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| 1 // Copyright (c) 2012 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_BASE_ANIMATION_TWEEN_H_ | |
| 6 #define UI_BASE_ANIMATION_TWEEN_H_ | |
| 7 | |
| 8 #include "base/basictypes.h" | |
| 9 #include "ui/base/ui_export.h" | |
| 10 #include "ui/gfx/rect.h" | |
| 11 #include "ui/gfx/transform.h" | |
| 12 | |
| 13 namespace ui { | |
| 14 | |
| 15 class UI_EXPORT Tween { | |
| 16 public: | |
| 17 enum Type { | |
| 18 LINEAR, // Linear. | |
| 19 EASE_OUT, // Fast in, slow out (default). | |
| 20 EASE_IN, // Slow in, fast out. | |
| 21 EASE_IN_2, // Variant of EASE_IN that starts out slower. | |
| 22 EASE_IN_OUT, // Slow in and out, fast in the middle. | |
| 23 FAST_IN_OUT, // Fast in and out, slow in the middle. | |
| 24 EASE_OUT_SNAP, // Fast in, slow out, snap to final value. | |
| 25 SMOOTH_IN_OUT, // Smooth, consistent speeds in and out (sine wave). | |
| 26 ZERO, // Returns a value of 0 always. | |
| 27 }; | |
| 28 | |
| 29 // Returns the value based on the tween type. |state| is from 0-1. | |
| 30 static double CalculateValue(Type type, double state); | |
| 31 | |
| 32 // Conveniences for getting a value between a start and end point. | |
| 33 static double ValueBetween(double value, double start, double target); | |
| 34 static int ValueBetween(double value, int start, int target); | |
| 35 static gfx::Rect ValueBetween(double value, | |
| 36 const gfx::Rect& start_bounds, | |
| 37 const gfx::Rect& target_bounds); | |
| 38 static gfx::Transform ValueBetween(double value, | |
| 39 const gfx::Transform& start_transform, | |
| 40 const gfx::Transform& target_transform); | |
| 41 | |
| 42 private: | |
| 43 Tween(); | |
| 44 ~Tween(); | |
| 45 | |
| 46 DISALLOW_COPY_AND_ASSIGN(Tween); | |
| 47 }; | |
| 48 | |
| 49 } // namespace ui | |
| 50 | |
| 51 #endif // UI_BASE_ANIMATION_TWEEN_H_ | |
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