项目全部代码，还包含使用到的图片

#include "widget.h" #include "ui_widget.h" #include <QFileDialog> #include <QDebug> #include <QMessageBox> #include <QShortcut> #include <QWheelEvent> Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { ui->setupUi(this); ui->textEdit->installEventFilter(this); QShortcut *shortcutOpen = new QShortcut(QKeySequence(tr("Ctrl+O", "File|Open")),this); QShortcut *shortcutSave = new QShortcut(QKeySequence(tr("Ctrl+S", "File|Save")),this); QShortcut *shortcutZoomIn = new QShortcut(QKeySequence(tr("Ctrl+Shift+=", "File|Save")),this); QShortcut *shortcutZoomOut = new QShortcut(QKeySequence(tr("Ctrl+Shift+-", "File|Save")),this); connect(shortcutOpen,&QShortcut::activated,[=](){ on_openButton_clicked(); }); connect(shortcutSave,&QShortcut::activated,[=](){ on_saveButton_clicked(); }); connect(shortcutZoomIn,&QShortcut::activated,[=](){ zoomIn(); }); connect(shortcutZoomOut,&QShortcut::activated,[=](){ zoomOut(); }); //虽然上面一行代码进行widget和ui的窗口关联，但是如果发生窗口大小变化的时候，里面的布局不会随之变化 //通过下面这行代码进行显示说明，让窗口变化时，布局及其子控件随之调整 this->setLayout(ui->verticalLayout); connect(ui->comboBox,SIGNAL(currentIndexChanged(int)),this,SLOT(onCurrentIndexChanged(int))); connect(ui->textEdit,SIGNAL(cursorPositionChanged()),this,SLOT(onCursorPositionChanged())); } Widget::~Widget() { delete ui; } void Widget::zoomIn() { //获得TextEdit的当前字体信息 QFont font = ui->textEdit->font(); //获得当前字体的大小 int fontSize = font.pointSize(); if(fontSize == -1) return; //改变大小，并设置字体大小 int newFontSize = fontSize+1; font.setPointSize(newFontSize); ui->textEdit->setFont(font); } void Widget::zoomOut() { //获得TextEdit的当前字体信息 QFont font = ui->textEdit->font(); //获得当前字体的大小 int fontSize = font.pointSize(); if(fontSize == -1) return; //改变大小，并设置字体大小 int newFontSize = fontSize-1; font.setPointSize(newFontSize); ui->textEdit->setFont(font); } bool Widget::eventFilter(QObject *watched, QEvent *event) { /* QKeyEvent *keyEvent = (QKeyEvent*)event; if(keyEvent->key() == Qt::Key_Control){ qDebug() << "Ctrl"; } */ if(event->type() == QEvent::Wheel){ if(QGuiApplication::keyboardModifiers() == Qt::ControlModifier){ QWheelEvent *wheelEvent = dynamic_cast<QWheelEvent*>(event); if(wheelEvent->angleDelta().y() > 0){ zoomIn(); }else if(wheelEvent->angleDelta().y()<0){ zoomOut(); } return true; } return false; } } void Widget::on_openButton_clicked() { QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"), "F:/myqt/project_of_qt_new", tr("Text (*.txt)")); ui->textEdit->clear(); file.setFileName(fileName); if(!file.open(QIODevice::ReadWrite | QIODevice::Text)){ qDebug() << "file open error"; } this->setWindowTitle(fileName + "- MyNoteBook"); QTextStream in(&file); QString str = ui->comboBox->currentText();//把QString转化成char * const char* c_str = str.toStdString().c_str(); in.setCodec(c_str); while(!in.atEnd()){ QString context = in.readLine(); ui->textEdit->append(context); } } void Widget::on_saveButton_clicked() { if(!file.isOpen()){ QString fileName = QFileDialog::getSaveFileName(this, tr("Save File"), "F:/myqt/project_of_qt_new", tr("Text (*.txt *.doc)")); file.setFileName(fileName); if(!file.open(QIODevice::WriteOnly | QIODevice::Text)){ qDebug() << "file open error"; } this->setWindowTitle(fileName + "- MyNoteBook"); } else { file.resize(0);//对于已经打开的文件要先清空再添加, 不然追加到后面就出错啦 } QTextStream out(&file); out.setCodec(ui->comboBox->currentText().toStdString().c_str()); QString context = ui->textEdit->toPlainText(); out << context; } void Widget::on_closeButton_clicked() { QMessageBox msgBox; int ret = QMessageBox::warning(this, tr("MyNoteBook Notice:"), tr("The document has been modified.\n" "Do you want to save your changes?"), QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel, QMessageBox::Save); switch (ret) { case QMessageBox::Save: // Save was clicked on_saveButton_clicked(); qDebug() << "QMessageBox::Save:"; break; case QMessageBox::Discard: // Don't Save was clicked ui->textEdit->clear(); if(file.isOpen()){ file.close(); this->setWindowTitle("MyNoteBook"); } qDebug() << "QMessageBox::Discard:"; break; case QMessageBox::Cancel: // Cancel was clicked qDebug() << "QMessageBox::Cancel:"; break; default: // should never be reached break; } } void Widget::onCurrentIndexChanged(int index) { qDebug() << "currentItSignal"; ui->textEdit->clear(); if(file.isOpen()){ qDebug() << "file is Open"; QTextStream in(&file); in.setCodec(ui->comboBox->currentText().toStdString().c_str()); file.seek(0); while(!in.atEnd()){ QString context = in.readLine(); ui->textEdit->append(context); } } } void Widget::cursorPositionChanged() { QTextCursor cursor = ui->textEdit->textCursor(); //qDebug() << cursor.blockNumber()+1 <<","<< cursor.columnNumber() + 1; QString blockNum = QString::number(cursor.blockNumber()+1); QString columnNum = QString::number(cursor.columnNumber()+1); const QString labelMes = "L:"+blockNum+",C:"+columnNum+" "; //const QString labelMes = "行:"+blockNum+",列:"+columnNum+" "; ui->labelLR->setText(labelMes); //设置当前行高亮 QList<QTextEdit::ExtraSelection> extraSelections; QTextEdit::ExtraSelection ext; //1. 知道当前行 ext.cursor = cursor; QBrush qBrush(Qt::lightGray); //2. 颜色 ext.format.setBackground(qBrush); //配置段属性：整行显示，没有这句话不行 ext.format.setProperty(QTextFormat::FullWidthSelection, true); //ext.format.setFontUnderline(true); //3. 设置 //把ext加到ext的容器中 extraSelections.append(ext); ui->textEdit->setExtraSelections(extraSelections); }