//mainwin.h class MainWin : public QWidget { Q_OBJECT public: MainWin(QWidget *parent = 0); private slots: void doClicked(const QString & btnname);//處理最終信號的槽 private: QSignalMapper *signalMapper; }; //mainwin.cpp MainWin::MainWin(QStringList texts, QWidget *parent) : QWidget(parent) { QString buttontext = "btn1,btn2,btn3,btn4,btn5,btn6,btn7,btn8,btn9,btn10";//10個button QStringList texts = buttontext.split(","); signalMapper = new QSignalMapper(this); QGridLayout *gridLayout = new QGridLayout; for (int i = 0; i < texts.size(); ++i) { QPushButton *button = new QPushButton(texts[i]); connect(button, SIGNAL(clicked()), signalMapper, SLOT(map ())); //原始信號傳遞給signalmapper signalMapper->setMapping (button, texts[i]); //設置signalmapper的轉發規則, 轉發爲參數爲QString類型的信號, // 並把texts[i]的內容作爲實參傳遞。 gridLayout->addWidget(button, i / 3, i % 3); } connect(signalMapper, SIGNAL(mapped (const QString &)), this, SLOT(doClicked(const QString &)));//將轉發的信號連接到最終的槽函數 setLayout(gridLayout); } void MainWin::doClicked(const QString& btnname) { QMessageBox::information(this, "Clicked", btnname + " is clicked!");//顯示被按下的btn名稱。 }
*其次調用setMapper方法告訴signalmapper怎樣去處理原始信號。 在這個例子中是把原始信號轉化爲一個帶QString參數的信號
*最後接收轉化後的帶參數信號, 這裏所把轉化後的信號與槽函數連接, 在槽函數中獲得需要的數據。
//主類從QMainWindow派生 MainWindow::MainWindow() { //... windowMapper = new QSignalMapper(this); connect(windowMapper, SIGNAL(mapped (QWidget *)), this, SLOT(setActiveSubWindow(QWidget *))); //轉發的信號直接連接到QMainWindow的setActiveSubWindow槽 //... } void MainWindow::updateWindowMenu() { //... QList windows = mdiArea->subWindowList(); separatorAct->setVisible(!windows.isEmpty()); for (int i = 0; i < windows.size(); ++i) { MdiChild *child = qobject_cast(windows.at(i)->widget()); QString text; if (i < 9) { text = tr("&%1 %2").arg(i + 1) .arg(child->userFriendlyCurrentFile()); } else { text = tr("%1 %2").arg(i + 1).arg(child->userFriendlyCurrentFile()); } QAction *action = windowMenu->addAction(text); action->setCheckable(true); action ->setChecked(child == activeMdiChild()); connect(action, SIGNAL(triggered()), windowMapper, SLOT(map ()));//監控action的triggered信號 windowMapper->setMapping (action, windows.at(i));//建立action指針到QWidget*的映射 //... }