C++ iterator::atEnd方法代码示例

int TextDocumentStructureModel::rowCount(const QModelIndex &index) const
{
    kDebug(32500) << "-------------------------- index:"<<index<<m_textDocument;
    if (! m_textDocument) {
        return 0;
    }

    if (! index.isValid()) {
        // one root frame
        return 1;
    }

    Q_ASSERT(index.internalId() < uint(m_nodeDataTable.count()));

    const NodeData &nodeData = m_nodeDataTable.at(index.internalId());

    if (nodeData.type == NodeData::Frame) {
        QTextFrame* frame = nodeData.frame;

        // count frames and blocks
        int count = 0;
        for (QTextFrame::iterator iterator = frame->begin(); !iterator.atEnd(); ++iterator) {
            ++count;
        }
        return count;
    }

    // should be a block then, no childs for now
    return 0;
}

void XmlWriter::processFrame(QDomElement &parent, QTextFrame *frame)
{
    QDomElement frameElement = document->createElement("frame");
    frameElement.setAttribute("begin", frame->firstPosition());
    frameElement.setAttribute("end", frame->lastPosition());
    parent.appendChild(frameElement);

//! [0]
    QTextFrame::iterator it;
    for (it = frame->begin(); !(it.atEnd()); ++it) {

        QTextFrame *childFrame = it.currentFrame();
        QTextBlock childBlock = it.currentBlock();

        if (childFrame) {
            QTextTable *childTable = qobject_cast<QTextTable*>(childFrame);

            if (childTable)
                processTable(frameElement, childTable);
            else
                processFrame(frameElement, childFrame);

        } else if (childBlock.isValid())
//! [0] //! [1]
            processBlock(frameElement, childBlock);
    }
//! [1]
}

void QTextOdfWriter::writeFrame(QXmlStreamWriter &writer, const QTextFrame *frame)
{
    Q_ASSERT(frame);
    const QTextTable *table = qobject_cast<const QTextTable*> (frame);

    if (table) { // Start a table.
        writer.writeStartElement(tableNS, QString::fromLatin1("table"));
        writer.writeEmptyElement(tableNS, QString::fromLatin1("table-column"));
        writer.writeAttribute(tableNS, QString::fromLatin1("number-columns-repeated"), QString::number(table->columns()));
    } else if (frame->document() && frame->document()->rootFrame() != frame) { // start a section
        writer.writeStartElement(textNS, QString::fromLatin1("section"));
    }

    QTextFrame::iterator iterator = frame->begin();
    QTextFrame *child = 0;

    int tableRow = -1;
    while (! iterator.atEnd()) {
        if (iterator.currentFrame() && child != iterator.currentFrame())
            writeFrame(writer, iterator.currentFrame());
        else { // no frame, its a block
            QTextBlock block = iterator.currentBlock();
            if (table) {
                QTextTableCell cell = table->cellAt(block.position());
                if (tableRow < cell.row()) {
                    if (tableRow >= 0)
                        writer.writeEndElement(); // close table row
                    tableRow = cell.row();
                    writer.writeStartElement(tableNS, QString::fromLatin1("table-row"));
                }
                writer.writeStartElement(tableNS, QString::fromLatin1("table-cell"));
                if (cell.columnSpan() > 1)
                    writer.writeAttribute(tableNS, QString::fromLatin1("number-columns-spanned"), QString::number(cell.columnSpan()));
                if (cell.rowSpan() > 1)
                    writer.writeAttribute(tableNS, QString::fromLatin1("number-rows-spanned"), QString::number(cell.rowSpan()));
                if (cell.format().isTableCellFormat()) {
                    writer.writeAttribute(tableNS, QString::fromLatin1("style-name"), QString::fromLatin1("T%1").arg(cell.tableCellFormatIndex()));
                }
            }
            writeBlock(writer, block);
            if (table)
                writer.writeEndElement(); // table-cell
        }
        child = iterator.currentFrame();
        ++iterator;
    }
    if (tableRow >= 0)
        writer.writeEndElement(); // close table-row

    if (table || (frame->document() && frame->document()->rootFrame() != frame))
        writer.writeEndElement();  // close table or section element
}

void QSGTextNode::addTextDocument(const QPointF &position, QTextDocument *textDocument, const QColor &color,
                                  QSGText::TextStyle style, const QColor &styleColor)
{
    Q_UNUSED(position)
    QTextFrame *textFrame = textDocument->rootFrame();
    QPointF p = textDocument->documentLayout()->frameBoundingRect(textFrame).topLeft();

    QTextFrame::iterator it = textFrame->begin();
    while (!it.atEnd()) {
        addTextBlock(p, textDocument, it.currentBlock(), color, style, styleColor);
        ++it;
    }
}

