projects / wxWidgets.git / blame
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|---|---|---|
| 704a4b75 VS |
1 | \membersection{Printing}\label{printing} |
| 2 | ||
| 3 | The wxHTML library provides printing facilities. | |
| 4 | ||
| 5 | You can redirect output displayed by \helpref{wxHtmlWindow}{wxhtmlwindow} | |
| 6 | to the printer DC using this (or similar) code (see {\bf printing} sample for | |
| 7 | more details) : | |
| 8 | ||
| 9 | \begin{verbatim} | |
| 10 | // | |
| 11 | // This method prints page number one to dc: | |
| 12 | // | |
| 13 | ||
| 14 | void MyPrintout::DrawPageOne(wxDC *dc) | |
| 15 | { | |
| 16 | int leftMargin = 20; | |
| 17 | int topMargin = 50; | |
| 18 | // You must compute the margins there. | |
| 19 | // Caution! These values are NOT in printer DC's units. | |
| 20 | // These values are in screen pixels. | |
| 21 | // (see bellow) | |
| 22 | ||
| 23 | // Here we obtain internal cell representation of HTML document: | |
| 24 | // (html is our pointer to wxHtmlWindow object) | |
| 25 | wxHtmlContainerCell *cell = html -> GetInternalRepresentation(); | |
| 26 | ||
| 27 | // Now we have to check in case our real page size is reduced | |
| 28 | // (e.g. because we're drawing to a print preview memory DC) | |
| 29 | int pageWidth, pageHeight; | |
| 30 | int w, h; | |
| 31 | dc->GetSize(&w, &h); // DC size | |
| 32 | GetPageSizePixels(&pageWidth, &pageHeight); // real size | |
| 33 | ||
| 34 | // Now we must scale it. This equation will map wxHtmlWindow | |
| 35 | // to page in this way: | |
| 36 | // |--this is whole page as printed---------| | |
| 37 | // | | | | | |
| 38 | // | | | | | |
| 39 | // |-margin-|-----wxHtmlWindow-----|-margin-| | |
| 40 | // | |
| 41 | // So page width is 2*leftMargin + [wxHtmlWindow size] | |
| 42 | // (measured in screen pixels). | |
| 43 | // We will scale the printer DC so that wxHtmlWindow's content | |
| 44 | // spreads from left to right: | |
| 45 | float scale = (float)( | |
| 46 | (float)(pageWidth) / | |
| 47 | (float)(2 * leftMargin + cell -> GetMaxLineWidth())); | |
| 48 | ||
| 49 | // If printer pageWidth == current DC width, then this doesn't | |
| 50 | // change. But w might be the preview bitmap width, so scale down. | |
| 51 | float overallScale = scale * (float)(w/(float)pageWidth); | |
| 52 | ||
| 53 | // Set the user scale so that our computations take effect: | |
| 54 | dc->SetUserScale(overallScale, overallScale); | |
| 55 | dc->SetBackgroundMode(wxTRANSPARENT); | |
| 56 | ||
| 57 | // And this is - finally - HTML stuff: | |
| 58 | cell -> Draw(*dc, leftMargin, topMargin, 0, cell -> GetHeight()); | |
| 59 | } | |
| 60 | \end{verbatim} | |
| 61 | ||
| 62 | (Thanks to Julian Smart for sample) | |
| 22d6efa8 | 63 |