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// Copyright 2017 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_VR_VR_TAB_HELPER_H_
#define CHROME_BROWSER_VR_VR_TAB_HELPER_H_
#include "base/observer_list.h"
#include "base/observer_list_types.h"
#include "content/public/browser/web_contents_user_data.h"
namespace vr {
class VrTabHelper : public content::WebContentsUserData<VrTabHelper> {
public:
VrTabHelper(const VrTabHelper&) = delete;
VrTabHelper& operator=(const VrTabHelper&) = delete;
~VrTabHelper() override;
class Observer : public base::CheckedObserver {
public:
virtual void OnIsContentDisplayedInHeadsetChanged(bool state) = 0;
};
bool is_in_vr() const { return is_in_vr_; }
// Called by VrShell when we enter and exit vr mode. It finds us by looking us
// up on the WebContents.
void SetIsInVr(bool is_in_vr);
bool is_content_displayed_in_headset() const {
return is_content_displayed_in_headset_;
}
void SetIsContentDisplayedInHeadset(bool state);
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
static bool IsInVr(content::WebContents* contents);
static bool IsContentDisplayedInHeadset(content::WebContents* contents);
static void SetIsContentDisplayedInHeadset(content::WebContents* contents,
bool state);
static void ExitVrPresentation();
private:
explicit VrTabHelper(content::WebContents* contents);
friend class content::WebContentsUserData<VrTabHelper>;
// If is_in_vr_ is true, that means that the only content displayed is
// inside vr (for example, VR browsing or immersive experience
// on an Android phone with headset on).
// If is_content_displayed_in_headset_ is true, it means content is displayed
// both in VR and on the desktop (example: presenting WebXR
// content from a browser on Windows).
//
// If we have external monitors on Android, we'd want
// is_content_displayed_in_headset_ to be true there, and likewise
// is_in_vr_ could be true if content was only available in-headset on
// Windows.
// TODO(cassew): Rename below vars to more intuitive names.
bool is_in_vr_ = false;
bool is_content_displayed_in_headset_ = false;
base::ObserverList<Observer> observers_;
WEB_CONTENTS_USER_DATA_KEY_DECL();
};
} // namespace vr
#endif // CHROME_BROWSER_VR_VR_TAB_HELPER_H_
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