/// <summary>
/// Method should be called after construction to initialize the viewmodel
/// to view a default content.
/// </summary>
public void InitPath(string initialPath)
{
IDirectoryBrowser[] pathItems;
// Revert request to default if requested path is non-existing
if (Browser.DirectoryExists(initialPath, out pathItems) == false)
{
initialPath = Browser.SysDefault.FullName;
}
Logger.InfoFormat("'{0}'", initialPath);
var location = Browser.Create(initialPath);
var cancelTokenSrc = GetCancelToken();
var token = CancellationToken.None;
var InitTask = Task.Factory.StartNew(async(s) =>
{
await BreadcrumbBrowser.InitPathAsync();
NavigateToFolder(location);
}, token, TaskCreationOptions.LongRunning);
var request = new BrowseRequest <IDirectoryBrowser>(location,
RequestType.Navigational,
token, cancelTokenSrc, InitTask);
QueueTask(request);
}
/// <summary>
/// Master controler interface method to navigate all views
/// to the folder indicated in <paramref name="folder"/>
/// - updates all related viewmodels.
/// </summary>
/// <param name="request"></param>
/// <param name="requestor"</param>
private async Task <FinalBrowseResult <IDirectoryBrowser> > NavigateToFolderAsync(
BrowseRequest <IDirectoryBrowser> request
, object sender)
{
Logger.InfoFormat("'{0}'", request.NewLocation);
// Make sure the task always processes the last input but is not started twice
await _Semaphore.WaitAsync();
try
{
var newPath = request.NewLocation;
var cancel = request.CancelTok;
if (cancel != null)
{
cancel.ThrowIfCancellationRequested();
}
var browseResult = await BreadcrumbBrowser.NavigateToAsync(
request,
"AppViewModel.NavigateToFolderAsync"
);
return(browseResult);
}
catch (Exception exp)
{
var result = FinalBrowseResult <IDirectoryBrowser> .FromRequest(null, BrowseResult.InComplete);
result.UnexpectedError = exp;
return(result);
}
finally
{
_Semaphore.Release();
}
}