// 遍历框架
void MainWindow::showTextFrame()
{
    QTextDocument *document = ui->textEdit->document();
    QTextFrame *frame = document->rootFrame();
    // 建立QTextFrame类的迭代器
    QTextFrame::iterator it;
    for (it = frame->begin(); !(it.atEnd()); ++it) {
         // 获取当前框架的指针
         QTextFrame *childFrame = it.currentFrame();
         // 获取当前文本块
         QTextBlock childBlock = it.currentBlock();
         if (childFrame)
             qDebug() << "frame";
         else if (childBlock.isValid())
             qDebug() << "block:" << childBlock.text();
    }
}

QModelIndex TextDocumentStructureModel::parent(const QModelIndex &index) const
{
    kDebug(32500) << "-------------------------- index:"<<index<<m_textDocument;
    if (! m_textDocument || ! index.isValid()) {
        return QModelIndex();
    }

    Q_ASSERT(index.internalId() < uint(m_nodeDataTable.count()));

    const NodeData &nodeData = m_nodeDataTable.at(index.internalId());

    QTextFrame* parentFrame;
    if (nodeData.type == NodeData::Frame) {
        parentFrame = nodeData.frame->parentFrame();
    } else {
        QTextBlock block = m_textDocument->findBlockByNumber(nodeData.blockNumber);
        Q_ASSERT(block.isValid());
        // QTextBlock's API has no option to query the parentframe, so get it via a cursor
        QTextCursor cursor(block);
        parentFrame = cursor.currentFrame();
    }

    if (! parentFrame) {
        return QModelIndex();
    }

    QTextFrame* grandParentFrame = parentFrame->parentFrame();
    // parent is root frame?
    if (! grandParentFrame) {
        Q_ASSERT(parentFrame == m_textDocument->rootFrame());
        return createIndex(0, 0, static_cast<quintptr>(0));
    }

    // find position of parentFrame
    bool posFound = false;
    int row = 0;
    for (QTextFrame::iterator iterator = grandParentFrame->begin(); !iterator.atEnd(); ++iterator) {
        if (iterator.currentFrame() == parentFrame) {
            posFound = true;
            break;
        }
        ++row;
    }
    Q_ASSERT(posFound);Q_UNUSED(posFound);
    return createIndex(row, 0, frameIndex(parentFrame));
}

void XmlWriter::processTableCell(QDomElement &parent, const QTextTableCell &cell)
{
    QDomElement element = document->createElement("cell");
    element.setAttribute("row", cell.row());
    element.setAttribute("column", cell.column());
    
    QTextFrame::iterator it;
    for (it = cell.begin(); !(it.atEnd()); ++it) {

        QTextFrame *childFrame = it.currentFrame();
        QTextBlock childBlock = it.currentBlock();

        if (childFrame)
            processFrame(element, childFrame);
        else if (childBlock.isValid())
            processBlock(element, childBlock);
    }
    parent.appendChild(element);
}

QModelIndex TextDocumentStructureModel::index(int row, int column, const QModelIndex &parentIndex) const
{
    kDebug(32500) << "-------------------------- row:" << row << "column:"<<column << "index:"<<parentIndex<<m_textDocument;
    if (! m_textDocument) {
        return QModelIndex();
    }

    if (! parentIndex.isValid()) {
        return createIndex(row, column, static_cast<quintptr>(0));
    }

    Q_ASSERT(parentIndex.internalId() < uint(m_nodeDataTable.count()));

    const NodeData &nodeData = m_nodeDataTable.at(parentIndex.internalId());
    // can be only frame for now
    Q_ASSERT(nodeData.type == NodeData::Frame);

    QTextFrame* parentFrame = nodeData.frame;
    int index = -1;
    int count = 0;
    for (QTextFrame::iterator iterator = parentFrame->begin(); !iterator.atEnd(); ++iterator) {
        if (count == row) {
            QTextFrame *frame = iterator.currentFrame();
            if (frame) {
                index = frameIndex(frame);
                break;
            } else {
                QTextBlock block = iterator.currentBlock();
                if (block.isValid()) {
                    index = blockIndex(block);
                    break;
                }
            }
        }
        ++count;
    }

    Q_ASSERT(index != -1);
    return createIndex(row, column, index);
}

void MainWindow::showTable()
{
    QTextCursor cursor = editor->textCursor();
    QTextTable *table = cursor.currentTable();

    if (!table)
        return;

    QTableWidget *tableWidget = new QTableWidget(table->rows(), table->columns());

//! [9]
    for (int row = 0; row < table->rows(); ++row) {
        for (int column = 0; column < table->columns(); ++column) {
            QTextTableCell tableCell = table->cellAt(row, column);
//! [9]
            QTextFrame::iterator it;
            QString text;
            for (it = tableCell.begin(); !(it.atEnd()); ++it) {
                QTextBlock childBlock = it.currentBlock();
                if (childBlock.isValid())
                    text += childBlock.text();
            }
            QTableWidgetItem *newItem = new QTableWidgetItem(text);
            tableWidget->setItem(row, column, newItem);
            /*
//! [10]
            processTableCell(tableCell);
//! [10]
            */
//! [11]
        }
//! [11] //! [12]
    }
//! [12]

    tableWidget->setWindowTitle(tr("Table Contents"));
    tableWidget->show();
}

QString TextDocumentSerializer::processFrame(QTextFrame *frame)
{
    QString text;

