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// Copyright (c) 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.
#include <unordered_map>
#include "cc/animation/scroll_offset_animations_impl.h"
#include "cc/trees/mutator_host_client.h"
namespace cc {
// A ScrollOffsetAnimationUpdate represents a change on the main thread
// that may impact an impl-only scroll offset animation.
// Note that this class only exists on the main thread.
struct CC_EXPORT ScrollOffsetAnimationUpdate {
explicit ScrollOffsetAnimationUpdate(ElementId);
// The element to which this update applies.
ElementId element_id_;
// The amount by which the scroll offset is changed on the main thread.
gfx::Vector2dF adjustment_;
// If set to true, abort the currently running impl only scroll offset
// animation running on cc and finish it on the main thread.
bool takeover_;
// ScrollOffsetAnimations contains a list of ScrollOffsetAnimationUpdates.
// PushPropertiesTo is called during commit time and the necessary update is
// made to the impl-only animation.
class CC_EXPORT ScrollOffsetAnimations {
explicit ScrollOffsetAnimations(AnimationHost* animation_host);
void AddAdjustmentUpdate(ElementId, gfx::Vector2dF adjustment);
void AddTakeoverUpdate(ElementId);
bool HasUpdatesForTesting() const;
// Goes through the updates in the order in which they're added and calls the
// appropriate handler for each update.
void PushPropertiesTo(ScrollOffsetAnimationsImpl*);
ScrollOffsetAnimationUpdate GetUpdateForElementId(ElementId) const;
using ElementToUpdateMap =
std::unordered_map<ElementId, ScrollOffsetAnimationUpdate, ElementIdHash>;
ElementToUpdateMap element_to_update_map_;
AnimationHost* animation_host_;
} // namespace cc