[PATCH 3/9] mshtml: Allocate Mouse events via the types table.

[Gabriel Ivăncescu]

From: Gabriel Ivăncescu

Instead of specially treating them.

Signed-off-by: Gabriel Ivăncescu 
---
 dlls/mshtml/htmlevent.c | 257 ++++++++++++++++++++++++----------------
 dlls/mshtml/htmlevent.h |   2 -
 2 files changed, 155 insertions(+), 104 deletions(-)

diff --git a/dlls/mshtml/htmlevent.c b/dlls/mshtml/htmlevent.c
index 28ce6ff76ee..e91269dc55a 100644
--- a/dlls/mshtml/htmlevent.c
+++ b/dlls/mshtml/htmlevent.c
@@ -307,6 +307,23 @@ static DOMUIEvent *DOMUIEvent_from_DOMEvent(DOMEvent *event)
     return CONTAINING_RECORD(event, DOMUIEvent, event);
 }

+typedef struct {
+    DOMUIEvent ui_event;
+    IDOMMouseEvent IDOMMouseEvent_iface;
+    nsIDOMMouseEvent *nsevent;
+} DOMMouseEvent;
+
+static DOMMouseEvent *DOMMouseEvent_from_DOMEvent(DOMEvent *event)
+{
+    return CONTAINING_RECORD(event, DOMMouseEvent, ui_event.event);
+}
+
+static void *DOMMouseEvent_query_interface(DOMEvent*,REFIID);
+static inline DOMMouseEvent *unsafe_DOMMouseEvent_from_DOMEvent(DOMEvent *event)
+{
+    return event && event->query_interface == &DOMMouseEvent_query_interface ? DOMMouseEvent_from_DOMEvent(event) : NULL;
+}
+
 typedef struct {
     DispatchEx dispex;
     IHTMLEventObj IHTMLEventObj_iface;
@@ -419,12 +436,13 @@ static HRESULT WINAPI HTMLEventObj_get_srcElement(IHTMLEventObj *iface, IHTMLEle
 static HRESULT WINAPI HTMLEventObj_get_altKey(IHTMLEventObj *iface, VARIANT_BOOL *p)
 {
     HTMLEventObj *This = impl_from_IHTMLEventObj(iface);
+    DOMMouseEvent *mouse_event;
     cpp_bool ret = FALSE;

TRACE("(%p)->(%p)\n", This, p);

-    if(This->event && This->event->mouse_event)
-        return IDOMMouseEvent_get_altKey(&This->event->IDOMMouseEvent_iface, p);
+    if((mouse_event = unsafe_DOMMouseEvent_from_DOMEvent(This->event)))
+        return IDOMMouseEvent_get_altKey(&mouse_event->IDOMMouseEvent_iface, p);

if(This->event && This->event->keyboard_event)
         return IDOMKeyboardEvent_get_altKey(&This->event->IDOMKeyboardEvent_iface, p);
@@ -436,12 +454,13 @@ static HRESULT WINAPI HTMLEventObj_get_altKey(IHTMLEventObj *iface, VARIANT_BOOL
 static HRESULT WINAPI HTMLEventObj_get_ctrlKey(IHTMLEventObj *iface, VARIANT_BOOL *p)
 {
     HTMLEventObj *This = impl_from_IHTMLEventObj(iface);
+    DOMMouseEvent *mouse_event;
     cpp_bool ret = FALSE;

TRACE("(%p)->(%p)\n", This, p);

-    if(This->event && This->event->mouse_event)
-        return IDOMMouseEvent_get_ctrlKey(&This->event->IDOMMouseEvent_iface, p);
+    if((mouse_event = unsafe_DOMMouseEvent_from_DOMEvent(This->event)))
+        return IDOMMouseEvent_get_ctrlKey(&mouse_event->IDOMMouseEvent_iface, p);

if(This->event && This->event->keyboard_event)
         return IDOMKeyboardEvent_get_ctrlKey(&This->event->IDOMKeyboardEvent_iface, p);
@@ -453,12 +472,13 @@ static HRESULT WINAPI HTMLEventObj_get_ctrlKey(IHTMLEventObj *iface, VARIANT_BOO
 static HRESULT WINAPI HTMLEventObj_get_shiftKey(IHTMLEventObj *iface, VARIANT_BOOL *p)
 {
     HTMLEventObj *This = impl_from_IHTMLEventObj(iface);
+    DOMMouseEvent *mouse_event;
     cpp_bool ret = FALSE;

TRACE("(%p)->(%p)\n", This, p);

-    if(This->event && This->event->mouse_event)
-        return IDOMMouseEvent_get_shiftKey(&This->event->IDOMMouseEvent_iface, p);
+    if((mouse_event = unsafe_DOMMouseEvent_from_DOMEvent(This->event)))
+        return IDOMMouseEvent_get_shiftKey(&mouse_event->IDOMMouseEvent_iface, p);

if(This->event && This->event->keyboard_event)
         return IDOMKeyboardEvent_get_shiftKey(&This->event->IDOMKeyboardEvent_iface, p);
@@ -518,11 +538,12 @@ static HRESULT WINAPI HTMLEventObj_get_cancelBubble(IHTMLEventObj *iface, VARIAN
 static HRESULT WINAPI HTMLEventObj_get_fromElement(IHTMLEventObj *iface, IHTMLElement **p)
 {
     HTMLEventObj *This = impl_from_IHTMLEventObj(iface);
+    DOMMouseEvent *mouse_event;

