mshtml: Implement ProgressEvent's lengthComputable prop.

dlls/mshtml/htmlevent.c

@@ -2498,8 +2498,17 @@ static HRESULT WINAPI DOMProgressEvent_Invoke(IDOMProgressEvent *iface, DISPID d
 static HRESULT WINAPI DOMProgressEvent_get_lengthComputable(IDOMProgressEvent *iface, VARIANT_BOOL *p)
 {
     DOMProgressEvent *This = impl_from_IDOMProgressEvent(iface);
-    FIXME("(%p)->(%p)\n", This, p);
-    return E_NOTIMPL;
+    nsresult nsres;
+    cpp_bool b;
+
+    TRACE("(%p)->(%p)\n", This, p);
+
+    nsres = nsIDOMProgressEvent_GetLengthComputable(This->nsevent, &b);
+    if(NS_FAILED(nsres))
+        return map_nsresult(nsres);
+
+    *p = b ? VARIANT_TRUE : VARIANT_FALSE;
+    return S_OK;
 }
 
 static HRESULT WINAPI DOMProgressEvent_get_loaded(IDOMProgressEvent *iface, ULONGLONG *p)

dlls/mshtml/tests/xhr.js

@@ -47,6 +47,7 @@ function test_xhr() {
             var props = [ "initProgressEvent", "lengthComputable", "loaded", "total" ];
             for(var i = 0; i < props.length; i++)
                 ok(props[i] in e, props[i] + " not available in loadstart");
+            ok(e.lengthComputable === false, "lengthComputable in loadstart = " + e.lengthComputable);
             loadstart = true;
         };
         xhr.onloadend = function(e) {
@@ -55,6 +56,7 @@ function test_xhr() {
             var props = [ "initProgressEvent", "lengthComputable", "loaded", "total" ];
             for(var i = 0; i < props.length; i++)
                 ok(props[i] in e, props[i] + " not available in loadend");
+            ok(e.lengthComputable === true, "lengthComputable in loadend = " + e.lengthComputable);
             next_test();
         };
     }
@@ -171,6 +173,9 @@ function test_timeout() {
             else
                 ok(props[r] in e, props[r] + " not available");
         }
+        if(v >= 10) {
+            ok(e.lengthComputable === false, "lengthComputable = " + e.lengthComputable);
+        }
         next_test();
     }