Problem: Opie-Drawpad loads its document delayed. This means a setDocument

like from the Screenshot Applet could be executed prior to the final
initialisation of drawpad and the just added page vanishes.

Solve: Take the fact into account and 1st) don't create an empty page
if there is already a page which is the case with the setDocument call
2nd) if we load but already have pages we need to add the new pages

1 files changed, 23 insertions, 0 deletions

diff --git a/noncore/graphics/drawpad/drawpadcanvas.cpp b/noncore/graphics/drawpad/drawpadcanvas.cpp
index 5d0c6e4..5b1aa7e 100644
--- a/noncore/graphics/drawpad/drawpadcanvas.cpp
+++ b/noncore/graphics/drawpad/drawpadcanvas.cpp
@@ -52,273 +52,296 @@ private:
     QString m_title;
     QDateTime m_date;
     ulong m_dataLenght;
     QString m_dataFormat;
     QList<Page> m_pages;
 };
 
 DrawPadCanvasXmlHandler::DrawPadCanvasXmlHandler()
 {
     m_state = Unknown;
 }
 
 DrawPadCanvasXmlHandler::~DrawPadCanvasXmlHandler()
 {
 }
 
 QList<Page> DrawPadCanvasXmlHandler::pages()
 {
     return m_pages;
 }
 
 bool DrawPadCanvasXmlHandler::startElement(const QString& namespaceURI, const QString& localName,
                                            const QString& qName, const QXmlAttributes& atts)
 {
     Q_CONST_UNUSED(namespaceURI)
     Q_CONST_UNUSED(localName)
 
     if (qName == "image") {
         m_title = QString();
         m_date = QDateTime::currentDateTime();
     } else if (qName == "title") {
         m_state = InTitle;
     } else if (qName == "date") {
         m_state = InDate;
     } else if (qName == "data") {
         m_state = InData;
         m_dataLenght = atts.value("length").toULong();
         m_dataFormat = atts.value("format");
     }
 
     return true;
 }
 
 bool DrawPadCanvasXmlHandler::endElement(const QString& namespaceURI, const QString& localName,
                                          const QString& qName)
 {
     Q_CONST_UNUSED(namespaceURI)
     Q_CONST_UNUSED(localName)
 
     if (qName == "title") {
         m_state = Unknown;
     } else if (qName == "date") {
         m_state = Unknown;
     } else if (qName == "data") {
         m_state = Unknown;
     }
 
     return true;
 }
 
 bool DrawPadCanvasXmlHandler::characters(const QString& ch)
 {
     if (m_state == InTitle) {
         m_title = ch;
     } else if (m_state == InDate) {
         m_date = QDateTime(QDate(1970, 1, 1)).addSecs(ch.toInt());
     } else if (m_state == InData) {
         QByteArray byteArray(ch.length() / 2);
 
         for (int i = 0; i < (int)ch.length() / 2; i++) {
             char h = ch[2 * i].latin1();
             char l = ch[2 * i  + 1].latin1();
             uchar r = 0;
 
             if (h <= '9') {
                 r += h - '0';
             } else {
                 r += h - 'a' + 10;
             }
 
             r = r << 4;
 
             if (l <= '9') {
                 r += l - '0';
             } else {
                 r += l - 'a' + 10;
             }
 
             byteArray[i] = r;
         }
 
         QImage image;
         image.loadFromData((const uchar*)byteArray.data(), m_dataLenght, m_dataFormat);
 
         Page* page = new Page(m_title, image.width(), image.height());
         page->setLastModified(m_date);
         page->pixmap()->convertFromImage(image);
         m_pages.append(page);
     }
 
     return true;
 }
 
 DrawPadCanvas::DrawPadCanvas(DrawPad* drawPad, QWidget* parent, const char* name)
     : QScrollView(parent, name)
 {
     m_pDrawPad = drawPad;
     m_pages.setAutoDelete(true);
 
     viewport()->setBackgroundMode(QWidget::NoBackground);
 }
 
 DrawPadCanvas::~DrawPadCanvas()
 {
 }
 
 void DrawPadCanvas::load(QIODevice* ioDevice)
 {
     QTextStream textStream(ioDevice);
     textStream.setCodec(QTextCodec::codecForName("UTF-8"));
 
     QXmlInputSource xmlInputSource(textStream);
     QXmlSimpleReader xmlSimpleReader;
     DrawPadCanvasXmlHandler drawPadCanvasXmlHandler;
 
     xmlSimpleReader.setContentHandler(&drawPadCanvasXmlHandler);
     xmlSimpleReader.parse(xmlInputSource);
 
+    /*
+     * we could have loaded something from setDocument already
+     * due the delayed loading we need to make sure we do
+     * not lose pages
+     */
+    if ( !m_pages.isEmpty() ) {
+        QList<Page> pages = drawPadCanvasXmlHandler.pages();
+        QListIterator<Page> it( pages );
+        Page *p;
+        while (  ( p = it.current() ) ) {
+            ++it;
+            m_pages.append( p );
+        }
+    }else
     m_pages = drawPadCanvasXmlHandler.pages();
 
