Add QmlKey

Author: zhengtianzuo

QmlKey/QmlKey.cpp

@@ -0,0 +1,37 @@
+/*!
+ *@file QmlKey.cpp
+ *@brief Qml全局按键
+ *@version 1.0
+ *@section LICENSE Copyright (C) 2003-2103 CamelSoft Corporation
+ *@author zhengtianzuo
+*/
+#include "QmlKey.h"
+
+QmlKey::QmlKey()
+{
+
+}
+
+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);
+}

QmlKey/QmlKey.h

@@ -0,0 +1,25 @@
+/*!
+ *@file QmlKey.h
+ *@brief Qml全局按键
+ *@version 1.0
+ *@section LICENSE Copyright (C) 2003-2103 CamelSoft Corporation
+ *@author zhengtianzuo
+*/
+#pragma once
+#include <QObject>
+#include <QEvent>
+#include <QKeyEvent>
+
+class QmlKey : public QObject
+{
+    Q_OBJECT
+public:
+    QmlKey();
+
+protected:
+    virtual bool eventFilter(QObject *watched, QEvent *event);
+
+signals:
+    void sKeyBackPress();
+    void sKeyBackRelease();
+};

QmlKey/QmlKey.pro

@@ -0,0 +1,17 @@
+#-------------------------------------------------
+#
+# Copyright (C) 2003-2103 CamelSoft Corporation
+#
+#-------------------------------------------------
+
+QT += qml quick
+
+CONFIG += c++11
+
+SOURCES += main.cpp \
+    QmlKey.cpp
+	
+HEADERS += \
+    QmlKey.h
+	
+RESOURCES += qml.qrc

QmlKey/main.cpp

@@ -0,0 +1,27 @@
+/*!
+ *@file main.cpp
+ *@brief 程序主文件
+ *@version 1.0
+ *@section LICENSE Copyright (C) 2003-2103 CamelSoft Corporation
+ *@author zhengtianzuo
+*/
+#include <QGuiApplication>
+#include <QQmlApplicationEngine>
+#include <QQmlContext>
+#include <QQuickWindow>
+#include "QmlKey.h"
+
+int main(int argc, char *argv[])
+{
+    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+    QGuiApplication app(argc, argv);
+    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()));
+    return app.exec();
+}

QmlKey/main.qml

@@ -0,0 +1,35 @@
+/*!
+ *@file main.qml
+ *@brief 主文件
+ *@version 1.0
+ *@section LICENSE Copyright (C) 2003-2103 CamelSoft Corporation
+ *@author zhengtianzuo
+*/
+import QtQuick 2.7
+import QtQuick.Controls 2.0
+import QtQuick.Layouts 1.0
+import QtQuick.Window 2.2
+
+Window {
+    id: frmWindow
+    visible: true
+    width: 400
+    height: 300
+    title: qsTr("Qml全局按键")
+
+    Label{
+        id: label
+        text: qsTr("文本")
+        height: 48
+        width: 120
+        anchors.centerIn: parent
+    }
+
+    function onSKeyBackPress(){
+        label.text = qsTr("按下了Backspace")
+    }
+
+    function onSKeyBackRelease(){
+        label.text = qsTr("松开了Backspace")
+    }
+}

QmlKey/qml.qrc

@@ -0,0 +1,5 @@
+<RCC>
+    <qresource prefix="/">
+        <file>main.qml</file>
+    </qresource>
+</RCC>

QmlKey/show.gif

@@ -34,3 +34,4 @@ SUBDIRS += QmlProgress
 SUBDIRS += QmlWinExtras
 SUBDIRS += QmlCalendar
 SUBDIRS += QmlCanvasText
+SUBDIRS += QmlKey

QtQuickExamples.pro

@@ -152,3 +152,8 @@ QmlCanvasText: QmlCanvas文字
 
 ![](https://github.com/zhengtianzuo/QtQuickExamples/blob/master/QmlCanvasText/show.jpg?raw=true)
 
+
+QmlKey: Qml全局按键
+
+![](https://github.com/zhengtianzuo/QtQuickExamples/blob/master/QmlKey/show.gif?raw=true)
+