Moving the mouse-wheel processing code out of the FocusManager

chrome/browser/renderer_host/render_widget_host_view_win.cc

 // Copyright (c) 2006-2008 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 "base/command_line.h"
 #include "base/gfx/gdi_util.h"
 #include "base/gfx/rect.h"
 #include "base/histogram.h"
 #include "base/win_util.h"
 #include "chrome/browser/browser_accessibility.h"
 #include "chrome/browser/browser_accessibility_manager.h"
 #include "chrome/browser/browser_trial.h"
 #include "chrome/browser/renderer_host/backing_store.h"
 #include "chrome/browser/renderer_host/render_process_host.h"
 #include "chrome/browser/renderer_host/render_widget_host.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/gfx/chrome_canvas.h"
 #include "chrome/common/l10n_util.h"
 #include "chrome/common/l10n_util_win.h"
 #include "chrome/common/native_web_keyboard_event.h"
 #include "chrome/common/plugin_messages.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/resource_bundle.h"
 #include "chrome/common/win_util.h"
+#include "chrome/views/focus/focus_util_win.h"
 // Included for views::kReflectedMessage - TODO(beng): move this to win_util.h!
 #include "chrome/views/widget/widget_win.h"
 #include "grit/webkit_resources.h"
 #include "webkit/glue/plugins/plugin_constants_win.h"
 #include "webkit/glue/plugins/webplugin_delegate_impl.h"
 #include "webkit/glue/webcursor.h"
 
 
 using base::TimeDelta;
 using base::TimeTicks;
@@ skipping 422 matching lines @@
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewWin, private:
 
 LRESULT RenderWidgetHostViewWin::OnCreate(CREATESTRUCT* create_struct) {
   // Call the WM_INPUTLANGCHANGE message handler to initialize the input locale
   // of a browser process.
   OnInputLangChange(0, 0);
   TRACK_HWND_CREATION(m_hWnd);
+  // Marks that window as supporting mouse-wheel messages rerouting so it is
+  // scrolled when under the mouse pointer even if inactive.
+  views::SetWindowSupportsRerouteMouseWheel(m_hWnd);
   return 0;
 }
 
 void RenderWidgetHostViewWin::OnActivate(UINT action, BOOL minimized,
                                          HWND window) {
   // If the container is a popup, clicking elsewhere on screen should close the
   // popup.
   if (close_on_deactivate_ && action == WA_INACTIVE) {
     // Send a windows message so that any derived classes
     // will get a change to override the default handling
@@ skipping 382 matching lines @@
   // messages even if we are not in the foreground. So here we check if
   // we have any owned popup windows in the foreground and dismiss them.
   if (m_hWnd != GetForegroundWindow()) {
     HWND toplevel_hwnd = ::GetAncestor(m_hWnd, GA_ROOT);
     EnumThreadWindows(
         GetCurrentThreadId(),
         DismissOwnedPopups,
         reinterpret_cast<LPARAM>(toplevel_hwnd));
   }
 
+  // Forward the mouse-wheel message to the window under the mouse if it belongs
+  // to us.
+  if (message == WM_MOUSEWHEEL &&
+      views::RerouteMouseWheel(m_hWnd, wparam, lparam)) {
+    handled = TRUE;
+    return 0;
+  }
+
   // This is a bit of a hack, but will work for now since we don't want to
   // pollute this object with WebContents-specific functionality...
   bool handled_by_webcontents = false;
   if (GetParent()) {
     // Use a special reflected message to break recursion. If we send
     // WM_MOUSEWHEEL, the focus manager subclass of web contents will
     // route it back here.
     MSG new_message = {0};
     new_message.hwnd = m_hWnd;
     new_message.message = message;
@@ skipping 181 matching lines @@
     // WM_LBUTTONDOWN.
     SetFocus();
   }
 }
 
 void RenderWidgetHostViewWin::ShutdownHost() {
   shutdown_factory_.RevokeAll();
   render_widget_host_->Shutdown();
   // Do not touch any members at this point, |this| has been deleted.
 }