src/com/android/browser/view/BookmarkExpandableView.java - platform/packages/apps/Browser - Git at Google

 /*
  * Copyright (C) 2011 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.browser.view;

 import android.content.Context;
 import android.database.DataSetObserver;
 import android.provider.BrowserContract;
 import android.util.AttributeSet;
 import android.view.ContextMenu;
 import android.view.ContextMenu.ContextMenuInfo;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseExpandableListAdapter;
 import android.widget.ExpandableListAdapter;
 import android.widget.ExpandableListView;
 import android.widget.FrameLayout;
 import android.widget.LinearLayout;
 import android.widget.TextView;

 import com.android.browser.BreadCrumbView;
 import com.android.browser.BrowserBookmarksAdapter;
 import com.android.browser.R;
 import com.android.internal.view.menu.MenuBuilder;

 import org.json.JSONException;
 import org.json.JSONObject;

 import java.util.ArrayList;
 import java.util.HashMap;

 public class BookmarkExpandableView extends ExpandableListView
         implements BreadCrumbView.Controller {

     public static final String LOCAL_ACCOUNT_NAME = "local";

     private BookmarkAccountAdapter mAdapter;
     private int mColumnWidth;
     private Context mContext;
     private OnChildClickListener mOnChildClickListener;
     private ContextMenuInfo mContextMenuInfo = null;
     private OnCreateContextMenuListener mOnCreateContextMenuListener;
     private boolean mLongClickable;
     private BreadCrumbView.Controller mBreadcrumbController;
     private int mMaxColumnCount;

     public BookmarkExpandableView(Context context) {
         super(context);
         init(context);
     }

     public BookmarkExpandableView(Context context, AttributeSet attrs) {
         super(context, attrs);
         init(context);
     }

     public BookmarkExpandableView(
             Context context, AttributeSet attrs, int defStyle) {
         super(context, attrs, defStyle);
         init(context);
     }

     void init(Context context) {
         mContext = context;
         setItemsCanFocus(true);
         setLongClickable(false);
         mMaxColumnCount = mContext.getResources()
                 .getInteger(R.integer.max_bookmark_columns);
         setScrollBarStyle(SCROLLBARS_OUTSIDE_OVERLAY);
         mAdapter = new BookmarkAccountAdapter(mContext);
         super.setAdapter(mAdapter);
     }

     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         int width = MeasureSpec.getSize(widthMeasureSpec);
         int widthMode = MeasureSpec.getMode(widthMeasureSpec);
         if (width > 0) {
             mAdapter.measureChildren(width);
             setPadding(mAdapter.mRowPadding, 0, mAdapter.mRowPadding, 0);
             widthMeasureSpec = MeasureSpec.makeMeasureSpec(width, widthMode);
         }
         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
         if (width != getMeasuredWidth()) {
             mAdapter.measureChildren(getMeasuredWidth());
         }
     }

     @Override
     public void setAdapter(ExpandableListAdapter adapter) {
         throw new RuntimeException("Not supported");
     }

     public void setColumnWidthFromLayout(int layout) {
         LayoutInflater infalter = LayoutInflater.from(mContext);
         View v = infalter.inflate(layout, this, false);
         v.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
         mColumnWidth = v.getMeasuredWidth();
     }

     public void clearAccounts() {
         mAdapter.clear();
     }

     public void addAccount(String accountName, BrowserBookmarksAdapter adapter,
             boolean expandGroup) {
         // First, check if it already exists
         int indexOf = mAdapter.mGroups.indexOf(accountName);
         if (indexOf >= 0) {
             BrowserBookmarksAdapter existing = mAdapter.mChildren.get(indexOf);
             if (existing != adapter) {
                 existing.unregisterDataSetObserver(mAdapter.mObserver);
                 // Replace the existing one
                 mAdapter.mChildren.remove(indexOf);
                 mAdapter.mChildren.add(indexOf, adapter);
                 adapter.registerDataSetObserver(mAdapter.mObserver);
             }
         } else {
             mAdapter.mGroups.add(accountName);
             mAdapter.mChildren.add(adapter);
             adapter.registerDataSetObserver(mAdapter.mObserver);
         }
         mAdapter.notifyDataSetChanged();
         if (expandGroup) {
             expandGroup(mAdapter.getGroupCount() - 1);
         }
     }

