动态加载图片

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDir>
#include <QString>
#include <QStringList>
#include <QListWidget>
#include <QVBoxLayout>
#include <QListWidgetItem>
#include <mainwindow.h>
#include "ui_mainwindow.h"
#include <QProcess>
#include <QUrl>
#include<QMessageBox>
#include <mythread.h>
#include <windows.h> // windows
#include <QTimer>
//#include <sys/stat.h>  //linux
bool play_state;
//是否重新载入视频
bool if_reload=false;
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    //ui->label->setStyleSheet("border: 3px groove gray; border-radius: 5px; background-color: rgba(255, 193, 245, 0%); ");
    ui->label->setStyleSheet("border: 3px groove gray; border-radius: 5px; background-color: white;");
    ui->label_player->setStyleSheet("border: 3px groove gray; border-radius: 5px; background-color: white; ");
    ui->pushButton_play_and_pause->setEnabled(false);
    m_showWidget.setWindowTitle("Image Show");
    m_showWidget.setAlignment(Qt::AlignCenter);
    this->IsFinishVideo=false;
    qApp->processEvents();
}

MainWindow::~MainWindow()
{
    delete ui;
}


void MainWindow::on_pushButton_clicked()
{
    path = QFileDialog::getOpenFileName(this, tr("选择视频"), ".", tr("Image Files(*.flv *.mp4)"));//得到视频路径
    //播放状态，true为播放，false为暂停

    QFile file(path);
    if(!file.open(QIODevice::ReadOnly))//视频路径打不开
     {
         //QMessageBox::information(NULL, "Title", "Content", QMessageBox::Ok, QMessageBox::Ok);
         return;
     }
     if(if_reload)
     {
         //重新加载视频时，重置以下变量
         delete layout_video;
         delete mediaPlayer;
         delete videoWidget;
     }
     if_reload = true;

     mediaPlayer = new QMediaPlayer();

     videoWidget = new QVideoWidget();

     layout_video = new QVBoxLayout;

     //设置视频播放区域与Label的边距
     layout_video->setMargin(1);
         //根据label_player尺寸设置播放区域

     mediaPlayer->setMedia(QUrl::fromLocalFile(path));
           //play_state为true表示播放，false表示暂停
     play_state = true;

           ui->pushButton_play_and_pause->setEnabled(true);
           ui->pushButton_play_and_pause->setText("暂停");//启用播放/暂停按钮，并将其文本设置为“暂停”
           //播放器开启
           videoWidget->resize(ui->label_player->size());
           layout_video->addWidget(videoWidget);
           ui->label_player->setLayout(layout_video);

           mediaPlayer->setVideoOutput(videoWidget);
           mediaPlayer->play();
           connect(mediaPlayer,SIGNAL(stateChanged(QMediaPlayer::State)),this,SLOT(msg()));

}
void MainWindow::msg()//提示处理完毕信息
{
    if(mediaPlayer->state()==QMediaPlayer::StoppedState)
    {
    QMessageBox::information(NULL, "vedio", "视频处理完毕", QMessageBox::Ok, QMessageBox::Ok);
    }
}
void MainWindow::on_pushButton_play_and_pause_clicked()
{
    //反转播放状态
        if(play_state)
        {
            mediaPlayer->pause();
            ui->pushButton_play_and_pause->setText("播放");
        }
        else
        {
            mediaPlayer->play();
            ui->pushButton_play_and_pause->setText("暂停");
        }

        play_state = !play_state;
}
void MainWindow::ShowImage()
{
    qDebug()<<"调用"<<endl;
        this->setWindowTitle("image");
        this->setMinimumSize(800, 600);
        this->setMaximumSize(1600,1200);

        const QSize IMAGE_SIZE(250, 150);
        const QSize ITEM_SIZE(250, 150);

        // 判断路径是否存在
        //m_strPath = "/home/pi/QT_img"; // linux路径
        m_strPath = "E:\\img";    //windows路径
        QDir dir(m_strPath);//获取当前目录
        if (!dir.exists()) {
            QMessageBox::information(NULL, "error", "没有此路径");
            return;
        }
        // 设置过滤器
        dir.setFilter(QDir::Files | QDir::NoSymLinks);
        QStringList filters;
        filters << "*.png" << "*.jpg"<<"*.jpeg";
        dir.setNameFilters(filters);
        m_imgList = dir.entryList();//目录下所有文件和文件夹的名字，返回一个字符串列表


        if (m_imgList.count() <= 0) {
            return;
        }

        m_listWidget = new QListWidget(this);
        m_listWidget->setIconSize(IMAGE_SIZE);
        m_listWidget->setResizeMode(QListView::Adjust);
        m_listWidget->setViewMode(QListView::IconMode);
        m_listWidget->setMovement(QListView::Static);
        m_listWidget->setSpacing(8);
        int nowcount = 0;
            dir.mkdir(m_strPath);
            dir.setFilter(QDir::Files | QDir::NoSymLinks);
            filters << "*.png" << "*.jpg"<<"*.jpeg";
            dir.setNameFilters(filters);
            m_imgList = dir.entryList();//目录下所有文件和文件夹的名字，返回一个字符串列表
            //qDebug()<<"m"
            if(m_imgList.count() != oldimgList)//有新加入图片
            {
                qDebug()<<"新加入图片"<<endl;
                flag = 0;
                oldimgList = m_imgList.count();
            }
                for (int i = 0; i<m_imgList.count(); ++i)
                {
                    //QPixmap pixmap(m_strPath + "/" + m_imgList.at(i));//linux
                    QPixmap pixmap(m_strPath + "\\" + m_imgList.at(i)); // windows


