1/*
2 * Copyright (C) 2014 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 com.android.settings;
18
19import android.app.Fragment;
20import android.graphics.drawable.Drawable;
21import android.os.Bundle;
22import android.text.TextUtils;
23import android.view.View;
24import android.view.ViewGroup;
25
26public class HighlightingFragment extends Fragment {
27
28    private static final String TAG = "HighlightSettingsFragment";
29
30    private static final int DELAY_HIGHLIGHT_DURATION_MILLIS = 400;
31    private static final String SAVE_HIGHLIGHTED_KEY = "android:view_highlighted";
32
33    private String mViewKey;
34    private boolean mViewHighlighted = false;
35    private Drawable mHighlightDrawable;
36
37    @Override
38    public void onCreate(Bundle icicle) {
39        super.onCreate(icicle);
40
41        if (icicle != null) {
42            mViewHighlighted = icicle.getBoolean(SAVE_HIGHLIGHTED_KEY);
43        }
44    }
45
46    @Override
47    public void onSaveInstanceState(Bundle outState) {
48        super.onSaveInstanceState(outState);
49
50        outState.putBoolean(SAVE_HIGHLIGHTED_KEY, mViewHighlighted);
51    }
52
53    @Override
54    public void onActivityCreated(Bundle savedInstanceState) {
55        super.onActivityCreated(savedInstanceState);
56
57        final Bundle args = getArguments();
58        if (args != null) {
59            mViewKey = args.getString(SettingsActivity.EXTRA_FRAGMENT_ARG_KEY);
60            highlightViewIfNeeded();
61        }
62    }
63
64    public void highlightViewIfNeeded() {
65        if (!mViewHighlighted &&!TextUtils.isEmpty(mViewKey)) {
66            highlightView(mViewKey);
67        }
68    }
69
70    private Drawable getHighlightDrawable() {
71        if (mHighlightDrawable == null) {
72            mHighlightDrawable = getActivity().getDrawable(R.drawable.preference_highlight);
73        }
74        return mHighlightDrawable;
75    }
76
77    private void highlightView(String key) {
78        final Drawable highlight = getHighlightDrawable();
79
80        // Try locating the View thru its Tag / Key
81        final View view = findViewForKey(getView(), key);
82        if (view != null ) {
83            view.setBackground(highlight);
84
85            getView().postDelayed(new Runnable() {
86                @Override
87                public void run() {
88                    final int centerX = view.getWidth() / 2;
89                    final int centerY = view.getHeight() / 2;
90                    highlight.setHotspot(centerX, centerY);
91                    view.setPressed(true);
92                    view.setPressed(false);
93                }
94            }, DELAY_HIGHLIGHT_DURATION_MILLIS);
95
96            mViewHighlighted = true;
97        }
98    }
99
100    private View findViewForKey(View root, String key) {
101        if (checkTag(root, key)) {
102            return root;
103        }
104        if (root instanceof ViewGroup) {
105            final ViewGroup group = (ViewGroup) root;
106            final int count = group.getChildCount();
107            for (int n = 0; n < count; n++) {
108                final View child = group.getChildAt(n);
109                final View view = findViewForKey(child, key);
110                if (view != null) {
111                    return view;
112                }
113            }
114        }
115        return null;
116    }
117
118    private boolean checkTag(View view, String key) {
119        final Object tag = view.getTag(R.id.preference_highlight_key);
120        if (tag == null || !(tag instanceof String)) {
121            return false;
122        }
123        final String viewKey = (String) tag;
124        return (!TextUtils.isEmpty(viewKey) && viewKey.equals(key));
125    }
126}
127