DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (ca88b9fad7d5)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_dom_Event_h_
#define mozilla_dom_Event_h_

#include "mozilla/Attributes.h"
#include "mozilla/BasicEvents.h"
#include "nsIDOMEvent.h"
#include "nsISupports.h"
#include "nsCOMPtr.h"
#include "nsPIDOMWindow.h"
#include "nsPoint.h"
#include "nsCycleCollectionParticipant.h"
#include "mozilla/dom/BindingDeclarations.h"
#include "mozilla/dom/EventBinding.h"
#include "nsIScriptGlobalObject.h"
#include "Units.h"
#include "js/TypeDecls.h"
#include "nsIGlobalObject.h"

class nsIContent;
class nsIDOMEventTarget;
class nsPresContext;

namespace mozilla {
namespace dom {

class BeforeUnloadEvent;
class EventTarget;
class EventMessageAutoOverride;
// ExtendableEvent is a ServiceWorker event that is not
// autogenerated since it has some extra methods.
class ExtendableEvent;
class KeyboardEvent;
class TimeEvent;
class WantsPopupControlCheck;
#define GENERATED_EVENT(EventClass_) class EventClass_;
#include "mozilla/dom/GeneratedEventList.h"
#undef GENERATED_EVENT

// Dummy class so we can cast through it to get from nsISupports to
// Event subclasses with only two non-ambiguous static casts.
class EventBase : public nsIDOMEvent {};

class Event : public EventBase, public nsWrapperCache {
 public:
  Event(EventTarget* aOwner, nsPresContext* aPresContext, WidgetEvent* aEvent);
  explicit Event(nsPIDOMWindowInner* aWindow);

 protected:
  virtual ~Event();

 private:
  void ConstructorInit(EventTarget* aOwner, nsPresContext* aPresContext,
                       WidgetEvent* aEvent);

 public:
  static Event* FromSupports(nsISupports* aSupports) {
    nsIDOMEvent* event = static_cast<nsIDOMEvent*>(aSupports);
#ifdef DEBUG
    {
      nsCOMPtr<nsIDOMEvent> target_qi = do_QueryInterface(aSupports);

      // If this assertion fires the QI implementation for the object in
      // question doesn't use the nsIDOMEvent pointer as the
      // nsISupports pointer. That must be fixed, or we'll crash...
      MOZ_ASSERT(target_qi == event, "Uh, fix QI!");
    }
#endif
    return static_cast<Event*>(event);
  }

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(Event)

  nsIGlobalObject* GetParentObject() { return mOwner; }

  JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) final;

  virtual JSObject* WrapObjectInternal(JSContext* aCx,
                                       JS::Handle<JSObject*> aGivenProto);

#define GENERATED_EVENT(EventClass_) \
  virtual EventClass_* As##EventClass_() { return nullptr; }
#include "mozilla/dom/GeneratedEventList.h"
#undef GENERATED_EVENT

  // ExtendableEvent is a ServiceWorker event that is not
  // autogenerated since it has some extra methods.
  virtual ExtendableEvent* AsExtendableEvent() { return nullptr; }

  virtual TimeEvent* AsTimeEvent() { return nullptr; }

  // BeforeUnloadEvent is not autogenerated because it has a setter.
  virtual BeforeUnloadEvent* AsBeforeUnloadEvent() { return nullptr; }

  // KeyboardEvent has all sorts of non-autogeneratable bits so far.
  virtual KeyboardEvent* AsKeyboardEvent() { return nullptr; }

  // nsIDOMEvent Interface
  NS_DECL_NSIDOMEVENT

  void InitPresContextData(nsPresContext* aPresContext);

  // Returns true if the event should be trusted.
  bool Init(EventTarget* aGlobal);

  static PopupControlState GetEventPopupControlState(
      WidgetEvent* aEvent, nsIDOMEvent* aDOMEvent = nullptr);

  static void PopupAllowedEventsChanged();

  static void Shutdown();

