Qt中的文本编辑组件

QT教程 08-06 230

前言：

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一、文本编辑组件

1、Qt支持三种常用的文本编辑组件

（1）、QLineEdit：单行文本编辑组件

（2）、QTextEdit：多行富文本（有图片、视频等）编辑组件

（3）、QPlainTextEdit：多行普通文本编辑组件

2、Qt中常用文本编辑组件的继承层次图

3、不同文本组件的特性比较

4、Qt中常用文本编辑组件内置功能

1、初探文本编辑组件

#include "MainWindow.h"MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent),  lineEdit(this), plainEdit(this), textEdit(this){    resize(600, 420);    lineEdit.move(20, 20);    lineEdit.resize(560, 100);    lineEdit.insert("QLineEdit");    lineEdit.insert("\n");    lineEdit.insert("<img src=\"C:\\Users\\hp\\Desktop\\D.T.png\" />");    plainEdit.move(20, 130);    plainEdit.resize(560, 130);    plainEdit.insertPlainText("QPlainTextEdit");    plainEdit.insertPlainText("\n");    plainEdit.insertPlainText("<img src=\"C:\\Users\\hp\\Desktop\\D.T.png\" />");    textEdit.move(20, 270);    textEdit.resize(560, 130);    textEdit.insertPlainText("QTextEdit");    textEdit.insertPlainText("\n");    textEdit.insertHtml("<img src=\"C:\\Users\\hp\\Desktop\\D.T.png\" />");}MainWindow::~MainWindow(){    }

2、NopePad：

#ifndef MAINWINDOW_H#define MAINWINDOW_H#include <QMenuBar>#include <QMenu>#include <QAction>#include <QString>#include <QtGui/QMainWindow>#include <QToolBar>#include <QIcon>#include <QSize>#include <QStatusBar>#include <QLabel>#include <QPlainTextEdit>class MainWindow : public QMainWindow{    Q_OBJECTprivate:        QPlainTextEdit mainEdit;        QLabel statusLabel;        MainWindow(QWidget *parent = 0);        MainWindow(const MainWindow& obj);        MainWindow* operator = (const MainWindow& obj);        bool construct();        bool initMenuBar();//菜单栏        bool initToolBar();//工具栏        bool initStatusBar();//状态栏        bool initinitMainEditor();//编辑窗口        bool initFileMenu(QMenuBar* mb);//文件菜单        bool initEditMenu(QMenuBar* mb);//编辑菜单        bool initFormatMenu(QMenuBar* mb);//格式菜单        bool initViewMenu(QMenuBar* mb);//视图菜单        bool initHelpMenu(QMenuBar* mb);//帮助菜单        bool initFileToolItem(QToolBar* tb);        bool makeAction(QAction*& action, QString text, int ket);//菜单项        bool makeAction(QAction*& action, QString tip, QString icon);public:     static MainWindow* NewInstance();    ~MainWindow();};#endif // MAINWINDOW_H

