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comparison: dom/xbl/nsXBLWindowKeyHandler.cpp

dom/xbl/nsXBLWindowKeyHandler.cpp

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1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 #include "nsCOMPtr.h"
7 #include "nsXBLPrototypeHandler.h"
8 #include "nsXBLWindowKeyHandler.h"
9 #include "nsIContent.h"
10 #include "nsIAtom.h"
11 #include "nsIDOMKeyEvent.h"
12 #include "nsXBLService.h"
13 #include "nsIServiceManager.h"
14 #include "nsGkAtoms.h"
15 #include "nsXBLDocumentInfo.h"
16 #include "nsIDOMElement.h"
17 #include "nsFocusManager.h"
18 #include "nsIURI.h"
19 #include "nsNetUtil.h"
20 #include "nsContentUtils.h"
21 #include "nsXBLPrototypeBinding.h"
22 #include "nsPIDOMWindow.h"
23 #include "nsIDocShell.h"
24 #include "nsIPresShell.h"
25 #include "mozilla/EventStateManager.h"
26 #include "nsISelectionController.h"
27 #include "mozilla/Preferences.h"
28 #include "mozilla/TextEvents.h"
29 #include "mozilla/dom/Element.h"
30 #include "mozilla/dom/Event.h"
31 #include "nsIEditor.h"
32 #include "nsIHTMLEditor.h"
33 #include "nsIDOMDocument.h"
34
35 using namespace mozilla;
36 using namespace mozilla::dom;
37
38 class nsXBLSpecialDocInfo : public nsIObserver
39 {
40 public:
41 nsRefPtr<nsXBLDocumentInfo> mHTMLBindings;
42 nsRefPtr<nsXBLDocumentInfo> mUserHTMLBindings;
43
44 static const char sHTMLBindingStr[];
45 static const char sUserHTMLBindingStr[];
46
47 bool mInitialized;
48
49 public:
50 NS_DECL_ISUPPORTS
51 NS_DECL_NSIOBSERVER
52
53 void LoadDocInfo();
54 void GetAllHandlers(const char* aType,
55 nsXBLPrototypeHandler** handler,
56 nsXBLPrototypeHandler** userHandler);
57 void GetHandlers(nsXBLDocumentInfo* aInfo,
58 const nsACString& aRef,
59 nsXBLPrototypeHandler** aResult);
60
61 nsXBLSpecialDocInfo() : mInitialized(false) {}
62
63 virtual ~nsXBLSpecialDocInfo() {}
64
65 };
66
67 const char nsXBLSpecialDocInfo::sHTMLBindingStr[] =
68 "chrome://global/content/platformHTMLBindings.xml";
69
70 NS_IMPL_ISUPPORTS(nsXBLSpecialDocInfo, nsIObserver)
71
72 NS_IMETHODIMP
73 nsXBLSpecialDocInfo::Observe(nsISupports* aSubject,
74 const char* aTopic,
75 const char16_t* aData)
76 {
77 MOZ_ASSERT(!strcmp(aTopic, "xpcom-shutdown"), "wrong topic");
78
79 // On shutdown, clear our fields to avoid an extra cycle collection.
80 mHTMLBindings = nullptr;
81 mUserHTMLBindings = nullptr;
82 mInitialized = false;
83 nsContentUtils::UnregisterShutdownObserver(this);
84
85 return NS_OK;
86 }
87
88 void nsXBLSpecialDocInfo::LoadDocInfo()
89 {
90 if (mInitialized)
91 return;
92 mInitialized = true;
93 nsContentUtils::RegisterShutdownObserver(this);
94
95 nsXBLService* xblService = nsXBLService::GetInstance();
96 if (!xblService)
97 return;
98
99 // Obtain the platform doc info
100 nsCOMPtr<nsIURI> bindingURI;
101 NS_NewURI(getter_AddRefs(bindingURI), sHTMLBindingStr);
102 if (!bindingURI) {
103 return;
104 }
105 xblService->LoadBindingDocumentInfo(nullptr, nullptr,
106 bindingURI,
107 nullptr,
108 true,
109 getter_AddRefs(mHTMLBindings));
110
111 const nsAdoptingCString& userHTMLBindingStr =
112 Preferences::GetCString("dom.userHTMLBindings.uri");
113 if (!userHTMLBindingStr.IsEmpty()) {
114 NS_NewURI(getter_AddRefs(bindingURI), userHTMLBindingStr);
115 if (!bindingURI) {
116 return;
117 }
118
119 xblService->LoadBindingDocumentInfo(nullptr, nullptr,
