QT-利用C++仿制windown自带的记事本程序V1.0

　　下班无事, 发现QT还是很好用的, 就仿制windows的记事本做了一个,未彻底DEBUG, 先拿来分享下.

windows记事本大概是这样的:

大概分为以下几步:

1. 界面用QT代码写,即可, QT的布局很强大

 //create all actions

 void Notepad::createActions()

 {

     newAct = new QAction(tr("新建(&N)"), this);

     openAct = new QAction(tr("打开(&O)"), this);

     saveAct = new QAction(tr("保存(&S)"), this);

     saveAsAct = new QAction(tr("另存为(&A)..."), this);

     pageSetupAct = new QAction(tr("页面设置(&U)..."), this);

     printAct = new QAction(tr("打印(&P)..."), this);

     quitAct = new QAction(tr("退出(&Q)"), this);

     undoAct = new QAction(tr("撤消(&U)"), this);

     redoAct = new QAction(tr("重做(&R)"), this);

     cutAct = new QAction(tr("剪切(&T)"), this);

     copyAct = new QAction(tr("复制(&C)"), this);

     pasteAct = new QAction(tr("粘贴(&P)"), this);

     deleteAct = new QAction(tr("删除(&L)"), this);

     findAct = new QAction(tr("查找(&F)..."), this);

     findNextAct = new QAction(tr("查找下一个(&N)"), this);

     replaceAct = new QAction(tr("替换(&E)..."), this);

     gotoAct = new QAction(tr("转到(&G)..."), this);

     selectAllAct = new QAction(tr("全选(&A)"), this);

     timeAct = new QAction(tr("时间/日期(&D)"), this);

     autoNewLineAct = new QAction(tr("自动换行(&L)"), this);

     fontAct = new QAction(tr("字体(&F)..."), this);

     statusBarAct = new QAction(tr("状态栏(&S)"), this);

     viewHelpAct = new QAction(tr("查看帮助(&H)"), this);

     aboutNotepadAct = new QAction(tr("关于记事本(&A)"), this);

 }

 //create all munus

 void Notepad::createMenus()

 {

     fileMenu = this->menuBar()->addMenu(tr("文件(&F)"));

     editMenu = this->menuBar()->addMenu(tr("编辑(&E)"));

     formatMenu = this->menuBar()->addMenu(tr("格式(&O)"));

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

     helpMenu = this->menuBar()->addMenu(tr("帮助(&H)"));

 }

 //create textEdit

 void Notepad::createOther()

 {

     clipboard = QApplication::clipboard();

     QWidget *widget = new QWidget;

     textEdit = new QTextEdit();

     textEdit->setAcceptRichText(false);

     //set font

     QFont font("Arial", );

     textEdit->setFont(font);

     updateScrollBar();

     updateTextEdit();

     QHBoxLayout *mainLayout = new QHBoxLayout;

     mainLayout->setMargin();//important

     mainLayout->addWidget(textEdit);

     widget->setLayout(mainLayout);

     setCentralWidget(widget);

 }

 //create all connectors

 void Notepad::createConnectors()

 {

     connect(textEdit, SIGNAL(undoAvailable(bool)), this, SLOT(updateUndoAct(bool)));

     connect(textEdit, SIGNAL(redoAvailable(bool)), this, SLOT(updateRedoAct(bool)));

     connect(textEdit, SIGNAL(copyAvailable(bool)), this, SLOT(updateCutAct(bool)));

     connect(textEdit, SIGNAL(copyAvailable(bool)), this, SLOT(updateCopyAct(bool)));

     connect(textEdit, SIGNAL(copyAvailable(bool)), this, SLOT(updateDeleteAct(bool)));

     connect(textEdit, SIGNAL(textChanged()), this, SLOT(updateFindGroupActs()));

     connect(textEdit, SIGNAL(textChanged()), this, SLOT(updateSelectAllAct()));

     connect(textEdit, SIGNAL(textChanged()), this, SLOT(updateRowCol()));

     connect(clipboard, SIGNAL(dataChanged()), this, SLOT(updatePasteAct()));

     connect(this, SIGNAL(saveSignal(bool)), this, SLOT(updateSaveAct(bool)));

     //new file

     connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));

     //open file

     connect(openAct, SIGNAL(triggered()), this, SLOT(openFile()));

     //save file

     connect(saveAct, SIGNAL(triggered()), this, SLOT(saveFile()));

     //save as file

     connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAsFile()));

     //page setup

     connect(pageSetupAct, SIGNAL(triggered()), this, SLOT(pageSetup()));

     //print

     connect(printAct, SIGNAL(triggered()), this, SLOT(print()));

     //close

     connect(quitAct, SIGNAL(triggered()), this, SLOT(quit()));

     //undo

     connect(undoAct, SIGNAL(triggered()), this, SLOT(undo()));

     //redo

     connect(redoAct, SIGNAL(triggered()), this, SLOT(redo()));

