michael@0: /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: package org.mozilla.gecko.home;
michael@0: 
michael@0: import java.util.ArrayList;
michael@0: import java.util.EnumSet;
michael@0: import java.util.HashMap;
michael@0: import java.util.Map;
michael@0: 
michael@0: import org.mozilla.gecko.R;
michael@0: import org.mozilla.gecko.Telemetry;
michael@0: import org.mozilla.gecko.TelemetryContract;
michael@0: import org.mozilla.gecko.db.BrowserContract.Combined;
michael@0: import org.mozilla.gecko.db.BrowserContract.Thumbnails;
michael@0: import org.mozilla.gecko.db.BrowserDB;
michael@0: import org.mozilla.gecko.db.BrowserDB.URLColumns;
michael@0: import org.mozilla.gecko.db.TopSitesCursorWrapper;
michael@0: import org.mozilla.gecko.favicons.Favicons;
michael@0: import org.mozilla.gecko.favicons.OnFaviconLoadedListener;
michael@0: import org.mozilla.gecko.gfx.BitmapUtils;
michael@0: import org.mozilla.gecko.home.HomePager.OnUrlOpenListener;
michael@0: import org.mozilla.gecko.home.PinSiteDialog.OnSiteSelectedListener;
michael@0: import org.mozilla.gecko.home.TopSitesGridView.OnEditPinnedSiteListener;
michael@0: import org.mozilla.gecko.home.TopSitesGridView.TopSitesGridContextMenuInfo;
michael@0: import org.mozilla.gecko.util.ThreadUtils;
michael@0: 
michael@0: import android.app.Activity;
michael@0: import android.content.ContentResolver;
michael@0: import android.content.Context;
michael@0: import android.content.res.Configuration;
michael@0: import android.database.Cursor;
michael@0: import android.graphics.Bitmap;
michael@0: import android.net.Uri;
michael@0: import android.os.Bundle;
michael@0: import android.support.v4.app.FragmentManager;
michael@0: import android.support.v4.app.LoaderManager.LoaderCallbacks;
michael@0: import android.support.v4.content.AsyncTaskLoader;
michael@0: import android.support.v4.content.Loader;
michael@0: import android.support.v4.widget.CursorAdapter;
michael@0: import android.text.TextUtils;
michael@0: import android.util.Log;
michael@0: import android.view.ContextMenu;
michael@0: import android.view.ContextMenu.ContextMenuInfo;
michael@0: import android.view.LayoutInflater;
michael@0: import android.view.MenuInflater;
michael@0: import android.view.MenuItem;
michael@0: import android.view.View;
michael@0: import android.view.ViewGroup;
michael@0: import android.widget.AdapterView;
michael@0: import android.widget.ListView;
michael@0: 
michael@0: /**
michael@0:  * Fragment that displays frecency search results in a ListView.
michael@0:  */
michael@0: public class TopSitesPanel extends HomeFragment {
michael@0:     // Logging tag name
michael@0:     private static final String LOGTAG = "GeckoTopSitesPanel";
michael@0: 
michael@0:     // Cursor loader ID for the top sites
michael@0:     private static final int LOADER_ID_TOP_SITES = 0;
michael@0: 
michael@0:     // Loader ID for thumbnails
michael@0:     private static final int LOADER_ID_THUMBNAILS = 1;
michael@0: 
michael@0:     // Key for thumbnail urls
michael@0:     private static final String THUMBNAILS_URLS_KEY = "urls";
michael@0: 
michael@0:     // Adapter for the list of top sites
michael@0:     private VisitedAdapter mListAdapter;
michael@0: 
michael@0:     // Adapter for the grid of top sites
michael@0:     private TopSitesGridAdapter mGridAdapter;
michael@0: 
michael@0:     // List of top sites
michael@0:     private HomeListView mList;
michael@0: 
michael@0:     // Grid of top sites
michael@0:     private TopSitesGridView mGrid;
michael@0: 
michael@0:     // Callbacks used for the search and favicon cursor loaders
michael@0:     private CursorLoaderCallbacks mCursorLoaderCallbacks;
michael@0: 
michael@0:     // Callback for thumbnail loader
michael@0:     private ThumbnailsLoaderCallbacks mThumbnailsLoaderCallbacks;
michael@0: 
michael@0:     // Listener for editing pinned sites.
