5.13 实例：带有菜单栏与工具条的文本编辑器.txt

qt的源代码

#ifndefMAINWINDOW_H
#defineMAINWINDOW_H
#include<QMainWindow>
class QAction;
 class QMenu;
 class QTextEdit;
 class MainWindow : public QMainWindow
 {
     Q_OBJECT
 public:
     MainWindow();
 protected:
     void closeEvent(QCloseEvent *event);
 private slots:
     void newFile();
     void open();
     bool save();
     bool saveAs();
     void about();
     void documentWasModified();
 private:
     void createActions();
     void createMenus();
     void createToolBars();
     void createStatusBar();
     void readSettings();
     void writeSettings();
     bool maybeSave();
     void loadFile(const QString &fileName);
     bool saveFile(const QString &fileName);
     void setCurrentFile(const QString &fileName);
     QString strippedName(const QString &fullFileName);
     QTextEdit *textEdit;
     QString curFile;
     QMenu *fileMenu;
     QMenu *editMenu;
     QMenu *helpMenu;
     QToolBar *fileToolBar;
     QToolBar *editToolBar;
     QAction *newAct;
     QAction *openAct;
     QAction *saveAct;
     QAction *saveAsAct;
     QAction *exitAct;
     QAction *cutAct;
     QAction *copyAct;
     QAction *pasteAct;
     QAction *aboutAct;
     QAction *aboutQtAct;
 };
 #endif
#include<QtGui>
#include"mainwindow.h"
MainWindow::MainWindow()
{
textEdit = new QTextEdit;
     setCentralWidget(textEdit);
     createActions();
     createMenus();
     createToolBars();
     createStatusBar();
readSettings();
connect(textEdit->document(), SIGNAL(contentsChanged()),
             this, SLOT(documentWasModified()));
     setCurrentFile("");
 }
void MainWindow::closeEvent(QCloseEvent *event)
 {
     if (maybeSave()) {
         writeSettings();
         event->accept();
     } else {
         event->ignore();
}
}
void MainWindow::newFile()
 {
     if (maybeSave()) {
         textEdit->clear();
         setCurrentFile("");
}
}
void MainWindow::open()
 {
     if (maybeSave()) {
         QString fileName = QFileDialog::getOpenFileName(this);
         if (!fileName.isEmpty())
             loadFile(fileName);
}
}
bool MainWindow::save()
 {
     if (curFile.isEmpty()) {
         return saveAs();
     } else {
         return saveFile(curFile);
     }
 }
 bool MainWindow::saveAs()
 {
     QString fileName = QFileDialog::getSaveFileName(this);
     if (fileName.isEmpty())
         return false;
     return saveFile(fileName);
 }
 void MainWindow::about()
{
QMessageBox::about(this, tr("About Application"),
             tr("The <b>Application</b> example demonstrates how to "
                "write modern GUI applications using Qt, with a menu bar, "
                "toolbars, and a status bar."));
}
void MainWindow::documentWasModified()
 {
     setWindowModified(textEdit->document()->isModified());
}
void MainWindow::createActions()
{
newAct = new QAction(QIcon(":/images/new.png"), tr("&New"), this);
     newAct->setShortcut(tr("Ctrl+N"));
     newAct->setStatusTip(tr("Create a new file"));
     connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));
     openAct = new QAction(QIcon(":/images/open.png"), tr("&Open..."), this);
     openAct->setShortcut(tr("Ctrl+O"));
     openAct->setStatusTip(tr("Open an existing file"));
     connect(openAct, SIGNAL(triggered()), this, SLOT(open()));
     saveAct = new QAction(QIcon(":/images/save.png"), tr("&Save"), this);
     saveAct->setShortcut(tr("Ctrl+S"));
     saveAct->setStatusTip(tr("Save the document to disk"));
     connect(saveAct, SIGNAL(triggered()), this, SLOT(save()));
     saveAsAct = new QAction(tr("Save &As..."), this);
     saveAsAct->setStatusTip(tr("Save the document under a new name"));
     connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));
     exitAct = new QAction(tr("E&xit"), this);
     exitAct->setShortcut(tr("Ctrl+Q"));
     exitAct->setStatusTip(tr("Exit the application"));
     connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));
     cutAct = new QAction(QIcon(":/images/cut.png"), tr("Cu&t"), this);
     cutAct->setShortcut(tr("Ctrl+X"));
     cutAct->setStatusTip(tr("Cut the current selection's contents to the "
                             "clipboard"));
     connect(cutAct, SIGNAL(triggered()), textEdit, SLOT(cut()));
     copyAct = new QAction(QIcon(":/images/copy.png"), tr("&Copy"), this);
     copyAct->setShortcut(tr("Ctrl+C"));
     copyAct->setStatusTip(tr("Copy the current selection's contents to the "
                              "clipboard"));
     connect(copyAct, SIGNAL(triggered()), textEdit, SLOT(copy()));
     pasteAct = new QAction(QIcon(":/images/paste.png"), tr("&Paste"), this);
     pasteAct->setShortcut(tr("Ctrl+V"));
     pasteAct->setStatusTip(tr("Paste the clipboard's contents into the current "
                               "selection"));
