Qt5.9中获取QButtonGroup被选中按钮QPushbutton的ObjectName用法

本文主要总结获取QButtonGroup被选中按钮QPushbutton的ObjectName用法。

要在按钮组QButtonGroup获取被选中按钮的ObjectName，只需要用到一个函数T qobject_cast ( QObject * object )，其中object的目标是被选中按钮（用函数QButtonGroup::checkedButton()可以实现）。函数qobject_cast的主要功能是获取被选中按钮的对象入口地址，可以通过该入口地址直接操作被选中按钮，比如可以获取对象的objectName。

实现步骤：（QButtonGroup有触发信号，可以判断哪个按钮被选中）

a1.将QButtonGroup的对象buttonGroup实例为全局变量，然后添加几个QPushbutton按钮；

a2.通过connect(buttonGroup,SIGNAL(buttonClicked(int)),this,SLOT(buttonGroupSlot(int)))绑定buttonGroup的触发信号和槽函数；

a3.然后在槽函数中添加如下语句，就可以获取QButtonGroup中被选中按钮的objectName。

    QPushButton* pbtn = qobject_cast<QPushButton*>(buttonGroup->checkedButton());
    qDebug()<<pbtn->objectName();

具体的实例工程代码如下所述：

1.1新建一个widget工程，不要勾选ui界面。然后分别在widget.h，widget.cpp，main.cpp分别添加如下代码。

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QPushButton>
#include <QButtonGroup>

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = 0);
    ~Widget();

private:
    void setupUI();

    QButtonGroup *buttonGroup;

private slots:
    void on_changeButtonGroup(int);
};

#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QDebug>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    //窗口UI界面初始化
    setupUI();
}

Widget::~Widget()
{    
}

void Widget::setupUI()
{    
    QPushButton *button1 = new QPushButton("button1");
    button1->setObjectName("button1");
    button1->setCheckable(true);
    QPushButton *button2 = new QPushButton("button2");
    button2->setObjectName("button2");
    button2->setCheckable(true);
    QPushButton *button3 = new QPushButton("button3");
    button3->setObjectName("button3");
    button3->setCheckable(true);

    buttonGroup = new QButtonGroup;
    buttonGroup->addButton(button1);
    buttonGroup->addButton(button2);
    buttonGroup->addButton(button3);
    buttonGroup->setExclusive(true);
    connect(buttonGroup,SIGNAL(buttonClicked(int)),this,SLOT(on_changeButtonGroup(int)));

    QHBoxLayout *topLayout = new QHBoxLayout();
    topLayout->setMargin(0);
    topLayout->setSpacing(0);
    topLayout->addWidget(button1);
    topLayout->addWidget(button2);
    topLayout->addWidget(button3);
    topLayout->addStretch();

    QVBoxLayout *mainLayout = new QVBoxLayout();
    mainLayout->setMargin(0);
    mainLayout->setSpacing(0);
    mainLayout->addLayout(topLayout);
    mainLayout->addStretch();
    this->setLayout(mainLayout);
}

void Widget::on_changeButtonGroup(int)
{
    QPushButton *checkedButton = qobject_cast<QPushButton*>(buttonGroup->checkedButton());
    QString checkedBtnObjectName = checkedButton->objectName();
    qDebug()<<tr("被选中按钮的objectName==%1").arg(checkedBtnObjectName);
}

main.cpp

#include "widget.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.resize(960,640);
    w.setWindowTitle(QString::fromUtf8("获取QButtonGroup被选中按钮的objectName"));
    w.show();

    return a.exec();
}

1.2程序构建和运行后，结果如下图所示：

参考内容：

https://www.cnblogs.com/findumars/p/6025106.html（主要参考）

http://www.bubuko.com/infodetail-1819822.html

Qt5.9中获取QButtonGroup被选中按钮QPushbutton的ObjectName用法

猜你喜欢