mainwindow.h
核心函数
- QFileDialog::getOpenFileName()
- QFileDialog::getSaveFileName()
#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include<QFileDialog>
#include<QMessageBox>
#include<QDebug>
#include<QFile>
#include<QKeyEvent>
#include<QMouseEvent>QT_BEGIN_NAMESPACE
namespace Ui {
class MainWindow;
}
QT_END_NAMESPACEclass MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent = nullptr);void keyPressEvent(QKeyEvent *k);void mousePressEvent(QMouseEvent *m);~MainWindow();private:Ui::MainWindow *ui;
private slots:void newActionSlot();void openActionSlot();void saveActionSlot();
};
#endif
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);this->setWindowTitle("记事本");connect(ui->newAction,&QAction::triggered,this,&MainWindow::newActionSlot);connect(ui->openAction,&QAction::triggered,this,&MainWindow::openActionSlot);connect(ui->saveAction,&QAction::triggered,this,&MainWindow::saveActionSlot);
}MainWindow::~MainWindow()
{delete ui;
}
void MainWindow::newActionSlot()
{
ui->textEdit->clear();this->setWindowTitle("新建文本文档.txt");
}
void MainWindow::openActionSlot()
{
QString filename= QFileDialog::getOpenFileName(this, "打开文件",QCoreApplication::applicationFilePath(), "*.cpp");if(filename.isEmpty()){QMessageBox::warning(this,"警告","请打开一个文件!");}else{QFile file(filename);file.open(QIODevice::ReadOnly);QByteArray ba = file.readAll();file.close();ui->textEdit->setText(QString(ba));}
}
void MainWindow::saveActionSlot()
{
QString filename=QFileDialog::getSaveFileName(this,"保存文件",QCoreApplication::applicationFilePath());if(filename.isEmpty())QMessageBox::warning(this,"警告","请选择一个文件!");else{QFile file(filename);file.open(QIODevice::WriteOnly);QByteArray ba;ba.append(ui->textEdit->toPlainText().toUtf8());file.write(ba);file.close();QMessageBox::about(this,"提示","保存成功");}
}void MainWindow::keyPressEvent(QKeyEvent *k)
{
if(k->modifiers()==Qt::ControlModifier&&k->key()==Qt::Key_S)saveActionSlot();
}void MainWindow::mousePressEvent(QMouseEvent *m)
{QPoint pt = m->pos();qDebug()<<pt;if(m->button()==Qt::LeftButton)qDebug()<<"左键被按下";else if(m->button()==Qt::RightButton)qDebug()<<"右键被按下";
}