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", 12);

    textEdit->setFont(font);

    updateScrollBar();

    updateTextEdit();

    QHBoxLayout *mainLayout = new QHBoxLayout;

    mainLayout->setMargin(0);//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 ([e-mail])

**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.