TRACE("(%p)->(%p)\n", This, p);

-    if(This->event && This->event->mouse_event)
-        return IDOMMouseEvent_get_fromElement(&This->event->IDOMMouseEvent_iface, p);
+    if((mouse_event = unsafe_DOMMouseEvent_from_DOMEvent(This->event)))
+        return IDOMMouseEvent_get_fromElement(&mouse_event->IDOMMouseEvent_iface, p);

*p = NULL;
     return S_OK;
@@ -531,11 +552,12 @@ static HRESULT WINAPI HTMLEventObj_get_fromElement(IHTMLEventObj *iface, IHTMLEl
 static HRESULT WINAPI HTMLEventObj_get_toElement(IHTMLEventObj *iface, IHTMLElement **p)
 {
     HTMLEventObj *This = impl_from_IHTMLEventObj(iface);
+    DOMMouseEvent *mouse_event;

TRACE("(%p)->(%p)\n", This, p);

-    if(This->event && This->event->mouse_event)
-        return IDOMMouseEvent_get_toElement(&This->event->IDOMMouseEvent_iface, p);
+    if((mouse_event = unsafe_DOMMouseEvent_from_DOMEvent(This->event)))
+        return IDOMMouseEvent_get_toElement(&mouse_event->IDOMMouseEvent_iface, p);

*p = NULL;
     return S_OK;
@@ -564,13 +586,14 @@ static HRESULT WINAPI HTMLEventObj_get_keyCode(IHTMLEventObj *iface, LONG *p)
 static HRESULT WINAPI HTMLEventObj_get_button(IHTMLEventObj *iface, LONG *p)
 {
     HTMLEventObj *This = impl_from_IHTMLEventObj(iface);
+    DOMMouseEvent *mouse_event;
     USHORT button = 0;

TRACE("(%p)->(%p)\n", This, p);

-    if(This->event && This->event->mouse_event) {
+    if((mouse_event = unsafe_DOMMouseEvent_from_DOMEvent(This->event))) {
         HRESULT hres;
-        hres = IDOMMouseEvent_get_button(&This->event->IDOMMouseEvent_iface, &button);
+        hres = IDOMMouseEvent_get_button(&mouse_event->IDOMMouseEvent_iface, &button);
         if(FAILED(hres))
             return hres;
     }
@@ -662,11 +685,12 @@ static HRESULT WINAPI HTMLEventObj_get_y(IHTMLEventObj *iface, LONG *p)
 static HRESULT WINAPI HTMLEventObj_get_clientX(IHTMLEventObj *iface, LONG *p)
 {
     HTMLEventObj *This = impl_from_IHTMLEventObj(iface);
+    DOMMouseEvent *mouse_event;

TRACE("(%p)->(%p)\n", This, p);

-    if(This->event && This->event->mouse_event)
-        return IDOMMouseEvent_get_clientX(&This->event->IDOMMouseEvent_iface, p);
+    if((mouse_event = unsafe_DOMMouseEvent_from_DOMEvent(This->event)))
+        return IDOMMouseEvent_get_clientX(&mouse_event->IDOMMouseEvent_iface, p);

*p = 0;
     return S_OK;
@@ -675,11 +699,12 @@ static HRESULT WINAPI HTMLEventObj_get_clientX(IHTMLEventObj *iface, LONG *p)
 static HRESULT WINAPI HTMLEventObj_get_clientY(IHTMLEventObj *iface, LONG *p)
 {
     HTMLEventObj *This = impl_from_IHTMLEventObj(iface);
+    DOMMouseEvent *mouse_event;

TRACE("(%p)->(%p)\n", This, p);

-    if(This->event && This->event->mouse_event)
-        return IDOMMouseEvent_get_clientY(&This->event->IDOMMouseEvent_iface, p);
+    if((mouse_event = unsafe_DOMMouseEvent_from_DOMEvent(This->event)))
+        return IDOMMouseEvent_get_clientY(&mouse_event->IDOMMouseEvent_iface, p);

*p = 0;
     return S_OK;
@@ -688,11 +713,12 @@ static HRESULT WINAPI HTMLEventObj_get_clientY(IHTMLEventObj *iface, LONG *p)
 static HRESULT WINAPI HTMLEventObj_get_offsetX(IHTMLEventObj *iface, LONG *p)
 {
     HTMLEventObj *This = impl_from_IHTMLEventObj(iface);
+    DOMMouseEvent *mouse_event;

TRACE("(%p)->(%p)\n", This, p);

