1 package org.hedgewars.hedgeroid.netplay;

     2 

     3 import java.util.ArrayList;

     4 import java.util.Collection;

     5 import java.util.List;

     6 

     7 import org.hedgewars.hedgeroid.netplay.MessageLog.Observer;

     8 

     9 import android.content.Context;

    10 import android.text.method.LinkMovementMethod;

    11 import android.view.View;

    12 import android.view.ViewGroup;

    13 import android.widget.AbsListView.LayoutParams;

    14 import android.widget.BaseAdapter;

    15 import android.widget.TextView;

    16 

    17 /**

    18  * Optimization: ListView is smart enough to try re-using the same view for an item

    19  * with the same ID, but it still calls getView for those items when the list changes.

    20  * Since lines with a given ID never change in our chatlog, we can avoid the effort

    21  * of TextView.setText in many cases by checking if the view is already set up for the

    22  * line with the right ID - but to do that, the view needs to remember the ID it's

    23  * holding the text for. That's what the LoglineView does. 

    24  */

    25 class LoglineView extends TextView {

    26 	long chatlogId = -1;

    27 	

    28 	public LoglineView(Context context) {

    29 		super(context);

    30 	}

    31 }

    32 

    33 public class ChatlogAdapter extends BaseAdapter implements Observer {

    34 	long idOffset = 0;

    35 	private List<CharSequence> log = new ArrayList<CharSequence>();

    36 	private Context context;

    37 	

    38 	public ChatlogAdapter(Context context) {

    39 		this.context = context;

    40 	}

    41 	

    42 	public int getCount() {

    43 		return log.size();

    44 	}

    45 

    46 	public Object getItem(int position) {

    47 		return log.get(position);

    48 	}

    49 

    50 	public long getItemId(int position) {

    51 		return position+idOffset;

    52 	}

    53 

    54 	public boolean hasStableIds() {

    55 		return true;

    56 	}

    57 

    58 	public void clear() {

    59 		idOffset += log.size();

    60 		log.clear();

    61 		notifyDataSetChanged();

    62 	}

    63 	

    64 	public void lineAdded(CharSequence text) {

    65 		log.add(text);

    66 		notifyDataSetChanged();

    67 	}

    68 	

    69 	public void lineRemoved() {

    70 		log.remove(0);

    71 		idOffset += 1;

    72 		notifyDataSetChanged();

    73 	}

    74 	

    75 	public void setLog(Collection<CharSequence> log) {

    76 		idOffset += log.size();

    77 		this.log = new ArrayList<CharSequence>(log);

    78 		notifyDataSetChanged();

    79 	}

    80 	

    81 	public View getView(int position, View convertView, ViewGroup parent) {

    82 		LoglineView v = (LoglineView)convertView;

    83 		if (v == null) {

    84 			v = new LoglineView(context);

    85 			v.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));

    86 			v.setMovementMethod(LinkMovementMethod.getInstance());

    87 		}

    88 		long id = getItemId(position);

    89 		if(id != v.chatlogId) {

    90 			v.setText(log.get(position));

    91 			v.chatlogId = id;

    92 		}

    93 		return v;

    94 	}

    95 }