QT源码阅读 -- QTimer

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#ifndef QTIMER_H#define QTIMER_H#ifndef QT_NO_QOBJECT#include <QtCore/qbasictimer.h> // conceptual inheritance#include <QtCore/qobject.h>QT_BEGIN_HEADERQT_BEGIN_NAMESPACEQT_MODULE(Core)<span style="white-space:pre">//处理QT许可证信息；class Q_CORE_EXPORT QTimer : public QObject{    Q_OBJECT    Q_PROPERTY(bool singleShot READ isSingleShot WRITE setSingleShot)    Q_PROPERTY(int interval READ interval WRITE setInterval)    Q_PROPERTY(bool active READ isActive)public:    explicit QTimer(QObject *parent = 0);<span style="white-space:pre">//防止隐式转换;#ifdef QT3_SUPPORT    QT3_SUPPORT_CONSTRUCTOR QTimer(QObject *parent, const char *name);#endif    ~QTimer();    inline bool isActive() const { return id >= 0; }<span style="white-space:pre">//是否处于激活状态，通过判断id是否大于0判断;    int timerId() const { return id; }// 返回timer ID;    void setInterval(int msec);// 设置间隔时间，既超时时间;    int interval() const { return inter; }//获取间隔时间;    inline void setSingleShot(bool singleShot);<span style="white-space:pre">// 设置是否属于SingleShot,既是否只触发一次;    inline bool isSingleShot() const { return single; }// 获取是否是SingleShot;    static void singleShot(int msec, QObject *receiver, const char *member);//这个静态函数非常方便使用，我们既可以不创建一个QTimer对象，也可不用发射一个信号出去，就可以完成timer的功能， QTimer::singleShot(600000, &app, SLOT(quit()));public Q_SLOTS:<span style="white-space:pre">// QT4.1引入的，其实就是用来替代slots;    void start(int msec);<span style="white-space:pre">// start slot;    void start();    void stop();// stop slot;#ifdef QT3_SUPPORT    inline QT_MOC_COMPAT void changeInterval(int msec) { start(msec); }    QT_MOC_COMPAT int start(int msec, bool sshot);#endifQ_SIGNALS:    void timeout();// timeout 信号;protected:    void timerEvent(QTimerEvent *);<span style="white-space:pre">// 对 QObject::timerEvent的reimplemented;private:    Q_DISABLE_COPY(QTimer)<span style="white-space:pre">    inline int startTimer(int){ return -1;}    inline void killTimer(int){}    int id, inter, del;    uint single : 1;    uint nulltimer : 1;};inline void QTimer::setSingleShot(bool asingleShot) { single = asingleShot; }QT_END_NAMESPACEQT_END_HEADER#endif // QT_NO_QOBJECT#endif // QTIMER_H
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