一、布局界面，如图所示的界面及对象名称：
二、引入头文件
#include <QMessageBox> #include <QDebug> #include <QFile> #include <QFileDialog> #include <QDir> #include <QTextStream> #include <QFontDialog> #include <QFont> #include <QColorDialog> #include <QColor> #include <QDate> #include <QUrl> #include <QDesktopServices>
三、声明槽函数
private slots: void calcSlot(); //新建文件 void createNewFile(); //打开文件 void openFileSlot(); //保存文件 void saveFileSlot(); //设置字体 void setFontSlot(); //设置颜色 void setColorSlot(); //设置当前时间 void setCurrentDateSlot(); //关于我们,打开一个网站,使用的是默认浏览器 void aboutWebsiteSlot(); //弹出子对话框 void aboutSoftwareSlot();
三、实现槽函数：
//计算的槽
void MainWindow::calcSlot(){
double firstNum = ui->firstNum->text().toDouble();
double secondNum = ui->secondNum->text().toDouble();
QString resultNum = "0";
QString ComboBoxVal = ui->countComboBox->currentText();
if(ComboBoxVal == "+"){
resultNum = QString::number(firstNum + secondNum);
}else if(ComboBoxVal == "-"){
resultNum = QString::number(firstNum - secondNum);
}else if(ComboBoxVal == "*"){
resultNum = QString::number(firstNum * secondNum);
}else{
resultNum = QString::number(firstNum / secondNum);
}
QMessageBox::information(this,"结果",resultNum);
ui->addNum->setText(resultNum);
}
//新建文件
void MainWindow::createNewFile(){
//如果当前文档的内容已经改变了
if(ui->textAreaInput->document()->isModified()){
qDebug()<<"is aready";
return;
}else{
//qDebug()<<"is null for ecit";
ui->textAreaInput->clear();
this->setWindowTitle("新文档.txt");
}
}
//打开文件
void MainWindow::openFileSlot(){
QString fileName = QFileDialog::getOpenFileName(this,"Open File",QDir::currentPath());
//qDebug()<<"文件名是："<<fileName;
if(fileName.isEmpty()){
QMessageBox::information(this,"错误消息","请选择一个文件");
return;
}
QFile *file = new QFile;
file->setFileName(fileName);
bool openFileOk = file->open(QIODevice::ReadOnly);
if(openFileOk){
//文件与文本流相关联
QTextStream in(file);
ui->textAreaInput->setText(in.readAll());
file->close();
delete file;
}else{
QMessageBox::information(this,"错误提示","打开文件失败："+file->errorString());
return;
}
}
//保存文件
void MainWindow::saveFileSlot(){
QString fileName = QFileDialog::getSaveFileName(this,"Save File",QDir::currentPath());
if(fileName.isEmpty()){
QMessageBox::information(this,"错误提示","请选择一个文件");
return ;
}
QFile *file = new QFile;
file->setFileName(fileName);
bool saveFileOk = file->open(QIODevice::WriteOnly);
if(saveFileOk){
QTextStream out(file);
out<<ui->textAreaInput->toPlainText(); //这里是取出textEdit中的纯文本
file->close();
delete file;
QMessageBox::information(this,"提示","保存成功");
}else{
QMessageBox::information(this,"错误提示","保存文件失败");
return;
}
}
//设置字体
void MainWindow::setFontSlot(){
bool ok ;
QFont font = QFontDialog::getFont(&ok,this);
if(ok){
ui->textAreaInput->setFont(font);
}else{
QMessageBox::information(this,"错误提示","设置字体错误");
return;
}
}
//设置颜色
void MainWindow::setColorSlot(){
QColor color = QColorDialog::getColor(Qt::red,this);
if(color.isValid()){
ui->textAreaInput->setTextColor(color);
}else{
QMessageBox::information(this,"错误提示","设置字体颜色错误");
