Qt学习（二）------实例mynotepad制作

一、Qt学习

二、关键代码

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
this->setWindowTitle("Untitled.txt-------------------yanqiang");
this->setWindowIcon(QIcon(":new/icon/txt"));
//File Menu
QObject::connect(ui->newAction,SIGNAL(triggered()),this ,SLOT(newFileSlot()));
QObject::connect(ui->openAction,SIGNAL(triggered()),this,SLOT(openFileSlot()));
QObject::connect(ui->saveAction,SIGNAL(triggered()),this,SLOT(saveFileSlot()));
QObject::connect(ui->exitAction,SIGNAL(triggered()),this,SLOT(close()));
//Edit Menu
QObject::connect(ui->undoAction,SIGNAL(triggered()),ui->textEdit,SLOT(undo()));
QObject::connect(ui->redoAction,SIGNAL(triggered()),ui->textEdit,SLOT(redo()));
QObject::connect(ui->copyAction,SIGNAL(triggered()),ui->textEdit,SLOT(copy()));
QObject::connect(ui->cutAction,SIGNAL(triggered()),ui->textEdit,SLOT(cut()));
QObject::connect(ui->pasteAction,SIGNAL(triggered()),ui->textEdit,SLOT(paste()));
QObject::connect(ui->selectAllAction,SIGNAL(triggered()),ui->textEdit,SLOT(selectAll()));

QObject::connect(ui->fontAction,SIGNAL(triggered()),this,SLOT(setFontSlot()));
QObject::connect(ui->colorAction,SIGNAL(triggered()),this,SLOT(setColorSlot()));
QObject::connect(ui->datetimeAction,SIGNAL(triggered()),this,SLOT(currentDateTimeSlot()));

//Help Menu
QObject::connect(ui->aboutQtAction,SIGNAL(triggered()),qApp,SLOT(aboutQt()));
QObject::connect(ui->aboutWebAction,SIGNAL(triggered()),this,SLOT(aboutWebSiteSlot()));
QObject::connect(ui->aboutSoftWareAction,SIGNAL(triggered()),this,SLOT(aboutSoftWareSlot()));

}

void MainWindow::closeEvent(QCloseEvent *event){
//忽略事件
//event->ignore();
//event->accept();
if(ui->textEdit->document()->isModified()){
QMessageBox msgBox;
//显示的提示信息
msgBox.setText("文本已经变更");
msgBox.setInformativeText("您是否要保存文件");
msgBox.setStandardButtons(QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
msgBox.setDefaultButton(QMessageBox::Save);
int ret = msgBox.exec();

switch (ret) {
case QMessageBox::Save:
// Save was clicked
this->saveFileSlot();
break;
case QMessageBox::Discard:
// Don't Save was clicked
event->accept();
break;
case QMessageBox::Cancel:
// Cancel was clicked
event->ignore();
break;
default:
// should never be reached
break;
}
}
else{
event->accept();
}
}

MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::newFileSlot(){
//Content is modified
if(ui->textEdit->document()->isModified())
{
qDebug()<<"File is modified";
}
else{
//qDebug()<<"File is not modified";
ui->textEdit->clear();
this->setWindowTitle("Untitled.txt------------yanqinag");
}
}

void MainWindow::openFileSlot(){
//Get File Name
QString fileName=QFileDialog::getOpenFileName(this,"Open File",QDir::currentPath());
//qDebug()<<"fileName is:"<<fileName;
if(fileName.isEmpty()){
QMessageBox::information(this,"Error Message","Select A File");
return;
}
QFile *file=new QFile;
file->setFileName(fileName);
bool ok=file->open(QIODevice::ReadOnly);
if(ok){
//File With QTextStream
QTextStream in(file);
ui->textEdit->setText(in.readAll());//get content from file
file->close();
delete file;
}
else {
QMessageBox::information(this,"Error Message","Fail To Open File"+file->errorString());
return;
}
}

