嵌入式linux--电子相册

实验内容与要求：采用QT开发技术，在物联网实验箱上实现一个电子相框，系统上电启动后自动启动此电子相框程序。程序自动读取U盘中的所有图片，并自动按照5秒一张的时间间隔播放。图片自动在显示屏全屏显示（不能变形）。所有图片自动循环播放。如果没有插入U盘或U盘中没有图片，则界面上提示没有可播放的图片。要求支持jpg、jpeg、gif、png、bmp等常见格式的图片。可以加入图片切换时的特效功能。

特色功能：点击屏幕显示暂停按钮和关闭按钮 再次点击即可隐藏

PS：自动启动需要改系统脚本

//formphoto.cpp
#include "formphoto.h"
#include "ui_formphoto.h"
#include <QDirIterator>
#include <QDir>
#include <QFileInfo>
#include <QDesktopWidget>
//#include <QGraphicsOpacityEffect>

FormPhoto::FormPhoto(QWidget *parent) :
QWidget(parent),
ui(new Ui::FormPhoto)
{
ui->setupUi(this);
this->Init();
}
FormPhoto::~FormPhoto()
{
delete ui;
}
void FormPhoto::Init()
{
width = QApplication::desktop()->width();
height = QApplication::desktop()->height();
ui->scrollArea -> setFrameShape(QFrame::NoFrame);
ui->scrollArea -> resize(width,height);
ui->scrollArea -> setAlignment(Qt::AlignCenter);
ui->imageLabel -> resize(width,height);
ui->imageLabel -> setAlignment(Qt::AlignCenter);
ui->showbutton -> setStyleSheet("QToolButton{background: transparent;}");
ui->showbutton -> resize(width,height);
ui->playorstop -> setGeometry(QRect(QPoint(width/2-25, height/2-25), QSize(50, 50)));
ui->playorstop -> setStyleSheet("QToolButton{background: transparent;}");
ui->playorstop -> setVisible(false);
ui->close-> setGeometry(QRect(QPoint(width-70,5), QSize(30, 30)));
ui->close -> setStyleSheet("QToolButton{background: transparent;}");
ui->close -> setVisible(false);
currentNo = 0;
imageNum = 0;
isplaying = true;
imagePixmap.load(":/image/MainPage.jpg");
imagePixmap = imagePixmap.scaled(width,height,Qt::IgnoreAspectRatio);
ui->imageLabel->setPixmap(imagePixmap);
timerfordelay=new QTimer;
connect(timerfordelay,SIGNAL(timeout()),this,SLOT(hasImages()));
timerfordelay->start(2000);
timer=new QTimer;
connect(timer,SIGNAL(timeout()),this,SLOT(playImageSlot()));
timer->start(5000);
//timerforfade = new QTimer;
}
void FormPhoto::hasImages()
{
timerfordelay->stop();
this -> getImages("/udisk/image");
if(!imageNum)
{
QMessageBox message(QMessageBox::Warning,NULL,"<font size='26' color='black'>U盘中无图片</font>", QMessageBox::Retry | QMessageBox::Cancel, NULL);
message.setButtonText (QMessageBox::Retry,QString("重试"));
message.setButtonText (QMessageBox::Cancel,QString("退出"));
switch(message.exec()){
case QMessageBox::Retry: this->hasImages();break;
case QMessageBox::Cancel:  app->quit();break;
}
}
else
this -> playImageSlot();

}

void FormPhoto::playImageSlot()
{

if(currentNo>=imageNum)
currentNo=0;
QString fileName=imageArrary[currentNo++];
if(isgif[currentNo-1] == true){
QMovie *movie = new QMovie(fileName);
ui->imageLabel->setMovie(movie);
movie->start();
}
else{
imagePixmap.load(fileName);
imagePixmap = imagePixmap.scaled(width,height,Qt::KeepAspectRatio);
ui->imageLabel->setPixmap(imagePixmap);
}
//    opacity=0;
//    this->fade_on_fade_in();
//    connect(timerforfade,SIGNAL(timeout()),this,SLOT(fade_on_fade_in()));
//    timerforfade->start(50);

}

void FormPhoto::getImages(QString _dir)
{
QFileInfo dir(_dir);
if(!dir.isDir()){
QMessageBox message(QMessageBox::Warning,NULL,"<font size='26' color='black'>请插入U盘</font>", QMessageBox::Retry | QMessageBox::Cancel, NULL);
message.setButtonText (QMessageBox::Retry,QString("重试"));
message.setButtonText (QMessageBox::Cancel,QString("退出"));
switch(message.exec()){
case QMessageBox::Retry: this->getImages(_dir);break;
case QMessageBox::Cancel:  app->quit();break;
}
}
else{
QDirIterator it(_dir,QDir::Files|QDir::Dirs|QDir::NoDotAndDotDot);
while (it.hasNext())//存在
{
QString name = it.next();//读取
QFileInfo info(name);
if (info.isDir())//判断是目录
{
this->getImages(name);//递归
}
else
{
if (info.suffix() == "jpg" || info.suffix() == "bmp" || info.suffix() == "png" || info.suffix() == "gif" || info.suffix() == "jpeg")
{
if(info.suffix()=="gif")
isgif[imageNum] = true;
else
isgif[imageNum] = false;
imageArrary[imageNum++]=name;//符合添加
}
}
}
}
}
void FormPhoto::on_showbutton_clicked()
{
if(ui->playorstop->isHidden()){
ui->playorstop->setVisible(true);
ui->close->setVisible(true);
}
else{
ui->playorstop->setVisible(false);
ui->close->setVisible(false);
}
}

void FormPhoto::on_playorstop_clicked()
{
if(isplaying){
this->timer->stop();
isplaying = false;
ui->playorstop->setIcon(QPixmap(":/image/play.png"));
}
else{
this->timer->start(5000);
isplaying = true;
ui->playorstop->setIcon(QPixmap(":/image/stop.png"));
}
}

void FormPhoto::on_close_clicked()
{
app->quit();
}
//void FormPhoto::fade_on_fade_in()
//{   if(opacity==1.0)
//    {
//        this->timerforfade->stop();//定时器停止
//    }
//    else
//    {
//        QGraphicsOpacityEffect *effect  = new QGraphicsOpacityEffect;;
//        effect->setOpacity(opacity);
//        ui->imageLabel->setGraphicsEffect(effect);

//    }
//    opacity+=0.01;//透明度累加
//}

完整工程下载：http://download.csdn.net/detail/qq_29777421/9892855