QTextEdit实现富文本记事本

2023-12-22 06:48
文章标签 实现 文本 记事本 qtextedit

本文主要是介绍QTextEdit实现富文本记事本，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

用Qt实现一个多功能记事本,
功能 :布局对齐,字体变换,颜色改变.
格式 :自动保存为rtf格式,支持txt格式,兼容MS Word打开.
涉及知识 :文件保存过滤器的使用,文件的输入输出流,光标的控制
可能会有一些小Bug
效果图如下:
这里写图片描述

/*---------------MyNotepad.h--------------------*/
#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include <QAction>
#include <QMenu>
#include <QTextEdit>
#include <QMenuBar>
#include <QCloseEvent>
#include <QLabel>
class MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent = 0);~MainWindow();void mergeFormat(QTextCharFormat fmt);bool boldcheck;bool Italiccheck;bool UnderLinecheck;private:QAction *fileNew;QAction *fileOpen;QAction *fileExit;QAction *fileSave;QAction *copyAct;QAction *pasteAct;QAction *cutAct;QAction *fontAct;QAction *colAct;QAction *selAct;QAction *timeAct;QAction *boldAct;QAction *underAct;QAction *italicAct;QAction *leftAct;QAction *rightAct;QAction *centerAct;QAction *about;QAction *aboutAuthor;QMenu *Menu;QTextEdit *textEdit;QLabel *lableft;QLabel *labright;void closeEvent(QCloseEvent *event);
private slots:void newfile();void openfile();void exitfile();void savefile();void copyword();void cutword();void pasteword();void selslot();void colslot();void fontslot();void timeslot();void italicslot();void underslot();void boldslot();void showabout();void layoutLeft();void layoutRight();void layoutCenter();void showauthor();
};#endif // MAINWINDOW_H/*---------------MyNotepad.h--------------------*/

