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61 lines
1.8 KiB
C++
61 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_image_IProgressObserver_h
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#define mozilla_image_IProgressObserver_h
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#include "mozilla/WeakPtr.h"
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#include "nsISupports.h"
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#include "nsRect.h"
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class nsIEventTarget;
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namespace mozilla {
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namespace image {
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/**
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* An interface for observing changes to image state, as reported by
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* ProgressTracker.
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*
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* This is the ImageLib-internal version of imgINotificationObserver,
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* essentially, with implementation details that code outside of ImageLib
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* shouldn't see.
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*
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* XXX(seth): It's preferable to avoid adding anything to this interface if
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* possible. In the long term, it would be ideal to get to a place where we can
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* just use the imgINotificationObserver interface internally as well.
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*/
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class IProgressObserver : public SupportsWeakPtr<IProgressObserver>
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{
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public:
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MOZ_DECLARE_WEAKREFERENCE_TYPENAME(IProgressObserver)
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// Subclasses may or may not be XPCOM classes, so we just require that they
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// implement AddRef and Release.
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NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING
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// imgINotificationObserver methods:
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virtual void Notify(int32_t aType, const nsIntRect* aRect = nullptr) = 0;
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virtual void OnLoadComplete(bool aLastPart) = 0;
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// Other, internal-only methods:
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virtual void SetHasImage() = 0;
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virtual bool NotificationsDeferred() const = 0;
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virtual void SetNotificationsDeferred(bool aDeferNotifications) = 0;
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virtual already_AddRefed<nsIEventTarget> GetEventTarget() const
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{
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return nullptr;
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}
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protected:
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virtual ~IProgressObserver() { }
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};
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} // namespace image
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} // namespace mozilla
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#endif // mozilla_image_IProgressObserver_h
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