/// <summary>
/// When we leave the page, unregister the FlipPdfViewer from the print system.
/// </summary>
/// <param name="e">NavigationEventArgs, ignored here.</param>
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
if (PrintingIsSupported)
{
FlipPdfViewer.UnRegisterForPrinting();
}
SizeChanged -= LoadPdf_SizeChanged;
}
/// <summary>
/// Triggered by the MainPage's PdfFrame.Navigate calls in the various Button
/// event handlers for loading Pdf documents from embedded PDF files, the file system,
/// or an Internet URI.
/// </summary>
/// <param name="e">NavigationEventArgs, a NavigationContext object.</param>
protected override void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
// cast the passed parameter as a NavigationContext object
var parameters = e.Parameter as NavigationContext;
SizeChanged += LoadPdf_SizeChanged;
// if we actually have a NavigationContext object passed...
if (null != parameters)
{
// set the FlipPdfViewer's background color before rendering
FlipPdfViewer.PdfBackgroundColor = parameters.BackgroundColor;
bool isFile = parameters.IsFile;
// if the passed NavigationContext is a StorageFile
if (isFile)
{
StorageFile pdfFile = parameters.PdfFile;
// Open the Pdf file through the FlipPdfViewer's StorageFileSource
// property directly. This will trigger loading the PDF file.
FlipPdfViewer.StorageFileSource = pdfFile;
ForwardStatusMessage("Opening PDF File from Storage");
}
else
{
// It's not a file but a Uri, so set our Uri property,
// bound to the FlipPdfViewer in XAML, which will trigger
// loading the PDF file.
PdfSource = parameters.PdfUri;
}
PrintingIsSupported = FlipPdfViewer.PrintingIsSupported;
// set forward message delegate instances
FlipPdfViewer.HostStatusMsgHandler = ForwardStatusMessage;
FlipPdfViewer.HostErrorMsgHandler = ForwardErrorMessage;
// if the FlipPdfViewer supports printing, register it with the print system. We do this here
// so it can be unregisterd in OnNavigatedFrom.
if (PrintingIsSupported)
{
// register FlipPdfViewer for printing
FlipPdfViewer.RegisterForPrinting();
}
}
}
/// <summary>
/// Print the current Pdf document.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void OnPrintButtonClick(object sender, RoutedEventArgs e)
{
await FlipPdfViewer.OnPrintButtonClick();
}
/// <summary>
/// Restore the current page of the FlipPdfViewer to its original size and aspect ratio.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void DoFitDocumentImageToScreen(object sender, RoutedEventArgs e)
{
FlipPdfViewer.ZoomReset();
}
/// <summary>
/// Zoom out of the current page of the FlipPdfViewer.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ZoomOut(object sender, RoutedEventArgs e)
{
FlipPdfViewer.ZoomOut();
}
/// <summary>
/// Increment the Pdf page shown in the FlipPdfViewer.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void MoveFlipViewForward(object sender, RoutedEventArgs e)
{
FlipPdfViewer.IncrementPage();
}
/// <summary>
/// Decrement the Pdf page shown in the FlipPdfViewer.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void MoveFlipViewBack(object sender, RoutedEventArgs e)
{
FlipPdfViewer.DecrementPage();
}
/// <summary>
/// We have to resize the Pdf page currently displayed when we resize.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void LoadPdf_SizeChanged(object sender, SizeChangedEventArgs e)
{
FlipPdfViewer.ZoomReset();
}
