运行时可用信号列表

Question

我需要在运行时获取来自特定QWidget的可用信号列表。

例如，QWidget是QPushButton，我想获得此列表：

"clicked()"
"pressed()"
"released()"
"toggled()"
"destroyed()"
...

你能给我一个提示怎么做吗？谢谢

Answer 1

这是获取继承树中所有信号的代码。如果你不需要所有这些，很容易适应你的需求：

的main.cpp

#include <QStringList>
#include <QApplication>
#include <QPushButton>
#include <QMetaObject>
#include <QMetaMethod>
#include <QDebug>

int main(int argc, char **argv)
{
    QApplication application(argc, argv);
    QPushButton pushButton;
    const QMetaObject* metaObject = pushButton.metaObject();
    do {
        for (int i = metaObject->methodOffset(); i < metaObject->methodCount(); ++i) {
            QMetaMethod metaMethod = metaObject->method(i);
            if (metaMethod.methodType() == QMetaMethod::Signal)
                qDebug() << metaMethod.methodSignature();
        }
    } while ((metaObject = metaObject->superClass()));
    return application.exec();
}

main.pro

TEMPLATE = app
TARGET = main
QT += widgets
SOURCES += main.cpp

构建并运行

qmake && make && ./main

输出

"pressed()"
"released()"
"clicked(bool)"
"clicked()"
"toggled(bool)"
"windowTitleChanged(QString)"
"windowIconChanged(QIcon)"
"windowIconTextChanged(QString)"
"customContextMenuRequested(QPoint)"
"destroyed(QObject*)"
"destroyed()"
"objectNameChanged(QString)"