// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cc/input/scroll_state.h"

#include "cc/layers/layer_impl.h"

namespace cc {

ScrollState::ScrollState(double delta_x,
                         double delta_y,
                         int start_position_x,
                         int start_position_y,
                         bool should_propagate,
                         bool delta_consumed_for_scroll_sequence,
                         bool is_direct_manipulation)
    : data_(new ScrollStateData(delta_x,
                                delta_y,
                                start_position_x,
                                start_position_y,
                                should_propagate,
                                delta_consumed_for_scroll_sequence,
                                is_direct_manipulation)) {}

ScrollState::ScrollState(scoped_ptr<ScrollStateData> data) {
  data_ = data.Pass();
}

ScrollState::~ScrollState() {}

void ScrollState::ConsumeDelta(double x, double y) {
  data_->delta_x -= x;
  data_->delta_y -= y;

  if (x || y)
    data_->delta_consumed_for_scroll_sequence = true;
}

void ScrollState::DistributeToScrollChainDescendant() {
  if (!scroll_chain_.empty()) {
    LayerImpl* next = scroll_chain_.front();
    scroll_chain_.pop_front();
    next->DistributeScroll(this);
  }
}

}  // namespace cc