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Side by Side Diff: ui/events/gesture_curve.h

Issue 634373003: Consolidate content fling implementations (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Fix win build Created 6 years, 2 months ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef UI_EVENTS_GESTURE_CURVE_H_
6 #define UI_EVENTS_GESTURE_CURVE_H_
7
8 #include "base/time/time.h"
9 #include "ui/gfx/geometry/vector2d_f.h"
10
11 namespace ui {
12
13 // An abstraction of curve-based gesture motion, allowing platform-specific
14 // motion tailoring.
15 class EVENTS_BASE_EXPORT GestureCurve {
16 public:
17 virtual ~GestureCurve() {}
18
19 // The output |offset| represents the total movement of the curve from its
20 // start until |time|.
21 // The output |velocity| represents the instantenous velocity at |time|.
22 // Returns false if |time| exceeds the fling duration, in which case
23 // the terminal offset will be reported.
24 virtual bool ComputeScrollOffset(base::TimeTicks time,
25 gfx::Vector2dF* offset,
26 gfx::Vector2dF* velocity) = 0;
27 };
28
29 } // namespace ui
30
31 #endif // UI_EVENTS_GESTURE_CURVE_H_
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