-    if(This->event && This->event->mouse_event)
-        return IDOMMouseEvent_get_offsetX(&This->event->IDOMMouseEvent_iface, p);
+    if((mouse_event = unsafe_DOMMouseEvent_from_DOMEvent(This->event)))
+        return IDOMMouseEvent_get_offsetX(&mouse_event->IDOMMouseEvent_iface, p);

*p = 0;
     return S_OK;
@@ -701,11 +727,12 @@ static HRESULT WINAPI HTMLEventObj_get_offsetX(IHTMLEventObj *iface, LONG *p)
 static HRESULT WINAPI HTMLEventObj_get_offsetY(IHTMLEventObj *iface, LONG *p)
 {
     HTMLEventObj *This = impl_from_IHTMLEventObj(iface);
+    DOMMouseEvent *mouse_event;

TRACE("(%p)->(%p)\n", This, p);

-    if(This->event && This->event->mouse_event)
-        return IDOMMouseEvent_get_offsetY(&This->event->IDOMMouseEvent_iface, p);
+    if((mouse_event = unsafe_DOMMouseEvent_from_DOMEvent(This->event)))
+        return IDOMMouseEvent_get_offsetY(&mouse_event->IDOMMouseEvent_iface, p);

*p = 0;
     return S_OK;
@@ -714,11 +741,12 @@ static HRESULT WINAPI HTMLEventObj_get_offsetY(IHTMLEventObj *iface, LONG *p)
 static HRESULT WINAPI HTMLEventObj_get_screenX(IHTMLEventObj *iface, LONG *p)
 {
     HTMLEventObj *This = impl_from_IHTMLEventObj(iface);
+    DOMMouseEvent *mouse_event;

TRACE("(%p)->(%p)\n", This, p);

-    if(This->event && This->event->mouse_event)
-        return IDOMMouseEvent_get_screenX(&This->event->IDOMMouseEvent_iface, p);
+    if((mouse_event = unsafe_DOMMouseEvent_from_DOMEvent(This->event)))
+        return IDOMMouseEvent_get_screenX(&mouse_event->IDOMMouseEvent_iface, p);

*p = 0;
     return S_OK;
@@ -727,11 +755,12 @@ static HRESULT WINAPI HTMLEventObj_get_screenX(IHTMLEventObj *iface, LONG *p)
 static HRESULT WINAPI HTMLEventObj_get_screenY(IHTMLEventObj *iface, LONG *p)
 {
     HTMLEventObj *This = impl_from_IHTMLEventObj(iface);
+    DOMMouseEvent *mouse_event;

TRACE("(%p)->(%p)\n", This, p);

-    if(This->event && This->event->mouse_event)
-        return IDOMMouseEvent_get_screenY(&This->event->IDOMMouseEvent_iface, p);
+    if((mouse_event = unsafe_DOMMouseEvent_from_DOMEvent(This->event)))
+        return IDOMMouseEvent_get_screenY(&mouse_event->IDOMMouseEvent_iface, p);

*p = 0;
     return S_OK;
@@ -851,8 +880,6 @@ static HRESULT WINAPI DOMEvent_QueryInterface(IDOMEvent *iface, REFIID riid, voi
         *ppv = &This->IDOMEvent_iface;
     else if(IsEqualGUID(&IID_IDOMEvent, riid))
         *ppv = &This->IDOMEvent_iface;
-    else if(This->mouse_event && IsEqualGUID(&IID_IDOMMouseEvent, riid))
-        *ppv = &This->IDOMMouseEvent_iface;
     else if(This->keyboard_event && IsEqualGUID(&IID_IDOMKeyboardEvent, riid))
         *ppv = &This->IDOMKeyboardEvent_iface;
     else if(dispex_query_interface(&This->dispex, riid, ppv))
@@ -887,8 +914,6 @@ static ULONG WINAPI DOMEvent_Release(IDOMEvent *iface)
     if(!ref) {
         if(This->destroy)
             This->destroy(This);
-        if(This->mouse_event)
-            nsIDOMMouseEvent_Release(This->mouse_event);
         if(This->keyboard_event)
             nsIDOMKeyEvent_Release(This->keyboard_event);
         if(This->target)
@@ -1311,47 +1336,47 @@ static void DOMUIEvent_destroy(DOMEvent *event)
     nsIDOMUIEvent_Release(This->nsevent);
 }

