In reference to making the browser window scroll, I don't have any
issues with that on my C++ app. I did not have to register or enable
anything for that to work..it just..worked. :-( I'm sorry I can't
help you on that one.
However, let me pull some code out here and see if any of it can help
you with events and such.
I'm not real sure how you embed Gecko with Java, but in my class
definition for C++, this is how I have it defined
class CGecko :
public nsSupportsWeakReference,
public nsIWindowCreator,
public nsIWebBrowserChrome,
public nsIEmbeddingSiteWindow,
public nsIWebProgressListener,
public nsIInterfaceRequestor,
public nsIPromptService,
public nsIDOMEventListener
{
...
};
Notice I have quite a bit more things implemented there than what you
have stated in your app...again, I'm not sure how different Java is
from C++ when doing this, but you will need to implement
nsIWebProgressListener and nsIDOMEventListener if you ever want to
receive events such as click, dblclick, load, document start/stop
load, etc...
First thing is that you will need to register for what I call the web
browser events (start/stop load), this is how I do it:
This is done in the initialization of the chrome and browser, etc..
//----------------------------------------------------------------------
//Now trying to setup for events from the web progress listener
if ( (pCOM_wr = do_GetWeakReference (NS_STATIC_CAST
(nsIWebBrowserChrome*, pCg))) == 0 ||
NS_FAILED (pCOM_wb->AddWebBrowserListener (pCOM_wr, NS_GET_IID
(nsIWebProgressListener))))
{
MsgBox (0, "CreateChromeWindow (): Failed to create the web
event listener.", __FILE__, __LINE__);
Shutdown ();
return (S_FALSE);
}
//----------------------------------------------------------------------
I never completely understood the above part, why you needed a weak
reference, but it works LOL. I grab a weak reference (this is why
you see nsSupportsWeakReference listed as one of my base classes, so
I can QI it from my class), then call AddWebBrowserListener () from
my nsIWebBrowser interface. That should set you up to receive 2
critical events, "Document Start Load" and "Document Stop Load"
Now that you can receive events when the document starts/stops
loading, you can then register for "DOM Events", this is how I do it:
The below method is part of nsIWebProgressListener interface and
where you determine the Document Start/Stop event
NS_IMETHODIMP CGecko::OnStateChange (nsIWebProgress *aWebProgress,
nsIRequest *aRequest, PRUint32 aStateFlags, nsresult aStatus)
{
//Temp vars
nsCOMPtr<nsIWebNavigation> pCOM_wn;
nsCOMPtr<nsIURI> pCOM_u; nsCOMPtr<nsIDOMWindow> pCOM_dw;
nsCOMPtr<nsIDOMEventTarget> pCOM_det;
nsCString csURI;
char *pszURI = 0;
//Getting URI that loaded and making sure we have an object
if (
(pCOM_wn = do_QueryInterface (pwb)) == 0 ||
NS_FAILED (pCOM_wn->GetCurrentURI (getter_AddRefs (pCOM_u))))
{ MsgBox (this, "OnStateChange (): Failed to
retrieve URI.", __FILE__, __LINE__);
return (S_FALSE);
}
//Getting the URI here
pCOM_u->GetSpec (csURI);
//Seeing what is going on with the doucmnet
if (aStateFlags & STATE_IS_DOCUMENT)
{ if (aStateFlags & STATE_START)
{
...
}
if (aStateFlags & STATE_STOP)
{ //Getting DOM Window to get the
event target
aWebProgress->GetDOMWindow (getter_AddRefs (pCOM_dw));
//Getting event target
pCOM_det = do_QueryInterface (pCOM_dw);
//Setting up listeners on the DOM window
//FOR ABORT
//----------------------------
//Unregistering listener first incase it's already
registered for this..Prolly not necessary
pCOM_det->RemoveEventListener (NS_ConvertUTF8toUTF16
("abort"), this, false);
//Registering listener
pCOM_det->AddEventListener (NS_ConvertUTF8toUTF16
("abort"), this, false);
//----------------------------
...
}
}
If you want to setup for other events, you just add another block of
code and use "click", "dblclick", "load", etc...
Then once that is done, you will receive notifications through your
nsIDOMEventListener::HandleEvent () method
To figure out what event is happening, this is how I do it in that
method.
NS_IMETHODIMP CGecko::HandleEvent (nsIDOMEvent *event)
{
//Temp vars
nsString sType; //Getting the type of event that happened
event->GetType (sType); //Going to see what event happened
and pass along the info in a POST command
if (wcsicmp (sType.get (), L"Abort") == 0)
{ ...
}
...
}
Just add more compares here for what events you need to catch and
deal with the events when they come along.
I hope this helps, or at least gives you a start in the direction you
need to head with your Java app. Unfortunately, I have not been able
to find a good tutorial online anywhere, I THINK there was one posted
on the boards no too long ago. I use http://www.xulplanet.com/ a lot
as a reference...no code examples but a great reference. Also, if
you can find it...there is a plugin for Firefox that is an XPCOM
component viewer. It shows you all the interfaces on your system.
Sometimes just browsing through them can help you find the right
interface you need for things. I've just pieced things together as I
have come across them and documented them as best I could so I knew
what they were. If I didn't have a full time job and a family I'd
write up a tutorial for C++....darn responsibilities LOL. I wish you
luck in your endeavor and feel free to ask any other questions. I'll
try to help you if I can.
Nik Williams
Artem Ananiev wrote:
I noticed these events (nsIDOMxxxEvent) yesterday but had no idea
how I could register my application to listen to them. I have an
instance of nsIWebBrowser and nsIWebBrowserChrome. Using
queryInterface I can get browser chrome's nsIBaseWindow - but none
of these classes has any method like addEventListener() or something
like this.
As for browser scrolling - I don't need to receive scrolling events
(may be need them later), but want the browser to react on them
itself. For example, if I click a link inside a browser, it follows
that page automatically without any actions in my code, but for
scrolling this is not a case. Do I need to listen to key/mouse
events myself and then tell the browser to perform what I need?
If you can send me some short example it would be fine. Also, don't
you know is there any tutorial about mozilla UI (windows, widgets,
events, etc.) available? All I can find in the web is descriptions
of Mozilla interfaces, not how to use them together:(
Thanks,
Artem
Niky Williams wrote:
Artem Ananiev wrote:
I'm embedding Mozilla-based browser into my Java application using
JavaXPCOM, on Windows. One of the first difficulties I met is that
browser doesn't react on mouse wheel, thoug its scrollbar is
present. My container implements these interfaces:
nsIWebBrowserChrome, nsIWebBrowserChromeFocus,
nsIEmbeddingSiteWindow. What should I do to enable mouse wheel in
embedded browser?
Another question is: is it possible to get mouse and key events
occuring in browser? I don't need them right now but they can be
useful in my app later.
Thanks,
Artem
Artem,
I'm not real familiar with Java, but to receive events in my C++
app, I implement the nsIDOMEventListener interface. You have to
setup the events you want notification from for this to work, but
it's not that hard. If you get to the point you need code
examples, I can provide you some in C++.
If you want to DISPATCH key or mouse events to an element, take a
look at:
nsIDOMDocumentEvent
nsIDOMEvent
nsIEventTarget
nsIDOMKeyEvent
nsIDOMMouseEvent
Again, if you need some code examples, I can provide you with a few.
Hope this helps!
Nik Williams
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