Qt：layout测试及Qlabel加载图片demo

测试QLayout和QLabel加载图片的demo MyDebug << "label1->size" << label1->size(); QString path = QCoreApplication::applicationDirPath(); path = QFileDialog::getOpenFileName(this, "open image", path, tr("Images (*.png *.xpm *.jpg)")); QPixmap pixmap(path); MyDebug << "pixmap.size = " << pixmap.size(); //pixmap = pixmap.scaled(label1->size());//没有考虑QLabel的线宽，导致label1比加载图片前大了两个线宽 pixmap = pixmap.scaled(label1->width()-label1->lineWidth()*2, label1->height()-label1->lineWidth()*2); label1->setPixmap(pixmap); MyDebug << "label1->size" << label1->size(); MyDebug << "pixmap.size = " << pixmap.size();