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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UI_VIEWS_TABS_TAB_HOVER_CARD_THUMBNAIL_OBSERVER_H_
#define CHROME_BROWSER_UI_VIEWS_TABS_TAB_HOVER_CARD_THUMBNAIL_OBSERVER_H_
#include <memory>
#include "base/callback_list.h"
#include "chrome/browser/ui/thumbnails/thumbnail_image.h"
// Tracks a specific thumbnail, or no thumbnail. Provides a callback for when
// image data for the current thumbnail is available.
class TabHoverCardThumbnailObserver {
public:
using CallbackSignature = void(TabHoverCardThumbnailObserver* observer,
gfx::ImageSkia thumbnail);
using Callback = base::RepeatingCallback<CallbackSignature>;
TabHoverCardThumbnailObserver();
~TabHoverCardThumbnailObserver();
// Begin watching the specified thumbnail image for updates. Ideally, should
// trigger the associated WebContents to load (if not loaded already) and
// retrieve a valid thumbnail.
void Observe(scoped_refptr<ThumbnailImage> thumbnail_image);
// Returns the current (most recent) thumbnail being watched.
const scoped_refptr<ThumbnailImage>& current_image() const {
return current_image_;
}
base::CallbackListSubscription AddCallback(Callback callback);
private:
void ThumbnailImageCallback(const ThumbnailImage* image,
gfx::ImageSkia preview_image);
scoped_refptr<ThumbnailImage> current_image_;
std::unique_ptr<ThumbnailImage::Subscription> subscription_;
base::RepeatingCallbackList<CallbackSignature> callback_list_;
};
#endif // CHROME_BROWSER_UI_VIEWS_TABS_TAB_HOVER_CARD_THUMBNAIL_OBSERVER_H_
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