256 lines
10 KiB
Java
256 lines
10 KiB
Java
/*
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* Copyright (c) 2015 RoboSwag (Gavriil Sitnikov, Vsevolod Ivanov)
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*
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* This file is part of RoboSwag library.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package ru.touchin.roboswag.components.navigation;
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import android.content.Context;
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import android.os.Bundle;
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import android.support.annotation.NonNull;
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import android.support.annotation.Nullable;
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import android.util.Pair;
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import android.view.LayoutInflater;
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import android.view.Menu;
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import android.view.MenuInflater;
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import android.view.MenuItem;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.FrameLayout;
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import java.io.Serializable;
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import java.lang.reflect.Constructor;
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import ru.touchin.roboswag.core.log.Lc;
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import ru.touchin.roboswag.core.utils.ShouldNotHappenException;
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import ru.touchin.roboswag.core.utils.android.RxAndroidUtils;
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import rx.Observable;
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import rx.Scheduler;
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import rx.Subscription;
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import rx.android.schedulers.AndroidSchedulers;
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import rx.exceptions.OnErrorThrowable;
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import rx.subjects.BehaviorSubject;
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/**
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* Created by Gavriil Sitnikov on 21/10/2015.
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* Fragment instantiated in specific activity of {@link TActivity} type that is holding {@link ViewController} inside.
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*/
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public abstract class ViewControllerFragment<TState extends Serializable, TLogicBridge, TActivity extends ViewControllerActivity<TLogicBridge>>
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extends ViewFragment<TActivity> {
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private static final String VIEW_CONTROLLER_STATE_EXTRA = "VIEW_CONTROLLER_STATE_EXTRA";
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/**
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* Creates {@link Bundle} which will store state.
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*
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* @param state State to use into ViewController.
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* @return Returns bundle with state inside.
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*/
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@NonNull
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public static Bundle createState(@Nullable final Serializable state) {
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final Bundle result = new Bundle();
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result.putSerializable(VIEW_CONTROLLER_STATE_EXTRA, state);
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return result;
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}
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private final BehaviorSubject<TActivity> activitySubject = BehaviorSubject.create();
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private final BehaviorSubject<Pair<ViewGroup, Bundle>> viewSubject = BehaviorSubject.create();
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private Scheduler backgroundScheduler;
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@Nullable
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private ViewController viewController;
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private Subscription viewControllerSubscription;
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private TState state;
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private final Observable<ViewController> viewControllerObservable = Observable
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.combineLatest(activitySubject
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.switchMap(activity -> activity != null ? activity.observeLogicBridge() : Observable.just(null))
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.distinctUntilChanged()
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.observeOn(backgroundScheduler),
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activitySubject.distinctUntilChanged().observeOn(backgroundScheduler),
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viewSubject.distinctUntilChanged().observeOn(backgroundScheduler),
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(logicBridge, activity, viewInfo) -> {
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if (logicBridge == null || activity == null || viewInfo == null) {
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return null;
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}
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final ViewController.CreationContext<TLogicBridge, TActivity,
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? extends ViewControllerFragment<TState, TLogicBridge, TActivity>> creationContext
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= new ViewController.CreationContext<>(logicBridge, activity, this, viewInfo.first);
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if (getViewControllerClass().getConstructors().length != 1) {
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throw OnErrorThrowable
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.from(new ShouldNotHappenException("There should be single constructor for " + getViewControllerClass()));
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}
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final Constructor<?> constructor = getViewControllerClass().getConstructors()[0];
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try {
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switch (constructor.getParameterTypes().length) {
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case 2:
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return (ViewController) constructor.newInstance(creationContext, viewInfo.second);
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case 3:
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return (ViewController) constructor.newInstance(this, creationContext, viewInfo.second);
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default:
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Lc.assertion("Wrong constructor parameters count: " + constructor.getParameterTypes().length);
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return null;
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}
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} catch (final Exception exception) {
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throw OnErrorThrowable.from(exception);
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}
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})
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.observeOn(AndroidSchedulers.mainThread());
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/**
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* Override it to enable inflation of view and creation of {@link ViewController} in background.
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*
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* @return Returns if it should do work in background. False by default.
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*/
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protected boolean isCreationInBackgroundEnabled() {
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return false;
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}
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/**
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* Returns specific object which contains state of ViewController.
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*
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* @return Object of TState type.
