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 */
16package android.text.method;
17
18import android.annotation.NonNull;
19import android.annotation.Nullable;
20import android.content.Context;
21import android.graphics.Rect;
22import android.text.Spanned;
23import android.text.TextUtils;
24import android.util.Log;
25import android.view.View;
26import android.widget.TextView;
27
28import java.util.Locale;
29
30/**
31 * Transforms source text into an ALL CAPS string, locale-aware.
32 *
33 * @hide
34 */
35public class AllCapsTransformationMethod implements TransformationMethod2 {
36    private static final String TAG = "AllCapsTransformationMethod";
37
38    private boolean mEnabled;
39    private Locale mLocale;
40
41    public AllCapsTransformationMethod(@NonNull Context context) {
42        mLocale = context.getResources().getConfiguration().getLocales().get(0);
43    }
44
45    @Override
46    public CharSequence getTransformation(@Nullable CharSequence source, View view) {
47        if (!mEnabled) {
48            Log.w(TAG, "Caller did not enable length changes; not transforming text");
49            return source;
50        }
51
52        if (source == null) {
53            return null;
54        }
55
56        Locale locale = null;
57        if (view instanceof TextView) {
58            locale = ((TextView)view).getTextLocale();
59        }
60        if (locale == null) {
61            locale = mLocale;
62        }
63        final boolean copySpans = source instanceof Spanned;
64        return TextUtils.toUpperCase(locale, source, copySpans);
65    }
66
67    @Override
68    public void onFocusChanged(View view, CharSequence sourceText, boolean focused, int direction,
69            Rect previouslyFocusedRect) {
70    }
71
72    @Override
73    public void setLengthChangesAllowed(boolean allowLengthChanges) {
74        mEnabled = allowLengthChanges;
75    }
76
77}
78