qt文本编辑器

示例代码：

mainwindow.cpp

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include <QtGui>

MainWindow::MainWindow(QWidget *parent) :

QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    isSaved =false;

    curFile = tr("未命名.txt");

    setWindowTitle(curFile);

    init_statusBar();

}



MainWindow::~MainWindow()

{

    delete ui;

}





void MainWindow::do_file_New()

{

    do_file_SaveOrNot();

    isSaved = false;

    curFile = tr("未命名.txt");

    setWindowTitle(curFile);

    ui->textEdit->clear();//清空文本编辑器

    ui->textEdit->setVisible(true);//文本编辑器可见

}



void MainWindow::do_file_SaveOrNot()

{

    if(ui->textEdit->document()->isModified()) //如果文件被更改过，弹出保存对话框

    {

        QMessageBox box;

        box.setWindowTitle(tr("警告"));

        box.setIcon(QMessageBox::Warning);

        box.setText(curFile+tr("尚未保存，是否保存？"));

        box.setStandardButtons(QMessageBox::Yes|QMessageBox::No);

        if(box.exec() == QMessageBox::Yes)

            do_file_Save();

    }

}



void MainWindow::do_file_Save()

{

    if(isSaved)

    {

        saveFile(curFile);

    }

    else

    {

        do_file_SaveAs();

    }

}



void MainWindow::do_file_SaveAs()

{

  //  QString fileName = QFileDialog::getSaveFileName(this,tr("另存为")，curFile);

      QString fileName = QFileDialog::getSaveFileName(this,tr("另存为"),curFile);



    if(!fileName.isEmpty())

    {

        saveFile(fileName);

    }



}



bool MainWindow::saveFile(const QString &fileName)

{

    QFile file(fileName);

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

    {

        QMessageBox::warning(this,tr("保存文件"),

        tr("无法保存文件 %1:\n %2").arg(fileName)

        .arg(file.errorString()));



        return false;

    }



    QTextStream out(&file);

    out<<ui->textEdit->toPlainText();

    isSaved = true;

    curFile = QFileInfo(fileName).canonicalFilePath();

    setWindowTitle(curFile);

    return true;

}





void MainWindow::do_file_Open()

{

    do_file_SaveOrNot();

    QString fileName = QFileDialog::getOpenFileName(this);

    if(!fileName.isEmpty())

    {

        do_file_Load(fileName);

    }



    ui->textEdit->setVisible(true);//文本编辑器可见

}



bool MainWindow::do_file_Load(const QString &fileName)

{

    QFile file(fileName);

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

    {

        QMessageBox::warning(this,tr("读取文件"),tr("无法读取文件 %1:\n%2").arg(fileName).arg(file.errorString()));

        return false;

    }



    QTextStream in(&file);

    ui->textEdit->setText(in.readAll());

    curFile = QFileInfo(fileName).canonicalFilePath();

    setWindowTitle(curFile);

    return true;



}



void MainWindow::on_action_N_triggered()

{

    do_file_New();

}



void MainWindow::on_action_S_triggered()

{

    do_file_Save();

}



void MainWindow::on_action_2_triggered()

{

    do_file_SaveAs();

}



void MainWindow::on_action_O_triggered()

{

    do_file_Open();

}



void MainWindow::on_action_C_triggered()

{

    do_file_SaveOrNot();

    ui->textEdit->setVisible(false);

}







void MainWindow::on_action_X_triggered()

{

    on_action_C_triggered();

    qApp->quit();

}



void MainWindow::on_action_Z_triggered()

{

    ui->textEdit->undo();

}



void MainWindow::on_action_X_2_triggered()

{

    ui->textEdit->cut();

}



void MainWindow::on_action_C_2_triggered()

{

    ui->textEdit->copy();

}



void MainWindow::on_action_V_triggered()

{

    ui->textEdit->paste();

}



void MainWindow::on_action_F_triggered()

{

    QDialog *findDlg = new QDialog(this);

    findDlg ->setWindowTitle(tr("查找"));

    find_textLineEdit = new QLineEdit(findDlg);

    QPushButton *find_Btn = new QPushButton(tr("查找下一个"),findDlg);

    QVBoxLayout *layout = new  QVBoxLayout(findDlg);

    layout ->addWidget(find_textLineEdit);

    layout->addWidget(find_Btn);

    findDlg ->show();

    //显示对话框

    connect(find_Btn,SIGNAL(clicked()),this,SLOT(show_findText()));





}





void MainWindow::show_findText()

{

    QString findText = find_textLineEdit->text();

    ui->textEdit->find(findText,QTextDocument::FindBackward);

    if(!ui->textEdit->find(findText,QTextDocument::FindBackward))

    {

        QMessageBox::warning(this,tr("查找"),tr("找不到 %1").arg(findText));

    }



}



void MainWindow::init_statusBar()

{

    QStatusBar*bar = ui->statusBar;

    first_statusLabel = new QLabel;

    first_statusLabel -> setMinimumSize(150,20);

    first_statusLabel -> setFrameShape(QFrame::WinPanel);

    first_statusLabel -> setFrameShadow(QFrame::Sunken);

    second_statusLabel = new QLabel;

    second_statusLabel->setMinimumSize(150,20);

    second_statusLabel ->setFrameShape(QFrame::WinPanel);



    second_statusLabel->setFrameShadow(QFrame::Sunken);

    bar ->addWidget(first_statusLabel);

    bar->addWidget(second_statusLabel);

    first_statusLabel->setText(tr("欢迎使用文本编辑器"));

    second_statusLabel->setText("yafeilinux 制作！");



}