1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
/*
* 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 android.animation.ArgbEvaluator;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.view.View.OnLayoutChangeListener;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.AbsListView.RecyclerListener;
import android.widget.ListView;
import com.android.launcher3.R;
import androidx.core.graphics.ColorUtils;
/**
* Utility class to scroll and highlight a list view item
*/
public class ListViewHighlighter implements OnScrollListener, RecyclerListener,
OnLayoutChangeListener {
private final ListView mListView;
private int mPosHighlight;
private boolean mColorAnimated = false;
public ListViewHighlighter(ListView listView, int posHighlight) {
mListView = listView;
mPosHighlight = posHighlight;
mListView.setOnScrollListener(this);
mListView.setRecyclerListener(this);
mListView.addOnLayoutChangeListener(this);
mListView.post(this::tryHighlight);
}
@Override
public void onLayoutChange(View v, int left, int top, int right, int bottom,
int oldLeft, int oldTop, int oldRight, int oldBottom) {
mListView.post(this::tryHighlight);
}
private void tryHighlight() {
if (mPosHighlight < 0 || mListView.getChildCount() == 0) {
return;
}
if (!highlightIfVisible(mListView.getFirstVisiblePosition(),
mListView.getLastVisiblePosition())) {
mListView.smoothScrollToPosition(mPosHighlight);
}
}
@Override
public void onScrollStateChanged(AbsListView absListView, int i) { }
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
highlightIfVisible(firstVisibleItem, firstVisibleItem + visibleItemCount - 1);
}
private boolean highlightIfVisible(int start, int end) {
if (mPosHighlight < 0 || mListView.getChildCount() == 0) {
return false;
}
if (start > mPosHighlight || mPosHighlight > end) {
return false;
}
highlightView(mListView.getChildAt(mPosHighlight - start));
// finish highlight
mListView.setOnScrollListener(null);
mListView.removeOnLayoutChangeListener(this);
mPosHighlight = -1;
return true;
}
@Override
public void onMovedToScrapHeap(View view) {
unhighlightView(view);
}
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(() -> {
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 ColorDrawable getHighlightBackground() {
int color = ColorUtils.setAlphaComponent(Themes.getColorAccent(mListView.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;
}
}
|