120 bindingURI,
121 nullptr,
122 true,
123 getter_AddRefs(mUserHTMLBindings));
124 }
125 }
126
127 //
128 // GetHandlers
129 //
130 //
131 void
132 nsXBLSpecialDocInfo::GetHandlers(nsXBLDocumentInfo* aInfo,
133 const nsACString& aRef,
134 nsXBLPrototypeHandler** aResult)
135 {
136 nsXBLPrototypeBinding* binding = aInfo->GetPrototypeBinding(aRef);
137
138 NS_ASSERTION(binding, "No binding found for the XBL window key handler.");
139 if (!binding)
140 return;
141
142 *aResult = binding->GetPrototypeHandlers();
143 }
144
145 void
146 nsXBLSpecialDocInfo::GetAllHandlers(const char* aType,
147 nsXBLPrototypeHandler** aHandler,
148 nsXBLPrototypeHandler** aUserHandler)
149 {
150 if (mUserHTMLBindings) {
151 nsAutoCString type(aType);
152 type.Append("User");
153 GetHandlers(mUserHTMLBindings, type, aUserHandler);
154 }
155 if (mHTMLBindings) {
156 GetHandlers(mHTMLBindings, nsDependentCString(aType), aHandler);
157 }
158 }
159
160 // Init statics
161 nsXBLSpecialDocInfo* nsXBLWindowKeyHandler::sXBLSpecialDocInfo = nullptr;
162 uint32_t nsXBLWindowKeyHandler::sRefCnt = 0;
163
164 nsXBLWindowKeyHandler::nsXBLWindowKeyHandler(nsIDOMElement* aElement,
165 EventTarget* aTarget)
166 : mTarget(aTarget),
167 mHandler(nullptr),
168 mUserHandler(nullptr)
169 {
170 mWeakPtrForElement = do_GetWeakReference(aElement);
171 ++sRefCnt;
172 }
173
174 nsXBLWindowKeyHandler::~nsXBLWindowKeyHandler()
175 {
176 // If mWeakPtrForElement is non-null, we created a prototype handler.
177 if (mWeakPtrForElement)
178 delete mHandler;
179
180 --sRefCnt;
181 if (!sRefCnt) {
182 NS_IF_RELEASE(sXBLSpecialDocInfo);
183 }
184 }
185
186 NS_IMPL_ISUPPORTS(nsXBLWindowKeyHandler,
187 nsIDOMEventListener)
188
189 static void
190 BuildHandlerChain(nsIContent* aContent, nsXBLPrototypeHandler** aResult)
191 {
192 *aResult = nullptr;
193
194 // Since we chain each handler onto the next handler,
195 // we'll enumerate them here in reverse so that when we
196 // walk the chain they'll come out in the original order
197 for (nsIContent* key = aContent->GetLastChild();
198 key;
199 key = key->GetPreviousSibling()) {
200
201 if (key->NodeInfo()->Equals(nsGkAtoms::key, kNameSpaceID_XUL)) {
202 // Check whether the key element has empty value at key/char attribute.
203 // Such element is used by localizers for alternative shortcut key
204 // definition on the locale. See bug 426501.
205 nsAutoString valKey, valCharCode, valKeyCode;
206 bool attrExists =
207 key->GetAttr(kNameSpaceID_None, nsGkAtoms::key, valKey) ||
208 key->GetAttr(kNameSpaceID_None, nsGkAtoms::charcode, valCharCode) ||
209 key->GetAttr(kNameSpaceID_None, nsGkAtoms::keycode, valKeyCode);
210 if (attrExists &&
211 valKey.IsEmpty() && valCharCode.IsEmpty() && valKeyCode.IsEmpty())
212 continue;
213
214 nsXBLPrototypeHandler* handler = new nsXBLPrototypeHandler(key);
215
216 if (!handler)
217 return;
218
219 handler->SetNextHandler(*aResult);
220 *aResult = handler;
221 }
222 }
223 }
224
225 //
226 // EnsureHandlers
227 //
228 // Lazily load the XBL handlers. Overridden to handle being attached
229 // to a particular element rather than the document
230 //
231 nsresult
232 nsXBLWindowKeyHandler::EnsureHandlers()
233 {
234 nsCOMPtr<Element> el = GetElement();
235 NS_ENSURE_STATE(!mWeakPtrForElement || el);
236 if (el) {
237 // We are actually a XUL <keyset>.
