How to attach mouse event listeners to embedded nsIWebBrowser

[Matthew Talbert]

I've embedded an nsIWebBrowser in my application. Because I'm just
generating HTML for it on the fly, I'm using OpenStream,
AppendToStream, and CloseStream to add content. What I need is to add
event listeners for mouse movement over the web browser as well as
mouse clicks. I've read documentation and tried lots of different
things, but nothing I have tried has worked. For instance, the code
below would seem to do the right thing, but it does nothing:

   nsCOMPtr<nsIDOMWindow> domWindow;
    mWebBrowser->GetContentDOMWindow(getter_AddRefs(domWindow));

    if (!mEventTarget) {
        mEventTarget = do_QueryInterface(domWindow);

        if (mEventTarget)
                mEventTarget->AddEventListener(NS_LITERAL_STRING
("mouseover"), (nsIDOMEventListener *)mEventListener, PR_FALSE);
}

Perhaps it isn't working because this is run during initialization,
but before any content is actually added. However, if I add it during
AppendStream, or CloseStream, it segfaults.

What am I doing wrong?

Matthew
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[rappel101170]

Hi Matthew,

here is a code snippet that worked for me. At least for an embedded
gecko 1.8.1.

nsCOMPtr<nsIDOMEventTarget> cpEventTarget;
nsCOMPtr<nsIDOMWindow> cpDomWin;
m_pWebBrowser->GetContentDOMWindow (getter_AddRefs(cpDomWin));
nsCOMPtr<nsIDOMWindow2> cpDomWin2 (do_QueryInterface (cpDomWin));
cpDomWin2->GetWindowRoot(getter_AddRefs(cpEventTarget));

rv = cpEventTarget->AddEventListener(NS_LITERAL_STRING("mousedown"),
                m_pBrowserImpl, PR_FALSE);

I did this after initialization and m_pBrowserImpl received the
mousedown events.

regards,
Rainer
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[Matthew Talbert]

On Aug 28, 8:15 am, ra <rappel101...@...> wrote:

> Hi Matthew,
>
> here is a code snippet that worked for me. At least for an embedded
> gecko 1.8.1.
>
> nsCOMPtr<nsIDOMEventTarget> cpEventTarget;
> nsCOMPtr<nsIDOMWindow> cpDomWin;
> m_pWebBrowser->GetContentDOMWindow (getter_AddRefs(cpDomWin));
> nsCOMPtr<nsIDOMWindow2> cpDomWin2 (do_QueryInterface (cpDomWin));
> cpDomWin2->GetWindowRoot(getter_AddRefs(cpEventTarget));
>
> rv = cpEventTarget->AddEventListener(NS_LITERAL_STRING("mousedown"),
>                 m_pBrowserImpl, PR_FALSE);
>
> I did this after initialization and m_pBrowserImpl received the
> mousedown events.
>
> regards,
> Rainer

Thank you, that works. I had tried before to get a nsIDOMWindow2, and
then GetWindowRoot, but I guess I still don't know when to use stuff
like QueryInterface and AddRefs. Thanks again,

Matthew
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