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Qt4系列之开发文本编辑器

网友投稿 638 2022-05-30

mainwindow.h:

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

Q_OBJECT

public:

explicit MainWindow(QWidget *parent = 0);

void createAction();

void createMenu();

void createToolBar();

void fileRead();//读文件

void fileWrite();//写文件

~MainWindow();

public:

Ui::MainWindow *ui;

QMenu *file;

QMenu *edit;

QMenu *style;

QMenu *insert;//插入菜单

QMenu *search;//查找菜单

QMenu *help;//帮助菜单

QToolBar *fileToolBar;

QToolBar *editToolBar;

QToolBar *styleToolBar;

QToolBar *insertToolBar;

QToolBar *searchToolBar;

QToolBar *helpToolBar;

QTextEdit *textEdit;

QAction *newFile;

QAction *openFile;

QAction *save;

QAction *saveAs;

QAction *printText;

QAction *exit;

QAction *undoAction;//撤销

QAction *redoAction;//恢复

QAction *copy;

QAction *cut;

QAction *paste;

QAction *insertImg;

QAction *insertTable;

QAction *find;

QAction *about;

QAction *aboutQt;

QAction *bold;

QAction *italic;

QAction *underLine;

QAction *color;

QAction *left;

QAction *center;

QAction *right;

QAction *justify;

QActionGroup *group;

QLabel *fontLabel;

QLabel *fontSizeLabel;

QFontComboBox *fontCom;

QComboBox *fontSizeCom;

QString fileName;

QLineEdit *lineEdit;

QLabel *label;

QPushButton *btn;

QVBoxLayout *layout;

QLineEdit *column;

QLineEdit *row;

private slots:

void findNext();

void NewFile();

void OpenFile();

void Save();

void SaveAs();

void Color();

void Bold();

void Italic();

void UnderLine();

void ALignment(QAction *);

void PrintText();

void InsertImage();

void InsertTable();

void mergeFormat(QTextCharFormat);

void FontComBox(QString fontComStr);

void FontSizeCom(QString fontSizeStr);

void Find();

void About();

void AboutQt();

void showCurrentCharFormatChanged(const QTextCharFormat &form);

};

#endif // MAINWINDOW_H

Qt4系列之开发文本编辑器

mainwindow.cpp:

#include "mainwindow.h"

#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :

QMainWindow(parent),

ui(new Ui::MainWindow)

{

ui->setupUi(this);

QTextCodec::setCodecForTr(QTextCodec::codecForLocale());

setWindowIcon(QIcon(":/images/textEditor.png"));

setWindowTitle(tr("Qt文本编辑器"));

textEdit = new QTextEdit();

setCentralWidget(textEdit);

createAction();//创建动作

createMenu();//创建菜单

createToolBar();//创建工具栏

//文件菜单的动作与槽的连接

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

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

connect(save,SIGNAL(triggered()),this,SLOT(Save()));

connect(saveAs,SIGNAL(triggered()),this,SLOT(SaveAs()));

connect(exit,SIGNAL(triggered()),this,SLOT(close()));

//编辑菜单的动作与槽的连接

connect(cut,SIGNAL(triggered()),textEdit,SLOT(cut()));

connect(copy,SIGNAL(triggered()),textEdit,SLOT(copy()));

connect(paste,SIGNAL(triggered()),textEdit,SLOT(paste()));

connect(undoAction,SIGNAL(triggered()),textEdit,SLOT(undo()));

connect(redoAction,SIGNAL(triggered()),textEdit,SLOT(redo()));

//字体设置动作与槽的连接

connect(fontCom,SIGNAL(activated(QString)),this,

SLOT(FontComBox(QString)));

//字号设置动作与槽的连接

connect(fontSizeCom,SIGNAL(activated(QString)),this,SLOT(FontSizeCom(QString)));

connect(textEdit,SIGNAL(currentCharFormatChanged(QTextCharFormat&)),

this,SLOT(showCurrentCharFormatChanged(QTextCharFormat&)));

//颜色编辑动作与槽的连接

connect(color,SIGNAL(triggered()),this,SLOT(Color()));

