qtextcontrol.cpp

奇趣公司比较新的qt/emd版本

            doc = new QTextDocument(q);
        }

        QObject::connect(doc->documentLayout(), SIGNAL(update(QRectF)), q, SIGNAL(updateRequest(QRectF)));
        QObject::connect(doc->documentLayout(), SIGNAL(documentSizeChanged(QSizeF)), q, SIGNAL(documentSizeChanged(QSizeF)));
        cursor = QTextCursor(doc);

// ####        doc->documentLayout()->setPaintDevice(viewport);

        QObject::connect(doc, SIGNAL(contentsChanged()), q, SLOT(_q_updateCurrentCharFormatAndSelection()));
        QObject::connect(doc, SIGNAL(cursorPositionChanged(QTextCursor)), q, SLOT(_q_emitCursorPosChanged(QTextCursor)));

        // convenience signal forwards
        QObject::connect(doc, SIGNAL(contentsChanged()), q, SIGNAL(textChanged()));
        QObject::connect(doc, SIGNAL(undoAvailable(bool)), q, SIGNAL(undoAvailable(bool)));
        QObject::connect(doc, SIGNAL(redoAvailable(bool)), q, SIGNAL(redoAvailable(bool)));
    }

    bool previousUndoRedoState = doc->isUndoRedoEnabled();
    doc->setUndoRedoEnabled(false);

    // avoid multiple textChanged() signals being emitted
    QObject::disconnect(doc, SIGNAL(contentsChanged()), q, SIGNAL(textChanged()));

    if (!text.isEmpty()) {
        // clear 'our' cursor for insertion to prevent
        // the emission of the cursorPositionChanged() signal.
        // instead we emit it only once at the end instead of
        // at the end of the document after loading and when
        // positioning the cursor again to the start of the
        // document.
        cursor = QTextCursor();
        if (format == Qt::PlainText) {
            QTextCursor formatCursor(doc);
            // put the setPlainText and the setCharFormat into one edit block,
            // so that the syntax highlight triggers only /once/ for the entire
            // document, not twice.
            formatCursor.beginEditBlock();
            doc->setPlainText(text);
            doc->setUndoRedoEnabled(false);
            formatCursor.select(QTextCursor::Document);
            formatCursor.setCharFormat(charFormatForInsertion);
            formatCursor.endEditBlock();
        } else {
            doc->setHtml(text);
            doc->setUndoRedoEnabled(false);
        }
        cursor = QTextCursor(doc);
    } else if (clearDocument) {
        doc->clear();
        cursor.movePosition(QTextCursor::Start);
        QTextBlockFormat blockFmt;
        blockFmt.setLayoutDirection(layoutDirection);
        cursor.mergeBlockFormat(blockFmt);
    }
    cursor.setCharFormat(charFormatForInsertion);

    QObject::connect(doc, SIGNAL(contentsChanged()), q, SIGNAL(textChanged()));
    emit q->textChanged();
    doc->setUndoRedoEnabled(previousUndoRedoState);
    _q_updateCurrentCharFormatAndSelection();
    doc->setModified(false);
    q->ensureCursorVisible();
    emit q->cursorPositionChanged();
}

void QTextControlPrivate::startDrag()
{
#ifndef QT_NO_DRAGANDDROP
    Q_Q(QTextControl);
    mousePressed = false;
    if (!contextWidget)
        return;
    QMimeData *data = q->createMimeDataFromSelection();

    QDrag *drag = new QDrag(contextWidget);
    drag->setMimeData(data);

    Qt::DropActions actions = Qt::CopyAction;
    if (interactionFlags & Qt::TextEditable)
        actions |= Qt::MoveAction;
    Qt::DropAction action = drag->exec(actions, Qt::MoveAction);

    if (action == Qt::MoveAction && drag->target() != contextWidget)
        cursor.removeSelectedText();
#endif
}

void QTextControlPrivate::setCursorPosition(const QPointF &pos)
{
    const int cursorPos = doc->documentLayout()->hitTest(pos, Qt::FuzzyHit);
    if (cursorPos == -1)
        return;
    cursor.setPosition(cursorPos);
}

void QTextControlPrivate::setCursorPosition(int pos, QTextCursor::MoveMode mode)
{
    cursor.setPosition(pos, mode);

    if (mode != QTextCursor::KeepAnchor) {
        selectedWordOnDoubleClick = QTextCursor();
        selectedLineOnDoubleClick = QTextCursor();
    }
}

void QTextControlPrivate::repaintCursor()
{
    Q_Q(QTextControl);
    emit q->updateRequest(q->cursorRect());
}

