1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.apis.view;
import android.app.Activity;
import android.os.Bundle;
import android.view.ViewGroup;
import android.widget.LinearLayout;
/**
* {@link android.view.View#requestFocus(int, android.graphics.Rect)}
* and
* {@link android.view.View#onFocusChanged(boolean, int, android.graphics.Rect)}
* work together to give a newly focused item a hint about the most interesting
* rectangle of the previously focused view. The view taking focus can use this
* to set an internal selection more appropriate using this rect.
*
* This Activity excercises that behavior using three adjacent {@link InternalSelectionView}
* that report interesting rects when giving up focus, and use interesting rects
* when taking focus to best select the internal row to show as selected.
*
* Were {@link InternalSelectionView} not to override {@link android.view.View#getFocusedRect}, or
* {@link android.view.View#onFocusChanged(boolean, int, android.graphics.Rect)}, the focus would
* jump to some default internal selection (the top) and not allow for the smooth handoff.
*/
public class InternalSelectionFocus extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final LinearLayout layout = new LinearLayout(this);
layout.setOrientation(LinearLayout.HORIZONTAL);
layout.setLayoutParams(new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT));
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(0,
ViewGroup.LayoutParams.MATCH_PARENT, 1);
final InternalSelectionView leftColumn = new InternalSelectionView(this, 5, "left column");
leftColumn.setLayoutParams(params);
leftColumn.setPadding(10, 10, 10, 10);
layout.addView(leftColumn);
final InternalSelectionView middleColumn = new InternalSelectionView(this, 5, "middle column");
middleColumn.setLayoutParams(params);
middleColumn.setPadding(10, 10, 10, 10);
layout.addView(middleColumn);
final InternalSelectionView rightColumn = new InternalSelectionView(this, 5, "right column");
rightColumn.setLayoutParams(params);
rightColumn.setPadding(10, 10, 10, 10);
layout.addView(rightColumn);
setContentView(layout);
}
}
|
