2017-11-14 08:30:56 +01:00
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/*
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* Copyright 2017 Martijn Brekhof. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.xbmc.kore.ui.behaviors;
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import android.content.Context;
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2020-04-15 22:46:06 +02:00
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import androidx.annotation.NonNull;
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import androidx.coordinatorlayout.widget.CoordinatorLayout;
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import androidx.core.view.ViewCompat;
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2017-11-14 08:30:56 +01:00
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import android.util.AttributeSet;
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import android.view.View;
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public class FadeOutOnVerticalScrollBehavior extends CoordinatorLayout.Behavior {
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private int maxScroll = 0;
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private int currentScroll;
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public FadeOutOnVerticalScrollBehavior(Context context, AttributeSet attrs) {
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super(context, attrs);
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}
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@Override
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public boolean onStartNestedScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull View child, @NonNull View directTargetChild, @NonNull View target, int axes, int type) {
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if ( axes == ViewCompat.SCROLL_AXIS_VERTICAL ) {
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if (maxScroll == 0)
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maxScroll = child.getHeight();
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return true;
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}
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return false;
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}
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@Override
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public void onNestedScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull View child, @NonNull View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed, int type) {
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currentScroll += dyConsumed;
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child.setAlpha((float) ((maxScroll - currentScroll) / (double) maxScroll));
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}
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}
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