| /* |
| * 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 com.android.wallpaper.picker; |
| |
| import android.app.Activity; |
| import android.os.Bundle; |
| import android.view.View; |
| |
| import androidx.annotation.NonNull; |
| import androidx.annotation.Nullable; |
| import androidx.fragment.app.Fragment; |
| |
| import com.android.wallpaper.widget.BottomActionBar; |
| import com.android.wallpaper.widget.BottomActionBar.BottomActionBarHost; |
| |
| /** |
| * Base class for Fragments that own a {@link BottomActionBar} widget. |
| * |
| * A Fragment extending this class is expected to have a {@link BottomActionBar} in its activity |
| * which is a {@link BottomActionBarHost}, which can handle lifecycle management of |
| * {@link BottomActionBar} for extending fragment. |
| */ |
| public class BottomActionBarFragment extends Fragment { |
| |
| private BottomActionBar mBottomActionBar; |
| |
| @Override |
| public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) { |
| super.onViewCreated(view, savedInstanceState); |
| Activity activity = getActivity(); |
| if (activity instanceof BottomActionBarHost) { |
| mBottomActionBar = ((BottomActionBarHost) activity).getBottomActionBar(); |
| mBottomActionBar.bindBackButtonToSystemBackKey(activity); |
| onBottomActionBarReady(mBottomActionBar); |
| } |
| } |
| |
| @Override |
| public void onDestroyView() { |
| if (mBottomActionBar != null) { |
| mBottomActionBar.reset(); |
| mBottomActionBar = null; |
| } |
| super.onDestroyView(); |
| } |
| |
| /** Returns {@code true} if the fragment would handle the event. */ |
| public boolean onBackPressed() { |
| if (mBottomActionBar != null && mBottomActionBar.isVisible()) { |
| mBottomActionBar.hide(); |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * Gets called when {@link #onViewCreated} finished. For extending fragment, this is the only |
| * one interface to get {@link BottomActionBar}. |
| */ |
| protected void onBottomActionBarReady(BottomActionBar bottomActionBar) {} |
| } |