Qt: 多文档应用程序源码解析及下载
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效果图如下：
项目结构：
程序主要功能：
1、新建文本文件。
2、多文档编辑文本文件。
3、打开已有文件。
4、文件另存为。
解析：
1、 Editor 类继承自 QTextEdit，主要用于文本编辑和处理功能。
2、MainWindow继承自QMainWindow，主要用于创建主界面，界面布局等功能。
源码：
//main.cpp
#include <QApplication>#include "mainwindow.h"int main(int argc, char *argv[]){ QApplication app(argc, argv); MainWindow mainWin; //创建一个程序实例 mainWin.show(); return app.exec();}//Editor.h
#ifndef EDITOR_H#define EDITOR_H#include <QTextEdit>class Editor : public QTextEdit{ Q_OBJECTpublic: Editor(QWidget *parent = 0); void newFile(); //新建文件 bool save(); //文件保存 bool saveAs(); //文件另存为 QSize sizeHint() const; //获取窗口的推荐大小 QAction *windowMenuAction() const { return action; } static Editor *open(QWidget *parent = 0); //打开窗口 static Editor *openFile(const QString &fileName, QWidget *parent = 0); //打开文件protected: void closeEvent(QCloseEvent *event); //关闭事件，在程序关闭之前执行此函数private slots: void documentWasModified(); //设置窗口显示状态，修改和未修改两种private: bool okToContinue(); bool saveFile(const QString &fileName); //保存文件 void setCurrentFile(const QString &fileName); //设置当前文件 bool readFile(const QString &fileName); //读文件 bool writeFile(const QString &fileName); //写文件 QString strippedName(const QString &fullFileName); //从文件路径中剥取文件名 QString curFile; bool isUntitled; QAction *action;};#endif//Editor.cpp
#include <QApplication>#include <QtGui>#include <QAction>#include <QMessageBox>#include <QFileDialog>#include "editor.h"Editor::Editor(QWidget *parent) : QTextEdit(parent){ action = new QAction(this); action->setCheckable(true); connect(action, SIGNAL(triggered()), this, SLOT(show())); connect(action, SIGNAL(triggered()), this, SLOT(setFocus())); isUntitled = true; //记录文件是否已经存在 connect(document(), SIGNAL(contentsChanged()), this, SLOT(documentWasModified())); //文档内容发生改变时，触发槽 setWindowIcon(QPixmap(":/images/document.png")); //设置子窗口图标 setWindowTitle("[*]"); setAttribute(Qt::WA_DeleteOnClose); //窗口关闭的时候删除}void Editor::newFile(){ static int documentNumber = 1; //记录打开子窗口的个数 curFile = tr("document%1.txt").arg(documentNumber); setWindowTitle(curFile + "[*]"); action->setText(curFile); isUntitled = true; ++documentNumber;}bool Editor::save(){ if (isUntitled) return saveAs(); else return saveFile(curFile);}bool Editor::saveAs(){ QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"), curFile); if (fileName.isEmpty()) return false; return saveFile(fileName);}QSize Editor::sizeHint() const{ return QSize(72 * fontMetrics().width('x'), 25 * fontMetrics().lineSpacing());}Editor *Editor::open(QWidget *parent) //弹出“打开”打开窗口，获取路径和文件名{ QString fileName = QFileDialog::getOpenFileName(parent, tr("Open"), "."); if (fileName.isEmpty()) return 0; return openFile(fileName, parent);}Editor *Editor::openFile(const QString &fileName, QWidget *parent){ Editor *editor = new Editor(parent); if (editor->readFile(fileName)) { editor->setCurrentFile(fileName); return editor; } else { delete editor; return 0; }}void Editor::closeEvent(QCloseEvent *event) //关闭事件发生时{ if (okToContinue()) event->accept(); //接受关闭事件 else event->ignore(); //忽视关闭事件}void Editor::documentWasModified() //设置窗口为被修改状态{ setWindowModified(true);}bool Editor::okToContinue() //是否继续{ if (document()->isModified()) //判断文件是否被修改 { int r = QMessageBox::warning(this, tr("MDI Editor"), tr("File %1 has been modified.\n" "Do you want to save your changes?") .arg(strippedName(curFile)), QMessageBox::Yes | QMessageBox::No | QMessageBox::Cancel); if (r == QMessageBox::Yes) { return save(); } else if (r == QMessageBox::Cancel) { return false; } } return true;}bool Editor::saveFile(const QString &fileName) //保存文件{ if (writeFile(fileName)) { setCurrentFile(fileName); return true; } else { return false; }}void Editor::setCurrentFile(const QString &fileName) //设置当前文件{ curFile = fileName; isUntitled = false; action->setText(strippedName(curFile)); document()->setModified(false); setWindowTitle(strippedName(curFile) + "[*]"); setWindowModified(false);}bool Editor::readFile(const QString &fileName) //读文件{ QFile file(fileName); if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) { QMessageBox::warning(this, tr("MDI Editor"), tr("Cannot read file %1:\n%2.") .arg(file.fileName()) .arg(file.errorString())); return false; } QTextStream in(&file); QApplication::setOverrideCursor(Qt::WaitCursor); setPlainText(in.readAll()); QApplication::restoreOverrideCursor(); return true;}bool Editor::writeFile(const QString &fileName) //写文件{ QFile file(fileName); if (!file.open(QIODevice::WriteOnly | QIODevice::Text)) { QMessageBox::warning(this, tr("MDI Editor"), tr("Cannot write file %1:\n%2.") .arg(file.fileName()) .arg(file.errorString())); return false; } QTextStream out(&file); QApplication::setOverrideCursor(Qt::WaitCursor); out << toPlainText(); QApplication::restoreOverrideCursor(); return true;}QString Editor::strippedName(const QString &fullFileName) //从路径中剥离文件名{ return QFileInfo(fullFileName).fileName();}//mainwindow.h
