project_files/Android-build/SDL-android-project/src/org/hedgewars/hedgeroid/ChatlogAdapter.java
author Medo <smaxein@googlemail.com>
Thu, 23 Aug 2012 18:28:33 +0200
changeset 7588 27e5857da6af
parent 7584 7831c84cc644
child 10017 de822cd3df3a
permissions -rw-r--r--
Hedgeroid improvements: - Moved frontlib initialization to a slightly better place - Added new JNA type ByteArrayPtr to move more JNA code into the frontlib package and to improve pointer type safety
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/*
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 * Hedgewars for Android. An Android port of Hedgewars, a free turn based strategy game
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 * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2
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 * of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
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 */
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package org.hedgewars.hedgeroid;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.List;
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import org.hedgewars.hedgeroid.netplay.MessageLog;
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import android.content.Context;
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import android.text.method.LinkMovementMethod;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.AbsListView.LayoutParams;
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import android.widget.BaseAdapter;
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import android.widget.TextView;
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/**
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 * Optimization: ListView is smart enough to try re-using the same view for an item
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 * with the same ID, but it still calls getView for those items when the list changes.
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 * Since lines with a given ID never change in our chatlog, we can avoid the effort
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 * of TextView.setText in many cases by checking if the view is already set up for the
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 * line with the right ID - but to do that, the view needs to remember the ID it's
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 * holding the text for. That's what the LoglineView does. 
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 */
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class LoglineView extends TextView {
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	long chatlogId = -1;
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	public LoglineView(Context context) {
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		super(context);
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	}
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}
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/**
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 * For performance reasons, the chatlog is implemented as ListView instead of a
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 * single TextView (although I later learned that TextView might also have
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 * facilities for efficient appending with limited backlog... oh well, this
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 * works). Every chat line is a line in the ListView, and this adapter prepares
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 * the textviews from a messagelog in an efficient way.
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 */
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public class ChatlogAdapter extends BaseAdapter implements MessageLog.Listener {
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	long idOffset = 0;
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	private List<CharSequence> log = new ArrayList<CharSequence>();
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	private Context context;
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	public ChatlogAdapter(Context context) {
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		this.context = context;
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	}
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	public int getCount() {
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		return log.size();
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	}
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	public Object getItem(int position) {
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		return log.get(position);
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	}
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	public long getItemId(int position) {
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		return position+idOffset;
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	}
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	public boolean hasStableIds() {
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		return true;
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	}
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	public void clear() {
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		idOffset += log.size();
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		log.clear();
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		notifyDataSetChanged();
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	}
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	public void lineAdded(CharSequence text) {
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		log.add(text);
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		notifyDataSetChanged();
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	}
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	public void lineRemoved() {
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		log.remove(0);
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		idOffset += 1;
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		notifyDataSetChanged();
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	}
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	public void setLog(Collection<CharSequence> log) {
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		idOffset += log.size();
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		this.log = new ArrayList<CharSequence>(log);
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		notifyDataSetChanged();
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	}
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	public View getView(int position, View convertView, ViewGroup parent) {
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		LoglineView v = (LoglineView)convertView;
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		if (v == null) {
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			v = new LoglineView(context);
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			v.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
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			v.setMovementMethod(LinkMovementMethod.getInstance());
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		}
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		long id = getItemId(position);
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		if(id != v.chatlogId) {
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			v.setText(log.get(position));
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			v.chatlogId = id;
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		}
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		return v;
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	}
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}