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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_SCALED_DEPTH_ADJUSTER_H_
#define CHROME_BROWSER_VR_ELEMENTS_SCALED_DEPTH_ADJUSTER_H_
#include <sstream>
#include "chrome/browser/vr/elements/ui_element.h"
#include "chrome/browser/vr/vr_ui_export.h"
#include "ui/gfx/geometry/transform.h"
namespace vr {
// A Scaler adjusts the depth of its descendents by applying a scale. This
// permits dimensions in the subtree to be expressed in DM directly. Its main
// contribution is a tailored local transform that accounts for adjustments made
// by other ScaledDepthAdjuster elements on its ancestor chain.
class VR_UI_EXPORT ScaledDepthAdjuster : public UiElement {
public:
explicit ScaledDepthAdjuster(float delta_z);
ScaledDepthAdjuster(const ScaledDepthAdjuster&) = delete;
ScaledDepthAdjuster& operator=(const ScaledDepthAdjuster&) = delete;
~ScaledDepthAdjuster() override;
private:
gfx::Transform LocalTransform() const override;
gfx::Transform GetTargetLocalTransform() const override;
bool OnBeginFrame(const gfx::Transform& head_pose) override;
#ifndef NDEBUG
void DumpGeometry(std::ostringstream* os) const override;
#endif
gfx::Transform transform_;
// This is relative to its ancestor ScaledDepthAdjuster. For example, if we
// have a single ScaledDepthAdjuster ancestor and it translates to depth 2.5,
// if we use a delta_z_ of -0.1, this will cause our descendants to be
// positioned at depth 2.4.
float delta_z_;
};
} // namespace vr
#endif // CHROME_BROWSER_VR_ELEMENTS_SCALED_DEPTH_ADJUSTER_H_
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