  static const char* GetEventName(EventMessage aEventType);
  static CSSIntPoint GetClientCoords(nsPresContext* aPresContext,
                                     WidgetEvent* aEvent,
                                     LayoutDeviceIntPoint aPoint,
                                     CSSIntPoint aDefaultPoint);
  static CSSIntPoint GetPageCoords(nsPresContext* aPresContext,
                                   WidgetEvent* aEvent,
                                   LayoutDeviceIntPoint aPoint,
                                   CSSIntPoint aDefaultPoint);
  static CSSIntPoint GetScreenCoords(nsPresContext* aPresContext,
                                     WidgetEvent* aEvent,
                                     LayoutDeviceIntPoint aPoint);
  static CSSIntPoint GetOffsetCoords(nsPresContext* aPresContext,
                                     WidgetEvent* aEvent,
                                     LayoutDeviceIntPoint aPoint,
                                     CSSIntPoint aDefaultPoint);

  static already_AddRefed<Event> Constructor(EventTarget* aEventTarget,
                                             const nsAString& aType,
                                             const EventInit& aParam);

  static already_AddRefed<Event> Constructor(const GlobalObject& aGlobal,
                                             const nsAString& aType,
                                             const EventInit& aParam,
                                             ErrorResult& aRv);

  // Implemented as xpidl method
  // void GetType(nsString& aRetval) {}

  EventTarget* GetTarget() const;
  static bool IsSrcElementEnabled(JSContext* /* unused */,
                                  JSObject* /* unused */);
  EventTarget* GetCurrentTarget() const;

  void ComposedPath(nsTArray<RefPtr<EventTarget>>& aPath);

  uint16_t EventPhase() const;

  // xpidl implementation
  // void StopPropagation();

  // xpidl implementation
  // void StopImmediatePropagation();

  bool Bubbles() const { return mEvent->mFlags.mBubbles; }

  bool Cancelable() const { return mEvent->mFlags.mCancelable; }

  bool Composed() const { return mEvent->mFlags.mComposed; }

  bool CancelBubble() const { return mEvent->PropagationStopped(); }

  // xpidl implementation
  // void PreventDefault();

  // You MUST NOT call PreventDefault(JSContext*, CallerType) from C++ code.  A
  // call of this method always sets Event.defaultPrevented true for web
  // contents.  If default action handler calls this, web applications see wrong
  // defaultPrevented value.
  virtual void PreventDefault(JSContext* aCx, CallerType aCallerType);

  // You MUST NOT call DefaultPrevented(CallerType) from C++ code.  This may
  // return false even if PreventDefault() has been called.
  // See comments in its implementation for the details.
  bool DefaultPrevented(CallerType aCallerType) const;

  bool DefaultPrevented() const { return mEvent->DefaultPrevented(); }

  bool DefaultPreventedByChrome() const {
    return mEvent->mFlags.mDefaultPreventedByChrome;
  }

  bool DefaultPreventedByContent() const {
    return mEvent->mFlags.mDefaultPreventedByContent;
  }

  bool MultipleActionsPrevented() const {
    return mEvent->mFlags.mMultipleActionsPrevented;
  }

  bool IsTrusted() const { return mEvent->IsTrusted(); }

  bool IsSynthesized() const { return mEvent->mFlags.mIsSynthesizedForTests; }

  double TimeStamp();

  EventTarget* GetOriginalTarget() const;
  EventTarget* GetExplicitOriginalTarget() const;
  EventTarget* GetComposedTarget() const;

  /**
   * @param aCalledByDefaultHandler     Should be true when this is called by
   *                                    C++ or Chrome.  Otherwise, e.g., called
   *                                    by a call of Event.preventDefault() in
   *                                    content script, false.
   */
  void PreventDefaultInternal(bool aCalledByDefaultHandler,
                              nsIPrincipal* aPrincipal = nullptr);

  bool IsMainThreadEvent() { return mIsMainThreadEvent; }

  void MarkUninitialized() {
    mEvent->mMessage = eVoidEvent;
    mEvent->mSpecifiedEventTypeString.Truncate();
    mEvent->mSpecifiedEventType = nullptr;
  }

