Block gwt DisclosurePanel on open state

How may I block a gwt DisclosurePanel on the open state ?

I mean, how can I prevent this DisclosurePanel to close if the user click the header more than once ?

(My header is a textBox, I want the user to enter a text, and the panel should remain open if the user unfocus the textBox and focus newly by clicking it. The DisclosurePanel content has a "cancel" button that closes the panel)

Thank you very much.

I edit 开发者_C百科my question after 2 first answers: I would like to avoid to reopen the DisclosurePanel once closed to avoid flashing effect. I actually want to prevent the DisclosurePanel to close. Maybe sinkEvents can help me... if so, how? Thanks.

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A NativePreviewHandler receives all events before they are fired to their handlers. By registering a nativePreviewHandler the first time your disclosurePanel is opened, you can cancel the click event. You can later decide to remove this handler by preventClose.removeHandler();

HandlerRegistration preventClose = null;
....
panel.addOpenHandler(new OpenHandler<DisclosurePanel>() {
    @Override
    public void onOpen(OpenEvent<DisclosurePanel> event) {
        if (preventClose == null){
            preventClose = Event.addNativePreviewHandler(new NativePreviewHandler() {
                @Override
                public void onPreviewNativeEvent(NativePreviewEvent event) {
                    if (event.getTypeInt()==Event.ONCLICK && event.getNativeEvent().getEventTarget() == panel.getHeader().getElement().cast()) 
                        event.cancel();
                }
            });
        }
    }
});

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The obvious answer is review the javadoc here: https://google-web-toolkit.googlecode.com/svn/javadoc/1.5/com/google/gwt/user/client/ui/DisclosurePanel.html

There is a setOpen() method that: Changes the visible state of this DisclosurePanel.

Set it to false from a click event to capture the user action.

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The JavaDoc is right here: https://google-web-toolkit.googlecode.com/svn/javadoc/latest/com/google/gwt/user/client/ui/DisclosurePanel.html jamesDrinkard pointed the old 1.5 javadoc.

You can use the addCloseHandler(CloseHandler<DisclosurePanel> handler) method to add a handler so when the user tries to close it you can reopen it again with setOpen().

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Maybe not the best way, but it worked for me (maybe just one of both will work too):

    dPanel.setOpen(true);

    dPanel.addOpenHandler(new OpenHandler<DisclosurePanel>() {
        @Override
        public void onOpen(OpenEvent<DisclosurePanel> event) {
            dPanel.setOpen(true);
        }
    });

    dPanel.addCloseHandler(new CloseHandler<DisclosurePanel>() {
        @Override
        public void onClose(CloseEvent<DisclosurePanel> event) {
            dPanel.setOpen(true);
        }
    });