在粤嵌arm板滑动切换图片程序

以下是一个基于Qt的在粤嵌ARM板上实现图片滑动切换的程序示例：

#include <QGuiApplication>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QPixmap>
#include <QMouseEvent>

class ImageView : public QGraphicsView
{
public:
    ImageView(QWidget *parent = nullptr)
        : QGraphicsView(parent)
    {
        // 设置场景和视图大小
        m_scene = new QGraphicsScene(this);
        m_scene->setSceneRect(0, 0, 800, 480);
        setScene(m_scene);
        setFixedSize(800, 480);

        // 加载图片
        m_images.append(QPixmap("/opt/images/image1.jpg"));
        m_images.append(QPixmap("/opt/images/image2.jpg"));
        m_images.append(QPixmap("/opt/images/image3.jpg"));
        m_images.append(QPixmap("/opt/images/image4.jpg"));

        // 显示第一张图片
        m_imageIndex = 0;
        m_scene->addPixmap(m_images.at(m_imageIndex));
    }

protected:
    void mousePressEvent(QMouseEvent *event) override
    {
        // 记录下鼠标按下的位置
        m_lastPos = event->pos();
    }

    void mouseMoveEvent(QMouseEvent *event) override
    {
        // 计算出偏移量
        QPoint offset = event->pos() - m_lastPos;

        // 移动图片
        QRectF rect = sceneRect();
        rect.translate(-offset.x(), -offset.y());
        setSceneRect(rect);
        m_lastPos = event->pos();
    }

    void mouseReleaseEvent(QMouseEvent *event) override
    {
        // 判断是否切换到下一张或上一张图片
        int diff = event->pos().x() - m_lastPos.x();
        if (diff > 50 && m_imageIndex < m_images.size() - 1) {
            // 切换到下一张图片
            m_imageIndex++;
            m_scene->clear();
            m_scene->addPixmap(m_images.at(m_imageIndex));
            setSceneRect(m_scene->itemsBoundingRect());
        } else if (diff < -50 && m_imageIndex > 0) {
            // 切换到上一张图片
            m_imageIndex--;
            m_scene->clear();
            m_scene->addPixmap(m_images.at(m_imageIndex));
            setSceneRect(m_scene->itemsBoundingRect());
        }
    }

private:
    QGraphicsScene *m_scene;
    QList<QPixmap> m_images;
    int m_imageIndex;
    QPoint m_lastPos;
};

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    ImageView view;
    view.show();

    return app.exec();
}

在这个程序中，与前面的程序相比，唯一的区别是图片的路径需要修改为在粤嵌ARM板上的实际路径。这里我们将图片放在了`/opt/images`目录下，可以根据实际情况进行修改。