//格式菜单动作与槽的连接

connect(bold,SIGNAL(triggered()),this,SLOT(Bold()));

connect(italic,SIGNAL(triggered()),this,SLOT(Italic()));

connect(underLine,SIGNAL(triggered()),this,SLOT(UnderLine()));

connect(group,SIGNAL(triggered(QAction*)),this,SLOT(ALignment(QAction *)));

//插入菜单动作与槽的连接

connect(insertImg,SIGNAL(triggered()),this,SLOT(InsertImage()));

connect(insertTable,SIGNAL(triggered()),this,SLOT(InsertTable()));

//打印动作与槽的连接

connect(printText,SIGNAL(triggered()),this,SLOT(PrintText()));

//查找菜单动作与槽的连接

connect(find,SIGNAL(triggered()),this,SLOT(Find()));

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

connect(aboutQt,SIGNAL(triggered()),this,SLOT(AboutQt()));

resize(1000,600);

}

//创建动作

void MainWindow::createAction(){

QTextCodec::setCodecForTr(QTextCodec::codecForLocale());

//新建文件

newFile = new QAction(QIcon(":/images/new.png"),tr("新建文件"),this);

newFile->setShortcut(tr("Ctrl+N"));

newFile->setStatusTip(tr("新建一个文件"));

//打开文件

openFile = new QAction(QIcon(":/images/open.png"),tr("打开文件"),this);

openFile->setShortcut(tr("Ctrl+O"));

openFile->setStatusTip(tr("打开一个文件"));

//保存文件

save = new QAction(QIcon(":/images/save.png"),tr("保存"),this);

save->setShortcut(tr("Ctrl+S"));

save->setStatusTip(tr("保存文件"));

//另存为

saveAs = new QAction(QIcon(":/images/saveAs.png"),tr("另存为"),this);

saveAs->setShortcut(tr("Ctrl+A"));

saveAs->setStatusTip(tr("文件另存为"));

//打印

printText = new QAction(QIcon(":/images/printText.png"),tr("打印"),this);

printText->setShortcut(tr("Ctrl+P"));

printText->setStatusTip(tr("打印"));

//退出

exit = new QAction(QIcon(":/images/exit.png"),tr("退出"),this);

exit->setShortcut(tr("Ctrl+E"));

exit->setStatusTip(tr("退出"));

//恢复

redoAction = new QAction(QIcon(":/images/redo.png"),tr("恢复"),this);

redoAction->setShortcut(tr("Ctrl+R"));

redoAction->setStatusTip(tr("恢复"));

//撤销

undoAction = new QAction(QIcon(":/images/undo.png"),tr("撤销"),this);

undoAction->setShortcut(tr("Ctrl+U"));

undoAction->setStatusTip(tr("撤销"));

//剪切

cut = new QAction(QIcon(":/images/cut.png"),tr("剪切"),this);

cut->setShortcut(tr("Ctrl+X"));

cut->setStatusTip(tr("剪切"));

//复制

copy = new QAction(QIcon(":/images/copy.png"),tr("复制"),this);

copy->setShortcut(tr("Ctrl+C"));

copy->setStatusTip(tr("复制"));

//粘贴

paste = new QAction(QIcon(":/images/paste.png"),tr("黏贴"),this);

paste->setShortcut(tr("Ctrl+P"));

paste->setStatusTip(tr("粘贴"));

//粗体

bold = new QAction(QIcon(":/images/bold.png"),tr("粗体"),this);

bold->setStatusTip(tr("粗体字"));

bold->setCheckable(true);

//斜体

italic = new QAction(QIcon(":/images/italic.png"),tr("斜体"),this);

italic->setStatusTip(tr("斜体字"));

italic->setCheckable(true);

//下划线

underLine = new QAction(QIcon(":/images/underline.png"),tr("下划线"),this);

underLine->setStatusTip(tr("下划线"));

underLine->setCheckable(true);

//颜色

color = new QAction(QIcon(":/images/color.png"),tr("颜色"),this);

color->setShortcut(tr("Ctrl+C"));

color->setStatusTip(tr("颜色编辑"));

group = new QActionGroup(this);

