学步园

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);

}