-static inline DOMEvent *impl_from_IDOMMouseEvent(IDOMMouseEvent *iface)
+static inline DOMMouseEvent *impl_from_IDOMMouseEvent(IDOMMouseEvent *iface)
 {
-    return CONTAINING_RECORD(iface, DOMEvent, IDOMMouseEvent_iface);
+    return CONTAINING_RECORD(iface, DOMMouseEvent, IDOMMouseEvent_iface);
 }

static HRESULT WINAPI DOMMouseEvent_QueryInterface(IDOMMouseEvent *iface, REFIID riid, void **ppv)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
-    return IDOMEvent_QueryInterface(&This->IDOMEvent_iface, riid, ppv);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
+    return IDOMEvent_QueryInterface(&This->ui_event.event.IDOMEvent_iface, riid, ppv);
 }

static ULONG WINAPI DOMMouseEvent_AddRef(IDOMMouseEvent *iface)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
-    return IDOMEvent_AddRef(&This->IDOMEvent_iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
+    return IDOMEvent_AddRef(&This->ui_event.event.IDOMEvent_iface);
 }

static ULONG WINAPI DOMMouseEvent_Release(IDOMMouseEvent *iface)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
-    return IDOMEvent_Release(&This->IDOMEvent_iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
+    return IDOMEvent_Release(&This->ui_event.event.IDOMEvent_iface);
 }

static HRESULT WINAPI DOMMouseEvent_GetTypeInfoCount(IDOMMouseEvent *iface, UINT *pctinfo)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
-    return IDispatchEx_GetTypeInfoCount(&This->dispex.IDispatchEx_iface, pctinfo);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
+    return IDispatchEx_GetTypeInfoCount(&This->ui_event.event.dispex.IDispatchEx_iface, pctinfo);
 }

static HRESULT WINAPI DOMMouseEvent_GetTypeInfo(IDOMMouseEvent *iface, UINT iTInfo,
                                                 LCID lcid, ITypeInfo **ppTInfo)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
-    return IDispatchEx_GetTypeInfo(&This->dispex.IDispatchEx_iface, iTInfo, lcid, ppTInfo);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
+    return IDispatchEx_GetTypeInfo(&This->ui_event.event.dispex.IDispatchEx_iface, iTInfo, lcid, ppTInfo);
 }

static HRESULT WINAPI DOMMouseEvent_GetIDsOfNames(IDOMMouseEvent *iface, REFIID riid,
         LPOLESTR *rgszNames, UINT cNames, LCID lcid, DISPID *rgDispId)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
-    return IDispatchEx_GetIDsOfNames(&This->dispex.IDispatchEx_iface, riid, rgszNames, cNames,
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
+    return IDispatchEx_GetIDsOfNames(&This->ui_event.event.dispex.IDispatchEx_iface, riid, rgszNames, cNames,
             lcid, rgDispId);
 }

@@ -1359,20 +1384,20 @@ static HRESULT WINAPI DOMMouseEvent_Invoke(IDOMMouseEvent *iface, DISPID dispIdM
         REFIID riid, LCID lcid, WORD wFlags, DISPPARAMS *pDispParams, VARIANT *pVarResult,
         EXCEPINFO *pExcepInfo, UINT *puArgErr)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
-    return IDispatchEx_Invoke(&This->dispex.IDispatchEx_iface, dispIdMember, riid, lcid,
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
+    return IDispatchEx_Invoke(&This->ui_event.event.dispex.IDispatchEx_iface, dispIdMember, riid, lcid,
             wFlags, pDispParams, pVarResult, pExcepInfo, puArgErr);
 }

static HRESULT WINAPI DOMMouseEvent_get_screenX(IDOMMouseEvent *iface, LONG *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     LONG screen_x;
     nsresult nsres;

TRACE("(%p)->(%p)\n", This, p);

-    nsres = nsIDOMMouseEvent_GetScreenX(This->mouse_event, &screen_x);
+    nsres = nsIDOMMouseEvent_GetScreenX(This->nsevent, &screen_x);
     if(NS_FAILED(nsres))
         return E_FAIL;

@@ -1382,13 +1407,13 @@ static HRESULT WINAPI DOMMouseEvent_get_screenX(IDOMMouseEvent *iface, LONG *p)

static HRESULT WINAPI DOMMouseEvent_get_screenY(IDOMMouseEvent *iface, LONG *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     LONG screen_y;
     nsresult nsres;

TRACE("(%p)->(%p)\n", This, p);

-    nsres = nsIDOMMouseEvent_GetScreenY(This->mouse_event, &screen_y);
+    nsres = nsIDOMMouseEvent_GetScreenY(This->nsevent, &screen_y);
     if(NS_FAILED(nsres))
         return E_FAIL;

@@ -1398,13 +1423,13 @@ static HRESULT WINAPI DOMMouseEvent_get_screenY(IDOMMouseEvent *iface, LONG *p)

static HRESULT WINAPI DOMMouseEvent_get_clientX(IDOMMouseEvent *iface, LONG *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     LONG client_x;
     nsresult nsres;

TRACE("(%p)->(%p)\n", This, p);

-    nsres = nsIDOMMouseEvent_GetClientX(This->mouse_event, &client_x);
+    nsres = nsIDOMMouseEvent_GetClientX(This->nsevent, &client_x);
     if(NS_FAILED(nsres))
         return E_FAIL;

@@ -1414,13 +1439,13 @@ static HRESULT WINAPI DOMMouseEvent_get_clientX(IDOMMouseEvent *iface, LONG *p)

static HRESULT WINAPI DOMMouseEvent_get_clientY(IDOMMouseEvent *iface, LONG *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     LONG client_y;
     nsresult nsres;

