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• July 6, 2018 at 23:13 #19575
  
  Eric
  

  I’m using a Dialog and am getting a warning or error depending on whether or not a specific line is added to CustomDialog.qml as described below. However, I can’t see any actual problems, everything <i>seems</i> to be working as normal, but I’d like to see if this could cause future problems. My code:

   

  SubPage.qml

  import QtQml 2.2
  import QtQuick 2.9
  import Felgo 3.0
  
  NavigationItem {
      NavigationStack {
          Page {
              ...
              AppButton {
                  text: “Button”
                  onClicked: customDialog.open()
              }
  
              CustomDialog { id: customDialog }
          }
      }
  }
  

  CustomDialog.qml

  import QtQuick 2.9
  import Felgo 3.0
  
  Dialog {
      id: customDialog
      contentHeight: parent.height * 0.8
      contentWidth: parent.width * 0.9
      anchors.verticalCenter: parent.verticalCenter
      mainWindow: App // This is the important line I think!
      onCanceled: { ... }
      onAccepted: { ... }
  
      AppFlickable {
      ...
      }
  }

   

  <b>So if mainWindow: App is added to Dialog {}</b> I get the following warnings when SubPage.qml is opened:

  qrc:///qml/VPlayApps/controls/Dialog.qml:179: QML Connections: Cannot assign to non-existant property “onBackButtonPressedGlobally”

  qrc:///qml/VPlayApps/controls/Dialog.qml:180: Unable to assign undefined to QObject*

   

  <b>If mainWindows: App is NOT added to Dialog {}</b> then I don’t get the warnings, I get the following error, but the app still functions property:

  qrc:///qml/VPlayApps/controls/Dialog.qml:311: Error: Cannot assign QObject* to Dialog_QMLTYPE_18*

   

  July 9, 2018 at 12:56 #19581
  
  Günther
  

  Felgo Team

  Hi,

  you state mainWindow: App, which is not a correct assignment.

  App (note uppercase ‘A’) is the component for your mainWindow.
  If you named your app with id: app, you can reference mainWindow: app in your Dialog code then.

  Best,
  Günther

  July 10, 2018 at 23:04 #19600
  
  Eric
  

  Thank you for your reply. I’ve tried two different options for mainWindow, “app”, and “subPage”, where subPage is the id of the SubPage.qml’s page component. If I use mainWindow: app, I get the same error as stated in the original post, “Cannot assign QObject* to Dialog_QMLTYPE_18*”

  If I use mainWindow: subPage, I get

  qrc:///qml/VPlayApps/controls/Dialog.qml:179: QML Connections: Cannot assign to non-existant property “onBackButtonPressedGlobally”.

  Am I using mainWindow incorrectly? Should I be doing something else? Do you need more information?

  Thank you.

  July 11, 2018 at 16:21 #19608
  
  Günther
  

  Felgo Team

  Hi,

  using mainWindow: app is the correct way, e.g.:

  import Felgo 3.0
  import QtQuick 2.9
  
  App {
    id: app
  
    AppButton {
      anchors.centerIn: parent
      text: "Open"
      onClicked: customDialog.open()
    }
  
    Dialog {
      id: customDialog
      contentHeight: parent.height * 0.8
      contentWidth: parent.width * 0.9
      anchors.verticalCenter: parent.verticalCenter
      mainWindow: app // This is the important line I think!
      onCanceled: { console.log("cancel"); customDialog.close(); }
      onAccepted: { console.log("accept"); customDialog.close(); }
  
      AppFlickable {
        AppText { text: "MyDialog" }
      }
    }
  }
  

   

  You can ignore the error “Cannot assign QObject* to Dialog_QMLTYPE_18” for now – it should not affect the usage of your Dialog.

  Best,
  Günther

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