void QTextControlPrivate::repaintOldAndNewSelection(const QTextCursor &oldSelection)
{
    Q_Q(QTextControl);
    if (cursor.hasSelection()
        && oldSelection.hasSelection()
        && cursor.currentFrame() == oldSelection.currentFrame()
        && !cursor.hasComplexSelection()
        && !oldSelection.hasComplexSelection()
        && cursor.anchor() == oldSelection.anchor()
        && cursorIsFocusIndicator) {
        QTextCursor differenceSelection(doc);
        differenceSelection.setPosition(oldSelection.position());
        differenceSelection.setPosition(cursor.position(), QTextCursor::KeepAnchor);
        emit q->updateRequest(q->selectionRect(differenceSelection));
    } else {
        if (!oldSelection.isNull())
            emit q->updateRequest(q->selectionRect(oldSelection));
        emit q->updateRequest(q->selectionRect());
    }
}

void QTextControlPrivate::selectionChanged(bool forceEmitSelectionChanged /*=false*/)
{
    Q_Q(QTextControl);
    if (forceEmitSelectionChanged)
        emit q->selectionChanged();

    bool current = cursor.hasSelection();
    if (current == lastSelectionState)
        return;

    lastSelectionState = current;
    emit q->copyAvailable(current);
    if (!forceEmitSelectionChanged)
        emit q->selectionChanged();
    emit q->microFocusChanged();
}

void QTextControlPrivate::_q_updateCurrentCharFormatAndSelection()
{
    updateCurrentCharFormat();
    selectionChanged();
}

#ifndef QT_NO_CLIPBOARD
void QTextControlPrivate::setClipboardSelection()
{
    QClipboard *clipboard = QApplication::clipboard();
    if (!cursor.hasSelection() || !clipboard->supportsSelection())
        return;
    Q_Q(QTextControl);
    QMimeData *data = q->createMimeDataFromSelection();
    clipboard->setMimeData(data, QClipboard::Selection);
}
#endif

void QTextControlPrivate::_q_emitCursorPosChanged(const QTextCursor &someCursor)
{
    Q_Q(QTextControl);
    if (someCursor.isCopyOf(cursor)) {
        emit q->cursorPositionChanged();
        emit q->microFocusChanged();
    }
}

void QTextControlPrivate::setBlinkingCursorEnabled(bool enable)
{
    Q_Q(QTextControl);
    if (enable && QApplication::cursorFlashTime() > 0) {
        cursorBlinkTimer.start(QApplication::cursorFlashTime() / 2, q);
        cursorOn = true;
    } else {
        cursorBlinkTimer.stop();
        cursorOn = false;
    }
    repaintCursor();
}

void QTextControlPrivate::extendWordwiseSelection(int suggestedNewPosition, qreal mouseXPosition)
{
    Q_Q(QTextControl);

    // if inside the initial selected word keep that
    if (suggestedNewPosition >= selectedWordOnDoubleClick.selectionStart()
        && suggestedNewPosition <= selectedWordOnDoubleClick.selectionEnd()) {
        q->setTextCursor(selectedWordOnDoubleClick);
        return;
    }

    QTextCursor curs = selectedWordOnDoubleClick;
    curs.setPosition(suggestedNewPosition, QTextCursor::KeepAnchor);

    if (!curs.movePosition(QTextCursor::StartOfWord))
        return;
    const int wordStartPos = curs.position();

    const int blockPos = curs.block().position();
    const QPointF blockCoordinates = doc->documentLayout()->blockBoundingRect(curs.block()).topLeft();

    QTextLine line = currentTextLine(curs);
    if (!line.isValid())
        return;

    const qreal wordStartX = line.cursorToX(curs.position() - blockPos) + blockCoordinates.x();

    if (!curs.movePosition(QTextCursor::EndOfWord))
        return;
    const int wordEndPos = curs.position();

    const QTextLine otherLine = currentTextLine(curs);
    if (otherLine.textStart() != line.textStart()
        || wordEndPos == wordStartPos)
        return;

    const qreal wordEndX = line.cursorToX(curs.position() - blockPos) + blockCoordinates.x();

    if (mouseXPosition < wordStartX || mouseXPosition > wordEndX)
        return;

    // keep the already selected word even when moving to the left
    // (#39164)
    if (suggestedNewPosition < selectedWordOnDoubleClick.position())
        cursor.setPosition(selectedWordOnDoubleClick.selectionEnd());
    else
        cursor.setPosition(selectedWordOnDoubleClick.selectionStart());

    const qreal differenceToStart = mouseXPosition - wordStartX;
    const qreal differenceToEnd = wordEndX - mouseXPosition;

    if (differenceToStart < differenceToEnd)
        setCursorPosition(wordStartPos, QTextCursor::KeepAnchor);
    else
        setCursorPosition(wordEndPos, QTextCursor::KeepAnchor);

    if (interactionFlags & Qt::TextSelectableByMouse) {
#ifndef QT_NO_CLIPBOARD
        setClipboardSelection();
#endif
        selectionChanged(true);
    }
}

void QTextControlPrivate::extendLinewiseSelection(int suggestedNewPosition)
{
    Q_Q(QTextControl);

