Index: third_party/WebKit/Source/platform/scroll/SmoothScrollSequencer.h |
diff --git a/third_party/WebKit/Source/platform/scroll/SmoothScrollSequencer.h b/third_party/WebKit/Source/platform/scroll/SmoothScrollSequencer.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..3c72499c587766dd357627092074c388ee8c2eba |
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+++ b/third_party/WebKit/Source/platform/scroll/SmoothScrollSequencer.h |
@@ -0,0 +1,41 @@ |
+// 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 SmoothScrollSequencer_h |
+#define SmoothScrollSequencer_h |
+ |
+#include <utility> |
+#include "platform/heap/Handle.h" |
+#include "platform/scroll/ScrollTypes.h" |
+ |
+namespace blink { |
+ |
+class ScrollableArea; |
+ |
+// 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 PLATFORM_EXPORT SmoothScrollSequencer final |
+ : public GarbageCollected<SmoothScrollSequencer> { |
+ public: |
+ SmoothScrollSequencer(); |
+ // Add a scroll offset animation to the back of a queue. |
+ void QueueAnimation(ScrollableArea*, ScrollOffset); |
+ |
+ // 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(); |
+ |
+ DECLARE_TRACE(); |
+ |
+ private: |
+ typedef std::pair<Member<ScrollableArea>, ScrollOffset> ScrollerAndOffsetPair; |
+ HeapVector<ScrollerAndOffsetPair> queue_; |
+ Member<ScrollableArea> current_scrollable_; |
+}; |
+ |
+} // namespace blink |
+ |
+#endif // SmoothScrollSequencer_h |