QT 实现 记事本功能, 基于普通记事本基础上对功能略加改动

#include "mainwindow.h" #include "ui_mainwindow.h" #include <QT> #include<QTimer> #include<QDateTime> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); this->setWindowTitle("记事本"); isChange = 0;//当文件被修改才会为1 newfile = 1;//当是保存已有的文件时才会为0 val = 0; //匿名对象 this->setWindowIcon(QIcon("://pic/notepad.png")); //状态栏时间 timelabel = new QLabel; // 创建QLabel控件 ui->statusBar->addWidget(timelabel); //在状态栏添加此控件 QTimer *timer = new QTimer(this); timer->start(1000); //每隔1000ms发送timeout的信号 connect(timer, SIGNAL(timeout()),this,SLOT(time_update())); //状态栏鼠标 QMainWindow开启鼠标需要分两步 //1.先把QMainWindow的CentrolWidget移动监视开启 //2.再开启QMainWindow的鼠标 ui->centralWidget->setMouseTracking(true); this->setMouseTracking(true); lable = new QLabel; lable->resize(100, 30); ui->statusBar->addPermanentWidget(lable); } MainWindow::~MainWindow() { delete ui; } //打开文件 void MainWindow::on_action_open_triggered() { newfile = 0; //打开文件对话框,选择文件 fileName = QFileDialog::getOpenFileName(this,\ tr("打开"), ".", tr("Text (*.c *.cpp *.txt *.png *.jpg *.bmp)"));//'.'为当前目录 //显示到状态栏 ui->statusBar->showMessage("will open"+fileName,3000); if(fileName.isEmpty()) { ui->statusBar->showMessage("选择文件失败"); return; } //打开文件 QFile file(fileName); bool ret = file.open(QIODevice::ReadOnly); if(!ret) { ui->statusBar->showMessage("打开文件失败");//statusBar状态栏 showMessage显示临时信息 return; } //读取文件内容 QByteArray buf = file.readAll(); //把字节流(QByteArray)转换为相应编码的QString(utf-8) //代表读出的 字节流 是utf-8编码,那么fromUtf8接口会按照Utf8编码转换为utf-8 QString str = QString::fromUtf8(buf); //代表读出的字节流是gbk编码，那么fromLocal8Bit接口会按照gbk编码转换为utf-8 //QString str = QString::fromLocal8Bit(buf); ui->textEdit->setText(QString(str));//QString()可以自动将QByteArray的类型转换为string类型 } //另存为 void MainWindow::on_action_save_at_triggered() { //打开 保存类型 的对话框 QString fileName = QFileDialog::getSaveFileName(this,\ tr("另存为"), "d:", tr("Text (*.c *.cpp *.txt *.png *.jpg *.bmp)")); //判断保存位置 if(fileName.isEmpty()) { ui->statusBar->showMessage("选择文件位置失败"); } //打开文件并保存 QFile file(fileName); bool ret = file.open(QIODevice::ReadWrite | QIODevice::Truncate);//读写和清空 if(!ret){ ui->statusBar->showMessage("文件位置不合法"); return; } //写 QString text = ui->textEdit->toPlainText(); QByteArray arr = text.toUtf8();//将QByteArray按照utf-8编码转换为QString //QByteArray buf = text.toLocal8Bit();////将QByteArray按照本地编码转换为QString file.write(arr);//写入 ui->statusBar->showMessage("保存成功",2000); } //退出记事本 void MainWindow::on_action_quit_triggered() { if(isChange == 0) this->close(); else { int ret = QMessageBox::question(NULL,"注意","文件还未保存,是否要保存"); if(ret == QMessageBox::Yes) //如果选择 保存 { if(newfile==1)//如果是新建的文件 { on_action_save_at_triggered();//另存为 } else { quick_save(fileName);//直接保存 } } else //不保存直接退出 this->close(); } } //保存 void MainWindow::on_action_save_triggered() { if(newfile==0) { quick_save(fileName);//直接用打开文件的文件名来保存 } else { on_action_save_at_triggered();//转到另存为 } } //用来直接保存的函数 void MainWindow::quick_save(const QString &sfileName) { QFile sFile(sfileName); if(!sFile.open(QIODevice::ReadWrite | QIODevice::Truncate)) return; QString text = ui->textEdit->toPlainText(); QByteArray arr = text.toUtf8();//将QByteArray按照utf-8编码转换为QString //QByteArray buf = text.toLocal8Bit();////将QByteArray按照本地编码转换为QString sFile.write(arr);//写入 ui->statusBar->showMessage("保存成功",2000); } //新建 void MainWindow::on_action_new_triggered() { if(isChange == 1) { int ret = QMessageBox::question(NULL,"注意","文件未被保存,需要保存吗"); if(ret ==QMessageBox::Yes) { on_action_save_at_triggered(); } } else { ui->textEdit->clear(); isChange = 1; newfile = 1; } } //创建新窗体 void MainWindow::on_action_window_triggered() { MainWindow * windows = new MainWindow; windows->show(); } //工具:日期时间 void MainWindow::on_action_data_triggered() { QFont font("Microsoft SimHei",10,10);//黑体 QDateTime time = QDateTime::currentDateTime();//获取当前时间 QString tim = time.toString("yyyy-MM-dd hh:mm:ss dddd");//格式 ui->textEdit->setFont(font); //字体 ui->textEdit->setText(tim); //时间内容 } //ctrl与鼠标滚轮 放大缩小 void MainWindow::wheelEvent(QWheelEvent *event) { if(QApplication::keyboardModifiers() == Qt::ControlModifier)//ctrl { if(event->delta() > 0) { font.setPixelSize(++val); ui->textEdit->setFont(font); } else { font.setPixelSize(--val); ui->textEdit->setFont(font); } } } //工具:搜索 void MainWindow::on_action_find_triggered() { find_word = new QDialog(this);//实例化对话框 find_word->setWindowTitle(tr("查找"));//该对话框标题 findLineEdit = new QLineEdit(find_word);//该文本框建立于对话框中 QPushButton *btn = new QPushButton(tr("查找下一个"),find_word); //垂直布局 对话框和按钮 QVBoxLayout * layout = new QVBoxLayout(find_word); layout->addWidget(findLineEdit); layout->addWidget(btn); QObject::connect(btn,SIGNAL(clicked()),this, SLOT(find_showSlot())); find_word->show(); } void MainWindow::find_showSlot() { qDebug() <<"开始搜索 "; QString part = findLineEdit->text(); bool ret = ui->textEdit->find(part,QTextDocument::FindWholeWords|QTextDocument::FindWholeWords);//QTextDocument:结构化副文本框容器 if(!ret) //FindBackWard向后搜索,FindWholeWords包含查找,若不指定该参数，默认的是向前查找、不区分大小写、整个单词查找而不是包含单词 { QMessageBox::warning(this,tr("查找结果"),tr("未找到%1").arg(part)); } } //工具:复制 void MainWindow::on_action_copy_triggered() { ui->textEdit->copy(); } //工具 剪贴 void MainWindow::on_action_cut_triggered() { ui->textEdit->cut(); } //工具 粘贴 void MainWindow::on_action_paste_triggered() { ui->textEdit->paste(); } //图片 void MainWindow::on_action_image_triggered() { //打开文件对话框,选择文件 fileName = QFileDialog::getOpenFileName(this,\ tr("打开"), "/", tr("Text (*.jpg .*png)"));//'.'为当前目录 //显示到状态栏 ui->statusBar->showMessage("will open"+fileName,3000); if(fileName.isEmpty()) {