     @Override
     public void setOnChildClickListener(OnChildClickListener onChildClickListener) {
         mOnChildClickListener = onChildClickListener;
     }

     @Override
     public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) {
         mOnCreateContextMenuListener = l;
         if (!mLongClickable) {
             mLongClickable = true;
             if (mAdapter != null) {
                 mAdapter.notifyDataSetChanged();
             }
         }
     }

     @Override
     public void createContextMenu(ContextMenu menu) {
         // The below is copied from View - we want to bypass the override
         // in AbsListView

         ContextMenuInfo menuInfo = getContextMenuInfo();

         // Sets the current menu info so all items added to menu will have
         // my extra info set.
         ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo);

         onCreateContextMenu(menu);
         if (mOnCreateContextMenuListener != null) {
             mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo);
         }

         // Clear the extra information so subsequent items that aren't mine don't
         // have my extra info.
         ((MenuBuilder)menu).setCurrentMenuInfo(null);

         if (mParent != null) {
             mParent.createContextMenu(menu);
         }
     }

     @Override
     public boolean showContextMenuForChild(View originalView) {
         Integer groupPosition = (Integer) originalView.getTag(R.id.group_position);
         Integer childPosition = (Integer) originalView.getTag(R.id.child_position);

         if (groupPosition == null || childPosition == null) {
             return false;
         }

         mContextMenuInfo = new BookmarkContextMenuInfo(childPosition, groupPosition);
         if (getParent() != null) {
             getParent().showContextMenuForChild(this);
         }

         return true;
     }

     @Override
     public void onTop(BreadCrumbView view, int level, Object data) {
         if (mBreadcrumbController != null) {
             mBreadcrumbController.onTop(view, level, data);
         }
     }

     public void setBreadcrumbController(BreadCrumbView.Controller controller) {
         mBreadcrumbController = controller;
     }

     @Override
     protected ContextMenuInfo getContextMenuInfo() {
         return mContextMenuInfo;
     }

     public BrowserBookmarksAdapter getChildAdapter(int groupPosition) {
         return mAdapter.mChildren.get(groupPosition);
     }

     private OnClickListener mChildClickListener = new OnClickListener() {

         @Override
         public void onClick(View v) {
             if (v.getVisibility() != View.VISIBLE) {
                 return;
             }
             int groupPosition = (Integer) v.getTag(R.id.group_position);
             int childPosition = (Integer) v.getTag(R.id.child_position);
             if (mAdapter.getGroupCount() <= groupPosition
                     || mAdapter.mChildren.get(groupPosition).getCount() <= childPosition) {
                 return;
             }
             long id = mAdapter.mChildren.get(groupPosition).getItemId(childPosition);
             if (mOnChildClickListener != null) {
                 mOnChildClickListener.onChildClick(BookmarkExpandableView.this,
                         v, groupPosition, childPosition, id);
             }
         }
     };

     private OnClickListener mGroupOnClickListener = new OnClickListener() {

         @Override
         public void onClick(View v) {
             int groupPosition = (Integer) v.getTag(R.id.group_position);
             if (isGroupExpanded(groupPosition)) {
                 collapseGroup(groupPosition);
             } else {
                 expandGroup(groupPosition, true);
             }
         }
     };

     public BreadCrumbView getBreadCrumbs(int groupPosition) {
         return mAdapter.getBreadCrumbView(groupPosition);
     }

     public JSONObject saveGroupState() throws JSONException {
         JSONObject obj = new JSONObject();
         int count = mAdapter.getGroupCount();
         for (int i = 0; i < count; i++) {
             String acctName = mAdapter.mGroups.get(i);
             if (!isGroupExpanded(i)) {
                 obj.put(acctName != null ? acctName : LOCAL_ACCOUNT_NAME, false);
             }
         }
         return obj;
     }

     class BookmarkAccountAdapter extends BaseExpandableListAdapter {
         ArrayList<BrowserBookmarksAdapter> mChildren;
         ArrayList<String> mGroups;
         HashMap<Integer, BreadCrumbView> mBreadcrumbs =
                 new HashMap<Integer, BreadCrumbView>();
         LayoutInflater mInflater;
         int mRowCount = 1; // assume at least 1 child fits in a row
         int mLastViewWidth = -1;
         int mRowPadding = -1;
         DataSetObserver mObserver = new DataSetObserver() {
             @Override
             public void onChanged() {
                 notifyDataSetChanged();
             }