     //cut

     connect(cutAct, SIGNAL(triggered()), this, SLOT(cut()));

     //copy

     connect(copyAct, SIGNAL(triggered()), this, SLOT(copy()));

     //paste

     connect(pasteAct, SIGNAL(triggered()), this, SLOT(paste()));

     //del

     connect(deleteAct,SIGNAL(triggered()), this, SLOT(del()) );

     //find dialog

     connect(findAct, SIGNAL(triggered()), this, SLOT(findDialog()));

     //find next

     connect(findNextAct, SIGNAL(triggered()), this, SLOT(findNext()));

     //replace dialog

     connect(replaceAct, SIGNAL(triggered()), this, SLOT(replaceDialog()));

     //go to dialog

     connect(gotoAct, SIGNAL(triggered()), this, SLOT(gotoLine()));

     //select all

     connect(selectAllAct, SIGNAL(triggered()), this, SLOT(selectAll()));

     //add date

     connect(timeAct, SIGNAL(triggered()), this, SLOT(addTime()));

     //auto new line

     connect(autoNewLineAct, SIGNAL(triggered()), this, SLOT(autoNewLine()));

     //font dlg

     connect(fontAct, SIGNAL(triggered()), this, SLOT(fontDlg()));

     //status bar

     connect(statusBarAct, SIGNAL(triggered()), this, SLOT(myStatusBar()));

     //view help

     connect(viewHelpAct, SIGNAL(triggered()), this, SLOT(viewHelp()));

     //about

     connect(aboutNotepadAct, SIGNAL(triggered()), this, SLOT(about()));

 }

 //add all shortcuts

 void Notepad::joinShortcuts()

 {

     newAct->setShortcut(QKeySequence::New);

     openAct->setShortcut(QKeySequence::Open);

     saveAct->setShortcut(QKeySequence::Save);

     //saveAsAct->setShortcut(QKeySequence::SaveAs);

     saveAsAct->setShortcut(QKeySequence(tr("Ctrl+Shift+S")));

     pageSetupAct->setShortcut(QKeySequence(tr("Ctrl+E")));

     printAct->setShortcut(QKeySequence::Print);

     quitAct->setShortcut(QKeySequence(tr("Ctrl+Q")));

     //quitAct->setShortcut(QKeySequence::Quit);

     undoAct->setShortcut(QKeySequence::Undo);

     redoAct->setShortcut(QKeySequence::Redo);

     cutAct->setShortcut(QKeySequence::Cut);

     copyAct->setShortcut(QKeySequence::Copy);

     pasteAct->setShortcut(QKeySequence::Paste);

     deleteAct->setShortcut(QKeySequence::Delete);

     newAct->setShortcut(QKeySequence::New);

     findAct->setShortcut(QKeySequence::Find);

     findNextAct->setShortcut(QKeySequence::FindNext);

     replaceAct->setShortcut(QKeySequence::Replace);

     gotoAct->setShortcut(QKeySequence(tr("Ctrl+G")));

     selectAllAct->setShortcut(QKeySequence::SelectAll);

     timeAct->setShortcut(QKeySequence(tr("F5")));

     viewHelpAct->setShortcut(QKeySequence::HelpContents);

 }

 //add all actions to menus

 void Notepad::joinActions()

 {

     fileMenu->addAction(newAct);

     fileMenu->addAction(openAct);

     fileMenu->addAction(saveAct);

     fileMenu->addAction(saveAsAct);

     fileMenu->addSeparator();

     fileMenu->addAction(pageSetupAct);

     fileMenu->addAction(printAct);

     fileMenu->addSeparator();

     fileMenu->addAction(quitAct);

     editMenu->addAction(undoAct);

     editMenu->addAction(redoAct);

     editMenu->addSeparator();

     editMenu->addAction(cutAct);

     editMenu->addAction(copyAct);

     editMenu->addAction(pasteAct);

     editMenu->addAction(deleteAct);

     editMenu->addSeparator();

     editMenu->addAction(findAct);

     editMenu->addAction(findNextAct);

     editMenu->addAction(replaceAct);

     editMenu->addAction(gotoAct);

     editMenu->addSeparator();

     editMenu->addAction(selectAllAct);

     editMenu->addAction(timeAct);

     formatMenu->addAction(autoNewLineAct);

     formatMenu->addAction(fontAct);

     viewMenu->addAction(statusBarAct);

     helpMenu->addAction(viewHelpAct);

     helpMenu->addSeparator();

     helpMenu->addAction(aboutNotepadAct);

