1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package android.transition; 17 18 import com.android.internal.R; 19 20 import android.animation.Animator; 21 import android.animation.AnimatorListenerAdapter; 22 import android.animation.ObjectAnimator; 23 import android.animation.TimeInterpolator; 24 import android.graphics.Path; 25 import android.view.View; 26 27 /** 28 * This class is used by Slide and Explode to create an animator that goes from the start 29 * position to the end position. It takes into account the canceled position so that it 30 * will not blink out or shift suddenly when the transition is interrupted. 31 */ 32 class TranslationAnimationCreator { 33 34 /** 35 * Creates an animator that can be used for x and/or y translations. When interrupted, 36 * it sets a tag to keep track of the position so that it may be continued from position. 37 * 38 * @param view The view being moved. This may be in the overlay for onDisappear. 39 * @param values The values containing the view in the view hierarchy. 40 * @param viewPosX The x screen coordinate of view 41 * @param viewPosY The y screen coordinate of view 42 * @param startX The start translation x of view 43 * @param startY The start translation y of view 44 * @param endX The end translation x of view 45 * @param endY The end translation y of view 46 * @param interpolator The interpolator to use with this animator. 47 * @return An animator that moves from (startX, startY) to (endX, endY) unless there was 48 * a previous interruption, in which case it moves from the current position to (endX, endY). 49 */ 50 static Animator createAnimation(View view, TransitionValues values, int viewPosX, int viewPosY, 51 float startX, float startY, float endX, float endY, TimeInterpolator interpolator) { 52 float terminalX = view.getTranslationX(); 53 float terminalY = view.getTranslationY(); 54 int[] startPosition = (int[]) values.view.getTag(R.id.transitionPosition); 55 if (startPosition != null) { 56 startX = startPosition[0] - viewPosX + terminalX; 57 startY = startPosition[1] - viewPosY + terminalY; 58 } 59 // Initial position is at translation startX, startY, so position is offset by that amount 60 int startPosX = viewPosX + Math.round(startX - terminalX); 61 int startPosY = viewPosY + Math.round(startY - terminalY); 62 63 view.setTranslationX(startX); 64 view.setTranslationY(startY); 65 if (startX == endX && startY == endY) { 66 return null; 67 } 68 Path path = new Path(); 69 path.moveTo(startX, startY); 70 path.lineTo(endX, endY); 71 ObjectAnimator anim = ObjectAnimator.ofFloat(view, View.TRANSLATION_X, View.TRANSLATION_Y, 72 path); 73 74 TransitionPositionListener listener = new TransitionPositionListener(view, values.view, 75 startPosX, startPosY, terminalX, terminalY); 76 anim.addListener(listener); 77 anim.addPauseListener(listener); 78 anim.setInterpolator(interpolator); 79 return anim; 80 } 81 82 private static class TransitionPositionListener extends AnimatorListenerAdapter { 83 84 private final View mViewInHierarchy; 85 private final View mMovingView; 86 private final int mStartX; 87 private final int mStartY; 88 private int[] mTransitionPosition; 89 private float mPausedX; 90 private float mPausedY; 91 private final float mTerminalX; 92 private final float mTerminalY; 93 94 private TransitionPositionListener(View movingView, View viewInHierarchy, 95 int startX, int startY, float terminalX, float terminalY) { 96 mMovingView = movingView; 97 mViewInHierarchy = viewInHierarchy; 98 mStartX = startX - Math.round(mMovingView.getTranslationX()); 99 mStartY = startY - Math.round(mMovingView.getTranslationY()); 100 mTerminalX = terminalX; 101 mTerminalY = terminalY; 102 mTransitionPosition = (int[]) mViewInHierarchy.getTag(R.id.transitionPosition); 103 if (mTransitionPosition != null) { 104 mViewInHierarchy.setTagInternal(R.id.transitionPosition, null); 105 } 106 } 107 108 @Override 109 public void onAnimationCancel(Animator animation) { 110 if (mTransitionPosition == null) { 111 mTransitionPosition = new int[2]; 112 } 113 mTransitionPosition[0] = Math.round(mStartX + mMovingView.getTranslationX()); 114 mTransitionPosition[1] = Math.round(mStartY + mMovingView.getTranslationY()); 115 mViewInHierarchy.setTagInternal(R.id.transitionPosition, mTransitionPosition); 116 } 117 118 @Override 119 public void onAnimationEnd(Animator animator) { 120 mMovingView.setTranslationX(mTerminalX); 121 mMovingView.setTranslationY(mTerminalY); 122 } 123 124 @Override 125 public void onAnimationPause(Animator animator) { 126 mPausedX = mMovingView.getTranslationX(); 127 mPausedY = mMovingView.getTranslationY(); 128 mMovingView.setTranslationX(mTerminalX); 129 mMovingView.setTranslationY(mTerminalY); 130 } 131 132 @Override 133 public void onAnimationResume(Animator animator) { 134 mMovingView.setTranslationX(mPausedX); 135 mMovingView.setTranslationY(mPausedY); 136 } 137 } 138 139 } 140