/home/maxime/Projets/Mixxx/1.10/mixxx/src/library/browse/foldertreemodel.cpp

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#if defined (__WINDOWS__)
#include <windows.h>
#include <Shellapi.h>
#include <Shobjidl.h>
#else
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <errno.h>
#endif

#include <QtGui>
#include <QDirModel>
#include <QStringList>
#include <QFileInfo>
#include <QDesktopServices>

#include "library/treeitem.h"
#include "library/browse/foldertreemodel.h"
#include "library/browse/browsefeature.h"

FolderTreeModel::FolderTreeModel(QObject *parent)
        : TreeItemModel(parent) {
}

FolderTreeModel::~FolderTreeModel() {
}

/* A tree model of the filesystem should be initialized lazy.
 * It will take the universe to iterate over all files over filesystem
 * hasChildren() returns true if a folder has subfolders although
 * we do not know the precise number of subfolders.
 *
 * Note that BrowseFeature inserts folder trees dynamically and rowCount()
 * is only called if necessary.
 */
bool FolderTreeModel::hasChildren( const QModelIndex & parent) const
{

    TreeItem *item = static_cast<TreeItem*>(parent.internalPointer());
    /* Usually the child count is 0 becuase we do lazy initalization
     * However, for, buid-in items such as 'Quick Links' there exist
     * child items at init time
     */
    if(item->dataPath().toString() == QUICK_LINK_NODE)
        return true;
    //Can only happen on Windows
    if(item->dataPath().toString() == DEVICE_NODE)
        return true;

    //In all other cases the dataPath() points to a folder

    QString folder = item->dataPath().toString();

    /*
     *  The following code is too expensive, general and SLOW since
     *  QDIR::EntryInfoList returns a full QFileInfolist
     *
     *
     *  QDir dir(item->dataPath().toString());
     *  QFileInfoList all = dir.entryInfoList(QDir::Dirs | QDir::NoDotAndDotDot);
     *  return (all.count() > 0);
     *
     *  We can benefit from low-level filesystem APIs, i.e.,
     *  Windows API or SystemCalls
     */

#if defined (__WINDOWS__)
    folder.replace("/","\\");

    //quick subfolder test
    SHFILEINFOW sfi;
    SHGetFileInfo((LPCWSTR) folder.constData(), NULL, &sfi, sizeof(sfi), SHGFI_ATTRIBUTES);
    return (sfi.dwAttributes & SFGAO_HASSUBFOLDER);
#else
    // For OS X and Linux
    // http://stackoverflow.com/questions/2579948/checking-if-subfolders-exist-linux

    std::string dot("."), dotdot("..");
    bool found_subdir = false;
    QByteArray ba = folder.toLocal8Bit();
    DIR *directory = opendir(ba);

    if (directory == NULL){
        return false;
    }
    struct dirent *entry;
    while (!found_subdir && ((entry = readdir(directory)) != NULL)) {
        if (entry->d_name != dot && entry->d_name != dotdot)
        {
            found_subdir = (entry->d_type == DT_DIR || entry->d_type == DT_LNK);
            //qDebug() << "Subfolder of " << folder << " : " << entry->d_name << "type :" << entry->d_type;

        }
    }
    closedir(directory);
    return found_subdir;

#endif

}