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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_VIEWPORT_AWARE_ROOT_H_
#define CHROME_BROWSER_VR_ELEMENTS_VIEWPORT_AWARE_ROOT_H_
#include "chrome/browser/vr/elements/ui_element.h"
#include "chrome/browser/vr/vr_ui_export.h"
#include "ui/gfx/geometry/transform.h"
namespace vr {
// This class is the root of all viewport aware elements. It calcuates the
// yaw rotation which all elements need to apply to be visible in current
// viewport.
class VR_UI_EXPORT ViewportAwareRoot : public UiElement {
public:
static const float kViewportRotationTriggerDegrees;
ViewportAwareRoot();
ViewportAwareRoot(const ViewportAwareRoot&) = delete;
ViewportAwareRoot& operator=(const ViewportAwareRoot&) = delete;
~ViewportAwareRoot() override;
void Reset();
bool HasVisibleChildren();
void SetRecenterOnRotate(bool recenter_on_rotate) {
recenter_on_rotate_ = true;
}
protected:
// Returns true if the rotation was adjusted.
// Virtual for tests.
virtual bool AdjustRotationForHeadPose(const gfx::Vector3dF& look_at);
virtual bool AdjustTranslation(float head_x, float head_z, bool did_rotate);
private:
bool OnBeginFrame(const gfx::Transform& head_pose) override;
float viewport_aware_total_rotation_ = 0.f;
float x_center = 0;
float z_center = 0;
bool children_visible_ = false;
bool recenter_on_rotate_ = false;
};
} // namespace vr
#endif // CHROME_BROWSER_VR_ELEMENTS_VIEWPORT_AWARE_ROOT_H_
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