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        mTabsAdapter.addTab(bar.newTab().setText(R.string.tab_history),
75                BrowserHistoryPage.class, args);
76        mTabsAdapter.addTab(bar.newTab().setText(R.string.tab_snapshots),
77                BrowserSnapshotPage.class, args);
78
79        if (savedInstanceState != null) {
80            bar.setSelectedNavigationItem(
81                    savedInstanceState.getInt(STATE_SELECTED_TAB, 0));
82        } else {
83            switch (startingView) {
84            case Bookmarks:
85                mViewPager.setCurrentItem(0);
86                break;
87            case History:
88                mViewPager.setCurrentItem(1);
89                break;
90            case Snapshots:
91                mViewPager.setCurrentItem(2);
92                break;
93            }
94        }
95    }
96
97    @Override
98    protected void onSaveInstanceState(Bundle outState) {
99        super.onSaveInstanceState(outState);
100        outState.putInt(STATE_SELECTED_TAB,
101                getActionBar().getSelectedNavigationIndex());
102    }
103
104    @Override
105    public void openUrl(String url) {
106        Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
107        setResult(RESULT_OK, i);
108        finish();
109    }
110
111    @Override
112    public void openInNewTab(String... urls) {
113        Intent i = new Intent();
114        i.putExtra(EXTRA_OPEN_ALL, urls);
115        setResult(RESULT_OK, i);
116        finish();
117    }
118
119    @Override
120    public void close() {
121        finish();
122    }
123
124    @Override
125    public void openSnapshot(long id) {
126        Intent i = new Intent();
127        i.putExtra(EXTRA_OPEN_SNAPSHOT, id);
128        setResult(RESULT_OK, i);
129        finish();
130    }
131
132    @Override
133    public boolean onCreateOptionsMenu(Menu menu) {
134        getMenuInflater().inflate(R.menu.combined, menu);
135        return super.onCreateOptionsMenu(menu);
136    }
137
138    @Override
139    public boolean onOptionsItemSelected(MenuItem item) {
140        if (item.getItemId() == android.R.id.home) {
141            finish();
142            return true;
143        } else if (item.getItemId() == R.id.preferences_menu_id) {
144            String url = getIntent().getStringExtra(EXTRA_CURRENT_URL);
145            Intent intent = new Intent(this, BrowserPreferencesPage.class);
146            intent.putExtra(BrowserPreferencesPage.CURRENT_PAGE, url);
147            startActivityForResult(intent, Controller.PREFERENCES_PAGE);
148            return true;
149        }
150        return super.onOptionsItemSelected(item);
151    }
152
153    /**
154     * This is a helper class that implements the management of tabs and all
155     * details of connecting a ViewPager with associated TabHost.  It relies on a
156     * trick.  Normally a tab host has a simple API for supplying a View or
157     * Intent that each tab will show.  This is not sufficient for switching
158     * between pages.  So instead we make the content part of the tab host
159     * 0dp high (it is not shown) and the TabsAdapter supplies its own dummy
160     * view to show as the tab content.  It listens to changes in tabs, and takes
161     * care of switch to the correct page in the ViewPager whenever the selected
162     * tab changes.
163     */
164    public static class TabsAdapter extends FragmentPagerAdapter
165            implements ActionBar.TabListener, ViewPager.OnPageChangeListener {
166        private final Context mContext;
167        private final ActionBar mActionBar;
168        private final ViewPager mViewPager;
169        private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
170
171        static final class TabInfo {
172            private final Class<?> clss;
173            private final Bundle args;
174
175            TabInfo(Class<?> _class, Bundle _args) {
176                clss = _class;
177                args = _args;
178            }
179        }
180
181        public TabsAdapter(Activity activity, ViewPager pager) {
182            super(activity.getFragmentManager());
183            mContext = activity;
184            mActionBar = activity.getActionBar();
185            mViewPager = pager;
186            mViewPager.setAdapter(this);
187            mViewPager.setOnPageChangeListener(this);
188        }
189
190        public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args) {
191            TabInfo info = new TabInfo(clss, args);
192            tab.setTag(info);
193            tab.setTabListener(this);
194            mTabs.add(info);
195            mActionBar.addTab(tab);
196            notifyDataSetChanged();
197        }
198
199        @Override
200        public int getCount() {
201            return mTabs.size();
202        }
203
204        @Override
205        public Fragment getItem(int position) {
206            TabInfo info = mTabs.get(position);
207            return Fragment.instantiate(mContext, info.clss.getName(), info.args);
208        }
209
210        @Override
211        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
212        }
213
214        @Override
215        public void onPageSelected(int position) {
216            mActionBar.setSelectedNavigationItem(position);
217        }
218
219        @Override
220        public void onPageScrollStateChanged(int state) {
221        }
222
223        @Override
224        public void onTabSelected(android.app.ActionBar.Tab tab,
225                FragmentTransaction ft) {
226            Object tag = tab.getTag();
227            for (int i=0; i<mTabs.size(); i++) {
228                if (mTabs.get(i) == tag) {
229                    mViewPager.setCurrentItem(i);
230                }
231            }
232        }
233
234        @Override
235        public void onTabUnselected(android.app.ActionBar.Tab tab,
236                FragmentTransaction ft) {
237        }
238
239        @Override
240        public void onTabReselected(android.app.ActionBar.Tab tab,
241                FragmentTransaction ft) {
242        }
243    }
244
245    private static String makeFragmentName(int viewId, int index) {
246        return "android:switcher:" + viewId + ":" + index;
247    }
248
249}
250