connect(ui->radioButton_4,SIGNAL(clicked(bool)),SLOT(onClicked())); 4、实现槽函数。 void Widget::onClicked() { QPushButton* button = qobject_cast<QPushButton*>(sender()); QRadioButton* radio = qobject_cast<QRadioButton*>(sender()); if (button) { QString text = button->text(...
connect(ui->radioButton_4,SIGNAL(clicked(bool)),SLOT(onClicked())); 4、实现槽函数。 [cpp] void Widget::onClicked() { QPushButton* button = qobject_cast<QPushButton*>(sender()); QRadioButton* radio = qobject_cast<QRadioButton*>(sender()); if (button) { QString text =...
1.sender()函数 QPushButton *button_tmp=qobject_cast<QPushButton *>(sender()); 当某一个Object emit一个signal的时候,它就是一个sender,系统会记录下当前是谁emit出这个signal的,所以你在对应的slot里就可以通过 sender()得到当前是谁invoke了你的slot,对应的是QObject->d->sender. 2.通过QWidget * Q...
在某些情况下代码的重复性很高,需要简化代码写法,可以把每个信号连接到同一个槽,然后在槽函数中通过qobject_cast<;>(sender())获取发出信号的对象名。再进行相应的判断和...* button =qobject_cast<;QPushButton*>(sender()); QRadioButton* radio =qobject_cast< ...
QObject::connect(showPageSetupDialogButton, SIGNAL(clicked()),this, SLOT( buttonsClicked())); // Initialize. setWindowTitle(QObject::tr("Builtin Dialogs")); } voidBuiltinDialog::buttonsClicked() { QPushButton *button = qobject_cast<QPushButton *> (sender()); ...
有可能多个 Object的signal会连接到同一个signal(例如多个Button可能会connect到一个slot函数onClick()),因此这是就 需要判断到底是哪个Object emit了这个signal,根据sender的不同来进行不同的处理. 在槽函数中: QObject * obj = sender(); //返回发出信号的对象,用QObject类型接收 QPushButton *button_tmp = ...
QPushButton *button = qobject_cast<QPushButton *> (sender()); if(button == showFileDialogButton) { QString fileName = QFileDialog::getOpenFileName(this, QObject::tr( "Open File"), QDir::home().path(), QObject::tr( "Images(*.png *.jpg *.gif)")); ...
QObject::connect( btn, &QPushButton::clicked,this, &MyClass::onClicked );voidMyClass::onClicked(){// How to get pointer to a button:QObject *p =sender();// It's QObject. Now we need to cast it to button:QPushButton *btn =qobject_cast<QPushButon *>( p );Q_ASSERT( btn...
Qt: qobject_cast<QPushButton*>(sender()) 简化信号与槽的编写,当你觉得写代码是一件重复性极高的工作时,这时你就应该考虑换个方式来实现了。提高代码效率,减少代码量。
QObject::connect(showPageSetupDialogButton, SIGNAL(clicked()),this, SLOT( buttonsClicked())); // Initialize. setWindowTitle(QObject::tr("Builtin Dialogs")); } voidBuiltinDialog::buttonsClicked() { QPushButton *button = qobject_cast<QPushButton *> (sender()); ...