michael@0:     private EditPinnedSiteListener mEditPinnedSiteListener;
michael@0: 
michael@0:     // On URL open listener
michael@0:     private OnUrlOpenListener mUrlOpenListener;
michael@0: 
michael@0:     // Max number of entries shown in the grid from the cursor.
michael@0:     private int mMaxGridEntries;
michael@0: 
michael@0:     // Time in ms until the Gecko thread is reset to normal priority.
michael@0:     private static final long PRIORITY_RESET_TIMEOUT = 10000;
michael@0: 
michael@0:     public static TopSitesPanel newInstance() {
michael@0:         return new TopSitesPanel();
michael@0:     }
michael@0: 
michael@0:     public TopSitesPanel() {
michael@0:         mUrlOpenListener = null;
michael@0:     }
michael@0: 
michael@0:     private static boolean logDebug = Log.isLoggable(LOGTAG, Log.DEBUG);
michael@0:     private static boolean logVerbose = Log.isLoggable(LOGTAG, Log.VERBOSE);
michael@0: 
michael@0:     private static void debug(final String message) {
michael@0:         if (logDebug) {
michael@0:             Log.d(LOGTAG, message);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     private static void trace(final String message) {
michael@0:         if (logVerbose) {
michael@0:             Log.v(LOGTAG, message);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public void onAttach(Activity activity) {
michael@0:         super.onAttach(activity);
michael@0: 
michael@0:         mMaxGridEntries = activity.getResources().getInteger(R.integer.number_of_top_sites);
michael@0: 
michael@0:         try {
michael@0:             mUrlOpenListener = (OnUrlOpenListener) activity;
michael@0:         } catch (ClassCastException e) {
michael@0:             throw new ClassCastException(activity.toString()
michael@0:                     + " must implement HomePager.OnUrlOpenListener");
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public void onDetach() {
michael@0:         super.onDetach();
michael@0: 
michael@0:         mUrlOpenListener = null;
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
michael@0:         final View view = inflater.inflate(R.layout.home_top_sites_panel, container, false);
michael@0: 
michael@0:         mList = (HomeListView) view.findViewById(R.id.list);
michael@0: 
michael@0:         mGrid = new TopSitesGridView(getActivity());
michael@0:         mList.addHeaderView(mGrid);
michael@0: 
michael@0:         return view;
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public void onViewCreated(View view, Bundle savedInstanceState) {
michael@0:         mEditPinnedSiteListener = new EditPinnedSiteListener();
michael@0: 
michael@0:         mList.setTag(HomePager.LIST_TAG_TOP_SITES);
michael@0:         mList.setHeaderDividersEnabled(false);
michael@0: 
michael@0:         mList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
michael@0:             @Override
michael@0:             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
michael@0:                 final ListView list = (ListView) parent;
michael@0:                 final int headerCount = list.getHeaderViewsCount();
michael@0:                 if (position < headerCount) {
michael@0:                     // The click is on a header, don't do anything.
michael@0:                     return;
michael@0:                 }
michael@0: 
michael@0:                 // Absolute position for the adapter.
michael@0:                 position += (mGridAdapter.getCount() - headerCount);
michael@0: 
michael@0:                 final Cursor c = mListAdapter.getCursor();
michael@0:                 if (c == null || !c.moveToPosition(position)) {
michael@0:                     return;
michael@0:                 }
michael@0: 
michael@0:                 final String url = c.getString(c.getColumnIndexOrThrow(URLColumns.URL));
michael@0: 
michael@0:                 Telemetry.sendUIEvent(TelemetryContract.Event.LOAD_URL, TelemetryContract.Method.LIST_ITEM);
michael@0: 
michael@0:                 // This item is a TwoLinePageRow, so we allow switch-to-tab.