TRACE("(%p)->(%p)\n", This, p);

-    nsres = nsIDOMMouseEvent_GetClientY(This->mouse_event, &client_y);
+    nsres = nsIDOMMouseEvent_GetClientY(This->nsevent, &client_y);
     if(NS_FAILED(nsres))
         return E_FAIL;

@@ -1430,13 +1455,13 @@ static HRESULT WINAPI DOMMouseEvent_get_clientY(IDOMMouseEvent *iface, LONG *p)

static HRESULT WINAPI DOMMouseEvent_get_ctrlKey(IDOMMouseEvent *iface, VARIANT_BOOL *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     cpp_bool r;
     nsresult nsres;

TRACE("(%p)->(%p)\n", This, p);

-    nsres = nsIDOMMouseEvent_GetCtrlKey(This->mouse_event, &r);
+    nsres = nsIDOMMouseEvent_GetCtrlKey(This->nsevent, &r);
     if(NS_FAILED(nsres))
         return E_FAIL;

@@ -1446,13 +1471,13 @@ static HRESULT WINAPI DOMMouseEvent_get_ctrlKey(IDOMMouseEvent *iface, VARIANT_B

static HRESULT WINAPI DOMMouseEvent_get_shiftKey(IDOMMouseEvent *iface, VARIANT_BOOL *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     cpp_bool r;
     nsresult nsres;

TRACE("(%p)->(%p)\n", This, p);

-    nsres = nsIDOMMouseEvent_GetShiftKey(This->mouse_event, &r);
+    nsres = nsIDOMMouseEvent_GetShiftKey(This->nsevent, &r);
     if(NS_FAILED(nsres))
         return E_FAIL;

@@ -1462,13 +1487,13 @@ static HRESULT WINAPI DOMMouseEvent_get_shiftKey(IDOMMouseEvent *iface, VARIANT_

static HRESULT WINAPI DOMMouseEvent_get_altKey(IDOMMouseEvent *iface, VARIANT_BOOL *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     cpp_bool r;
     nsresult nsres;

TRACE("(%p)->(%p)\n", This, p);

-    nsres = nsIDOMMouseEvent_GetAltKey(This->mouse_event, &r);
+    nsres = nsIDOMMouseEvent_GetAltKey(This->nsevent, &r);
     if(NS_FAILED(nsres))
         return E_FAIL;

@@ -1478,13 +1503,13 @@ static HRESULT WINAPI DOMMouseEvent_get_altKey(IDOMMouseEvent *iface, VARIANT_BO

static HRESULT WINAPI DOMMouseEvent_get_metaKey(IDOMMouseEvent *iface, VARIANT_BOOL *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     cpp_bool r;
     nsresult nsres;

TRACE("(%p)->(%p)\n", This, p);

-    nsres = nsIDOMMouseEvent_GetMetaKey(This->mouse_event, &r);
+    nsres = nsIDOMMouseEvent_GetMetaKey(This->nsevent, &r);
     if(NS_FAILED(nsres))
         return E_FAIL;

@@ -1494,13 +1519,13 @@ static HRESULT WINAPI DOMMouseEvent_get_metaKey(IDOMMouseEvent *iface, VARIANT_B

static HRESULT WINAPI DOMMouseEvent_get_button(IDOMMouseEvent *iface, USHORT *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     INT16 r;
     nsresult nsres;

TRACE("(%p)->(%p)\n", This, p);

-    nsres = nsIDOMMouseEvent_GetButton(This->mouse_event, &r);
+    nsres = nsIDOMMouseEvent_GetButton(This->nsevent, &r);
     if(NS_FAILED(nsres))
         return E_FAIL;

@@ -1510,7 +1535,7 @@ static HRESULT WINAPI DOMMouseEvent_get_button(IDOMMouseEvent *iface, USHORT *p)

static HRESULT WINAPI DOMMouseEvent_get_relatedTarget(IDOMMouseEvent *iface, IEventTarget **p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     nsIDOMEventTarget *related_target;
     nsIDOMNode *target_node;
     HTMLDOMNode *node;
@@ -1519,7 +1544,7 @@ static HRESULT WINAPI DOMMouseEvent_get_relatedTarget(IDOMMouseEvent *iface, IEv

TRACE("(%p)->(%p)\n", This, p);

-    nsres = nsIDOMMouseEvent_GetRelatedTarget(This->mouse_event, &related_target);
+    nsres = nsIDOMMouseEvent_GetRelatedTarget(This->nsevent, &related_target);
     if(NS_FAILED(nsres))
         return E_FAIL;

@@ -1550,7 +1575,7 @@ static HRESULT WINAPI DOMMouseEvent_initMouseEvent(IDOMMouseEvent *iface, BSTR t
         VARIANT_BOOL alt_key, VARIANT_BOOL shift_key, VARIANT_BOOL meta_key, USHORT button,
         IEventTarget *related_target)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     nsIDOMEventTarget *nstarget = NULL;
     nsAString type_str;
     nsresult nsres;
@@ -1560,7 +1585,7 @@ static HRESULT WINAPI DOMMouseEvent_initMouseEvent(IDOMMouseEvent *iface, BSTR t
           can_bubble, cancelable, view, detail, screen_x, screen_y, client_x, client_y,
           ctrl_key, alt_key, shift_key, meta_key, button, related_target);

