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// Copyright 2016 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.
#ifndef CC_TREES_SCROLL_NODE_H_
#define CC_TREES_SCROLL_NODE_H_
#include "cc/base/filter_operations.h"
#include "cc/base/region.h"
#include "cc/cc_export.h"
#include "ui/gfx/geometry/size.h"
namespace base {
namespace trace_event {
class TracedValue;
} // namespace trace_event
} // namespace base
namespace cc {
struct CC_EXPORT ScrollNode {
ScrollNode();
ScrollNode(const ScrollNode& other);
// The node index of this node in the scroll tree node vector.
int id;
// The node index of the parent node in the scroll tree node vector.
int parent_id;
// The layer id that corresponds to the layer contents that are scrolled.
// Unlike |id|, this id is stable across frames that don't change the
// composited layer list.
int owning_layer_id;
// This is used for subtrees that should not be scrolled independently. For
// example, when there is a layer that is not scrollable itself but is inside
// a scrolling layer.
bool scrollable;
uint32_t main_thread_scrolling_reasons;
Region non_fast_scrollable_region;
// Size of the clipped area, not including non-overlay scrollbars. Overlay
// scrollbars do not affect the clipped area.
gfx::Size scroll_clip_layer_bounds;
// Bounds of the overflow scrolling area.
gfx::Size bounds;
bool max_scroll_offset_affected_by_page_scale;
bool scrolls_inner_viewport;
bool scrolls_outer_viewport;
// This offset is used when |scrollable| is false and there isn't a transform
// node already present that covers this offset.
gfx::Vector2dF offset_to_transform_parent;
bool should_flatten;
bool user_scrollable_horizontal;
bool user_scrollable_vertical;
ElementId element_id;
int transform_id;
bool operator==(const ScrollNode& other) const;
void AsValueInto(base::trace_event::TracedValue* value) const;
};
} // namespace cc
#endif // CC_TREES_SCROLL_NODE_H_
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