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_ 52
