Bug 29863 – [Qt] Additional Functionality for QWebKit + Patch

• Status: RESOLVED
• Resolution: DUPLICATE
• Component: Printing

[Tor Arne Vestbø]

This bug report originated from issue QTBUG-3896
http://bugreports.qt.nokia.com/browse/QTBUG-3896

--- Description ---

The following suggestion and patch depends on suggestions:
250464
250466
250469

To print extra stuff, like page numbers, dates and the likes, 
QWebFrame is made to emit a signal for each page Printing.  
Support is added to the QWebFrame function, to use an existing 
QPainter object, so that one can print multiple web pages into 
one document (or a web page and something else). Since a 
web page can now be printed as a part of a document. The 
countPages function is added to the QWebFrame object, to 
figure out how many pages will actually be printed by "print".  
A boolean indicator is added to the print method tho specify 
if you want to use the screen or the print mediatype. 
qtwebkit does not expose DOM, and even if it did there would 
in all likely hood be no way of given a DOM element to figure 
out where it would be printed. Therefor the headings method is 
added, it will return a list of "h?" element in the DOM, 
containing their text, the level (the ? part of h?). The 
location in screen coordinates. The page on which they are 
printed, and the location they are printed on the page 
(0.0,0.0) again being left-top, and (1.0,1.0) being the 
right-bottom. This can obviously be coupled quite nicely with 
the pdf outline patch(task #250464).

Patch:
diff -ur qt-x11-opensource-src-4.5.0-old/src/3rdparty/webkit/WebKit/qt/Api/qwebframe.cpp qt-x11-opensource-src-4.5.0/src/3rdparty/webkit/WebKit/qt/Api/qwebframe.cpp
--- qt-x11-opensource-src-4.5.0-old/src/3rdparty/webkit/WebKit/qt/Api/qwebframe.cpp 2009-02-25 22:09:21.000000000 +0100
+++ qt-x11-opensource-src-4.5.0/src/3rdparty/webkit/WebKit/qt/Api/qwebframe.cpp 2009-03-14 10:24:02.000000000 +0100
@@ -75,6 +75,7 @@
 #include <qevent.h>
 #include <qfileinfo.h>
 #include <qpainter.h>
+#include <qprintengine.h>
 #include <QMultiMap>
 #if QT_VERSION >= 0x040400
 #include <qnetworkrequest.h>
@@ -886,16 +887,114 @@
 }
 
 #ifndef QT_NO_PRINTER
+struct HeadingsGenerator {
+    QVector<QWebFrame::Heading> res;
+    HeadingsGenerator(): res() {};
+        
+    static QPoint getObjectLocation(RenderObject * r) {
+  int x=0;
+  int y=r->height()/2;
+  while(r) {
+   x += r->xPos();
+   y += r->yPos();
+   r = r->parent();
+  }
+        return QPoint(x,y);
+    }
+
+    static void extractText(Node * n, QString & text) {
+        text.append(n->nodeValue());
+        for(Node *i=n->firstChild(); i != NULL; i = i->nextSibling())
+        extractText(i,text);
+    }
+                                               
+    bool addHeading(Node * n) {
+        if(!n || n->nodeName()[0] != 'H' || '1' > n->nodeName()[1] || n->nodeName()[1] > '6') return false;
+        QWebFrame::Heading h;
+        h.text = QString();
+        h.page = 1;
+        h.locationOnPage = QPointF();
+        h.level = n->nodeName()[1]-'0';
+        extractText(n,h.text);
+        h.text = h.text.simplified();
+        h.location = getObjectLocation(n->renderer());
+        res.push_back(h);
+        return true;
+    }
+
+    void visitNode(Node * n) {
+        if(!addHeading(n)) 
+            for(Node * i=n->firstChild(); i != NULL; i = i->nextSibling())
+                visitNode(i);
+    }
+};
+
+QVector<QWebFrame::Heading> QWebFrame::headings(QPrinter * printer, bool usePrintMediaType) {
+    HeadingsGenerator gen;
+    if(!printer) {
+        gen.visitNode(d->frame->document());
+        return gen.res;
+    }
+    const qreal zoomFactorX = printer->logicalDpiX() / qt_defaultDpi();
+    const qreal zoomFactorY = printer->logicalDpiY() / qt_defaultDpi();
+        
+    PrintContext printContext(d->frame);
+    float pageHeight = 0;
+    QRect qprinterRect = printer->pageRect();
+    IntRect pageRect(0, 0,
+                     int(qprinterRect.width() / zoomFactorX),
+                     int(qprinterRect.height() / zoomFactorY));
+    printContext.begin(pageRect.width(), usePrintMediaType);
+    printContext.computePageRects(pageRect, 0, 0, 1.0, pageHeight);
+    
+    const Vector<IntRect> & pageRects = printContext.getPageRects();
+    QMap<float, uint> pageEnd;
+    for(uint i=0; i < pageRects.size(); ++i) pageEnd[pageRects[i].bottom()] = i;
+    for(RenderObject * o=d->frame->document()->renderer(); o; o=o->nextInPreOrder()) 
+        if(gen.addHeading(o->node())) {
+            QWebFrame::Heading & h = gen.res.back(); 
+            h.locationOnPage = gen.getObjectLocation(o);
+            QMap<float, uint>::const_iterator pageI = pageEnd.upperBound(h.locationOnPage.y());            
+            h.page=(pageI == pageEnd.end())?pageRects.size()-1:pageI.value();
+            h.locationOnPage -= QPointF(0,pageRects[h.page].y());
+            h.locationOnPage= QPointF(h.locationOnPage.x() / pageRects[h.page].x(),
+                                      h.locationOnPage.y() / pageRects[h.page].y());
+        }
+    printContext.end();
+    return gen.res;
+}
+
+uint QWebFrame::countPages(QPrinter *printer, bool usePrintMediaType) {
+    const qreal zoomFactorX = printer->logicalDpiX() / qt_defaultDpi();
+    const qreal zoomFactorY = printer->logicalDpiY() / qt_defaultDpi();
+
+    PrintContext printContext(d->frame);
+    float pageHeight = 0;
+
+    QRect qprinterRect = printer->pageRect();
+
+    IntRect pageRect(0, 0,
+                     int(qprinterRect.width() / zoomFactorX),
+                     int(qprinterRect.height() / zoomFactorY));
+
+    printContext.begin(pageRect.width(), usePrintMediaType);
+    printContext.computePageRects(pageRect, /*headerHeight*/0, /*footerHeight*/0, /*userScaleFactor*/1.0, pageHeight);
+    uint count = printContext.pageCount();
+    printContext.end();
+    return count;
+}
+
 /*!
     Prints the frame to the given \a printer.
 
