Add widget utils extension
authorOleg Romashin <romaxa@gmail.com>
Tue, 22 Apr 2008 13:14:31 +0300
changeset 16908 53d429d60ab56e77e30342f42ee1d3b909746cfa
parent 16901 5e41bb64857be7e0f79dca19af29d1907338cd60
child 16909 557609aeffb2a391d174244b0ee0da5d8938c282
push idunknown
push userunknown
push dateunknown
milestone2.0a1pre
Add widget utils extension First panning util implemented
extensions/widgetutils/Makefile.in
extensions/widgetutils/install.rdf
extensions/widgetutils/src/Makefile.in
extensions/widgetutils/src/nsWidgetUtils.cpp
new file mode 100644
--- /dev/null
+++ b/extensions/widgetutils/Makefile.in
@@ -0,0 +1,33 @@
+
+DEPTH=../..
+topsrcdir=@top_srcdir@
+srcdir=@srcdir@
+VPATH=@srcdir@
+
+include $(DEPTH)/config/autoconf.mk
+
+MODULE	= widgetutils
+XPI_NAME = widgetutils
+
+ifdef MOZ_XUL_APP
+INSTALL_EXTENSION_ID = widgetutils@extensions.mozilla.org
+DIST_FILES = install.rdf
+NO_JAR_AUTO_REG        = 1
+USE_EXTENSION_MANIFEST = 1
+XPI_PKGNAME            = widgetutils-$(MOZ_APP_VERSION)
+
+XULAPP_DEFINES = \
+	-DFIREFOX_VERSION=$(FIREFOX_VERSION) \
+	-DTHUNDERBIRD_VERSION=$(THUNDERBIRD_VERSION) \
+	-DEXTENSION_VERSION=$(MOZILLA_VERSION) \
+	$(NULL)
+
+ifdef TARGET_XPCOM_ABI
+XULAPP_DEFINES += -DEM_ABI=$(OS_TARGET)_$(TARGET_XPCOM_ABI)
+endif
+endif
+
+DIRS    = src
+#DIRS   += public
+
+include $(topsrcdir)/config/rules.mk
new file mode 100644
--- /dev/null
+++ b/extensions/widgetutils/install.rdf
@@ -0,0 +1,40 @@
+<?xml version="1.0"?>
+
+#filter substitution
+
+<RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+     xmlns:em="http://www.mozilla.org/2004/em-rdf#">
+  <Description about="urn:mozilla:install-manifest">
+    <em:id>widgetutils@extensions.mozilla.org</em:id>
+    <em:version>@EXTENSION_VERSION@</em:version>
+
+#ifdef EM_ABI
+    <em:targetPlatform>@EM_ABI@</em:targetPlatform>
+#endif
+
+    <em:targetApplication>
+      <!-- Firefox -->
+      <Description>
+        <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
+        <em:minVersion>@FIREFOX_VERSION@</em:minVersion>
+        <em:maxVersion>@FIREFOX_VERSION@</em:maxVersion>
+      </Description>
+    </em:targetApplication>
+
+    <em:targetApplication>
+      <!-- Thunderbird -->
+      <Description>
+        <em:id>{3550f703-e582-4d05-9a08-453d09bdfdc6}</em:id>
+        <em:minVersion>@THUNDERBIRD_VERSION@</em:minVersion>
+        <em:maxVersion>@THUNDERBIRD_VERSION@</em:maxVersion>
+      </Description>
+    </em:targetApplication>
+
+    <!-- front-end metadata -->
+    <em:name>WidgetUtils service</em:name>
+    <em:description>Provide scrolling by mouse feature.</em:description>
+    <em:creator>mozilla.org</em:creator>
+    <em:contributor>Oleg Romashin &lt;romaxa@gmail.com&gt;</em:contributor>
+    <em:homepageURL>http://hg.mozilla.org</em:homepageURL>
+  </Description>
+</RDF>
new file mode 100644
--- /dev/null
+++ b/extensions/widgetutils/src/Makefile.in
@@ -0,0 +1,91 @@
+# vim:set ts=8 sw=8 sts=8 noet:
+# ***** BEGIN LICENSE BLOCK *****
+# Version: MPL 1.1/GPL 2.0/LGPL 2.1
+#
+# The contents of this file are subject to the Mozilla Public License Version
+# 1.1 (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+# http://www.mozilla.org/MPL/
+#
+# Software distributed under the License is distributed on an "AS IS" basis,
+# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+# for the specific language governing rights and limitations under the
+# License.
