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// Copyright (c) 2012 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 UI_BASE_ANIMATION_TWEEN_H_
#define UI_BASE_ANIMATION_TWEEN_H_
#include "base/basictypes.h"
#include "ui/base/ui_export.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/transform.h"
namespace ui {
class UI_EXPORT Tween {
public:
enum Type {
LINEAR, // Linear.
EASE_OUT, // Fast in, slow out (default).
EASE_IN, // Slow in, fast out.
EASE_IN_2, // Variant of EASE_IN that starts out slower.
EASE_IN_OUT, // Slow in and out, fast in the middle.
FAST_IN_OUT, // Fast in and out, slow in the middle.
EASE_OUT_SNAP, // Fast in, slow out, snap to final value.
SMOOTH_IN_OUT, // Smooth, consistent speeds in and out (sine wave).
ZERO, // Returns a value of 0 always.
};
// Returns the value based on the tween type. |state| is from 0-1.
static double CalculateValue(Type type, double state);
// Conveniences for getting a value between a start and end point.
static double ValueBetween(double value, double start, double target);
static int ValueBetween(double value, int start, int target);
static gfx::Rect ValueBetween(double value,
const gfx::Rect& start_bounds,
const gfx::Rect& target_bounds);
static gfx::Transform ValueBetween(double value,
const gfx::Transform& start_transform,
const gfx::Transform& target_transform);
private:
Tween();
~Tween();
DISALLOW_COPY_AND_ASSIGN(Tween);
};
} // namespace ui
#endif // UI_BASE_ANIMATION_TWEEN_H_
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