QT关于屏幕保护程序

注：通过继承QApplication，获取全局事件处理权利

，还有一种简单的方法就是new一个widget出来遮住mainwindow

main文件

GlobalApplicationPri 获取事件状态

int main(int argc, char *argv[])
{
    GlobalApplication app(argc, argv);

 
    MainWindow mainWin;
    QSplashScreen *splash = new QSplashScreen;
    app.setWindowInstance(&mainWin,splash);
    splash->setPixmap(QPixmap(":/style/ui_image/load.png"));
    splash->show();//显示图片
    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();
}

GlobalApplication.h文件

#ifndef GLOBALAPPLICATION_H
#define GLOBALAPPLICATION_H
#include <QApplication>
#include <QTimer>
#include <QWidget>
#include <QSplashScreen>
#include <QSettings>
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);//周围状态
public slots:
    void mAcceptGlobalEvent();
    void mAcceptActivationEvent();
signals:
    void    stateChanged();
private:
    QWidget *mwidget;
    QTimer *mtime;
    QSplashScreen *msplash;
    bool mState;
    int sleeptime;
};


class GlobalApplication : public QApplication{
Q_OBJECT
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

GlobalApplication.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)
        {
        }
        // mwidget->keyPress(keyEvent);
    }
    else if (e->type() == QEvent::MouseButtonPress)
    {
        QMouseEvent *mouseEvent = static_cast<QMouseEvent *>(e);
        if (mouseEvent->buttons() == Qt::LeftButton){
            m_obj->setState(true);
        }
        if (mouseEvent->buttons() == Qt::RightButton){

        }
    }

    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;
    sleeptime = 500000;
    mtime = new QTimer(this);
    connect(mtime, SIGNAL(timeout()),this, SLOT(mAcceptGlobalEvent()));
    mtime->start(sleeptime);
    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();
    mState = false;
}



void GlobalApplicationPri::mAcceptActivationEvent()
{
    QSettings setting("config.ini",QSettings::IniFormat);
    if(mState == true){
    mtime->stop();
    mtime->start(setting.value("sleeptime").toInt());
    }else{
    mtime->stop();
    msplash->hide();
    mwidget->show();
    mtime->start(setting.value("sleeptime").toInt());
    }
}

注：通过继承QApplication，获取全局事件处理权利

，还有一种简单的方法就是new一个widget出来遮住mainwindow