#ifndef MAINWINDOW_H#define MAINWINDOW_H#include <QMainWindow>class QAction;class QActionGroup;class QLabel;class QMdiArea;class QMenu;class QToolBar;class Editor;class MainWindow : public QMainWindow{ Q_OBJECTpublic: MainWindow();public slots: void newFile(); void openFile(const QString &fileName);protected: void closeEvent(QCloseEvent *event);private slots: void open(); void save(); void saveAs(); void cut(); void copy(); void paste(); void about(); void updateActions(); void loadFiles();private: void createActions(); void createMenus(); void createToolBars(); void createStatusBar(); void addEditor(Editor *editor); Editor *activeEditor(); QMdiArea *mdiArea; QLabel *readyLabel; QWidgetList windows; QMenu *fileMenu; QMenu *editMenu; QMenu *windowMenu; QMenu *helpMenu; QToolBar *fileToolBar; QToolBar *editToolBar; QActionGroup *windowActionGroup; QAction *newAction; QAction *openAction; QAction *saveAction; QAction *saveAsAction; QAction *exitAction; QAction *cutAction; QAction *copyAction; QAction *pasteAction; QAction *closeAction; QAction *closeAllAction; QAction *tileAction; QAction *cascadeAction; QAction *nextAction; QAction *previousAction; QAction *separatorAction; QAction *aboutAction; QAction *aboutQtAction;};#endif//mainwindow.cpp
#include <QToolBar>#include <QLabel>#include <QtGui>#include <QMdiArea>#include <QApplication>#include <QMessageBox>#include <QAction>#include <QMenuBar>#include <QStatusBar>#include <QMdiSubWindow>#include "editor.h"#include "mainwindow.h"MainWindow::MainWindow(){ mdiArea = new QMdiArea; setCentralWidget(mdiArea); connect(mdiArea, SIGNAL(subWindowActivated(QMdiSubWindow*)),this, SLOT(updateActions())); createActions(); createMenus(); createToolBars(); createStatusBar(); setWindowIcon(QPixmap(":/images/icon.png")); setWindowTitle(tr("MDI Editor")); QTimer::singleShot(0, this, SLOT(loadFiles()));}void MainWindow::loadFiles(){ QStringList args = QApplication::arguments(); args.removeFirst(); if (!args.isEmpty()) { foreach (QString arg, args) openFile(arg); mdiArea->cascadeSubWindows(); } else { newFile(); } mdiArea->activateNextSubWindow();}void MainWindow::newFile(){ Editor *editor = new Editor; editor->newFile(); addEditor(editor);}void MainWindow::openFile(const QString &fileName){ Editor *editor = Editor::openFile(fileName, this); if (editor) addEditor(editor);}void MainWindow::closeEvent(QCloseEvent *event){ mdiArea->closeAllSubWindows(); if (!mdiArea->subWindowList().isEmpty()) { event->ignore(); } else { event->accept(); }}void MainWindow::open(){ Editor *editor = Editor::open(this); if (editor) addEditor(editor);}void MainWindow::save(){ if (activeEditor()) activeEditor()->save();}void MainWindow::saveAs(){ if (activeEditor()) activeEditor()->saveAs();}void MainWindow::cut(){ if (activeEditor()) activeEditor()->cut();}void MainWindow::copy(){ if (activeEditor()) activeEditor()->copy();}void MainWindow::paste(){ if (activeEditor()) activeEditor()->paste();}void MainWindow::about(){ QMessageBox::about(this, tr("About MDI Editor"), tr("<h2>Editor 1.1</h2>" "<p>Copyright © 2007 Software Inc." "<p>MDI Editor is a small application that demonstrates " "QMdiArea."));}void MainWindow::updateActions(){ bool hasEditor = (activeEditor() != 0); bool hasSelection = activeEditor() && activeEditor()->textCursor().hasSelection(); saveAction->setEnabled(hasEditor); saveAsAction->setEnabled(hasEditor); cutAction->setEnabled(hasSelection); copyAction->setEnabled(hasSelection); pasteAction->setEnabled(hasEditor); closeAction->setEnabled(hasEditor); closeAllAction->setEnabled(hasEditor); tileAction->setEnabled(hasEditor); cascadeAction->setEnabled(hasEditor); nextAction->setEnabled(hasEditor); previousAction->setEnabled(hasEditor); separatorAction->setVisible(hasEditor); if (activeEditor()) activeEditor()->windowMenuAction()->setChecked(true);}void MainWindow::createActions(){ newAction = new QAction(tr("&New"), this); newAction->setIcon(QIcon(":/images/new.png")); newAction->setShortcut(QKeySequence::New); newAction->setStatusTip(tr("Create a new 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 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 file to disk")); connect(saveAction, SIGNAL(triggered()), this, SLOT(save())); saveAsAction = new QAction(tr("Save &As..."), this); saveAsAction->setStatusTip(tr("Save the file 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 to the " "clipboard")); connect(cutAction, SIGNAL(triggered()), this, 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 to the " "clipboard")); connect(copyAction, SIGNAL(triggered()), this, 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 at " "the cursor position")); connect(pasteAction, SIGNAL(triggered()), this, SLOT(paste())); closeAction = new QAction(tr("Cl&ose"), this); closeAction->setShortcut(QKeySequence::Close); closeAction->setStatusTip(tr("Close the active window")); connect(closeAction, SIGNAL(triggered()), mdiArea, SLOT(closeActiveSubWindow())); closeAllAction = new QAction(tr("Close &All"), this); closeAllAction->setStatusTip(tr("Close all the windows")); connect(closeAllAction, SIGNAL(triggered()), this, SLOT(close())); tileAction = new QAction(tr("&Tile"), this); tileAction->setStatusTip(tr("Tile the windows")); connect(tileAction, SIGNAL(triggered()), mdiArea, SLOT(tileSubWindows())); cascadeAction = new QAction(tr("&Cascade"), this); cascadeAction->setStatusTip(tr("Cascade the windows")); connect(cascadeAction, SIGNAL(triggered()), mdiArea, SLOT(cascadeSubWindows())); nextAction = new QAction(tr("Ne&xt"), this); nextAction->setShortcut(QKeySequence::NextChild); nextAction->setStatusTip(tr("Move the focus to the next window")); connect(nextAction, SIGNAL(triggered()), mdiArea, SLOT(activateNextSubWindow())); previousAction = new QAction(tr("Pre&vious"), this); previousAction->setShortcut(QKeySequence::PreviousChild); previousAction->setStatusTip(tr("Move the focus to the previous " "window")); connect(previousAction, SIGNAL(triggered()),mdiArea, SLOT(activatePreviousSubWindow())); separatorAction = new QAction(this); separatorAction->setSeparator(true); aboutAction = new QAction(tr("&About"), this); aboutAction->setStatusTip(tr("Show the application's About box")); connect(aboutAction, SIGNAL(triggered()), this, SLOT(about())); aboutQtAction = new QAction(tr("About &Qt"), this); aboutQtAction->setStatusTip(tr("Show the Qt library's About box")); connect(aboutQtAction, SIGNAL(triggered()), qApp, SLOT(aboutQt())); windowActionGroup = new QActionGroup(this);}void MainWindow::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); windowMenu = menuBar()->addMenu(tr("&Window")); windowMenu->addAction(closeAction); windowMenu->addAction(closeAllAction); windowMenu->addSeparator(); windowMenu->addAction(tileAction); windowMenu->addAction(cascadeAction); windowMenu->addSeparator(); windowMenu->addAction(nextAction); windowMenu->addAction(previousAction); windowMenu->addAction(separatorAction); menuBar()->addSeparator(); helpMenu = menuBar()->addMenu(tr("&Help")); helpMenu->addAction(aboutAction); helpMenu->addAction(aboutQtAction);}void MainWindow::createToolBars(){ fileToolBar = addToolBar(tr("File")); fileToolBar->addAction(newAction); fileToolBar->addAction(openAction); fileToolBar->addAction(saveAction); editToolBar = addToolBar(tr("Edit")); editToolBar->addAction(cutAction); editToolBar->addAction(copyAction); editToolBar->addAction(pasteAction);}void MainWindow::createStatusBar(){ readyLabel = new QLabel(tr(" Ready")); statusBar()->addWidget(readyLabel, 1);}void MainWindow::addEditor(Editor *editor){ connect(editor, SIGNAL(copyAvailable(bool)), cutAction, SLOT(setEnabled(bool))); connect(editor, SIGNAL(copyAvailable(bool)), copyAction, SLOT(setEnabled(bool))); QMdiSubWindow *subWindow = mdiArea->addSubWindow(editor); windowMenu->addAction(editor->windowMenuAction()); windowActionGroup->addAction(editor->windowMenuAction()); subWindow->show();}Editor *MainWindow::activeEditor(){ QMdiSubWindow *subWindow = mdiArea->activeSubWindow(); if (subWindow) return qobject_cast<Editor *>(subWindow->widget()); return 0;}源码下载地址：
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