FileTracker.Deleted -= FileTracker_Deleted;
FileTracker.Renamed -= FileTracker_Renamed;
FileTracker.Dispose();
FileTracker = null;
}
FileTracker = new FileSystemTracker(FileQuery);
FileTracker.Created += FileTracker_Created;
FileTracker.Deleted += FileTracker_Deleted;
FileTracker.Renamed += FileTracker_Renamed;
foreach (var file in FileList)
{
if (CancelToken.IsCancellationRequested)
{
goto FLAG;
}
USBFilePresenter.ThisPage.FileCollection.Add(new RemovableDeviceFile(file));
}
}
FLAG:
if (CancelToken.IsCancellationRequested)
{
CancelToken.Dispose();
CancelToken = new CancellationTokenSource();
Locker.Set();
}
else
{
IsAdding = false;
}
}