             @Override
             public void onInvalidated() {
                 notifyDataSetInvalidated();
             }
         };

         public BookmarkAccountAdapter(Context context) {
             mContext = context;
             mInflater = LayoutInflater.from(mContext);
             mChildren = new ArrayList<BrowserBookmarksAdapter>();
             mGroups = new ArrayList<String>();
         }

         public void clear() {
             mGroups.clear();
             mChildren.clear();
             notifyDataSetChanged();
         }

         @Override
         public Object getChild(int groupPosition, int childPosition) {
             return mChildren.get(groupPosition).getItem(childPosition);
         }

         @Override
         public long getChildId(int groupPosition, int childPosition) {
             return childPosition;
         }

         @Override
         public View getChildView(int groupPosition, int childPosition,
                 boolean isLastChild, View convertView, ViewGroup parent) {
             if (convertView == null) {
                 convertView = mInflater.inflate(R.layout.bookmark_grid_row, parent, false);
             }
             BrowserBookmarksAdapter childAdapter = mChildren.get(groupPosition);
             int rowCount = mRowCount;
             LinearLayout row = (LinearLayout) convertView;
             if (row.getChildCount() > rowCount) {
                 row.removeViews(rowCount, row.getChildCount() - rowCount);
             }
             for (int i = 0; i < rowCount; i++) {
                 View cv = null;
                 if (row.getChildCount() > i) {
                     cv = row.getChildAt(i);
                 }
                 int realChildPosition = (childPosition * rowCount) + i;
                 if (realChildPosition < childAdapter.getCount()) {
                     View v = childAdapter.getView(realChildPosition, cv, row);
                     v.setTag(R.id.group_position, groupPosition);
                     v.setTag(R.id.child_position, realChildPosition);
                     v.setOnClickListener(mChildClickListener);
                     v.setLongClickable(mLongClickable);
                     if (cv == null) {
                         row.addView(v);
                     } else if (cv != v) {
                         row.removeViewAt(i);
                         row.addView(v, i);
                     } else {
                         cv.setVisibility(View.VISIBLE);
                     }
                 } else if (cv != null) {
                     cv.setVisibility(View.GONE);
                 }
             }
             return row;
         }

         @Override
         public int getChildrenCount(int groupPosition) {
             BrowserBookmarksAdapter adapter = mChildren.get(groupPosition);
             return (int) Math.ceil(adapter.getCount() / (float)mRowCount);
         }

         @Override
         public Object getGroup(int groupPosition) {
             return mChildren.get(groupPosition);
         }

         @Override
         public int getGroupCount() {
             return mGroups.size();
         }

         public void measureChildren(int viewWidth) {
             if (mLastViewWidth == viewWidth) return;

             int rowCount = viewWidth / mColumnWidth;
             if (mMaxColumnCount > 0) {
                 rowCount = Math.min(rowCount, mMaxColumnCount);
             }
             int rowPadding = (viewWidth - (rowCount * mColumnWidth)) / 2;
             boolean notify = rowCount != mRowCount || rowPadding != mRowPadding;
             mRowCount = rowCount;
             mRowPadding = rowPadding;
             mLastViewWidth = viewWidth;
             if (notify) {
                 notifyDataSetChanged();
             }
         }

         @Override
         public long getGroupId(int groupPosition) {
             return groupPosition;
         }

