| zhengtianzuo | 2017-11-01 15:36 |
zhengtianzuo系列-Qml全局按键创建一个c++类 对事件进行监听``` bool QmlKey::eventFilter(QObject *watched, QEvent *event) { if (event->type() == QEvent::KeyPress) { QKeyEvent *keyEvent = static_cast<QKeyEvent*>(event); if (keyEvent->key() == Qt::Key_Backspace) { emit sKeyBackPress(); return(true); } } if (event->type() == QEvent::KeyRelease) { QKeyEvent *keyEvent = static_cast<QKeyEvent*>(event); if (keyEvent->key() == Qt::Key_Backspace) { emit sKeyBackRelease(); return(true); } } return QObject::eventFilter(watched, event); } ``` 注册并连接信号槽 ``` QmlKey qmlKey; QQmlApplicationEngine engine; engine.rootContext()->setContextProperty("qmlKey", &qmlKey); engine.load(QUrl(QLatin1String("qrc:/main.qml"))); QObject *root = engine.rootObjects()[0]; root->installEventFilter(&qmlKey); QObject::connect(&qmlKey, SIGNAL(sKeyBackPress()), root, SLOT(onSKeyBackPress())); QObject::connect(&qmlKey, SIGNAL(sKeyBackRelease()), root, SLOT(onSKeyBackRelease())); ``` Qml中信号槽: ``` function onSKeyBackPress(){ label.text = qsTr("按下了Backspace") } function onSKeyBackRelease(){ label.text = qsTr("松开了Backspace") } ```  需要完整代码请访问 QtQuickExamples |
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