+
+
     if (m_pages.isEmpty()) {
         m_pages.append(new Page("",
 		clipper()->width()+(verticalScrollBar()->isVisible()?verticalScrollBar()->width():0),
 	        clipper()->height()+(horizontalScrollBar()->isVisible()?horizontalScrollBar()->height():0)));
         m_pages.current()->pixmap()->fill(Qt::white);
     }
 
     resizeContents(m_pages.current()->pixmap()->width(), m_pages.current()->pixmap()->height());
     viewport()->update();
 
     emit pagesChanged();
 }
 
 void DrawPadCanvas::initialPage()
 {
+    /*
+     * by setDocument we've set a page already so
+     * don't add an empty one. This comes due the delayed initialisation
+     */
+    if (!m_pages.isEmpty() )
+        return;
+
     m_pages.append(new Page("",
 	clipper()->width()+(verticalScrollBar()->isVisible()?verticalScrollBar()->width():0),
 	clipper()->height()+(horizontalScrollBar()->isVisible()?horizontalScrollBar()->height():0)));
 	//236, 232)); no more fixed sizes
 
     m_pages.current()->pixmap()->fill(Qt::white);
 
     resizeContents(m_pages.current()->pixmap()->width(), m_pages.current()->pixmap()->height());
     viewport()->update();
 
     emit pagesChanged();
 }
 
 void DrawPadCanvas::save(QIODevice* ioDevice)
 {
     QTextStream textStream(ioDevice);
     textStream.setCodec(QTextCodec::codecForName("UTF-8"));
 
     textStream << "<drawpad>" << endl;
     textStream << "    <images>" << endl;
 
     QListIterator<Page> bufferIterator(m_pages);
 
     for (bufferIterator.toFirst(); bufferIterator.current() != 0; ++bufferIterator) {
         textStream << "        <image>" << endl;
         textStream << "            <title>" << bufferIterator.current()->title() << "</title>" << endl;
 
         int intDate = QDateTime(QDate(1970, 1, 1)).secsTo(bufferIterator.current()->lastModified());
         textStream << "            <date>" << intDate << "</date>" << endl;
 
         QImage image = bufferIterator.current()->pixmap()->convertToImage();
         QByteArray byteArray;
         QBuffer buffer(byteArray);
         QImageIO imageIO(&buffer, "PNG");
 
         buffer.open(IO_WriteOnly);
         imageIO.setImage(image);
         imageIO.write();
         buffer.close();
 
         textStream << "            <data length=\"" << byteArray.size() << "\" format=\"PNG\">";
 
         static const char hexchars[] = "0123456789abcdef";
 
         for (int i = 0; i < (int)byteArray.size(); i++ ) {
             uchar s = (uchar)byteArray[i];
             textStream << hexchars[s >> 4];
             textStream << hexchars[s & 0x0f];
         }
 
         textStream << "</data>" << endl;
         textStream << "        </image>" << endl;
     }
 
     textStream << "    </images>" << endl;
     textStream << "</drawpad>";
 }
 
 void DrawPadCanvas::importPage(const QString& fileName)
 {
     Page* importedPage = new Page();
 
     importedPage->pixmap()->load(fileName);
     m_pages.insert(m_pages.at() + 1, importedPage);
 
     resizeContents(m_pages.current()->pixmap()->width(), m_pages.current()->pixmap()->height());
     viewport()->update();
 
     emit pagesChanged();
 }
 
 void DrawPadCanvas::importPixmap( const QPixmap& pix ) {
     Page* importedPage = new Page();
 
     (*importedPage->pixmap()) = pix;
     m_pages.insert(m_pages.at()+1, importedPage );
     resizeContents(m_pages.current()->pixmap()->width(),
                    m_pages.current()->pixmap()->height() );
     viewport()->update();
 
     emit pagesChanged();
 }
 
 void DrawPadCanvas::exportPage(uint fromPage, uint toPage, const QString& name,const QString& format)
 {
     if (fromPage == toPage) {
         DocLnk docLnk;
         MimeType mimeType(format);
 
         docLnk.setName(name);
         docLnk.setType(mimeType.id());
 
         FileManager fileManager;
         QIODevice* ioDevice = fileManager.saveFile(docLnk);
         QImageIO imageIO(ioDevice, format);
 
         QImage image = m_pages.current()->pixmap()->convertToImage();
         imageIO.setImage(image);
         imageIO.write();
         delete ioDevice;
     } else {
         for (uint i = fromPage; i <= toPage; i++) {
             DocLnk docLnk;
             MimeType mimeType(format);
 
             docLnk.setName(name + QString::number(i));
             docLnk.setType(mimeType.id());
 
             FileManager fileManager;
             QIODevice* ioDevice = fileManager.saveFile(docLnk);
             QImageIO imageIO(ioDevice, format);
 
             QImage image = m_pages.at(i - 1)->pixmap()->convertToImage();
             imageIO.setImage(image);
             imageIO.write();
             delete ioDevice;
         }
     }
 }
 
 Page* DrawPadCanvas::currentPage()
 {
     return m_pages.current();
 }
 
 QList<Page> DrawPadCanvas::pages()
 {
     return m_pages;