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*/
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public TState getState() {
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return state;
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}
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/**
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* It should return specific ViewController class to control instantiated view by logic bridge after activity creation.
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*
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* @return Returns class of specific ViewController.
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*/
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@NonNull
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public abstract Class<? extends ViewController<TLogicBridge, TActivity,
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? extends ViewControllerFragment<TState, TLogicBridge, TActivity>>> getViewControllerClass();
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@SuppressWarnings("unchecked")
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@Override
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public void onCreate(@Nullable final Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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if (getContext() == null) {
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Lc.assertion("Context is null in onCreate");
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return;
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}
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setHasOptionsMenu(getParentFragment() == null);
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state = savedInstanceState != null
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? (TState) savedInstanceState.getSerializable(VIEW_CONTROLLER_STATE_EXTRA)
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: (getArguments() != null ? (TState) getArguments().getSerializable(VIEW_CONTROLLER_STATE_EXTRA) : null);
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backgroundScheduler = isCreationInBackgroundEnabled() ? RxAndroidUtils.createLooperScheduler() : AndroidSchedulers.mainThread();
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viewControllerSubscription = viewControllerObservable.subscribe(this::onViewControllerChanged, Lc::assertion);
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}
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@Deprecated
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@NonNull
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@Override
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public View onCreateView(@NonNull final LayoutInflater inflater,
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@Nullable final ViewGroup container,
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@Nullable final Bundle savedInstanceState) {
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return new PlaceholderView(inflater.getContext());
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}
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@Override
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public void onViewCreated(@NonNull final View view, @Nullable final Bundle savedInstanceState) {
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super.onViewCreated(view, savedInstanceState);
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viewSubject.onNext(new Pair<>(new FrameLayout(view.getContext()), savedInstanceState));
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}
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@Override
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public void onActivityCreated(@NonNull final View view, @NonNull final TActivity activity, @Nullable final Bundle savedInstanceState) {
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super.onActivityCreated(view, activity, savedInstanceState);
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activitySubject.onNext(activity);
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}
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@Override
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public void onCreateOptionsMenu(@NonNull final Menu menu, @NonNull final MenuInflater inflater) {
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super.onCreateOptionsMenu(menu, inflater);
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if (viewController != null) {
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viewController.onConfigureNavigation(menu, inflater);
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}
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}
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@Override
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public boolean onOptionsItemSelected(@NonNull final MenuItem item) {
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return (viewController != null && viewController.onOptionsItemSelected(item)) || super.onOptionsItemSelected(item);
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}
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private void onViewControllerChanged(@Nullable final ViewController viewController) {
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if (this.viewController != null) {
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this.viewController.onDestroy();
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}
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this.viewController = viewController;
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if (this.viewController == null) {
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return;
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}
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if (!(getView() instanceof PlaceholderView)) {
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Lc.assertion("View of fragment should be PlaceholderView");
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return;
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}
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((PlaceholderView) getView()).removeAllViews();
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((PlaceholderView) getView())
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.addView(this.viewController.getContainer(), ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
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viewController.getActivity().supportInvalidateOptionsMenu();
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}
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@Override
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public void onSaveInstanceState(@NonNull final Bundle savedInstanceState) {
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super.onSaveInstanceState(savedInstanceState);
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if (viewController != null) {
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viewController.onSaveInstanceState(savedInstanceState);
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savedInstanceState.putSerializable(VIEW_CONTROLLER_STATE_EXTRA, state);
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} else if (getArguments() != null && getArguments().containsKey(VIEW_CONTROLLER_STATE_EXTRA)) {
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savedInstanceState.putSerializable(VIEW_CONTROLLER_STATE_EXTRA, getArguments().getSerializable(VIEW_CONTROLLER_STATE_EXTRA));
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}
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}
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@Override
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protected void onDestroyView(@NonNull final View view) {
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viewSubject.onNext(null);
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super.onDestroyView(view);
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}
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@Override
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public void onDetach() {
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activitySubject.onNext(null);
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super.onDetach();
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}
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@Override
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public void onDestroy() {
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viewControllerSubscription.unsubscribe();
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if (viewController != null && !viewController.isDestroyed()) {
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viewController.onDestroy();
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viewController = null;
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}
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super.onDestroy();
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}
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private static class PlaceholderView extends FrameLayout {
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public PlaceholderView(@NonNull final Context context) {
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super(context);
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}
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}
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}
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