Fix flickering when using tools

1 files changed, 2 insertions, 0 deletions

diff --git a/noncore/graphics/drawpad/drawpadcanvas.cpp b/noncore/graphics/drawpad/drawpadcanvas.cpp
index 3ddd7b7..58192d3 100644
--- a/noncore/graphics/drawpad/drawpadcanvas.cpp
+++ b/noncore/graphics/drawpad/drawpadcanvas.cpp
@@ -1,534 +1,536 @@
 /***************************************************************************
  *                                                                         *
  *   DrawPad - a drawing program for Opie Environment                      *
  *                                                                         *
  *   (C) 2002 by S. Prud'homme <prudhomme@laposte.net>                     *
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
  *   it under the terms of the GNU General Public License as published by  *
  *   the Free Software Foundation; either version 2 of the License, or     *
  *   (at your option) any later version.                                   *
  *                                                                         *
  ***************************************************************************/
 
 #include "drawpadcanvas.h"
 
 #include "drawpad.h"
 #include "newpagedialog.h"
 #include "tool.h"
 
 #include <qpe/applnk.h>
 #include <qpe/filemanager.h>
 #include <qpe/mimetype.h>
 
 #include <qbuffer.h>
 #include <qimage.h>
 #include <qmessagebox.h>
 #include <qpainter.h>
 #include <qpixmap.h>
 #include <qtextcodec.h>
 #include <qtextstream.h>
 #include <qxml.h>
 
 #include <zlib.h>
 
 class DrawPadCanvasXmlHandler: public QXmlDefaultHandler
 {
 public:
     DrawPadCanvasXmlHandler();
     ~DrawPadCanvasXmlHandler();
 
     QList<QPixmap> pixmaps();
 
     bool startElement(const QString& namespaceURI, const QString& localName,
                       const QString& qName, const QXmlAttributes& atts);
     bool endElement(const QString& namespaceURI, const QString& localName,
                     const QString& qName);
     bool characters(const QString& ch);
 
 private:
     enum State {
         Unknown,
         InData
     };
 
     State m_state;
     ulong m_dataLenght;
     QString m_dataFormat;
     QList<QPixmap> m_pixmaps;
 };
 
 DrawPadCanvasXmlHandler::DrawPadCanvasXmlHandler()
 {
     m_state = Unknown;
 }
 
 DrawPadCanvasXmlHandler::~DrawPadCanvasXmlHandler()
 {
 }
 
 QList<QPixmap> DrawPadCanvasXmlHandler::pixmaps()
 {
     return m_pixmaps;
 }
 
 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.compare("data") == 0) {
         m_state = InData;
         m_dataLenght = atts.value("length").toULong();
         m_dataFormat = atts.value("format");
 
         if (m_dataFormat.isEmpty()) {
             m_dataFormat = "XPM";
         }
     }
 
     return true;
 }
 
 bool DrawPadCanvasXmlHandler::endElement(const QString& namespaceURI, const QString& localName,
                                          const QString& qName)
 {
     Q_CONST_UNUSED(namespaceURI)
     Q_CONST_UNUSED(localName)
 
     if (qName.compare("data") == 0) {
         m_state = Unknown;
     }
 
     return true;
 }
 
 bool DrawPadCanvasXmlHandler::characters(const QString& ch) 
 {
     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;
 
         if (m_dataFormat == "XPM") {
             if (m_dataLenght < ch.length() * 5) {
                 m_dataLenght = ch.length() * 5;
             }
 
             QByteArray byteArrayUnzipped(m_dataLenght);
             ::uncompress((uchar*)byteArrayUnzipped.data(), &m_dataLenght, (uchar*)byteArray.data(), byteArray.size());
 
             image.loadFromData((const uchar*)byteArrayUnzipped.data(), m_dataLenght, m_dataFormat);
         } else {
             image.loadFromData((const uchar*)byteArray.data(), m_dataLenght, m_dataFormat);
         }
 
