cel.cpp

在嵌入式LINUX下

#include <QPushButton>
#include <QSlider>
#include <QLabel>
#include <QLCDNumber>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QApplication>
#include <QCopChannel>
#include <QDataStream>
#include <QByteArray>

#include "Cel.h"

Cel::Cel() : QWidget()
{
    createScreen();
    listenChannel();
}

void Cel::createScreen()
{
    QPushButton* quitBtn = new QPushButton("Quit");

    createCel();

    QVBoxLayout *mainLayout = new QVBoxLayout;
    mainLayout->addWidget(quitBtn);
    mainLayout->addLayout(celLayout);
    setLayout(mainLayout);

    slider->setFocus();
    
    connect(quitBtn, SIGNAL(clicked()), qApp, SLOT(quit()));

    setWindowTitle("Celsius");
}

void Cel::createCel()
{
    slider = new QSlider(Qt::Vertical);
    slider->setRange(0, 100);
    slider->setValue(0);
    slider->setTickPosition(QSlider::TicksLeft);
    
    QLabel* celLabel = new QLabel("0");
    
    celLayout = new QHBoxLayout;
    celLayout->addWidget(celLabel, 0, Qt::AlignRight);
    celLayout->addWidget(slider, 0, Qt::AlignLeft);    
    celLayout->setSpacing(10);

    connect(slider, SIGNAL(valueChanged(int)), celLabel, SLOT(setNum(int)));
    connect(slider, SIGNAL(valueChanged(int)), this, SLOT(sendMsg(int)));
}

void Cel::fahToCel(int fahNum)
{
    int celNum = (fahNum - 32) * 5 / 9;
    slider->setValue(celNum);
}

void Cel::listenChannel()
{
    QCopChannel *channel = new QCopChannel("/System/Temperature", this);
    connect(channel, SIGNAL(received(const QString &, const QByteArray &)),
            this, SLOT(handleMsg(const QString &, const QByteArray &)));
}

void Cel::handleMsg(const QString &message, const QByteArray &data)
{
    QDataStream in(data);
    
    if (message == "ConvertFahToCel(int)")
    {
        int fahNum;
        in >> fahNum;
        fahToCel(fahNum);
    }
}

void Cel::sendMsg(int celNum)
{
    QByteArray data;
    QDataStream out(&data, QIODevice::WriteOnly);
    out << celNum;
    QCopChannel::send("/System/Temperature", "ConvertCelToFah(int)", data);
}