    // if inside the initial selected line keep that
    if (suggestedNewPosition >= selectedLineOnDoubleClick.selectionStart()
        && suggestedNewPosition <= selectedLineOnDoubleClick.selectionEnd()) {
        q->setTextCursor(selectedLineOnDoubleClick);
        return;
    }

    if (suggestedNewPosition < selectedLineOnDoubleClick.position()) {
        cursor.setPosition(selectedLineOnDoubleClick.selectionEnd());
        cursor.setPosition(suggestedNewPosition, QTextCursor::KeepAnchor);
        cursor.movePosition(QTextCursor::StartOfLine, QTextCursor::KeepAnchor);
    } else {
        cursor.setPosition(selectedLineOnDoubleClick.selectionStart());
        cursor.setPosition(suggestedNewPosition, QTextCursor::KeepAnchor);
        cursor.movePosition(QTextCursor::EndOfLine, QTextCursor::KeepAnchor);
    }

    if (interactionFlags & Qt::TextSelectableByMouse) {
#ifndef QT_NO_CLIPBOARD
        setClipboardSelection();
#endif
        selectionChanged(true);
    }
}

void QTextControlPrivate::_q_deleteSelected()
{
    if (!(interactionFlags & Qt::TextEditable) || !cursor.hasSelection())
	return;
    cursor.removeSelectedText();
}

void QTextControl::undo()
{
    Q_D(QTextControl);
    d->doc->undo(&d->cursor);
    ensureCursorVisible();
}

void QTextControl::redo()
{
    Q_D(QTextControl);
    d->doc->redo(&d->cursor);
    ensureCursorVisible();
}

QTextControl::QTextControl(QObject *parent)
    : QObject(*new QTextControlPrivate, parent)
{
    Q_D(QTextControl);
    d->init();
}

QTextControl::QTextControl(const QString &text, QObject *parent)
    : QObject(*new QTextControlPrivate, parent)
{
    Q_D(QTextControl);
    d->init(Qt::RichText, text);
}

QTextControl::QTextControl(QTextDocument *doc, QObject *parent)
    : QObject(*new QTextControlPrivate, parent)
{
    Q_D(QTextControl);
    d->init(Qt::RichText, QString(), doc);
}

QTextControl::~QTextControl()
{
}

void QTextControl::setDocument(QTextDocument *document)
{
    Q_D(QTextControl);
    if (d->doc == document)
        return;

    d->doc->disconnect(this);
    d->doc->documentLayout()->disconnect(this);
    d->doc->documentLayout()->setPaintDevice(0);

    if (d->doc->parent() == this)
        delete d->doc;

    d->doc = 0;
    d->setContent(Qt::RichText, QString(), document);
}

QTextDocument *QTextControl::document() const
{
    Q_D(const QTextControl);
    return d->doc;
}

void QTextControl::setTextCursor(const QTextCursor &cursor)
{
    Q_D(QTextControl);
    const bool posChanged = cursor.position() != d->cursor.position();
    const QTextCursor oldSelection = d->cursor;
    d->cursor = cursor;
    d->_q_updateCurrentCharFormatAndSelection();
    ensureCursorVisible();
    d->repaintOldAndNewSelection(oldSelection);
    if (posChanged)
        emit cursorPositionChanged();
}

QTextCursor QTextControl::textCursor() const
{
    Q_D(const QTextControl);
    return d->cursor;
}

#ifndef QT_NO_CLIPBOARD

void QTextControl::cut()
{
    Q_D(QTextControl);
    if (!(d->interactionFlags & Qt::TextEditable) || !d->cursor.hasSelection())
	return;
    copy();
    d->cursor.removeSelectedText();
}

void QTextControl::copy()
{
    Q_D(QTextControl);
    if (!d->cursor.hasSelection())
	return;
    QMimeData *data = createMimeDataFromSelection();
    QApplication::clipboard()->setMimeData(data);
}

void QTextControl::paste()
{
    const QMimeData *md = QApplication::clipboard()->mimeData();
    if (md)
        insertFromMimeData(md);
}
#endif

void QTextControl::clear()
{
    Q_D(QTextControl);
    // clears and sets empty content
    d->setContent();
}