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
init(Params params)34     protected void init(Params params) {
35         params.setNumItems(10)
36                 .setItemScreenSizeFactor(1.0/5);
37     }
38 
39 
40     @Override
createView(int position, ViewGroup parent, int desiredHeight)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
convertView(int position, View convertView, ViewGroup parent)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 
ExpandWhenSelectedView(Context context, int desiredHeight)65         public ExpandWhenSelectedView(Context context, int desiredHeight) {
66             super(context);
67             mDesiredHeight = desiredHeight;
68         }
69 
70         @Override
setSelected(boolean selected)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