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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 */
#ifndef mozilla_widget_IconLoader_h_
#define mozilla_widget_IconLoader_h_
#include "imgINotificationObserver.h"
#include "mozilla/RefPtr.h"
#include "nsCOMPtr.h"
#include "nsISupports.h"
class nsIURI;
class nsINode;
class imgRequestProxy;
class imgIContainer;
namespace mozilla::widget {
* IconLoader is a utility for loading icons from either the disk or over
* the network, and then using them in native OS widgetry like the macOS
* global menu bar or the Windows notification area.
class IconLoader : public imgINotificationObserver {
// This is the interface that our listeners need to implement so that they can
// be notified when the icon is loaded.
class Listener {
virtual nsresult OnComplete(imgIContainer* aContainer) = 0;
// Create the loader.
// aListener will be notified when the load is complete.
// The loader does not keep an owning reference to the listener. Call Destroy
// before the listener goes away.
explicit IconLoader(Listener* aListener);
// LoadIcon will start a load request for the icon.
// The request may not complete until after LoadIcon returns.
// If aIsInternalIcon is true, the document and principal will not be
// used when loading.
nsresult LoadIcon(nsIURI* aIconURI, nsINode* aNode,
bool aIsInternalIcon = false);
void Destroy();
virtual ~IconLoader();
RefPtr<imgRequestProxy> mIconRequest;
// The listener, which is notified when loading completes.
// Can be null, after a call to Destroy.
// This is a non-owning reference and needs to be cleared with a call to
// Destroy before the listener goes away.
Listener* mListener;
} // namespace mozilla::widget
#endif // mozilla_widget_IconLoader_h_