C++ QtGradientStop::position方法代码示例

void QtGradientStopsWidgetPrivate::setupMove(QtGradientStop *stop, int x)
{
    m_model->setCurrentStop(stop);

    int viewportX = qRound(toViewport(stop->position()));
    m_moveOffset = x - viewportX;

    QList<QtGradientStop *> stops = m_stops;
    m_stops.clear();
    QListIterator<QtGradientStop *> itStop(stops);
    while (itStop.hasNext()) {
        QtGradientStop *s = itStop.next();
        if (m_model->isSelected(s) || s == stop) {
            m_moveStops[s] = s->position() - stop->position();
            m_stops.append(s);
        } else {
            m_moveOriginal[s->position()] = s->color();
        }
    }
    itStop.toFront();
    while (itStop.hasNext()) {
        QtGradientStop *s = itStop.next();
        if (!m_model->isSelected(s))
            m_stops.append(s);
    }
    m_stops.removeAll(stop);
    m_stops.prepend(stop);
}

void QtGradientStopsControllerPrivate::slotUpdatePositionSpinBox()
{
    QtGradientStop *current = m_model->currentStop();
    if (!current)
        return;

    qreal min = 0.0;
    qreal max = 1.0;
    const qreal pos = current->position();

    QtGradientStop *first = m_model->firstSelected();
    QtGradientStop *last = m_model->lastSelected();

    if (first && last) {
        const qreal minPos = pos - first->position() - 0.0004999;
        const qreal maxPos = pos + 1.0 - last->position() + 0.0004999;

        if (max > maxPos)
            max = maxPos;
        if (min < minPos)
            min = minPos;

        if (first->position() == 0.0)
            min = pos;
        if (last->position() == 1.0)
            max = pos;
    }

    const int spinMin = qRound(m_ui->positionSpinBox->minimum() * 1000);
    const int spinMax = qRound(m_ui->positionSpinBox->maximum() * 1000);

    const int newMin = qRound(min * 1000);
    const int newMax = qRound(max * 1000);

    m_ui->positionSpinBox->blockSignals(true);
    if (spinMin != newMin || spinMax != newMax) {
        m_ui->positionSpinBox->setRange((double)newMin / 1000, (double)newMax / 1000);
    }
    if (m_ui->positionSpinBox->value() != pos)
        m_ui->positionSpinBox->setValue(pos);
    m_ui->positionSpinBox->blockSignals(false);
}

QGradientStops QtGradientStopsController::gradientStops() const
{
    QGradientStops stops;
    QList<QtGradientStop *> stopsList = d_ptr->m_model->stops().values();
    QListIterator<QtGradientStop *> itStop(stopsList);
    while (itStop.hasNext()) {
        QtGradientStop *stop = itStop.next();
        stops << QPair<qreal, QColor>(stop->position(), stop->color());
    }
    return stops;
}

QtGradientStopsControllerPrivate::PositionColorMap QtGradientStopsControllerPrivate::stopsData(const PositionStopMap &stops) const
{
    PositionColorMap data;
    PositionStopMap::ConstIterator itStop = stops.constBegin();
    while (itStop != stops.constEnd()) {
        QtGradientStop *stop = itStop.value();
        data[stop->position()] = stop->color();

        ++itStop;
    }
    return data;
}

QtGradientStop *QtGradientStopsWidgetPrivate::stopAt(const QPoint &viewportPos) const
{
    double posY = m_handleSize / 2;
    QListIterator<QtGradientStop *> itStop(m_stops);
    while (itStop.hasNext()) {
        QtGradientStop *stop = itStop.next();

        double posX = toViewport(stop->position());

        double x = viewportPos.x() - posX;
        double y = viewportPos.y() - posY;

        if ((m_handleSize * m_handleSize / 4) > (x * x + y * y))
            return stop;
    }
    return 0;
}

void QtGradientStopsModel::moveStops(double newPosition)
{
    QtGradientStop *current = currentStop();
    if (!current)
        return;

    double newPos = newPosition;

    if (newPos > 1)
        newPos = 1;
    else if (newPos < 0)
        newPos = 0;

    if (newPos == current->position())
        return;

    double offset = newPos - current->position();

    QtGradientStop *first = firstSelected();
    QtGradientStop *last = lastSelected();

    if (first && last) { // multiselection
        double maxOffset = 1.0 - last->position();
        double minOffset = -first->position();

        if (offset > maxOffset)
            offset = maxOffset;
        else if (offset < minOffset)
            offset = minOffset;

    }

    if (offset == 0)
        return;

    bool forward = (offset > 0) ? false : true;

    PositionStopMap stopList;

    QList<QtGradientStop *> selected = selectedStops();
    QListIterator<QtGradientStop *> it(selected);
    while (it.hasNext()) {
        QtGradientStop *stop = it.next();
        stopList[stop->position()] = stop;
    }
    stopList[current->position()] = current;

    PositionStopMap::ConstIterator itStop = forward ? stopList.constBegin() : stopList.constEnd();
    while (itStop != (forward ? stopList.constEnd() : stopList.constBegin())) {
        if (!forward)
            --itStop;
        QtGradientStop *stop = itStop.value();
            double pos = stop->position() + offset;
            if (pos > 1)
                pos = 1;
            if (pos < 0)
                pos = 0;

            if (current == stop)
                pos = newPos;

            QtGradientStop *oldStop = at(pos);
            if (oldStop && !stopList.values().contains(oldStop))
                removeStop(oldStop);
            moveStop(stop, pos);

        if (forward)
            ++itStop;
    }
}