SkSGGroup.h

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/*
 * 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