1/*
2 * Copyright (C) 2011 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 */
16package com.android.browser;
17
18import android.app.ActionBar;
19import android.app.Activity;
20import android.app.Fragment;
21import android.app.FragmentTransaction;
22import android.content.Context;
23import android.content.Intent;
24import android.net.Uri;
25import android.os.Bundle;
26import android.support.v13.app.FragmentPagerAdapter;
27import android.support.v4.view.ViewPager;
28import android.view.Menu;
29import android.view.MenuItem;
30
31import com.android.browser.UI.ComboViews;
32
33import java.util.ArrayList;
34
35public class ComboViewActivity extends Activity implements CombinedBookmarksCallbacks {
36
37    private static final String STATE_SELECTED_TAB = "tab";
38    public static final String EXTRA_COMBO_ARGS = "combo_args";
39    public static final String EXTRA_INITIAL_VIEW = "initial_view";
40
41    public static final String EXTRA_OPEN_SNAPSHOT = "snapshot_id";
42    public static final String EXTRA_OPEN_ALL = "open_all";
43    public static final String EXTRA_CURRENT_URL = "url";
44    private ViewPager mViewPager;
45    private TabsAdapter mTabsAdapter;
46
47    @Override
48    protected void onCreate(Bundle savedInstanceState) {
49        super.onCreate(savedInstanceState);
50        setResult(RESULT_CANCELED);
51        Bundle extras = getIntent().getExtras();
52        Bundle args = extras.getBundle(EXTRA_COMBO_ARGS);
53        String svStr = extras.getString(EXTRA_INITIAL_VIEW, null);
54        ComboViews startingView = svStr != null
55                ? ComboViews.valueOf(svStr)
56                : ComboViews.Bookmarks;
57        mViewPager = new ViewPager(this);
58        mViewPager.setId(R.id.tab_view);
59        setContentView(mViewPager);
60
61        final ActionBar bar = getActionBar();
62        bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
63        if (BrowserActivity.isTablet(this)) {
64            bar.setDisplayOptions(ActionBar.DISPLAY_SHOW_HOME
65                    | ActionBar.DISPLAY_USE_LOGO);
66            bar.setHomeButtonEnabled(true);
67        } else {
68            bar.setDisplayOptions(0);
69        }
70
71        mTabsAdapter = new TabsAdapter(this, mViewPager);
72        mTabsAdapter.addTab(bar.newTab().setText(R.string.tab_bookmarks),
73                BrowserBookmarksPage.class, args);
74
75        if (savedInstanceState != null) {
76            bar.setSelectedNavigationItem(
77                    savedInstanceState.getInt(STATE_SELECTED_TAB, 0));
78        } else {
79            switch (startingView) {
80            case Bookmarks:
81                mViewPager.setCurrentItem(0);
82                break;
83            case History:
84                mViewPager.setCurrentItem(1);
85                break;
86            case Snapshots:
87                mViewPager.setCurrentItem(2);
88                break;
89            }
90        }
91    }
92
93    @Override
94    protected void onSaveInstanceState(Bundle outState) {
95        super.onSaveInstanceState(outState);
96        outState.putInt(STATE_SELECTED_TAB,
97                getActionBar().getSelectedNavigationIndex());
98    }
99
100    @Override
101    public void openUrl(String url) {
102        Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
103        setResult(RESULT_OK, i);
104        finish();
105    }
106
107    @Override
108    public void openInNewTab(String... urls) {
109        Intent i = new Intent();
110        i.putExtra(EXTRA_OPEN_ALL, urls);
111        setResult(RESULT_OK, i);
112        finish();
113    }
114
115    @Override
116    public void close() {
117        finish();
118    }
119
120    @Override
121    public void openSnapshot(long id) {
122        Intent i = new Intent();
123        i.putExtra(EXTRA_OPEN_SNAPSHOT, id);
124        setResult(RESULT_OK, i);
125        finish();
126    }
127
128    @Override
129    public boolean onCreateOptionsMenu(Menu menu) {
130        getMenuInflater().inflate(R.menu.combined, menu);
131        return super.onCreateOptionsMenu(menu);
132    }
133
134    @Override
135    public boolean onOptionsItemSelected(MenuItem item) {
