| // Copyright (c) 2017 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 THIRD_PARTY_BLINK_RENDERER_CORE_SCROLL_SMOOTH_SCROLL_SEQUENCER_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_SCROLL_SMOOTH_SCROLL_SEQUENCER_H_ |
| |
| #include <utility> |
| |
| #include "third_party/blink/renderer/core/core_export.h" |
| #include "third_party/blink/renderer/platform/heap/handle.h" |
| #include "third_party/blink/renderer/platform/scroll/scroll_types.h" |
| |
| namespace blink { |
| |
| class ScrollableArea; |
| |
| struct SequencedScroll final : public GarbageCollected<SequencedScroll> { |
| SequencedScroll(); |
| |
| SequencedScroll(ScrollableArea* area, |
| ScrollOffset offset, |
| ScrollBehavior behavior) |
| : scrollable_area(area), |
| scroll_offset(offset), |
| scroll_behavior(behavior) {} |
| |
| SequencedScroll(const SequencedScroll& other) |
| : scrollable_area(other.scrollable_area), |
| scroll_offset(other.scroll_offset), |
| scroll_behavior(other.scroll_behavior) {} |
| |
| Member<ScrollableArea> scrollable_area; |
| ScrollOffset scroll_offset; |
| ScrollBehavior scroll_behavior; |
| |
| void Trace(blink::Visitor*); |
| }; |
| |
| // A sequencer that queues the nested scrollers from inside to outside, |
| // so that they can be animated from outside to inside when smooth scroll |
| // is called. |
| class CORE_EXPORT SmoothScrollSequencer final |
| : public GarbageCollected<SmoothScrollSequencer> { |
| public: |
| SmoothScrollSequencer() : scroll_type_(kProgrammaticScroll) {} |
| void SetScrollType(ScrollType type) { scroll_type_ = type; } |
| |
| // Add a scroll offset animation to the back of a queue. |
| void QueueAnimation(ScrollableArea*, ScrollOffset, ScrollBehavior); |
| |
| // Run the animation at the back of the queue. |
| void RunQueuedAnimations(); |
| |
| // Abort the currently running animation and all the animations in the queue. |
| void AbortAnimations(); |
| |
| // Given the incoming scroll's scroll type, returns whether to filter the |
| // incoming scroll. It may also abort the current sequenced scroll. |
| bool FilterNewScrollOrAbortCurrent(ScrollType incoming_type); |
| |
| void DidDisposeScrollableArea(const ScrollableArea&); |
| |
| void Trace(blink::Visitor*); |
| |
| private: |
| HeapVector<Member<SequencedScroll>> queue_; |
| Member<ScrollableArea> current_scrollable_; |
| ScrollType scroll_type_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_SCROLL_SMOOTH_SCROLL_SEQUENCER_H_ |