-    if(This->target) {
+    if(This->ui_event.event.target) {
         TRACE("called on already dispatched event\n");
         return S_OK;
     }
@@ -1574,10 +1599,10 @@ static HRESULT WINAPI DOMMouseEvent_initMouseEvent(IDOMMouseEvent *iface, BSTR t
             return hres;
     }

-    hres = IDOMEvent_initEvent(&This->IDOMEvent_iface, type, can_bubble, cancelable);
+    hres = IDOMEvent_initEvent(&This->ui_event.event.IDOMEvent_iface, type, can_bubble, cancelable);
     if(SUCCEEDED(hres)) {
         nsAString_InitDepend(&type_str, type);
-        nsres = nsIDOMMouseEvent_InitMouseEvent(This->mouse_event, &type_str, can_bubble, cancelable,
+        nsres = nsIDOMMouseEvent_InitMouseEvent(This->nsevent, &type_str, can_bubble, cancelable,
                                                 NULL /* FIXME */, detail, screen_x, screen_y,
                                                 client_x, client_y, !!ctrl_key, !!alt_key, !!shift_key,
                                                 !!meta_key, button, nstarget);
@@ -1596,20 +1621,20 @@ static HRESULT WINAPI DOMMouseEvent_initMouseEvent(IDOMMouseEvent *iface, BSTR t
 static HRESULT WINAPI DOMMouseEvent_getModifierState(IDOMMouseEvent *iface, BSTR key,
         VARIANT_BOOL *activated)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     FIXME("(%p)->(%s %p)\n", This, debugstr_w(key), activated);
     return E_NOTIMPL;
 }

static HRESULT WINAPI DOMMouseEvent_get_buttons(IDOMMouseEvent *iface, USHORT *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     UINT16 r;
     nsresult nsres;

TRACE("(%p)->(%p)\n", This, p);

-    nsres = nsIDOMMouseEvent_GetButtons(This->mouse_event, &r);
+    nsres = nsIDOMMouseEvent_GetButtons(This->nsevent, &r);
     if(NS_FAILED(nsres))
         return E_FAIL;

@@ -1619,17 +1644,18 @@ static HRESULT WINAPI DOMMouseEvent_get_buttons(IDOMMouseEvent *iface, USHORT *p

static HRESULT WINAPI DOMMouseEvent_get_fromElement(IDOMMouseEvent *iface, IHTMLElement **p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
+    eventid_t event_id = This->ui_event.event.event_id;
     IEventTarget  *related_target = NULL;

TRACE("(%p)->(%p)\n", This, p);

-    if(This->event_id != EVENTID_LAST) {
+    if(event_id != EVENTID_LAST) {
         HRESULT hres = S_OK;
-        if(event_info[This->event_id].flags & EVENT_MOUSE_FROM_RELATED)
+        if(event_info[event_id].flags & EVENT_MOUSE_FROM_RELATED)
             hres = IDOMMouseEvent_get_relatedTarget(&This->IDOMMouseEvent_iface, &related_target);
-        else if(event_info[This->event_id].flags & EVENT_MOUSE_TO_RELATED)
-            hres = IDOMEvent_get_target(&This->IDOMEvent_iface, &related_target);
+        else if(event_info[event_id].flags & EVENT_MOUSE_TO_RELATED)
+            hres = IDOMEvent_get_target(&This->ui_event.event.IDOMEvent_iface, &related_target);
         if(FAILED(hres))
             return hres;
     }
@@ -1645,17 +1671,18 @@ static HRESULT WINAPI DOMMouseEvent_get_fromElement(IDOMMouseEvent *iface, IHTML

static HRESULT WINAPI DOMMouseEvent_get_toElement(IDOMMouseEvent *iface, IHTMLElement **p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
+    eventid_t event_id = This->ui_event.event.event_id;
     IEventTarget  *related_target = NULL;

TRACE("(%p)->(%p)\n", This, p);

-    if(This->event_id != EVENTID_LAST) {
+    if(event_id != EVENTID_LAST) {
         HRESULT hres = S_OK;
-        if(event_info[This->event_id].flags & EVENT_MOUSE_TO_RELATED)
+        if(event_info[event_id].flags & EVENT_MOUSE_TO_RELATED)
             hres = IDOMMouseEvent_get_relatedTarget(&This->IDOMMouseEvent_iface, &related_target);
-        else if(event_info[This->event_id].flags & EVENT_MOUSE_FROM_RELATED)
-            hres = IDOMEvent_get_target(&This->IDOMEvent_iface, &related_target);
+        else if(event_info[event_id].flags & EVENT_MOUSE_FROM_RELATED)
+            hres = IDOMEvent_get_target(&This->ui_event.event.IDOMEvent_iface, &related_target);
         if(FAILED(hres))
             return hres;
     }
@@ -1671,21 +1698,21 @@ static HRESULT WINAPI DOMMouseEvent_get_toElement(IDOMMouseEvent *iface, IHTMLEl