//左对齐

left = new QAction(QIcon(":/images/left.png"),tr("左对齐"),group);

left->setStatusTip(tr("左对齐"));

left->setCheckable(true);

//居中

center = new QAction(QIcon(":/images/center.png"),tr("居中对齐"),group);

center->setStatusTip(tr("居中对齐"));

center->setCheckable(true);

//右对齐

right = new QAction(QIcon(":/images/right.png"),tr("右对齐"),group);

right->setStatusTip(tr("右对齐"));

right->setCheckable(true);

//两端对齐

justify = new QAction(QIcon(":/images/justify.png"),tr("两端对齐"),group);

justify->setStatusTip(tr("两端对齐"));

justify->setCheckable(true);

group->addAction(left);

group->addAction(center);

group->addAction(right);

group->addAction(justify);

//插入图片

insertImg = new QAction(QIcon(":/images/image.png"),tr("插入图片"),this);

insertImg->setStatusTip(tr("插入图片"));

//插入表格

insertTable = new QAction(QIcon(":/images/table.png"),tr("插入表格"),this);

insertTable->setStatusTip(tr("插入表格"));

//查找

find = new QAction(QIcon(":/images/find.png"),tr("查找"),this);

find->setShortcut(tr("Ctrl+F"));

find->setStatusTip(tr("查找"));

//关于

about = new QAction(QIcon(":/images/about.png"),tr("关于"),this);

about->setStatusTip(tr("关于"));

//字体

fontLabel = new QLabel(tr("字体"));

fontCom = new QFontComboBox();

fontCom->setFontFilters(QFontComboBox::ScalableFonts);

fontCom->setStatusTip(tr("字体设置"));

//字号

fontSizeLabel = new QLabel(tr("字号"));

QFontDatabase db;

fontSizeCom = new QComboBox();

foreach(int size,db.standardSizes())

fontSizeCom->addItem(QString::number(size));

fontSizeCom->setStatusTip(tr("字号设置"));

//关于

aboutQt = new QAction(tr("关于QT"),this);

aboutQt->setStatusTip(tr("关于Qt"));

}

//创建菜单

void MainWindow::createMenu(){

//文件菜单

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

file->addAction(newFile);

file->addAction(openFile);

file->addSeparator();

file->addAction(save);

file->addAction(saveAs);

file->addSeparator();

file->addAction(printText);

file->addSeparator();

file->addAction(exit);

//编辑菜单

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

edit->addAction(undoAction);

edit->addAction(redoAction);

edit->addSeparator();

edit->addAction(cut);

edit->addAction(copy);

edit->addAction(paste);

//插入菜单

insert = menuBar()->addMenu(tr("插入(&I)"));

insert->addAction(insertImg);

insert->addAction(insertTable);

//查找菜单

search = menuBar()->addMenu(tr("查找(&F)"));

search->addAction(find);

//格式菜单

style = menuBar()->addMenu(tr("格式(&S)"));

style->addAction(bold);

style->addAction(italic);

style->addAction(underLine);

style->addSeparator();

style->addAction(color);

style->addSeparator();

style->addAction(left);

style->addAction(center);

style->addAction(right);

style->addAction(justify);

//帮助菜单

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

help->addAction(about);

help->addAction(aboutQt);

}

//创建工具栏

void MainWindow::createToolBar(){

//文件

fileToolBar = addToolBar(tr("文件(&N)"));

fileToolBar->addAction(newFile);

fileToolBar->addAction(openFile);

fileToolBar->addSeparator();

fileToolBar->addAction(save);

fileToolBar->addAction(saveAs);

fileToolBar->addSeparator();

fileToolBar->addAction(printText);

fileToolBar->addSeparator();

//编辑

editToolBar = addToolBar(tr("编辑(&E)"));

editToolBar->addAction(undoAction);

editToolBar->addAction(redoAction);

editToolBar->addSeparator();

editToolBar->addAction(cut);

editToolBar->addAction(copy);

editToolBar->addAction(paste);

