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[Windows Phone 8] Assign action to button press which switches to UI thread.

Discussion in 'Windows' started by fendorio, Apr 15, 2014.

  1. fendorio

    fendorio

    Joined:
    Mar 8, 2014
    Posts:
    19
    Hi there, I'm trying to implement IAP for my windows phone game.

    In a unity script I define an Action<string,bool> Foo , and in the UI thread (mainpage.xaml) I want to assign that action a method defined in the UI thread.

    Something like so:

    UnityScript:

    public event Action<string,bool> Foo;

    void SomeGUIMethod()
    {
    if ( A button is clicked)
    {
    Foo("hello",true); //What I want to happen is for this to 'fire' off to the UI thread for the assigned method to be executed.
    }
    }

    Sadly Foo is always null when I return to the Unity thread.

    In my UI thread:

    MainPage.xaml.cs

    void Unity_Loaded()
    {

    var script = UnityEngine.Object.FindObjectOfType<MyScript>();

    script.Foo += SomeMethod; //I assign the method an eventhandler
    }

    void Foo(string arg1, bool arg2)
    {
    //Do stuff
    }

    So yeah, what I intend to happen is after Unity_Loaded is executed, the action is assigned a method, and once it's called it'll fire off to the UI thread to do it's stuff, sadly as soon as I get back to the Unity thread the Action is null.

    Can anyone give any insight into this? Has been bugging me all afternoon!
     
  2. Aurimas-Cernius

    Aurimas-Cernius

    Unity Technologies

    Joined:
    Jul 31, 2013
    Posts:
    3,729
  3. Tautvydas-Zilys

    Tautvydas-Zilys

    Unity Technologies

    Joined:
    Jul 25, 2013
    Posts:
    10,670
    What you're doing seems correct. Do you happen to have more than one object with that script attached in the scene? UnityEngine.Object.FindObjectOfType<MyScript>() will return the very first one in that case. Making the event static might help then.
     
  4. fendorio

    fendorio

    Joined:
    Mar 8, 2014
    Posts:
    19
    HI there, thank you both for the replies!

    What I believe I was doing was was using the '+=' operator to assign rather than the assignment operator '='.

    The fix I worked up was creating a static class with two Actions: InvokeUIThread and InvokeUnityThread,

    Then in Unity_Loaded I assigned them public methods defined in the mainpage.xaml:

    InvokeUIThread = Foo;

    public void Foo(Action action)
    {
    Dispatcher.BeginInvoke( () =>
    {
    action();
    }

    And likewise with the InvokeUnity Action, but replacing Dispatcher.BeginInvoke with UnityApp.BeginInvoke.

    Thanks again
     
  5. bleater

    bleater

    Joined:
    Apr 19, 2012
    Posts:
    27