Home | History | Annotate | Download | only in listview 
      1 /*
      2  * Copyright (C) 2007 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.widget.listview;
     18 
     19 import android.content.Context;
     20 import android.view.View;
     21 import android.view.ViewGroup;
     22 import android.widget.AbsListView;
     23 import android.widget.TextView;
     24 
     25 import android.util.ListScenario;
     26 
     27 /**
     28  * A list where each item expands by 1.5 when selected.
     29  */
     30 public class ListItemsExpandOnSelection extends ListScenario {
     31 
     32 
     33     @Override
     34     protected void init(Params params) {
     35         params.setNumItems(10)
     36                 .setItemScreenSizeFactor(1.0/5);
     37     }
     38 
     39 
     40     @Override
     41     protected View createView(int position, ViewGroup parent, int desiredHeight) {
     42         TextView result = new ExpandWhenSelectedView(parent.getContext(), desiredHeight);
     43         result.setHeight(desiredHeight);
     44         result.setFocusable(mItemsFocusable);
     45         result.setText(getValueAtPosition(position));
     46         final AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
     47                 ViewGroup.LayoutParams.MATCH_PARENT,
     48                 ViewGroup.LayoutParams.WRAP_CONTENT);
     49         result.setLayoutParams(lp);
     50         return result;
     51     }
     52 
     53 
     54     @Override
     55     public View convertView(int position, View convertView, ViewGroup parent) {
     56         ((ExpandWhenSelectedView)convertView).setText(getValueAtPosition(position));
     57         return convertView;
     58     }
     59 
     60 
     61     static private class ExpandWhenSelectedView extends TextView {
     62 
     63         private final int mDesiredHeight;
     64 
     65         public ExpandWhenSelectedView(Context context, int desiredHeight) {
     66             super(context);
     67             mDesiredHeight = desiredHeight;
     68         }
     69 
     70         @Override
     71         public void setSelected(boolean selected) {
     72             super.setSelected(selected);
     73             if (selected) {
     74                 setHeight((int) (mDesiredHeight * 1.5));
     75             } else {
     76                 setHeight(mDesiredHeight);
     77             }
     78         }
     79     }
     80 }
     81