qtextcontrol.cpp

奇趣公司比较新的qt/emd版本

        return textEdit->loadResource(type, name);
#endif
    return QVariant();
}

QRectF QTextControlPrivate::rectForPosition(int position) const
{
    const QTextBlock block = doc->findBlock(position);
    if (!block.isValid())
        return QRectF();
    const QAbstractTextDocumentLayout *docLayout = doc->documentLayout();
    const QTextLayout *layout = block.layout();
    const QPointF layoutPos = docLayout->blockBoundingRect(block).topLeft();
    int relativePos = position - block.position();
    if (preeditCursor != 0) {
        int preeditPos = layout->preeditAreaPosition();
        if (relativePos == preeditPos)
            relativePos += preeditCursor;
        else if (relativePos > preeditPos)
            relativePos += layout->preeditAreaText().length();
    }
    QTextLine line = layout->lineForTextPosition(relativePos);

    int cursorWidth;
    {
        bool ok = false;
#ifndef QT_NO_PROPERTIES
        cursorWidth = docLayout->property("cursorWidth").toInt(&ok);
#endif
        if (!ok)
            cursorWidth = 1;
    }

    QRectF r;

    if (line.isValid())
        r = QRectF(layoutPos.x() + line.cursorToX(relativePos) - 5 - cursorWidth, layoutPos.y() + line.y(),
                  2 * cursorWidth + 10, line.ascent() + line.descent()+1.);
    else
        r = QRectF(layoutPos.x() - 5 - cursorWidth, layoutPos.y(), 2 * cursorWidth + 10, 10); // #### correct height

    return r;
}

static inline bool firstFramePosLessThanCursorPos(QTextFrame *frame, int position)
{
    return frame->firstPosition() < position;
}

static inline bool cursorPosLessThanLastFramePos(int position, QTextFrame *frame)
{
    return position < frame->lastPosition();
}

static QRectF boundingRectOfFloatsInSelection(const QTextCursor &cursor)
{
    QRectF r;
    QTextFrame *frame = cursor.currentFrame();
    const QList<QTextFrame *> children = frame->childFrames();

    const QList<QTextFrame *>::ConstIterator firstFrame = qLowerBound(children.constBegin(), children.constEnd(),
                                                                      cursor.selectionStart(), firstFramePosLessThanCursorPos);
    const QList<QTextFrame *>::ConstIterator lastFrame = qUpperBound(children.constBegin(), children.constEnd(),
                                                                     cursor.selectionEnd(), cursorPosLessThanLastFramePos);
    for (QList<QTextFrame *>::ConstIterator it = firstFrame; it != lastFrame; ++it) {
        if ((*it)->frameFormat().position() != QTextFrameFormat::InFlow)
            r |= frame->document()->documentLayout()->frameBoundingRect(*it);
    }
    return r;
}

QRectF QTextControl::selectionRect(const QTextCursor &cursor) const
{
    Q_D(const QTextControl);

    QRectF r = d->rectForPosition(cursor.selectionStart());

    if (cursor.hasComplexSelection() && cursor.currentTable()) {
        QTextTable *table = cursor.currentTable();

        r = d->doc->documentLayout()->frameBoundingRect(table);
        /*
        int firstRow, numRows, firstColumn, numColumns;
        cursor.selectedTableCells(&firstRow, &numRows, &firstColumn, &numColumns);

        const QTextTableCell firstCell = table->cellAt(firstRow, firstColumn);
        const QTextTableCell lastCell = table->cellAt(firstRow + numRows - 1, firstColumn + numColumns - 1);

        const QAbstractTextDocumentLayout * const layout = doc->documentLayout();

        QRectF tableSelRect = layout->blockBoundingRect(firstCell.firstCursorPosition().block());

        for (int col = firstColumn; col < firstColumn + numColumns; ++col) {
            const QTextTableCell cell = table->cellAt(firstRow, col);
            const qreal y = layout->blockBoundingRect(cell.firstCursorPosition().block()).top();

            tableSelRect.setTop(qMin(tableSelRect.top(), y));
        }

        for (int row = firstRow; row < firstRow + numRows; ++row) {
            const QTextTableCell cell = table->cellAt(row, firstColumn);
            const qreal x = layout->blockBoundingRect(cell.firstCursorPosition().block()).left();

            tableSelRect.setLeft(qMin(tableSelRect.left(), x));
        }

        for (int col = firstColumn; col < firstColumn + numColumns; ++col) {
            const QTextTableCell cell = table->cellAt(firstRow + numRows - 1, col);
            const qreal y = layout->blockBoundingRect(cell.lastCursorPosition().block()).bottom();

            tableSelRect.setBottom(qMax(tableSelRect.bottom(), y));
        }

        for (int row = firstRow; row < firstRow + numRows; ++row) {
            const QTextTableCell cell = table->cellAt(row, firstColumn + numColumns - 1);
            const qreal x = layout->blockBoundingRect(cell.lastCursorPosition().block()).right();

