mirror of https://github.com/tasks/tasks
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
44 lines
1.9 KiB
Java
44 lines
1.9 KiB
Java
/*
|
|
* Copyright (C) 2010 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package com.actionbarsherlock.internal.nineoldandroids.animation;
|
|
|
|
/**
|
|
* Interface for use with the {@link ValueAnimator#setEvaluator(TypeEvaluator)} function. Evaluators
|
|
* allow developers to create animations on arbitrary property types, by allowing them to supply
|
|
* custom evaulators for types that are not automatically understood and used by the animation
|
|
* system.
|
|
*
|
|
* @see ValueAnimator#setEvaluator(TypeEvaluator)
|
|
*/
|
|
public interface TypeEvaluator<T> {
|
|
|
|
/**
|
|
* This function returns the result of linearly interpolating the start and end values, with
|
|
* <code>fraction</code> representing the proportion between the start and end values. The
|
|
* calculation is a simple parametric calculation: <code>result = x0 + t * (v1 - v0)</code>,
|
|
* where <code>x0</code> is <code>startValue</code>, <code>x1</code> is <code>endValue</code>,
|
|
* and <code>t</code> is <code>fraction</code>.
|
|
*
|
|
* @param fraction The fraction from the starting to the ending values
|
|
* @param startValue The start value.
|
|
* @param endValue The end value.
|
|
* @return A linear interpolation between the start and end values, given the
|
|
* <code>fraction</code> parameter.
|
|
*/
|
|
public T evaluate(float fraction, T startValue, T endValue);
|
|
|
|
} |