Support horizontal swipe in combo activity

 Bug: 5145315

Change-Id: I1e9b4a6bae325244c7a3fb6159deadc3fcf170e6

1 files changed, 152 insertions, 13 deletions

diff --git a/src/com/android/browser/ComboViewActivity.java b/src/com/android/browser/ComboViewActivity.java
index cea18849..9bdce185 100644
--- a/src/com/android/browser/ComboViewActivity.java
+++ b/src/com/android/browser/ComboViewActivity.java
@@ -15,18 +15,26 @@
  */
 package com.android.browser;
 
+import android.app.ActionBar;
 import android.app.Activity;
+import android.app.Fragment;
+import android.app.FragmentTransaction;
+import android.content.Context;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.Bundle;
+import android.support.v13.app.FragmentPagerAdapter;
+import android.support.v4.view.ViewPager;
 import android.view.Menu;
 import android.view.MenuItem;
 
-import com.android.browser.CombinedBookmarkHistoryView.CombinedBookmarksCallbacks;
 import com.android.browser.UI.ComboViews;
 
+import java.util.ArrayList;
+
 public class ComboViewActivity extends Activity implements CombinedBookmarksCallbacks {
 
+    private static final String STATE_SELECTED_TAB = "tab";
     public static final String EXTRA_COMBO_ARGS = "combo_args";
     public static final String EXTRA_INITIAL_VIEW = "initial_view";
 
@@ -34,8 +42,8 @@ public class ComboViewActivity extends Activity implements CombinedBookmarksCall
     public static final String EXTRA_OPEN_ALL = "open_all";
     public static final String EXTRA_CURRENT_URL = "url";
     public static final String EXTRA_BOOKMARK_PAGE = "create_bookmark";
-
-    private CombinedBookmarkHistoryView mComboView;
+    private ViewPager mViewPager;
+    private TabsAdapter mTabsAdapter;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -47,9 +55,50 @@ public class ComboViewActivity extends Activity implements CombinedBookmarksCall
         ComboViews startingView = svStr != null
                 ? ComboViews.valueOf(svStr)
                 : ComboViews.Bookmarks;
-        mComboView = new CombinedBookmarkHistoryView(this, this,
-                startingView, args);
-        setContentView(mComboView);
+        mViewPager = new ViewPager(this);
+        mViewPager.setId(R.id.tab_view);
+        setContentView(mViewPager);
+
+        final ActionBar bar = getActionBar();
+        bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
+        if (BrowserActivity.isTablet(this)) {
+            bar.setDisplayOptions(ActionBar.DISPLAY_SHOW_HOME
+                    | ActionBar.DISPLAY_USE_LOGO);
+        } else {
+            bar.setDisplayOptions(0);
+        }
+
+        mTabsAdapter = new TabsAdapter(this, mViewPager);
+        mTabsAdapter.addTab(bar.newTab().setText(R.string.tab_bookmarks),
+                BrowserBookmarksPage.class, args);
+        mTabsAdapter.addTab(bar.newTab().setText(R.string.tab_history),
+                BrowserHistoryPage.class, args);
+        mTabsAdapter.addTab(bar.newTab().setText(R.string.tab_snapshots),
+                BrowserSnapshotPage.class, args);
+
+        if (savedInstanceState != null) {
+            bar.setSelectedNavigationItem(
+                    savedInstanceState.getInt(STATE_SELECTED_TAB, 0));
+        } else {
+            switch (startingView) {
+            case Bookmarks:
+                mViewPager.setCurrentItem(0);
+                break;
+            case History:
+                mViewPager.setCurrentItem(1);
+                break;
+            case Snapshots:
+                mViewPager.setCurrentItem(2);
+                break;
+            }
+        }
+    }
+
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putInt(STATE_SELECTED_TAB,
+                getActionBar().getSelectedNavigationIndex());
     }
 
     @Override
@@ -81,13 +130,6 @@ public class ComboViewActivity extends Activity implements CombinedBookmarksCall
     }
 
     @Override
-    public void onBackPressed() {
-        if (!mComboView.onBackPressed()) {
-            super.onBackPressed();
-        }
-    }
-
-    @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         getMenuInflater().inflate(R.menu.combined, menu);
         return super.onCreateOptionsMenu(menu);
@@ -107,4 +149,101 @@ public class ComboViewActivity extends Activity implements CombinedBookmarksCall
         }
         return super.onOptionsItemSelected(item);
     }
+
+    /**
+     * This is a helper class that implements the management of tabs and all
+     * details of connecting a ViewPager with associated TabHost.  It relies on a
+     * trick.  Normally a tab host has a simple API for supplying a View or
+     * Intent that each tab will show.  This is not sufficient for switching
+     * between pages.  So instead we make the content part of the tab host
+     * 0dp high (it is not shown) and the TabsAdapter supplies its own dummy
+     * view to show as the tab content.  It listens to changes in tabs, and takes
+     * care of switch to the correct page in the ViewPager whenever the selected
+     * tab changes.
+     */
+    public static class TabsAdapter extends FragmentPagerAdapter
+            implements ActionBar.TabListener, ViewPager.OnPageChangeListener {
+        private final Context mContext;
+        private final ActionBar mActionBar;
+        private final ViewPager mViewPager;
+        private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
+
+        static final class TabInfo {
+            private final Class<?> clss;
+            private final Bundle args;
+
+            TabInfo(Class<?> _class, Bundle _args) {
+                clss = _class;
+                args = _args;
+            }
+        }
+
+        public TabsAdapter(Activity activity, ViewPager pager) {
+            super(activity.getFragmentManager());
+            mContext = activity;
+            mActionBar = activity.getActionBar();
+            mViewPager = pager;
+            mViewPager.setAdapter(this);
+            mViewPager.setOnPageChangeListener(this);
+        }
+
+        public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args) {
+            TabInfo info = new TabInfo(clss, args);
+            tab.setTag(info);
+            tab.setTabListener(this);
+            mTabs.add(info);
+            mActionBar.addTab(tab);
+            notifyDataSetChanged();
+        }
+
+        @Override
+        public int getCount() {
+            return mTabs.size();
+        }
+
+        @Override
+        public Fragment getItem(int position) {
+            TabInfo info = mTabs.get(position);
+            return Fragment.instantiate(mContext, info.clss.getName(), info.args);
+        }
+
+        @Override
+        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+        }
+
+        @Override
+        public void onPageSelected(int position) {
+            mActionBar.setSelectedNavigationItem(position);
+        }
+
+        @Override
+        public void onPageScrollStateChanged(int state) {
+        }
+
+        @Override
+        public void onTabSelected(android.app.ActionBar.Tab tab,
+                FragmentTransaction ft) {
+            Object tag = tab.getTag();
+            for (int i=0; i<mTabs.size(); i++) {
+                if (mTabs.get(i) == tag) {
+                    mViewPager.setCurrentItem(i);
+                }
+            }
+        }
+
+        @Override
+        public void onTabUnselected(android.app.ActionBar.Tab tab,
+                FragmentTransaction ft) {
+        }
+
+        @Override
+        public void onTabReselected(android.app.ActionBar.Tab tab,
+                FragmentTransaction ft) {
+        }
+    }
+
+    private static String makeFragmentName(int viewId, int index) {
+        return "android:switcher:" + viewId + ":" + index;
+    }
+
 }