单个项目中有多个窗口 [英] Multiple windows in a single project

问题描述

我的项目要求在一个屏幕(一个发送器，一个接收器)上分别显示两个QML Window.这两个.qml都要求我在其中包含一些Cpp模型，因此，我正在使用QQmlApplicationEngine注册Cpp模型.

I have a requirement for my project to display two QML Windows each on one of the screen (one sender, one receiver). Both of the .qml requires me to include some Cpp models inside hence, I'm using QQmlApplicationEngine to register the Cpp models.

我发现使用QWidget::createWindowContainer()可以为单个项目显示多个Window.对于第一个QML文件，这工作得很好.代码段如下所示:

I found out that using QWidget::createWindowContainer() I'm able to display multiple Windows for a single project. This works perfectly fine for the first QML file. The code snippets looks like this:

QQmlApplicationEngine* engine = new QQmlApplicationEngine(Qurl("main.qml"));
QmlContext* context = engine.getContextProperty();

//do some Cpp models registering...

QQuickview *view = new QQuickview(engine,0);
QWidget* container = widget::createWindowContainer(view);  
//I realized I dont need to do container->show(); for the main.qml to appear..

//use desktop widget to move the 2nd container to the 2nd screen...

我决定使用类似的方法为我的receive.qml创建第二个应用程序引擎.我很快意识到，即使使用container2->show()，receive.qml也将永远无法打开.现在，它显示一个空白页.

I decided to create a 2nd application engine for my receive.qml with a similar method. I soon realized that the receive.qml would never open even with container2->show(). Now, it is showing an empty page.

我的问题是:

1. 我的方法是正确的还是对此有更好的解决方案?
2. 我需要注意什么信号才能关闭窗户 事件?我似乎无法检测到信号时， 窗口关闭.当我想关闭两者时 检测到.

1. Is my approach correct or is there a better solution for this?
2. What signal do I need look out for to catch the window close event? I cant seem to be able to detect the signal when one of the window is closed. as I wanted to close the both when one has been detected.

推荐答案

可以轻松完成，例如:

main.qml

import QtQuick 2.3
import QtQuick.Window 2.2

Item {

    Window {
        objectName: "wnd1"
        visible: true
    }

    Window {
        objectName: "wnd2"
        visible: true
    }
}

因此您可以从C ++代码访问这些窗口:

And so you can access these windows from C++ code:

main.cpp

QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    QQuickWindow *wnd1 = engine.rootObjects()[0]->findChild<QQuickWindow *>("wnd1");
    if(wnd1)
        wnd1->setTitle("Server");
    QQuickWindow *wnd2 = engine.rootObjects()[0]->findChild<QQuickWindow *>("wnd2");
    if(wnd2)
        wnd2->setTitle("Client");

要捕获结束事件，您应该使用 QQuickWindow :: closing 事件

To catch a closing event you should use QQuickWindow::closing event

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