/// <summary>
/// Invoked when the app is launched via an activation contract. In this case we care about ActivationKind.PrintTaskSettings
/// </summary>
/// <param name="args">Information about why this was invoked</param>
protected override void OnActivated(IActivatedEventArgs args)
{
if (args.Kind == ActivationKind.PrintTaskSettings)
{
Frame rootFrame = new Frame();
if (null == Window.Current.Content)
{
rootFrame.Navigate(typeof(MainPage));
Window.Current.Content = rootFrame;
}
Window.Current.Activate();
MainPage mainPage = (MainPage)rootFrame.Content;
// Get the PrinterExtensionContext from the activation arguments
IntPtr ptr = GetPrinterExtensionContextAsIntPtr(args);
// Create the Print Helper
PrintHelperClass printHelper = new PrintHelperClass(InitializationType.PrinterExtensionContextType, (ulong)ptr);
// Can use the Windows Runtime Component above to GetPrinterName() and do BiDi queries etc.
}
if (args.Kind == ActivationKind.PrintWorkflowForegroundTask)
{
Frame rootFrame = new Frame();
if (null == Window.Current.Content)
{
rootFrame.Navigate(typeof(WorkflowPage));
Window.Current.Content = rootFrame;
}
// Ensure the current window is active
ActivateWindowAndSetDesiredSize();
// Get the main page
WorkflowPage workflowPage = (WorkflowPage)rootFrame.Content;
// Workflow stuff here
// Make sure the page knows it's handling a foreground task activation
workflowPage.LaunchType = WorkflowPage.WorkflowPageLaunchType.ForegroundTask;
// Get the activation arguments
PrintWorkflowUIActivatedEventArgs printTaskUIEventArgs = args as PrintWorkflowUIActivatedEventArgs;
// Get the session manager
PrintWorkflowForegroundSession taskSessionManager = printTaskUIEventArgs.PrintWorkflowSession;
// Add the callback handlers - these are on the main page
taskSessionManager.SetupRequested += workflowPage.OnSetupRequested;
taskSessionManager.XpsDataAvailable += workflowPage.OnXpsDataAvailable;
taskSessionManager.Start();
}
}
/// <summary>
/// Handle the Print Task XPS Data Available Event
/// </summary>
/// <param name="sessionManager">Session manager</param>
/// <param name="printTaskXpsAvailableEventArgs">Has the Configuration and Controller</param>
internal async void OnXpsDataAvailable(PrintWorkflowForegroundSession sessionManager, PrintWorkflowXpsDataAvailableEventArgs printTaskXpsAvailableEventArgs)
{
// Take out a deferral whilst getting the information
Deferral xpsDataAvailableDeferral = printTaskXpsAvailableEventArgs.GetDeferral();
if (sessionManager != null && printTaskXpsAvailableEventArgs != null)
{
// See if we already have the information required and it
// were desireable to only have to enter this information once then
// you could determine that here and not do WaitUntilTheUIHasAllRequiredData();
}
// Don't actually exit until all UI stuff is done
await WaitUntilTheUIHasAllRequiredData();
// Complete the deferral taken out at the start of OnSetupRequested
xpsDataAvailableDeferral.Complete();
}
/// <summary>
/// Handle the Print Task Setup Event
/// </summary>
/// <param name="sessionManager">Session manager</param>
/// <param name="printTaskSetupArgs">Has the Configuration and Controller</param>
internal void OnSetupRequested(PrintWorkflowForegroundSession sessionManager, PrintWorkflowForegroundSetupRequestedEventArgs printTaskSetupArgs)
{
// If anything asynchronous is going to be done, you need to take out a deferral here,
// since otherwise the next callback happens once this one exits, which may be premature
Deferral setupRequestedDeferral = printTaskSetupArgs.GetDeferral();
// Get information about the source application, print job title, and session ID
string sourceApplicationName = printTaskSetupArgs.Configuration.SourceAppDisplayName;
string jobTitle = printTaskSetupArgs.Configuration.JobTitle;
string sessionId = printTaskSetupArgs.Configuration.SessionId;
string localStorageVariablePrefix = string.Format("{0}::", sessionId);
localStorage.SetStorageKeyPrefix(localStorageVariablePrefix);
// Get the PrinterExtensionContextNative from the activation arguments
IntPtr ptr = GetPrintWorkflowConfigurationNativeAsIntPtr(printTaskSetupArgs);
// Create the Print Helper
PrintHelperClass printHelper = new PrintHelperClass(InitializationType.PrinterExtensionContextNativeType, (ulong)ptr);
printerName = printHelper.GetPrinterName();
WorkflowHeadingLabel = string.Format(workflowHeadingFormat, sourceApplicationName, printerName);
// Add callback handler on main page
try
{
printHelper.OnInkLevelReceived += OnQueryResultReceived;
// Send the BiDi query
printHelper.SendInkLevelQuery();
}
catch (Exception ex)
{
string errorMessage = ex.Message;
Debug.WriteLine(errorMessage);
}
finally
{
// Complete the deferral taken out at the start of OnSetupRequested
setupRequestedDeferral.Complete();
}
}
