notepad.cpp

我用QT写的记事本程序

#include "notepad.h"
#include <QtGui/QWidget>
#include <QtGui/QMessageBox>
#include <QtGui/QFileDialog>

notepad::notepad(QWidget *parent, Qt::WFlags flags)
: QMainWindow(parent, flags)
{
	ui.setupUi(this);
	notecontent = new noteContent;
	setCentralWidget(notecontent);	
	createActions();
	createMenus();
	setWindowIcon(QIcon(":/images/icon.png"));
}

notepad::~notepad()
{

}

bool notepad::okToContinue()
{
	if (notecontent->isModified()) 
	{
		int r = QMessageBox::warning(this, tr("notecontent"),
			tr("The document has been modified.\n"
			"Do you want to save your changes?"),
			QMessageBox::Yes | QMessageBox::No
			| QMessageBox::Cancel);
		if (r == QMessageBox::Yes) 
		{
			return save();
		}
		else if (r == QMessageBox::Cancel) 
		{
			return false;
		}
	}
	return true;
}

bool notepad::save()
{
	if (curFile.isEmpty()) 
	{
		return saveAs();
	} 
	else 
	{
		return saveFile(curFile);
	}
}
bool notepad::saveAs()
{
	QString fileName = QFileDialog::getSaveFileName(this,
		tr("Save notecontent"), ".",
		tr("notecontent files (*.nc)"));
	if (fileName.isEmpty())
		return false;

	return saveFile(fileName);
}
void notepad::open()
{
	if (okToContinue()) {
		QString fileName = QFileDialog::getOpenFileName(this,
			tr("Open Spreadsheet"), ".",
			tr("Spreadsheet files (*.nc)"));
		if (!fileName.isEmpty())
			loadFile(fileName);
	}
}
bool notepad::saveFile(const QString &fileName)
{
	if (!notecontent->writeFile(fileName)) 
		{
			statusBar()->showMessage(tr("Saving canceled"), 2000);
			return false;
		}

	//setCurrentFile(fileName);
	statusBar()->showMessage(tr("File saved"), 2000);
	return true;
}
bool notepad::loadFile(const QString &fileName)
{
	if (!notecontent->readFile(fileName)) 
	{
		statusBar()->showMessage(tr("Loading canceled"), 2000);
		return false;
	}

	//setCurrentFile(fileName);
	statusBar()->showMessage(tr("File loaded"), 2000);
	return true;
}
void notepad::newFile()
{
	if (okToContinue())
	{
	notecontent->clear();
	//setCurrentFile("");
	}
}
void notepad::createActions()
{
	newAction = new QAction(tr("&New"),this);
	newAction->setIcon(QIcon(":/images/new.png"));
	newAction->setShortcut(QKeySequence::New);
	newAction->setStatusTip(tr("Create a new spreadsheet file"));
	connect(newAction,SIGNAL(triggered()),this,SLOT(newFile()));

	openAction = new QAction(tr("&Open..."), this);
	openAction->setIcon(QIcon(":/images/open.png"));
	openAction->setShortcut(QKeySequence::Open);
	openAction->setStatusTip(tr("Open an existing spreadsheet file"));
	connect(openAction, SIGNAL(triggered()), this, SLOT(open()));

	saveAction = new QAction(tr("&Save"), this);
	saveAction->setIcon(QIcon(":/images/save.png"));
	saveAction->setShortcut(QKeySequence::Save);
	saveAction->setStatusTip(tr("Save the spreadsheet to disk"));
	connect(saveAction, SIGNAL(triggered()), this, SLOT(save()));

	saveAsAction = new QAction(tr("Save &As..."), this);
	saveAsAction->setStatusTip(tr("Save the spreadsheet under a new "
		"name"));
	connect(saveAsAction, SIGNAL(triggered()), this, SLOT(saveAs()));

	exitAction = new QAction(tr("E&xit"), this);
	exitAction->setShortcut(tr("Ctrl+Q"));
	exitAction->setStatusTip(tr("Exit the application"));
	connect(exitAction, SIGNAL(triggered()), this, SLOT(close()));

	cutAction = new QAction(tr("Cu&t"), this);
	cutAction->setIcon(QIcon(":/images/cut.png"));
	cutAction->setShortcut(QKeySequence::Cut);
	cutAction->setStatusTip(tr("Cut the current selection's contents "
		"to the clipboard"));
	connect(cutAction, SIGNAL(triggered()), notecontent, SLOT(cut()));

	copyAction = new QAction(tr("&Copy"), this);
	copyAction->setIcon(QIcon(":/images/copy.png"));
	copyAction->setShortcut(QKeySequence::Copy);
	copyAction->setStatusTip(tr("Copy the current selection's contents "
		"to the clipboard"));
	connect(copyAction, SIGNAL(triggered()), notecontent, SLOT(copy()));

	pasteAction = new QAction(tr("&Paste"), this);
	pasteAction->setIcon(QIcon(":/images/paste.png"));
	pasteAction->setShortcut(QKeySequence::Paste);
	pasteAction->setStatusTip(tr("Paste the clipboard's contents into "
		"the current selection"));
	connect(pasteAction, SIGNAL(triggered()),
		notecontent, SLOT(paste()));

	deleteAction = new QAction(tr("&Delete"), this);
	deleteAction->setShortcut(QKeySequence::Delete);
	deleteAction->setStatusTip(tr("Delete the current selection's "
		"contents"));
	connect(deleteAction, SIGNAL(triggered()),
		notecontent, SLOT(del()));

	fontAction = new QAction(tr("&Font"), this);
	fontAction->setStatusTip(tr("Set the font format"));
	connect(fontAction, SIGNAL(triggered()),
		this, SLOT(close()));
}

void notepad::createMenus()
{
	fileMenu = menuBar()->addMenu(tr("&File"));
	fileMenu->addAction(newAction);
	fileMenu->addAction(openAction);
	fileMenu->addAction(saveAction);
	fileMenu->addAction(saveAsAction);
	fileMenu->addSeparator();
	fileMenu->addAction(exitAction);

	editMenu = menuBar()->addMenu(tr("&Edit"));
	editMenu->addAction(cutAction);
	editMenu->addAction(copyAction);
	editMenu->addAction(pasteAction);
	editMenu->addAction(deleteAction);

	formatMenu = menuBar()->addMenu(tr("F&ormat"));
	formatMenu->addAction(fontAction);

	viewMenu = menuBar()->addMenu(tr("V&iew"));

	helpMenu = menuBar()->addMenu(tr("H&elp"));
}