bitratebox.cpp Example File

can/bitratebox.cpp
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 #include "bitratebox.h"

 #include <QLineEdit>

 BitRateBox::BitRateBox(QWidget *parent) :
     QComboBox(parent),
     m_customSpeedValidator(new QIntValidator(0, 1000000, this))
 {
     fillBitRates();

     connect(this, QOverload<int>::of(&QComboBox::currentIndexChanged),
             this, &BitRateBox::checkCustomSpeedPolicy);
 }

 BitRateBox::~BitRateBox()
 {
     delete m_customSpeedValidator;
 }

 int BitRateBox::bitRate() const
 {
     if (currentIndex() == (count() - 1))
         return currentText().toInt();

     return itemData(currentIndex()).toInt();
 }

 bool BitRateBox::isFlexibleDataRateEnabled() const
 {
     return m_isFlexibleDataRateEnabled;
 }

 void BitRateBox::setFlexibleDateRateEnabled(bool enabled)
 {
     m_isFlexibleDataRateEnabled = enabled;
     m_customSpeedValidator->setTop(enabled ? 10000000 : 1000000);
     fillBitRates();
 }

 void BitRateBox::checkCustomSpeedPolicy(int idx)
 {
     const bool isCustomSpeed = !itemData(idx).isValid();
     setEditable(isCustomSpeed);
     if (isCustomSpeed) {
         clearEditText();
         lineEdit()->setValidator(m_customSpeedValidator);
     }
 }

 void BitRateBox::fillBitRates()
 {
     const QList<int> rates = {
         10000, 20000, 50000, 100000, 125000, 250000, 500000, 800000, 1000000
     };
     const QList<int> dataRates = {
         2000000, 4000000, 8000000
     };

     clear();

     for (int rate : rates)
         addItem(QString::number(rate), rate);

     if (isFlexibleDataRateEnabled()) {
         for (int rate : dataRates)
             addItem(QString::number(rate), rate);
     }

     addItem(tr("Custom"));
     setCurrentIndex(6); // default is 500000 bits/sec
 }