  /**
   * For WidgetEvent, return it's type in string.
   *
   * @param aEvent is a WidgetEvent to get its type.
   * @param aType is a string where to return the type.
   */
  static void GetWidgetEventType(WidgetEvent* aEvent, nsAString& aType);

 protected:
  // Internal helper functions
  void SetEventType(const nsAString& aEventTypeArg);
  already_AddRefed<nsIContent> GetTargetFromFrame();

  friend class EventMessageAutoOverride;
  friend class WantsPopupControlCheck;
  void SetWantsPopupControlCheck(bool aCheck) {
    mWantsPopupControlCheck = aCheck;
  }

  bool GetWantsPopupControlCheck() {
    return IsTrusted() && mWantsPopupControlCheck;
  }

  void SetComposed(bool aComposed) { mEvent->SetComposed(aComposed); }

  already_AddRefed<EventTarget> EnsureWebAccessibleRelatedTarget(
      EventTarget* aRelatedTarget);

  mozilla::WidgetEvent* mEvent;
  RefPtr<nsPresContext> mPresContext;
  nsCOMPtr<EventTarget> mExplicitOriginalTarget;
  nsCOMPtr<nsIGlobalObject> mOwner;
  bool mEventIsInternal;
  bool mPrivateDataDuplicated;
  bool mIsMainThreadEvent;
  // True when popup control check should rely on event.type, not
  // WidgetEvent.mMessage.
  bool mWantsPopupControlCheck;
};

/**
 * RAII helper-class to override an event's message (i.e. its DOM-exposed
 * type), for as long as the object is alive.  Restores the original
 * EventMessage when destructed.
 *
 * Notable requirements:
 *  - The original & overriding messages must be known (not eUnidentifiedEvent).
 *  - The original & overriding messages must be different.
 *  - The passed-in nsIDOMEvent must outlive this RAII helper.
 */
class MOZ_RAII EventMessageAutoOverride {
 public:
  explicit EventMessageAutoOverride(nsIDOMEvent* aEvent,
                                    EventMessage aOverridingMessage)
      : mEvent(aEvent->InternalDOMEvent()),
        mOrigMessage(mEvent->mEvent->mMessage) {
    MOZ_ASSERT(aOverridingMessage != mOrigMessage,
               "Don't use this class if you're not actually overriding");
    MOZ_ASSERT(aOverridingMessage != eUnidentifiedEvent,
               "Only use this class with a valid overriding EventMessage");
    MOZ_ASSERT(mOrigMessage != eUnidentifiedEvent &&
                   mEvent->mEvent->mSpecifiedEventTypeString.IsEmpty(),
               "Only use this class on events whose overridden type is "
               "known (so we can restore it properly)");

    mEvent->mEvent->mMessage = aOverridingMessage;
  }

  ~EventMessageAutoOverride() { mEvent->mEvent->mMessage = mOrigMessage; }

 protected:
  // Non-owning ref, which should be safe since we're a stack-allocated object
  // with limited lifetime. Whoever creates us should keep mEvent alive.
  Event* const MOZ_NON_OWNING_REF mEvent;
  const EventMessage mOrigMessage;
};

class MOZ_STACK_CLASS WantsPopupControlCheck {
 public:
  explicit WantsPopupControlCheck(nsIDOMEvent* aEvent)
      : mEvent(aEvent->InternalDOMEvent()) {
    mOriginalWantsPopupControlCheck = mEvent->GetWantsPopupControlCheck();
    mEvent->SetWantsPopupControlCheck(mEvent->IsTrusted());
  }

  ~WantsPopupControlCheck() {
    mEvent->SetWantsPopupControlCheck(mOriginalWantsPopupControlCheck);
  }

 private:
  Event* mEvent;
  bool mOriginalWantsPopupControlCheck;
};

}  // namespace dom
}  // namespace mozilla

#define NS_FORWARD_TO_EVENT                                           \
  NS_FORWARD_NSIDOMEVENT(Event::)                                     \
  virtual void PreventDefault(JSContext* aCx, CallerType aCallerType) \
      override {                                                      \
    Event::PreventDefault(aCx, aCallerType);                          \
  }

