1/*
2 * Copyright (C) 2013 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.internal.app;
18
19import com.android.internal.R;
20
21import android.app.Dialog;
22import android.content.Context;
23import android.media.MediaRouter;
24import android.media.MediaRouter.RouteInfo;
25import android.os.Bundle;
26import android.text.TextUtils;
27import android.util.TypedValue;
28import android.view.LayoutInflater;
29import android.view.View;
30import android.view.ViewGroup;
31import android.view.Window;
32import android.widget.AdapterView;
33import android.widget.ArrayAdapter;
34import android.widget.Button;
35import android.widget.ListView;
36import android.widget.TextView;
37
38import java.util.Comparator;
39
40/**
41 * This class implements the route chooser dialog for {@link MediaRouter}.
42 * <p>
43 * This dialog allows the user to choose a route that matches a given selector.
44 * </p>
45 *
46 * @see MediaRouteButton
47 * @see MediaRouteActionProvider
48 *
49 * TODO: Move this back into the API, as in the support library media router.
50 */
51public class MediaRouteChooserDialog extends Dialog {
52    private final MediaRouter mRouter;
53    private final MediaRouterCallback mCallback;
54
55    private int mRouteTypes;
56    private View.OnClickListener mExtendedSettingsClickListener;
57    private RouteAdapter mAdapter;
58    private ListView mListView;
59    private Button mExtendedSettingsButton;
60    private boolean mAttachedToWindow;
61
62    public MediaRouteChooserDialog(Context context, int theme) {
63        super(context, theme);
64
65        mRouter = (MediaRouter) context.getSystemService(Context.MEDIA_ROUTER_SERVICE);
66        mCallback = new MediaRouterCallback();
67    }
68
69    /**
70     * Gets the media route types for filtering the routes that the user can
71     * select using the media route chooser dialog.
72     *
73     * @return The route types.
74     */
75    public int getRouteTypes() {
76        return mRouteTypes;
77    }
78
79    /**
80     * Sets the types of routes that will be shown in the media route chooser dialog
81     * launched by this button.
82     *
83     * @param types The route types to match.
84     */
85    public void setRouteTypes(int types) {
86        if (mRouteTypes != types) {
87            mRouteTypes = types;
88
89            if (mAttachedToWindow) {
90                mRouter.removeCallback(mCallback);
91                mRouter.addCallback(types, mCallback,
92                        MediaRouter.CALLBACK_FLAG_PERFORM_ACTIVE_SCAN);
93            }
94
95            refreshRoutes();
96        }
97    }
98
99    public void setExtendedSettingsClickListener(View.OnClickListener listener) {
100        if (listener != mExtendedSettingsClickListener) {
101            mExtendedSettingsClickListener = listener;
102            updateExtendedSettingsButton();
103        }
104    }
105
106    /**
107     * Returns true if the route should be included in the list.
108     * <p>
109     * The default implementation returns true for enabled non-default routes that
110     * match the route types.  Subclasses can override this method to filter routes
111     * differently.
112     * </p>
113     *
114     * @param route The route to consider, never null.
115     * @return True if the route should be included in the chooser dialog.
116     */
117    public boolean onFilterRoute(MediaRouter.RouteInfo route) {
118        return !route.isDefault() && route.isEnabled() && route.matchesTypes(mRouteTypes);
119    }
120
121    @Override
122    protected void onCreate(Bundle savedInstanceState) {
123        super.onCreate(savedInstanceState);
124
125        getWindow().requestFeature(Window.FEATURE_LEFT_ICON);
126
127        setContentView(R.layout.media_route_chooser_dialog);
128        setTitle(mRouteTypes == MediaRouter.ROUTE_TYPE_REMOTE_DISPLAY
129                ? R.string.media_route_chooser_title_for_remote_display
130                : R.string.media_route_chooser_title);
131
132        // Must be called after setContentView.
