js: Add interface to set a PDF document event listener.

This makes it possible to track alert events from PDF document when
e.g. field formatting or field value validation actions are triggered.

diff --git a/source/tools/murun.c b/source/tools/murun.c
index 362f75a817432c571c8ae5d580c8a9ed5f6232aa..2837cbc53d2e21127fe852e1360d9f873a59f52a 100644 (file)
--- a/source/tools/murun.c
+++ b/source/tools/murun.c
@@ -4542,6 +4542,77 @@ static void ffi_PDFDocument_wasPureXFA(js_State *J)
        js_pushboolean(J, val);
 }
 
+struct event_cb_data
+{
+       js_State *J;
+       const char *listener;
+};
+
+static void event_cb(fz_context *ctx, pdf_document *doc, pdf_doc_event *event, void *data)
+{
+       js_State *J = ((struct event_cb_data *) data)->J;
+       const char *listener = ((struct event_cb_data *) data)->listener;
+
+       switch (event->type)
+       {
+       case PDF_DOCUMENT_EVENT_ALERT:
+               {
+                       pdf_alert_event *alert = pdf_access_alert_event(ctx, event);
+
+                       if (js_try(J))
+                               rethrow_as_fz(J);
+
+                       js_getregistry(J, listener);
+                       if (js_hasproperty(J, -1, "onAlert"))
+                       {
+                               js_pushnull(J);
+                               js_pushstring(J, alert->message);
+                               js_pcall(J, 1);
+                               js_pop(J, 1);
+                       }
+                       js_endtry(J);
+               }
+               break;
+
+       default:
+               fz_throw(ctx, FZ_ERROR_GENERIC, "event not yet implemented");
+               break;
+       }
+}
+
+static void ffi_PDFDocument_setEventListener(js_State *J)
+{
+       fz_context *ctx = js_getcontext(J);
+       pdf_document *pdf = js_touserdata(J, 0, "pdf_document");
+       struct event_cb_data *data = NULL;
+
+       fz_try(ctx)
+       {
+               data = pdf_get_doc_event_callback_data(ctx, pdf);
+               if (!data)
+                       data = fz_calloc(ctx, 1, sizeof (struct event_cb_data));
+               pdf_set_doc_event_callback(ctx, pdf, NULL, NULL);
+       }
+       fz_catch(ctx)
+               rethrow(J);
+
+       if (js_try(J)) {
+               fz_free(ctx, data);
+               js_throw(J);
+       }
+       if (data->listener)
+               js_unref(J, data->listener);
+       js_copy(J, 1);
+       data->listener = js_ref(J);
+       data->J = J;
+       js_endtry(J);
+
+       fz_try(ctx)
+               pdf_set_doc_event_callback(ctx, pdf, event_cb, data);
+       fz_catch(ctx)
+               rethrow(J);
+}
+
 static void ffi_PDFDocument_hasUnsavedChanges(js_State *J)
 {
        fz_context *ctx = js_getcontext(J);
@@ -6955,6 +7026,7 @@ int murun_main(int argc, char **argv)
                jsB_propfun(J, "PDFDocument.countUnsavedVersions", ffi_PDFDocument_countUnsavedVersions, 0);
                jsB_propfun(J, "PDFDocument.validateChangeHistory", ffi_PDFDocument_validateChangeHistory, 0);
                jsB_propfun(J, "PDFDocument.wasPureXFA", ffi_PDFDocument_wasPureXFA, 0);
+               jsB_propfun(J, "PDFDocument.setEventListener", ffi_PDFDocument_setEventListener, 1);
 
                jsB_propfun(J, "PDFDocument.hasUnsavedChanges", ffi_PDFDocument_hasUnsavedChanges, 0);
                jsB_propfun(J, "PDFDocument.wasRepaired", ffi_PDFDocument_wasRepaired, 0);