Add scroll and gesture message filters for UIPI Flash.

chrome/browser/renderer_host/render_widget_host_view_win.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/renderer_host/render_widget_host_view_win.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/i18n/rtl.h"
@@ skipping 428 matching lines @@
     wcex.hIcon          = 0;
     wcex.hCursor        = 0;
     wcex.hbrBackground  = reinterpret_cast<HBRUSH>(COLOR_WINDOW+1);
     wcex.lpszMenuName   = 0;
     wcex.lpszClassName  = webkit::npapi::kWrapperNativeWindowClassName;
     wcex.hIconSm        = 0;
     window_class = RegisterClassEx(&wcex);
   }
   DCHECK(window_class);
 
+  HWND orig_parent = ::GetParent(window);
   HWND parent = CreateWindowEx(
       WS_EX_LEFT | WS_EX_LTRREADING | WS_EX_RIGHTSCROLLBAR,
       MAKEINTATOM(window_class), 0,
       WS_CHILD | WS_CLIPCHILDREN | WS_CLIPSIBLINGS,
-      0, 0, 0, 0, ::GetParent(window), 0, GetModuleHandle(NULL), 0);
+      0, 0, 0, 0, orig_parent, 0, GetModuleHandle(NULL), 0);
   ui::CheckWindowCreated(parent);
+  // If UIPI is enabled we need to add message filters for parents with
+  // children that cross process boundaries.
+  if (::GetPropW(orig_parent, webkit::npapi::kNativeWindowClassFilterProp)) {
+    // Process-wide message filters required on Vista must be added to:
+    // chrome_content_client.cc ChromeContentClient::SandboxPlugin
+    typedef BOOL (WINAPI *ChangeWindowMessageFilterExFunction)(
+        HWND hwnd,
+        UINT message,
+        DWORD action,
+        PCHANGEFILTERSTRUCT change_filter_struct);
+    static ChangeWindowMessageFilterExFunction s_ChangeWindowMessageFilterEx =

[M-A Ruel, 2011/08/12 23:50:05]

Say No! to local static variables! In incurs a global variable look up at each
first access in the function everytime the function is called.

Actually, why are you making it static if it is to set its value at each
function call?

+        reinterpret_cast<ChangeWindowMessageFilterExFunction>(
+            ::GetProcAddress(::GetModuleHandle(L"user32.dll"),
+                             "ChangeWindowMessageFilterEx"));
+    // Process-wide message filters required on Vista must be added to:
+    // chrome_content_client.cc ChromeContentClient::SandboxPlugin
+    s_ChangeWindowMessageFilterEx(parent, WM_MOUSEWHEEL, MSGFLT_ALLOW, NULL);
+    s_ChangeWindowMessageFilterEx(parent, WM_GESTURE, MSGFLT_ALLOW, NULL);
+    ::SetPropW(orig_parent, webkit::npapi::kNativeWindowClassFilterProp, NULL);
+  }
   ::SetParent(window, parent);
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       new NotifyPluginProcessHostTask(window, parent));
   return parent;
 }
 
 static BOOL CALLBACK AddChildWindowToVector(HWND hwnd, LPARAM lparam) {
   std::vector<HWND>* vector = reinterpret_cast<std::vector<HWND>*>(lparam);
   vector->push_back(hwnd);
@@ skipping 1362 matching lines @@
                                                       DWORD ex_style) {
   parent_hwnd_ = parent_hwnd;
   Create(parent_hwnd_, NULL, NULL, WS_POPUP, ex_style);
   MoveWindow(pos.x(), pos.y(), pos.width(), pos.height(), TRUE);
   // To show tooltip on popup window.(e.g. title in <select>)
   // Popups default to showing, which means |DidBecomeSelected()| isn't invoked.
   // Ensure the tooltip is created otherwise tooltips are never shown.
   EnsureTooltip();
   ShowWindow(IsActivatable() ? SW_SHOW : SW_SHOWNA);
 }