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/*
* Copyright (C) 2020 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 android.text.method;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.graphics.Rect;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.view.translation.TranslationResponseValue;
import android.view.translation.ViewTranslationRequest;
import android.view.translation.ViewTranslationResponse;
import android.widget.TextView;
import java.util.regex.Pattern;
/**
* Transforms source text into an translated string.
*
* @hide
*/
public class TranslationTransformationMethod implements TransformationMethod2 {
private static final String TAG = "TranslationTransformationMethod";
private static final Pattern PATTERN_WHITESPACE = Pattern.compile("\\s+");
@NonNull
private final ViewTranslationResponse mTranslationResponse;
@Nullable
private TransformationMethod mOriginalTranslationMethod;
private boolean mAllowLengthChanges;
/**
* @param response the translated result from translation service.
* @param method the {@link TextView}'s original {@link TransformationMethod}
*/
public TranslationTransformationMethod(@NonNull ViewTranslationResponse response,
@Nullable TransformationMethod method) {
mTranslationResponse = response;
mOriginalTranslationMethod = method;
}
/**
* Returns the {@link TextView}'s original {@link TransformationMethod}. This can be used to
* restore to show if the user pauses or finish the ui translation.
*/
public TransformationMethod getOriginalTransformationMethod() {
return mOriginalTranslationMethod;
}
/**
* Returns the {@link TextView}'s {@link ViewTranslationResponse}.
*/
public ViewTranslationResponse getViewTranslationResponse() {
return mTranslationResponse;
}
@Override
public CharSequence getTransformation(CharSequence source, View view) {
if (!mAllowLengthChanges) {
Log.w(TAG, "Caller did not enable length changes; not transforming to translated text");
return source;
}
TranslationResponseValue value = mTranslationResponse.getValue(
ViewTranslationRequest.ID_TEXT);
CharSequence translatedText;
if (value.getStatusCode() == TranslationResponseValue.STATUS_SUCCESS) {
translatedText = value.getText();
} else {
translatedText = "";
}
if (TextUtils.isEmpty(translatedText) || isWhitespace(translatedText.toString())) {
return source;
} else {
// TODO(b/174283799): apply the spans to the text
return translatedText;
}
}
@Override
public void onFocusChanged(View view, CharSequence sourceText,
boolean focused, int direction,
Rect previouslyFocusedRect) {
// do nothing
}
@Override
public void setLengthChangesAllowed(boolean allowLengthChanges) {
mAllowLengthChanges = allowLengthChanges;
}
private boolean isWhitespace(String text) {
return PATTERN_WHITESPACE.matcher(text.substring(0, text.length())).matches();
}
}
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