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/*
* Copyright (C) 2014 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.keyguard;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.TimeInterpolator;
import android.content.Context;
import android.view.View;
import android.view.ViewPropertyAnimator;
import android.view.animation.AnimationUtils;
import android.view.animation.Interpolator;
/**
* A class to make nice appear transitions for views in a tabular layout.
*/
public class AppearAnimationUtils {
public static final long APPEAR_DURATION = 220;
private final Interpolator mLinearOutSlowIn;
private final float mStartTranslation;
public AppearAnimationUtils(Context ctx) {
mLinearOutSlowIn = AnimationUtils.loadInterpolator(
ctx, android.R.interpolator.linear_out_slow_in);
mStartTranslation =
ctx.getResources().getDimensionPixelOffset(R.dimen.appear_y_translation_start);
}
public void startAppearAnimation(View[][] views, final Runnable finishListener) {
long maxDelay = 0;
ViewPropertyAnimator maxDelayAnimator = null;
for (int row = 0; row < views.length; row++) {
View[] columns = views[row];
for (int col = 0; col < columns.length; col++) {
long delay = calculateDelay(row, col);
ViewPropertyAnimator animator = startAppearAnimation(columns[col], delay);
if (animator != null && delay > maxDelay) {
maxDelay = delay;
maxDelayAnimator = animator;
}
}
}
if (maxDelayAnimator != null) {
maxDelayAnimator.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
finishListener.run();
}
});
} else {
finishListener.run();
}
}
private ViewPropertyAnimator startAppearAnimation(View view, long delay) {
if (view == null) return null;
view.setAlpha(0f);
view.setTranslationY(mStartTranslation);
view.animate()
.alpha(1f)
.translationY(0)
.setInterpolator(mLinearOutSlowIn)
.setDuration(APPEAR_DURATION)
.setStartDelay(delay)
.setListener(null);
if (view.hasOverlappingRendering()) {
view.animate().withLayer();
}
return view.animate();
}
private long calculateDelay(int row, int col) {
return (long) (row * 40 + col * (Math.pow(row, 0.4) + 0.4) * 20);
}
public TimeInterpolator getInterpolator() {
return mLinearOutSlowIn;
}
public float getStartTranslation() {
return mStartTranslation;
}
}
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