//格式

styleToolBar = addToolBar(tr("格式(&S)"));

styleToolBar->addAction(bold);

styleToolBar->addAction(italic);

styleToolBar->addAction(underLine);

styleToolBar->addSeparator();

styleToolBar->addAction(left);

styleToolBar->addAction(center);

styleToolBar->addAction(right);

styleToolBar->addAction(justify);

styleToolBar->addSeparator();

styleToolBar->addWidget(fontLabel);

styleToolBar->addWidget(fontCom);

styleToolBar->addWidget(fontSizeLabel);

styleToolBar->addWidget(fontSizeCom);

//插入

insertToolBar = addToolBar(tr("插入(&I)"));

insertToolBar->addAction(insertImg);

insertToolBar->addAction(insertTable);

insertToolBar->addSeparator();

//查找

searchToolBar = addToolBar(tr("查找(&F)"));

searchToolBar->addAction(find);

search->addSeparator();

}

//封装的读文件,用于精简程序

void MainWindow::fileRead(){

QFile file(fileName);

if(!file.open(QFile::ReadOnly|QFile::Text)){

QMessageBox::warning(this,tr("多文档编辑器"),

tr("不可以打开文件%1:\n%2").arg(fileName).arg(file.errorString()));

return;

}

QTextStream in(&file);

QApplication::setOverrideCursor(Qt::WaitCursor);

textEdit->setPlainText(in.readAll());

QApplication::restoreOverrideCursor();

}

//封装的写文件,用于精简程序

void MainWindow::fileWrite(){

QFile file(fileName);

if(!file.open(QFile::WriteOnly|QFile::Text)){

QMessageBox::warning(this,tr("多文档编辑器"),

tr("不可以写入文件%1:/n%2").arg(fileName).arg(file.errorString()));

return;

}

QTextStream out(&file);

QApplication::setOverrideCursor(Qt::WaitCursor);

out<toPlainText();

QApplication::restoreOverrideCursor();

return;

}

//新建文件

void MainWindow::NewFile(){

MainWindow *newEdit = new MainWindow;

newEdit->show();

}

//打开文件

void MainWindow::OpenFile(){

fileName = QFileDialog::getOpenFileName(this,tr("打开文件"),"/","allFile(*.*)");

if(!fileName.isEmpty()){

if(textEdit->document()->isEmpty()){

fileRead();

}else{

MainWindow *newEdit = new MainWindow;

newEdit->show();

QFile file(fileName);

if(!file.open(QFile::ReadOnly|QFile::Text)){

QMessageBox::warning(this,tr("多文档编辑器"),

tr("不可以打开文件%1:\n%2").arg(fileName).arg(file.errorString()));

return;

}

QTextStream in(&file);

QApplication::setOverrideCursor(Qt::WaitCursor);

newEdit->textEdit->setPlainText(in.readAll());

QApplication::restoreOverrideCursor();

}

//保存文件

void MainWindow::Save(){

if(fileName.isEmpty()){

fileName = QFileDialog::getSaveFileName(this,tr("另存为"),tr("未命名.txt"));

fileWrite();

}else{

fileWrite();

}

//另存为

void MainWindow::SaveAs(){

fileName = QFileDialog::getSaveFileName(this,tr("另存为"),tr("未命名.txt"));

fileWrite();

}

//字体设置

void MainWindow::FontComBox(QString fontComStr){

QTextCharFormat format;

format.setFontFamily(fontComStr);

mergeFormat(format);

}

void MainWindow::mergeFormat(QTextCharFormat format){

QTextCursor cursor = textEdit->textCursor();

if(!cursor.hasSelection())

cursor.select(QTextCursor::WordUnderCursor);

cursor.mergeCharFormat(format);

textEdit->mergeCurrentCharFormat(format);

}

//字号设置

void MainWindow::FontSizeCom(QString fontSizeStr){

QTextCharFormat format;

format.setFontPointSize(fontSizeStr.toFloat());

textEdit->mergeCurrentCharFormat(format);