return;
}
}
//设置当前时间
void MainWindow::setCurrentDateSlot(){
QDateTime current = QDateTime::currentDateTime();
QString time = current.toString("yyyy-MM-dd hh:mm:ss");
ui->textAreaInput->append(time);
}
//关于我们
void MainWindow::aboutWebsiteSlot(){
QDesktopServices::openUrl(QUrl("http://www.sindsun.com/"));
}
//关于软件
void MainWindow::aboutSoftwareSlot(){
aboutme *dlg = new aboutme;
//显示非模态对话框
dlg->show();
//显示模态圣诞框
//dlg->exec();
}四、添加信号与槽的连接：
this->setWindowTitle("记事本");
QObject::connect(ui->equalButton,SIGNAL(clicked()),this,SLOT(calcSlot()));
QObject::connect(ui->createNewAction,SIGNAL(triggered()),this,SLOT(createNewFile()));
QObject::connect(ui->openAction,SIGNAL(triggered()),this,SLOT(openFileSlot()));
QObject::connect(ui->saveFileAction,SIGNAL(triggered()),this,SLOT(saveFileSlot()));
QObject::connect(ui->exitAction,SIGNAL(triggered()),this,SLOT(close())); //关闭对话框
QObject::connect(ui->undoAction,SIGNAL(triggered()),ui->textAreaInput,SLOT(undo()));
QObject::connect(ui->redoAction,SIGNAL(triggered()),ui->textAreaInput,SLOT(redo()));
QObject::connect(ui->copyAction,SIGNAL(triggered()),ui->textAreaInput,SLOT(copy()));
QObject::connect(ui->pasteAction,SIGNAL(triggered()),ui->textAreaInput,SLOT(paste()));
QObject::connect(ui->selectAllAction,SIGNAL(triggered()),ui->textAreaInput,SLOT(selectAll()));
QObject::connect(ui->shearAction,SIGNAL(triggered()),ui->textAreaInput,SLOT(cut()));
QObject::connect(ui->colorAction,SIGNAL(triggered()),this,SLOT(setColorSlot()));
QObject::connect(ui->fontAction,SIGNAL(triggered()),this,SLOT(setFontSlot()));
QObject::connect(ui->dateAction,SIGNAL(triggered()),this,SLOT(setCurrentDateSlot()));
QObject::connect(ui->aboutAction,SIGNAL(triggered()),qApp,SLOT(aboutQt()));
QObject::connect(ui->websiteAction,SIGNAL(triggered()),this,SLOT(aboutWebsiteSlot()));
QObject::connect(ui->aboutSoftwareAction,SIGNAL(triggered()),this,SLOT(aboutSoftwareSlot()));五、下面是实现添加图标的过程
1、资源 -> 添加新文件 -> Qt -> Qt Resource File -> 选择、起名称 -> 完成
2、提前准备一份徐囡楠文件，拷贝到项目根目录下
3、右键资源文件，导入现有的资源
4、在ui界面编辑动作，添加图标
六、关于我们的对话框，加载一个动态图片
1、引入QMovie类
#include <QMovie>
2、弹出的新对话框布局
3、声明槽函数
private: QMovie *movie; private slots:
//开始播放
void startMoviesSlot();
//停止播放
void stopMoviesSlot();
4、实现槽函数
void aboutme::startMoviesSlot(){this->movie->start();
}
void aboutme::stopMoviesSlot(){this->movie->stop();
}
5、在构造函数中添加代码：
this->movie = new QMovie("flashPic.gif");ui->flashLabel->setMovie(this->movie);
this->movie->start();
QObject::connect(ui->yesBtn,SIGNAL(clicked()),this,SLOT(startMoviesSlot()));
QObject::connect(ui->cancelBtn,SIGNAL(clicked()),this,SLOT(stopMoviesSlot()));
七、为程序添加启动界面，添加在main.cpp中
#include <QSplashScreen>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QPixmap pixmap("flashPic.gif");
QSplashScreen splash(pixmap);
splash.show();
for(long index=0; index<=100000000; index++);
MainWindow w;
w.show();
splash.finish(&w);
return a.exec();
}
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