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/*
* Copyright (C) 2021 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.widget;
import android.annotation.NonNull;
import android.text.method.TranslationTransformationMethod;
import android.util.Log;
import android.view.View;
import android.view.translation.UiTranslationManager;
import android.view.translation.ViewTranslationCallback;
import android.view.translation.ViewTranslationResponse;
/**
* Default implementation for {@link ViewTranslationCallback} for {@link TextView} components.
* This class handles how to display the translated information for {@link TextView}.
*
* @hide
*/
public class TextViewTranslationCallback implements ViewTranslationCallback {
private static final String TAG = "TextViewTranslationCallback";
private static final boolean DEBUG = Log.isLoggable(UiTranslationManager.LOG_TAG, Log.DEBUG);
private TranslationTransformationMethod mTranslationTransformation;
/**
* Invoked by the platform when receiving the successful {@link ViewTranslationResponse} for the
* view that provides the translatable information by {@link View#createTranslationRequest} and
* sent by the platform.
*/
void setTranslationTransformation(TranslationTransformationMethod method) {
if (method == null) {
if (DEBUG) {
Log.w(TAG, "setTranslationTransformation: should not set null "
+ "TranslationTransformationMethod");
}
return;
}
mTranslationTransformation = method;
}
TranslationTransformationMethod getTranslationTransformation() {
return mTranslationTransformation;
}
private void clearTranslationTransformation() {
if (DEBUG) {
Log.v(TAG, "clearTranslationTransformation: " + mTranslationTransformation);
}
mTranslationTransformation = null;
}
/**
* {@inheritDoc}
*/
@Override
public boolean onShowTranslation(@NonNull View view) {
if (mTranslationTransformation != null) {
((TextView) view).setTransformationMethod(mTranslationTransformation);
} else {
if (DEBUG) {
// TODO(b/182433547): remove before S release
Log.w(TAG, "onShowTranslation(): no translated text.");
}
}
return true;
}
/**
* {@inheritDoc}
*/
@Override
public boolean onHideTranslation(@NonNull View view) {
// Restore to original text content.
if (mTranslationTransformation != null) {
((TextView) view).setTransformationMethod(
mTranslationTransformation.getOriginalTransformationMethod());
} else {
if (DEBUG) {
// TODO(b/182433547): remove before S release
Log.w(TAG, "onHideTranslation(): no translated text.");
}
}
return true;
}
/**
* {@inheritDoc}
*/
@Override
public boolean onClearTranslation(@NonNull View view) {
// Restore to original text content and clear TranslationTransformation
if (mTranslationTransformation != null) {
((TextView) view).setTransformationMethod(
mTranslationTransformation.getOriginalTransformationMethod());
clearTranslationTransformation();
} else {
if (DEBUG) {
// TODO(b/182433547): remove before S release
Log.w(TAG, "onClearTranslation(): no translated text.");
}
}
return true;
}
}
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