     connect(pasteAct, SIGNAL(triggered()), textEdit, SLOT(paste()));
     aboutAct = new QAction(tr("&About"), this);
     aboutAct->setStatusTip(tr("Show the application's About box"));
     connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
     aboutQtAct = new QAction(tr("About &Qt"), this);
     aboutQtAct->setStatusTip(tr("Show the Qt library's About box"));
     connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
     cutAct->setEnabled(false);
     copyAct->setEnabled(false);
     connect(textEdit, SIGNAL(copyAvailable(bool)),
             cutAct, SLOT(setEnabled(bool)));
     connect(textEdit, SIGNAL(copyAvailable(bool)),
             copyAct, SLOT(setEnabled(bool)));
}
void MainWindow::createMenus()
 {
     fileMenu = menuBar()->addMenu(tr("&File"));
     fileMenu->addAction(newAct);
     fileMenu->addAction(openAct);
     fileMenu->addAction(saveAct);
     fileMenu->addAction(saveAsAct);
fileMenu->addSeparator();
     fileMenu->addAction(exitAct);
     editMenu = menuBar()->addMenu(tr("&Edit"));
     editMenu->addAction(cutAct);
     editMenu->addAction(copyAct);
     editMenu->addAction(pasteAct);
     menuBar()->addSeparator();
     helpMenu = menuBar()->addMenu(tr("&Help"));
     helpMenu->addAction(aboutAct);
     helpMenu->addAction(aboutQtAct);
}
void MainWindow::createToolBars()
 {
     fileToolBar = addToolBar(tr("File"));
     fileToolBar->addAction(newAct);
     fileToolBar->addAction(openAct);
     fileToolBar->addAction(saveAct);
     editToolBar = addToolBar(tr("Edit"));
     editToolBar->addAction(cutAct);
     editToolBar->addAction(copyAct);
     editToolBar->addAction(pasteAct);
}
void MainWindow::createStatusBar()
 {
     statusBar()->showMessage(tr("Ready"));
 }
 void MainWindow::readSettings()
 {
     QSettings settings("Trolltech", "Application Example");
     QPoint pos = settings.value("pos", QPoint(200, 200)).toPoint();
     QSize size = settings.value("size", QSize(400, 400)).toSize();
     resize(size);
     move(pos);
 }
 void MainWindow::writeSettings()
 {
     QSettings settings("Trolltech", "Application Example");
     settings.setValue("pos", pos());
     settings.setValue("size", size());
}
bool MainWindow::maybeSave()
 {
     if (textEdit->document()->isModified()) {
         QMessageBox::StandardButton ret;
         ret = QMessageBox::warning(this, tr("Application"),
                      tr("The document has been modified.\n"
                         "Do you want to save your changes?"),
                      QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
         if (ret == QMessageBox::Save)
             return save();
         else if (ret == QMessageBox::Cancel)
             return false;
     }
     return true;
}
void MainWindow::loadFile(const QString &fileName)
 {
     QFile file(fileName);
     if (!file.open(QFile::ReadOnly | QFile::Text)) {
         QMessageBox::warning(this, tr("Application"),
                              tr("Cannot read file %1:\n%2.")
                              .arg(fileName)
                              .arg(file.errorString()));
         return;
     }
     QTextStream in(&file);
     QApplication::setOverrideCursor(Qt::WaitCursor);
     textEdit->setPlainText(in.readAll());
     QApplication::restoreOverrideCursor();
     setCurrentFile(fileName);
     statusBar()->showMessage(tr("File loaded"), 2000);
 }
bool MainWindow::saveFile(const QString &fileName)
 {
     QFile file(fileName);
     if (!file.open(QFile::WriteOnly | QFile::Text)) {
         QMessageBox::warning(this, tr("Application"),
                              tr("Cannot write file %1:\n%2.")
                              .arg(fileName)
                              .arg(file.errorString()));
         return false;
     }
     QTextStream out(&file);
     QApplication::setOverrideCursor(Qt::WaitCursor);
     out << textEdit->toPlainText();
     QApplication::restoreOverrideCursor();
     setCurrentFile(fileName);
     statusBar()->showMessage(tr("File saved"), 2000);
     return true;
}
void MainWindow::setCurrentFile(const QString &fileName)
 {
     curFile = fileName;
     textEdit->document()->setModified(false);
     setWindowModified(false);
     QString shownName;
     if (curFile.isEmpty())
         shownName = "untitled.txt";
     else
         shownName = strippedName(curFile);
     setWindowTitle(tr("%1[*] - %2").arg(shownName).arg(tr("Application")));
 }
 QString MainWindow::strippedName(const QString &fullFileName)
 {
     return QFileInfo(fullFileName).fileName();
 }
 #include <QApplication>
 #include "mainwindow.h"
 int main(int argc, char *argv[])
 {
     Q_INIT_RESOURCE(application);
     QApplication app(argc, argv);
     MainWindow mainWin;
     mainWin.show();
     return app.exec();
}