        //            if(pixmap.isNull())//如果图片不存在 不显示 不插入 但要有一个位置
        //            {
        //                qDebug("error");

        //                //QListWidgetItem *listWidgetItem = new QListWidgetItem(QIcon(pixmap.scaled(IMAGE_SIZE)), m_imgList.at(j));
        //                //listWidgetItem->setSizeHint(ITEM_SIZE);
        //                //m_listWidget->insertItem(j, listWidgetItem);
        //                flag = 1;
        //                QListWidgetItem *listWidgetItem = new QListWidgetItem(QIcon(pixmap.scaled(IMAGE_SIZE)), m_imgList.at(j));
        //                listWidgetItem->setSizeHint(ITEM_SIZE);
        //                m_listWidget->insertItem(j, listWidgetItem);
        //                continue;
        //            }

                        QListWidgetItem *listWidgetItem = new QListWidgetItem(QIcon(pixmap.scaled(IMAGE_SIZE)), m_imgList.at(i));
                        listWidgetItem->setSizeHint(ITEM_SIZE);
                        m_listWidget->insertItem(i, listWidgetItem);      
                }
                delete ui->label->layout();
                QVBoxLayout *mainLayout = new QVBoxLayout;
                mainLayout->addWidget(m_listWidget);
                mainLayout->setMargin(0);
                //this->setLayout(mainLayout);
                ui->label->setLayout(mainLayout);
                // 信号与槽
                connect(m_listWidget, SIGNAL(itemClicked(QListWidgetItem*)), this, SLOT(slot_itemClicked(QListWidgetItem*)));
//            if(pixmap.isNull())//如果图片不存在 不显示 不插入 但要有一个位置
//            {
//               qDebug("error");

//               //QListWidgetItem *listWidgetItem = new QListWidgetItem(QIcon(pixmap.scaled(IMAGE_SIZE)), m_imgList.at(j));
//                //listWidgetItem->setSizeHint(ITEM_SIZE);
//                //m_listWidget->insertItem(j, listWidgetItem);
//                flag = 1;
//                QListWidgetItem *listWidgetItem = new QListWidgetItem(QIcon(pixmap.scaled(IMAGE_SIZE)), m_imgList.at(j));
//                listWidgetItem->setSizeHint(ITEM_SIZE);
//                m_listWidget->insertItem(j, listWidgetItem);
//                continue;
//            }



}

//单击某一图片将其显示出来
void MainWindow::slot_itemClicked(QListWidgetItem * item) {

           qDebug()<<"item"<<m_listWidget->row(item);//是按顺序的


             m_showWidget.setPixmap(QPixmap(m_strPath + "\\" + m_imgList.at(m_listWidget->row(item))));
             m_showWidget.show();

             //delete maximage;
   }
void MainWindow::onTimeout()
{
    Isflag();//判断flag
    if(flag == 0)
    {
    this->ShowImage();//flag 为0刷新 有新的图片过来
    flag = 1;
    }
   // this->ShowImage();
}


//判断图片总数有没有变化 变了 flag = 0 此时让label刷新
void MainWindow::Isflag()
{
    m_strPath = "E:\\img";    //windows路径
    QDir dir(m_strPath);//获取当前目录
    dir.setFilter(QDir::Files | QDir::NoSymLinks);
    QStringList filters;
    filters << "*.png" << "*.jpg"<<"*.jpeg";
    dir.setNameFilters(filters);
    m_imgList = dir.entryList();//目录下所有文件和文件夹的名字，返回一个字符串列表
    //qDebug()<<"m"
    if(m_imgList.count() != oldimgList)//有新加入图片
    {
        qDebug()<<"新加入图片"<<endl;
        flag = 0;
        oldimgList = m_imgList.count();
    }
}
void MainWindow::on_pushButton_3_clicked()
{
    //system("python D://Desktop/1.py");

    //path 是视频路径变量
    //QProcess::execute("python D://Desktop/1.py");

    //this->ShowImage();
    QTimer *timer = new QTimer();//新建一个定时器对象
    connect(timer, SIGNAL(timeout()), this, SLOT(onTimeout()));
    timer->start(1000);

       // Mythread *mythread=new Mythread();
    //mythread->start();
    /*while(1){
        if(this->IsFinishVideo){
            break;
        }


    }*/
}