#include "MainWindow.h"MainWindow::MainWindow(QWidget *parent)    : QMainWindow(parent), statusLabel(this){}bool MainWindow::construct(){    bool ret = true;    ret = ret && initMenuBar();    ret = ret && initToolBar();    ret = ret && initStatusBar();    ret = ret && initinitMainEditor();    return ret;}MainWindow* MainWindow::NewInstance(){    MainWindow* ret = new MainWindow();    if((ret==NULL) || (!ret->construct()))    {        delete ret;        ret = NULL;    }    return ret;}bool MainWindow::initMenuBar()//菜单栏{    bool ret = true;    QMenuBar* mb = menuBar();//一定要注意是menuBar()，这是普通成员函数，不是构造函数    ret = ret && initFileMenu(mb);//传一个参数是为了在initFileMenu()函数将menu加入菜单栏    ret = ret && initEditMenu(mb);    ret = ret && initFormatMenu(mb);    ret = ret && initViewMenu(mb);    ret = ret && initHelpMenu(mb);    return ret;}bool MainWindow::initToolBar()//工具栏{    bool ret = true;    QToolBar* tb = addToolBar("Tool Bar");    tb->setMovable(false);    tb->setFloatable(false);    tb->setIconSize(QSize(16,16));    ret = ret && initFileToolItem(tb);    return ret;}bool MainWindow::initStatusBar()//状态栏{    bool ret = true;    QStatusBar* sb = statusBar();    QLabel* label = new QLabel("Made By LGC");    if(label != NULL)    {        statusLabel.setMinimumWidth(200);        statusLabel.setAlignment(Qt::AlignHCenter);        statusLabel.setText("Ln:1    Col:1");        label->setMinimumWidth(200);        label->setAlignment(Qt::AlignHCenter);        sb->addPermanentWidget(new QLabel());//单纯加入分隔符        sb->addPermanentWidget(&statusLabel);        sb->addPermanentWidget(label);    }    else    {        ret = false;    }    return ret;}bool MainWindow::initinitMainEditor()//编辑窗口{    bool ret = true;    mainEdit.setParent(this);    setCentralWidget(&mainEdit);    return ret;}/************************************************文件菜单********************************************************/bool MainWindow::initFileMenu(QMenuBar* mb){    bool ret = true;    QMenu* menu = new QMenu("File(&F)");//创建文件菜单，（&F）是为了可以Alt+F打开    ret = (menu != NULL);    if(ret)    {        QAction* action = NULL;        //New        ret = ret &&  makeAction(action, "New(&N)",Qt::CTRL + Qt::Key_N);        if(ret)        {           menu->addAction(action);        }        menu->addSeparator();        //Open        ret = ret &&  makeAction(action, "Open(&O)...",Qt::CTRL + Qt::Key_O);        if(ret)        {           menu->addAction(action);        }        menu->addSeparator();        //Save        ret = ret &&  makeAction(action, "Save(&S)",Qt::CTRL + Qt::Key_S);        if(ret)        {           menu->addAction(action);        }        menu->addSeparator();        //Save As        ret = ret &&  makeAction(action, "Save As(&A)...",0);        if(ret)        {           menu->addAction(action);        }        menu->addSeparator();        //print        ret = ret &&  makeAction(action, "Print(&P)...",Qt::CTRL + Qt::Key_P);        if(ret)        {           menu->addAction(action);        }        menu->addSeparator();        //Exit        ret = ret &&  makeAction(action, "Exit(&X)",0);        if(ret)        {           menu->addAction(action);//将菜单项加入到菜单        }    }    if(ret)    {        mb->addMenu(menu);//将菜单加入到菜单栏    }    else    {        delete mb;    }    return ret;}/************************************************编辑菜单********************************************************/bool MainWindow::initEditMenu(QMenuBar* mb){    bool ret = true;    QMenu* menu = new QMenu("Edit(&E)");    ret = (menu != NULL);    if(ret)    {        QAction* action = NULL;        //Undo        ret = ret &&  makeAction(action, "Undo(&U)",Qt::CTRL + Qt::Key_Z);        if(ret)        {           menu->addAction(action);        }        menu->addSeparator();        //Redo        ret = ret &&  makeAction(action, "Redo(&R)...",Qt::CTRL + Qt::Key_Y);        if(ret)        {           menu->addAction(action);        }        menu->addSeparator();        //Cut        ret = ret &&  makeAction(action, "Cut(&T)",Qt::CTRL + Qt::Key_X);        if(ret)        {           menu->addAction(action);        }        menu->addSeparator();        //Copy        ret = ret &&  makeAction(action, "Copy(&C)...",Qt::CTRL + Qt::Key_C);        if(ret)        {           menu->addAction(action);        }        menu->addSeparator();        //Pase        ret = ret &&  makeAction(action, "Pase(&P)...",Qt::CTRL + Qt::Key_V);        if(ret)        {           menu->addAction(action);        }        menu->addSeparator();        //Delete        ret = ret &&  makeAction(action, "Delete(&L)",Qt::Key_Delete);        if(ret)        {           menu->addAction(action);        }        menu->addSeparator();        //Find        ret = ret &&  makeAction(action, "Find(&F)...",Qt::CTRL + Qt::Key_F);        if(ret)        {           