C++ Qt信号映射:编辑发射器对象
所以我动态地创建QPushButton对象,然后映射它们以发出信号。 从与信号关联的插槽中,我想要编辑对象的属性(在本例中为文本,即QPushButton::text()) 在头文件中的类“dialog”中,我有:C++ Qt信号映射:编辑发射器对象,c++,qt,signals,slot,qpushbutton,C++,Qt,Signals,Slot,Qpushbutton,所以我动态地创建QPushButton对象,然后映射它们以发出信号。 从与信号关联的插槽中,我想要编辑对象的属性(在本例中为文本,即QPushButton::text()) 在头文件中的类“dialog”中,我有: private: QSignalMapper *signalMapper; private slots: void buttonGeneric(QPushButton &button); signals: void clicked(QPushButton
private:
QSignalMapper *signalMapper;
private slots:
void buttonGeneric(QPushButton &button);
signals:
void clicked(QPushButton &button);
signalMapper = new QSignalMapper(this);
for (int i = 0; i < 100; ++i)
{
QPushButton *button = new QPushButton(QString::number(i + 1));
connect(button, SIGNAL(clicked()), signalMapper, SLOT(map()));
signalMapper->setMapping(button, button);
ui->gridLayout->addWidget(button, 2 + (i / 10), (i % 10));
}
connect(signalMapper, SIGNAL(mapped(QPushButton &button)), this, SIGNAL(clicked(QPushButton &button)));
connect(this, SIGNAL(clicked(QPushButton &button)), this, SLOT(buttonGeneric(QPushButton &button)));
void dialog::buttonGeneric(QPushButton & button)
{
button.setText("hello");
}
在.cpp文件中的“dialog”类的构造函数中,我有:
private:
QSignalMapper *signalMapper;
private slots:
void buttonGeneric(QPushButton &button);
signals:
void clicked(QPushButton &button);
signalMapper = new QSignalMapper(this);
for (int i = 0; i < 100; ++i)
{
QPushButton *button = new QPushButton(QString::number(i + 1));
connect(button, SIGNAL(clicked()), signalMapper, SLOT(map()));
signalMapper->setMapping(button, button);
ui->gridLayout->addWidget(button, 2 + (i / 10), (i % 10));
}
connect(signalMapper, SIGNAL(mapped(QPushButton &button)), this, SIGNAL(clicked(QPushButton &button)));
connect(this, SIGNAL(clicked(QPushButton &button)), this, SLOT(buttonGeneric(QPushButton &button)));
void dialog::buttonGeneric(QPushButton & button)
{
button.setText("hello");
}
这段代码编译并运行,但当我单击按钮时,什么也没有发生。在应用程序调试输出中,我得到以下结果:
QObject::connect: No such signal QSignalMapper::mapped(QPushButton &button)
QObject::connect: (receiver name: 'dialog')
QObject::connect: No such signal dialog::clicked(QPushButton &button)
QObject::connect: (sender name: 'dialog')
QObject::connect: (receiver name: 'dialog')
因此,我再次尝试将单击按钮的文本更改为新的内容。
我该怎么做
提前谢谢。
QSignalMapper
没有映射的信号(QPushButton&)
。它确实有映射(QWidget*)
,但是,它是为您的按钮发出的。因此,您应该连接到此信号(并相应地修改对话框信号和插槽)。但是,如果我像您建议的那样将QWidget作为参数传递,那么我将如何访问QPushButton的文本属性?QWidget没有“setText()”方法。@user1545986您可以使用qobject\u cast
,或者如果您确定对象始终是您期望的类型,static\u cast
。