qtextdocumentlayout.cpp

奇趣公司比较新的qt/emd版本

    *position = cell.firstPosition();

    HitPoint hp = hitTest(cell.begin(), PointInside, point - td->cellPosition(cell), position, l, accuracy);

    if (hp == PointExact)
        return hp;
    if (hp == PointAfter)
        *position = cell.lastPosition();
    return PointInside;
}

QTextDocumentLayoutPrivate::HitPoint
QTextDocumentLayoutPrivate::hitTest(QTextBlock bl, const QFixedPoint &point, int *position, QTextLayout **l,
                                    Qt::HitTestAccuracy accuracy) const
{
    QTextLayout *tl = bl.layout();
    QRectF textrect = tl->boundingRect();
    textrect.translate(tl->position());
//     LDEBUG << "    checking block" << bl.position() << "point=" << point
//            << "    tlrect" << textrect;
    *position = bl.position();
    if (point.y.toReal() < textrect.top()) {
//             LDEBUG << "    before pos=" << *position;
        return PointBefore;
    } else if (point.y.toReal() > textrect.bottom()) {
        *position += bl.length();
//             LDEBUG << "    after pos=" << *position;
        return PointAfter;
    }

    QPointF pos = point.toPointF() - tl->position();

    // ### rtl?

    HitPoint hit = PointInside;
    *l = tl;
    int off = 0;
    for (int i = 0; i < tl->lineCount(); ++i) {
        QTextLine line = tl->lineAt(i);
        const QRectF lr = line.naturalTextRect();
        if (lr.top() > pos.y()) {
            off = qMin(off, line.textStart());
        } else if (lr.bottom() <= pos.y()) {
            off = qMax(off, line.textStart() + line.textLength());
        } else {
            if (lr.left() <= pos.x() && lr.right() >= pos.x())
                hit = PointExact;
            // when trying to hit an anchor we want it to hit not only in the left
            // half
            if (accuracy == Qt::ExactHit)
                off = line.xToCursor(pos.x(), QTextLine::CursorOnCharacter);
            else
                off = line.xToCursor(pos.x(), QTextLine::CursorBetweenCharacters);
            break;
        }
    }
    *position += off;

//     LDEBUG << "    inside=" << hit << " pos=" << *position;
    return hit;
}

// ### could be moved to QTextBlock
qreal QTextDocumentLayoutPrivate::indent(QTextBlock bl) const
{
    Q_Q(const QTextDocumentLayout);
    QTextBlockFormat blockFormat = bl.blockFormat();
    qreal indent = blockFormat.indent();

    QTextObject *object = q->document()->objectForFormat(blockFormat);
    if (object)
        indent += object->format().toListFormat().indent();

    qreal scale = 1;
    if (q->paintDevice()) {
        extern int qt_defaultDpi();
        scale = qreal(q->paintDevice()->logicalDpiY()) / qreal(qt_defaultDpi());
    }

    return indent * TextIndentValue * scale;
}

void QTextDocumentLayoutPrivate::drawBorder(QPainter *painter, const QRectF &rect, qreal topMargin, qreal bottomMargin,
                                            qreal border, const QBrush &brush, QTextFrameFormat::BorderStyle style) const
{
    Q_Q(const QTextDocumentLayout);

    const qreal pageHeight = q->document()->pageSize().height();
    const int topPage = pageHeight > 0 ? static_cast<int>(rect.top() / pageHeight) : 0;
    const int bottomPage = pageHeight > 0 ? static_cast<int>((rect.bottom() + border) / pageHeight) : 0;

    QCss::BorderStyle cssStyle = static_cast<QCss::BorderStyle>(style + 1);

    for (int i = topPage; i <= bottomPage; ++i) {
        QRectF clipped = rect;

        if (topPage != bottomPage) {
            clipped.setTop(qMax(clipped.top(), i * pageHeight + topMargin - border));
            clipped.setBottom(qMin(clipped.bottom(), (i + 1) * pageHeight - bottomMargin));

            if (clipped.bottom() <= clipped.top())
                continue;
        }

        qDrawEdge(painter, clipped.left(), clipped.top(), clipped.left() + border, clipped.bottom() + border, 0, 0, QCss::LeftEdge, cssStyle, brush);
        qDrawEdge(painter, clipped.left() + border, clipped.top(), clipped.right() + border, clipped.top() + border, 0, 0, QCss::TopEdge, cssStyle, brush);
        qDrawEdge(painter, clipped.right(), clipped.top() + border, clipped.right() + border, clipped.bottom(), 0, 0, QCss::RightEdge, cssStyle, brush);
        qDrawEdge(painter, clipped.left() + border, clipped.bottom(), clipped.right() + border, clipped.bottom() + border, 0, 0, QCss::BottomEdge, cssStyle, brush);
    }
}

void QTextDocumentLayoutPrivate::drawFrameDecoration(QPainter *painter, QTextFrame *frame, QTextFrameData *fd, const QRectF &clip, const QRectF &rect) const
{
    if (fd->border != 0) {
        painter->save();
        painter->setBrush(Qt::lightGray);
        painter->setPen(Qt::NoPen);

