QSignalMapper的使用

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QSignalMapper的使用

1. 可以吧无参数的信号转换为带int参数、带QString参数、带QObject参数、带QWidget参数的信号，

假如Qwidget上有许多Button，如果一一建立信号槽，显得繁琐，这时我们可以使用QSignalMapper

#include "MainWindow.h"#include "ui_MainWindow.h"#include <QHBoxLayout>#include <QVBoxLayout>#include <QString>#include <QStringList>#include <QGridLayout>#include <QPushButton>#include <QLineEdit>#include <QSignalMapper>MainWindow::MainWindow(QWidget *parent) :    QMainWindow(parent),    ui(new Ui::MainWindow){    ui->setupUi(this);    init();}MainWindow::~MainWindow(){    delete ui;}void MainWindow::init(){    QGridLayout *pLayout = new QGridLayout();    this->centralWidget()->setLayout(pLayout);    QString str = "Button1,Button2,Button3,Button4,Button5,Button6,Button7,Button8";    QStringList strList = str.split(",");    QSignalMapper *pMapper = new QSignalMapper();    for (int i = 0; i < strList.length(); ++i)    {        QPushButton *pBtn = new QPushButton;        pBtn->setText(strList.at(i));        connect(pBtn, SIGNAL(clicked()), pMapper, SLOT(map()));         pMapper->setMapping(pBtn, pBtn->text());        pLayout->addWidget(pBtn, i, 0);    }    QLineEdit *pEdit = new QLineEdit();    connect(pMapper, SIGNAL(mapped(QString)), pEdit, SLOT(setText(QString)));    pLayout->addWidget(pEdit, 0, 1);}

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