     \sa render()
 */
-void QWebFrame::print(QPrinter *printer) const
+void QWebFrame::print(QPrinter *printer, QPainter * painter, bool usePrintMediaType) const
 {
-    QPainter painter;
-    if (!painter.begin(printer))
-        return;
+    QPainter * ipainter = painter;
+    if(!ipainter) ipainter = new QPainter();
+    if(!ipainter->isActive()) ipainter->begin(printer);
+    ipainter->save();
 
     const qreal zoomFactorX = printer->logicalDpiX() / qt_defaultDpi();
     const qreal zoomFactorY = printer->logicalDpiY() / qt_defaultDpi();
@@ -909,7 +999,7 @@
                      int(qprinterRect.width() / zoomFactorX),
                      int(qprinterRect.height() / zoomFactorY));
 
-    printContext.begin(pageRect.width());
+    printContext.begin(pageRect.width(), usePrintMediaType);
 
     printContext.computePageRects(pageRect, /*headerHeight*/0, /*footerHeight*/0, /*userScaleFactor*/1.0, pageHeight);
 
@@ -942,8 +1032,8 @@
         ascending = false;
     }
 
-    painter.scale(zoomFactorX, zoomFactorY);
-    GraphicsContext ctx(&painter);
+    ipainter->scale(zoomFactorX, zoomFactorY);
+    GraphicsContext ctx(ipainter);
 
     for (int i = 0; i < docCopies; ++i) {
         int page = fromPage;
@@ -955,10 +1045,13 @@
                     return;
                 }
                 printContext.spoolPage(ctx, page - 1, pageRect.width());
-                if (j < pageCopies - 1)
+                if (j < pageCopies - 1) {
+                    emit printingNewPage(printer,fromPage,toPage,page);
                     printer->newPage();
+                }
             }
-
+            emit printingNewPage(printer,fromPage,toPage,page);
+        
             if (page == toPage)
                 break;
 
@@ -975,6 +1068,8 @@
     }
 
     printContext.end();
+    ipainter->restore();
+    if(ipainter != painter) delete ipainter;
 }
 #endif // QT_NO_PRINTER
 
diff -ur qt-x11-opensource-src-4.5.0-old/src/3rdparty/webkit/WebKit/qt/Api/qwebframe.h qt-x11-opensource-src-4.5.0/src/3rdparty/webkit/WebKit/qt/Api/qwebframe.h
--- qt-x11-opensource-src-4.5.0-old/src/3rdparty/webkit/WebKit/qt/Api/qwebframe.h 2009-02-25 22:09:21.000000000 +0100
+++ qt-x11-opensource-src-4.5.0/src/3rdparty/webkit/WebKit/qt/Api/qwebframe.h 2009-03-14 10:23:07.000000000 +0100
@@ -115,6 +117,14 @@
 public:
     QWebPage *page() const;
 
+    struct Heading {
+        QString text;
+        uint level;
+        QPoint location;
+        uint page;
+        QPointF locationOnPage;
+    };
+
     void load(const QUrl &url);
 #if QT_VERSION < 0x040400
     void load(const QWebNetworkRequest &request);
@@ -174,10 +184,13 @@
 
     QWebSecurityOrigin securityOrigin() const;
 
+    QVector<Heading> headings(QPrinter * printer=NULL, bool usePrintMediaType=true);
+    uint countPages(QPrinter *printer, bool usePrintMediaType=true);
+
 public Q_SLOTS:
     QVariant evaluateJavaScript(const QString& scriptSource);
 #ifndef QT_NO_PRINTER
-    void print(QPrinter *printer) const;
+    void print(QPrinter *printer, QPainter * painter=NULL, bool usePrintMediaType=true) const;
 #endif
 
 Q_SIGNALS:
@@ -191,6 +204,7 @@
 
     void iconChanged();
 
+    void printingNewPage(QPrinter *p, int fromPage, int toPage, int Page) const;
 private:
     friend class QWebPage;
     friend class QWebPagePrivate;

[Simon Hausmann]

*** This bug has been marked as a duplicate of bug 26584 ***