C++ QSlider::minimum方法代码示例

/**
  Sets the minimum/maximum value of the channel 0 to seven output sliders.
  Have to do it here because setMinimum is not a slot.

  One added trick: if the slider is at either its max or its min when the value
  is changed, then keep it on the max/min.
  */
void ConfigServoWidget::setChOutRange()
{
    QSpinBox *spinbox = (QSpinBox*)QObject::sender();

    int index = outMin.indexOf(spinbox); // This is the channel number
    if (index < 0)
        index = outMax.indexOf(spinbox); // We can't know if the signal came from min or max

    QSlider *slider = outSliders[index];

    int oldMini = slider->minimum();
    int oldMaxi = slider->maximum();

    if (outMin[index]->value()<outMax[index]->value())
    {
        slider->setRange(outMin[index]->value(), outMax[index]->value());
        reversals[index]->setChecked(false);
    }
    else
    {
        slider->setRange(outMax[index]->value(), outMin[index]->value());
        reversals[index]->setChecked(true);
    }

    if (slider->value() == oldMini)
        slider->setValue(slider->minimum());

//    if (slider->value() == oldMaxi)
//        slider->setValue(slider->maximum());  // this can be dangerous if it happens to be controlling a motor at the time!
}

void SettingsWindow::setLogoRatio(int sliderValue)
{
    QSlider *slider = reinterpret_cast<QSlider *>(sender());
    qreal steps = slider->maximum() - slider->minimum();
    qreal ratio = sliderValue / steps;
    _settings->setLogoSizeRatio(ratio);
}

void checkLimits(HI::GUITestOpStatus &os, int minVal, int maxVal){
    QSlider* thresholdSlider = qobject_cast<QSlider*>(GTWidget::findWidget(os, "thresholdSlider"));
    CHECK_SET_ERR(thresholdSlider != NULL, "thresholdSlider not found");
    int actualSliderMin = thresholdSlider->minimum();
    int actualSliderMax = thresholdSlider->maximum();
    CHECK_SET_ERR(actualSliderMin == minVal, QString("wrong minimal value for slider. Expected: %1, actual: %2").arg(minVal).arg(actualSliderMin));
    CHECK_SET_ERR(actualSliderMax == maxVal, QString("wrong maximim value for slider. Expected: %1, actual: %2").arg(maxVal).arg(actualSliderMin));

    QSpinBox* thresholdSpinBox = qobject_cast<QSpinBox*>(GTWidget::findWidget(os, "thresholdSpinBox"));
    CHECK_SET_ERR(thresholdSpinBox != NULL, "thresholdSpin not found");
    int actualSpinMin = thresholdSpinBox->minimum();
    int actualSpinMax = thresholdSpinBox->maximum();
    CHECK_SET_ERR(actualSpinMin == minVal, QString("wrong minimal value for spin. Expected: %1, actual: %2").arg(minVal).arg(actualSpinMin));
    CHECK_SET_ERR(actualSpinMax == maxVal, QString("wrong maximim value for spin. Expected: %1, actual: %2").arg(maxVal).arg(actualSpinMin));
}

void ZoomWidget::setZoom(qreal zoom)
{
    int intZoom = qRound(zoom * 100);
    d->mZoomLabel->setText(QString("%1%").arg(intZoom));

    // Don't change slider value if we come here because the slider change,
    // avoids choppy sliding scroll.
    if (!d->mZoomUpdatedBySlider) {
        QSlider* slider = d->mZoomSlider->slider();
        SignalBlocker blocker(slider);
        int value = sliderValueForZoom(zoom);

        if (value < slider->minimum()) {
            // It is possible that we are called *before* setMinimumZoom() as
            // been called. In this case, define the minimum ourself.
            d->mZoomSlider->setMinimum(value);
        }
        d->mZoomSlider->setValue(value);
    }
}