#define NS_FORWARD_NSIDOMEVENT_NO_SERIALIZATION_NO_DUPLICATION(_to)            \
  NS_IMETHOD GetType(nsAString& aType) override { return _to GetType(aType); } \
  NS_IMETHOD GetTarget(nsIDOMEventTarget** aTarget) override {                 \
    return _to GetTarget(aTarget);                                             \
  }                                                                            \
  NS_IMETHOD GetCurrentTarget(nsIDOMEventTarget** aCurrentTarget) override {   \
    return _to GetCurrentTarget(aCurrentTarget);                               \
  }                                                                            \
  NS_IMETHOD GetEventPhase(uint16_t* aEventPhase) override {                   \
    return _to GetEventPhase(aEventPhase);                                     \
  }                                                                            \
  NS_IMETHOD GetBubbles(bool* aBubbles) override {                             \
    return _to GetBubbles(aBubbles);                                           \
  }                                                                            \
  NS_IMETHOD GetCancelable(bool* aCancelable) override {                       \
    return _to GetCancelable(aCancelable);                                     \
  }                                                                            \
  NS_IMETHOD GetTimeStamp(DOMTimeStamp* aTimeStamp) override {                 \
    return _to GetTimeStamp(aTimeStamp);                                       \
  }                                                                            \
  NS_IMETHOD StopPropagation(void) override { return _to StopPropagation(); }  \
  NS_IMETHOD StopCrossProcessForwarding(void) override {                       \
    return _to StopCrossProcessForwarding();                                   \
  }                                                                            \
  NS_IMETHOD PreventDefault(void) override { return _to PreventDefault(); }    \
  void InitEvent(const nsAString& eventTypeArg, bool canBubbleArg,             \
                 bool cancelableArg) override {                                \
    _to InitEvent(eventTypeArg, canBubbleArg, cancelableArg);                  \
  }                                                                            \
  NS_IMETHOD GetDefaultPrevented(bool* aDefaultPrevented) override {           \
    return _to GetDefaultPrevented(aDefaultPrevented);                         \
  }                                                                            \
  NS_IMETHOD StopImmediatePropagation(void) override {                         \
    return _to StopImmediatePropagation();                                     \
  }                                                                            \
  NS_IMETHOD GetOriginalTarget(nsIDOMEventTarget** aOriginalTarget) override { \
    return _to GetOriginalTarget(aOriginalTarget);                             \
  }                                                                            \
  NS_IMETHOD GetExplicitOriginalTarget(                                        \
      nsIDOMEventTarget** aExplicitOriginalTarget) override {                  \
    return _to GetExplicitOriginalTarget(aExplicitOriginalTarget);             \
  }                                                                            \
  NS_IMETHOD GetIsTrusted(bool* aIsTrusted) override {                         \
    return _to GetIsTrusted(aIsTrusted);                                       \
  }                                                                            \
  NS_IMETHOD SetTarget(nsIDOMEventTarget* aTarget) override {                  \
    return _to SetTarget(aTarget);                                             \
  }                                                                            \
  NS_IMETHOD_(bool) IsDispatchStopped(void) override {                         \
    return _to IsDispatchStopped();                                            \
  }                                                                            \
  NS_IMETHOD_(WidgetEvent*) WidgetEventPtr(void) override {                    \
    return _to WidgetEventPtr();                                               \
  }                                                                            \
  NS_IMETHOD_(void) SetTrusted(bool aTrusted) override {                       \
    _to SetTrusted(aTrusted);                                                  \
  }                                                                            \
  NS_IMETHOD_(void) SetOwner(EventTarget* aOwner) override {                   \
    _to SetOwner(aOwner);                                                      \
  }                                                                            \
  NS_IMETHOD_(Event*) InternalDOMEvent() override {                            \
    return _to InternalDOMEvent();                                             \
  }                                                                            \
  NS_IMETHOD GetCancelBubble(bool* aCancelBubble) override {                   \
    return _to GetCancelBubble(aCancelBubble);                                 \
  }                                                                            \
  NS_IMETHOD SetCancelBubble(bool aCancelBubble) override {                    \
    return _to SetCancelBubble(aCancelBubble);                                 \
  }

#define NS_FORWARD_TO_EVENT_NO_SERIALIZATION_NO_DUPLICATION           \
  NS_FORWARD_NSIDOMEVENT_NO_SERIALIZATION_NO_DUPLICATION(Event::)     \
  virtual void PreventDefault(JSContext* aCx, CallerType aCallerType) \
      override {                                                      \
    Event::PreventDefault(aCx, aCallerType);                          \
  }

inline nsISupports* ToSupports(mozilla::dom::Event* e) {
  return static_cast<nsIDOMEvent*>(e);
}

inline nsISupports* ToCanonicalSupports(mozilla::dom::Event* e) {
  return static_cast<nsIDOMEvent*>(e);
}

already_AddRefed<mozilla::dom::Event> NS_NewDOMEvent(
    mozilla::dom::EventTarget* aOwner, nsPresContext* aPresContext,
    mozilla::WidgetEvent* aEvent);

#endif  // mozilla_dom_Event_h_