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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.views;
import android.animation.ArgbEvaluator;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.support.v4.graphics.ColorUtils;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.HeaderViewListAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import com.android.launcher3.R;
import com.android.launcher3.util.Themes;
import java.util.ArrayList;
/**
* Extension of list view with support for element highlighting.
*/
public class HighlightableListView extends ListView {
private int mPosHighlight = -1;
private boolean mColorAnimated = false;
public HighlightableListView(Context context) {
super(context);
}
public HighlightableListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public HighlightableListView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
public void setAdapter(ListAdapter adapter) {
super.setAdapter(new HighLightAdapter(adapter));
}
public void highlightPosition(int pos) {
if (mPosHighlight == pos) {
return;
}
mColorAnimated = false;
mPosHighlight = pos;
setSelection(mPosHighlight);
int start = getFirstVisiblePosition();
int end = getLastVisiblePosition();
if (start <= mPosHighlight && mPosHighlight <= end) {
highlightView(getChildAt(mPosHighlight - start));
}
}
private void highlightView(View view) {
if (Boolean.TRUE.equals(view.getTag(R.id.view_highlighted))) {
// already highlighted
} else {
view.setTag(R.id.view_highlighted, true);
view.setTag(R.id.view_unhighlight_background, view.getBackground());
view.setBackground(getHighlightBackground());
view.postDelayed(() -> {
mPosHighlight = -1;
unhighlightView(view);
}, 15000L);
}
}
private void unhighlightView(View view) {
if (Boolean.TRUE.equals(view.getTag(R.id.view_highlighted))) {
Object background = view.getTag(R.id.view_unhighlight_background);
if (background instanceof Drawable) {
view.setBackground((Drawable) background);
}
view.setTag(R.id.view_unhighlight_background, null);
view.setTag(R.id.view_highlighted, false);
}
}
private class HighLightAdapter extends HeaderViewListAdapter {
public HighLightAdapter(ListAdapter adapter) {
super(new ArrayList<>(), new ArrayList<>(), adapter);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = super.getView(position, convertView, parent);
if (position == mPosHighlight) {
highlightView(view);
} else {
unhighlightView(view);
}
return view;
}
}
private ColorDrawable getHighlightBackground() {
int color = ColorUtils.setAlphaComponent(Themes.getColorAccent(getContext()), 26);
if (mColorAnimated) {
return new ColorDrawable(color);
}
mColorAnimated = true;
ColorDrawable bg = new ColorDrawable(Color.WHITE);
ObjectAnimator anim = ObjectAnimator.ofInt(bg, "color", Color.WHITE, color);
anim.setEvaluator(new ArgbEvaluator());
anim.setDuration(200L);
anim.setRepeatMode(ValueAnimator.REVERSE);
anim.setRepeatCount(4);
anim.start();
return bg;
}
}
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