}

//颜色设置

void MainWindow::Color(){

QColor color = QColorDialog::getColor(Qt::blue,this);

if(color.isValid()){

QTextCharFormat format;

format.setForeground(color);

textEdit->mergeCurrentCharFormat(format);

}

//粗体

void MainWindow::Bold(){

QTextCharFormat format;

format.setFontWeight(bold->isChecked()?QFont::Bold:QFont::Normal);

textEdit->mergeCurrentCharFormat(format);

}

//斜体

void MainWindow::Italic(){

QTextCharFormat format;

format.setFontItalic(italic->isChecked());

textEdit->mergeCurrentCharFormat(format);

}

//下划线

void MainWindow::UnderLine(){

QTextCharFormat format;

format.setFontUnderline(underLine->isChecked());

textEdit->mergeCurrentCharFormat(format);

}

//对齐

void MainWindow::ALignment(QAction *act){

if(act == left){

textEdit->setAlignment(Qt::AlignLeft);

}else if(act == center){

textEdit->setAlignment(Qt::AlignCenter);

}else if(act == right){

textEdit->setAlignment(Qt::AlignRight);

}else if(act == justify){

textEdit->setAlignment(Qt::AlignJustify);

}

//插入图片

void MainWindow::InsertImage(){

QTextCursor cursor = textEdit->textCursor();

QTextImageFormat format;

QString image = QFileDialog::getOpenFileName(this,"insert image","/","png(*.png)");

format.setName(image);

cursor.insertImage(format);

}

//插入表格,用到输入对话框

void MainWindow::InsertTable(){

bool ok;

int a = QInputDialog::getInt(this,tr("插入表格"),tr("输入行数:"),0,0,300,1,&ok);

int b = QInputDialog::getInt(this,tr("插入表格"),tr("输入列数:"),0,0,300,1,&ok);

if(ok){

QTextCursor cursor = textEdit->textCursor();

QTextTableFormat format;

format.setCellSpacing(0);

format.setCellPadding(30);

cursor.insertTable(a,b,format);

}

//查找

void MainWindow::Find(){

QDialog *dialog = new QDialog(this);

dialog->setWindowTitle(tr("查找"));

lineEdit = new QLineEdit(dialog);

label = new QLabel(this);

btn = new QPushButton(dialog);

btn->setText(tr("下一个"));

connect(btn,SIGNAL(clicked()),this,SLOT(findNext()));

layout = new QVBoxLayout();

layout->addWidget(lineEdit);

layout->addWidget(btn);

dialog->setLayout(layout);

dialog->resize(60,60);

dialog->show();

}

void MainWindow::findNext(){

QString str = lineEdit->text();

bool isfind = textEdit->find(str,QTextDocument::FindBackward);

if(isfind){

label->setText(tr("查找目标在,行号:%1 列号:%2!").arg(textEdit->textCursor().blockNumber()).arg(textEdit->textCursor().columnNumber()));

ui->statusBar->addPermanentWidget(label);

}

//打印

void MainWindow::PrintText(){

QPrinter printer;

QPrintDialog printDialog(&printer,this);

if(printDialog.exec()){

QTextDocument *textDocument = textEdit->document();

textDocument->print(&printer);

}

//帮助

void MainWindow::About(){

QMessageBox::about(this,tr("关于"),tr("这是一个文本编辑器"));

}

void MainWindow::AboutQt(){

QMessageBox::aboutQt(this,tr("Qt编辑器"));

}

void MainWindow::showCurrentCharFormatChanged(const QTextCharFormat &form){

fontCom->setCurrentIndex(fontCom->findText(form.fontFamily()));

fontSizeCom->setCurrentIndex(fontSizeCom->findText(QString::number(form.fontPointSize())));

bold->setChecked(form.font().bold());

italic->setChecked(form.font().italic());

underLine->setChecked(form.font().underline());

}

MainWindow::~MainWindow()

{

delete ui;

}

main.cpp:

#include

#include "mainwindow.h"

int main(int argc, char *argv[])

{

QApplication a(argc, argv);

MainWindow w;

w.show();

return a.exec();

}

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