获得"被摧毁" Qt脚本中的信号

时间:2014-10-22 11:54:46

标签: c++ qt qt5 qt-signals qtscript

如何从Qt脚本正确连接到QObject的destroyed信号?

当我像平均信号一样连接它时,它不起作用。我做了测试,我删除了对象,其他QObjects确实得到了信号,但我没有调用连接到它的脚本函数。

以下是我用于测试的样本。最重要的部分是这一行:

_engine.evaluate("obj.destroyed.connect(function() { debug(\"obj destroyed\") })");

我希望它在obj被销毁时调用该函数。下面的代码确保在偶数循环已经启动时删除对象,并且它还测试对象确实向另一个QObject发送destroyed信号。我要修复的是脚本在发出debug("obj destroyed")信号后用destroyed调用脚本函数。

ScriptTester.h:

#ifndef SCRIPTTESTER_H
#define SCRIPTTESTER_H

#include <QtScript>
#include <QtCore>

class ScriptTester: public QObject {
    Q_OBJECT

public:
    explicit ScriptTester(QObject *parent = 0);

private slots:
    void signalTest();
    void boo();

private:
    QScriptEngine _engine;
};

#endif // SCRIPTTESTER_H

ScriptTester.cpp:

#include "ScriptTester.h"

static QScriptValue scriptDebug(QScriptContext *context, QScriptEngine *engine) {
    Q_UNUSED(engine);
    if (context->argumentCount() >= 1) {
        QString msg = context->argument(0).toString();
        for (int i = 1; i < context->argumentCount(); ++i) {
            msg = msg.arg(context->argument(i).toString());
        }
        qDebug() << msg;
    }
    return QScriptValue();
}

ScriptTester::ScriptTester(QObject *parent) :
    QObject(parent)
{
    QTimer::singleShot(0, Qt::CoarseTimer, this, SLOT(signalTest()));
    _engine.globalObject().setProperty("debug", _engine.newFunction(scriptDebug, 1));
}

void ScriptTester::signalTest() {
    QObject *obj = new QObject(this);
    _engine.globalObject().setProperty("obj", _engine.newQObject(obj));
    _engine.evaluate("obj.destroyed.connect(function() { debug(\"obj destroyed\") })");
    if (_engine.hasUncaughtException()) {
        qDebug() << "Exception:" << _engine.uncaughtException().toString();
    }
    connect(obj, SIGNAL(destroyed()), this, SLOT(boo()));

    QTimer *timer = new QTimer;
    _engine.globalObject().setProperty("timer", _engine.newQObject(timer));
    _engine.evaluate("timer.timeout.connect(function() { debug(\"timer timeout\"); obj.deleteLater(); })");
    if (_engine.hasUncaughtException()) {
        qDebug() << "Exception:" << _engine.uncaughtException().toString();
    }

    timer->setSingleShot(true);
    timer->start(100);
}

void ScriptTester::boo() {
    qDebug() << "was destroyed!";
}

请注意,我不希望黑客首先将destroyed传递给C ++代码,然后手动或通过信号通知脚本。我正在寻找在脚本中完全完成的实现。

0 个答案:

没有答案