【Qt入门教程06】官方入门教程|番外篇

～风介～ · 发表于 2014-12-9 23:57:40

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本帖最后由～风介～于 2015-11-20 19:58 编辑

code one：

//main.cpp
#include <QtWidgets>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QTextEdit textEdit;
textEdit.show();
return app.exec();
}

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code two：

//main.cpp
#include <QtWidgets>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QTextEdit *textEdit = new QTextEdit;
QPushButton *quitButton = new QPushButton("&Quit");
QObject::connect(quitButton, SIGNAL(clicked()), qApp, SLOT(quit()));
QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(textEdit);
layout->addWidget(quitButton);
QWidget window;
window.setLayout(layout);
window.show();
return app.exec();
}

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code three：

//main.cpp
#include <QtWidgets>
class Notepad : public QWidget
{
Q_OBJECT
public:
Notepad();
private slots:
void quit();
private:
QTextEdit *textEdit;
QPushButton *quitButton;
};
Notepad::Notepad()
{
textEdit = new QTextEdit;
quitButton = new QPushButton(tr("Quit"));
connect(quitButton, SIGNAL(clicked()), this, SLOT(quit()));
QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(textEdit);
layout->addWidget(quitButton);
setLayout(layout);
setWindowTitle(tr("Notepad"));
}
void Notepad::quit()
{
QMessageBox messageBox;
messageBox.setWindowTitle(tr("Notepad"));
messageBox.setText(tr("Do you really want to quit?"));
messageBox.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
messageBox.setDefaultButton(QMessageBox::No);
if (messageBox.exec() == QMessageBox::Yes)
qApp->quit();
}
int main(int argc, char **argv)
{
QApplication app(argc, argv);
Notepad notepad;
notepad.show();
return app.exec();
}

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code four:

//main.cpp
#include <QtWidgets>
class Notepad : public QMainWindow
{
Q_OBJECT
public:
Notepad();
private slots:
void load();
void save();
private:
QTextEdit *textEdit;
QAction *loadAction;
QAction *saveAction;
QAction *exitAction;
QMenu *fileMenu;
};
Notepad::Notepad()
{
loadAction = new QAction(tr("&Load"), this);
saveAction = new QAction(tr("&Save"), this);
exitAction = new QAction(tr("E&xit"), this);
connect(loadAction, SIGNAL(triggered()), this, SLOT(load()));
connect(saveAction, SIGNAL(triggered()), this, SLOT(save()));
connect(exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
fileMenu = menuBar()->addMenu(tr("&File"));
fileMenu->addAction(loadAction);
fileMenu->addAction(saveAction);
fileMenu->addSeparator();
fileMenu->addAction(exitAction);
textEdit = new QTextEdit;
setCentralWidget(textEdit);
setWindowTitle(tr("Notepad"));
}
void Notepad::load()
{
}
void Notepad::save()
{
}
int main(int argc, char **argv)
{
QApplication app(argc, argv);
Notepad notepad;
notepad.show();
return app.exec();
};

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code five:

//main.cpp
#include <QtWidgets>
class Notepad : public QMainWindow
{
Q_OBJECT
public:
Notepad();
private slots:
void open();
void save();
private:
QTextEdit *textEdit;
QAction *openAction;
QAction *saveAction;
QAction *exitAction;
QMenu *fileMenu;
};
Notepad::Notepad()
{
openAction = new QAction(tr("&Load"), this);
saveAction = new QAction(tr("&Save"), this);
exitAction = new QAction(tr("E&xit"), this);
connect(openAction, SIGNAL(triggered()), this, SLOT(open()));
connect(saveAction, SIGNAL(triggered()), this, SLOT(save()));
connect(exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
fileMenu = menuBar()->addMenu(tr("&File"));
fileMenu->addAction(openAction);
fileMenu->addAction(saveAction);
fileMenu->addSeparator();
fileMenu->addAction(exitAction);
textEdit = new QTextEdit;
setCentralWidget(textEdit);
setWindowTitle(tr("Notepad"));
}
void Notepad::open()
{
QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"), "",
tr("Text Files (*.txt);;C++ Files (*.cpp *.h)"));
if (!fileName.isEmpty()) {
QFile file(fileName);
if (!file.open(QIODevice::ReadOnly)) {
QMessageBox::critical(this, tr("Error"), tr("Could not open file"));
return;
}
QTextStream in(&file);
textEdit->setText(in.readAll());
file.close();
}
}
void Notepad::save()
{
QString fileName = QFileDialog::getSaveFileName(this, tr("Save File"), "",
tr("Text Files (*.txt);;C++ Files (*.cpp *.h)"));
if (!fileName.isEmpty()) {
QFile file(fileName);
if (!file.open(QIODevice::WriteOnly)) {
// error message
} else {
QTextStream stream(&file);
stream << textEdit->toPlainText();
stream.flush();
file.close();
}
}
}
int main(int argc, char **argv)
{
QApplication app(argc, argv);
Notepad notepad;
notepad.show();
return app.exec();
}

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