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 android.animation.Animator;
19 import android.animation.AnimatorListenerAdapter;
20 import android.animation.ObjectAnimator;
21 import android.animation.TimeInterpolator;
22 import android.graphics.Path;
23 import android.transition.Transition.TransitionListener;
24 import android.view.View;
25 
26 import com.android.internal.R;
27 
28 /**
29  * This class is used by Slide and Explode to create an animator that goes from the start
30  * position to the end position. It takes into account the canceled position so that it
31  * will not blink out or shift suddenly when the transition is interrupted.
32  */
33 class TranslationAnimationCreator {
34 
35     /**
36      * Creates an animator that can be used for x and/or y translations. When interrupted,
37      * it sets a tag to keep track of the position so that it may be continued from position.
38      *
39      * @param view The view being moved. This may be in the overlay for onDisappear.
40      * @param values The values containing the view in the view hierarchy.
41      * @param viewPosX The x screen coordinate of view
42      * @param viewPosY The y screen coordinate of view
43      * @param startX The start translation x of view
44      * @param startY The start translation y of view
45      * @param endX The end translation x of view
46      * @param endY The end translation y of view
47      * @param interpolator The interpolator to use with this animator.
48      * @return An animator that moves from (startX, startY) to (endX, endY) unless there was
49      * a previous interruption, in which case it moves from the current position to (endX, endY).
50      */
createAnimation(View view, TransitionValues values, int viewPosX, int viewPosY, float startX, float startY, float endX, float endY, TimeInterpolator interpolator, Transition transition)51     static Animator createAnimation(View view, TransitionValues values, int viewPosX, int viewPosY,
52             float startX, float startY, float endX, float endY, TimeInterpolator interpolator,
53             Transition transition) {
54         float terminalX = view.getTranslationX();
55         float terminalY = view.getTranslationY();
56         int[] startPosition = (int[]) values.view.getTag(R.id.transitionPosition);
57         if (startPosition != null) {
58             startX = startPosition[0] - viewPosX + terminalX;
59             startY = startPosition[1] - viewPosY + terminalY;
60         }
61         // Initial position is at translation startX, startY, so position is offset by that amount
62         int startPosX = viewPosX + Math.round(startX - terminalX);
63         int startPosY = viewPosY + Math.round(startY - terminalY);
64 
65         view.setTranslationX(startX);
66         view.setTranslationY(startY);
67         if (startX == endX && startY == endY) {
68             return null;
69         }
70         Path path = new Path();
71         path.moveTo(startX, startY);
72         path.lineTo(endX, endY);
73         ObjectAnimator anim = ObjectAnimator.ofFloat(view, View.TRANSLATION_X, View.TRANSLATION_Y,
74                 path);
75 
76         TransitionPositionListener listener = new TransitionPositionListener(view, values.view,
77                 startPosX, startPosY, terminalX, terminalY);
78         transition.addListener(listener);
79         anim.addListener(listener);
80         anim.addPauseListener(listener);
81         anim.setInterpolator(interpolator);
82         return anim;
83     }
84 
85     private static class TransitionPositionListener extends AnimatorListenerAdapter implements
86             TransitionListener {
87 
88         private final View mViewInHierarchy;
89         private final View mMovingView;
90         private final int mStartX;
91         private final int mStartY;
92         private int[] mTransitionPosition;
93         private float mPausedX;
94         private float mPausedY;
95         private final float mTerminalX;
96         private final float mTerminalY;
97 
TransitionPositionListener(View movingView, View viewInHierarchy, int startX, int startY, float terminalX, float terminalY)98         private TransitionPositionListener(View movingView, View viewInHierarchy,
99                 int startX, int startY, float terminalX, float terminalY) {
100             mMovingView = movingView;
101             mViewInHierarchy = viewInHierarchy;
102             mStartX = startX - Math.round(mMovingView.getTranslationX());
103             mStartY = startY - Math.round(mMovingView.getTranslationY());
104             mTerminalX = terminalX;
105             mTerminalY = terminalY;
106             mTransitionPosition = (int[]) mViewInHierarchy.getTag(R.id.transitionPosition);
107             if (mTransitionPosition != null) {
108                 mViewInHierarchy.setTagInternal(R.id.transitionPosition, null);
109             }
110         }
111 
112         @Override
onAnimationCancel(Animator animation)113         public void onAnimationCancel(Animator animation) {
114             if (mTransitionPosition == null) {
115                 mTransitionPosition = new int[2];
116             }
117             mTransitionPosition[0] = Math.round(mStartX + mMovingView.getTranslationX());
118             mTransitionPosition[1] = Math.round(mStartY + mMovingView.getTranslationY());
119             mViewInHierarchy.setTagInternal(R.id.transitionPosition, mTransitionPosition);
120         }
121 
122         @Override
onAnimationEnd(Animator animator)123         public void onAnimationEnd(Animator animator) {
124         }
125 
126         @Override
onAnimationPause(Animator animator)127         public void onAnimationPause(Animator animator) {
128             mPausedX = mMovingView.getTranslationX();
129             mPausedY = mMovingView.getTranslationY();
130             mMovingView.setTranslationX(mTerminalX);
131             mMovingView.setTranslationY(mTerminalY);
132         }
133 
134         @Override
onAnimationResume(Animator animator)135         public void onAnimationResume(Animator animator) {
136             mMovingView.setTranslationX(mPausedX);
137             mMovingView.setTranslationY(mPausedY);
138         }
139 
140         @Override
onTransitionStart(Transition transition)141         public void onTransitionStart(Transition transition) {
142         }
143 
144         @Override
onTransitionEnd(Transition transition)145         public void onTransitionEnd(Transition transition) {
146             mMovingView.setTranslationX(mTerminalX);
147             mMovingView.setTranslationY(mTerminalY);
148             transition.removeListener(this);
149         }
150 
151         @Override
onTransitionCancel(Transition transition)152         public void onTransitionCancel(Transition transition) {
153         }
154 
155         @Override
onTransitionPause(Transition transition)156         public void onTransitionPause(Transition transition) {
157         }
158 
159         @Override
onTransitionResume(Transition transition)160         public void onTransitionResume(Transition transition) {
161         }
162     }
163 
164 }
165