         @Override
         public View getGroupView(int groupPosition, boolean isExpanded,
                 View view, ViewGroup parent) {
             if (view == null) {
                 view = mInflater.inflate(R.layout.bookmark_group_view, parent, false);
                 view.setOnClickListener(mGroupOnClickListener);
             }
             view.setTag(R.id.group_position, groupPosition);
             FrameLayout crumbHolder = (FrameLayout) view.findViewById(R.id.crumb_holder);
             crumbHolder.removeAllViews();
             BreadCrumbView crumbs = getBreadCrumbView(groupPosition);
             if (crumbs.getParent() != null) {
                 ((ViewGroup)crumbs.getParent()).removeView(crumbs);
             }
             crumbHolder.addView(crumbs);
             TextView name = (TextView) view.findViewById(R.id.group_name);
             String groupName = mGroups.get(groupPosition);
             if (groupName == null) {
                 groupName = mContext.getString(R.string.local_bookmarks);
             }
             name.setText(groupName);
             return view;
         }

         public BreadCrumbView getBreadCrumbView(int groupPosition) {
             BreadCrumbView crumbs = mBreadcrumbs.get(groupPosition);
             if (crumbs == null) {
                 crumbs = (BreadCrumbView)
                         mInflater.inflate(R.layout.bookmarks_header, null);
                 crumbs.setController(BookmarkExpandableView.this);
                 crumbs.setUseBackButton(true);
                 crumbs.setMaxVisible(2);
                 String bookmarks = mContext.getString(R.string.bookmarks);
                 crumbs.pushView(bookmarks, false,
                         BrowserContract.Bookmarks.CONTENT_URI_DEFAULT_FOLDER);
                 crumbs.setTag(R.id.group_position, groupPosition);
                 crumbs.setVisibility(View.GONE);
                 mBreadcrumbs.put(groupPosition, crumbs);
             }
             return crumbs;
         }

         @Override
         public boolean hasStableIds() {
             return false;
         }

         @Override
         public boolean isChildSelectable(int groupPosition, int childPosition) {
             return true;
         }
     }

     public static class BookmarkContextMenuInfo implements ContextMenuInfo {

         private BookmarkContextMenuInfo(int childPosition, int groupPosition) {
             this.childPosition = childPosition;
             this.groupPosition = groupPosition;
         }

         public int childPosition;
         public int groupPosition;
     }

 }
	/*
	* Copyright (C) 2011 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.browser.view;

	import android.content.Context;
	import android.database.DataSetObserver;
	import android.provider.BrowserContract;
	import android.util.AttributeSet;
	import android.view.ContextMenu;
	import android.view.ContextMenu.ContextMenuInfo;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.BaseExpandableListAdapter;
	import android.widget.ExpandableListAdapter;
	import android.widget.ExpandableListView;
	import android.widget.FrameLayout;
	import android.widget.LinearLayout;
	import android.widget.TextView;

	import com.android.browser.BreadCrumbView;
	import com.android.browser.BrowserBookmarksAdapter;
	import com.android.browser.R;
	import com.android.internal.view.menu.MenuBuilder;

	import org.json.JSONException;
	import org.json.JSONObject;

	import java.util.ArrayList;
	import java.util.HashMap;

	public class BookmarkExpandableView extends ExpandableListView
	implements BreadCrumbView.Controller {

	public static final String LOCAL_ACCOUNT_NAME = "local";

	private BookmarkAccountAdapter mAdapter;
	private int mColumnWidth;
	private Context mContext;
	private OnChildClickListener mOnChildClickListener;
	private ContextMenuInfo mContextMenuInfo = null;
	private OnCreateContextMenuListener mOnCreateContextMenuListener;
	private boolean mLongClickable;
	private BreadCrumbView.Controller mBreadcrumbController;
	private int mMaxColumnCount;

	public BookmarkExpandableView(Context context) {
	super(context);
	init(context);
	}

	public BookmarkExpandableView(Context context, AttributeSet attrs) {
	super(context, attrs);
	init(context);
	}

	public BookmarkExpandableView(
	Context context, AttributeSet attrs, int defStyle) {
	super(context, attrs, defStyle);
	init(context);
	}