static HRESULT WINAPI DOMMouseEvent_get_x(IDOMMouseEvent *iface, LONG *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     FIXME("(%p)->(%p)\n", This, p);
     return E_NOTIMPL;
 }

static HRESULT WINAPI DOMMouseEvent_get_y(IDOMMouseEvent *iface, LONG *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     FIXME("(%p)->(%p)\n", This, p);
     return E_NOTIMPL;
 }

static HRESULT WINAPI DOMMouseEvent_get_offsetX(IDOMMouseEvent *iface, LONG *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);

FIXME("(%p)->(%p) returning 0\n", This, p);

@@ -1695,7 +1722,7 @@ static HRESULT WINAPI DOMMouseEvent_get_offsetX(IDOMMouseEvent *iface, LONG *p)

static HRESULT WINAPI DOMMouseEvent_get_offsetY(IDOMMouseEvent *iface, LONG *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);

FIXME("(%p)->(%p) returning 0\n", This, p);

@@ -1705,13 +1732,13 @@ static HRESULT WINAPI DOMMouseEvent_get_offsetY(IDOMMouseEvent *iface, LONG *p)

static HRESULT WINAPI DOMMouseEvent_get_pageX(IDOMMouseEvent *iface, LONG *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     LONG r;
     nsresult nsres;

TRACE("(%p)->(%p)\n", This, p);

-    nsres = nsIDOMMouseEvent_GetPageX(This->mouse_event, &r);
+    nsres = nsIDOMMouseEvent_GetPageX(This->nsevent, &r);
     if(NS_FAILED(nsres))
         return E_FAIL;

@@ -1721,13 +1748,13 @@ static HRESULT WINAPI DOMMouseEvent_get_pageX(IDOMMouseEvent *iface, LONG *p)

static HRESULT WINAPI DOMMouseEvent_get_pageY(IDOMMouseEvent *iface, LONG *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     LONG r;
     nsresult nsres;

TRACE("(%p)->(%p)\n", This, p);

-    nsres = nsIDOMMouseEvent_GetPageY(This->mouse_event, &r);
+    nsres = nsIDOMMouseEvent_GetPageY(This->nsevent, &r);
     if(NS_FAILED(nsres))
         return E_FAIL;

@@ -1737,13 +1764,13 @@ static HRESULT WINAPI DOMMouseEvent_get_pageY(IDOMMouseEvent *iface, LONG *p)

static HRESULT WINAPI DOMMouseEvent_get_layerX(IDOMMouseEvent *iface, LONG *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     nsresult nsres;
     LONG r;

TRACE("(%p)->(%p)\n", This, p);

-    nsres = nsIDOMMouseEvent_GetLayerX(This->mouse_event, &r);
+    nsres = nsIDOMMouseEvent_GetLayerX(This->nsevent, &r);
     if(NS_FAILED(nsres))
         return E_FAIL;

@@ -1753,13 +1780,13 @@ static HRESULT WINAPI DOMMouseEvent_get_layerX(IDOMMouseEvent *iface, LONG *p)

static HRESULT WINAPI DOMMouseEvent_get_layerY(IDOMMouseEvent *iface, LONG *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     nsresult nsres;
     LONG r;

TRACE("(%p)->(%p)\n", This, p);

-    nsres = nsIDOMMouseEvent_GetLayerY(This->mouse_event, &r);
+    nsres = nsIDOMMouseEvent_GetLayerY(This->nsevent, &r);
     if(NS_FAILED(nsres))
         return E_FAIL;

@@ -1769,13 +1796,13 @@ static HRESULT WINAPI DOMMouseEvent_get_layerY(IDOMMouseEvent *iface, LONG *p)

static HRESULT WINAPI DOMMouseEvent_get_which(IDOMMouseEvent *iface, USHORT *p)
 {
-    DOMEvent *This = impl_from_IDOMMouseEvent(iface);
+    DOMMouseEvent *This = impl_from_IDOMMouseEvent(iface);
     UINT32 r;
     nsresult nsres;

TRACE("(%p)->(%p)\n", This, p);

-    nsres = nsIDOMMouseEvent_GetWhich(This->mouse_event, &r);
+    nsres = nsIDOMMouseEvent_GetWhich(This->nsevent, &r);
     if(NS_FAILED(nsres))
         return E_FAIL;

@@ -1817,6 +1844,23 @@ static const IDOMMouseEventVtbl DOMMouseEventVtbl = {
     DOMMouseEvent_get_which
 };