            tableSelRect.setRight(qMax(tableSelRect.right(), x));
        }

        r = tableSelRect.toRect();
        */
    } else if (cursor.hasSelection()) {
        const int position = cursor.selectionStart();
        const int anchor = cursor.selectionEnd();
        const QTextBlock posBlock = d->doc->findBlock(position);
        const QTextBlock anchorBlock = d->doc->findBlock(anchor);
        if (posBlock == anchorBlock && posBlock.isValid() && posBlock.layout()->lineCount()) {
            const QTextLine posLine = posBlock.layout()->lineForTextPosition(position - posBlock.position());
            const QTextLine anchorLine = anchorBlock.layout()->lineForTextPosition(anchor - anchorBlock.position());

            const int firstLine = qMin(posLine.lineNumber(), anchorLine.lineNumber());
            const int lastLine = qMax(posLine.lineNumber(), anchorLine.lineNumber());
            const QTextLayout *layout = posBlock.layout();
            r = QRectF();
            for (int i = firstLine; i <= lastLine; ++i) {
                r |= layout->lineAt(i).rect();
            }
            r.translate(d->doc->documentLayout()->blockBoundingRect(posBlock).topLeft());
        } else {
            QRectF anchorRect = d->rectForPosition(cursor.selectionEnd());
            r |= anchorRect;
            r |= boundingRectOfFloatsInSelection(cursor);
            QRectF frameRect(d->doc->documentLayout()->frameBoundingRect(cursor.currentFrame()));
            r.setLeft(frameRect.left());
            r.setRight(frameRect.right());
        }
        if (r.isValid())
            r.adjust(-1, -1, 1, 1);
    }

    return r;
}

QRectF QTextControl::selectionRect() const
{
    Q_D(const QTextControl);
    return selectionRect(d->cursor);
}

void QTextControlPrivate::mousePressEvent(Qt::MouseButton button, const QPointF &pos, Qt::KeyboardModifiers modifiers,
                                          Qt::MouseButtons buttons, const QPoint &globalPos)
{
    Q_Q(QTextControl);

    if (interactionFlags & Qt::LinksAccessibleByMouse) {
        anchorOnMousePress = q->anchorAt(pos);

        if (cursorIsFocusIndicator) {
            cursorIsFocusIndicator = false;
            repaintSelection();
            cursor.clearSelection();
        }
    }
    if (!(button & Qt::LeftButton))
        return;

    if (!((interactionFlags & Qt::TextSelectableByMouse) || (interactionFlags & Qt::TextEditable)))
        return;

    cursorIsFocusIndicator = false;
    const QTextCursor oldSelection = cursor;
    const int oldCursorPos = cursor.position();

    mousePressed = true;
#ifndef QT_NO_DRAGANDDROP
    mightStartDrag = false;
#endif

    if (trippleClickTimer.isActive()
        && ((pos - trippleClickPoint).toPoint().manhattanLength() < QApplication::startDragDistance())) {

        cursor.movePosition(QTextCursor::StartOfBlock);
        cursor.movePosition(QTextCursor::EndOfBlock, QTextCursor::KeepAnchor);

        anchorOnMousePress = QString();

        trippleClickTimer.stop();
    } else {
        int cursorPos = doc->documentLayout()->hitTest(pos, Qt::FuzzyHit);
        if (cursorPos == -1)
            return;

#if !defined(QT_NO_IM)
        QTextLayout *layout = cursor.block().layout();
        if (contextWidget && layout && !layout->preeditAreaText().isEmpty()) {
            QInputContext *ctx = contextWidget->inputContext();
            if (!ctx && contextWidget->parentWidget())
                ctx = contextWidget->parentWidget()->inputContext();
            if (ctx) {
                QMouseEvent ev(QEvent::MouseButtonPress, contextWidget->mapFromGlobal(globalPos), globalPos,
                               button, buttons, modifiers);
                ctx->mouseHandler(cursorPos - cursor.position(), &ev);
            }
            if (!layout->preeditAreaText().isEmpty())
                return;
        }
#endif
        if (modifiers == Qt::ShiftModifier) {
            if (selectedWordOnDoubleClick.hasSelection())
                extendWordwiseSelection(cursorPos, pos.x());
            else if (selectedLineOnDoubleClick.hasSelection())
                extendLinewiseSelection(cursorPos);
            else
                setCursorPosition(cursorPos, QTextCursor::KeepAnchor);
        } else {

            if (cursor.hasSelection()
                && !cursorIsFocusIndicator
                && cursorPos >= cursor.selectionStart()
                && cursorPos <= cursor.selectionEnd()
                && doc->documentLayout()->hitTest(pos, Qt::ExactHit) != -1) {
#ifndef QT_NO_DRAGANDDROP
                mightStartDrag = true;
                dragStartPos = pos.toPoint();
#endif
                return;
            }

            setCursorPosition(cursorPos);
        }
    }

    if (interactionFlags & Qt::TextEditable) {
        q->ensureCursorVisible();
        if (cursor.position() != oldCursorPos)
            emit q->cursorPositionChanged();
        _q_updateCurrentCharFormatAndSelection();
    } else {
        if (cursor.position() != oldCursorPos)
            emit q->cursorPositionChanged();
        selectionChanged();
    }
    repaintOldAndNewSelection(oldSelection);
    hadSelectionOnMousePress = cursor.hasSelection();
}

