//at the end of buildDialog()
$this->tree->drag_source_set(GDK_BUTTON1_MASK, $this->targets, GDK_ACTION_COPY);
$this->tree->connect('drag-data-get', array(&$this, 'dragDataGet'));

function dragDataGet( $tree, $context, $selection_data, $info, $time) {
    if( count( $tree->selection) < 1) { return false; }
    $node = $tree->selection[0];
    $file = $tree->node_get_text( $node, 2);
    if( $file == '') { return false; }
    $selection_data->set($selection_data->target, 8, urlencode($this->getUriFromFile($file)) . "\r\n");
}
    
/**
*   converts a file name to a URI
*   useful to convert a file to the text/uri-list compatible format
*   @param  string  The file
*   @return string  The URI
*/
function getUriFromFile( $strFile) {
    if (strstr($strFile, '://')) {
        //real URL
        $strUri = $strFile;
    } else {
        //normal file
        if (substr($strFile, 1, 2) ==  ':\\') {
            //windows path c:\programs\bla\blu\file.bli
            $strUri = 'file://localhost/' . str_replace('\\', '/', $strFile);
        } else {
            //should be nice unix file
            //@fixme: convert relative names to absolute ones?
            $strUri = 'file://localhost' . realpath($strFile);
        }
    }
    return $strUri;
}

function pathurlencode($uri) {
    $uri = urlencode($uri);
    $uri = str_replace('%3A', ':', $uri);
    $uri = str_replace('%2F', '/', $uri);
    $uri = str_replace('%26', '&', $uri);
    $uri = str_replace('%40', '@', $uri);
    $uri = str_replace('%3A', ':', $uri);
    $uri = str_replace('%3F', '?', $uri);
    return $uri;
}