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.util.ListScenario;
21 import android.view.View;
22 import android.view.ViewGroup;
23 import android.widget.AbsListView;
24 import android.widget.TextView;
25 
26 /**
27  * A list where each item expands by 1.5 when selected.
28  */
29 public class ListItemsExpandOnSelection extends ListScenario {
30 
31 
32     @Override
init(Params params)33     protected void init(Params params) {
34         params.setNumItems(10)
35                 .setItemScreenSizeFactor(1.0/5);
36     }
37 
38 
39     @Override
createView(int position, ViewGroup parent, int desiredHeight)40     protected View createView(int position, ViewGroup parent, int desiredHeight) {
41         TextView result = new ExpandWhenSelectedView(parent.getContext(), desiredHeight);
42         result.setHeight(desiredHeight);
43         result.setFocusable(mItemsFocusable);
44         result.setText(getValueAtPosition(position));
45         final AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
46                 ViewGroup.LayoutParams.MATCH_PARENT,
47                 ViewGroup.LayoutParams.WRAP_CONTENT);
48         result.setLayoutParams(lp);
49         return result;
50     }
51 
52 
53     @Override
convertView(int position, View convertView, ViewGroup parent)54     public View convertView(int position, View convertView, ViewGroup parent) {
55         ((ExpandWhenSelectedView)convertView).setText(getValueAtPosition(position));
56         return convertView;
57     }
58 
59 
60     static private class ExpandWhenSelectedView extends TextView {
61 
62         private final int mDesiredHeight;
63 
ExpandWhenSelectedView(Context context, int desiredHeight)64         public ExpandWhenSelectedView(Context context, int desiredHeight) {
65             super(context);
66             mDesiredHeight = desiredHeight;
67         }
68 
69         @Override
setSelected(boolean selected)70         public void setSelected(boolean selected) {
71             super.setSelected(selected);
72             if (selected) {
73                 setHeight((int) (mDesiredHeight * 1.5));
74             } else {
75                 setHeight(mDesiredHeight);
76             }
77         }
78     }
79 }
80