+static void *DOMMouseEvent_query_interface(DOMEvent *event, REFIID riid)
+{
+    DOMMouseEvent *This = DOMMouseEvent_from_DOMEvent(event);
+    if(IsEqualGUID(&IID_IDOMMouseEvent, riid))
+        return &This->IDOMMouseEvent_iface;
+    if(IsEqualGUID(&IID_IDOMUIEvent, riid))
+        return &This->ui_event.IDOMUIEvent_iface;
+    return NULL;
+}
+
+static void DOMMouseEvent_destroy(DOMEvent *event)
+{
+    DOMMouseEvent *This = DOMMouseEvent_from_DOMEvent(event);
+    DOMUIEvent_destroy(&This->ui_event.event);
+    nsIDOMMouseEvent_Release(This->nsevent);
+}
+
 static inline DOMEvent *impl_from_IDOMKeyboardEvent(IDOMKeyboardEvent *iface)
 {
     return CONTAINING_RECORD(iface, DOMEvent, IDOMKeyboardEvent_iface);
@@ -2540,6 +2584,12 @@ dispex_static_data_t DOMProgressEvent_dispex = {
     DOMProgressEvent_iface_tids
 };

+static void fill_parent_ui_event(void *iface, DOMUIEvent *ui_event)
+{
+    ui_event->IDOMUIEvent_iface.lpVtbl = &DOMUIEventVtbl;
+    nsISupports_QueryInterface(iface, &IID_nsIDOMUIEvent, (void**)&ui_event->nsevent);
+}
+
 static void ui_event_ctor(void *event, void *iface)
 {
     DOMUIEvent *ui_event = event;
@@ -2547,6 +2597,14 @@ static void ui_event_ctor(void *event, void *iface)
     ui_event->nsevent = iface;
 }

+static void mouse_event_ctor(void *event, void *iface)
+{
+    DOMMouseEvent *mouse_event = event;
+    mouse_event->IDOMMouseEvent_iface.lpVtbl = &DOMMouseEventVtbl;
+    mouse_event->nsevent = iface;
+    fill_parent_ui_event(iface, &mouse_event->ui_event);
+}
+
 static void custom_event_ctor(void *event, void *iface)
 {
     DOMCustomEvent *custom_event = event;
@@ -2572,6 +2630,8 @@ static DOMEvent *alloc_event(nsIDOMEvent *nsevent, compat_mode_t compat_mode, ev
         unsigned size;
         compat_mode_t compat_mode;
     } types_table[] = {
+        { &IID_nsIDOMMouseEvent,        &DOMMouseEvent_dispex,        mouse_event_ctor,        DOMMouseEvent_query_interface,
+          DOMMouseEvent_destroy,        sizeof(DOMMouseEvent) },
         { &IID_nsIDOMUIEvent,           &DOMUIEvent_dispex,           ui_event_ctor,           DOMUIEvent_query_interface,
           DOMUIEvent_destroy,           sizeof(DOMUIEvent) },
         { &IID_nsIDOMCustomEvent,       &DOMCustomEvent_dispex,       custom_event_ctor,       DOMCustomEvent_query_interface,
@@ -2620,7 +2680,6 @@ static DOMEvent *alloc_event(nsIDOMEvent *nsevent, compat_mode_t compat_mode, ev
     }

event->IDOMEvent_iface.lpVtbl = &DOMEventVtbl;
-    event->IDOMMouseEvent_iface.lpVtbl = &DOMMouseEventVtbl;
     event->IDOMKeyboardEvent_iface.lpVtbl = &DOMKeyboardEventVtbl;
     event->ref = 1;
     event->event_id = event_id;
@@ -2637,12 +2696,6 @@ static DOMEvent *alloc_event(nsIDOMEvent *nsevent, compat_mode_t compat_mode, ev

event->time_stamp = get_time_stamp();

-    nsres = nsIDOMEvent_QueryInterface(nsevent, &IID_nsIDOMMouseEvent, (void**)&event->mouse_event);
-    if(NS_SUCCEEDED(nsres))
-        dispex_data = &DOMMouseEvent_dispex;
-    else
-        event->mouse_event = NULL;
-
     nsres = nsIDOMEvent_QueryInterface(nsevent, &IID_nsIDOMKeyEvent, (void**)&event->keyboard_event);
     if(NS_SUCCEEDED(nsres))
         dispex_data = &DOMKeyboardEvent_dispex;
diff --git a/dlls/mshtml/htmlevent.h b/dlls/mshtml/htmlevent.h
index 26c6d353011..207c0a7aaab 100644
--- a/dlls/mshtml/htmlevent.h
+++ b/dlls/mshtml/htmlevent.h
@@ -67,7 +67,6 @@ typedef enum {
 typedef struct DOMEvent {
     DispatchEx dispex;
     IDOMEvent IDOMEvent_iface;
-    IDOMMouseEvent IDOMMouseEvent_iface;
     IDOMKeyboardEvent IDOMKeyboardEvent_iface;

LONG ref;
@@ -75,7 +74,6 @@ typedef struct DOMEvent {
     void (*destroy)(struct DOMEvent*);

nsIDOMEvent *nsevent;
-    nsIDOMMouseEvent *mouse_event;
     nsIDOMKeyEvent *keyboard_event;

eventid_t event_id;