qt编辑器用法（Qt中的文本编辑组件）

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_OBJECT private: 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; }

（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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