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// Copyright 2023 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_PRELOADING_PREVIEW_PREVIEW_MANAGER_H_
#define CHROME_BROWSER_PRELOADING_PREVIEW_PREVIEW_MANAGER_H_
#include <memory>
#include "base/memory/weak_ptr.h"
#include "content/public/browser/page.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/browser/web_contents_user_data.h"
class GURL;
class PreviewTab;
class PreviewZoomController;
namespace content {
class PreviewCancelReason;
} // namespace content
// Handles requests of preview and manages ongoing previews.
class PreviewManager final
: public content::WebContentsObserver,
public content::WebContentsUserData<PreviewManager> {
public:
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class Usage {
// LinkPreview feature is not used in the page at all.
kNotUsed = 0,
// Preview windows are opened for the page at least once,
// but they are not promoted.
kUsedButNotPromoted = 1,
// Preview windows are opened for the page and one of them is promoted.
kUsedAndPromoted = 2,
kMaxValue = kUsedAndPromoted,
};
PreviewManager(const PreviewManager&) = delete;
PreviewManager& operator=(const PreviewManager&) = delete;
~PreviewManager() override;
// content::WebContentsObserver implementation:
void PrimaryPageChanged(content::Page& page) override;
void InitiatePreview(const GURL& url);
void Cancel(content::PreviewCancelReason reason);
void PromoteToNewTab();
Usage usage() { return usage_; }
base::WeakPtr<content::WebContents> GetWebContentsForPreviewTab();
// This method closes a preview page, and used for testing until the primary
// page navigation closes existing preview pages.
void CloseForTesting();
PreviewZoomController* PreviewZoomControllerForTesting() const;
private:
friend class content::WebContentsUserData<PreviewManager>;
explicit PreviewManager(content::WebContents* web_contents);
Usage usage_ = Usage::kNotUsed;
std::unique_ptr<PreviewTab> tab_;
base::WeakPtrFactory<PreviewManager> weak_factory_{this};
WEB_CONTENTS_USER_DATA_KEY_DECL();
};
#endif // CHROME_BROWSER_PRELOADING_PREVIEW_PREVIEW_MANAGER_H_
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