/*---------------MyNotepad.cpp--------------------*/
#include "mainwindow.h"
#include <QTextCursor>
#include <QFileDialog>
#include <QFile>
#include <QString>
#include <QTextStream>
#include <QMessageBox>
#include <QHBoxLayout>
#include <QMessageBox>
#include <QColor>
#include <QColorDialog>
#include <QFont>
#include <QFontDialog>
#include <QDateTime>
#include <QMovie>
#include <QDesktopServices>
MainWindow::MainWindow(QWidget *parent): QMainWindow(parent)
{fileNew = new QAction(tr("新建"),this);fileNew->setShortcut(tr("Ctrl+N"));fileOpen = new QAction(tr("打开"),this);fileOpen->setShortcut(tr("Ctrl+O"));fileExit = new QAction(tr("退出"),this);fileExit->setShortcut(tr("Ctrl+Q"));fileSave = new QAction(tr("保存"),this);fileSave->setShortcut(tr("Ctrl+S"));copyAct = new QAction(tr("复制"),this);copyAct->setShortcut(tr("Ctrl+C"));pasteAct = new QAction(tr("粘贴"),this);pasteAct->setShortcut(tr("Ctrl+V"));cutAct = new QAction(tr("剪切"),this);cutAct->setShortcut(tr("Ctrl+X"));selAct  = new QAction(tr("全选"),this);selAct->setShortcut(tr("Ctrl+A"));fontAct = new QAction(tr("改变字体"),this);fontAct->setShortcut(tr("Alt+F"));colAct  = new QAction(tr("添加颜色"),this);colAct->setShortcut(tr("Alt+C"));timeAct = new QAction(tr("当前时间"),this);timeAct->setShortcut(tr("F5"));boldAct = new QAction(tr("加粗"),this);boldAct->setShortcut(tr("Ctrl+B"));italicAct = new QAction(tr("斜体"),this);italicAct->setShortcut(tr("Ctrl+I"));underAct= new QAction(tr("下划线"),this);underAct->setShortcut(tr("Ctrl+U"));leftAct = new QAction(tr("左对齐"),this);leftAct->setShortcut(tr("Ctrl+L"));rightAct = new QAction(tr("右对齐"),this);rightAct->setShortcut(tr("Ctrl+R"));centerAct = new QAction(tr("居中"),this);centerAct->setShortcut(tr("Ctrl+E"));about = new QAction(tr("关于"),this);aboutAuthor = new QAction(tr("关于作者"),this);Menu = menuBar()->addMenu(tr("文件(&D)"));Menu->addAction(fileNew);Menu->addAction(fileOpen);Menu->addAction(fileSave);Menu->addSeparator();Menu->addAction(fileExit);Menu = menuBar()->addMenu(tr("编辑(&E)"));Menu->addAction(copyAct);Menu->addAction(cutAct);Menu->addAction(pasteAct);Menu->addAction(selAct);Menu = menuBar()->addMenu(tr("功能(&O)"));Menu->addAction(boldAct);Menu->addAction(italicAct);Menu->addAction(underAct);Menu->addSeparator();Menu->addAction(fontAct);Menu->addAction(colAct);Menu->addAction(timeAct);Menu = menuBar()->addMenu(tr("布局(&V)"));Menu->addAction(centerAct);Menu->addAction(leftAct);Menu->addAction(rightAct);Menu = menuBar()->addMenu(tr("帮助(&H)"));Menu->addAction(about);Menu->addAction(aboutAuthor);boldcheck = true;Italiccheck = true;UnderLinecheck = true;QFont font1("Microsoft YaHei", 12);textEdit = new QTextEdit;textEdit->setFont(font1);textEdit->acceptRichText();//textEdit->setStyleSheet("background-color: #C7EDCC;");this->setWindowTitle(tr("萌萌哒o(≧∇≦o)~Editer"));this->resize(750,550);this->layout()->setMargin(20);this->setCentralWidget(textEdit);this->setWindowIcon(QIcon(":/notepad.ico"));connect(fileNew, SIGNAL(triggered()), this, SLOT(newfile()));connect(fileOpen, SIGNAL(triggered()), this, SLOT(openfile()));connect(fileExit, SIGNAL(triggered()), this, SLOT(exitfile()));connect(fileSave, SIGNAL(triggered()), this, SLOT(savefile()));connect(copyAct, SIGNAL(triggered()), this, SLOT(copyword()));connect(cutAct, SIGNAL(triggered()), this, SLOT(cutword()));connect(pasteAct, SIGNAL(triggered()), this, SLOT(pasteword()));connect(boldAct, SIGNAL(triggered()), this, SLOT(boldslot()));connect(italicAct, SIGNAL(triggered()), this, SLOT(italicslot()));connect(underAct, SIGNAL(triggered()), this, SLOT(underslot()));connect(fontAct, SIGNAL(triggered()), this, SLOT(fontslot()));connect(colAct, SIGNAL(triggered()), this, SLOT(colslot()));connect(selAct, SIGNAL(triggered()), this, SLOT(selslot()));connect(timeAct, SIGNAL(triggered()), this,SLOT(timeslot()));connect(leftAct, SIGNAL(triggered()), this, SLOT(layoutLeft()));connect(rightAct, SIGNAL(triggered()), this, SLOT(layoutRight()));connect(centerAct, SIGNAL(triggered()), this, SLOT(layoutCenter()));connect(aboutAuthor, SIGNAL(triggered()), this, SLOT(showauthor()));connect(about, SIGNAL(triggered()), this, SLOT(showabout()));
}MainWindow::~MainWindow()
{}void MainWindow::newfile()
{if(textEdit->document()->isModified()){if( "" != textEdit->toPlainText() ){QMessageBox::StandardButton select = QMessageBox::question(this, "",tr("是否要保存文件内容?"),QMessageBox::Yes|QMessageBox::No|QMessageBox::Cancel,QMessageBox::Yes);if(select == QMessageBox::Yes){savefile();textEdit->clear();}if(select == QMessageBox::No){textEdit->clear();}if(select == QMessageBox::Cancel){;}}}}void MainWindow::openfile()