238 if (mHandler)
239 return NS_OK;
240
241 nsCOMPtr<nsIContent> content(do_QueryInterface(el));
242 BuildHandlerChain(content, &mHandler);
243 } else { // We are an XBL file of handlers.
244 if (!sXBLSpecialDocInfo) {
245 sXBLSpecialDocInfo = new nsXBLSpecialDocInfo();
246 NS_ADDREF(sXBLSpecialDocInfo);
247 }
248 sXBLSpecialDocInfo->LoadDocInfo();
249
250 // Now determine which handlers we should be using.
251 if (IsHTMLEditableFieldFocused()) {
252 sXBLSpecialDocInfo->GetAllHandlers("editor", &mHandler, &mUserHandler);
253 }
254 else {
255 sXBLSpecialDocInfo->GetAllHandlers("browser", &mHandler, &mUserHandler);
256 }
257 }
258
259 return NS_OK;
260 }
261
262 nsresult
263 nsXBLWindowKeyHandler::WalkHandlers(nsIDOMKeyEvent* aKeyEvent, nsIAtom* aEventType)
264 {
265 bool prevent;
266 aKeyEvent->GetDefaultPrevented(&prevent);
267 if (prevent)
268 return NS_OK;
269
270 bool trustedEvent = false;
271 // Don't process the event if it was not dispatched from a trusted source
272 aKeyEvent->GetIsTrusted(&trustedEvent);
273
274 if (!trustedEvent)
275 return NS_OK;
276
277 nsresult rv = EnsureHandlers();
278 NS_ENSURE_SUCCESS(rv, rv);
279
280 bool isDisabled;
281 nsCOMPtr<Element> el = GetElement(&isDisabled);
282 if (!el) {
283 if (mUserHandler) {
284 WalkHandlersInternal(aKeyEvent, aEventType, mUserHandler, true);
285 aKeyEvent->GetDefaultPrevented(&prevent);
286 if (prevent)
287 return NS_OK; // Handled by the user bindings. Our work here is done.
288 }
289 }
290
291 // skip keysets that are disabled
292 if (el && isDisabled) {
293 return NS_OK;
294 }
295
296 WalkHandlersInternal(aKeyEvent, aEventType, mHandler, true);
297
298 return NS_OK;
299 }
300
301 NS_IMETHODIMP
302 nsXBLWindowKeyHandler::HandleEvent(nsIDOMEvent* aEvent)
303 {
304 nsCOMPtr<nsIDOMKeyEvent> keyEvent(do_QueryInterface(aEvent));
305 NS_ENSURE_TRUE(keyEvent, NS_ERROR_INVALID_ARG);
306
307 uint16_t eventPhase;
308 aEvent->GetEventPhase(&eventPhase);
309 if (eventPhase == nsIDOMEvent::CAPTURING_PHASE) {
310 HandleEventOnCapture(keyEvent);
311 return NS_OK;
312 }
313
314 nsAutoString eventType;
315 aEvent->GetType(eventType);
316 nsCOMPtr<nsIAtom> eventTypeAtom = do_GetAtom(eventType);
317 NS_ENSURE_TRUE(eventTypeAtom, NS_ERROR_OUT_OF_MEMORY);
318
319 return WalkHandlers(keyEvent, eventTypeAtom);
320 }
321
322 void
323 nsXBLWindowKeyHandler::HandleEventOnCapture(nsIDOMKeyEvent* aEvent)
324 {
325 WidgetKeyboardEvent* widgetEvent =
326 aEvent->GetInternalNSEvent()->AsKeyboardEvent();
327
328 if (widgetEvent->mFlags.mNoCrossProcessBoundaryForwarding) {
329 return;
330 }
331
332 nsCOMPtr<mozilla::dom::Element> originalTarget =
333 do_QueryInterface(aEvent->GetInternalNSEvent()->originalTarget);
334 if (!EventStateManager::IsRemoteTarget(originalTarget)) {
335 return;
336 }
337
338 if (!HasHandlerForEvent(aEvent)) {
339 return;
340 }
341
342 // If this event hasn't been marked as mNoCrossProcessBoundaryForwarding
343 // yet, it means it wasn't processed by content. We'll not call any
344 // of the handlers at this moment, and will wait for the event to be
345 // redispatched with mNoCrossProcessBoundaryForwarding = 1 to process it.
346
347 // Inform the child process that this is a event that we want a reply
348 // from.
