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added HTML printing

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4030 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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Václav Slavík
1999-10-17 13:03:40 +00:00
parent 30760ce7e5
commit 3ce369e687
25 changed files with 1568 additions and 538 deletions
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67
docs/latex/wx/htmlprn.tex
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@@ -1,63 +1,14 @@
\membersection{Printing}\label{printing}
\membersection{HTML Printing}\label{printing}
The wxHTML library provides printing facilities.
The wxHTML library provides printing facilities with several levels of complexity.
You can redirect output displayed by \helpref{wxHtmlWindow}{wxhtmlwindow}
to the printer DC using this (or similar) code (see {\bf printing} sample for
more details) :
The easiest way to print an HTML document is to use
\helpref{wxHtmlEasyPrinting class}{wxhtmleasyprinting}. It lets you print HTML documents with only one
command and you don't have to care about wxPrintouts etc. at all. It is only simple wrapper around
\helpref{wxHtmlPrintout}{wxhtmlprintout}, normal wxWindows printout class.
\begin{verbatim}
//
// This method prints page number one to dc:
//
void MyPrintout::DrawPageOne(wxDC *dc)
{
int leftMargin = 20;
int topMargin = 50;
// You must compute the margins there.
// Caution! These values are NOT in printer DC's units.
// These values are in screen pixels.
// (see bellow)
// Here we obtain internal cell representation of HTML document:
// (html is our pointer to wxHtmlWindow object)
wxHtmlContainerCell *cell = html -> GetInternalRepresentation();
// Now we have to check in case our real page size is reduced
// (e.g. because we're drawing to a print preview memory DC)
int pageWidth, pageHeight;
int w, h;
dc->GetSize(&w, &h); // DC size
GetPageSizePixels(&pageWidth, &pageHeight); // real size
// Now we must scale it. This equation will map wxHtmlWindow
// to page in this way:
// |--this is whole page as printed---------|
// | | | |
// | | | |
// |-margin-|-----wxHtmlWindow-----|-margin-|
//
// So page width is 2*leftMargin + [wxHtmlWindow size]
// (measured in screen pixels).
// We will scale the printer DC so that wxHtmlWindow's content
// spreads from left to right:
float scale = (float)(
(float)(pageWidth) /
(float)(2 * leftMargin + cell -> GetMaxLineWidth()));
// If printer pageWidth == current DC width, then this doesn't
// change. But w might be the preview bitmap width, so scale down.
float overallScale = scale * (float)(w/(float)pageWidth);
// Set the user scale so that our computations take effect:
dc->SetUserScale(overallScale, overallScale);
dc->SetBackgroundMode(wxTRANSPARENT);
// And this is - finally - HTML stuff:
cell -> Draw(*dc, leftMargin, topMargin, 0, cell -> GetHeight());
}
\end{verbatim}
(Thanks to Julian Smart for sample)
And finally there is low level class \helpref{wxHtmlDCRenderer}{wxhtmldcrenderer} which you can use to
render HTML into rectangular area on any DC. It supports rendering into multiple rectangles with same
width. (Most common use is placing one rectangle on each page or printing into two columns.)