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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_INPUT_MAIN_THREAD_SCROLLING_REASON_H_
#define CC_INPUT_MAIN_THREAD_SCROLLING_REASON_H_
namespace cc {
// Ensure this stays in sync with MainThreadScrollingReason in histograms.xml,
// and that this extends ScrollingCoordinator::MainThreadScrollingReason.
// ScrollingCoordinator::MainThreadScrollingReason contains the flags
// which are associated with a layer. The flags only contained in
// MainThreadScrollingReason are computed for each scroll begin.
struct MainThreadScrollingReason {
// Non-transient scrolling reasons.
enum : uint32_t { kNotScrollingOnMain = 0 };
enum : uint32_t { kHasBackgroundAttachmentFixedObjects = 1 << 0 };
enum : uint32_t { kHasNonLayerViewportConstrainedObjects = 1 << 1 };
enum : uint32_t { kThreadedScrollingDisabled = 1 << 2 };
enum : uint32_t { kScrollbarScrolling = 1 << 3 };
enum : uint32_t { kPageOverlay = 1 << 4 };
enum : uint32_t { kMaxNonTransientScrollingReason = kPageOverlay };
// Transient scrolling reasons.
enum : uint32_t { kNonFastScrollableRegion = 1 << 5 };
enum : uint32_t { kEventHandlers = 1 << 6 };
enum : uint32_t { kFailedHitTest = 1 << 7 };
enum : uint32_t { kNoScrollingLayer = 1 << 8 };
enum : uint32_t { kNotScrollable = 1 << 9 };
enum : uint32_t { kContinuingMainThreadScroll = 1 << 10 };
enum : uint32_t { kNonInvertibleTransform = 1 << 11 };
enum : uint32_t { kPageBasedScrolling = 1 << 12 };
// The number of flags in this struct (excluding itself).
enum : uint32_t { kMainThreadScrollingReasonCount = 14 };
};
} // namespace cc
#endif // CC_INPUT_MAIN_THREAD_SCROLLING_REASON_H_
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