349 widgetEvent->mFlags.mWantReplyFromContentProcess = 1;
350 aEvent->StopPropagation();
351 }
352
353 //
354 // EventMatched
355 //
356 // See if the given handler cares about this particular key event
357 //
358 bool
359 nsXBLWindowKeyHandler::EventMatched(nsXBLPrototypeHandler* inHandler,
360 nsIAtom* inEventType,
361 nsIDOMKeyEvent* inEvent,
362 uint32_t aCharCode, bool aIgnoreShiftKey)
363 {
364 return inHandler->KeyEventMatched(inEventType, inEvent, aCharCode,
365 aIgnoreShiftKey);
366 }
367
368 bool
369 nsXBLWindowKeyHandler::IsHTMLEditableFieldFocused()
370 {
371 nsIFocusManager* fm = nsFocusManager::GetFocusManager();
372 if (!fm)
373 return false;
374
375 nsCOMPtr<nsIDOMWindow> focusedWindow;
376 fm->GetFocusedWindow(getter_AddRefs(focusedWindow));
377 if (!focusedWindow)
378 return false;
379
380 nsCOMPtr<nsPIDOMWindow> piwin(do_QueryInterface(focusedWindow));
381 nsIDocShell *docShell = piwin->GetDocShell();
382 if (!docShell) {
383 return false;
384 }
385
386 nsCOMPtr<nsIEditor> editor;
387 docShell->GetEditor(getter_AddRefs(editor));
388 nsCOMPtr<nsIHTMLEditor> htmlEditor = do_QueryInterface(editor);
389 if (!htmlEditor) {
390 return false;
391 }
392
393 nsCOMPtr<nsIDOMDocument> domDocument;
394 editor->GetDocument(getter_AddRefs(domDocument));
395 nsCOMPtr<nsIDocument> doc = do_QueryInterface(domDocument);
396 if (doc->HasFlag(NODE_IS_EDITABLE)) {
397 // Don't need to perform any checks in designMode documents.
398 return true;
399 }
400
401 nsCOMPtr<nsIDOMElement> focusedElement;
402 fm->GetFocusedElement(getter_AddRefs(focusedElement));
403 nsCOMPtr<nsINode> focusedNode = do_QueryInterface(focusedElement);
404 if (focusedNode) {
405 // If there is a focused element, make sure it's in the active editing host.
406 // Note that GetActiveEditingHost finds the current editing host based on
407 // the document's selection. Even though the document selection is usually
408 // collapsed to where the focus is, but the page may modify the selection
409 // without our knowledge, in which case this check will do something useful.
410 nsCOMPtr<Element> activeEditingHost = htmlEditor->GetActiveEditingHost();
411 if (!activeEditingHost) {
412 return false;
413 }
414 return nsContentUtils::ContentIsDescendantOf(focusedNode, activeEditingHost);
415 }
416
417 return false;
418 }
419
420 //
421 // WalkHandlersInternal and WalkHandlersAndExecute
422 //
423 // Given a particular DOM event and a pointer to the first handler in the list,
424 // scan through the list to find something to handle the event. If aExecute = true,
425 // the handler will be executed; otherwise just return an answer telling if a handler
426 // for that event was found.
427 //
428 bool
429 nsXBLWindowKeyHandler::WalkHandlersInternal(nsIDOMKeyEvent* aKeyEvent,
430 nsIAtom* aEventType,
431 nsXBLPrototypeHandler* aHandler,
432 bool aExecute)
433 {
434 nsAutoTArray<nsShortcutCandidate, 10> accessKeys;
435 nsContentUtils::GetAccelKeyCandidates(aKeyEvent, accessKeys);
436
437 if (accessKeys.IsEmpty()) {
438 return WalkHandlersAndExecute(aKeyEvent, aEventType, aHandler,
439 0, false, aExecute);
440 }
441
442 for (uint32_t i = 0; i < accessKeys.Length(); ++i) {
443 nsShortcutCandidate &key = accessKeys[i];
444 if (WalkHandlersAndExecute(aKeyEvent, aEventType, aHandler,
445 key.mCharCode, key.mIgnoreShift, aExecute))
446 return true;
447 }
448 return false;
449 }
450
451 bool
452 nsXBLWindowKeyHandler::WalkHandlersAndExecute(nsIDOMKeyEvent* aKeyEvent,
453 nsIAtom* aEventType,
454 nsXBLPrototypeHandler* aHandler,
455 uint32_t aCharCode,
456 bool aIgnoreShiftKey,
457 bool aExecute)
458 {
459 nsresult rv;
460
461 // Try all of the handlers until we find one that matches the event.