+#
+# The Original Code is the Mozilla Browser code.
+#
+# The Initial Developer of the Original Code is Google Inc.
+# Portions created by the Initial Developer are Copyright (C) 2005
+# the Initial Developer. All Rights Reserved.
+#
+# Contributor(s):
+#  Oleg Romashin <romaxa@gmail.com>
+#
+# Alternatively, the contents of this file may be used under the terms of
+# either the GNU General Public License Version 2 or later (the "GPL"), or
+# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+# in which case the provisions of the GPL or the LGPL are applicable instead
+# of those above. If you wish to allow use of your version of this file only
+# under the terms of either the GPL or the LGPL, and not to allow others to
+# use your version of this file under the terms of the MPL, indicate your
+# decision by deleting the provisions above and replace them with the notice
+# and other provisions required by the GPL or the LGPL. If you do not delete
+# the provisions above, a recipient may use your version of this file under
+# the terms of any one of the MPL, the GPL or the LGPL.
+#
+# ***** END LICENSE BLOCK *****
+
+DEPTH		= ../../..
+topsrcdir	= @top_srcdir@
+srcdir		= @srcdir@
+VPATH		= @srcdir@
+
+include $(DEPTH)/config/autoconf.mk
+
+MODULE		= widgetutils
+XPI_NAME	= widgetutils
+LIBRARY_NAME    = widgetutils
+ifneq ($(OS_ARCH),WINNT)
+SHORT_LIBNAME = widgetutils
+endif
+FORCE_SHARED_LIB = 1
+IS_COMPONENT = 1
+
+REQUIRES = \
+	dom \
+	layout \
+	content \
+	widget \
+	necko \
+	windowwatcher \
+	xpcom \
+	string \
+	pref \
+	gfx \
+	locale \
+	docshell \
+	uriloader \
+	webbrwsr \
+	imglib2 \
+	view \
+	$(NULL)
+
+CPPSRCS		= nsWidgetUtils.cpp
+
+EXTRA_DSO_LDOPTS = \
+	$(XPCOM_GLUE_LDOPTS) \
+	$(NSPR_LIBS) \
+	$(NULL)
+
+EXTRA_DSO_LDOPTS += $(MOZ_COMPONENT_LIBS)
+
+EXPORT_RESOURCE = \
+	$(NULL)
+
+ifdef TARGET_XPCOM_ABI
+FINAL_TARGET=$(DIST)/xpi-stage/$(XPI_NAME)/platform/$(OS_TARGET)_$(TARGET_XPCOM_ABI)
+endif
+
+#EXTRA_COMPONENTS = $(srcdir)/SimpleTest.js
+
+include $(topsrcdir)/config/rules.mk
new file mode 100644
--- /dev/null
+++ b/extensions/widgetutils/src/nsWidgetUtils.cpp
@@ -0,0 +1,477 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 tw=80 et cindent: */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla's Element Optimizeing extension.
