1/*
2 * Copyright (C) 2016 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include <wtf/Vector.h>
29
30namespace WebCore {
31
32template <typename T>
33struct ScrollOffsetRange {
34 T start;
35 T end;
36};
37
38template <typename T>
39struct ScrollSnapOffsetsInfo {
40 Vector<T> horizontalSnapOffsets;
41 Vector<T> verticalSnapOffsets;
42
43 // Snap offset ranges represent non-empty ranges of scroll offsets in which scrolling may rest after scroll snapping.
44 // These are used in two cases: (1) for proximity scroll snapping, where portions of areas between adjacent snap offsets
45 // may emit snap offset ranges, and (2) in the case where the snap area is larger than the snap port, in which case areas
46 // where the snap port fits within the snap area are considered to be valid snap positions.
47 Vector<ScrollOffsetRange<T>> horizontalSnapOffsetRanges;
48 Vector<ScrollOffsetRange<T>> verticalSnapOffsetRanges;
49};
50
51}; // namespace WebCore
52