TwoStateImageView.java revision 10bec48e17fadbd2bff744ba758e4782b64e0e2d 
1/*
2 * Copyright (C) 2011 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
17package com.android.camera.ui;
18
19import android.content.Context;
20import android.util.AttributeSet;
21import android.widget.ImageView;
22
23/**
24 * A @{code ImageView} which change the opacity of the icon if disabled.
25 */
26public class TwoStateImageView extends ImageView {
27    private static final int ENABLED_ALPHA = 255;
28    private static final int DISABLED_ALPHA = (int) (255 * 0.4);
29    private boolean mFilterEnabled = true;
30
31    public TwoStateImageView(Context context, AttributeSet attrs) {
32        super(context, attrs);
33    }
34
35    public TwoStateImageView(Context context) {
36        this(context, null);
37    }
38
39    @SuppressWarnings("deprecation")
40    @Override
41    public void setEnabled(boolean enabled) {
42        super.setEnabled(enabled);
43        if (mFilterEnabled) {
44            if (enabled) {
45                setAlpha(ENABLED_ALPHA);
46            } else {
47                setAlpha(DISABLED_ALPHA);
48            }
49        }
50    }
51
52    public void enableFilter(boolean enabled) {
53        mFilterEnabled = enabled;
54    }
55}
56