michael@0:                 mUrlOpenListener.onUrlOpen(url, EnumSet.of(OnUrlOpenListener.Flags.ALLOW_SWITCH_TO_TAB));
michael@0:             }
michael@0:         });
michael@0: 
michael@0:         mList.setContextMenuInfoFactory(new HomeContextMenuInfo.Factory() {
michael@0:             @Override
michael@0:             public HomeContextMenuInfo makeInfoForCursor(View view, int position, long id, Cursor cursor) {
michael@0:                 final HomeContextMenuInfo info = new HomeContextMenuInfo(view, position, id);
michael@0:                 info.url = cursor.getString(cursor.getColumnIndexOrThrow(Combined.URL));
michael@0:                 info.title = cursor.getString(cursor.getColumnIndexOrThrow(Combined.TITLE));
michael@0:                 info.historyId = cursor.getInt(cursor.getColumnIndexOrThrow(Combined.HISTORY_ID));
michael@0:                 final int bookmarkIdCol = cursor.getColumnIndexOrThrow(Combined.BOOKMARK_ID);
michael@0:                 if (cursor.isNull(bookmarkIdCol)) {
michael@0:                     // If this is a combined cursor, we may get a history item without a
michael@0:                     // bookmark, in which case the bookmarks ID column value will be null.
michael@0:                     info.bookmarkId =  -1;
michael@0:                 } else {
michael@0:                     info.bookmarkId = cursor.getInt(bookmarkIdCol);
michael@0:                 }
michael@0:                 return info;
michael@0:             }
michael@0:         });
michael@0: 
michael@0:         mGrid.setOnUrlOpenListener(mUrlOpenListener);
michael@0:         mGrid.setOnEditPinnedSiteListener(mEditPinnedSiteListener);
michael@0: 
michael@0:         registerForContextMenu(mList);
michael@0:         registerForContextMenu(mGrid);
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public void onDestroyView() {
michael@0:         super.onDestroyView();
michael@0: 
michael@0:         // Discard any additional item clicks on the list
michael@0:         // as the panel is getting destroyed (see bug 930160).
michael@0:         mList.setOnItemClickListener(null);
michael@0:         mList = null;
michael@0: 
michael@0:         mGrid = null;
michael@0:         mListAdapter = null;
michael@0:         mGridAdapter = null;
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public void onConfigurationChanged(Configuration newConfig) {
michael@0:         super.onConfigurationChanged(newConfig);
michael@0: 
michael@0:         // Detach and reattach the fragment as the layout changes.
michael@0:         if (isVisible()) {
michael@0:             getFragmentManager().beginTransaction()
michael@0:                                 .detach(this)
michael@0:                                 .attach(this)
michael@0:                                 .commitAllowingStateLoss();
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public void onActivityCreated(Bundle savedInstanceState) {
michael@0:         super.onActivityCreated(savedInstanceState);
michael@0: 
michael@0:         final Activity activity = getActivity();
michael@0: 
michael@0:         // Setup the top sites grid adapter.
michael@0:         mGridAdapter = new TopSitesGridAdapter(activity, null);
michael@0:         mGrid.setAdapter(mGridAdapter);
michael@0: 
michael@0:         // Setup the top sites list adapter.
michael@0:         mListAdapter = new VisitedAdapter(activity, null);
michael@0:         mList.setAdapter(mListAdapter);
michael@0: 
michael@0:         // Create callbacks before the initial loader is started
michael@0:         mCursorLoaderCallbacks = new CursorLoaderCallbacks();
michael@0:         mThumbnailsLoaderCallbacks = new ThumbnailsLoaderCallbacks();
michael@0:         loadIfVisible();
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public void onCreateContextMenu(ContextMenu menu, View view, ContextMenuInfo menuInfo) {
michael@0:         if (menuInfo == null) {
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         if (!(menuInfo instanceof TopSitesGridContextMenuInfo)) {
michael@0:             // Long pressed item was not a Top Sites GridView item. Superclass
michael@0:             // can handle this.
michael@0:             super.onCreateContextMenu(menu, view, menuInfo);
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         // Long pressed item was a Top Sites GridView item, handle it.
michael@0:         MenuInflater inflater = new MenuInflater(view.getContext());
michael@0:         inflater.inflate(R.menu.home_contextmenu, menu);
michael@0: 
michael@0:         // Hide ununsed menu items.
