// parent.qml
import QtQuick 2.1
import QtQuick.Controls 1.0

Rectangle {

    width: 640
    height: 480

    signal closed

    Button {
        text: qsTr("Open child window")
        anchors.horizontalCenter: parent.horizontalCenter
        anchors.verticalCenter: parent.verticalCenter
        onClicked: {
            child.visible = true
        }
    }

    TextField {
        id: text_field1
        x: 93
        y: 299
        width: 471
        height: 22
        placeholderText: "Text Field"
        text: activeFocus ? "I have active focus!" : "I do not have active focus"
    }

    Child {
        id: child
        visible: false
        modality: Qt.WindowModal
    }

    Button {
        id: button1
        x: 488
        y: 397
        text: "Close"
        onClicked: {
            closed()
        }
    }
}

// Child.qml
import QtQuick 2.1
import QtQuick.Controls 1.0
import QtQuick.Window 2.0

Window {
    width: 500
    height: 300

    TextField {
        id: text_field1
        x: 73
        y: 189
        width: 227
        height: 22
        placeholderText: "Text Field"
    }

    Button {
        id: button1
        x: 373
        y: 187
        text: "OK"
        onClicked: {
            close()
        }
    }
}


# example.py
import sys
from PyQt5 import QtWidgets, QtCore, QtQuick
from PyQt5.QtWidgets import QDialog, QWidget

def qt5_qml_dir():
    import os
    import subprocess
    qmldir = subprocess.check_output(["qmake", "-query",
                                      "QT_INSTALL_QML"]).strip()
    if len(qmldir) == 0:
        raise RuntimeError('Cannot find QT_INSTALL_QML directory, "qmake -query '
                        + 'QT_INSTALL_QML" returned nothing')
    if not os.path.exists(qmldir):
        raise RuntimeError("Directory QT_INSTALL_QML: %s doesn't exist" % qmldir)
    
    # On Windows 'qmake -query' uses / as the path separator
    # so change it to \\. 
    if sys.platform.startswith('win'):
        import string
        qmldir = string.replace(qmldir, '/', '\\')

    return qmldir

class FocusTest(QDialog):
    
    def __init__(self, parent=None):
        super(FocusTest, self).__init__(parent)
        self._parent = parent

        view = QtQuick.QQuickView()
        self._view = view
        view.setResizeMode(QtQuick.QQuickView.SizeViewToRootObject)
        
        # add the Qt Quick library path
        view.engine().addImportPath(qt5_qml_dir())

        view.setSource(QtCore.QUrl('parent.qml'))
        w = QWidget.createWindowContainer(view, self)
        w.setMinimumSize(view.size())
        w.setMaximumSize(view.size())
        r = view.rootObject()
        self._root = r
        
        r.closed.connect(self.onClosed)

    def onClosed(self):
        self._view.close()
        self.accept()
        
if __name__=="__main__":
    app = QtWidgets.QApplication(sys.argv)
    s = "Test placeholder"
    label = QtWidgets.QLabel(s, None)
    label.setAlignment(QtCore.Qt.AlignHCenter | QtCore.Qt.AlignVCenter)
    label.setWindowTitle(s)
    label.resize(800, 400)
    label.show()
    
    s = FocusTest(label)
    s.accepted.connect(label.close)
    s.open()
    app.exec_()