1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.support.v7.app;
18
19import android.content.Context;
20import android.graphics.Bitmap;
21import android.graphics.Canvas;
22import android.graphics.Rect;
23import android.graphics.drawable.BitmapDrawable;
24import android.support.v7.mediarouter.R;
25import android.util.DisplayMetrics;
26import android.util.TypedValue;
27import android.view.View;
28import android.view.ViewGroup;
29import android.widget.ArrayAdapter;
30import android.widget.ListView;
31
32import java.util.HashMap;
33import java.util.HashSet;
34import java.util.List;
35import java.util.Set;
36
37final class MediaRouteDialogHelper {
38    /**
39     * The framework should set the dialog width properly, but somehow it doesn't work, hence
40     * duplicating a similar logic here to determine the appropriate dialog width.
41     */
42    public static int getDialogWidth(Context context) {
43        DisplayMetrics metrics = context.getResources().getDisplayMetrics();
44        boolean isPortrait = metrics.widthPixels < metrics.heightPixels;
45
46        TypedValue value = new TypedValue();
47        context.getResources().getValue(isPortrait ? R.dimen.mr_dialog_fixed_width_minor
48                : R.dimen.mr_dialog_fixed_width_major, value, true);
49        if (value.type == TypedValue.TYPE_DIMENSION) {
50            return (int) value.getDimension(metrics);
51        } else if (value.type == TypedValue.TYPE_FRACTION) {
52            return (int) value.getFraction(metrics.widthPixels, metrics.widthPixels);
53        }
54        return ViewGroup.LayoutParams.WRAP_CONTENT;
55    }
56
57    /**
58     * Compares two lists regardless of order.
59     *
60     * @param list1 A list
61     * @param list2 A list to be compared with {@code list1}
62     * @return True if two lists have exactly same items regardless of order, false otherwise.
63     */
64    public static <E> boolean listUnorderedEquals(List<E> list1, List<E> list2) {
65        HashSet<E> set1 = new HashSet<>(list1);
66        HashSet<E> set2 = new HashSet<>(list2);
67        return set1.equals(set2);
68    }
69
70    /**
71     * Compares two lists and returns a set of items which exist
72     * after-list but before-list, which means newly added items.
73     *
74     * @param before A list
75     * @param after A list to be compared with {@code before}
76     * @return A set of items which contains newly added items while
77     * comparing {@code after} to {@code before}.
78     */
79    public static <E> Set<E> getItemsAdded(List<E> before, List<E> after) {
80        HashSet<E> set = new HashSet<>(after);
81        set.removeAll(before);
82        return set;
83    }
84
85    /**
86     * Compares two lists and returns a set of items which exist
87     * before-list but after-list, which means removed items.
88     *
89     * @param before A list
90     * @param after A list to be compared with {@code before}
91     * @return A set of items which contains removed items while
92     * comparing {@code after} to {@code before}.
93     */
94    public static <E> Set<E> getItemsRemoved(List<E> before, List<E> after) {
95        HashSet<E> set = new HashSet<>(before);
96        set.removeAll(after);
97        return set;
98    }
99
100    /**
101     * Generates an item-Rect map which indicates where member
102     * items are located in the given ListView.
103     *
104     * @param listView A list view
105     * @param adapter An array adapter which contains an array of items.
106     * @return A map of items and bounds of their views located in the given list view.
107     */
108    public static <E> HashMap<E, Rect> getItemBoundMap(ListView listView,
109            ArrayAdapter<E> adapter) {
110        HashMap<E, Rect> itemBoundMap = new HashMap<>();
111        int firstVisiblePosition = listView.getFirstVisiblePosition();
112        for (int i = 0; i < listView.getChildCount(); ++i) {
113            int position = firstVisiblePosition + i;
114            E item = adapter.getItem(position);
115            View view = listView.getChildAt(i);
116            itemBoundMap.put(item,
117                    new Rect(view.getLeft(), view.getTop(), view.getRight(), view.getBottom()));
118        }
119        return itemBoundMap;
120    }
121
122    /**
123     * Generates an item-BitmapDrawable map which stores snapshots
124     * of member items in the given ListView.
125     *
126     * @param context A context
127     * @param listView A list view
128     * @param adapter An array adapter which contains an array of items.
129     * @return A map of items and snapshots of their views in the given list view.
130     */
131    public static <E> HashMap<E, BitmapDrawable> getItemBitmapMap(Context context,
132            ListView listView, ArrayAdapter<E> adapter) {
133        HashMap<E, BitmapDrawable> itemBitmapMap = new HashMap<>();
134        int firstVisiblePosition = listView.getFirstVisiblePosition();
135        for (int i = 0; i < listView.getChildCount(); ++i) {
136            int position = firstVisiblePosition + i;
137            E item = adapter.getItem(position);
138            View view = listView.getChildAt(i);
139            itemBitmapMap.put(item, getViewBitmap(context, view));
140        }
141        return itemBitmapMap;
142    }
143
144    private static BitmapDrawable getViewBitmap(Context context, View view) {
145        Bitmap bitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(),
146                Bitmap.Config.ARGB_8888);
147        Canvas canvas = new Canvas(bitmap);
148        view.draw(canvas);
149        return new BitmapDrawable(context.getResources(), bitmap);
150    }
151}
152