1/*
2 * Copyright (C) 2010 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.gallery3d.app;
18
19import com.android.gallery3d.ui.GLView;
20
21import android.app.ActionBar;
22import android.app.Activity;
23import android.content.BroadcastReceiver;
24import android.content.Context;
25import android.content.Intent;
26import android.content.IntentFilter;
27import android.content.Intent;
28import android.content.res.Configuration;
29import android.os.BatteryManager;
30import android.os.Bundle;
31import android.view.Menu;
32import android.view.MenuItem;
33import android.view.View;
34import android.view.Window;
35import android.view.WindowManager;
36
37abstract public class ActivityState {
38    public static final int FLAG_HIDE_ACTION_BAR = 1;
39    public static final int FLAG_HIDE_STATUS_BAR = 2;
40    public static final int FLAG_SCREEN_ON = 3;
41
42    private static final int SCREEN_ON_FLAGS = (
43              WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
44            | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
45            | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
46        );
47
48    protected GalleryActivity mActivity;
49    protected Bundle mData;
50    protected int mFlags;
51
52    protected ResultEntry mReceivedResults;
53    protected ResultEntry mResult;
54
55    protected static class ResultEntry {
56        public int requestCode;
57        public int resultCode = Activity.RESULT_CANCELED;
58        public Intent resultData;
59        ResultEntry next;
60    }
61
62    private boolean mDestroyed = false;
63    private boolean mPlugged = false;
64
65    protected ActivityState() {
66    }
67
68    protected void setContentPane(GLView content) {
69        mActivity.getGLRoot().setContentPane(content);
70    }
71
72    void initialize(GalleryActivity activity, Bundle data) {
73        mActivity = activity;
74        mData = data;
75    }
76
77    public Bundle getData() {
78        return mData;
79    }
80
81    protected void onBackPressed() {
82        mActivity.getStateManager().finishState(this);
83    }
84
85    protected void setStateResult(int resultCode, Intent data) {
86        if (mResult == null) return;
87        mResult.resultCode = resultCode;
88        mResult.resultData = data;
89    }
90
91    protected void onConfigurationChanged(Configuration config) {
92    }
93
94    protected void onSaveState(Bundle outState) {
95    }
96
97    protected void onStateResult(int requestCode, int resultCode, Intent data) {
98    }
99
100    protected void onCreate(Bundle data, Bundle storedState) {
101    }
102
103    BroadcastReceiver mPowerIntentReceiver = new BroadcastReceiver() {
104        @Override
105        public void onReceive(Context context, Intent intent) {
106            final String action = intent.getAction();
107            if (Intent.ACTION_BATTERY_CHANGED.equals(action)) {
108                boolean plugged = (0 != intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0));
109
110                if (plugged != mPlugged) {
111                    mPlugged = plugged;
112                    final Window win = ((Activity) mActivity).getWindow();
113                    final WindowManager.LayoutParams params = win.getAttributes();
114                    setScreenOnFlags(params);
115                    win.setAttributes(params);
116                }
117            }
118        }
119    };
120
121    void setScreenOnFlags(WindowManager.LayoutParams params) {
122        if (mPlugged && 0 != (mFlags & FLAG_SCREEN_ON)) {
123            params.flags |= SCREEN_ON_FLAGS;
124        } else {
125            params.flags &= ~SCREEN_ON_FLAGS;
126        }
127    }
128
129    protected void onPause() {
130        if (0 != (mFlags & FLAG_SCREEN_ON)) {
131            ((Activity) mActivity).unregisterReceiver(mPowerIntentReceiver);
132        }
133    }
134
135    // should only be called by StateManager
136    void resume() {
137        Activity activity = (Activity) mActivity;
138        ActionBar actionBar = activity.getActionBar();
139        if (actionBar != null) {
140            if ((mFlags & FLAG_HIDE_ACTION_BAR) != 0) {
141                actionBar.hide();
142            } else {
143                actionBar.show();
144            }
145            int stateCount = mActivity.getStateManager().getStateCount();
146            actionBar.setDisplayOptions(
147                    stateCount == 1 ? 0 : ActionBar.DISPLAY_HOME_AS_UP,
148                    ActionBar.DISPLAY_HOME_AS_UP);
149            actionBar.setHomeButtonEnabled(true);
150        }
151
152        activity.invalidateOptionsMenu();
153
154        final Window win = activity.getWindow();
155        final WindowManager.LayoutParams params = win.getAttributes();
156
157        if ((mFlags & FLAG_HIDE_STATUS_BAR) != 0) {
158            params.systemUiVisibility = View.SYSTEM_UI_FLAG_LOW_PROFILE;
159        } else {
160            params.systemUiVisibility = View.SYSTEM_UI_FLAG_VISIBLE;
161        }
162
163        setScreenOnFlags(params);
164        win.setAttributes(params);
165
166        ResultEntry entry = mReceivedResults;
167        if (entry != null) {
168            mReceivedResults = null;
169            onStateResult(entry.requestCode, entry.resultCode, entry.resultData);
170        }
171
172        if (0 != (mFlags & FLAG_SCREEN_ON)) {
173            // we need to know whether the device is plugged in to do this correctly
174            final IntentFilter filter = new IntentFilter();
175            filter.addAction(Intent.ACTION_BATTERY_CHANGED);
176            activity.registerReceiver(mPowerIntentReceiver, filter);
177        }
178        onResume();
179    }
180
181    // a subclass of ActivityState should override the method to resume itself
182    protected void onResume() {
183    }
184
185    protected boolean onCreateActionBar(Menu menu) {
186        // TODO: we should return false if there is no menu to show
187        //       this is a workaround for a bug in system
188        return true;
189    }
190
191    protected boolean onItemSelected(MenuItem item) {
192        return false;
193    }
194
195    protected void onDestroy() {
196        mDestroyed = true;
197    }
198
199    boolean isDestroyed() {
200        return mDestroyed;
201    }
202}
203