flow/layers/container_layer.h

// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef FLUTTER_FLOW_LAYERS_CONTAINER_LAYER_H_
#define FLUTTER_FLOW_LAYERS_CONTAINER_LAYER_H_

#include <vector>

#include "flutter/flow/layers/layer.h"

namespace flutter {

class ContainerLayer : public Layer {
 public:
  ContainerLayer();

  void Diff(DiffContext* context, const Layer* old_layer) override;
  void PreservePaintRegion(DiffContext* context) override;

  virtual void Add(std::shared_ptr<Layer> layer);

  void Preroll(PrerollContext* context, const SkMatrix& matrix) override;
  void Paint(PaintContext& context) const override;

  const std::vector<std::shared_ptr<Layer>>& layers() const { return layers_; }

  virtual void DiffChildren(DiffContext* context,
                            const ContainerLayer* old_layer);

  void PaintChildren(PaintContext& context) const override;

  const ContainerLayer* as_container_layer() const override { return this; }

  const SkRect& child_paint_bounds() const { return child_paint_bounds_; }

 protected:
  void PrerollChildren(PrerollContext* context,
                       const SkMatrix& child_matrix,
                       SkRect* child_paint_bounds);

 private:
  std::vector<std::shared_ptr<Layer>> layers_;
  SkRect child_paint_bounds_;

  FML_DISALLOW_COPY_AND_ASSIGN(ContainerLayer);
};

}  // namespace flutter

#endif  // FLUTTER_FLOW_LAYERS_CONTAINER_LAYER_H_