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    Default [FIXED] [CLOSED] BaseEvent type is null

    [FIXED] [CLOSED] BaseEvent type is null


    I have a listener for a tree and button where the listener is the same for both. I am trying to avoid inner classes so that I can do incremental debug updates in GWT. Doing the classic inline class override for a "Listener" creates an inner class which cause the VM to view the incremental update as a schema change and fails.

    For both a button and tree on a Events.Select listen the BaseEvent.source is null so you can't detect the source of the original event. My assumption is that this is a bug. I am using gxt-1.2.3

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    use component and not source. Also please read the javadocs for component event / button event etc.

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    Post Component

    Component


    Not sure if you followed my original post so here is some code

    public class Foo extends Window implements Listener{

    public Foo(){
    newProjectButton = new Button("New Project");
    newProjectButton.addListener(Events.Select, this);
    .... rest of code

    }

    public void handleEvent(BaseEvent te) {
    if(te.source == null){
    // this should not be null
    }
    }

    }


    If I check the instance of BaseEvent as a instanceof ButtonEvent then I can cast and get the be.button as the source of the event.

    The assumption is that BaseEvent.source should not be null in the base class.

    Thanks

    Scooter

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    The javadocs tell you that not all fields are set.

    Code:
    if(be instanceof ComponentEvent) {
      source = be.component
    }

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    Default source

    source


    I understand the challenges associated with a base class and subclasses that are appropriate for the specific "Component" and the corresponding subclass event.

    In the case of BaseEvent the source should be a common or global attribute of all subclasses. If source can be null in BaseEvent and has only three attributes then source probably shouldn't be in BaseEvent. It doesn't make sense to have source as an object in BaseEvent and not have it set as the source of the event.

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    And i can only suggest you again to read the ajvadocs. It tell you what fields are set.

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    Default Response

    Response


    I can only reply that having Docs that explains bad design or a bug is ok but that doesn't excuse having code that can be improved or follow the original intent of a base class in the design.

    No need to reply!

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    We did a change that makes source filled everytime.

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    Fixed in SVN.

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