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/*
* Copyright (C) 2017 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.android.tv.common.ui.setup.animation;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.animation.TimeInterpolator;
import android.graphics.Path;
import android.support.v17.leanback.R;
import android.transition.Transition;
import android.transition.TransitionValues;
import android.view.View;
/**
* This class is used by Slide and Explode to create an animator that goes from the start position
* to the end position. It takes into account the canceled position so that it will not blink out or
* shift suddenly when the transition is interrupted. The original class is
* android.support.v17.leanback.transition.TranslationAnimationCreator which is hidden.
*/
// Copied from android.support.v17.leanback.transition.TransltaionAnimationCreator
class TranslationAnimationCreator {
/**
* Creates an animator that can be used for x and/or y translations. When interrupted, it sets a
* tag to keep track of the position so that it may be continued from position.
*
* @param view The view being moved. This may be in the overlay for onDisappear.
* @param values The values containing the view in the view hierarchy.
* @param viewPosX The x screen coordinate of view
* @param startX The start translation x of view
* @param endX The end translation x of view
* @param interpolator The interpolator to use with this animator.
* @return An animator that moves from (startX, startY) to (endX, endY) unless there was a
* previous interruption, in which case it moves from the current position to (endX, endY).
*/
static Animator createAnimation(
View view,
TransitionValues values,
int viewPosX,
float startX,
float endX,
TimeInterpolator interpolator,
Transition transition) {
float terminalX = view.getTranslationX();
Integer startPosition = (Integer) values.view.getTag(R.id.transitionPosition);
if (startPosition != null) {
startX = startPosition - viewPosX + terminalX;
}
// Initial position is at translation startX, startY, so position is offset by that
// amount
int startPosX = viewPosX + Math.round(startX - terminalX);
view.setTranslationX(startX);
if (startX == endX) {
return null;
}
Path path = new Path();
path.moveTo(startX, 0);
path.lineTo(endX, 0);
ObjectAnimator anim =
ObjectAnimator.ofFloat(view, View.TRANSLATION_X, View.TRANSLATION_Y, path);
TransitionPositionListener listener =
new TransitionPositionListener(view, values.view, startPosX, terminalX);
transition.addListener(listener);
anim.addListener(listener);
anim.addPauseListener(listener);
anim.setInterpolator(interpolator);
return anim;
}
private static class TransitionPositionListener extends AnimatorListenerAdapter
implements Transition.TransitionListener {
private final View mViewInHierarchy;
private final View mMovingView;
private final int mStartX;
private Integer mTransitionPosition;
private float mPausedX;
private final float mTerminalX;
private TransitionPositionListener(
View movingView, View viewInHierarchy, int startX, float terminalX) {
mMovingView = movingView;
mViewInHierarchy = viewInHierarchy;
mStartX = startX - Math.round(mMovingView.getTranslationX());
mTerminalX = terminalX;
mTransitionPosition = (Integer) mViewInHierarchy.getTag(R.id.transitionPosition);
if (mTransitionPosition != null) {
mViewInHierarchy.setTag(R.id.transitionPosition, null);
}
}
@Override
public void onAnimationCancel(Animator animation) {
mTransitionPosition = Math.round(mStartX + mMovingView.getTranslationX());
mViewInHierarchy.setTag(R.id.transitionPosition, mTransitionPosition);
}
@Override
public void onAnimationEnd(Animator animator) {}
@Override
public void onAnimationPause(Animator animator) {
mPausedX = mMovingView.getTranslationX();
mMovingView.setTranslationX(mTerminalX);
}
@Override
public void onAnimationResume(Animator animator) {
mMovingView.setTranslationX(mPausedX);
}
@Override
public void onTransitionStart(Transition transition) {}
@Override
public void onTransitionEnd(Transition transition) {
mMovingView.setTranslationX(mTerminalX);
}
@Override
public void onTransitionCancel(Transition transition) {}
@Override
public void onTransitionPause(Transition transition) {}
@Override
public void onTransitionResume(Transition transition) {}
}
}
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