2024-07-12
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Utere QT ad cognoscendum munus aptationis screen claritatis: cum nullus est velum vel tactus, splendor screen deprimitur, et si tactus est, splendor screen clarissimis componitur.
Scopus fabrica utitur systema Linux embedded, et mandatum ad claritatem screen adaptandum est:
echo x > /sys/class/backlight/backlight/brightness #x范围为0~10
Dubium non est in hoc mandato utendo termino. Cum tamen QProcess utens ad hoc mandatum exequendum, nulla est responsio nec nuntius erroris.
Postremo inveni me opus hoc uti imperio;
/bin/sh -c "echo x > /sys/class/backlight/backlight/brightness" #x为亮度值
Propositum codicis hoc modo impletur:
- QProcess setBright(this);// 进程函数,调用外部指令窗口
- setBright.start("cat /sys/class/backlight/backlight/brightness n"); #获取当前亮度值
- setBright.waitForFinished(); // 等待命令执行完成
- QString strCmd = QString("/bin/sh -c "echo %1 > /sys/class/backlight/backlight/brightness"").arg(brightness/10);
- //执行指令
- setBright.start(strCmd.toLocal8Bit().data()); //convert QString to char
- setBright.waitForFinished(1000);// 等待指令执行完毕
- QString strErrors = setBright.readAllStandardError();// 获取返回值
- qDebug()<<strErrors;
Si screen per aliquod temporis spatium non clicked, velum obscurabitur vel avertitur. Si tactus (i.e. muris press/move) eventum est, expergisci et screen accendere.
Cum fenestra est, relative simplex exsecutio est. Sicut eventus mus efficiendi responsionis in genere fenestrarum potestate. In sample codice talis est:
- //h
- protected:
- void mousePressEvent(QMouseEvent *event);
- void mouseMoveEvent(QMouseEvent *event);
- void mouseReleaseEvent(QMouseEvent *event);
- //cpp
- void MainWindow::mousePressEvent(QMouseEvent *event)
- {
- qDebug() << "Mouse pressed";
- mScreenSleep->ToWake(); //唤醒屏幕
- }
- void MainWindow::mouseMoveEvent(QMouseEvent *event)
- {
- qDebug() << "Mouse moved";
- mScreenSleep->ToWake(); //唤醒屏幕
- }
- void MainWindow::mouseReleaseEvent(QMouseEvent *event)
- {
- qDebug() << "Mouse released";
- mScreenSleep->ToWake(); //唤醒屏幕
- }
Nota: Muris eventus nonnisi ad intra fenestras imperium responderi potest. Classis QApplicationis uti potes ut respondeas eventibus extra fenestram imperium.
Problema: Cum fenestra sit plena velum et ad diaphanum profectus, screen non potest flecti postquam avertit se.
In sample codice talis est:
- //h
- #ifndef GLOBALAPP_H
- #define GLOBALAPP_H
-
- #include <QApplication>
- #include "screensleep.h" //屏幕亮度控制类
-
- class globalapp : public QApplication
- {
- public:
- globalapp(int &argc,char **argv);
- ~globalapp();
- ScreenSleep *mScreenSleep;
-
- bool notify(QObject*, QEvent *);
- };
-
- #endif // GLOBALAPP_H
-
- //cpp
- #include "globalapp.h"
- #include <QDebug>
-
- globalapp::globalapp(int &argc,char **argv):QApplication(argc,argv)
- {
- mScreenSleep = new ScreenSleep(this);
- }
- globalapp::~globalapp()
- {
- delete mScreenSleep;
- }
- bool globalapp::notify(QObject *obj, QEvent *e)
- {
- if(e->type() == QEvent::KeyPress || e->type() == QEvent::MouseButtonPress || e->type() == QEvent::MouseMove)
- {
- mScreenSleep->ToWake();
- }
- else if(e->type() == QEvent::SockAct) //为什么响应的是这个事件???
- {
- mScreenSleep->ToWake();
- }
- return QApplication::notify(obj,e);
- }
- //main
- int main(int argc, char *argv[])
- {
- globalapp a(argc, argv); //使用自建的QApplication对象
- return a.exec();
- }
In sample codice talis est:
- #include <QApplication>
- #include <QMouseEvent>
- #include <QDebug>
-
- class MouseHook : public QObject {
- bool eventFilter(QObject *obj, QEvent *event) override {
- if (event->type() == QEvent::MouseMove) {
- QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(event);
- //放置事件处理
- }
- else if(event->type() == QEvent::SockAct)
- {
- QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(event);
- //放置事件处理
- }
- return QObject::eventFilter(obj, event);
- }
- };
- int main(int argc, char *argv[])
- {
- MouseHook mouseHook;
- a.installEventFilter(&mouseHook);
- return a.exec();
- }
Ut videre potes e commentis superioribus, cum fenestra nulla est, eventus mus cliccum vel tactus non est par mus eventu ab QT definito, sed eventu QEvent::SockAct!
Quod cur ita sit, nondum ratio inventa, sed magna fovea est!