michael@0:         menu.findItem(R.id.home_open_in_reader).setVisible(false);
michael@0:         menu.findItem(R.id.home_edit_bookmark).setVisible(false);
michael@0:         menu.findItem(R.id.home_remove).setVisible(false);
michael@0: 
michael@0:         TopSitesGridContextMenuInfo info = (TopSitesGridContextMenuInfo) menuInfo;
michael@0:         menu.setHeaderTitle(info.getDisplayTitle());
michael@0: 
michael@0:         if (!TextUtils.isEmpty(info.url)) {
michael@0:             if (info.isPinned) {
michael@0:                 menu.findItem(R.id.top_sites_pin).setVisible(false);
michael@0:             } else {
michael@0:                 menu.findItem(R.id.top_sites_unpin).setVisible(false);
michael@0:             }
michael@0:         } else {
michael@0:             menu.findItem(R.id.home_open_new_tab).setVisible(false);
michael@0:             menu.findItem(R.id.home_open_private_tab).setVisible(false);
michael@0:             menu.findItem(R.id.top_sites_pin).setVisible(false);
michael@0:             menu.findItem(R.id.top_sites_unpin).setVisible(false);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public boolean onContextItemSelected(MenuItem item) {
michael@0:         if (super.onContextItemSelected(item)) {
michael@0:             // HomeFragment was able to handle to selected item.
michael@0:             return true;
michael@0:         }
michael@0: 
michael@0:         ContextMenuInfo menuInfo = item.getMenuInfo();
michael@0: 
michael@0:         if (menuInfo == null || !(menuInfo instanceof TopSitesGridContextMenuInfo)) {
michael@0:             return false;
michael@0:         }
michael@0: 
michael@0:         TopSitesGridContextMenuInfo info = (TopSitesGridContextMenuInfo) menuInfo;
michael@0:         final Activity activity = getActivity();
michael@0: 
michael@0:         final int itemId = item.getItemId();
michael@0: 
michael@0:         if (itemId == R.id.top_sites_pin) {
michael@0:             final String url = info.url;
michael@0:             final String title = info.title;
michael@0:             final int position = info.position;
michael@0:             final Context context = getActivity().getApplicationContext();
michael@0: 
michael@0:             ThreadUtils.postToBackgroundThread(new Runnable() {
michael@0:                 @Override
michael@0:                 public void run() {
michael@0:                     BrowserDB.pinSite(context.getContentResolver(), url, title, position);
michael@0:                 }
michael@0:             });
michael@0: 
michael@0:             Telemetry.sendUIEvent(TelemetryContract.Event.TOP_SITES_PIN);
michael@0:             return true;
michael@0:         }
michael@0: 
michael@0:         if (itemId == R.id.top_sites_unpin) {
michael@0:             final int position = info.position;
michael@0:             final Context context = getActivity().getApplicationContext();
michael@0: 
michael@0:             ThreadUtils.postToBackgroundThread(new Runnable() {
michael@0:                 @Override
michael@0:                 public void run() {
michael@0:                     BrowserDB.unpinSite(context.getContentResolver(), position);
michael@0:                 }
michael@0:             });
michael@0: 
michael@0:             Telemetry.sendUIEvent(TelemetryContract.Event.TOP_SITES_UNPIN);
michael@0:             return true;
michael@0:         }
michael@0: 
michael@0:         if (itemId == R.id.top_sites_edit) {
michael@0:             // Decode "user-entered" URLs before showing them.
michael@0:             mEditPinnedSiteListener.onEditPinnedSite(info.position, decodeUserEnteredUrl(info.url));
michael@0: 
michael@0:             Telemetry.sendUIEvent(TelemetryContract.Event.TOP_SITES_EDIT);
michael@0:             return true;
michael@0:         }
michael@0: 
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     protected void load() {
michael@0:         getLoaderManager().initLoader(LOADER_ID_TOP_SITES, null, mCursorLoaderCallbacks);
michael@0: 
michael@0:         // Since this is the primary fragment that loads whenever about:home is
michael@0:         // visited, we want to load it as quickly as possible. Heavy load on
michael@0:         // the Gecko thread can slow down the time it takes for thumbnails to
michael@0:         // appear, especially during startup (bug 897162). By minimizing the
michael@0:         // Gecko thread priority, we ensure that the UI appears quickly. The
michael@0:         // priority is reset to normal once thumbnails are loaded.
