clock.cpp

程序代码使用说明： (1)所有源代码目录下都提供了Makefile（非Qt）

#include "Clock.h"

#include <QSettings>
#include <QApplication>
#include <QLabel>
#include <QTimer>
#include <QMessageBox>
#include <ClockFace.h>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QTimeEdit>
#include <QComboBox>
#include <QPushButton>
#include <QGroupBox>
#include <QGridLayout>
#include <QTime>
#include <QDateTime>

#include <time.h>
#include <errno.h>


Clock::Clock(QWidget *parent, Qt::WFlags f)
    : QWidget(parent, f)
{
    setWindowTitle("My Clock");
    setGeometry(0, 20, 320, 220);

    readSettings();

    clockFace = new ClockFace;
    clockFace->setGeometry(0, 0, 180, 180);
    
    timeEditor = new QTimeEdit;
    setEditorFormat();

    formatCombo = new QComboBox;
    formatCombo->addItem("12 Hour Clock", QVariant((int)CLOCK_12_HOUR));
    formatCombo->addItem("24 Hour Clock", QVariant((int)CLOCK_24_HOUR));
    setComboIndex();
    
    QLabel *timeText = new QLabel("Change Time:");
    QLabel *formatText = new QLabel("Change Time Format:");
    
    QPushButton* quitBtn = new QPushButton("Quit");
    QPushButton* saveBtn = new QPushButton("Save");
    
    // layout widgets
    QHBoxLayout *hlBtns = new QHBoxLayout;
    hlBtns->addWidget(quitBtn);
    hlBtns->addWidget(saveBtn);
    
    QGroupBox *groupBox = new QGroupBox("Change Settings:");
    QVBoxLayout *vlSettings = new QVBoxLayout;
    vlSettings->addWidget(timeText);
    vlSettings->addWidget(timeEditor);
    vlSettings->addWidget(formatText);
    vlSettings->addWidget(formatCombo);
    groupBox->setLayout(vlSettings);

    QVBoxLayout *vlPack = new QVBoxLayout;
    vlPack->addWidget(groupBox);
    vlPack->addStretch(1);
    vlPack->addLayout(hlBtns);
    
    QHBoxLayout *mainLayout = new QHBoxLayout;
    mainLayout->addWidget(clockFace);
    mainLayout->addLayout(vlPack);
    mainLayout->setSpacing(20);
    setLayout(mainLayout);

    formatCombo->setFocus();

    connect(quitBtn, SIGNAL(clicked()), qApp, SLOT(quit()));
    connect(saveBtn, SIGNAL(clicked()), this, SLOT(saveSettings()));    
    connect(formatCombo, SIGNAL(currentIndexChanged(int)), this, SLOT(updateFormat(int)));
    connect(timeEditor, SIGNAL(timeChanged(const QTime&)), this, SLOT(changeClock(const QTime&)));

    QTimer::singleShot( 0, this, SLOT(updateClock()));
    
    t = new QTimer(this);
    connect(t, SIGNAL(timeout()), this, SLOT(updateClock()));
    t->start(1000);
}

Clock::~Clock()
{
}

void Clock::updateClock()
{
    if (timeEditor->hasFocus())
        return;
    
    QTime ct = QTime::currentTime();
    clockFace->display(ct);
    timeEditor->setTime(ct);
}

void Clock::changeClock(const QTime& time)
{
    clockFace->display(time);
}

void Clock::readSettings()
{
    QSettings cfg("./MyClock.ini", QSettings::IniFormat);
    timeFormat = (TimeFormat)(cfg.value("Time/Format", 0).toInt());
}

void Clock::setComboIndex()
{
    int index = formatCombo->findData(QVariant((int)timeFormat));
    if (index > 0)
    {
        formatCombo->setCurrentIndex(index);
    }
}


void Clock::saveSettings()
{
    // change the system time
    QDateTime dt = QDateTime::currentDateTime();
    dt.setTime(timeEditor->time());
    time_t tt = (time_t)dt.toTime_t();
    int r = stime(&tt);

    if (r)
    {
        if (errno == EPERM)
            QMessageBox::warning(this, "Error", "You don't have permission to change system time.");
    }
    
    // save time format
    QSettings cfg("./MyClock.ini", QSettings::IniFormat);
    cfg.setValue("Time/Format", QVariant((int)timeFormat));
    qApp->quit();
}

void Clock::updateFormat(int index)
{
    // get current selected time format
    timeFormat = (TimeFormat)(formatCombo->itemData(index).toInt());
    
    setEditorFormat();
}

void  Clock::setEditorFormat()
{
    QString formatStr = NULL;
    
    switch (timeFormat)
    {
    case CLOCK_12_HOUR:
        formatStr = "hh:mm AP";
        break;
    case CLOCK_24_HOUR:
    default:
        formatStr = "hh:mm";
        break;
    }

    timeEditor->setDisplayFormat(formatStr);
}