18b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru/* 28b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * Copyright (C) 2009 The Android Open Source Project 38b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * 48b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * Licensed under the Apache License, Version 2.0 (the "License"); 58b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * you may not use this file except in compliance with the License. 68b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * You may obtain a copy of the License at 78b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * 88b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * http://www.apache.org/licenses/LICENSE-2.0 98b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * 108b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * Unless required by applicable law or agreed to in writing, software 118b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * distributed under the License is distributed on an "AS IS" BASIS, 128b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 138b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * See the License for the specific language governing permissions and 148b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * limitations under the License. 158b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru */ 168b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 178b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Querupackage android.view.animation; 188b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 198b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queruimport android.content.Context; 20e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghuiimport android.content.res.Resources; 218b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queruimport android.content.res.TypedArray; 22e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghuiimport android.content.res.Resources.Theme; 238b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queruimport android.util.AttributeSet; 248b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 25e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghuiimport com.android.internal.R; 26c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reckimport com.android.internal.view.animation.HasNativeInterpolator; 27c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reckimport com.android.internal.view.animation.NativeInterpolatorFactory; 28c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reckimport com.android.internal.view.animation.NativeInterpolatorFactoryHelper; 29c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reck 308b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru/** 318b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * An interpolator where the change starts backward then flings forward. 328b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru */ 33c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reck@HasNativeInterpolator 34d422dc358f0100106dc07d7b903201eb9b043b11Yigit Boyarpublic class AnticipateInterpolator extends BaseInterpolator implements NativeInterpolatorFactory { 358b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru private final float mTension; 368b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 378b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru public AnticipateInterpolator() { 388b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru mTension = 2.0f; 398b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru } 408b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 418b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru /** 428b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * @param tension Amount of anticipation. When tension equals 0.0f, there is 438b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * no anticipation and the interpolator becomes a simple 448b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * acceleration interpolator. 458b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru */ 468b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru public AnticipateInterpolator(float tension) { 478b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru mTension = tension; 488b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru } 498b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 508b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru public AnticipateInterpolator(Context context, AttributeSet attrs) { 51e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui this(context.getResources(), context.getTheme(), attrs); 52e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui } 53e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui 54e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui /** @hide */ 55e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui public AnticipateInterpolator(Resources res, Theme theme, AttributeSet attrs) { 56e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui TypedArray a; 57e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui if (theme != null) { 58e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui a = theme.obtainStyledAttributes(attrs, R.styleable.AnticipateInterpolator, 0, 0); 59e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui } else { 60e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui a = res.obtainAttributes(attrs, R.styleable.AnticipateInterpolator); 61e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui } 628b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 63d422dc358f0100106dc07d7b903201eb9b043b11Yigit Boyar mTension = a.getFloat(R.styleable.AnticipateInterpolator_tension, 2.0f); 64d422dc358f0100106dc07d7b903201eb9b043b11Yigit Boyar setChangingConfiguration(a.getChangingConfigurations()); 658b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru a.recycle(); 668b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru } 678b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 688b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru public float getInterpolation(float t) { 698b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru // a(t) = t * t * ((tension + 1) * t - tension) 708b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru return t * t * ((mTension + 1) * t - mTension); 718b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru } 72c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reck 73c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reck /** @hide */ 74c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reck @Override 75c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reck public long createNativeInterpolator() { 76c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reck return NativeInterpolatorFactoryHelper.createAnticipateInterpolator(mTension); 77c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reck } 788b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru} 79