michael@0:         ThreadUtils.reduceGeckoPriority(PRIORITY_RESET_TIMEOUT);
michael@0:     }
michael@0: 
michael@0:     static String encodeUserEnteredUrl(String url) {
michael@0:         return Uri.fromParts("user-entered", url, null).toString();
michael@0:     }
michael@0: 
michael@0:     /**
michael@0:      * Listener for editing pinned sites.
michael@0:      */
michael@0:     private class EditPinnedSiteListener implements OnEditPinnedSiteListener,
michael@0:                                                     OnSiteSelectedListener {
michael@0:         // Tag for the PinSiteDialog fragment.
michael@0:         private static final String TAG_PIN_SITE = "pin_site";
michael@0: 
michael@0:         // Position of the pin.
michael@0:         private int mPosition;
michael@0: 
michael@0:         @Override
michael@0:         public void onEditPinnedSite(int position, String searchTerm) {
michael@0:             mPosition = position;
michael@0: 
michael@0:             final FragmentManager manager = getChildFragmentManager();
michael@0:             PinSiteDialog dialog = (PinSiteDialog) manager.findFragmentByTag(TAG_PIN_SITE);
michael@0:             if (dialog == null) {
michael@0:                 dialog = PinSiteDialog.newInstance();
michael@0:             }
michael@0: 
michael@0:             dialog.setOnSiteSelectedListener(this);
michael@0:             dialog.setSearchTerm(searchTerm);
michael@0:             dialog.show(manager, TAG_PIN_SITE);
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public void onSiteSelected(final String url, final String title) {
michael@0:             final int position = mPosition;
michael@0:             final Context context = getActivity().getApplicationContext();
michael@0:             ThreadUtils.postToBackgroundThread(new Runnable() {
michael@0:                 @Override
michael@0:                 public void run() {
michael@0:                     BrowserDB.pinSite(context.getContentResolver(), url, title, position);
michael@0:                 }
michael@0:             });
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     private void updateUiFromCursor(Cursor c) {
michael@0:         mList.setHeaderDividersEnabled(c != null && c.getCount() > mMaxGridEntries);
michael@0:     }
michael@0: 
michael@0:     private static class TopSitesLoader extends SimpleCursorLoader {
michael@0:         // Max number of search results
michael@0:         private static final int SEARCH_LIMIT = 30;
michael@0:         private int mMaxGridEntries;
michael@0: 
michael@0:         public TopSitesLoader(Context context) {
michael@0:             super(context);
michael@0:             mMaxGridEntries = context.getResources().getInteger(R.integer.number_of_top_sites);
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public Cursor loadCursor() {
michael@0:             trace("TopSitesLoader.loadCursor()");
michael@0:             return BrowserDB.getTopSites(getContext().getContentResolver(), mMaxGridEntries, SEARCH_LIMIT);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     private class VisitedAdapter extends CursorAdapter {
michael@0:         public VisitedAdapter(Context context, Cursor cursor) {
michael@0:             super(context, cursor, 0);
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public int getCount() {
michael@0:             return Math.max(0, super.getCount() - mMaxGridEntries);
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public Object getItem(int position) {
michael@0:             return super.getItem(position + mMaxGridEntries);
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public void bindView(View view, Context context, Cursor cursor) {
michael@0:             final int position = cursor.getPosition();
michael@0:             cursor.moveToPosition(position + mMaxGridEntries);
michael@0: 
michael@0:             final TwoLinePageRow row = (TwoLinePageRow) view;
michael@0:             row.updateFromCursor(cursor);
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public View newView(Context context, Cursor cursor, ViewGroup parent) {
michael@0:             return LayoutInflater.from(context).inflate(R.layout.bookmark_item_row, parent, false);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     public class TopSitesGridAdapter extends CursorAdapter {
michael@0:         // Cache to store the thumbnails.
michael@0:         // Ensure that this is only accessed from the UI thread.
michael@0:         private Map<String, Bitmap> mThumbnails;
michael@0: 
michael@0:         public TopSitesGridAdapter(Context context, Cursor cursor) {
michael@0:             super(context, cursor, 0);
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public int getCount() {
michael@0:             return Math.min(mMaxGridEntries, super.getCount());
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         protected void onContentChanged() {
michael@0:             // Don't do anything. We don't want to regenerate every time
michael@0:             // our database is updated.