        const qreal leftEdge = rect.left() + fd->leftMargin.toReal();
        const qreal border = fd->border.toReal();
        const qreal topMargin = fd->topMargin.toReal();
        const qreal leftMargin = fd->leftMargin.toReal();
        const qreal bottomMargin = fd->bottomMargin.toReal();
        const qreal rightMargin = fd->rightMargin.toReal();
        const qreal w = rect.width() - 2 * border - leftMargin - rightMargin;
        const qreal h = rect.height() - 2 * border - topMargin - bottomMargin;

        drawBorder(painter, QRectF(leftEdge, rect.top() + topMargin, w + border, h + border),
                   fd->effectiveTopMargin.toReal(), fd->effectiveBottomMargin.toReal(),
                   border, frame->frameFormat().borderBrush(), frame->frameFormat().borderStyle());

        painter->restore();
    }

    const QBrush bg = frame->frameFormat().background();
    if (bg != Qt::NoBrush) {
        QRectF bgRect = rect;
        bgRect.adjust((fd->leftMargin + fd->border).toReal(),
                      (fd->topMargin + fd->border).toReal(),
                      - (fd->rightMargin + fd->border).toReal(),
                      - (fd->bottomMargin + fd->border).toReal());

        QRectF gradientRect; // invalid makes it default to bgRect
        if (!frame->parentFrame()) {
            bgRect = clip;
            gradientRect.setWidth(painter->device()->width());
            gradientRect.setHeight(painter->device()->height());
        }
        fillBackground(painter, bgRect, bg, gradientRect);
    }
}

static void adjustContextSelectionsForCell(QAbstractTextDocumentLayout::PaintContext &cell_context,
                                           const QTextTableCell &cell,
                                           int r, int c,
                                           const int *selectedTableCells)
{
    for (int i = 0; i < cell_context.selections.size(); ++i) {
        int row_start = selectedTableCells[i * 4];
        int col_start = selectedTableCells[i * 4 + 1];
        int num_rows = selectedTableCells[i * 4 + 2];
        int num_cols = selectedTableCells[i * 4 + 3];

        if (row_start != -1) {
            if (r >= row_start && r < row_start + num_rows
                && c >= col_start && c < col_start + num_cols)
            {
                int firstPosition = cell.firstPosition();
                int lastPosition = cell.lastPosition();

                // make sure empty cells are still selected
                if (firstPosition == lastPosition)
                    ++lastPosition;

                cell_context.selections[i].cursor.setPosition(firstPosition);
                cell_context.selections[i].cursor.setPosition(lastPosition, QTextCursor::KeepAnchor);
            } else {
                cell_context.selections[i].cursor.clearSelection();
            }
        }
    }
}

void QTextDocumentLayoutPrivate::drawFrame(const QPointF &offset, QPainter *painter,
                                           const QAbstractTextDocumentLayout::PaintContext &context,
                                           QTextFrame *frame) const
{
    Q_Q(const QTextDocumentLayout);
    QTextFrameData *fd = data(frame);
    // #######
    if (fd->layoutDirty)
        return;
    Q_ASSERT(!fd->sizeDirty);
    Q_ASSERT(!fd->layoutDirty);

    const QPointF off = offset + fd->position.toPointF();
    if (context.clip.isValid()
        && (off.y() > context.clip.bottom() || off.y() + fd->size.height.toReal() < context.clip.top()
            || off.x() > context.clip.right() || off.x() + fd->size.width.toReal() < context.clip.left()))
        return;

//     LDEBUG << debug_indent << "drawFrame" << frame->firstPosition() << "--" << frame->lastPosition() << "at" << offset;
//     INC_INDENT;

    // if the cursor is /on/ a table border we may need to repaint it
    // afterwards, as we usually draw the decoration first
    QTextBlock cursorBlockNeedingRepaint;
    QPointF offsetOfRepaintedCursorBlock = off;

    QTextTable *table = qobject_cast<QTextTable *>(frame);
    const QRectF frameRect(off, fd->size.toSizeF());

    if (table) {
        const int rows = table->rows();
        const int columns = table->columns();
        QTextTableData *td = static_cast<QTextTableData *>(data(table));

        QVarLengthArray<int> selectedTableCells(context.selections.size() * 4);
        for (int i = 0; i < context.selections.size(); ++i) {
            const QAbstractTextDocumentLayout::Selection &s = context.selections.at(i);
            int row_start = -1, col_start = -1, num_rows = -1, num_cols = -1;

            if (s.cursor.currentTable() == table)
                s.cursor.selectedTableCells(&row_start, &num_rows, &col_start, &num_cols);

            selectedTableCells[i * 4] = row_start;
            selectedTableCells[i * 4 + 1] = col_start;
            selectedTableCells[i * 4 + 2] = num_rows;
            selectedTableCells[i * 4 + 3] = num_cols;
        }

