首先，要寫一個屏保程序，需要一個定時器來統計多長時間沒有處理事件進入休眠，

第二，事件處理是一個全局性的，過濾處理事件，

//直接上源碼吧，自己改改。重寫Application #ifndef GLOBALAPPLICATION_H #define GLOBALAPPLICATION_H #include <QApplication> #include <QTimer> #include <QWidget> #include <QSplashScreen> class GlobalApplicationPri : public QWidget { Q_OBJECT Q_PROPERTY(bool mState READ state WRITE setState NOTIFY stateChanged) public: explicit GlobalApplicationPri(QWidget *parent = 0); ~GlobalApplicationPri(); void setWindowInstance(QWidget*wnd,QSplashScreen *); bool state(); void setState(bool);//周圍狀態 public slots: void mAcceptGlobalEvent(); void mAcceptActivationEvent(); signals: void stateChanged(); private: QWidget *mwidget; QTimer *mtime; QSplashScreen *msplash; bool mState; }; class GlobalApplication : public QApplication{ public: GlobalApplication(int &argc,char **argv,QWidget *parent = 0); ~GlobalApplication(); bool notify(QObject*, QEvent *); void setWindowInstance(QWidget*wnd,QSplashScreen *); private: GlobalApplicationPri *m_obj; QWidget *mwidget; QSplashScreen *msplash; }; #endif // GLOBALAPPLICATION_H

下面是.cpp文件

#include "globalapplication.h" #include <QKeyEvent> #include <QDebug> GlobalApplication::GlobalApplication(int &argc,char **argv,QWidget *parent):QApplication(argc,argv) {m_obj = new GlobalApplicationPri();}GlobalApplication::~GlobalApplication() {delete m_obj; }bool GlobalApplication::notify(QObject *obj, QEvent *e) {const QMetaObject* objMeta = obj->metaObject();QString clName = objMeta->className();if(e->type() == QEvent::KeyPress){QKeyEvent *keyEvent = static_cast<QKeyEvent *>(e);if(keyEvent->key() == Qt::Key_F1){qDebug()<< clName;qDebug() << "F1";}}else if(e->type() == QEvent::MouseButtonPress){QMouseEvent *mouseEvent = static_cast<QMouseEvent *>(e);if(mouseEvent->buttons() == Qt::LeftButton){qDebug() << "left";m_obj->setState(true);}if(mouseEvent->buttons() == Qt::RightButton){qDebug() << "Right";}}return QApplication::notify(obj,e); }void GlobalApplication::setWindowInstance(QWidget *wnd,QSplashScreen *splash) {mwidget = wnd;msplash = splash;m_obj->setWindowInstance(wnd,splash); }GlobalApplicationPri::GlobalApplicationPri(QWidget *parent) {mwidget = Q_NULLPTR;mtime = Q_NULLPTR;msplash = Q_NULLPTR;mtime = new QTimer(this);connect(mtime, SIGNAL(timeout()),this, SLOT(mAcceptGlobalEvent()));mtime->start(20000);connect(this, SIGNAL(stateChanged()),this, SLOT(mAcceptActivationEvent())); }GlobalApplicationPri::~GlobalApplicationPri() {}void GlobalApplicationPri::setWindowInstance(QWidget *wnd, QSplashScreen *splash) {mwidget = wnd;msplash = splash; }bool GlobalApplicationPri::state() {return mState; }void GlobalApplicationPri::setState(bool mcont) {mState = mcont;emit stateChanged(); }void GlobalApplicationPri::mAcceptGlobalEvent() {mwidget->hide();msplash->show(); }void GlobalApplicationPri::mAcceptActivationEvent() {mtime->stop();msplash->hide();mwidget->show();mtime->start(20000); }

最后來看看主函數

#include "mainwindow.h" #include <QApplication>using namespace LENSOMETER;#include <QObject> #include <QApplication> #include <QFontDatabase> #include <QSplashScreen> #include "../../common/global/globalapplication.h" #include "mainwindow.h" #include <QThread>int main(int argc, char *argv[]) {GlobalApplication app(argc, argv);// // /// \brief splash // ///MainWindow mainWin;QSplashScreen *splash = new QSplashScreen;app.setWindowInstance(&mainWin,splash);splash->setPixmap(QPixmap(":/ui_image/load.png"));splash->show();//顯示圖片Qt::Alignment topRight = Qt::AlignRight | Qt::AlignTop;splash->showMessage(QObject::tr("Setting up the main window..."),topRight, Qt::white);splash->showMessage(QObject::tr("Loading modules..."),topRight, Qt::white);splash->showMessage(QObject::tr("Establishing connections..."),topRight, Qt::white);QThread::sleep(1);mainWin.show();splash->finish(&mainWin);return app.exec(); }

總結

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