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// Copyright 2019 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_WEBUI_TAB_STRIP_THUMBNAIL_TRACKER_H_
#define CHROME_BROWSER_UI_WEBUI_TAB_STRIP_THUMBNAIL_TRACKER_H_
#include <memory>
#include "base/containers/flat_map.h"
#include "base/memory/scoped_refptr.h"
#include "chrome/browser/ui/thumbnails/thumbnail_image.h"
namespace content {
class WebContents;
}
// Tracks the thumbnails of a set of WebContentses. This set is dynamically
// managed, and WebContents closure is handled gracefully. The user is notified
// of any thumbnail change via a callback specified on construction.
class ThumbnailTracker {
public:
using CompressedThumbnailData = ThumbnailImage::CompressedThumbnailData;
// Should return the ThumbnailImage instance for a WebContents.
using GetThumbnailCallback =
base::RepeatingCallback<scoped_refptr<ThumbnailImage>(
content::WebContents*)>;
// Handles a thumbnail update for a tab.
using ThumbnailUpdatedCallback =
base::RepeatingCallback<void(content::WebContents*,
CompressedThumbnailData)>;
explicit ThumbnailTracker(ThumbnailUpdatedCallback callback);
// Specifies how to get a ThumbnailImage for a WebContents. This is intended
// for tests.
ThumbnailTracker(ThumbnailUpdatedCallback callback,
GetThumbnailCallback thumbnail_getter);
~ThumbnailTracker();
// Registers a tab to receive thumbnail updates for. Also immediately requests
// the current thumbnail.
void AddTab(content::WebContents* contents);
void RemoveTab(content::WebContents* contents);
private:
void ThumbnailUpdated(content::WebContents* contents,
CompressedThumbnailData image);
void ContentsClosed(content::WebContents* contents);
// The default |GetThumbnailCallback| implementation.
static scoped_refptr<ThumbnailImage> GetThumbnailFromTabHelper(
content::WebContents* contents);
GetThumbnailCallback thumbnail_getter_;
ThumbnailUpdatedCallback callback_;
// ContentsData tracks a particular WebContents. One is created for a tab on
// its first thumbnail request and exists until the contents is closed.
class ContentsData;
base::flat_map<content::WebContents*, std::unique_ptr<ContentsData>>
contents_data_;
};
#endif // CHROME_BROWSER_UI_WEBUI_TAB_STRIP_THUMBNAIL_TRACKER_H_
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