ParallaxTransformItem.h

/*
 * Copyright (C) 2014 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef PARALLAXTRANSFORMITEM_H
#define PARALLAXTRANSFORMITEM_H

#include <QQuickItem>

class Actor;

class ParallaxTransformItem : public QQuickItem {
    Q_OBJECT

    Q_PROPERTY(float zDepth READ getZDepth WRITE setZDepth NOTIFY zDepthChanged)

public:
    constexpr static const float REFERENCE_DEPTH = 1.0f;

    explicit ParallaxTransformItem(QQuickItem* parent = 0);
    virtual ~ParallaxTransformItem();

    float getZDepth() const { return mZDepth; }
    void setZDepth(float value);

signals:
    void zDepthChanged();

protected:
    virtual void componentComplete() override;

private:
    void updateItemOffset();
    void updateProjectionRatio();

    Actor* mActor = nullptr;
    float mZDepth = REFERENCE_DEPTH;
    float mZProjectionRatioX = 0.0f;
    float mZProjectionRatioY = 0.0f;
};
Q_DECLARE_METATYPE(ParallaxTransformItem*)

#endif // PARALLAXTRANSFORMITEM_H