+ *
+ * The Initial Developer of the Original Code is the Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2006
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Oleg Romashin <romaxa@gmail.com> (original author)
+ *   Brad Lassey <blassey@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "nsCURILoader.h"
+#include "nsICategoryManager.h"
+#include "nsIDOMAbstractView.h"
+#include "nsIDOMDocument.h"
+#include "nsIDOMDocumentView.h"
+#include "nsIDOMHTMLElement.h"
+#include "nsIDOMHTMLIFrameElement.h"
+#include "nsIDOMNSDocument.h"
+#include "nsIDOMNSElement.h"
+#include "nsIDOMNSHTMLElement.h"
+#include "nsIDOMNode.h"
+#include "nsIDOMNodeList.h"
+#include "nsIDOMWindow.h"
+#include "nsIDOMWindowCollection.h"
+#include "nsIDocument.h"
+#include "nsIGenericFactory.h"
+#include "nsIObserver.h"
+#include "nsIPref.h"
+#include "nsIPresShell.h"
+#include "nsIStyleSheetService.h"
+#include "nsIWebProgress.h"
+#include "nsIWebProgressListener.h"
+#include "nsIWindowWatcher.h"
+#include "nsNetUtil.h"
+#include "nsRect.h"
+#include "nsStringGlue.h"
+#include "nsWeakReference.h"
+#include "nsIWebBrowser.h"
+#include "nsIObserverService.h"
+#include "nsIDOMEventTarget.h"
+#include "nsPIDOMWindow.h"
+#include "nsIDOMWindow.h"
+//#include ".h"
+#include "nsIDOM3EventTarget.h"
+#include "nsIDOMKeyListener.h"
+#include "nsIDOMCompositionListener.h"
+#include "nsIDOMTextListener.h"
+#include "nsIDOMMouseMotionListener.h"
+#include "nsIDOMMouseListener.h"
+#include "nsIDOMMouseEvent.h"
+#include "nsIView.h"
+#include "nsGUIEvent.h"
+#include "nsIViewManager.h"
+
+const int MIN_INT =((int) (1 << (sizeof(int) * 8 - 1)));
+
+static int g_lastX=MIN_INT;
+static int g_lastY=MIN_INT;
+
+#define EM_MULT 16.
+#define NS_FRAME_HAS_RELATIVE_SIZE 0x01000000
+#define NS_FRAME_HAS_OPTIMIZEDVIEW 0x02000000
+
+// TODO auto reload nsWidgetUtils in C.
+class nsWidgetUtils : public nsIObserver,
+                      public nsIDOMMouseMotionListener,
+                      public nsIDOMMouseListener,
+                      public nsSupportsWeakReference
+{
+public:
+  nsWidgetUtils();
+  virtual ~nsWidgetUtils();
+  nsresult Init(void);
+  nsresult GetDOMWindowByNode(nsIDOMNode *aNode, nsIDOMWindow * *aDOMWindow);
+
+  void RemoveWindowListeners(nsIDOMWindow *aDOMWin);
+  void GetChromeEventHandler(nsIDOMWindow *aDOMWin, nsIDOMEventTarget **aChromeTarget);
+  void AttachWindowListeners(nsIDOMWindow *aDOMWin);
+
+  // nsIDOMMouseMotionListener
+  NS_IMETHOD MouseMove(nsIDOMEvent* aDOMEvent);
+  NS_IMETHOD DragMove(nsIDOMEvent* aMouseEvent);
+  NS_IMETHOD HandleEvent(nsIDOMEvent* aDOMEvent);
+
+  // nsIDOMMouseListener
+  NS_IMETHOD MouseDown(nsIDOMEvent* aDOMEvent);
+  NS_IMETHOD MouseUp(nsIDOMEvent* aDOMEvent);
+  NS_IMETHOD MouseClick(nsIDOMEvent* aDOMEvent);
+  NS_IMETHOD MouseDblClick(nsIDOMEvent* aDOMEvent);
+  NS_IMETHOD MouseOver(nsIDOMEvent* aDOMEvent);
+  NS_IMETHOD MouseOut(nsIDOMEvent* aDOMEvent);
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIOBSERVER
+};
+
+nsWidgetUtils::nsWidgetUtils()
+{
+  Init();
+}
+
+NS_IMETHODIMP
+nsWidgetUtils::Init()
+{
+  nsresult rv;
+  nsCOMPtr<nsIObserverService> obsSvc =
+    do_GetService("@mozilla.org/observer-service;1");
+  NS_ENSURE_STATE(obsSvc);
+
+  rv = obsSvc->AddObserver(this, "domwindowopened", PR_FALSE);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = obsSvc->AddObserver(this, "domwindowclosed", PR_FALSE);
+  NS_ENSURE_SUCCESS(rv, rv);
+}
+
+NS_IMETHODIMP
+nsWidgetUtils::HandleEvent(nsIDOMEvent* aDOMEvent)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsWidgetUtils::MouseDown(nsIDOMEvent* aDOMEvent)
+{
+  nsCOMPtr <nsIDOMMouseEvent> mouseEvent;
+  mouseEvent = do_QueryInterface(aDOMEvent);
+  if (!mouseEvent)
+    return NS_OK;
+
+  ((nsIDOMMouseEvent*)mouseEvent)->GetScreenX(&g_lastX);
+  ((nsIDOMMouseEvent*)mouseEvent)->GetScreenY(&g_lastY);
+  // Return TRUE from your signal handler to mark the event as consumed.
+  // PRBool return_val = PR_FALSE;
+  // if (return_val) {
+  //   aDOMEvent->StopPropagation();
+  //   aDOMEvent->PreventDefault();
+  // }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsWidgetUtils::MouseUp(nsIDOMEvent* aDOMEvent)
+{
+  nsCOMPtr <nsIDOMMouseEvent> mouseEvent;
+  mouseEvent = do_QueryInterface(aDOMEvent);
+  if (!mouseEvent)
+    return NS_OK;
+  // Return TRUE from your signal handler to mark the event as consumed.
+  g_lastX = MIN_INT;
+  g_lastY = MIN_INT;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsWidgetUtils::MouseClick(nsIDOMEvent* aDOMEvent)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsWidgetUtils::MouseDblClick(nsIDOMEvent* aDOMEvent)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsWidgetUtils::MouseOver(nsIDOMEvent* aDOMEvent)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsWidgetUtils::MouseOut(nsIDOMEvent* aDOMEvent)
+{
+  return NS_OK;
+}
+
+nsresult
+nsWidgetUtils::GetDOMWindowByNode(nsIDOMNode *aNode, nsIDOMWindow * *aDOMWindow)
+{
+  nsresult rv;
+  nsCOMPtr<nsIDOMDocument> nodeDoc;
+  rv = aNode->GetOwnerDocument(getter_AddRefs(nodeDoc));
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsIDOMDocumentView> docView = do_QueryInterface(nodeDoc, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsIDOMAbstractView> absView;
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = docView->GetDefaultView(getter_AddRefs(absView));
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsIDOMWindow> window = do_QueryInterface(absView, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  *aDOMWindow = window;
+  NS_IF_ADDREF(*aDOMWindow);
+  return rv;
+}
+
+NS_IMETHODIMP
+nsWidgetUtils::MouseMove(nsIDOMEvent* aDOMEvent)
+{
+  nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aDOMEvent);
+  if (!mouseEvent)
+    return NS_OK;
+  int x, y;
+  ((nsIDOMMouseEvent*)mouseEvent)->GetScreenX(&x);
+  ((nsIDOMMouseEvent*)mouseEvent)->GetScreenY(&y);
+
+  int dx = g_lastX - x;
+  int dy = g_lastY - y;
+  if(g_lastX == MIN_INT || g_lastY == MIN_INT)
+    return NS_OK;
+
+  nsCOMPtr<nsIDOMNode> eventNode;
+  nsCOMPtr<nsIDOMEventTarget> eventTarget;
+  aDOMEvent->GetTarget(getter_AddRefs(eventTarget));
+  if (!eventTarget)
+    return NS_OK;
+  eventNode = do_QueryInterface(eventTarget);
+  if (!eventNode)
+    return NS_OK;
+  nsCOMPtr<nsIDOMWindow> domWindow;
+  GetDOMWindowByNode(eventNode, getter_AddRefs(domWindow));
+  if (!domWindow)
+    return NS_OK;
+  nsCOMPtr<nsIDocument> doc;
+  nsCOMPtr<nsIDOMDocument> domDoc;
+  domWindow->GetDocument(getter_AddRefs(domDoc));
+  doc = do_QueryInterface(domDoc);
+  if (!doc) return NS_OK;
+  // the only case where there could be more shells in printpreview
+  nsIPresShell *shell = doc->GetPrimaryShell();
+  NS_ENSURE_TRUE(shell, NS_ERROR_FAILURE);
+  nsIViewManager* viewManager = shell->GetViewManager();
+  NS_ENSURE_TRUE(viewManager, NS_ERROR_FAILURE);
+  nsIView* rootView = nsnull;
+  viewManager->GetRootView(rootView);
+  NS_ENSURE_TRUE(rootView, NS_ERROR_FAILURE);
+  nsEventStatus statusX;
+  nsMouseScrollEvent scrollEventX(PR_TRUE, NS_MOUSE_SCROLL, rootView->GetWidget());
+  scrollEventX.delta = dx;
+  scrollEventX.scrollFlags = nsMouseScrollEvent::kIsHorizontal | nsMouseScrollEvent::kIsPixels;
+  viewManager->DispatchEvent(&scrollEventX, &statusX);
+  if(statusX != nsEventStatus_eIgnore ){
+    g_lastX = x;
+  }
+
+  nsEventStatus statusY;
+  nsMouseScrollEvent scrollEventY(PR_TRUE, NS_MOUSE_SCROLL, rootView->GetWidget());
+  scrollEventY.delta = dy;
+  scrollEventY.scrollFlags = nsMouseScrollEvent::kIsVertical | nsMouseScrollEvent::kIsPixels;
+  viewManager->DispatchEvent(&scrollEventY, &statusY);
+  if(statusY != nsEventStatus_eIgnore ){
+    g_lastY = y;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsWidgetUtils::DragMove(nsIDOMEvent* aDOMEvent)
+{
+  return NS_OK;
+}
+
+void
+nsWidgetUtils::GetChromeEventHandler(nsIDOMWindow *aDOMWin,
+                                 nsIDOMEventTarget **aChromeTarget)
+{
+    nsCOMPtr<nsPIDOMWindow> privateDOMWindow(do_QueryInterface(aDOMWin));
+    nsPIDOMEventTarget* chromeEventHandler = nsnull;
+    if (privateDOMWindow) {
+        chromeEventHandler = privateDOMWindow->GetChromeEventHandler();
+    }
+
+    nsCOMPtr<nsIDOMEventTarget> target(do_QueryInterface(chromeEventHandler));
+
+    *aChromeTarget = target;
+    NS_IF_ADDREF(*aChromeTarget);
+}
+
+void
+nsWidgetUtils::RemoveWindowListeners(nsIDOMWindow *aDOMWin)
+{
+    nsresult rv;
+    nsCOMPtr<nsIDOMEventTarget> chromeEventHandler;
+    GetChromeEventHandler(aDOMWin, getter_AddRefs(chromeEventHandler));
+    if (!chromeEventHandler) {
+        return;
+    }
+
+    // Use capturing, otherwise the normal find next will get activated when ours should
+    nsCOMPtr<nsPIDOMEventTarget> piTarget(do_QueryInterface(chromeEventHandler));
+
+    // Remove DOM Text listener for IME text events
+    rv = piTarget->RemoveEventListenerByIID(static_cast<nsIDOMMouseListener*>(this),
+                                            NS_GET_IID(nsIDOMMouseListener));
+    if (NS_FAILED(rv)) {
+        NS_WARNING("Failed to add Mouse Motion listener\n");
+        return;
+    }
+    rv = piTarget->RemoveEventListenerByIID(static_cast<nsIDOMMouseMotionListener*>(this),
+                                            NS_GET_IID(nsIDOMMouseMotionListener));
+    if (NS_FAILED(rv)) {
+        NS_WARNING("Failed to add Mouse Motion listener\n");
+        return;
+    }
+}
+
+void
+nsWidgetUtils::AttachWindowListeners(nsIDOMWindow *aDOMWin)
+{
+    nsresult rv;
+    nsCOMPtr<nsIDOMEventTarget> chromeEventHandler;
+    GetChromeEventHandler(aDOMWin, getter_AddRefs(chromeEventHandler));
+    if (!chromeEventHandler) {
+        return;
+    }
+
+    // Use capturing, otherwise the normal find next will get activated when ours should
+    nsCOMPtr<nsPIDOMEventTarget> piTarget(do_QueryInterface(chromeEventHandler));
+
+    // Attach menu listeners, this will help us ignore keystrokes meant for menus
+    rv = piTarget->AddEventListenerByIID(static_cast<nsIDOMMouseListener*>(this),
+                                         NS_GET_IID(nsIDOMMouseListener));
+    if (NS_FAILED(rv)) {
+        NS_WARNING("Failed to add Mouse Motion listener\n");
+        return;
+    }
+    rv = piTarget->AddEventListenerByIID(static_cast<nsIDOMMouseMotionListener*>(this),
+                                         NS_GET_IID(nsIDOMMouseMotionListener));
+    if (NS_FAILED(rv)) {
+        NS_WARNING("Failed to add Mouse Motion listener\n");
+        return;
+    }
+}
+
+nsWidgetUtils::~nsWidgetUtils()
+{
+}
+
+NS_IMPL_ISUPPORTS4(nsWidgetUtils, nsIObserver, nsIDOMMouseMotionListener, nsIDOMMouseListener, nsISupportsWeakReference)
+
+NS_IMETHODIMP
+nsWidgetUtils::Observe(nsISupports *aSubject, const char *aTopic, const PRUnichar *aData)
+{
+  nsresult rv;
+  if (!strcmp(aTopic,"domwindowopened")) 
+  {
+    nsCOMPtr<nsIDOMWindow> chromeWindow = do_QueryInterface(aSubject);
+    if (chromeWindow)
+      AttachWindowListeners(chromeWindow);
+    return NS_OK;
+  }
+
+  if (!strcmp(aTopic,"domwindowclosed")) 
+  {
+    nsCOMPtr<nsIDOMWindow> chromeWindow = do_QueryInterface(aSubject);
+    RemoveWindowListeners(chromeWindow);
+    return NS_OK;
+  }
+
+  return NS_OK;
+}
+
+//------------------------------------------------------------------------------
+//  XPCOM REGISTRATION BELOW
+//------------------------------------------------------------------------------
+
+#define WidgetUtils_CID \
+{  0x0ced17b6, 0x96ed, 0x4030, \
+{0xa1, 0x34, 0x77, 0xcb, 0x66, 0x10, 0xa8, 0xf6} }
+
+#define WidgetUtils_ContractID "@mozilla.org/extensions/widgetutils;1"
+
+static NS_METHOD WidgetUtilsRegistration(nsIComponentManager *aCompMgr,
+                                         nsIFile *aPath,
+                                         const char *registryLocation,
+                                         const char *componentType,
+                                         const nsModuleComponentInfo *info)
+{
+    nsresult rv;
+
+    nsCOMPtr<nsIServiceManager> servman = do_QueryInterface((nsISupports*)aCompMgr, &rv);
+    if (NS_FAILED(rv))
+        return rv;
+
+    nsCOMPtr<nsICategoryManager> catman;
+    servman->GetServiceByContractID(NS_CATEGORYMANAGER_CONTRACTID,
+                                    NS_GET_IID(nsICategoryManager),
+                                    getter_AddRefs(catman));
+
+    if (NS_FAILED(rv))
+        return rv;
+
+    char* previous = nsnull;
+    rv = catman->AddCategoryEntry("app-startup",
+                                  "WidgetUtils",
+                                  WidgetUtils_ContractID,
+                                  PR_TRUE,
+                                  PR_TRUE,
+                                  &previous);
+    if (previous)
+        nsMemory::Free(previous);
+
+    return rv;
+}
+
+static NS_METHOD WidgetUtilsUnregistration(nsIComponentManager *aCompMgr,
+                                           nsIFile *aPath,
+                                           const char *registryLocation,
+                                           const nsModuleComponentInfo *info)
+{
+    nsresult rv;
+
+    nsCOMPtr<nsIServiceManager> servman = do_QueryInterface((nsISupports*)aCompMgr, &rv);
+    if (NS_FAILED(rv))
+        return rv;
+
+    nsCOMPtr<nsICategoryManager> catman;
+    servman->GetServiceByContractID(NS_CATEGORYMANAGER_CONTRACTID,
+                                    NS_GET_IID(nsICategoryManager),
+                                    getter_AddRefs(catman));
+
+    if (NS_FAILED(rv))
+        return rv;
+
+    rv = catman->DeleteCategoryEntry("app-startup",
+                                     "WidgetUtils",
+                                     PR_TRUE);
+
+    return rv;
+}
+
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsWidgetUtils)
+
+  static const nsModuleComponentInfo components[] =
+{
+  { "nsWidgetUtilsService",
+    WidgetUtils_CID,
+    WidgetUtils_ContractID,
+    nsWidgetUtilsConstructor,
+    WidgetUtilsRegistration,
+    WidgetUtilsUnregistration
+  }
+};
+
+NS_IMPL_NSGETMODULE(nsWidgetUtilsModule, components)