menu->addAction(action);        }        menu->addSeparator();        //Replace        ret = ret &&  makeAction(action, "Replace(&R)...",Qt::CTRL + Qt::Key_H);        if(ret)        {           menu->addAction(action);        }        menu->addSeparator();        //Goto        ret = ret &&  makeAction(action, "Goto(&G)",Qt::CTRL + Qt::Key_G);        if(ret)        {           menu->addAction(action);        }        menu->addSeparator();        //Select All        ret = ret &&  makeAction(action, "Select All(&A)",Qt::CTRL + Qt::Key_A);        if(ret)        {           menu->addAction(action);        }    }    if(ret)    {        mb->addMenu(menu);    }    else    {        delete mb;    }    return ret;}/************************************************格式菜单********************************************************/bool MainWindow::initFormatMenu(QMenuBar* mb){    bool ret = true;    QMenu* menu = new QMenu("Format(&O)");    ret = (menu != NULL);    if(ret)    {        QAction* action = NULL;        //Auto Wrap        ret = ret &&  makeAction(action, "Auto Wrap(&W)",0);        if(ret)        {           menu->addAction(action);        }        menu->addSeparator();        //Font        ret = ret &&  makeAction(action, "Font(&F)...",0);        if(ret)        {           menu->addAction(action);        }    }    if(ret)    {        mb->addMenu(menu);    }    else    {        delete mb;    }    return ret;}/************************************************视图菜单********************************************************/bool MainWindow::initViewMenu(QMenuBar* mb){    bool ret = true;    QMenu* menu = new QMenu("View(&V)");    ret = (menu != NULL);    if(ret)    {        QAction* action = NULL;        //Tool Bar        ret = ret &&  makeAction(action, "Tool Bar(&T)",0);        if(ret)        {           menu->addAction(action);        }        menu->addSeparator();        //Status Bar        ret = ret &&  makeAction(action, "Status Bar(&S)",0);        if(ret)        {           menu->addAction(action);        }    }    if(ret)    {        mb->addMenu(menu);    }    else    {        delete mb;    }    return ret;}/************************************************帮助菜单********************************************************/bool MainWindow::initHelpMenu(QMenuBar* mb){    bool ret = true;    QMenu* menu = new QMenu("Help(&H)");    ret = (menu != NULL);    if(ret)    {        QAction* action = NULL;        //User Manual        ret = ret &&  makeAction(action, "User Manual",0);        if(ret)        {           menu->addAction(action);        }        menu->addSeparator();        //About NotePad        ret = ret &&  makeAction(action, "About NotePad...",0);        if(ret)        {           menu->addAction(action);        }    }    if(ret)    {        mb->addMenu(menu);    }    else    {        delete mb;    }    return ret;}bool MainWindow::initFileToolItem(QToolBar* tb){    bool ret = true;    QAction* action = NULL;    ret = ret && makeAction(action, "New", ":/Res/pic/new.png");    if(ret)    {        tb->addAction(action);    }    ret = ret && makeAction(action, "Open", ":/Res/pic/open.png");    if(ret)    {        tb->addAction(action);    }    ret = ret && makeAction(action, "Save", ":/Res/pic/save.png");    if(ret)    {        tb->addAction(action);    }    ret = ret && makeAction(action, "Save As", ":/Res/pic/saveas.png");    if(ret)    {        tb->addAction(action);    }    ret = ret && makeAction(action, "Print", ":/Res/pic/print.png");    if(ret)    {        tb->addAction(action);    }    ret = ret && makeAction(action, "Undo", ":/Res/pic/undo.png");    if(ret)    {        tb->addAction(action);    }    ret = ret && makeAction(action, "Redo", ":/Res/pic/redo.png");    if(ret)    {        tb->addAction(action);    }    return ret;}bool MainWindow::makeAction(QAction*& action, QString text, int key)//菜单项{    bool ret = true;    action = new QAction(text, NULL);    if(action != NULL)    {        action->setShortcut(QKeySequence(key));//创建快捷键    }    else    {        ret = false;    }    return ret;}bool MainWindow::makeAction(QAction*& action, QString tip, QString icon){    bool ret = true;    action = new QAction("", NULL);    if(action != NULL)    {        action->setToolTip(tip);        action->setIcon(QIcon(icon));    }    else    {        ret = false;    }    return ret;}MainWindow::~MainWindow(){    }

#include <QtGui/QApplication>#include "MainWindow.h"int main(int argc, char *argv[]){    QApplication a(argc, argv);    MainWindow* w = MainWindow::NewInstance();    int ret = -1;    if(w != NULL)    {        w->show();        ret = a.exec();    }    delete w;    return ret;}

二、小结

（1）、Qt支持三种常用的文本编辑组件

（2）、Qt中的文本编辑组件封装了常用的编辑功能

A、QLineEdit：单行文本编辑组件

B、QTextEdit：多行富文本编辑组件

C、QPlainTextEdit：多行普通文本编辑组件

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