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         /**
michael@0:          * Update the thumbnails returned by the db.
michael@0:          *
michael@0:          * @param thumbnails A map of urls and their thumbnail bitmaps.
michael@0:          */
michael@0:         public void updateThumbnails(Map<String, Bitmap> thumbnails) {
michael@0:             mThumbnails = thumbnails;
michael@0: 
michael@0:             final int count = mGrid.getChildCount();
michael@0:             for (int i = 0; i < count; i++) {
michael@0:                 TopSitesGridItemView gridItem = (TopSitesGridItemView) mGrid.getChildAt(i);
michael@0: 
michael@0:                 // All the views have already got their initial state at this point.
michael@0:                 // This will force each view to load favicons for the missing
michael@0:                 // thumbnails if necessary.
michael@0:                 gridItem.markAsDirty();
michael@0:             }
michael@0: 
michael@0:             notifyDataSetChanged();
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public void bindView(View bindView, Context context, Cursor cursor) {
michael@0:             String url = "";
michael@0:             String title = "";
michael@0:             boolean pinned = false;
michael@0: 
michael@0:             // Cursor is already moved to required position.
michael@0:             if (!cursor.isAfterLast()) {
michael@0:                 url = cursor.getString(cursor.getColumnIndexOrThrow(URLColumns.URL));
michael@0:                 title = cursor.getString(cursor.getColumnIndexOrThrow(URLColumns.TITLE));
michael@0:                 pinned = ((TopSitesCursorWrapper) cursor).isPinned();
michael@0:             }
michael@0: 
michael@0:             final TopSitesGridItemView view = (TopSitesGridItemView) bindView;
michael@0: 
michael@0:             // If there is no url, then show "add bookmark".
michael@0:             if (TextUtils.isEmpty(url)) {
michael@0:                 // Wait until thumbnails are loaded before showing anything.
michael@0:                 if (mThumbnails != null) {
michael@0:                     view.blankOut();
michael@0:                 }
michael@0: 
michael@0:                 return;
michael@0:             }
michael@0: 
michael@0:             // Show the thumbnail, if any.
michael@0:             Bitmap thumbnail = (mThumbnails != null ? mThumbnails.get(url) : null);
michael@0: 
michael@0:             // Debounce bindView calls to avoid redundant redraws and favicon
michael@0:             // fetches.
michael@0:             final boolean updated = view.updateState(title, url, pinned, thumbnail);
michael@0: 
michael@0:             // If thumbnails are still being loaded, don't try to load favicons
michael@0:             // just yet. If we sent in a thumbnail, we're done now.
michael@0:             if (mThumbnails == null || thumbnail != null) {
michael@0:                 return;
michael@0:             }
michael@0: 
michael@0:             // Thumbnails are delivered late, so we can't short-circuit any
michael@0:             // sooner than this. But we can avoid a duplicate favicon
michael@0:             // fetch...
michael@0:             if (!updated) {
michael@0:                 debug("bindView called twice for same values; short-circuiting.");
michael@0:                 return;
michael@0:             }
michael@0: 
michael@0:             // If we have no thumbnail, attempt to show a Favicon instead.
michael@0:             LoadIDAwareFaviconLoadedListener listener = new LoadIDAwareFaviconLoadedListener(view);
michael@0:             final int loadId = Favicons.getSizedFaviconForPageFromLocal(url, listener);
michael@0:             if (loadId == Favicons.LOADED) {
michael@0:                 // Great!
michael@0:                 return;
michael@0:             }
michael@0: 
michael@0:             // Otherwise, do this until the async lookup returns.
michael@0:             view.displayThumbnail(R.drawable.favicon);
michael@0: 
michael@0:             // Give each side enough information to shake hands later.
