/**
* Create a screen for migrating (copying) layers
*
* @return string
*/
public static function createMigrationScreen()
{
$result = "";
$layers = DML::getLayers();
$layers = array_combine($layers, $layers);
$result .= sprintf("<form accept-charset=\"utf-8\" method=\"POST\" action=\"%s?action=migrate\">\n", $_SERVER["PHP_SELF"]);
$result .= sprintf("<p>Copy from %s to %s <button type=\"submit\">Copy</button></p>\n", GUI::createSelect("from", $layers), GUI::createSelect("to", $layers));
$result .= sprintf("<p>Warning: copying contents will overwrite any old data in the destination layer</p>\n");
$result .= "</form>\n";
return $result;
}