	void init(Context context) {
	mContext = context;
	setItemsCanFocus(true);
	setLongClickable(false);
	mMaxColumnCount = mContext.getResources()
	.getInteger(R.integer.max_bookmark_columns);
	setScrollBarStyle(SCROLLBARS_OUTSIDE_OVERLAY);
	mAdapter = new BookmarkAccountAdapter(mContext);
	super.setAdapter(mAdapter);
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
	int width = MeasureSpec.getSize(widthMeasureSpec);
	int widthMode = MeasureSpec.getMode(widthMeasureSpec);
	if (width > 0) {
	mAdapter.measureChildren(width);
	setPadding(mAdapter.mRowPadding, 0, mAdapter.mRowPadding, 0);
	widthMeasureSpec = MeasureSpec.makeMeasureSpec(width, widthMode);
	}
	super.onMeasure(widthMeasureSpec, heightMeasureSpec);
	if (width != getMeasuredWidth()) {
	mAdapter.measureChildren(getMeasuredWidth());
	}
	}

	@Override
	public void setAdapter(ExpandableListAdapter adapter) {
	throw new RuntimeException("Not supported");
	}

	public void setColumnWidthFromLayout(int layout) {
	LayoutInflater infalter = LayoutInflater.from(mContext);
	View v = infalter.inflate(layout, this, false);
	v.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
	mColumnWidth = v.getMeasuredWidth();
	}

	public void clearAccounts() {
	mAdapter.clear();
	}

	public void addAccount(String accountName, BrowserBookmarksAdapter adapter,
	boolean expandGroup) {
	// First, check if it already exists
	int indexOf = mAdapter.mGroups.indexOf(accountName);
	if (indexOf >= 0) {
	BrowserBookmarksAdapter existing = mAdapter.mChildren.get(indexOf);
	if (existing != adapter) {
	existing.unregisterDataSetObserver(mAdapter.mObserver);
	// Replace the existing one
	mAdapter.mChildren.remove(indexOf);
	mAdapter.mChildren.add(indexOf, adapter);
	adapter.registerDataSetObserver(mAdapter.mObserver);
	}
	} else {
	mAdapter.mGroups.add(accountName);
	mAdapter.mChildren.add(adapter);
	adapter.registerDataSetObserver(mAdapter.mObserver);
	}
	mAdapter.notifyDataSetChanged();
	if (expandGroup) {
	expandGroup(mAdapter.getGroupCount() - 1);
	}
	}

	@Override
	public void setOnChildClickListener(OnChildClickListener onChildClickListener) {
	mOnChildClickListener = onChildClickListener;
	}

	@Override
	public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) {
	mOnCreateContextMenuListener = l;
	if (!mLongClickable) {
	mLongClickable = true;
	if (mAdapter != null) {
	mAdapter.notifyDataSetChanged();
	}
	}
	}

	@Override
	public void createContextMenu(ContextMenu menu) {
	// The below is copied from View - we want to bypass the override
	// in AbsListView

	ContextMenuInfo menuInfo = getContextMenuInfo();

	// Sets the current menu info so all items added to menu will have
	// my extra info set.
	((MenuBuilder)menu).setCurrentMenuInfo(menuInfo);

	onCreateContextMenu(menu);
	if (mOnCreateContextMenuListener != null) {
	mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo);
	}

	// Clear the extra information so subsequent items that aren't mine don't
	// have my extra info.
	((MenuBuilder)menu).setCurrentMenuInfo(null);

	if (mParent != null) {
	mParent.createContextMenu(menu);
	}
	}

	@Override
	public boolean showContextMenuForChild(View originalView) {
	Integer groupPosition = (Integer) originalView.getTag(R.id.group_position);
	Integer childPosition = (Integer) originalView.getTag(R.id.child_position);

	if (groupPosition == null \|\| childPosition == null) {
	return false;
	}

	mContextMenuInfo = new BookmarkContextMenuInfo(childPosition, groupPosition);
	if (getParent() != null) {
	getParent().showContextMenuForChild(this);
	}

	return true;
	}

	@Override
	public void onTop(BreadCrumbView view, int level, Object data) {
	if (mBreadcrumbController != null) {
	mBreadcrumbController.onTop(view, level, data);
	}
	}

	public void setBreadcrumbController(BreadCrumbView.Controller controller) {
	mBreadcrumbController = controller;
	}

