如何在自定義文件瀏覽對話框Qt C ++中實現上一個和下一個按鈕

Question

我正在添加基於Qt的自定義文件打開對話框，因為本機QFileDialog導致對我的應用程序的某些阻塞。 我能夠執行以下操作。

• 主頁鏈接
• 桌面鏈接
• 父鏈接（向上按鈕）
• DoubleClick導航到目錄

但是找不到怎么辦

• 上一條鏈接
• 下一個連結

那么，如何在帶有C ++的Qt5中做到這一點？

Answer 1

我固定為

struct BrowsingHistory
{
    QString dir;
    BrowsingHistory * next;
    BrowsingHistory * prev;
    BrowsingHistory(const QString & path = "") :
        dir(path),
        next(0),
        prev(0)
    {}
};

BrowsingHistory  *m_history;
BrowsingHistory  *m_historyHead;

在構造函數中，我初始化為..

m_history = m_historyHead = new BrowsingHistory(/*Your default location*/);

m_historyHead用於析構函數中的內存釋放，因為它始終指向列表的開頭（基本上，結構BrowsingHistory是LinkedList的實現）

while(m_historyHead)
{
    BrowsingHistory * temp = m_historyHead;
    m_historyHead = m_historyHead->next;
    delete temp;
}

m_history：始終指向當前路徑。

在單擊desktopButton，homeButton，parentButton時，我調用了RegisterHistory（），它定義為...

void RegisterHistory(const QString& dirPath)
{
    if(m_history->dir != dirPath)
    {
        if(m_history->next)
        {
            m_history->next->dir = dirPath;
            m_history = m_history->next;
            BrowsingHistory * currentHistory = m_history->next;
            while(currentHistory)
            {
                BrowsingHistory * temp = currentHistory;
                currentHistory = currentHistory->next;
                delete temp;
            }
            m_history->next = 0;
        }
        else
        {
            BrowsingHistory * currentHistory = new BrowsingHistory(dirPath);
            currentHistory->prev = m_history;
            m_history->next = currentHistory;
            m_history = m_history->next;
        }
    }
}

現在是下一個和上一個插槽：

void btnNext_Clicked()
{
    if(m_history && m_history->next)
    {
        QString dirPath = m_history->next->dir;
        ui->listFileView->setRootIndex(m_pDirModel->setRootPath(dirPath));
        m_history = m_history->next;
    }
}

void btnBack_Clicked()
{
    if(m_history && m_history->prev)
    {
        QString dirPath = m_history->prev->dir;
        ui->listFileView->setRootIndex(m_pDirModel->setRootPath(dirPath));
        m_history = m_history->prev;
    }
}