Hi all,
We have moved to Silverlight 4 due to the printing capability. I have been
working on the best way
to enable printing in my application. I have settled on writing page components
to Bitmaps, then
slotting those bitmaps into a page template control (printTemplate) and
printing that. It's all been
working fine except that now I have hit a problem.
I have a tab control. The tab control has a number of tabs. When I click the
Print button that I
have added to the page, it works it's way through all the tabs and prints a
report that contains the
content. Now, it works fine if I have clicked on all the tabs before-hand,
however if I do not click
the tabs beforehand, then the content of those tabs will not get generated
within the report.
However, if I set the element directly into e.PageVisual, then the element will
display.
I believe this is happening because the bitmap does not render from a tab that
has not been made
visible prior to clicking Print.
I have attached some code below and it is still a work in progress. Most of my
printing involves
Landscape orientation, and if I set it to Portrait, or set e.PageLayout =
elementToPrint, then the
element will clip, which is undesireable.
How can I get an element to render inside a bitmap without the element needing
to be visible first?
Regards,
Tony
private void PrintPage(FrameworkElement elementToPrint, PrintPageEventArgs e,
string
headingTitle, string footerTitle, PageOrientation orientation =
PageOrientation.Portrait)
{
PrintTemplateControl printTemplate = new PrintTemplateControl();
printTemplate.SetHeaderAndFooterText(headingTitle, footerTitle);
double printableHeight = e.PrintableArea.Height -
printTemplate.HeightOffset;
int contentWidth = Convert.ToInt32(elementToPrint.ActualWidth);
int contentHeight = Convert.ToInt32(elementToPrint.ActualHeight);
WriteableBitmap bitmap;
if (orientation == PageOrientation.Portrait)
{
bitmap = new WriteableBitmap(contentWidth, contentHeight);
bitmap.Render(elementToPrint,new TranslateTransform());
}
else
{
bitmap = new WriteableBitmap(contentHeight, contentWidth);
TransformGroup transformGroup = new TransformGroup();
RotateTransform rotateTransform = new RotateTransform();
rotateTransform.Angle = 90;
transformGroup.Children.Add(rotateTransform);
TranslateTransform moveTransform = new TranslateTransform();
moveTransform.X = contentHeight;
transformGroup.Children.Add(moveTransform);
ScaleTransform scaleTransform = new ScaleTransform();
double ratioOfImageToPrintArea = 1;
if (elementToPrint.ActualWidth > printableHeight)
ratioOfImageToPrintArea = printableHeight /
elementToPrint.ActualWidth;
scaleTransform.ScaleX = ratioOfImageToPrintArea;
scaleTransform.ScaleY = ratioOfImageToPrintArea;
transformGroup.Children.Add(scaleTransform);
bitmap.Render(elementToPrint, transformGroup);
}
bitmap.Invalidate();
Image printImageSource = new Image();
printImageSource.Source = bitmap;
printImageSource.Width = bitmap.PixelWidth;
printImageSource.Height = bitmap.PixelHeight;
printTemplate.AddChildren(printImageSource);
e.PageVisual = printTemplate;
}
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