mshtml: Added IDOMMouseEvent stub implementation.

dlls/mshtml/htmlevent.h

@@ -59,10 +59,13 @@ typedef enum {
 typedef struct {
     DispatchEx dispex;
     IDOMEvent IDOMEvent_iface;
+    IDOMMouseEvent IDOMMouseEvent_iface;
 
     LONG ref;
 
     nsIDOMEvent *nsevent;
+    nsIDOMMouseEvent *mouse_event;
+
     eventid_t event_id;
     WCHAR *type;
     EventTarget *target;

dlls/mshtml/tests/events.c

@@ -2666,6 +2666,7 @@ static void test_iframe_connections(IHTMLDocument2 *doc)
 
 static void test_create_event(IHTMLDocument2 *doc)
 {
+    IDOMMouseEvent *mouse_event;
     IDocumentEvent *doc_event;
     IEventTarget *event_target;
     IHTMLElement *elem;
@@ -2720,6 +2721,20 @@ static void test_create_event(IHTMLDocument2 *doc)
 
     IEventTarget_Release(event_target);
 
+    hres = IDOMEvent_QueryInterface(event, &IID_IDOMMouseEvent, (void**)&mouse_event);
+    ok(hres == E_NOINTERFACE, "QueryInterface(IID_IDOMMouseEvent returned %08x\n", hres);
+
+    IDOMEvent_Release(event);
+
+    str = a2bstr("MouseEvent");
+    hres = IDocumentEvent_createEvent(doc_event, str, &event);
+    SysFreeString(str);
+    ok(hres == S_OK, "createEvent failed: %08x\n", hres);
+
+    hres = IDOMEvent_QueryInterface(event, &IID_IDOMMouseEvent, (void**)&mouse_event);
+    ok(hres == S_OK, "QueryInterface(IID_IDOMMouseEvent returned %08x\n", hres);
+    IDOMMouseEvent_Release(mouse_event);
+
     IDOMEvent_Release(event);
 
     IDocumentEvent_Release(doc_event);