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/*
* Copyright (C) 2019 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.clock;
import android.view.View;
/**
* Controls transition to dark state by cross fading between views.
*/
final class CrossFadeDarkController {
private final View mFadeInView;
private final View mFadeOutView;
/**
* Creates a new controller that fades between views.
*
* @param fadeInView View to fade in when transitioning to AOD.
* @param fadeOutView View to fade out when transitioning to AOD.
*/
CrossFadeDarkController(View fadeInView, View fadeOutView) {
mFadeInView = fadeInView;
mFadeOutView = fadeOutView;
}
/**
* Sets the amount the system has transitioned to the dark state.
*
* @param darkAmount Amount of transition to dark state: 1f for AOD and 0f for lock screen.
*/
void setDarkAmount(float darkAmount) {
mFadeInView.setAlpha(Math.max(0f, 2f * darkAmount - 1f));
if (darkAmount == 0f) {
mFadeInView.setVisibility(View.GONE);
} else {
if (mFadeInView.getVisibility() == View.GONE) {
mFadeInView.setVisibility(View.VISIBLE);
}
}
mFadeOutView.setAlpha(Math.max(0f, 1f - 2f * darkAmount));
if (darkAmount == 1f) {
mFadeOutView.setVisibility(View.GONE);
} else {
if (mFadeOutView.getVisibility() == View.GONE) {
mFadeOutView.setVisibility(View.VISIBLE);
}
}
}
}
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