DialogPresenter.qml

import QtQuick 2.10
import QtQuick.Controls 2.3
import de.skycoder42.QtMvvm.Core 1.0
import de.skycoder42.QtMvvm.Quick 1.0

QtObject {
    id: _dialogPresenter

    property Item rootItem: null

    function showDialog(config, result) {
        if(config.type == "msgbox")
            return createMsgBox(config, result)
        else if(config.type == "input")
            return createInput(config, result)
        else if(config.type == "file")
            return createFile(config, result)
        else
            return false;
    }

    function closeAction() {
        if(_popups.length > 0) {
            _popups[_popups.length - 1].reject();
            return true;
        } else
            return false;
    }

    property var _popups: []
    property Component _msgBoxComponent: MsgBox {
        id: __msgBox

        onClosed: {
            var index = _popups.indexOf(__msgBox);
            if(index > -1) {
                __msgBox.destroy();
                _dialogPresenter._popups.splice(index, 1);
            }
        }

        Component.onCompleted: {
            _popups.push(__msgBox)
            __msgBox.open()
        }
    }

    property Component _inputComponent: InputDialog {
        id: __input

        onClosed: {
            var index = _popups.indexOf(__input);
            if(index > -1) {
                __input.destroy();
                _dialogPresenter._popups.splice(index, 1);
            }
        }

        Component.onCompleted: {
            _popups.push(__input)
            __input.open()
        }
    }

    property Component _fileComponent: FileDialog {
        id: __file

        onClosed: {
            var index = _popups.indexOf(__file);
            if(index > -1) {
                __file.destroy();
                _dialogPresenter._popups.splice(index, 1);
            }
        }

        Component.onCompleted: {
            _popups.push(__file)
            __file.open()
        }
    }

    property Component _folderComponent: FolderDialog {
        id: __folder

        onClosed: {
            var index = _popups.indexOf(__folder);
            if(index > -1) {
                __folder.destroy();
                _dialogPresenter._popups.splice(index, 1);
            }
        }

        Component.onCompleted: {
            _popups.push(__folder)
            __folder.open()
        }
    }

    function createMsgBox(config, result) {
        var props = config.viewProperties;
        props["msgConfig"] = config;
        props["msgResult"] = result;
        var incubator = _msgBoxComponent.incubateObject(rootItem, props);
        return incubator.status !== Component.Error;
    }

    function createInput(config, result) {
        var props = config.viewProperties;
        props["msgConfig"] = config;
        props["msgResult"] = result;
        var incubator = _inputComponent.incubateObject(rootItem, props);
        return incubator.status !== Component.Error;
    }

    function createFile(config, result) {
        var props = config.viewProperties;
        props["msgConfig"] = config;
        props["msgResult"] = result;
        var incubator = null;
        if(config.subType == "folder")
            incubator = _folderComponent.incubateObject(rootItem, props);
        else
            incubator = _fileComponent.incubateObject(rootItem, props);
        return incubator.status !== Component.Error;
    }
}