ieframe: Send command state change notifications from history navigation handlers.

dlls/ieframe/ieframe.h

@@ -273,6 +273,7 @@ HRESULT dochost_object_available(DocHost*,IUnknown*) DECLSPEC_HIDDEN;
 void set_doc_state(DocHost*,READYSTATE) DECLSPEC_HIDDEN;
 void deactivate_document(DocHost*) DECLSPEC_HIDDEN;
 void create_doc_view_hwnd(DocHost*) DECLSPEC_HIDDEN;
+void on_commandstate_change(DocHost*,LONG,VARIANT_BOOL) DECLSPEC_HIDDEN;
 
 #define WM_DOCHOSTTASK (WM_USER+0x300)
 void push_dochost_task(DocHost*,task_header_t*,task_proc_t,task_destr_t,BOOL) DECLSPEC_HIDDEN;

dlls/ieframe/navigate.c

@@ -773,6 +773,27 @@ static void doc_navigate_task_destr(task_header_t *t)
     heap_free(task);
 }
 
+void on_commandstate_change(DocHost *doc_host, LONG command, VARIANT_BOOL enable)
+{
+    DISPPARAMS dispparams;
+    VARIANTARG params[2];
+
+    TRACE("command=%d enable=%d\n", command, enable);
+
+    dispparams.cArgs = 2;
+    dispparams.cNamedArgs = 0;
+    dispparams.rgdispidNamedArgs = NULL;
+    dispparams.rgvarg = params;
+
+    V_VT(params) = VT_BOOL;
+    V_BOOL(params) = enable;
+
+    V_VT(params+1) = VT_I4;
+    V_I4(params+1) = command;
+
+    call_sink(doc_host->cps.wbe2, DISPID_COMMANDSTATECHANGE, &dispparams);
+}
+
 static void doc_navigate_proc(DocHost *This, task_header_t *t)
 {
     task_doc_navigate_t *task = (task_doc_navigate_t*)t;
@@ -876,6 +897,9 @@ static HRESULT navigate_bsc(DocHost *This, BindStatusCallback *bsc, IMoniker *mo
         return S_OK;
     }
 
+    on_commandstate_change(This, CSC_NAVIGATEBACK, VARIANT_FALSE);
+    on_commandstate_change(This, CSC_NAVIGATEFORWARD, VARIANT_FALSE);
+
     if(This->document)
         deactivate_document(This);
 
@@ -1069,6 +1093,17 @@ static HRESULT navigate_history(DocHost *This, unsigned travellog_pos)
         return E_NOTIMPL;
     }
 
+    if (travellog_pos < This->travellog.position)
+    {
+        on_commandstate_change(This, CSC_NAVIGATEBACK, VARIANT_FALSE);
+        on_commandstate_change(This, CSC_NAVIGATEFORWARD, VARIANT_TRUE);
+    }
+    else if (travellog_pos > This->travellog.position)
+    {
+        on_commandstate_change(This, CSC_NAVIGATEBACK, VARIANT_TRUE);
+        on_commandstate_change(This, CSC_NAVIGATEFORWARD, VARIANT_FALSE);
+    }
+
     This->travellog.loading_pos = travellog_pos;
     entry = This->travellog.log + This->travellog.loading_pos;
 

dlls/ieframe/oleobject.c

@@ -442,6 +442,9 @@ static HRESULT WINAPI OleObject_SetClientSite(IOleObject *iface, LPOLECLIENTSITE
     release_client_site(This);
 
     if(!pClientSite) {
+        on_commandstate_change(&This->doc_host, CSC_NAVIGATEBACK, VARIANT_FALSE);
+        on_commandstate_change(&This->doc_host, CSC_NAVIGATEFORWARD, VARIANT_FALSE);
+
         if(This->doc_host.document)
             deactivate_document(&This->doc_host);
         return S_OK;