QSignalMapper使用入门

该类收集一组无参数信号，并使用与发送信号的对象对应的整数、字符串或小部件参数重新发射它们。注意，在大多数情况下，您可以使用lambda将自定义参数传递给插槽。这是较低的成本，并将简化代码。

类支持特定字符串、整数、对象和小部件与特定对象的映射。
QSignalMapper我们可以理解为转发器，此话怎讲呢？比如，按钮点击的响应槽，绑定到QSignalMapper上，QSignalMapper收到按钮的点击后，又通知到另外的控件上做处理。

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QVBoxLayout>
#include <QSignalMapper>
#include <QLineEdit>
#include <QPushButton>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QSignalMapper *pMapper = new QSignalMapper(this);

    QString str = "Button1 Button2 Button3 Button4 Button5";
    QStringList strList = str.split(" ");

    QVBoxLayout *pLayout = new QVBoxLayout(this);
    int nRowCnt = 0;
    foreach(const auto& it, strList){
        QPushButton *pBtn = new QPushButton(this);
        pBtn->setText(it);

        connect(pBtn, SIGNAL(clicked()), pMapper, SLOT(map()));
        pMapper->setMapping(pBtn, pBtn->text()+"test");
        pLayout->addWidget(pBtn);
        pBtn->move(10,nRowCnt++*30);
    }

    QLineEdit *pEdit = new QLineEdit(this);
    pEdit->move(10,nRowCnt++*30);
    connect(pMapper, SIGNAL(mapped(QString)), pEdit, SLOT(setText(QString)));
    pLayout->addWidget(pEdit);
    pLayout->addStretch();
    setLayout(pLayout);
}

MainWindow::~MainWindow()
{
    delete ui;
}

另外可以用：

（pushButton动态生成的话，可以放容器里，如QList<QPushButton*> lst;）

connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(clicked()));
    connect(ui->pushButton_2, SIGNAL(clicked()), this, SLOT(clicked()));
    connect(ui->pushButton_3, SIGNAL(clicked()), this, SLOT(clicked()));
    ui->pushButton->setWhatsThis("b1");
    ui->pushButton_2->setWhatsThis("b2");
    ui->pushButton_3->setWhatsThis("b3");
    ui->pushButton->setProperty("ttt","IamSoPoor");
    ui->pushButton_2->setProperty("ttt","11");
    ui->pushButton_3->setProperty("ttt","22");

    void MainWindow::clicked()
    {
        auto obj = qobject_cast<QPushButton *>(sender());
        qDebug()<<obj->text();
        qDebug()<<obj->whatsThis();
        qDebug()<<obj->property("ttt").toString();
    }
    void MainWindow::checkboxClicked(bool checked)
    {
        connect(ui->checkBox1, SIGNAL(clicked(bool)), this, SLOT(checkboxClicked(bool)));
        connect(ui->checkBox2, SIGNAL(clicked(bool)), this, SLOT(checkboxClicked(bool)));
        connect(ui->checkBox3, SIGNAL(clicked(bool)), this, SLOT(checkboxClicked(bool)));
        connect(ui->checkBox4, SIGNAL(clicked(bool)), this, SLOT(checkboxClicked(bool)));
        connect(ui->checkBox5, SIGNAL(clicked(bool)), this, SLOT(checkboxClicked(bool)));
        connect(ui->checkBox6, SIGNAL(clicked(bool)), this, SLOT(checkboxClicked(bool)));
        grp = new QButtonGroup(this);
        grp->addButton(ui->checkBox1,0);
        grp->addButton(ui->checkBox2,1);
        grp->addButton(ui->checkBox3,2);
        grp->addButton(ui->checkBox4,3);
        grp->addButton(ui->checkBox5,4);
        grp->addButton(ui->checkBox6,5);
        auto checkBox = qobject_cast<QCheckBox*>(sender());
        int id = grp->checkedId();
        qDebug()<<"tt"<<checked<<checkBox->objectName()<<id;//checkBox1,whatisthis,property()
        QString str = grp->checkedButton()->text();   
    }

​

链接：https://pan.baidu.com/s/11BdAJX3dZqIghdWIsX0l5Q
提取码：l3a8