Question

我正在编写一个简单的程序（ C ++ ， QT ， QML ），我想在其中实现resizeEvent然后使用一些图案来确定窗口的高度和宽度。我的问题是，当我调整窗口大小时，不会调用resizeEvent。我认为我做错了什么，但我不确定它是什么。任何想法将不胜感激。

main.cpp

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    QGuiApplication app(argc, argv);
    QQmlApplicationEngine engine;
    engine.load(QUrl(QLatin1String("qrc:/main.qml")));
    QObject *root = engine.rootObjects().first();
    class CMaze maze(root,&engine);
    return app.exec();
}

CMaze.h

class CMaze: public QWindow
{
public:
    CMaze(QObject *root, QQmlApplicationEngine *engine);
private:
    QObject *root;
    QQmlApplicationEngine *engine;
    /*+ Some other variables*/
    void resizeEvent(QResizeEvent *event);
};

CMaze.cpp

CMaze::CMaze(QObject *root,QQmlApplicationEngine *engine)
{
    this->root = root;
    this->engine = engine;
    /* + Some other functionality*/
}
void CMaze::resizeEvent(QResizeEvent *event)
{
    qDebug() << "resize event entered"; // NEVER WRITTEN to CONSOLE WHEN RESIZING 
}

修改

main.qml：

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("The Maze")

    Rectangle{
        id: background
        objectName: "background"
        anchors.fill: parent
        color: "#ffffcc"
    }
}

Answer 1

你要声明2个窗口：C ++代码中的QWindow（你称之为“错误”窗口的那个）与你的QML完全无关，而你的QML中的ApplicationWindow没有调整大小处理程序。你应该合并这两个窗口。我建议你进行以下重构，基于类QQuickView，这是一个带有集成QML引擎的窗口：

CMaze.h：

class CMaze: public QQuickView
{
public:
    /* QQuickView already has a QML engine and a root object */
    CMaze(/*QObject *root, QQmlApplicationEngine *engine*/);
private:
    // QObject *root;
    // QQmlApplicationEngine *engine;

    /*+ Some other variables*/

protected: /* respect inherited scope */
    /* use override to prevent misdeclaration*/
    void resizeEvent(QResizeEvent *event) override;

};

CMaze.cpp：

CMaze::CMaze(/*QObject *root,QQmlApplicationEngine *engine*/)
{
    //this->root = root; /* replaced by this->rootObject() */
    //this->engine = engine; /* replaced by this->engine() */

    /* + Some other functionality*/
}
void CMaze::resizeEvent(QResizeEvent *event)
{
    qDebug() << "resize event entered";
}

main.cpp中：

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    QGuiApplication app(argc, argv);
    // QQmlApplicationEngine engine;
    // engine.load(QUrl(QLatin1String("qrc:/main.qml")));
    // QObject *root = engine.rootObjects().first();
    CMaze maze; //(root,&engine);
    /* set QML source on maze */
    maze.setSource(QUrl(QLatin1String("qrc:/main.qml")));
    /* show the view */
    maze.show();
    return app.exec();
}

main.qml：

// you already have the window: just keep the rectangle
Rectangle{
    id: background
    objectName: "background"
    anchors.fill: parent
    color: "#ffffcc"
}

从QT中继承自QWindow的另一个类调整事件大小

1 个答案: