extensions/widgetutils/src/nsWidgetUtils.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim:set ts=2 sw=2 sts=2 tw=80 et cindent: */
   3 /* ***** BEGIN LICENSE BLOCK *****
   4  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   5  *
   6  * The contents of this file are subject to the Mozilla Public License Version
   7  * 1.1 (the "License"); you may not use this file except in compliance with
   8  * the License. You may obtain a copy of the License at
   9  * http://www.mozilla.org/MPL/
  10  *
  11  * Software distributed under the License is distributed on an "AS IS" basis,
  12  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  13  * for the specific language governing rights and limitations under the
  14  * License.
  15  *
  16  * The Original Code is Mozilla's Element Optimizeing extension.
  17  *
  18  * The Initial Developer of the Original Code is the Mozilla Foundation.
  19  * Portions created by the Initial Developer are Copyright (C) 2006
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *   Oleg Romashin <romaxa@gmail.com> (original author)
  24  *   Brad Lassey <blassey@mozilla.com>
  25  *
  26  * Alternatively, the contents of this file may be used under the terms of
  27  * either the GNU General Public License Version 2 or later (the "GPL"), or
  28  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  29  * in which case the provisions of the GPL or the LGPL are applicable instead
  30  * of those above. If you wish to allow use of your version of this file only
  31  * under the terms of either the GPL or the LGPL, and not to allow others to
  32  * use your version of this file under the terms of the MPL, indicate your
  33  * decision by deleting the provisions above and replace them with the notice
  34  * and other provisions required by the GPL or the LGPL. If you do not delete
  35  * the provisions above, a recipient may use your version of this file under
  36  * the terms of any one of the MPL, the GPL or the LGPL.
  37  *
  38  * ***** END LICENSE BLOCK ***** */
  39
  40 #include "nsCURILoader.h"
  41 #include "nsICategoryManager.h"
  42 #include "nsIDOMAbstractView.h"
  43 #include "nsIDOMDocument.h"
  44 #include "nsIDOMDocumentView.h"
  45 #include "nsIDOMHTMLElement.h"
  46 #include "nsIDOMHTMLIFrameElement.h"
  47 #include "nsIDOMNSDocument.h"
  48 #include "nsIDOMNSElement.h"
  49 #include "nsIDOMNSHTMLElement.h"
  50 #include "nsIDOMNode.h"
  51 #include "nsIDOMNodeList.h"
  52 #include "nsIDOMWindow.h"
  53 #include "nsIDOMWindowCollection.h"
  54 #include "nsIDocument.h"
  55 #include "nsIGenericFactory.h"
  56 #include "nsIObserver.h"
  57 #include "nsIPref.h"
  58 #include "nsIPresShell.h"
  59 #include "nsIStyleSheetService.h"
  60 #include "nsIWebProgress.h"
  61 #include "nsIWebProgressListener.h"
  62 #include "nsIWindowWatcher.h"
  63 #include "nsNetUtil.h"
  64 #include "nsRect.h"
  65 #include "nsStringGlue.h"
  66 #include "nsWeakReference.h"
  67 #include "nsIWebBrowser.h"
  68 #include "nsIObserverService.h"
  69 #include "nsIDOMEventTarget.h"
  70 #include "nsPIDOMWindow.h"
  71 #include "nsIDOMWindow.h"
  72 //#include ".h"
  73 #include "nsIDOM3EventTarget.h"
  74 #include "nsIDOMKeyListener.h"
  75 #include "nsIDOMCompositionListener.h"
  76 #include "nsIDOMTextListener.h"
  77 #include "nsIDOMMouseMotionListener.h"
  78 #include "nsIDOMMouseListener.h"
  79 #include "nsIDOMMouseEvent.h"
  80 #include "nsIDOMNSEvent.h"
  81 #include "nsIView.h"
  82 #include "nsGUIEvent.h"
  83 #include "nsIViewManager.h"
  84 #include "nsIContentPolicy.h"
  85 #include "nsIDocShellTreeItem.h"
  86 #include "nsIContent.h"
  87 #include "nsITimer.h"
  88
  89 const int MIN_INT =((int) (1 << (sizeof(int) * 8 - 1)));
  90
  91 static int g_lastX=MIN_INT;
  92 static int g_lastY=MIN_INT;
  93 static PRInt32 g_panning = 0;
  94 static PRBool g_is_scrollable = PR_FALSE;
  95
  96 #define EM_MULT 16.
  97 #define NS_FRAME_HAS_RELATIVE_SIZE 0x01000000
  98 #define NS_FRAME_HAS_OPTIMIZEDVIEW 0x02000000
  99 #define BEHAVIOR_ACCEPT nsIPermissionManager::ALLOW_ACTION
 100 #define BEHAVIOR_REJECT nsIPermissionManager::DENY_ACTION
 101 #define BEHAVIOR_NOFOREIGN 3
 102 #define NUMBER_OF_TYPES 13
 103
 104 // TODO auto reload nsWidgetUtils in C.
 105 class nsWidgetUtils : public nsIObserver,
 106                       public nsIDOMMouseMotionListener,
 107                       public nsIDOMMouseListener,
 108                       public nsIContentPolicy,
 109                       public nsSupportsWeakReference
 110 {
 111 public:
 112   nsWidgetUtils();
 113   virtual ~nsWidgetUtils();
 114
 115   // nsIDOMMouseMotionListener
 116   NS_IMETHOD MouseMove(nsIDOMEvent* aDOMEvent);
 117   NS_IMETHOD DragMove(nsIDOMEvent* aMouseEvent);
 118   NS_IMETHOD HandleEvent(nsIDOMEvent* aDOMEvent);
 119
 120   // nsIDOMMouseListener
 121   NS_IMETHOD MouseDown(nsIDOMEvent* aDOMEvent);
 122   NS_IMETHOD MouseUp(nsIDOMEvent* aDOMEvent);
 123   NS_IMETHOD MouseClick(nsIDOMEvent* aDOMEvent);
 124   NS_IMETHOD MouseDblClick(nsIDOMEvent* aDOMEvent);
 125   NS_IMETHOD MouseOver(nsIDOMEvent* aDOMEvent);
 126   NS_IMETHOD MouseOut(nsIDOMEvent* aDOMEvent);
 127
 128   NS_DECL_ISUPPORTS
 129   NS_DECL_NSIOBSERVER
 130   NS_DECL_NSICONTENTPOLICY
 131
 132 private:
 133   nsresult Init(void);
 134   void RemoveWindowListeners(nsIDOMWindow *aDOMWin);
 135   void GetChromeEventHandler(nsIDOMWindow *aDOMWin, nsIDOMEventTarget **aChromeTarget);
 136   void AttachWindowListeners(nsIDOMWindow *aDOMWin);
 137   PRBool IsXULNode(nsIDOMNode *aNode, PRUint32 *aType = 0);
 138   nsresult GetDOMWindowByNode(nsIDOMNode *aNode, nsIDOMWindow * *aDOMWindow);
 139   nsresult UpdateFromEvent(nsIDOMEvent *aDOMEvent, nsIWidget * *aWidget = nsnull, nsIViewManager * *aViewManager = nsnull);
 140
 141   static void StopPanningCallback(nsITimer *timer, void *closure);
 142
 143   nsCOMPtr<nsIWidget> mWidget;
 144   nsCOMPtr<nsIViewManager> mViewManager;
 145   nsCOMPtr<nsITimer> mTimer;
 146 };
 147
 148 nsWidgetUtils::nsWidgetUtils()
 149 {
 150   Init();
 151 }
 152
 153 NS_IMETHODIMP
 154 nsWidgetUtils::Init()
 155 {
 156   nsresult rv;
 157   nsCOMPtr<nsIObserverService> obsSvc =
 158     do_GetService("@mozilla.org/observer-service;1");
 159   NS_ENSURE_STATE(obsSvc);
 160
 161   rv = obsSvc->AddObserver(this, "domwindowopened", PR_FALSE);
 162   NS_ENSURE_SUCCESS(rv, rv);
 163   rv = obsSvc->AddObserver(this, "domwindowclosed", PR_FALSE);
 164   NS_ENSURE_SUCCESS(rv, rv);
 165   mTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
 166 }
 167
 168 nsresult
 169 nsWidgetUtils::UpdateFromEvent(nsIDOMEvent *aDOMEvent, nsIWidget * *aWidget, nsIViewManager * *aViewManager)
 170 {
 171   nsCOMPtr <nsIDOMMouseEvent> mouseEvent;
 172   mouseEvent = do_QueryInterface(aDOMEvent);
 173   if (!mouseEvent)
 174     return NS_OK;
 175
 176   ((nsIDOMMouseEvent*)mouseEvent)->GetScreenX(&g_lastX);
 177   ((nsIDOMMouseEvent*)mouseEvent)->GetScreenY(&g_lastY);
 178
 179   nsCOMPtr<nsIDOMWindow> mWindow;
 180   nsCOMPtr<nsIDOMNode> mNode;
 181   nsCOMPtr<nsIDOMNode> mOrigNode;
 182
 183   PRUint32 type = 0;
 184   PRBool isXul = PR_FALSE;
 185   {
 186     nsCOMPtr <nsIDOMNSEvent> aEvent = do_QueryInterface(aDOMEvent);
 187     nsCOMPtr<nsIDOMEventTarget> eventOrigTarget;
 188     if (aEvent)
 189       aEvent->GetOriginalTarget(getter_AddRefs(eventOrigTarget));
 190     if (eventOrigTarget)
 191       mOrigNode = do_QueryInterface(eventOrigTarget);
 192     isXul = IsXULNode(mOrigNode, &type);
 193
 194   }
 195   if (isXul)
 196     return NS_ERROR_FAILURE;
 197
 198   nsCOMPtr<nsIDOMEventTarget> eventTarget;
 199   aDOMEvent->GetTarget(getter_AddRefs(eventTarget));
 200   if (eventTarget)
 201     mNode = do_QueryInterface(eventTarget);
 202
 203   if (!mNode)
 204     return NS_OK;
 205
 206   GetDOMWindowByNode(mNode, getter_AddRefs(mWindow));
 207   if (!mWindow)
 208     return NS_OK;
 209   nsCOMPtr<nsIDocument> doc;
 210   nsCOMPtr<nsIDOMDocument> domDoc;
 211   mWindow->GetDocument(getter_AddRefs(domDoc));
 212   doc = do_QueryInterface(domDoc);
 213   if (!doc) return NS_OK;
 214   // the only case where there could be more shells in printpreview
 215   nsIPresShell *shell = doc->GetPrimaryShell();
 216   NS_ENSURE_TRUE(shell, NS_ERROR_FAILURE);
 217   mViewManager = shell->GetViewManager();
 218   NS_ENSURE_TRUE(mViewManager, NS_ERROR_FAILURE);
 219   mViewManager->GetWidget(getter_AddRefs(mWidget));
 220   NS_ENSURE_TRUE(mWidget, NS_ERROR_FAILURE);
 221   if (aWidget)
 222     NS_ADDREF(*aWidget = mWidget);
 223   if (aViewManager)
 224     NS_ADDREF(*aViewManager = mViewManager);
 225   return NS_OK;
 226 }
 227
 228 NS_IMETHODIMP
 229 nsWidgetUtils::MouseDown(nsIDOMEvent* aDOMEvent)
 230 {
 231   g_is_scrollable = PR_FALSE;
 232   // Return TRUE from your signal handler to mark the event as consumed.
 233   if (NS_FAILED(UpdateFromEvent(aDOMEvent)))
 234     return NS_OK;
 235   g_is_scrollable = PR_TRUE;
 236   if (g_is_scrollable) {
 237      aDOMEvent->StopPropagation();
 238      aDOMEvent->PreventDefault();
 239   }
 240   return NS_OK;
 241 }
 242
 243 /* static */ void
 244 nsWidgetUtils::StopPanningCallback(nsITimer *timer, void *closure)
 245 {
 246   g_panning = PR_FALSE;
 247 }
 248
 249 NS_IMETHODIMP
 250 nsWidgetUtils::MouseUp(nsIDOMEvent* aDOMEvent)
 251 {
 252   nsCOMPtr <nsIDOMMouseEvent> mouseEvent;
 253   mouseEvent = do_QueryInterface(aDOMEvent);
 254   if (!mouseEvent)
 255     return NS_OK;
 256   // Return TRUE from your signal handler to mark the event as consumed.
 257   g_lastX = MIN_INT;
 258   g_lastY = MIN_INT;
 259   g_is_scrollable = PR_FALSE;
 260   if (g_panning) {
 261      aDOMEvent->StopPropagation();
 262      aDOMEvent->PreventDefault();
 263      nsresult rv;
 264      if (mTimer) {
 265        rv = mTimer->InitWithFuncCallback(nsWidgetUtils::StopPanningCallback,
 266                                         nsnull, 500, nsITimer::TYPE_ONE_SHOT);
 267        if (NS_SUCCEEDED(rv))
 268          return NS_OK;
 269      }
 270      g_panning = PR_FALSE;
 271   }
 272   return NS_OK;
 273 }
 274
 275 NS_IMETHODIMP
 276 nsWidgetUtils::MouseMove(nsIDOMEvent* aDOMEvent)
 277 {
 278   if (!g_is_scrollable) return NS_OK;
 279
 280   nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aDOMEvent);
 281   if (!mouseEvent)
 282     return NS_OK;
 283   int x, y;
 284   ((nsIDOMMouseEvent*)mouseEvent)->GetScreenX(&x);
 285   ((nsIDOMMouseEvent*)mouseEvent)->GetScreenY(&y);
 286
 287   int dx = g_lastX - x;
 288   int dy = g_lastY - y;
 289   if(g_lastX == MIN_INT || g_lastY == MIN_INT)
 290     return NS_OK;
 291
 292   nsIView *aView = nsnull;
 293   mViewManager->GetRootView(aView);
 294   if (!aView)
 295     if (NS_FAILED(UpdateFromEvent(aDOMEvent)))
 296       return NS_OK;
 297
 298   nsEventStatus statusX;
 299   nsMouseScrollEvent scrollEventX(PR_TRUE, NS_MOUSE_SCROLL, mWidget);
 300   scrollEventX.delta = dx;
 301   scrollEventX.scrollFlags = nsMouseScrollEvent::kIsHorizontal | nsMouseScrollEvent::kIsPixels;
 302   mViewManager->DispatchEvent(&scrollEventX, &statusX);
 303   if(statusX != nsEventStatus_eIgnore ){
 304     if (dx > 5)
 305       g_panning = PR_TRUE;
 306     g_lastX = x;
 307   }
 308
 309   nsEventStatus statusY;
 310   nsMouseScrollEvent scrollEventY(PR_TRUE, NS_MOUSE_SCROLL, mWidget);
 311   scrollEventY.delta = dy;
 312   scrollEventY.scrollFlags = nsMouseScrollEvent::kIsVertical | nsMouseScrollEvent::kIsPixels;
 313   mViewManager->DispatchEvent(&scrollEventY, &statusY);
 314   if(statusY != nsEventStatus_eIgnore ){
 315     if (dy > 5)
 316       g_panning = PR_TRUE;
 317     g_lastY = y;
 318   }
 319   if (g_panning) {
 320      aDOMEvent->StopPropagation();
 321      aDOMEvent->PreventDefault();
 322   }
 323
 324   return NS_OK;
 325 }
 326
 327 // nsIContentPolicy Implementation
 328 NS_IMETHODIMP
 329 nsWidgetUtils::ShouldLoad(PRUint32          aContentType,
 330                           nsIURI           *aContentLocation,
 331                           nsIURI           *aRequestingLocation,
 332                           nsISupports      *aRequestingContext,
 333                           const nsACString &aMimeGuess,
 334                           nsISupports      *aExtra,
 335                           PRInt16          *aDecision)
 336 {
 337     *aDecision = nsIContentPolicy::ACCEPT;
 338     nsresult rv;
 339
 340     if (aContentType != nsIContentPolicy::TYPE_DOCUMENT)
 341         return NS_OK;
 342
 343     // we can't do anything without this
 344     if (!aContentLocation)
 345         return NS_OK;
 346
 347     nsCAutoString scheme;
 348     rv = aContentLocation->GetScheme(scheme);
 349     nsCAutoString lscheme;
 350     ToLowerCase(scheme, lscheme);
 351     if (!lscheme.EqualsLiteral("ftp") &&
 352         !lscheme.EqualsLiteral("http") &&
 353         !lscheme.EqualsLiteral("https"))
 354         return NS_OK;
 355     if (g_panning > 0)
 356       *aDecision = nsIContentPolicy::REJECT_REQUEST;
 357     return NS_OK;
 358 }
 359
 360 NS_IMETHODIMP
 361 nsWidgetUtils::MouseClick(nsIDOMEvent* aDOMEvent)
 362 {
 363   return NS_OK;
 364 }
 365
 366 NS_IMETHODIMP
 367 nsWidgetUtils::MouseDblClick(nsIDOMEvent* aDOMEvent)
 368 {
 369   return NS_OK;
 370 }
 371
 372 NS_IMETHODIMP
 373 nsWidgetUtils::HandleEvent(nsIDOMEvent* aDOMEvent)
 374 {
 375   return NS_OK;
 376 }
 377
 378 NS_IMETHODIMP
 379 nsWidgetUtils::MouseOver(nsIDOMEvent* aDOMEvent)
 380 {
 381   return NS_OK;
 382 }
 383
 384 NS_IMETHODIMP
 385 nsWidgetUtils::MouseOut(nsIDOMEvent* aDOMEvent)
 386 {
 387   return NS_OK;
 388 }
 389
 390
 391 NS_IMETHODIMP
 392 nsWidgetUtils::DragMove(nsIDOMEvent* aDOMEvent)
 393 {
 394   return NS_OK;
 395 }
 396
 397 NS_IMETHODIMP
 398 nsWidgetUtils::ShouldProcess(PRUint32          aContentType,
 399                              nsIURI           *aContentLocation,
 400                              nsIURI           *aRequestingLocation,
 401                              nsISupports      *aRequestingContext,
 402                              const nsACString &aMimeGuess,
 403                              nsISupports      *aExtra,
 404                              PRInt16          *aDecision)
 405 {
 406     *aDecision = nsIContentPolicy::ACCEPT;
 407     return NS_OK;
 408 }
 409
 410 PRBool
 411 nsWidgetUtils::IsXULNode(nsIDOMNode *aNode, PRUint32 *aType)
 412 {
 413   PRBool retval = PR_FALSE;
 414   if (!aNode) return retval;
 415
 416   nsString sorigNode;
 417   aNode->GetNodeName(sorigNode);
 418   if (sorigNode.EqualsLiteral("#document"))
 419     return retval;
 420   retval = StringBeginsWith(sorigNode, NS_LITERAL_STRING("xul:"));
 421
 422   if (!aType) return retval;
 423
 424   if (sorigNode.EqualsLiteral("xul:thumb")
 425       || sorigNode.EqualsLiteral("xul:vbox")
 426       || sorigNode.EqualsLiteral("xul:spacer"))
 427     *aType = PR_FALSE; // Magic
 428   else if (sorigNode.EqualsLiteral("xul:slider"))
 429     *aType = 2; // Magic
 430   else if (sorigNode.EqualsLiteral("xul:scrollbarbutton"))
 431     *aType = 3; // Magic
 432
 433   return retval;
 434 }
 435
 436 nsresult
 437 nsWidgetUtils::GetDOMWindowByNode(nsIDOMNode *aNode, nsIDOMWindow * *aDOMWindow)
 438 {
 439   nsresult rv;
 440   nsCOMPtr<nsIDOMDocument> nodeDoc;
 441   rv = aNode->GetOwnerDocument(getter_AddRefs(nodeDoc));
 442   NS_ENSURE_SUCCESS(rv, rv);
 443   nsCOMPtr<nsIDOMDocumentView> docView = do_QueryInterface(nodeDoc, &rv);
 444   NS_ENSURE_SUCCESS(rv, rv);
 445   nsCOMPtr<nsIDOMAbstractView> absView;
 446   NS_ENSURE_SUCCESS(rv, rv);
 447   rv = docView->GetDefaultView(getter_AddRefs(absView));
 448   NS_ENSURE_SUCCESS(rv, rv);
 449   nsCOMPtr<nsIDOMWindow> window = do_QueryInterface(absView, &rv);
 450   NS_ENSURE_SUCCESS(rv, rv);
 451   *aDOMWindow = window;
 452   NS_IF_ADDREF(*aDOMWindow);
 453   return rv;
 454 }
 455
 456 void
 457 nsWidgetUtils::GetChromeEventHandler(nsIDOMWindow *aDOMWin,
 458                                  nsIDOMEventTarget **aChromeTarget)
 459 {
 460     nsCOMPtr<nsPIDOMWindow> privateDOMWindow(do_QueryInterface(aDOMWin));
 461     nsPIDOMEventTarget* chromeEventHandler = nsnull;
 462     if (privateDOMWindow) {
 463         chromeEventHandler = privateDOMWindow->GetChromeEventHandler();
 464     }
 465
 466     nsCOMPtr<nsIDOMEventTarget> target(do_QueryInterface(chromeEventHandler));
 467
 468     *aChromeTarget = target;
 469     NS_IF_ADDREF(*aChromeTarget);
 470 }
 471
 472 void
 473 nsWidgetUtils::RemoveWindowListeners(nsIDOMWindow *aDOMWin)
 474 {
 475     nsresult rv;
 476     nsCOMPtr<nsIDOMEventTarget> chromeEventHandler;
 477     GetChromeEventHandler(aDOMWin, getter_AddRefs(chromeEventHandler));
 478     if (!chromeEventHandler) {
 479         return;
 480     }
 481
 482     // Use capturing, otherwise the normal find next will get activated when ours should
 483     nsCOMPtr<nsPIDOMEventTarget> piTarget(do_QueryInterface(chromeEventHandler));
 484
 485     // Remove DOM Text listener for IME text events
 486     rv = piTarget->RemoveEventListenerByIID(static_cast<nsIDOMMouseListener*>(this),
 487                                             NS_GET_IID(nsIDOMMouseListener));
 488     if (NS_FAILED(rv)) {
 489         NS_WARNING("Failed to add Mouse Motion listener\n");
 490         return;
 491     }
 492     rv = piTarget->RemoveEventListenerByIID(static_cast<nsIDOMMouseMotionListener*>(this),
 493                                             NS_GET_IID(nsIDOMMouseMotionListener));
 494     if (NS_FAILED(rv)) {
 495         NS_WARNING("Failed to add Mouse Motion listener\n");
 496         return;
 497     }
 498 }
 499
 500 void
 501 nsWidgetUtils::AttachWindowListeners(nsIDOMWindow *aDOMWin)
 502 {
 503     nsresult rv;
 504     nsCOMPtr<nsIDOMEventTarget> chromeEventHandler;
 505     GetChromeEventHandler(aDOMWin, getter_AddRefs(chromeEventHandler));
 506     if (!chromeEventHandler) {
 507         return;
 508     }
 509
 510     // Use capturing, otherwise the normal find next will get activated when ours should
 511     nsCOMPtr<nsPIDOMEventTarget> piTarget(do_QueryInterface(chromeEventHandler));
 512
 513     // Attach menu listeners, this will help us ignore keystrokes meant for menus
 514     rv = piTarget->AddEventListenerByIID(static_cast<nsIDOMMouseListener*>(this),
 515                                          NS_GET_IID(nsIDOMMouseListener));
 516     if (NS_FAILED(rv)) {
 517         NS_WARNING("Failed to add Mouse Motion listener\n");
 518         return;
 519     }
 520     rv = piTarget->AddEventListenerByIID(static_cast<nsIDOMMouseMotionListener*>(this),
 521                                          NS_GET_IID(nsIDOMMouseMotionListener));
 522     if (NS_FAILED(rv)) {
 523         NS_WARNING("Failed to add Mouse Motion listener\n");
 524         return;
 525     }
 526 }
 527
 528 nsWidgetUtils::~nsWidgetUtils()
 529 {
 530 }
 531
 532 NS_IMPL_ISUPPORTS5(nsWidgetUtils, nsIObserver, nsIDOMMouseMotionListener, nsIDOMMouseListener, nsIContentPolicy, nsISupportsWeakReference)
 533
 534 NS_IMETHODIMP
 535 nsWidgetUtils::Observe(nsISupports *aSubject, const char *aTopic, const PRUnichar *aData)
 536 {
 537   nsresult rv;
 538   if (!strcmp(aTopic,"domwindowopened"))
 539   {
 540     nsCOMPtr<nsIDOMWindow> chromeWindow = do_QueryInterface(aSubject);
 541     if (chromeWindow)
 542       AttachWindowListeners(chromeWindow);
 543     return NS_OK;
 544   }
 545
 546   if (!strcmp(aTopic,"domwindowclosed"))
 547   {
 548     nsCOMPtr<nsIDOMWindow> chromeWindow = do_QueryInterface(aSubject);
 549     RemoveWindowListeners(chromeWindow);
 550     return NS_OK;
 551   }
 552
 553   return NS_OK;
 554 }
 555
 556 //------------------------------------------------------------------------------
 557 //  XPCOM REGISTRATION BELOW
 558 //------------------------------------------------------------------------------
 559
 560 #define WidgetUtils_CID \
 561 {  0x0ced17b6, 0x96ed, 0x4030, \
 562 {0xa1, 0x34, 0x77, 0xcb, 0x66, 0x10, 0xa8, 0xf6} }
 563
 564 #define WidgetUtils_ContractID "@mozilla.org/extensions/widgetutils;1"
 565
 566 static NS_METHOD WidgetUtilsRegistration(nsIComponentManager *aCompMgr,
 567                                          nsIFile *aPath,
 568                                          const char *registryLocation,
 569                                          const char *componentType,
 570                                          const nsModuleComponentInfo *info)
 571 {
 572     nsresult rv;
 573
 574     nsCOMPtr<nsIServiceManager> servman = do_QueryInterface((nsISupports*)aCompMgr, &rv);
 575     if (NS_FAILED(rv))
 576         return rv;
 577
 578     nsCOMPtr<nsICategoryManager> catman;
 579     servman->GetServiceByContractID(NS_CATEGORYMANAGER_CONTRACTID,
 580                                     NS_GET_IID(nsICategoryManager),
 581                                     getter_AddRefs(catman));
 582
 583     if (NS_FAILED(rv))
 584         return rv;
 585
 586     char* previous = nsnull;
 587     rv = catman->AddCategoryEntry("app-startup",
 588                                   "WidgetUtils",
 589                                   WidgetUtils_ContractID,
 590                                   PR_TRUE,
 591                                   PR_TRUE,
 592                                   &previous);
 593     if (previous)
 594         nsMemory::Free(previous);
 595     rv = catman->AddCategoryEntry("content-policy",
 596                                   "WidgetUtils",
 597                                   WidgetUtils_ContractID,
 598                                   PR_TRUE,
 599                                   PR_TRUE,
 600                                   &previous);
 601     if (previous)
 602         nsMemory::Free(previous);
 603
 604     return rv;
 605 }
 606
 607 static NS_METHOD WidgetUtilsUnregistration(nsIComponentManager *aCompMgr,
 608                                            nsIFile *aPath,
 609                                            const char *registryLocation,
 610                                            const nsModuleComponentInfo *info)
 611 {
 612     nsresult rv;
 613
 614     nsCOMPtr<nsIServiceManager> servman = do_QueryInterface((nsISupports*)aCompMgr, &rv);
 615     if (NS_FAILED(rv))
 616         return rv;
 617
 618     nsCOMPtr<nsICategoryManager> catman;
 619     servman->GetServiceByContractID(NS_CATEGORYMANAGER_CONTRACTID,
 620                                     NS_GET_IID(nsICategoryManager),
 621                                     getter_AddRefs(catman));
 622
 623     if (NS_FAILED(rv))
 624         return rv;
 625
 626     rv = catman->DeleteCategoryEntry("app-startup",
 627                                      "WidgetUtils",
 628                                      PR_TRUE);
 629     rv = catman->DeleteCategoryEntry("content-policy",
 630                                      "WidgetUtils",
 631                                      PR_TRUE);
 632
 633     return rv;
 634 }
 635
 636 NS_GENERIC_FACTORY_CONSTRUCTOR(nsWidgetUtils)
 637
 638   static const nsModuleComponentInfo components[] =
 639 {
 640   { "nsWidgetUtilsService",
 641     WidgetUtils_CID,
 642     WidgetUtils_ContractID,
 643     nsWidgetUtilsConstructor,
 644     WidgetUtilsRegistration,
 645     WidgetUtilsUnregistration
 646   }
 647 };
 648
 649 NS_IMPL_NSGETMODULE(nsWidgetUtilsModule, components)