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/*
* Copyright (C) 2018 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.launcher3.util;
import static com.android.launcher3.LauncherAnimUtils.VIEW_ALPHA;
import android.view.View;
import com.android.launcher3.anim.AlphaUpdateListener;
/**
* Utility class to handle separating a single value as a factor of multiple values
*/
public class MultiValueAlpha extends MultiPropertyFactory<View> {
private static final FloatBiFunction ALPHA_AGGREGATOR = (a, b) -> a * b;
// Whether we should change from INVISIBLE to VISIBLE and vice versa at low alpha values.
private boolean mUpdateVisibility;
private final int mHiddenVisibility;
public MultiValueAlpha(View view, int size) {
this(view, size, View.INVISIBLE);
}
public MultiValueAlpha(View view, int size, int hiddenVisibility) {
super(view, VIEW_ALPHA, size, ALPHA_AGGREGATOR, 1f);
this.mHiddenVisibility = hiddenVisibility;
}
/** Sets whether we should update between INVISIBLE and VISIBLE based on alpha. */
public void setUpdateVisibility(boolean updateVisibility) {
mUpdateVisibility = updateVisibility;
}
@Override
protected void apply(float value) {
super.apply(value);
if (mUpdateVisibility) {
AlphaUpdateListener.updateVisibility(mTarget, mHiddenVisibility);
}
}
}
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