michael@0:             listener.setLoadId(loadId);
michael@0:             view.setLoadId(loadId);
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public View newView(Context context, Cursor cursor, ViewGroup parent) {
michael@0:             return new TopSitesGridItemView(context);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     private static class LoadIDAwareFaviconLoadedListener implements OnFaviconLoadedListener {
michael@0:         private volatile int loadId = Favicons.NOT_LOADING;
michael@0:         private final TopSitesGridItemView view;
michael@0:         public LoadIDAwareFaviconLoadedListener(TopSitesGridItemView view) {
michael@0:             this.view = view;
michael@0:         }
michael@0: 
michael@0:         public void setLoadId(int id) {
michael@0:             this.loadId = id;
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public void onFaviconLoaded(String url, String faviconURL, Bitmap favicon) {
michael@0:             if (TextUtils.equals(this.view.getUrl(), url)) {
michael@0:                 this.view.displayFavicon(favicon, faviconURL, this.loadId);
michael@0:             }
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     private class CursorLoaderCallbacks implements LoaderCallbacks<Cursor> {
michael@0:         @Override
michael@0:         public Loader<Cursor> onCreateLoader(int id, Bundle args) {
michael@0:             trace("Creating TopSitesLoader: " + id);
michael@0:             return new TopSitesLoader(getActivity());
michael@0:         }
michael@0: 
michael@0:         /**
michael@0:          * This method is called *twice* in some circumstances.
michael@0:          *
michael@0:          * If you try to avoid that through some kind of boolean flag,
michael@0:          * sometimes (e.g., returning to the activity) you'll *not* be called
michael@0:          * twice, and thus you'll never draw thumbnails.
michael@0:          *
michael@0:          * The root cause is TopSitesLoader.loadCursor being called twice.
michael@0:          * Why that is... dunno.
michael@0:          */
michael@0:         @Override
michael@0:         public void onLoadFinished(Loader<Cursor> loader, Cursor c) {
michael@0:             debug("onLoadFinished: " + c.getCount() + " rows.");
michael@0: 
michael@0:             mListAdapter.swapCursor(c);
michael@0:             mGridAdapter.swapCursor(c);
michael@0:             updateUiFromCursor(c);
michael@0: 
michael@0:             final int col = c.getColumnIndexOrThrow(URLColumns.URL);
michael@0: 
michael@0:             // Load the thumbnails.
michael@0:             // Even though the cursor we're given is supposed to be fresh,
michael@0:             // we get a bad first value unless we reset its position.
michael@0:             // Using move(-1) and moveToNext() doesn't work correctly under
michael@0:             // rotation, so we use moveToFirst.
michael@0:             if (!c.moveToFirst()) {
michael@0:                 return;
michael@0:             }
michael@0: 
michael@0:             final ArrayList<String> urls = new ArrayList<String>();
michael@0:             int i = 1;
michael@0:             do {
michael@0:                 urls.add(c.getString(col));
michael@0:             } while (i++ < mMaxGridEntries && c.moveToNext());
michael@0: 
michael@0:             if (urls.isEmpty()) {
michael@0:                 return;
michael@0:             }
michael@0: 
michael@0:             Bundle bundle = new Bundle();
michael@0:             bundle.putStringArrayList(THUMBNAILS_URLS_KEY, urls);
michael@0:             getLoaderManager().restartLoader(LOADER_ID_THUMBNAILS, bundle, mThumbnailsLoaderCallbacks);
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public void onLoaderReset(Loader<Cursor> loader) {
michael@0:             if (mListAdapter != null) {
michael@0:                 mListAdapter.swapCursor(null);
michael@0:             }
michael@0: 
michael@0:             if (mGridAdapter != null) {
michael@0:                 mGridAdapter.swapCursor(null);
michael@0:             }
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     /**
michael@0:      * An AsyncTaskLoader to load the thumbnails from a cursor.
michael@0:      */
michael@0:     private static class ThumbnailsLoader extends AsyncTaskLoader<Map<String, Bitmap>> {
michael@0:         private Map<String, Bitmap> mThumbnails;
michael@0:         private ArrayList<String> mUrls;
michael@0: 
michael@0:         public ThumbnailsLoader(Context context, ArrayList<String> urls) {
michael@0:             super(context);
michael@0:             mUrls = urls;
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public Map<String, Bitmap> loadInBackground() {
michael@0:             if (mUrls == null || mUrls.size() == 0) {
michael@0:                 return null;
michael@0:             }
michael@0: 
michael@0:             // Query the DB for thumbnails.