    QTextFrame::iterator it = frame->begin();
    while(!it.atEnd()){
        QTextFrame *childFrame = it.currentFrame();
        QTextBlock childBlock = it.currentBlock();

        if(childFrame)
            text += processFrame(childFrame);
        else if(childBlock.isValid()){
            if(childBlock.textList())
                text = removeTrailingLineBreaks(text);
            text += processBlock(childBlock, it);
        }

        ++it;
    }

    text = removeTrailingLineBreaks(text);

    return text;
}

void MainWindow::showList()
{
    QTextCursor cursor = editor->textCursor();
    QTextFrame *frame = cursor.currentFrame();

    if (!frame)
        return;

    QTreeWidget *treeWidget = new QTreeWidget;
    treeWidget->setColumnCount(1);
    QStringList headerLabels;
    headerLabels << tr("Lists");
    treeWidget->setHeaderLabels(headerLabels);

    QTreeWidgetItem *parentItem = 0;
    QTreeWidgetItem *item;
    QTreeWidgetItem *lastItem = 0;
    parentItems.clear();
    previousItems.clear();

//! [3]
    QTextFrame::iterator it;
    for (it = frame->begin(); !(it.atEnd()); ++it) {

        QTextBlock block = it.currentBlock();

        if (block.isValid()) {

            QTextList *list = block.textList();

            if (list) {
                int index = list->itemNumber(block);
//! [3]
                if (index == 0) {
                    parentItems.append(parentItem);
                    previousItems.append(lastItem);
                    listStructures.append(list);
                    parentItem = lastItem;
                    lastItem = 0;

                    if (parentItem != 0)
                        item = new QTreeWidgetItem(parentItem, lastItem);
                    else
                        item = new QTreeWidgetItem(treeWidget, lastItem);

                } else {

                    while (parentItem != 0 && listStructures.last() != list) {
                        listStructures.pop_back();
                        parentItem = parentItems.takeLast();
                        lastItem = previousItems.takeLast();
                    }
                    if (parentItem != 0)
                        item = new QTreeWidgetItem(parentItem, lastItem);
                    else
                        item = new QTreeWidgetItem(treeWidget, lastItem);
                }
                item->setText(0, block.text());
                lastItem = item;
                /*
//! [4]
                processListItem(list, index);
//! [4]
                */
//! [5]
            }
//! [5] //! [6]
        }
//! [6] //! [7]
    }
//! [7]

    treeWidget->setWindowTitle(tr("List Contents"));
    treeWidget->show();
}

void QQuickTextNode::updateNodes()
{
    return;
    deleteContent();
    if (m_text.isEmpty())
        return;

    if (m_usePixmapCache) {
        // ### gunnar: port properly
//        QPixmap pixmap = generatedPixmap();
//        if (pixmap.isNull())
//            return;

//        QSGImageNode *pixmapNode = m_context->createImageNode();
//        pixmapNode->setRect(pixmap.rect());
//        pixmapNode->setSourceRect(pixmap.rect());
//        pixmapNode->setOpacity(m_opacity);
//        pixmapNode->setClampToEdge(true);
//        pixmapNode->setLinearFiltering(m_linearFiltering);

//        appendChildNode(pixmapNode);
    } else {
        if (m_text.isEmpty())
            return;

        // Implement styling by drawing text several times at slight shifts. shiftForStyle
        // contains the sequence of shifted positions at which to draw the text. All except
        // the last will be drawn with styleColor.
        QList<QPointF> shiftForStyle;
        switch (m_textStyle) {
        case OutlineTextStyle:
            // ### Should be made faster by implementing outline material
            shiftForStyle << QPointF(-1, 0);
            shiftForStyle << QPointF(0, -1);
            shiftForStyle << QPointF(1, 0);
            shiftForStyle << QPointF(0, 1);
            break;
        case SunkenTextStyle:
            shiftForStyle << QPointF(0, -1);
            break;
        case RaisedTextStyle:
            shiftForStyle << QPointF(0, 1);
            break;
        default:
            break;
        }

        shiftForStyle << QPointF(0, 0); // Regular position
        while (!shiftForStyle.isEmpty()) {
            QPointF shift = shiftForStyle.takeFirst();

            // Use styleColor for all but last shift
            if (m_richText) {
                QColor overrideColor = shiftForStyle.isEmpty() ? QColor() : m_styleColor;

                QTextFrame *textFrame = m_textDocument->rootFrame();
                QPointF p = m_textDocument->documentLayout()->frameBoundingRect(textFrame).topLeft();

                QTextFrame::iterator it = textFrame->begin();
                while (!it.atEnd()) {
                    addTextBlock(shift + p, it.currentBlock(), overrideColor);
                    ++it;
                }
            } else {
                addTextLayout(shift, m_textLayout, shiftForStyle.isEmpty()
                              ? m_color
                              : m_styleColor);
            }
        }
    }
}