/*

 * Copyright 2017 Google Inc.

 *

 * Use of this source code is governed by a BSD-style license that can be

 * found in the LICENSE file.

 */

#ifndef SkSGGroup_DEFINED

#define SkSGGroup_DEFINED

#include "include/core/SkRect.h"

#include "include/core/SkRefCnt.h"

#include "modules/sksg/include/SkSGRenderNode.h"

#include <cstddef>

#include <utility>

#include <vector>

class SkCanvas;

class SkMatrix;

struct SkPoint;

namespace sksg {

class InvalidationController;

/**

 * Concrete node, grouping together multiple descendants.

 */

class Group : public RenderNode {

public:

    static sk_sp<Group> Make() {

        return sk_sp<Group>(new Group(std::vector<sk_sp<RenderNode>>()));

    }

    static sk_sp<Group> Make(std::vector<sk_sp<RenderNode>> children) {

        return sk_sp<Group>(new Group(std::move(children)));

    }

    void addChild(sk_sp<RenderNode>);

    void removeChild(const sk_sp<RenderNode>&);

    size_t size() const { return fChildren.size(); }

    bool  empty() const { return fChildren.empty(); }

    void  clear();

protected:

    Group();

    explicit Group(std::vector<sk_sp<RenderNode>>);

    ~Group() override;

    void onRender(SkCanvas*, const RenderContext*) const override;

    const RenderNode* onNodeAt(const SkPoint&)     const override;

    SkRect onRevalidate(InvalidationController*, const SkMatrix&) override;

private:

    std::vector<sk_sp<RenderNode>> fChildren;

    bool                           fRequiresIsolation = true;

    using INHERITED = RenderNode;

};

} // namespace sksg

#endif // SkSGGroup_DEFINED