michael@0:             final ContentResolver cr = getContext().getContentResolver();
michael@0:             final Cursor cursor = BrowserDB.getThumbnailsForUrls(cr, mUrls);
michael@0: 
michael@0:             if (cursor == null) {
michael@0:                 return null;
michael@0:             }
michael@0: 
michael@0:             final Map<String, Bitmap> thumbnails = new HashMap<String, Bitmap>();
michael@0: 
michael@0:             try {
michael@0:                 final int urlIndex = cursor.getColumnIndexOrThrow(Thumbnails.URL);
michael@0:                 final int dataIndex = cursor.getColumnIndexOrThrow(Thumbnails.DATA);
michael@0: 
michael@0:                 while (cursor.moveToNext()) {
michael@0:                     String url = cursor.getString(urlIndex);
michael@0: 
michael@0:                     // This should never be null, but if it is...
michael@0:                     final byte[] b = cursor.getBlob(dataIndex);
michael@0:                     if (b == null) {
michael@0:                         continue;
michael@0:                     }
michael@0: 
michael@0:                     final Bitmap bitmap = BitmapUtils.decodeByteArray(b);
michael@0: 
michael@0:                     // Our thumbnails are never null, so if we get a null decoded
michael@0:                     // bitmap, it's because we hit an OOM or some other disaster.
michael@0:                     // Give up immediately rather than hammering on.
michael@0:                     if (bitmap == null) {
michael@0:                         Log.w(LOGTAG, "Aborting thumbnail load; decode failed.");
michael@0:                         break;
michael@0:                     }
michael@0: 
michael@0:                     thumbnails.put(url, bitmap);
michael@0:                 }
michael@0:             } finally {
michael@0:                 cursor.close();
michael@0:             }
michael@0: 
michael@0:             return thumbnails;
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public void deliverResult(Map<String, Bitmap> thumbnails) {
michael@0:             if (isReset()) {
michael@0:                 mThumbnails = null;
michael@0:                 return;
michael@0:             }
michael@0: 
michael@0:             mThumbnails = thumbnails;
michael@0: 
michael@0:             if (isStarted()) {
michael@0:                 super.deliverResult(thumbnails);
michael@0:             }
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         protected void onStartLoading() {
michael@0:             if (mThumbnails != null) {
michael@0:                 deliverResult(mThumbnails);
michael@0:             }
michael@0: 
michael@0:             if (takeContentChanged() || mThumbnails == null) {
michael@0:                 forceLoad();
michael@0:             }
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         protected void onStopLoading() {
michael@0:             cancelLoad();
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public void onCanceled(Map<String, Bitmap> thumbnails) {
michael@0:             mThumbnails = null;
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         protected void onReset() {
michael@0:             super.onReset();
michael@0: 
michael@0:             // Ensure the loader is stopped.
michael@0:             onStopLoading();
michael@0: 
michael@0:             mThumbnails = null;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     /**
michael@0:      * Loader callbacks for the thumbnails on TopSitesGridView.
michael@0:      */
michael@0:     private class ThumbnailsLoaderCallbacks implements LoaderCallbacks<Map<String, Bitmap>> {
michael@0:         @Override
michael@0:         public Loader<Map<String, Bitmap>> onCreateLoader(int id, Bundle args) {
michael@0:             return new ThumbnailsLoader(getActivity(), args.getStringArrayList(THUMBNAILS_URLS_KEY));
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public void onLoadFinished(Loader<Map<String, Bitmap>> loader, Map<String, Bitmap> thumbnails) {
michael@0:             if (mGridAdapter != null) {
michael@0:                 mGridAdapter.updateThumbnails(thumbnails);
michael@0:             }
michael@0: 
michael@0:             // Once thumbnails have finished loading, the UI is ready. Reset
michael@0:             // Gecko to normal priority.
michael@0:             ThreadUtils.resetGeckoPriority();
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public void onLoaderReset(Loader<Map<String, Bitmap>> loader) {
michael@0:             if (mGridAdapter != null) {
michael@0:                 mGridAdapter.updateThumbnails(null);
michael@0:             }
michael@0:         }
michael@0:     }
michael@0: }