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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_ELEMENTS_TRANSIENT_ELEMENT_H_
#define CHROME_BROWSER_VR_ELEMENTS_TRANSIENT_ELEMENT_H_
#include "base/functional/callback.h"
#include "base/time/time.h"
#include "chrome/browser/vr/elements/ui_element.h"
#include "chrome/browser/vr/vr_ui_export.h"
namespace vr {
// Base class for a transient element that automatically hides itself after some
// point in time. The exacly transience behavior depends on the subclass.
class VR_UI_EXPORT TransientElement : public UiElement {
public:
TransientElement(const TransientElement&) = delete;
TransientElement& operator=(const TransientElement&) = delete;
~TransientElement() override;
// Sets the elements visibility to the given value. If the visibility is
// changing to true, it stays visible for the set timeout.
void SetVisible(bool visible) override;
void SetVisibleImmediately(bool visible) override;
// Resets the time this element stays visible for if the element is currently
// visible.
void RefreshVisible();
protected:
explicit TransientElement(const base::TimeDelta& timeout);
virtual void Reset();
base::TimeDelta timeout_;
base::TimeTicks set_visible_time_;
private:
typedef UiElement super;
};
// An element that hides itself after after a set timeout.
class VR_UI_EXPORT SimpleTransientElement : public TransientElement {
public:
explicit SimpleTransientElement(const base::TimeDelta& timeout);
SimpleTransientElement(const SimpleTransientElement&) = delete;
SimpleTransientElement& operator=(const SimpleTransientElement&) = delete;
~SimpleTransientElement() override;
private:
bool OnBeginFrame(const gfx::Transform& head_pose) override;
typedef TransientElement super;
};
// The reason why a transient element hid itself. Note that this is only used by
// ShowUntilSignalTransientElement below.
enum class TransientElementHideReason : int {
kTimeout,
kSignal,
};
} // namespace vr
#endif // CHROME_BROWSER_VR_ELEMENTS_TRANSIENT_ELEMENT_H_
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