         QPixmap* pixmap = new QPixmap(image.width(), image.height());
         pixmap->convertFromImage(image);
         m_pixmaps.append(pixmap);
     }
 
     return true;
 }
 
 DrawPadCanvas::DrawPadCanvas(DrawPad* drawPad, QWidget* parent, const char* name)
     : QScrollView(parent, name)
 {
     m_pDrawPad = drawPad;
     m_pages.setAutoDelete(true);
     m_pageBackups.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);
 
     m_pages = drawPadCanvasXmlHandler.pixmaps();
 
     if (m_pages.isEmpty()) {
         m_pages.append(new QPixmap(contentsRect().size()));
         m_pages.current()->fill(Qt::white);
     }
 
     m_pageBackups.clear();
     m_pageBackups.append(new QPixmap(*(m_pages.current())));
 
     resizeContents(m_pages.current()->width(), m_pages.current()->height());
     viewport()->update();
 
     emit pagesChanged();
     emit pageBackupsChanged();
 }
 
 void DrawPadCanvas::initialPage()
 {
     m_pages.append(new QPixmap(236, 232));
     m_pages.current()->fill(Qt::white);
 
     m_pageBackups.clear();
     m_pageBackups.append(new QPixmap(*(m_pages.current())));
 
     resizeContents(m_pages.current()->width(), m_pages.current()->height());
     viewport()->update();
 
     emit pagesChanged();
     emit pageBackupsChanged();
 }
 
 void DrawPadCanvas::save(QIODevice* ioDevice)
 {
     QTextStream textStream(ioDevice);
     textStream.setCodec(QTextCodec::codecForName("UTF-8"));
 
     textStream << "<drawpad>" << endl;
     textStream << "    <images>" << endl;
 
     QListIterator<QPixmap> bufferIterator(m_pages);
 
     for (bufferIterator.toFirst(); bufferIterator.current() != 0; ++bufferIterator) {
         textStream << "        <image>" << endl;
 
         QImage image = bufferIterator.current()->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)
 {
     QPixmap* importedPixmap = new QPixmap();
 
     importedPixmap->load(fileName);
     m_pages.insert(m_pages.at() + 1, importedPixmap);
 
     m_pageBackups.clear();
     m_pageBackups.append(new QPixmap(*(m_pages.current())));
 
     resizeContents(m_pages.current()->width(), m_pages.current()->height());
     viewport()->update();
 
     emit pagesChanged();
     emit pageBackupsChanged();
 }
 
 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()->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)->convertToImage();
             imageIO.setImage(image);
             imageIO.write();
             delete ioDevice;
         }
     }
 }
 
 QPixmap* DrawPadCanvas::currentPage()
 {
     return m_pages.current();
 }
 
 uint DrawPadCanvas::pagePosition()
 {
     return (m_pages.at() + 1);
 }
 
 uint DrawPadCanvas::pageCount()
 {
     return m_pages.count();
 }
 
 void DrawPadCanvas::deleteAll()
 {
    QMessageBox messageBox(tr("Delete All"), tr("Do you want to delete\nall the pages?"),
                            QMessageBox::Information, QMessageBox::Yes,
                            QMessageBox::No | QMessageBox::Escape | QMessageBox::Default,
                            QMessageBox::NoButton, this);
 
     if (messageBox.exec() == QMessageBox::Yes) {
         m_pages.clear();
 
         m_pages.append(new QPixmap(contentsRect().size()));
         m_pages.current()->fill(Qt::white);
 
         m_pageBackups.clear();
         m_pageBackups.append(new QPixmap(*(m_pages.current())));
 
         resizeContents(m_pages.current()->width(), m_pages.current()->height());
         viewport()->update();
 
         emit pagesChanged();
         emit pageBackupsChanged();
     }
 }
 
 void DrawPadCanvas::newPage()
 {
     QRect rect = contentsRect();
 
     NewPageDialog newPageDialog(rect.width(), rect.height(), m_pDrawPad->pen().color(),
                                 m_pDrawPad->brush().color(), this);
 
     if (newPageDialog.exec() == QDialog::Accepted) {
         m_pages.insert(m_pages.at() + 1, new QPixmap(newPageDialog.selectedWidth(),
                                                      newPageDialog.selectedHeight()));
         m_pages.current()->fill(newPageDialog.selectedColor());
 
         m_pageBackups.clear();
         m_pageBackups.append(new QPixmap(*(m_pages.current())));
 
         resizeContents(m_pages.current()->width(), m_pages.current()->height());
         viewport()->update();
 
         emit pagesChanged();
         emit pageBackupsChanged();
     }
 }
 
 void DrawPadCanvas::clearPage()
 {
     QMessageBox messageBox(tr("Clear Page"), tr("Do you want to clear\nthe current page?"),
                            QMessageBox::Information, QMessageBox::Yes,
                            QMessageBox::No | QMessageBox::Escape | QMessageBox::Default,
                            QMessageBox::NoButton, this);
 
     if (messageBox.exec() == QMessageBox::Yes) {
         m_pages.current()->fill(Qt::white);
 
