说明: 基于多线程的机制实现图片缩略图的显示。 QThread* thread = new ThumbnailThread(filename, 10 - waitseconds); waitseconds ++; connect(thread, SIGNAL(thumbnailFinished(QImage)), this, SLOT(addThumbnail(QImage))); connect(thread, SIGNAL(thumbnailFailed(const QString)), this
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