/// <summary>
/// Creates and adds one print preview page to the internal cache of print preview pages stored in <see cref="_printPreviewPages"/>.
/// </summary>
/// <param name="element">FrameworkElement used to represent the "printing page"</param>
/// <param name="printPageDescription">Printer's page description</param>
/// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
private RichTextBlockOverflow AddOnePrintPreviewPage(FrameworkElement element, PrintPageDescription printPageDescription)
{
var page = new Page();
Grid printableArea;
// Check if this is the first page ( no previous RichTextBlockOverflow)
if (element == null)
{
// If this is the first page add the specific scenario content
page = _firstPage;
printableArea = page.FindName("printableArea") as Grid;
FrameworkElement fre = page.Content as FrameworkElement;
string name = fre.Name;
printableArea = fre.FindName("printableArea") as Grid;
//if (_elementsToPrint[0].GetType() == typeof(Grid))
//{
printableArea = _elementsToPrint[0] as Grid;
//}
//Save state
if (!_stateBags.ContainsKey(printableArea))
{
var stateBag = new PrintHelperStateBag();
stateBag.Capture(printableArea);
_stateBags.Add(printableArea, stateBag);
}
}
else
{
// Save state
if (!_stateBags.ContainsKey(element))
{
var stateBag = new PrintHelperStateBag();
stateBag.Capture(element);
_stateBags.Add(element, stateBag);
}
// Flow content (text) from previous pages
page = new ContinuationPage(element as RichTextBlockOverflow);
printableArea = page.FindName("printableArea") as Grid;
}
// Set "paper" width
page.Width = printPageDescription.PageSize.Width;
page.Height = printPageDescription.PageSize.Height;
// Get the margins size
double marginWidth = Math.Max(printPageDescription.PageSize.Width - printPageDescription.ImageableRect.Width, printPageDescription.PageSize.Width * ApplicationContentMarginLeft * 2);
double marginHeight = Math.Max(printPageDescription.PageSize.Height - printPageDescription.ImageableRect.Height, printPageDescription.PageSize.Height * ApplicationContentMarginTop * 2);
//printableArea = page.FindName("printableArea") as Grid;
if (printableArea != null)
{
// Set up the "printable area" on the "paper"
printableArea.Width = _firstPage.Width - marginWidth;
printableArea.Height = _firstPage.Height - marginHeight;
}
//element.VerticalAlignment = VerticalAlignment.Top;
//element.HorizontalAlignment = HorizontalAlignment.Left;
//if (element.Width > element.Height)
//{
// var newWidth = page.Width - marginWidth;
// element.Height = element.Height * (newWidth / element.Width);
// element.Width = newWidth;
//}
//else
//{
// var newHeight = page.Height - marginHeight;
// element.Width = element.Width * (newHeight / element.Height);
// element.Height = newHeight;
//}
//element.Margin = new Thickness(marginWidth / 2, marginHeight / 2, marginWidth / 2, marginHeight / 2);
//page.Content = element;
// Add the (newley created) page to the print canvas which is part of the visual tree and force it to go
// through layout so that the linked containers correctly distribute the content inside them.
_printCanvas.Children.Add(page);
_printCanvas.InvalidateMeasure();
_printCanvas.UpdateLayout();
// Find the last text container and see if the content is overflowing
RichTextBlockOverflow textLink = (RichTextBlockOverflow)page.FindName("ContinuationPageLinkedContainer");
// Check if this is the last page
if (!textLink.HasOverflowContent && textLink.Visibility == Visibility.Visible)
{
_printCanvas.UpdateLayout();
}
// Add the page to the page preview collection
_printPreviewPages.Add(page);
return(textLink);
//return DispatcherHelper.ExecuteOnUIThreadAsync(
// () =>
// {
// // Add the (newly created) page to the print canvas which is part of the visual tree and force it to go
// // through layout so that the linked containers correctly distribute the content inside them.
// _printCanvas.Children.Add(page);
// _printCanvas.UpdateLayout();
// _printCanvas.InvalidateMeasure();
// // Add the page to the page preview collection
// _printPreviewPages.Add(page);
// }, Windows.UI.Core.CoreDispatcherPriority.High);
}
/// <summary>
/// This function creates and adds one print preview page to the internal cache of print preview
/// pages stored in printPreviewPages.
/// </summary>
/// <param name="lastRTBOAdded">Last RichTextBlockOverflow element added in the current content</param>
/// <param name="printPageDescription">Printer's page description</param>
protected virtual RichTextBlockOverflow AddOnePrintPreviewPage(RichTextBlockOverflow lastRTBOAdded, PrintPageDescription printPageDescription)
{
// XAML element that is used to represent to "printing page"
FrameworkElement page;
// The link container for text overflowing in this page
RichTextBlockOverflow textLink;
// Check if this is the first page ( no previous RichTextBlockOverflow)
if (lastRTBOAdded == null)
{
// If this is the first page add the specific scenario content
page = firstPage;
// Hide footer since we don't know yet if it will be displayed (this might not be the last page) - wait for layout
//StackPanel footer = (StackPanel)page.FindName("Footer");
//footer.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
}
else
{
// Flow content (text) from previous pages
page = new ContinuationPage(lastRTBOAdded);
}
// Set "paper" width
page.Width = printPageDescription.PageSize.Width;
page.Height = printPageDescription.PageSize.Height;
Grid printableArea = (Grid)page.FindName("printPage1");
// Get the margins size
// If the ImageableRect is smaller than the app provided margins use the ImageableRect
double marginWidth = Math.Max(printPageDescription.PageSize.Width - printPageDescription.ImageableRect.Width, printPageDescription.PageSize.Width * ApplicationContentMarginLeft * 2);
double marginHeight = Math.Max(printPageDescription.PageSize.Height - printPageDescription.ImageableRect.Height, printPageDescription.PageSize.Height * ApplicationContentMarginTop * 2);
// Set-up "printable area" on the "paper"
printableArea.Width = firstPage.Width - marginWidth;
printableArea.Height = firstPage.Height - marginHeight;
// Add the (newley created) page to the print canvas which is part of the visual tree and force it to go
// through layout so that the linked containers correctly distribute the content inside them.
PrintCanvas.Children.Add(page);
PrintCanvas.InvalidateMeasure();
PrintCanvas.UpdateLayout();
//_printCanvas.Children.Add(page);
//_printCanvas.InvalidateMeasure();
//_printCanvas.UpdateLayout();
// Find the last text container and see if the content is overflowing
textLink = (RichTextBlockOverflow)page.FindName("ContinuationPageLinkedContainer");
// Check if this is the last page
if (!textLink.HasOverflowContent && textLink.Visibility == Windows.UI.Xaml.Visibility.Visible)
{
//StackPanel footer = (StackPanel)page.FindName("Footer");
//footer.Visibility = Windows.UI.Xaml.Visibility.Visible;
PrintCanvas.UpdateLayout();
_printCanvas.UpdateLayout();
}
// Add the page to the page preview collection
_printPreviewPages.Add(page);
return(textLink);
}