QGC之MainWindow

ui\MainWindow.cc

在QGCApplication中调用了MainWindow::_create()

MainWindow * MainWindow::_create(){    new MainWindow();    return _instance;}

在MainWindow的构造方法，构造方法是私有的，为了得到一个单例的MainWindow，只有在MainWindow::_create()方法中调用构造方法，其余代码都应该无权限调用此构造方法。

MainWindow::MainWindow()        :_mavlinkDecoder        (NULL)        ,_lowPowerMode          (false)        ,_showStatusBar         (false)        ,_mainQmlWidgetHolder   (null)        ,_forceClose          (false){    _instance=this;    //设置用户界面    loadSettings();    emit initStatusChanged(tr("Setting up user interface"),Qt::AlignLeft|Qt::AlignBottom,QColor(62,93,141));    _ui.setupUi(this);    setMinimunWidth(1008);    configureWindowName();    //setup central widget with a layout to hold the views    _centralLayout=new QVBoxLayout();    _centralLayout->setContentsMargins(0,0,0,0);    centralWidget()->setLayout(_centralLayout);    //主要qml相关    _mainQmlWidgetHolder=new QGCQmlWidgetHolder(QString(),NULL,this);    _centralLayout->addwidget(_mainQmlWidgetHolder);    _mainQmlWidgetHolder->setVisible(true);    //QQmlEngine相关    QQmlEngine::setObjectOwnership(this,QQmlEngine::CPPOwnership);    _mainQmlWidgetHolder->setContextPropertyObject("controller",this);    _mainQmlWidgetHolder->setContextPropertyObject("debugMessageModel",APPMessage::getModel());    _mainQmlWidgetHolder->setSource(QUrl::fromUserInput("qrc:qml/MainWindowHybrid.qml"));    //image provider    QQuickImageProvider *pImgProvider=dynamic_cast<QQuickImageProvider *>(    qgcApp()->toolbox()->imageProvider());    _mainQmlWidgetHolder->getEngine()->addImageProvider(QLatin1String("QGCImages"),pImgProvider);    setDockOptions(0);    setCorner(Qt::BottomRightCorner,Qt::BottomDockWidgetArea);    )}