129 lines
3.4 KiB
C++
129 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_ResizeObserverController_h
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#define mozilla_dom_ResizeObserverController_h
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#include "mozilla/dom/ResizeObserver.h"
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#include "mozilla/TimeStamp.h"
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#include "nsRefreshDriver.h"
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namespace mozilla {
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namespace dom {
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class ResizeObserverController;
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/*
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* ResizeObserverNotificationHelper will trigger ResizeObserver notifications
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* by registering with the Refresh Driver.
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*/
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class ResizeObserverNotificationHelper final : public nsARefreshObserver
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{
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public:
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NS_INLINE_DECL_REFCOUNTING(ResizeObserverNotificationHelper, override)
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explicit ResizeObserverNotificationHelper(ResizeObserverController* aOwner)
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: mOwner(aOwner)
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, mRegistered(false)
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{
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MOZ_ASSERT(mOwner, "Need a non-null owner");
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}
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void WillRefresh(TimeStamp aTime) override;
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nsRefreshDriver* GetRefreshDriver() const;
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void Register();
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void Unregister();
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void Disconnect();
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protected:
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virtual ~ResizeObserverNotificationHelper();
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ResizeObserverController* mOwner;
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bool mRegistered;
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};
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/*
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* ResizeObserverController contains the list of ResizeObservers and controls
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* the flow of notification.
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*/
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class ResizeObserverController final
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{
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public:
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explicit ResizeObserverController(nsIDocument* aDocument)
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: mDocument(aDocument)
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, mIsNotificationActive(false)
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{
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MOZ_ASSERT(mDocument, "Need a non-null document");
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mResizeObserverNotificationHelper =
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new ResizeObserverNotificationHelper(this);
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}
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// Methods for supporting cycle-collection
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void Traverse(nsCycleCollectionTraversalCallback& aCb);
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void Unlink();
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void AddResizeObserver(ResizeObserver* aObserver);
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/*
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* Schedule the notification via ResizeObserverNotificationHelper refresh
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* observer.
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*/
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void ScheduleNotification();
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/*
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* Notify all ResizeObservers by gathering and broadcasting all active
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* observations.
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*/
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void Notify();
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nsIPresShell* GetShell() const;
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~ResizeObserverController();
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private:
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/*
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* Calls GatherActiveObservations(aDepth) for all ResizeObservers in this
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* controller. All observations in each ResizeObserver with element's depth
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* more than aDepth will be gathered.
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*/
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void GatherAllActiveObservations(uint32_t aDepth);
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/*
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* Calls BroadcastActiveObservations() for all ResizeObservers in this
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* controller. It also returns the shallowest depth of observed target
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* elements from all ResizeObserver or UINT32_MAX if there is no any
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* active obsevations at all.
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*/
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uint32_t BroadcastAllActiveObservations();
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/*
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* Returns whether there is any ResizeObserver that has active observations.
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*/
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bool HasAnyActiveObservations() const;
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/*
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* Returns whether there is any ResizeObserver that has skipped observations.
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*/
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bool HasAnySkippedObservations() const;
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protected:
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// Raw pointer is OK because mDocument strongly owns us & hence must outlive
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// us.
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nsIDocument* const mDocument;
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RefPtr<ResizeObserverNotificationHelper> mResizeObserverNotificationHelper;
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nsTArray<RefPtr<ResizeObserver>> mResizeObservers;
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bool mIsNotificationActive;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_ResizeObserverController_h
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