133        getWindow().setFeatureDrawableResource(Window.FEATURE_LEFT_ICON,
134                isLightTheme(getContext()) ? R.drawable.ic_media_route_off_holo_light
135                    : R.drawable.ic_media_route_off_holo_dark);
136
137        mAdapter = new RouteAdapter(getContext());
138        mListView = (ListView)findViewById(R.id.media_route_list);
139        mListView.setAdapter(mAdapter);
140        mListView.setOnItemClickListener(mAdapter);
141        mListView.setEmptyView(findViewById(android.R.id.empty));
142
143        mExtendedSettingsButton = (Button)findViewById(R.id.media_route_extended_settings_button);
144        updateExtendedSettingsButton();
145    }
146
147    private void updateExtendedSettingsButton() {
148        if (mExtendedSettingsButton != null) {
149            mExtendedSettingsButton.setOnClickListener(mExtendedSettingsClickListener);
150            mExtendedSettingsButton.setVisibility(
151                    mExtendedSettingsClickListener != null ? View.VISIBLE : View.GONE);
152        }
153    }
154
155    @Override
156    public void onAttachedToWindow() {
157        super.onAttachedToWindow();
158
159        mAttachedToWindow = true;
160        mRouter.addCallback(mRouteTypes, mCallback, MediaRouter.CALLBACK_FLAG_PERFORM_ACTIVE_SCAN);
161        refreshRoutes();
162    }
163
164    @Override
165    public void onDetachedFromWindow() {
166        mAttachedToWindow = false;
167        mRouter.removeCallback(mCallback);
168
169        super.onDetachedFromWindow();
170    }
171
172    /**
173     * Refreshes the list of routes that are shown in the chooser dialog.
174     */
175    public void refreshRoutes() {
176        if (mAttachedToWindow) {
177            mAdapter.update();
178        }
179    }
180
181    static boolean isLightTheme(Context context) {
182        TypedValue value = new TypedValue();
183        return context.getTheme().resolveAttribute(R.attr.isLightTheme, value, true)
184                && value.data != 0;
185    }
186
187    private final class RouteAdapter extends ArrayAdapter<MediaRouter.RouteInfo>
188            implements ListView.OnItemClickListener {
189        private final LayoutInflater mInflater;
190
191        public RouteAdapter(Context context) {
192            super(context, 0);
193            mInflater = LayoutInflater.from(context);
194        }
195
196        public void update() {
197            clear();
198            final int count = mRouter.getRouteCount();
199            for (int i = 0; i < count; i++) {
200                MediaRouter.RouteInfo route = mRouter.getRouteAt(i);
201                if (onFilterRoute(route)) {
202                    add(route);
203                }
204            }
205            sort(RouteComparator.sInstance);
206            notifyDataSetChanged();
207        }
208
209        @Override
210        public boolean areAllItemsEnabled() {
211            return false;
212        }
213
214        @Override
215        public boolean isEnabled(int position) {
216            return getItem(position).isEnabled();
217        }
218
219        @Override
220        public View getView(int position, View convertView, ViewGroup parent) {
221            View view = convertView;
222            if (view == null) {
223                view = mInflater.inflate(R.layout.media_route_list_item, parent, false);
224            }
225            MediaRouter.RouteInfo route = getItem(position);
226            TextView text1 = (TextView)view.findViewById(android.R.id.text1);
227            TextView text2 = (TextView)view.findViewById(android.R.id.text2);
228            text1.setText(route.getName());
229            CharSequence description = route.getDescription();
230            if (TextUtils.isEmpty(description)) {
231                text2.setVisibility(View.GONE);
232                text2.setText("");
233            } else {
234                text2.setVisibility(View.VISIBLE);
235                text2.setText(description);
236            }
237            view.setEnabled(route.isEnabled());
238            return view;
239        }
240
241        @Override
242        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
243            MediaRouter.RouteInfo route = getItem(position);
244            if (route.isEnabled()) {
245                route.select();
246                dismiss();
247            }
248        }
249    }
250
251    private final class MediaRouterCallback extends MediaRouter.SimpleCallback {
252        @Override
253        public void onRouteAdded(MediaRouter router, MediaRouter.RouteInfo info) {
254            refreshRoutes();
255        }
256
257        @Override
258        public void onRouteRemoved(MediaRouter router, MediaRouter.RouteInfo info) {
259            refreshRoutes();
260        }
261
262        @Override
263        public void onRouteChanged(MediaRouter router, MediaRouter.RouteInfo info) {
264            refreshRoutes();
265        }
266
267        @Override
268        public void onRouteSelected(MediaRouter router, int type, RouteInfo info) {
269            dismiss();
270        }
271    }
272
273    private static final class RouteComparator implements Comparator<MediaRouter.RouteInfo> {
274        public static final RouteComparator sInstance = new RouteComparator();
275
276        @Override
277        public int compare(MediaRouter.RouteInfo lhs, MediaRouter.RouteInfo rhs) {
278            return lhs.getName().toString().compareTo(rhs.getName().toString());
279        }
280    }
281}
282