PresentingDrawer.qml

import QtQuick 2.10
import QtQuick.Controls 2.3

Drawer {
    id: _presentingDrawer

    width: Math.min(300, parent.width - 24);
    height: parent.height - y

    property Item _mainChild: null

    function toggle() {
        if(visible)
            close();
        else
            open();
    }

    function presentDrawerContent(item) {
        if(_mainChild)
            _mainChild.destroy();
        item.parent = _presentingDrawer.contentItem;
        item.drawer = _presentingDrawer;
        _mainChild = item;
        return true;
    }

    function closeAction() {
        if(_mainChild && typeof _mainChild.closeAction == "function") {
            if(_mainChild.closeAction())
                return true;
        }

        if(visible) {
            close();
            return true;
        } else
            return false;
    }
}