Patrick McHale wrote:
>
> John,
>
> We are still confused - Do you have an example of some actual code that
> implements this process.
> something that actually works...
I'm attaching a very simple example that does an asynchronous
callback into JS code. It uses the (ugly) nsITimer interface for
the delay. I think this is similar to what you first talked about
wanting. I just hacked this on to the existing xpcom sample stuff
to make this easy to build in a mozilla tree (on Windows at
least).
I hope this clears up the concept for you.
John.
Index: nsISample.idl
===================================================================
RCS file: /cvsroot/mozilla/xpcom/sample/nsISample.idl,v
retrieving revision 1.5
diff -u -r1.5 nsISample.idl
--- nsISample.idl 2000/06/27 05:54:46 1.5
+++ nsISample.idl 2001/06/12 16:39:07
@@ -48,4 +48,16 @@
};
+[scriptable, uuid(be7cf690-5ee4-11d5-90de-0010a4e73d9a)]
+interface jband_SampleCallBackSink : nsISupports
+{
+ void tick(in PRUint32 whatever);
+};
+[scriptable, uuid(799e0530-5ee4-11d5-90de-0010a4e73d9a)]
+interface jband_SampleCallBackService : nsISupports
+{
+ void setTimer(in jband_SampleCallBackSink sink,
+ in PRUint32 ticks,
+ in PRUint32 whatever);
+};
Index: nsSample.cpp
===================================================================
RCS file: /cvsroot/mozilla/xpcom/sample/nsSample.cpp,v
retrieving revision 1.10
diff -u -r1.10 nsSample.cpp
--- nsSample.cpp 2001/03/12 20:42:59 1.10
+++ nsSample.cpp 2001/06/12 16:39:07
@@ -139,3 +139,45 @@
printf("%s %s\n", aPrefix, mValue);
return NS_OK;
}
+
+/***************************************************************************/
+
+NS_IMPL_ISUPPORTS2(jband_SampleCallBackServiceImpl,
+ jband_SampleCallBackService,
+ nsITimerCallback)
+
+jband_SampleCallBackServiceImpl::jband_SampleCallBackServiceImpl()
+ : mWhatever(0)
+{
+ NS_INIT_ISUPPORTS();
+}
+
+jband_SampleCallBackServiceImpl::~jband_SampleCallBackServiceImpl()
+{
+ // do nothing...
+}
+
+/* void setTimer (in jband_SampleCallBackSink sink, in PRUint32 ticks, in PRUint32
+whatever); */
+NS_IMETHODIMP jband_SampleCallBackServiceImpl::SetTimer(jband_SampleCallBackSink
+*sink, PRUint32 ticks, PRUint32 whatever)
+{
+ if(!sink || mSink)
+ return NS_ERROR_FAILURE;
+
+ nsCOMPtr<nsITimer> timer(do_CreateInstance("@mozilla.org/timer;1"));
+ if(!timer)
+ return NS_ERROR_FAILURE;
+ timer->Init(NS_STATIC_CAST(nsITimerCallback*,this), ticks);
+
+ mSink = sink; // This will make the nsCOMPtr do an AddRef()
+ mWhatever = whatever;
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP_(void)
+jband_SampleCallBackServiceImpl::Notify(nsITimer *timer)
+{
+ if(mSink)
+ mSink->Tick(mWhatever);
+ mSink = nsnull; // This will also make the nsCOMPtr do a Release()
+}
Index: nsSample.h
===================================================================
RCS file: /cvsroot/mozilla/xpcom/sample/nsSample.h,v
retrieving revision 1.3
diff -u -r1.3 nsSample.h
--- nsSample.h 2000/09/13 23:56:08 1.3
+++ nsSample.h 2001/06/12 16:39:08
@@ -111,3 +111,28 @@
private:
char* mValue;
};
+
+/***************************************************************************/
+
+#include "nsITimer.h"
+#include "nsITimerCallback.h"
+
+class jband_SampleCallBackServiceImpl :
+ public jband_SampleCallBackService,
+ public nsITimerCallback
+{
+public:
+ NS_DECL_ISUPPORTS
+ NS_DECL_JBAND_SAMPLECALLBACKSERVICE
+
+ // not very xpcom compilant method from nsITimerCallback
+ NS_IMETHOD_(void) Notify(nsITimer *timer);
+
+ jband_SampleCallBackServiceImpl();
+ virtual ~jband_SampleCallBackServiceImpl();
+
+private:
+ nsCOMPtr<jband_SampleCallBackSink> mSink;
+ PRUint32 mWhatever;
+};
+
Index: nsSampleModule.cpp
===================================================================
RCS file: /cvsroot/mozilla/xpcom/sample/nsSampleModule.cpp,v
retrieving revision 1.17
diff -u -r1.17 nsSampleModule.cpp
--- nsSampleModule.cpp 2001/05/05 05:33:23 1.17
+++ nsSampleModule.cpp 2001/06/12 16:39:08
@@ -92,6 +92,8 @@
// For each class that wishes to support nsIClassInfo, add a line like this
NS_DECL_CLASSINFO(nsSampleImpl)
+NS_GENERIC_FACTORY_CONSTRUCTOR(jband_SampleCallBackServiceImpl)
+
static nsModuleComponentInfo components[] =
{
{ "Sample Component", NS_SAMPLE_CID, NS_SAMPLE_CONTRACTID, nsSampleImplConstructor,
@@ -101,6 +103,12 @@
NS_CI_INTERFACE_GETTER_NAME(nsSampleImpl),
NULL /* no language helper */,
&NS_CLASSINFO_NAME(nsSampleImpl)
+ },
+
+ { "jband_SampleCallBackService",
+ {0x6cc7a6e0, 0x5ee8, 0x11d5, { 0x90, 0xde, 0x0, 0x10, 0xa4, 0xe7, 0x3d, 0x9a }},
+ "@jband/sampleCallbackService;1",
+ jband_SampleCallBackServiceImplConstructor,
}
};
Index: xpconnect-sample.html
===================================================================
RCS file: /cvsroot/mozilla/xpcom/sample/xpconnect-sample.html,v
retrieving revision 1.10
diff -u -r1.10 xpconnect-sample.html
--- xpconnect-sample.html 2000/09/14 23:20:41 1.10
+++ xpconnect-sample.html 2001/06/12 16:39:08
@@ -12,6 +12,41 @@
</script>
</center>
+<hr>
+<p>
+Hacky sample...
+<p>
+
+<script>
+var callback = {
+ tick : function (whatever)
+ {
+ alert(whatever);
+ }
+}
+
+function startTimer() {
+
+ var msec = document.getElementById('msec').value;
+
+ netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
+ var iface = Components.interfaces.jband_SampleCallBackService;
+ var clazz = Components.classes["@jband/sampleCallbackService;1"];
+ var timer = clazz.createInstance(iface);
+
+ timer.setTimer(callback, msec, msec);
+}
+</script>
+
+
+Enter msec delay...
+<form>
+<input type="text" id="msec">
+<input type="button" value="doit" onclick="startTimer();">
+</form>
+<hr>
+
+
<p>In the spirit of "worse is better" this somewhat rough guide is being
released to the world. It will be expanded upon and improved.