	@Override
	protected ContextMenuInfo getContextMenuInfo() {
	return mContextMenuInfo;
	}

	public BrowserBookmarksAdapter getChildAdapter(int groupPosition) {
	return mAdapter.mChildren.get(groupPosition);
	}

	private OnClickListener mChildClickListener = new OnClickListener() {

	@Override
	public void onClick(View v) {
	if (v.getVisibility() != View.VISIBLE) {
	return;
	}
	int groupPosition = (Integer) v.getTag(R.id.group_position);
	int childPosition = (Integer) v.getTag(R.id.child_position);
	if (mAdapter.getGroupCount() <= groupPosition
	\|\| mAdapter.mChildren.get(groupPosition).getCount() <= childPosition) {
	return;
	}
	long id = mAdapter.mChildren.get(groupPosition).getItemId(childPosition);
	if (mOnChildClickListener != null) {
	mOnChildClickListener.onChildClick(BookmarkExpandableView.this,
	v, groupPosition, childPosition, id);
	}
	}
	};

	private OnClickListener mGroupOnClickListener = new OnClickListener() {

	@Override
	public void onClick(View v) {
	int groupPosition = (Integer) v.getTag(R.id.group_position);
	if (isGroupExpanded(groupPosition)) {
	collapseGroup(groupPosition);
	} else {
	expandGroup(groupPosition, true);
	}
	}
	};

	public BreadCrumbView getBreadCrumbs(int groupPosition) {
	return mAdapter.getBreadCrumbView(groupPosition);
	}

	public JSONObject saveGroupState() throws JSONException {
	JSONObject obj = new JSONObject();
	int count = mAdapter.getGroupCount();
	for (int i = 0; i < count; i++) {
	String acctName = mAdapter.mGroups.get(i);
	if (!isGroupExpanded(i)) {
	obj.put(acctName != null ? acctName : LOCAL_ACCOUNT_NAME, false);
	}
	}
	return obj;
	}

	class BookmarkAccountAdapter extends BaseExpandableListAdapter {
	ArrayList<BrowserBookmarksAdapter> mChildren;
	ArrayList<String> mGroups;
	HashMap<Integer, BreadCrumbView> mBreadcrumbs =
	new HashMap<Integer, BreadCrumbView>();
	LayoutInflater mInflater;
	int mRowCount = 1; // assume at least 1 child fits in a row
	int mLastViewWidth = -1;
	int mRowPadding = -1;
	DataSetObserver mObserver = new DataSetObserver() {
	@Override
	public void onChanged() {
	notifyDataSetChanged();
	}

	@Override
	public void onInvalidated() {
	notifyDataSetInvalidated();
	}
	};

	public BookmarkAccountAdapter(Context context) {
	mContext = context;
	mInflater = LayoutInflater.from(mContext);
	mChildren = new ArrayList<BrowserBookmarksAdapter>();
	mGroups = new ArrayList<String>();
	}

	public void clear() {
	mGroups.clear();
	mChildren.clear();
	notifyDataSetChanged();
	}

	@Override
	public Object getChild(int groupPosition, int childPosition) {
	return mChildren.get(groupPosition).getItem(childPosition);
	}

	@Override
	public long getChildId(int groupPosition, int childPosition) {
	return childPosition;
	}

	@Override
	public View getChildView(int groupPosition, int childPosition,
	boolean isLastChild, View convertView, ViewGroup parent) {
	if (convertView == null) {
	convertView = mInflater.inflate(R.layout.bookmark_grid_row, parent, false);
	}
	BrowserBookmarksAdapter childAdapter = mChildren.get(groupPosition);
	int rowCount = mRowCount;
	LinearLayout row = (LinearLayout) convertView;
	if (row.getChildCount() > rowCount) {
	row.removeViews(rowCount, row.getChildCount() - rowCount);
	}
	for (int i = 0; i < rowCount; i++) {
	View cv = null;
	if (row.getChildCount() > i) {
	cv = row.getChildAt(i);
	}
	int realChildPosition = (childPosition * rowCount) + i;
	if (realChildPosition < childAdapter.getCount()) {
	View v = childAdapter.getView(realChildPosition, cv, row);
	v.setTag(R.id.group_position, groupPosition);
	v.setTag(R.id.child_position, realChildPosition);
	v.setOnClickListener(mChildClickListener);
	v.setLongClickable(mLongClickable);
	if (cv == null) {
	row.addView(v);
	} else if (cv != v) {
	row.removeViewAt(i);
	row.addView(v, i);
	} else {
	cv.setVisibility(View.VISIBLE);
	}
	} else if (cv != null) {
	cv.setVisibility(View.GONE);
	}
	}
	return row;
	}

