1 files changed, 155 insertions, 0 deletions
diff --git a/src/com/android/packageinstaller/TabsAdapter.java b/src/com/android/packageinstaller/TabsAdapter.java
new file mode 100644
index 00000000..3509e092
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+++ b/src/com/android/packageinstaller/TabsAdapter.java
@@ -0,0 +1,155 @@
+/*
+**
+** Copyright 2013, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+package com.android.packageinstaller;
+
+import android.app.Activity;
+import android.content.Context;
+import android.graphics.Rect;
+import android.support.v4.view.PagerAdapter;
+import android.support.v4.view.ViewPager;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TabHost;
+import android.widget.TabWidget;
+
+import java.util.ArrayList;
+
+/**
+ * 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 paged in the ViewPager whenever the selected
+ * tab changes.
+ */
+public class TabsAdapter extends PagerAdapter
+        implements TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener {
+    private final Context mContext;
+    private final TabHost mTabHost;
+    private final ViewPager mViewPager;
+    private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
+    private final Rect mTempRect = new Rect();
+
+    static final class TabInfo {
+        private final String tag;
+        private final View view;
+
+        TabInfo(String _tag, View _view) {
+            tag = _tag;
+            view = _view;
+        }
+    }
+
+    static class DummyTabFactory implements TabHost.TabContentFactory {
+        private final Context mContext;
+
+        public DummyTabFactory(Context context) {
+            mContext = context;
+        }
+
+        @Override
+        public View createTabContent(String tag) {
+            View v = new View(mContext);
+            v.setMinimumWidth(0);
+            v.setMinimumHeight(0);
+            return v;
+        }
+    }
+
+    public TabsAdapter(Activity activity, TabHost tabHost, ViewPager pager) {
+        mContext = activity;
+        mTabHost = tabHost;
+        mViewPager = pager;
+        mTabHost.setOnTabChangedListener(this);
+        mViewPager.setAdapter(this);
+        mViewPager.setOnPageChangeListener(this);
+    }
+
+    public void addTab(TabHost.TabSpec tabSpec, View view) {
+        tabSpec.setContent(new DummyTabFactory(mContext));
+        String tag = tabSpec.getTag();
+
+        TabInfo info = new TabInfo(tag, view);
+        mTabs.add(info);
+        mTabHost.addTab(tabSpec);
+        notifyDataSetChanged();
+    }
+
+    @Override
+    public int getCount() {
+        return mTabs.size();
+    }
+
+    @Override
+    public Object instantiateItem(ViewGroup container, int position) {
+        View view = mTabs.get(position).view;
+        container.addView(view);
+        return view;
+    }
+
+    @Override
+    public void destroyItem(ViewGroup container, int position, Object object) {
+        container.removeView((View)object);
+    }
+
+    @Override
+    public boolean isViewFromObject(View view, Object object) {
+        return view == object;
+    }
+
+    @Override
+    public void onTabChanged(String tabId) {
+        int position = mTabHost.getCurrentTab();
+        mViewPager.setCurrentItem(position);
+    }
+
+    @Override
+    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+    }
+
+    @Override
+    public void onPageSelected(int position) {
+        // Unfortunately when TabHost changes the current tab, it kindly
+        // also takes care of putting focus on it when not in touch mode.
+        // The jerk.
+        // This hack tries to prevent this from pulling focus out of our
+        // ViewPager.
+        TabWidget widget = mTabHost.getTabWidget();
+        int oldFocusability = widget.getDescendantFocusability();
+        widget.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
+        mTabHost.setCurrentTab(position);
+        widget.setDescendantFocusability(oldFocusability);
+
+        // Scroll the current tab into visibility if needed.
+        View tab = widget.getChildTabViewAt(position);
+        mTempRect.set(tab.getLeft(), tab.getTop(), tab.getRight(), tab.getBottom());
+        widget.requestRectangleOnScreen(mTempRect, false);
+
+        // Make sure the scrollbars are visible for a moment after selection
+        final View contentView = mTabs.get(position).view;
+        if (contentView instanceof CaffeinatedScrollView) {
+            ((CaffeinatedScrollView) contentView).awakenScrollBars();
+        }
+    }
+
+    @Override
+    public void onPageScrollStateChanged(int state) {
+    }
+}