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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.settings;
import static androidx.core.graphics.ColorUtils.setAlphaComponent;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.Property;
import android.view.View;
import com.android.launcher3.util.Themes;
import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.RecyclerView.ItemDecoration;
import androidx.recyclerview.widget.RecyclerView.State;
import androidx.recyclerview.widget.RecyclerView.ViewHolder;
/**
* Utility class for highlighting a preference
*/
public class PreferenceHighlighter extends ItemDecoration implements Runnable {
private static final Property<PreferenceHighlighter, Integer> HIGHLIGHT_COLOR =
new Property<PreferenceHighlighter, Integer>(Integer.TYPE, "highlightColor") {
@Override
public Integer get(PreferenceHighlighter highlighter) {
return highlighter.mHighlightColor;
}
@Override
public void set(PreferenceHighlighter highlighter, Integer value) {
highlighter.mHighlightColor = value;
highlighter.mRv.invalidateItemDecorations();
}
};
private static final long HIGHLIGHT_DURATION = 15000L;
private static final long HIGHLIGHT_FADE_OUT_DURATION = 500L;
private static final long HIGHLIGHT_FADE_IN_DURATION = 200L;
private static final int END_COLOR = setAlphaComponent(Color.WHITE, 0);
private final Paint mPaint = new Paint();
private final RecyclerView mRv;
private final int mIndex;
private boolean mHighLightStarted = false;
private int mHighlightColor = END_COLOR;
public PreferenceHighlighter(RecyclerView rv, int index) {
mRv = rv;
mIndex = index;
}
@Override
public void run() {
mRv.addItemDecoration(this);
mRv.smoothScrollToPosition(mIndex);
}
@Override
public void onDraw(Canvas c, RecyclerView parent, State state) {
ViewHolder holder = parent.findViewHolderForAdapterPosition(mIndex);
if (holder == null) {
return;
}
if (!mHighLightStarted && state.getRemainingScrollVertical() != 0) {
// Wait until scrolling stopped
return;
}
if (!mHighLightStarted) {
// Start highlight
int colorTo = setAlphaComponent(Themes.getColorAccent(mRv.getContext()), 66);
ObjectAnimator anim = ObjectAnimator.ofArgb(this, HIGHLIGHT_COLOR, END_COLOR, colorTo);
anim.setDuration(HIGHLIGHT_FADE_IN_DURATION);
anim.setRepeatMode(ValueAnimator.REVERSE);
anim.setRepeatCount(4);
anim.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
removeHighlight();
}
});
anim.start();
mHighLightStarted = true;
}
View view = holder.itemView;
mPaint.setColor(mHighlightColor);
c.drawRect(0, view.getY(), parent.getWidth(), view.getY() + view.getHeight(), mPaint);
}
private void removeHighlight() {
ObjectAnimator anim = ObjectAnimator.ofArgb(
this, HIGHLIGHT_COLOR, mHighlightColor, END_COLOR);
anim.setDuration(HIGHLIGHT_FADE_OUT_DURATION);
anim.setStartDelay(HIGHLIGHT_DURATION);
anim.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
mRv.removeItemDecoration(PreferenceHighlighter.this);
}
});
anim.start();
}
}
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