//save file
void MainWindow::saveFileSlot(){
if(saveFileName.isEmpty()){
this->saveAsFileSlot();
}
else{
QFile *file=new QFile;
file->setFileName(saveFileName);
bool ok=file->open(QIODevice::WriteOnly);
if(ok){
QTextStream out(file);
out<<ui->textEdit->toPlainText();//这里去除textEdit的纯文本
file->close();
delete file;
}
}
}
//save as
void MainWindow::saveAsFileSlot(){
//使用getSaveFileName方法
QString saveFileName=QFileDialog::getSaveFileName(this,"Save File",QDir::currentPath());
if(saveFileName.isEmpty()){
QMessageBox::information(this,"Error Message","Select A File");
return;
}
QFile *file=new QFile;
file->setFileName(saveFileName);
bool ok=file->open(QIODevice::WriteOnly);
if(ok){
QTextStream out(file);
out<<ui->textEdit->toPlainText();//这里去除textEdit的纯文本
file->close();
this->setWindowTitle(saveFileName+"-----------------notepad");
delete file;
}
else{
QMessageBox::information(this,"Error Message","Save File Error");
return;
}
}

void MainWindow::setFontSlot(){
//get selected font
/*
bool ok;
QFont font = QFontDialog::getFont(
&ok, QFont("Helvetica [Cronyx]", 10), this);
if (ok) {
// the user clicked OK and font is set to the font the user selected
} else {
// the user canceled the dialog; font is set to the initial
// value, in this case Helvetica [Cronyx], 10
}
*/
bool ok;
QFont font=QFontDialog::getFont(&ok,this);
if(ok){
ui->textEdit->setFont(font);
}
else{
QMessageBox::information(this,"Error Message","Error Set Font");
return;
}
}

void MainWindow::setColorSlot(){
/*
const QColorDialog::ColorDialogOptions options = QFlag(colorDialogOptionsWidget->value());
const QColor color = QColorDialog::getColor(Qt::green, this, "Select Color", options);

if (color.isValid()) {
colorLabel->setText(color.name());
colorLabel->setPalette(QPalette(color));
colorLabel->setAutoFillBackground(true);
}
*/
QColor color=QColorDialog::getColor(Qt::red,this);
if(color.isValid()){
ui->textEdit->setTextColor(color);
}
else{
QMessageBox::information(this,"Error Message","Color is invalid");
return;
}
}

void MainWindow::currentDateTimeSlot(){
QDateTime current=QDateTime::currentDateTime();
QString time=current.toString("yyyy-M-dd hh:mm:ss");
ui->textEdit->append(time);
}

void MainWindow::aboutWebSiteSlot(){
QDesktopServices::openUrl(QUrl("http://wwww.baidu.com"));

}

void MainWindow::aboutSoftWareSlot(){

//创建about对象
about *dialog=new about;
dialog->show();//非模态对话框
//dialog.exec()  modal dailog
}

#include "mainwindow.h"
#include <QApplication>
#include <QPixmap>
#include <QSplashScreen>

//延时
void sleep(unsigned int msec)
{
QTime dieTime = QTime::currentTime().addMSecs(msec);
while( QTime::currentTime() < dieTime )
QCoreApplication::processEvents(QEventLoop::AllEvents, 100);
}

int main(int argc, char *argv[])
{
QApplication app(argc, argv);

//屏幕启动画面
QPixmap pixmap("screen.png");
QSplashScreen splash(pixmap);
splash.show();

sleep(5000);
// for(long index=0;index<=4590500000;index++);
MainWindow w;
w.show();

splash.finish(&w);
return app.exec();

}

#include "about.h"
#include "ui_about.h"

about::about(QWidget *parent) :
QDialog(parent),
ui(new Ui::about)
{
ui->setupUi(this);
this->setWindowIcon(QIcon(":new/icon/txt"));
/*
QLabel label;
QMovie *movie = new QMovie("animations/fire.gif");

label.setMovie(movie);
movie->start();
*/
this->movie=new QMovie("mynotepad.gif");
ui->movieLabel->setMovie(movie);
movie->start();

QObject::connect(ui->stopButton,SIGNAL(clicked()),this,SLOT(stopMovieSlot()));
QObject::connect(ui->startButton,SIGNAL(clicked()),this,SLOT(startMovieSlot()));
}

about::~about()
{
delete ui;
}
void about::startMovieSlot(){
this->movie->start();//开始动画播放
}
void about::stopMovieSlot(){
this->movie->stop();//停止动画播放
}

三、运行效果图

四、下面是源码下载链接