RootPanel.detachNow(Widget) method should be called before removing a
wrapped widget from DOM to prevent your memory leak.
I believe that this method is documented in every widget that
implements .wrap()
-jason
On Feb 10, 2009, at 10:55 AM, Nicolas Wetzel wrote:
> Hi all! ,
>
> The Widget.wrap() API is very usefull to build widgets(fragments)
> from html templates retrieved from server or bound with the java
> widget class at the compilation time (generators).
> By this way, the design (HTML+CSS) is entirely delagated to Web
> Developpers, Java Gwt Developpers have to manage only with GWT
> Widget which are in fact only controllers:
>
> Each controler pick up some html element by id left in its
> corresponding template and "build" gwt widget (TextBox,Label etc...)
> with the wrap API to manage the (dynamic) behavior.
> No css gwt api is used, no Panel for composition is used.
>
> Everything works fine while the widget fragment is attached to the
> DOM (RootPanel) but there is a trouble :
> If the widget fragment is detached its components (i e widgets
> created with the wrap api) are not garbaged because they don't have
> any parent.
> So there is a memory leak. The wrap method doesn't alow to link
> the life cycle of the component to its logical parent i e the widget
> parent. Here is the code of the wrap method :
>
> public static Label wrap(Element element) {
> // Assert that the element is attached.
> assert Document.get().getBody().isOrHasChild(element);
>
> Label label = new Label(element);
>
> // Mark it attached and remember it for cleanup.
> label.onAttach();
> RootPanel.detachOnWindowClose(label);
>
> return label;
> }
>
>
> By the call of "RootPanel.detachOnWindowClose(label);" the widget is
> gabaged only when the main window is closed. It is not very clean
> if the fragment is garbaged. We reported this touble
> http://code.google.com/p/google-web-toolkit/issues/detail?id=3113
> in the bug tracker few months ago but it still in the same
> state .
>
>
>
>
>
>
>
>
> >
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