CallbackWithHandler.java
/*
* Copyright 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 androidx.core.provider;
import static androidx.core.provider.FontsContractCompat.FontRequestCallback.FontRequestFailReason;
import android.graphics.Typeface;
import android.os.Handler;
import androidx.annotation.NonNull;
import androidx.core.provider.FontRequestWorker.TypefaceResult;
import androidx.core.provider.FontsContractCompat.FontRequestCallback;
/**
* Wraps a {@link FontRequestCallback} and a {@link Handler} in order to call the callback
* functions on the provided handler.
*
* If no Handler is provided, {@link CalleeHandler#create()} is used instead.
*/
class CallbackWithHandler {
@NonNull private final FontRequestCallback mCallback;
@NonNull private final Handler mCallbackHandler;
CallbackWithHandler(
@NonNull FontRequestCallback callback,
@NonNull Handler callbackHandler) {
this.mCallback = callback;
this.mCallbackHandler = callbackHandler;
}
CallbackWithHandler(@NonNull FontRequestCallback callback) {
this.mCallback = callback;
this.mCallbackHandler = CalleeHandler.create();
}
/**
* Mirrors {@link FontRequestCallback#onTypefaceRetrieved(Typeface)}
*/
private void onTypefaceRetrieved(@NonNull final Typeface typeface) {
final FontRequestCallback callback = this.mCallback;
mCallbackHandler.post(new Runnable() {
@Override
public void run() {
callback.onTypefaceRetrieved(typeface);
}
});
}
/**
* Mirrors {@link FontRequestCallback#onTypefaceRequestFailed(int)}
*/
private void onTypefaceRequestFailed(@FontRequestFailReason final int reason) {
final FontRequestCallback callback = this.mCallback;
mCallbackHandler.post(new Runnable() {
@Override
public void run() {
callback.onTypefaceRequestFailed(reason);
}
});
}
/**
* Utility function for TypefaceResult
*/
void onTypefaceResult(@NonNull TypefaceResult typefaceResult) {
if (typefaceResult.isSuccess()) {
onTypefaceRetrieved(typefaceResult.mTypeface);
} else {
onTypefaceRequestFailed(typefaceResult.mResult);
}
}
}