[Kool]

Hi All,

The WebStorage does not seem to call the callback provided as a parameter. Could it be an issue with how I provide the function callback as a parameter?

Minimal example:

import Felgo 3.0
import QtQuick 2.0

GameWindow {
    id: gameWindow
    activeScene: scene
    screenWidth: 960
    screenHeight: 640

    Scene {
        id: scene

        width: 480
        height: 320

        WebStorage {
            id: storage
        }

        function theCallback() {
            console.debug("Called back")
        }
    }


    Component.onCompleted: {
        storage.setValue("someValue", 0.0, scene.theCallback)
        console.debug("someValue", storage.getValue("someValue"))
    }
}

 

[GüntherFelgo Team]

Hi,

we just had a closer look:
Unfortunately the callback feature of setValue is broken at the moment – we will provide a fix with one of the next Felgo updates!

Thanks for reporting the issue!

Best,
GT

[Kool]

Hi Gunther,
Thanks for looking into it. Could you suggest a work around to the following problem:

• In my main menu scene, I have a ListView with a ListModel that shows level meta data such as “performance score” , “unlocked”, “completed”
• The ListModel initialises with default values for all – but these values are updated with data from WebStorage
• After the user completes a level, GameScene updates the level meta data in WebStorage
• I needed the callback to refresh the ListModel above with the new WebStorage data

Here is a minimal example:

import Felgo 3.0
import QtQuick 2.0

GameWindow {
    id: gameWindow
    activeScene: scene
    screenWidth: 960
    screenHeight: 640

    Scene {
        id: scene

        width: 480
        height: 320

        WebStorage {
            id: storage
        }

        ListModel {
            id: model
            ListElement {name: "Level 1"; value: 50}
        }

        ListView {
            anchors.centerIn: parent
            model: model
            delegate: Item {
                width: parent.width
                height: 50

                Text {
                    anchors.centerIn: parent
                    text: value
                }
            }
        }

        function updateModel() {
            for (var ii = 0; ii < model.count; ++ii)
            {
                var name = model.get(ii).name
                var score = storage.getValue(name)
                model.setProperty(ii, "value", score)
            }
        }

        Component.onCompleted: updateModel() // update model with storage data as soon as possible
    }

    Component.onCompleted: {
        // this actually takes place in my GameScene after a level finishes
        // and I simulate this here

        storage.setValue("Level 1", 50, scene.updateModel)
    }
}

 

(it might not compile/run – I wrote this in a text editor as I don’t have QtCreator on hand)

As the callback mechanism doesn’t work, the model does not get updated. Is there a work around and hopefully better way to keep the ListModel and WebStorage in sync?

[ChristianFelgo Team]

Hi,

the stored value is available immediatelly after you call setValue(), so you don’t need a callback for updating the model.

If there is a write conflict (which only happens if the same key is written to from another device of the same user, you can use the onWriteConflict signal handler. You can also use the onWriteValueFinished signal handler, but it usually is better to immediatelly update your model after a setValue call, so users see the changed value immediatelly.

Cheers, Chris