thumbnailworker.cpp

   1 #include "thumbnailworker.h"
   2
   3 #include <QDebug>
   4 #include <QTimer>
   5 #include <QThread>
   6
   7 ThumbnailWorker::ThumbnailWorker() :
   8     AbstractWorker(),
   9     m_pathList()
  10 {
  11 }
  12
  13 void ThumbnailWorker::addPath(const QString &path)
  14 {
  15     qDebug() << "ThumbnailWorker::addPath()" << path;
  16     QMutexLocker locker(&m_mutex);
  17     m_pathList << path;
  18 }
  19
  20 void ThumbnailWorker::clearPath()
  21 {
  22     QMutexLocker locker(&m_mutex);
  23     m_pathList.clear();
  24 }
  25
  26 QString ThumbnailWorker::getPath()
  27 {
  28     QMutexLocker locker(&m_mutex);
  29     if (m_pathList.isEmpty()) {
  30         return QString();
  31     }
  32     qDebug() << "ThumbnailWorker::getPath()";
  33     return m_pathList.takeFirst();
  34 }
  35
  36 void ThumbnailWorker::run()
  37 {
  38     qDebug() << "ThumbnailWorker::run() enter.";
  39
  40     while (!isAborted()) {
  41         QString path = getPath();
  42         if (!path.isEmpty()) {
  43             QPixmap pixmap(path);
  44             if (!pixmap.isNull()) {
  45                 QSize size(256, 256);
  46                 double scaleX = 1.0 * size.width() / pixmap.width();
  47                 double scaleY = 1.0 * size.height() / pixmap.height();
  48                 double scaleFactor = qMin(scaleX, scaleY);
  49                 if (scaleFactor < 1) {
  50                     pixmap = pixmap.scaled(pixmap.size() * scaleFactor,
  51                                            Qt::IgnoreAspectRatio,
  52                                            Qt::SmoothTransformation);
  53                 }
  54                 emit resultReady(path, pixmap);
  55             }
  56         }
  57         this->thread()->msleep(100);
  58     }
  59
  60     emit finished();
  61     qDebug() << "ThumbnailWorker::run() finished.";
  62 }