void QTextControlPrivate::mouseMoveEvent(Qt::MouseButtons buttons, const QPointF &mousePos)
{
    Q_Q(QTextControl);

    if (interactionFlags & Qt::LinksAccessibleByMouse) {
        QString anchor = q->anchorAt(mousePos);
        if (anchor != highlightedAnchor) {
            highlightedAnchor = anchor;
            emit q->linkHovered(anchor);
        }
    }

    if (!(buttons & Qt::LeftButton))
        return;

    if (!((interactionFlags & Qt::TextSelectableByMouse) || (interactionFlags & Qt::TextEditable)))
        return;

    if (!(mousePressed
          || selectedWordOnDoubleClick.hasSelection()
          || selectedLineOnDoubleClick.hasSelection()))
        return;

    const QTextCursor oldSelection = cursor;
    const int oldCursorPos = cursor.position();

    if (mightStartDrag) {
        if ((mousePos.toPoint() - dragStartPos).manhattanLength() > QApplication::startDragDistance())
            startDrag();
        return;
    }
    const qreal mouseX = qreal(mousePos.x());

#if !defined(QT_NO_IM)
    QTextLayout *layout = cursor.block().layout();
    if (layout && !layout->preeditAreaText().isEmpty())
        return;
#endif

    int newCursorPos = doc->documentLayout()->hitTest(mousePos, Qt::FuzzyHit);
    if (newCursorPos == -1)
        return;

    if (selectedWordOnDoubleClick.hasSelection())
        extendWordwiseSelection(newCursorPos, mouseX);
    else if (selectedLineOnDoubleClick.hasSelection())
        extendLinewiseSelection(newCursorPos);
    else
        setCursorPosition(newCursorPos, QTextCursor::KeepAnchor);

    if (interactionFlags & Qt::TextEditable) {
        q->ensureCursorVisible();
        if (cursor.position() != oldCursorPos)
            emit q->cursorPositionChanged();
        _q_updateCurrentCharFormatAndSelection();
    } else {
        emit q->visibilityRequest(QRectF(mousePos, QSizeF(1, 1)));
        if (cursor.position() != oldCursorPos)
            emit q->cursorPositionChanged();
        selectionChanged();
    }
    repaintOldAndNewSelection(oldSelection);
}

void QTextControlPrivate::mouseReleaseEvent(Qt::MouseButton button, const QPointF &pos)
{
    Q_Q(QTextControl);

    const QTextCursor oldSelection = cursor;
    const int oldCursorPos = cursor.position();

#ifndef QT_NO_DRAGANDDROP
    if (mightStartDrag && (button & Qt::LeftButton)) {
        mousePressed = false;
        setCursorPosition(pos);
        cursor.clearSelection();
        selectionChanged();
    }
#endif
    if (mousePressed) {
        mousePressed = false;
#ifndef QT_NO_CLIPBOARD
        if (interactionFlags & Qt::TextSelectableByMouse) {
            setClipboardSelection();
            selectionChanged(true);
        }
    } else if (button == Qt::MidButton
               && (interactionFlags & Qt::TextEditable)
               && QApplication::clipboard()->supportsSelection()) {
        setCursorPosition(pos);
        const QMimeData *md = QApplication::clipboard()->mimeData(QClipboard::Selection);
        if (md)
            q->insertFromMimeData(md);
#endif
    }

    repaintOldAndNewSelection(oldSelection);

    if (cursor.position() != oldCursorPos)
        emit q->cursorPositionChanged();

    if (interactionFlags & Qt::LinksAccessibleByMouse) {
        if (!(button & Qt::LeftButton))
            return;

        const QString anchor = q->anchorAt(pos);

        if (anchor.isEmpty())
            return;

        if (!cursor.hasSelection()
            || (anchor == anchorOnMousePress && hadSelectionOnMousePress)) {

            const int anchorPos = doc->documentLayout()->hitTest(pos, Qt::ExactHit);
            if (anchorPos != -1) {
                cursor.setPosition(anchorPos);

                QString anchor = anchorOnMousePress;
                anchorOnMousePress = QString();
                activateLinkUnderCursor(anchor);
            }
        }
    }
}

void QTextControlPrivate::mouseDoubleClickEvent(QEvent *e, Qt::MouseButton button, const QPointF &pos)
{
    Q_Q(QTextControl);
    if (button != Qt::LeftButton
        || !(interactionFlags & Qt::TextSelectableByMouse)) {
        e->ignore();
        return;
    }
#if !defined(QT_NO_IM)
    QTextLayout *layout = cursor.block().layout();
    if (layout && !layout->preeditAreaText().isEmpty())
        return;
#endif

#ifndef QT_NO_DRAGANDDROP
    mightStartDrag = false;
#endif
    const QTextCursor oldSelection = cursor;
    setCursorPosition(pos);
    QTextLine line = currentTextLine(cursor);
    if (line.isValid() && line.textLength()) {
        cursor.select(QTextCursor::WordUnderCursor);
        selectionChanged();
#ifndef QT_NO_CLIPBOARD