         viewport()->update();
     }
 }
 
 void DrawPadCanvas::deletePage()
 {
    QMessageBox messageBox(tr("Delete Page"), tr("Do you want to delete\nthe current page?"),
                            QMessageBox::Information, QMessageBox::Yes,
                            QMessageBox::No | QMessageBox::Escape | QMessageBox::Default,
                            QMessageBox::NoButton, this);
 
     if (messageBox.exec() == QMessageBox::Yes) {
         m_pages.remove(m_pages.current());
 
         if (m_pages.isEmpty()) {
             m_pages.append(new QPixmap(contentsRect().size()));
             m_pages.current()->fill(Qt::white);
         }
 
         m_pageBackups.clear();
         m_pageBackups.append(new QPixmap(*(m_pages.current())));
 
         resizeContents(m_pages.current()->width(), m_pages.current()->height());
         viewport()->update();
 
         emit pagesChanged();
         emit pageBackupsChanged();
     }
 }
 
 bool DrawPadCanvas::undoEnabled()
 {
     return (m_pageBackups.current() != m_pageBackups.getFirst());
 }
 
 bool DrawPadCanvas::redoEnabled()
 {
     return (m_pageBackups.current() != m_pageBackups.getLast());
 }
 
 bool DrawPadCanvas::goPreviousPageEnabled()
 {
     return (m_pages.current() != m_pages.getFirst());
 }
 
 bool DrawPadCanvas::goNextPageEnabled()
 {
     return (m_pages.current() != m_pages.getLast());
 }
 
 void DrawPadCanvas::undo()
 {
     *(m_pages.current()) = *(m_pageBackups.prev());
 
     viewport()->update();
 
     emit pageBackupsChanged();
 }
 
 void DrawPadCanvas::redo()
 {
     *(m_pages.current()) = *(m_pageBackups.next());
 
     viewport()->update();
 
     emit pageBackupsChanged();
 }
 
 void DrawPadCanvas::goFirstPage()
 {
     m_pages.first();
     m_pageBackups.clear();
     m_pageBackups.append(new QPixmap(*(m_pages.current())));
 
     resizeContents(m_pages.current()->width(), m_pages.current()->height());
     viewport()->update();
 
     emit pagesChanged();
     emit pageBackupsChanged();
 }
 
 void DrawPadCanvas::goPreviousPage()
 {
     m_pages.prev();
     m_pageBackups.clear();
     m_pageBackups.append(new QPixmap(*(m_pages.current())));
 
     resizeContents(m_pages.current()->width(), m_pages.current()->height());
     viewport()->update();
 
     emit pagesChanged();
     emit pageBackupsChanged();
 }
 
 void DrawPadCanvas::goNextPage()
 {
     m_pages.next();
     m_pageBackups.clear();
     m_pageBackups.append(new QPixmap(*(m_pages.current())));
 
     resizeContents(m_pages.current()->width(), m_pages.current()->height());
     viewport()->update();
 
     emit pagesChanged();
     emit pageBackupsChanged();
 }
 
 void DrawPadCanvas::goLastPage()
 {
     m_pages.last();
     m_pageBackups.clear();
     m_pageBackups.append(new QPixmap(*(m_pages.current())));
 
     resizeContents(m_pages.current()->width(), m_pages.current()->height());
     viewport()->update();
 
     emit pagesChanged();
     emit pageBackupsChanged();
 }
 
 void DrawPadCanvas::contentsMousePressEvent(QMouseEvent* e)
 {
     m_pDrawPad->tool()->mousePressEvent(e);
 }
 
 void DrawPadCanvas::contentsMouseReleaseEvent(QMouseEvent* e)
 {
     m_pDrawPad->tool()->mouseReleaseEvent(e);
 
     QPixmap* currentBackup = m_pageBackups.current();
     while (m_pageBackups.last() != currentBackup) {
         m_pageBackups.removeLast();
     }
 
     while (m_pageBackups.count() >= (5 + 1)) {
         m_pageBackups.removeFirst();
     }
 
     m_pageBackups.append(new QPixmap(*(m_pages.current())));
 
     emit pageBackupsChanged();
 }
 
 void DrawPadCanvas::contentsMouseMoveEvent(QMouseEvent* e)
 {
     m_pDrawPad->tool()->mouseMoveEvent(e);
 }
 
 void DrawPadCanvas::drawContents(QPainter* p, int cx, int cy, int cw, int ch)
 {
     QRect clipRect(cx, cy, cw, ch);
 
     p->drawPixmap(clipRect.topLeft(), *(m_pages.current()), clipRect);
 }