136        if (item.getItemId() == android.R.id.home) {
137            finish();
138            return true;
139        } else if (item.getItemId() == R.id.preferences_menu_id) {
140            String url = getIntent().getStringExtra(EXTRA_CURRENT_URL);
141            Intent intent = new Intent(this, BrowserPreferencesPage.class);
142            intent.putExtra(BrowserPreferencesPage.CURRENT_PAGE, url);
143            startActivityForResult(intent, Controller.PREFERENCES_PAGE);
144            return true;
145        }
146        return super.onOptionsItemSelected(item);
147    }
148
149    /**
150     * This is a helper class that implements the management of tabs and all
151     * details of connecting a ViewPager with associated TabHost.  It relies on a
152     * trick.  Normally a tab host has a simple API for supplying a View or
153     * Intent that each tab will show.  This is not sufficient for switching
154     * between pages.  So instead we make the content part of the tab host
155     * 0dp high (it is not shown) and the TabsAdapter supplies its own dummy
156     * view to show as the tab content.  It listens to changes in tabs, and takes
157     * care of switch to the correct page in the ViewPager whenever the selected
158     * tab changes.
159     */
160    public static class TabsAdapter extends FragmentPagerAdapter
161            implements ActionBar.TabListener, ViewPager.OnPageChangeListener {
162        private final Context mContext;
163        private final ActionBar mActionBar;
164        private final ViewPager mViewPager;
165        private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
166
167        static final class TabInfo {
168            private final Class<?> clss;
169            private final Bundle args;
170
171            TabInfo(Class<?> _class, Bundle _args) {
172                clss = _class;
173                args = _args;
174            }
175        }
176
177        public TabsAdapter(Activity activity, ViewPager pager) {
178            super(activity.getFragmentManager());
179            mContext = activity;
180            mActionBar = activity.getActionBar();
181            mViewPager = pager;
182            mViewPager.setAdapter(this);
183            mViewPager.setOnPageChangeListener(this);
184        }
185
186        public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args) {
187            TabInfo info = new TabInfo(clss, args);
188            tab.setTag(info);
189            tab.setTabListener(this);
190            mTabs.add(info);
191            mActionBar.addTab(tab);
192            notifyDataSetChanged();
193        }
194
195        @Override
196        public int getCount() {
197            return mTabs.size();
198        }
199
200        @Override
201        public Fragment getItem(int position) {
202            TabInfo info = mTabs.get(position);
203            return Fragment.instantiate(mContext, info.clss.getName(), info.args);
204        }
205
206        @Override
207        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
208        }
209
210        @Override
211        public void onPageSelected(int position) {
212            mActionBar.setSelectedNavigationItem(position);
213        }
214
215        @Override
216        public void onPageScrollStateChanged(int state) {
217        }
218
219        @Override
220        public void onTabSelected(android.app.ActionBar.Tab tab,
221                FragmentTransaction ft) {
222            Object tag = tab.getTag();
223            for (int i=0; i<mTabs.size(); i++) {
224                if (mTabs.get(i) == tag) {
225                    mViewPager.setCurrentItem(i);
226                }
227            }
228        }
229
230        @Override
231        public void onTabUnselected(android.app.ActionBar.Tab tab,
232                FragmentTransaction ft) {
233        }
234
235        @Override
236        public void onTabReselected(android.app.ActionBar.Tab tab,
237                FragmentTransaction ft) {
238        }
239    }
240
241    private static String makeFragmentName(int viewId, int index) {
242        return "android:switcher:" + viewId + ":" + index;
243    }
244
245}
246