1/*
2 * Copyright (C) 2015 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.internal.widget;
18
19import android.text.InputFilter;
20import android.text.Spanned;
21import android.widget.TextView;
22
23/**
24 * Helper class to disable input on a TextView. The input is disabled by swapping in an InputFilter
25 * that discards all changes. Use with care if you have customized InputFilter on the target
26 * TextView.
27 */
28public class TextViewInputDisabler {
29    private TextView mTextView;
30    private InputFilter[] mDefaultFilters;
31    private InputFilter[] mNoInputFilters = new InputFilter[] {
32            new InputFilter () {
33                @Override
34                public CharSequence filter(CharSequence source, int start, int end, Spanned dest,
35                        int dstart, int dend) {
36                    return "";
37                }
38            }
39    };
40
41    public TextViewInputDisabler(TextView textView) {
42        mTextView = textView;
43        mDefaultFilters = mTextView.getFilters();
44    }
45
46    public void setInputEnabled(boolean enabled) {
47        mTextView.setFilters(enabled ? mDefaultFilters : mNoInputFilters);
48    }
49}
50