conversionscreen.cpp

嵌入式LINUX下一个使用QT编写的看上去与水银温度计一样来显示摄氏温度的温度转换的例子。

#include <QPushButton>
#include <QSlider>
#include <QLabel>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QApplication>

#include "ConversionScreen.h"

ConversionScreen::ConversionScreen() : QWidget()
{
    createScreen();
}

void ConversionScreen::createScreen()
{
    QPushButton* quit = new QPushButton("Quit");

    QSlider* slider = new QSlider(Qt::Vertical);
    slider->setRange(0, 100);
    slider->setValue(0);
    slider->setTickPosition(QSlider::TicksLeft);

    QLabel* label = new QLabel("0");
    
    QHBoxLayout* cLayout = new QHBoxLayout;
    cLayout->addWidget(label, 0, Qt::AlignRight);
    cLayout->addWidget(slider, 0, Qt::AlignLeft);
    
    QVBoxLayout* mainLayout = new QVBoxLayout;
    mainLayout->addWidget(quit);
    mainLayout->addLayout(cLayout);
    setLayout(mainLayout);

    slider->setFocus();
    
    connect(quit, SIGNAL(clicked()), qApp, SLOT(quit()));
    connect(slider, SIGNAL(valueChanged(int)), label, SLOT(setNum(int)));
}