Qt学习（二）------实例mynotepad制作

#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
}