 }

2. 每个菜单的逻辑, 这个要设计以下, 不能一上来就写代码, 容易返工,最后乱成一团

3. 编写代码, 一项一项来, 就像机械3D建模一样, 按组件来建立

这个有点多了, 就列下头文件, 后面整理了代码,再传上来

 /*************************************

 **fileName: notepad.h

 **author: kakasi (gongsunyongwu@163.com)

 **version: v1.0

 **date: 2015-10-14

 **last edit date: 2015-10-24 by kakasi

 **************************************/

 #ifndef NOTEPAD_H

 #define NOTEPAD_H

 #include <QMainWindow>

 #include "common.h"

 class QTextEdit;

 class QAction;

 class QMenu;

 class QClipboard;

 class QPrinter;

 class FindDialog;

 class ReplaceDialog;

 class GotoDialog;

 class QLabel;

 class Notepad : public QMainWindow

 {

     Q_OBJECT

 public:

     Notepad();

 signals:

     void saveSignal(bool b);

 private slots:

     //========update acts=======

     void updateUndoAct(bool b);

     void updateRedoAct(bool b);

     void updateCutAct(bool b);

     void updateCopyAct(bool b);

     void updateDeleteAct(bool b);

     void updatePasteAct();

     void updateSaveAct(bool b);

     void updateFindGroupActs();

     void updateSelectAllAct();

     void remberOldPosition();

     void printPreview(QPrinter *printer);

     //========actions=========

     void newFile();

     void openFile();

     bool saveFile();

     bool saveAsFile();

     void pageSetup();

     void print();

     void quit();

     void undo();

     void redo();

     void cut();

     void copy();

     void paste();

     void del();

     void findDialog();

     //find string

     void findString(FindData *findData);

     //find next

     void findNext();

     //replace dialog

     void replaceDialog();

     //replace

     void replace();

     //replace all

     void replaceAll();

     //goto

     void gotoLine();

     //go to sub

     void gotoLineSub(int lineNumber);

     //select all

     void selectAll();

     //date

     void addTime();

     //auto new line

     void autoNewLine();

     //font dialog

     void fontDlg();

     //status bar

     void myStatusBar();

     //update row and col

     void updateRowCol();

     //view help

     void viewHelp();

     //about

     void about();

 private:

     //create all actions

     void createActions();

     //create all menus

     void createMenus();

     //create textEdit

     void createOther();

     //create all connectors

     void createConnectors();

     //add all shortcuts

     void joinShortcuts();

     //add all actions to menus

     void joinActions();

     //init size

     void initSize();

     //initialize menu status

     void initMenuStatus();

     //init status bar

     void initStatusBar();

     //init variables

     void initVariables();

     //init printer

     void initPrinter();

     //update ui

     void updateAppUI();

     //get file name info from file path

     void showFileNameInfo(QString filePath);

     //set file title and suffix

     void setFileInfo(QString filePath);

     //new file sub

     bool newFileSub();

     //open file sub

     bool openFileSub();

     //get file path

     QString getOpenedFilePath();

     //tip to save

     int isToSave();

     //save file

     bool saveFileSub(QString filePath);

     //get file path

     QString getSavedFilePath(QString fileTitle = "");

     //get file type from dialog selected type

     QString getSelectedType(QString selectedType);

     //replace sub

     void replaceSub();

     //update go to act

     void updategotoAct();

     //update scroll bar

     void updateScrollBar();

     //update text edit

     void updateTextEdit();

     //update status bar

     void updateStatusBarAct();

     //get column

     int getColumn();

     //get line

     int getLine();

     //update status bar

     void updateStatusBar();

 private:

     //others

     bool statusChecked;

     bool autoChecked;

     int oldPosition;

     QStatusBar *m_statusBar;

     QLabel *statusLabel;

     GotoDialog *gotoDlg;

     FindDialog *findDlg;

     ReplaceDialog *replaceDlg;

     FindData *findData;

     QClipboard *clipboard;

     QTextEdit *textEdit;

     QPrinter *printer;

     bool saved;

     bool isFind;

     QString fileTitle;

     QString appTitle;

     QString fileSuffix;

     QString filePath;

     QString fileType;

     //all menus

     QMenu *fileMenu;

     QMenu *editMenu;

     QMenu *formatMenu;

     QMenu *viewMenu;

     QMenu *helpMenu;

     //all actions

     QAction *newAct;

     QAction *openAct;

     QAction *saveAct;

     QAction *saveAsAct;

     QAction *pageSetupAct;

     QAction *printAct;

     QAction *quitAct;

     QAction *undoAct;

     QAction *redoAct;

     QAction *cutAct;

     QAction *copyAct;

     QAction *pasteAct;

     QAction *deleteAct;

     QAction *findAct;

     QAction *findNextAct;

     QAction *replaceAct;

     QAction *gotoAct;

     QAction *selectAllAct;

     QAction *timeAct;

     QAction *autoNewLineAct;

     QAction *fontAct;

     QAction *statusBarAct;

     QAction *viewHelpAct;

     QAction *aboutNotepadAct;

 };

 #endif // NOTEPAD_H

4. 最后的成品大概是这样的, 其中有部分内容根据自己的喜好做了小改动, 差了一个图标, 有时间再弄下.

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