        QFixed pageHeight = QFixed::fromReal(q->document()->pageSize().height());
        if (pageHeight <= 0)
            pageHeight = QFIXED_MAX;

        const int tableStartPage = (td->position.y / pageHeight).truncate();
        const int tableEndPage = ((td->position.y + td->size.height) / pageHeight).truncate();

        qreal border = td->border.toReal();
        drawFrameDecoration(painter, frame, fd, context.clip, frameRect);

        // draw the table headers
        const int headerRowCount = qMin(table->format().headerRowCount(), rows - 1);
        int page = tableStartPage + 1;
        while (page <= tableEndPage) {
            const QFixed pageTop = page * pageHeight + td->effectiveTopMargin + td->cellSpacing + td->border;
            const qreal headerOffset = (pageTop - td->rowPositions.at(0)).toReal();
            for (int r = 0; r < headerRowCount; ++r) {
                for (int c = 0; c < columns; ++c) {
                    QTextTableCell cell = table->cellAt(r, c);
                    QAbstractTextDocumentLayout::PaintContext cell_context = context;
                    adjustContextSelectionsForCell(cell_context, cell, r, c, selectedTableCells.data());
                    QRectF cellRect = td->cellRect(cell);

                    cellRect.translate(off.x(), headerOffset);
                    // we need to account for the cell border in the clipping test
                    if (cell_context.clip.isValid() && !cellRect.adjusted(1 - border, 1 - border, border, border).intersects(cell_context.clip))
                        continue;

                    drawTableCell(cellRect, painter, cell_context, table, td, r, c, &cursorBlockNeedingRepaint,
                                  &offsetOfRepaintedCursorBlock);
                }
            }
            ++page;
        }

        int firstRow = 0;
        int lastRow = rows;

        if (context.clip.isValid()) {
            QVector<QFixed>::ConstIterator rowIt = qLowerBound(td->rowPositions.constBegin(), td->rowPositions.constEnd(), QFixed::fromReal(context.clip.top() - off.y()));
            if (rowIt != td->rowPositions.constEnd() && rowIt != td->rowPositions.constBegin()) {
                --rowIt;
                firstRow = rowIt - td->rowPositions.constBegin();
            }

            rowIt = qUpperBound(td->rowPositions.constBegin(), td->rowPositions.constEnd(), QFixed::fromReal(context.clip.bottom() - off.y()));
            if (rowIt != td->rowPositions.constEnd()) {
                ++rowIt;
                lastRow = rowIt - td->rowPositions.constBegin();
            }
        }

        for (int c = 0; c < columns; ++c) {
            QTextTableCell cell = table->cellAt(firstRow, c);
            firstRow = qMin(firstRow, cell.row());
        }

        for (int r = firstRow; r < lastRow; ++r) {
            for (int c = 0; c < columns; ++c) {
                QTextTableCell cell = table->cellAt(r, c);
                QAbstractTextDocumentLayout::PaintContext cell_context = context;
                adjustContextSelectionsForCell(cell_context, cell, r, c, selectedTableCells.data());
                QRectF cellRect = td->cellRect(cell);

                cellRect.translate(off);
                // we need to account for the cell border in the clipping test
                if (cell_context.clip.isValid() && !cellRect.adjusted(1 - border, 1 - border, border, border).intersects(cell_context.clip))
                    continue;

                drawTableCell(cellRect, painter, cell_context, table, td, r, c, &cursorBlockNeedingRepaint,
                              &offsetOfRepaintedCursorBlock);
            }
        }

    } else {
        drawFrameDecoration(painter, frame, fd, context.clip, frameRect);

        QTextFrame::Iterator it = frame->begin();

        if (frame == q->document()->rootFrame())
            it = frameIteratorForYPosition(QFixed::fromReal(context.clip.top()));

        QList<QTextFrame *> floats;
        for (int i = 0; i < fd->floats.count(); ++i)
            floats.append(fd->floats.at(i));

        drawFlow(off, painter, context, it, floats, &cursorBlockNeedingRepaint);
    }

    if (cursorBlockNeedingRepaint.isValid()) {
        const QPen oldPen = painter->pen();
        painter->setPen(context.palette.color(QPalette::Text));
        const int cursorPos = context.cursorPosition - cursorBlockNeedingRepaint.position();
        cursorBlockNeedingRepaint.layout()->drawCursor(painter, offsetOfRepaintedCursorBlock,
                                                       cursorPos, cursorWidth);
        painter->setPen(oldPen);
    }

//     DEC_INDENT;

    return;
}

void QTextDocumentLayoutPrivate::drawTableCell(const QRectF &cellRect, QPainter *painter, const QAbstractTextDocumentLayout::PaintContext &cell_context,
                                               QTextTable *table, QTextTableData *td, int r, int c,
                                               QTextBlock *cursorBlockNeedingRepaint, QPointF *cursorBlockOffset) const
{
    QTextTableCell cell = table->cellAt(r, c);