/// <summary>
/// Outputs an asynchronous operation.
/// When the operation completes, a initialized PdfModelSF object, representing the PDF, is returned.
/// </summary>
/// <param name="pdfStorageFile">The PDF file</param>
/// <returns>An initialized PdfModelSF object.</returns>
public static async Task <PdfModelSF> LoadFromFile(StorageFile pdfStorageFile, string password = null)
{
PdfModelSF pdfModel = new PdfModelSF(pdfStorageFile);
pdfModel.PdfDoc = new PdfLoadedDocument();
// Load PDF from file
try
{
if (password == null)
{
await pdfModel.PdfDoc.OpenAsync(pdfStorageFile);
}
else
{
await pdfModel.PdfDoc.OpenAsync(pdfStorageFile, password);
}
}
catch (Exception ex)
{
// Failed to load the file
AppEventSource.Log.Debug("PDFModelSF: " + ex.Message);
// Notify the user?
App.NotifyUser(typeof(ViewerPage), "Failed to open the file.\n" + ex.Message, true);
pdfModel = null;
}
return(pdfModel);
}
/// <summary>
/// Initializes the components of a new PDFModel instance.
/// </summary>
/// <param name="dataFolder">The folder storing the in-app user data.</param>
/// <returns></returns>
private async Task InitializeComponents(StorageFolder dataFolder)
{
// Create backup folder
backupFolder = await dataFolder.CreateFolderAsync(BACKUP_FOLDER, CreationCollisionOption.OpenIfExists);
// Delete existing backup copies
foreach (StorageFile file in await backupFolder.GetFilesAsync())
{
try
{
await file.DeleteAsync();
}
catch
{
}
}
// Create a backup copy
backupFile = await pdfFile.CopyAsync(backupFolder, pdfFile.Name, NameCollisionOption.GenerateUniqueName);
sfFile = await pdfFile.CopyAsync(backupFolder, "SF_" + pdfFile.Name, NameCollisionOption.GenerateUniqueName);
// Load the file to Microsoft PDF document model
// The Microsoft model is used to render the PDF pages.
msPdf = await PdfModelMS.LoadFromFile(backupFile);
// Return null if failed to load the file to Microsoft model
if (msPdf == null)
{
return;
}
// Load the file to Syncfusion PDF document model
// The Syncfusion model is used to save ink annotations.
if (msPdf.IsPasswordProtected)
{
sfPdf = await PdfModelSF.LoadFromFile(sfFile, msPdf.Password);
}
else
{
sfPdf = await PdfModelSF.LoadFromFile(sfFile);
}
// Return null if failed to load the file to Syncfusion model
if (sfPdf == null)
{
return;
}
ScaleRatio = sfPdf.GetPage(1).Size.Width / msPdf.GetPage(1).Dimensions.MediaBox.Width;
}