462 for (nsXBLPrototypeHandler *currHandler = aHandler; currHandler;
463 currHandler = currHandler->GetNextHandler()) {
464 bool stopped = aKeyEvent->IsDispatchStopped();
465 if (stopped) {
466 // The event is finished, don't execute any more handlers
467 return false;
468 }
469
470 if (!EventMatched(currHandler, aEventType, aKeyEvent,
471 aCharCode, aIgnoreShiftKey))
472 continue; // try the next one
473
474 // Before executing this handler, check that it's not disabled,
475 // and that it has something to do (oncommand of the <key> or its
476 // <command> is non-empty).
477 nsCOMPtr<nsIContent> elt = currHandler->GetHandlerElement();
478 nsCOMPtr<Element> commandElt;
479
480 // See if we're in a XUL doc.
481 nsCOMPtr<Element> el = GetElement();
482 if (el && elt) {
483 // We are. Obtain our command attribute.
484 nsAutoString command;
485 elt->GetAttr(kNameSpaceID_None, nsGkAtoms::command, command);
486 if (!command.IsEmpty()) {
487 // Locate the command element in question. Note that we
488 // know "elt" is in a doc if we're dealing with it here.
489 NS_ASSERTION(elt->IsInDoc(), "elt must be in document");
490 nsIDocument *doc = elt->GetCurrentDoc();
491 if (doc)
492 commandElt = do_QueryInterface(doc->GetElementById(command));
493
494 if (!commandElt) {
495 NS_ERROR("A XUL <key> is observing a command that doesn't exist. Unable to execute key binding!");
496 continue;
497 }
498 }
499 }
500
501 if (!commandElt) {
502 commandElt = do_QueryInterface(elt);
503 }
504
505 if (commandElt) {
506 nsAutoString value;
507 commandElt->GetAttribute(NS_LITERAL_STRING("disabled"), value);
508 if (value.EqualsLiteral("true")) {
509 continue; // this handler is disabled, try the next one
510 }
511
512 // Check that there is an oncommand handler
513 commandElt->GetAttribute(NS_LITERAL_STRING("oncommand"), value);
514 if (value.IsEmpty()) {
515 continue; // nothing to do
516 }
517 }
518
519 nsCOMPtr<EventTarget> piTarget;
520 nsCOMPtr<Element> element = GetElement();
521 if (element) {
522 piTarget = commandElt;
523 } else {
524 piTarget = mTarget;
525 }
526
527 if (!aExecute) {
528 return true;
529 }
530
531 rv = currHandler->ExecuteHandler(piTarget, aKeyEvent);
532 if (NS_SUCCEEDED(rv)) {
533 return true;
534 }
535 }
536
537 return false;
538 }
539
540 bool
541 nsXBLWindowKeyHandler::HasHandlerForEvent(nsIDOMKeyEvent* aEvent)
542 {
543 if (!aEvent->InternalDOMEvent()->IsTrusted()) {
544 return false;
545 }
546
547 nsresult rv = EnsureHandlers();
548 NS_ENSURE_SUCCESS(rv, false);
549
550 bool isDisabled;
551 nsCOMPtr<Element> el = GetElement(&isDisabled);
552 if (el && isDisabled) {
553 return false;
554 }
555
556 nsAutoString eventType;
557 aEvent->GetType(eventType);
558 nsCOMPtr<nsIAtom> eventTypeAtom = do_GetAtom(eventType);
559 NS_ENSURE_TRUE(eventTypeAtom, false);
560
561 return WalkHandlersInternal(aEvent, eventTypeAtom, mHandler, false);
562 }
563
564 already_AddRefed<Element>
565 nsXBLWindowKeyHandler::GetElement(bool* aIsDisabled)
566 {
567 nsCOMPtr<Element> element = do_QueryReferent(mWeakPtrForElement);
568 if (element && aIsDisabled) {
569 *aIsDisabled = element->AttrValueIs(kNameSpaceID_None, nsGkAtoms::disabled,
570 nsGkAtoms::_true, eCaseMatters);
571 }
572 return element.forget();
573 }
574
575 ///////////////////////////////////////////////////////////////////////////////////
576
577 already_AddRefed<nsXBLWindowKeyHandler>
578 NS_NewXBLWindowKeyHandler(nsIDOMElement* aElement, EventTarget* aTarget)
579 {
580 nsRefPtr<nsXBLWindowKeyHandler> result =
581 new nsXBLWindowKeyHandler(aElement, aTarget);
582 return result.forget();
583 }

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