{QString filename = QFileDialog::getOpenFileName(this, tr("打开文件"),QDir::currentPath(),tr("富文本(*.rtf);;纯文本(*.txt)"));QString Path(filename);char *Tmppath = (char *)filename.toStdString().data();for(int i = filename.length(); i > 0; --i){if(Tmppath[i-1] == '/'){Tmppath += i;break;}}Path.sprintf("%s - %s",Tmppath, "萌萌哒o(≧∇≦o)~Editer" );setWindowTitle(Path);QFile file(filename);if(file.open(QFile::ReadWrite)){textEdit->clear();QTextStream stream(&file);if(!stream.atEnd()){textEdit->setText(stream.readAll());}}}void MainWindow::exitfile()
{close();
}void MainWindow::savefile()
{QFileDialog dialog(this,"保存文件","C:\\Users\\Administrator\\Desktop",tr("富文本(*.rtf);;纯文本(*.txt)"));dialog.setAcceptMode(QFileDialog::AcceptSave);QString filterMod;QString fileName;if(dialog.exec()){fileName  = dialog.selectedFiles()[0];filterMod = dialog.selectedNameFilter();}QFile file(fileName);if(file.open(QFile::WriteOnly |QFile::Truncate)){QTextStream stream(&file);if("富文本(*.rtf)" == filterMod)stream<<textEdit->toHtml().toUtf8();if("纯文本(*.txt)" == filterMod){QMessageBox::StandardButton button =QMessageBox::warning(this, tr("提示"),QString(tr("保存为纯文本格式，颜色、字体等属性会丢失。\n确定要这样做么?")),QMessageBox::Yes|QMessageBox::No,QMessageBox::No);if(button == QMessageBox::Yes){stream<<textEdit->toPlainText().toUtf8();}else{;}}}file.close();
}void MainWindow::closeEvent(QCloseEvent *event)
{QMessageBox::StandardButton button =QMessageBox::question(this, tr("退出程序"),QString(tr("是否退出")),QMessageBox::Yes|QMessageBox::No,QMessageBox::No);if(button == QMessageBox::Yes){event->accept();}else{event->ignore();}}void MainWindow::copyword()
{textEdit->copy();
}void MainWindow::cutword()
{textEdit->cut();
}void MainWindow::pasteword()
{textEdit->paste();
}void MainWindow::selslot()
{textEdit->selectAll();
}void MainWindow::colslot()
{const QColorDialog::ColorDialogOptions options = QFlag(QColorDialog::ShowAlphaChannel);const QColor color = QColorDialog::getColor(Qt::green, this, tr("选择颜色"), options);if (color.isValid()){textEdit->setTextColor(color);}
}void MainWindow::fontslot()
{bool ok;QFont font = QFontDialog::getFont(&ok, QFont(tr("微软雅黑"), 15), this);if (ok){//textEdit->setFont(font);QTextCharFormat fmt;fmt.setFont(font);mergeFormat(fmt);} else{;}}void MainWindow::timeslot()
{textEdit->append(QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss"));}//设置光标的选区，使格式作用于选区内的字符
void MainWindow::mergeFormat(QTextCharFormat fmt)
{QTextCursor cursor = textEdit->textCursor();if (!cursor.hasSelection()) {cursor.select(QTextCursor::WordUnderCursor);}cursor.mergeCharFormat(fmt);
}//加粗
void MainWindow::boldslot()
{QTextCharFormat fmt;fmt.setFontWeight(boldcheck ? QFont::Bold : QFont::Normal);mergeFormat(fmt);boldcheck = !boldcheck;
}
//倾斜
void MainWindow::italicslot()
{QTextCharFormat fmt;fmt.setFontItalic(Italiccheck ? true : false);mergeFormat(fmt);Italiccheck = !Italiccheck;
}//下划线
void MainWindow::underslot()
{QTextCharFormat fmt;fmt.setFontUnderline(UnderLinecheck ? true : false);mergeFormat(fmt);UnderLinecheck = !UnderLinecheck;
}//左对齐
void MainWindow::layoutLeft()
{if ( textEdit->alignment() != Qt::AlignLeft )textEdit->setAlignment(Qt::AlignLeft);elsetextEdit->setAlignment( textEdit->alignment() ^ Qt::AlignLeft);}//居中对齐
void MainWindow::layoutCenter()
{if ( textEdit->alignment() != Qt::AlignCenter )textEdit->setAlignment(Qt::AlignCenter);elsetextEdit->setAlignment( textEdit->alignment() ^ Qt::AlignCenter);}void MainWindow::showauthor()
{QDesktopServices::openUrl(QUrl("http://blog.csdn.net/sinat_29173167"));}//右对齐
void MainWindow::layoutRight()
{if ( textEdit->alignment() != Qt::AlignRight )textEdit->setAlignment(Qt::AlignRight);elsetextEdit->setAlignment( textEdit->alignment() ^ Qt::AlignRight);}void MainWindow::showabout()
{QDialog *w;w = new QDialog(this);w->setWindowTitle(tr("关于 - 萌萌哒o(≧∇≦o)~Editer"));w->setFixedHeight(200);w->setFixedWidth(400);QMovie *gif = new QMovie(":/panda.gif");lableft = new QLabel(w);lableft->setMovie(gif);//lableft->setSizePolicy(QSizePolicy::horizontalPolicy(),QSizePolicy::verticalStretch());//lableft->resize(gif->width(),gif->height());gif->start();labright = new QLabel(w);QFont ft("Microsoft YaHei", 10);ft.setBold(25);labright->setFont(ft);labright->setText(tr("Plantform: Win/Linux\n\nAll Copyleft Reseverd."));QHBoxLayout *layout = new QHBoxLayout(w);layout->setSpacing(25);layout->setMargin(10);layout->addWidget(lableft);layout->addWidget(labright);w->exec();delete w;
}/*---------------MyNotepad.cpp--------------------*/
/*---------------main.cpp--------------------*/
#include "mainwindow.h"
#include <QApplication>
#include <QTextCodec>
#include <QMessageBox>
int main(int argc, char *argv[])
{QApplication a(argc, argv);MainWindow w;w.show();return a.exec();
}/*---------------main.cpp--------------------*/

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