	@Override
	public int getChildrenCount(int groupPosition) {
	BrowserBookmarksAdapter adapter = mChildren.get(groupPosition);
	return (int) Math.ceil(adapter.getCount() / (float)mRowCount);
	}

	@Override
	public Object getGroup(int groupPosition) {
	return mChildren.get(groupPosition);
	}

	@Override
	public int getGroupCount() {
	return mGroups.size();
	}

	public void measureChildren(int viewWidth) {
	if (mLastViewWidth == viewWidth) return;

	int rowCount = viewWidth / mColumnWidth;
	if (mMaxColumnCount > 0) {
	rowCount = Math.min(rowCount, mMaxColumnCount);
	}
	int rowPadding = (viewWidth - (rowCount * mColumnWidth)) / 2;
	boolean notify = rowCount != mRowCount \|\| rowPadding != mRowPadding;
	mRowCount = rowCount;
	mRowPadding = rowPadding;
	mLastViewWidth = viewWidth;
	if (notify) {
	notifyDataSetChanged();
	}
	}

	@Override
	public long getGroupId(int groupPosition) {
	return groupPosition;
	}

	@Override
	public View getGroupView(int groupPosition, boolean isExpanded,
	View view, ViewGroup parent) {
	if (view == null) {
	view = mInflater.inflate(R.layout.bookmark_group_view, parent, false);
	view.setOnClickListener(mGroupOnClickListener);
	}
	view.setTag(R.id.group_position, groupPosition);
	FrameLayout crumbHolder = (FrameLayout) view.findViewById(R.id.crumb_holder);
	crumbHolder.removeAllViews();
	BreadCrumbView crumbs = getBreadCrumbView(groupPosition);
	if (crumbs.getParent() != null) {
	((ViewGroup)crumbs.getParent()).removeView(crumbs);
	}
	crumbHolder.addView(crumbs);
	TextView name = (TextView) view.findViewById(R.id.group_name);
	String groupName = mGroups.get(groupPosition);
	if (groupName == null) {
	groupName = mContext.getString(R.string.local_bookmarks);
	}
	name.setText(groupName);
	return view;
	}

	public BreadCrumbView getBreadCrumbView(int groupPosition) {
	BreadCrumbView crumbs = mBreadcrumbs.get(groupPosition);
	if (crumbs == null) {
	crumbs = (BreadCrumbView)
	mInflater.inflate(R.layout.bookmarks_header, null);
	crumbs.setController(BookmarkExpandableView.this);
	crumbs.setUseBackButton(true);
	crumbs.setMaxVisible(2);
	String bookmarks = mContext.getString(R.string.bookmarks);
	crumbs.pushView(bookmarks, false,
	BrowserContract.Bookmarks.CONTENT_URI_DEFAULT_FOLDER);
	crumbs.setTag(R.id.group_position, groupPosition);
	crumbs.setVisibility(View.GONE);
	mBreadcrumbs.put(groupPosition, crumbs);
	}
	return crumbs;
	}

	@Override
	public boolean hasStableIds() {
	return false;
	}

	@Override
	public boolean isChildSelectable(int groupPosition, int childPosition) {
	return true;
	}
	}

	public static class BookmarkContextMenuInfo implements ContextMenuInfo {

	private BookmarkContextMenuInfo(int childPosition, int groupPosition) {
	this.childPosition = childPosition;
	this.groupPosition = groupPosition;
	}

	public int childPosition;
	public int groupPosition;
	}

	}