ViewTransition.h - mozsearch

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/* 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_ViewTransition_h

#define mozilla_dom_ViewTransition_h

#include "nsRect.h"

#include "nsWrapperCache.h"

#include "nsTHashMap.h"

class nsIGlobalObject;

class nsITimer;

namespace mozilla {

class ErrorResult;

namespace dom {

class Document;

class Element;

class Promise;

class ViewTransitionUpdateCallback;

enum class SkipTransitionReason : uint8_t {

JS,

  DocumentHidden,

  ClobberedActiveTransition,

  Timeout,

  UpdateCallbackRejected,

  DuplicateTransitionNameCapturingOldState,

  DuplicateTransitionNameCapturingNewState,

  Resize,

};

// https://drafts.csswg.org/css-view-transitions-1/#viewtransition-phase

enum class ViewTransitionPhase : uint8_t {

  PendingCapture = 0,

  UpdateCallbackCalled,

  Animating,

  Done,

};

class ViewTransition final : public nsISupports, public nsWrapperCache {

 public:

  using Phase = ViewTransitionPhase;

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS

  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(ViewTransition)

  ViewTransition(Document&, ViewTransitionUpdateCallback*);

  Promise* GetUpdateCallbackDone(ErrorResult&);

  Promise* GetReady(ErrorResult&);

  Promise* GetFinished(ErrorResult&);

  void SkipTransition(SkipTransitionReason = SkipTransitionReason::JS);

  void PerformPendingOperations();

  Element* GetRoot() const { return mViewTransitionRoot; }

  nsIGlobalObject* GetParentObject() const;

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

  struct CapturedElement;

 private:

  enum class CallIfDone : bool { No, Yes };

  MOZ_CAN_RUN_SCRIPT void CallUpdateCallbackIgnoringErrors(CallIfDone);

  MOZ_CAN_RUN_SCRIPT void CallUpdateCallback(ErrorResult&);

  void Activate();

  void ClearActiveTransition();

  void Timeout();

  void Setup();

  [[nodiscard]] Maybe<SkipTransitionReason> CaptureOldState();

  [[nodiscard]] Maybe<SkipTransitionReason> CaptureNewState();

  void SetupTransitionPseudoElements();

  void ClearNamedElements();

  void HandleFrame();

  void SkipTransition(SkipTransitionReason, JS::Handle<JS::Value>);

  void ClearTimeoutTimer();

  nsRect SnapshotContainingBlockRect() const;

  ~ViewTransition();

  // Stored for the whole lifetime of the object (until CC).

  RefPtr<Document> mDocument;

  RefPtr<ViewTransitionUpdateCallback> mUpdateCallback;

  // https://drafts.csswg.org/css-view-transitions/#viewtransition-named-elements

  using NamedElements = nsTHashMap<RefPtr<nsAtom>, UniquePtr<CapturedElement>>;

  NamedElements mNamedElements;

  // https://drafts.csswg.org/css-view-transitions/#viewtransition-initial-snapshot-containing-block-size

  nsSize mInitialSnapshotContainingBlockSize;

  // Allocated lazily, but same object once allocated (again until CC).

  RefPtr<Promise> mUpdateCallbackDonePromise;

  RefPtr<Promise> mReadyPromise;

  RefPtr<Promise> mFinishedPromise;

  static void TimeoutCallback(nsITimer*, void*);

  RefPtr<nsITimer> mTimeoutTimer;

  Phase mPhase = Phase::PendingCapture;

  RefPtr<Element> mViewTransitionRoot;

};

}  // namespace dom

}  // namespace mozilla

#endif