/*
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* Copyright (C) 2016 The Android Open Source Project
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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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package com.android.server.wm;
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import android.content.res.Configuration;
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/**
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* Class that allows the owner/creator of a {@link WindowContainer} to communicate directly with the
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* container and make changes.
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* Note that public calls (mostly in sub-classes) into this class are assumed to be originating from
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* outside the window manager so the window manager lock is held and appropriate permissions are
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* checked before calls are allowed to proceed.
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*
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* Test class: {@link WindowContainerControllerTests}
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*/
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class WindowContainerController<E extends WindowContainer, I extends WindowContainerListener>
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implements ConfigurationContainerListener {
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final WindowManagerService mService;
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final RootWindowContainer mRoot;
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final WindowManagerGlobalLock mGlobalLock;
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// The window container this controller owns.
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E mContainer;
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// Interface for communicating changes back to the owner.
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final I mListener;
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WindowContainerController(I listener, WindowManagerService service) {
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mListener = listener;
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mService = service;
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mRoot = mService != null ? mService.mRoot : null;
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mGlobalLock = mService != null ? mService.mGlobalLock : null;
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}
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void setContainer(E container) {
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if (mContainer != null && container != null) {
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throw new IllegalArgumentException("Can't set container=" + container
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+ " for controller=" + this + " Already set to=" + mContainer);
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}
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mContainer = container;
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if (mContainer != null && mListener != null) {
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mListener.registerConfigurationChangeListener(this);
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}
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}
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void removeContainer() {
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// TODO: See if most uses cases should support removeIfPossible here.
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//mContainer.removeIfPossible();
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if (mContainer == null) {
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return;
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}
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mContainer.setController(null);
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mContainer = null;
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if (mListener != null) {
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mListener.unregisterConfigurationChangeListener(this);
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}
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}
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@Override
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public void onRequestedOverrideConfigurationChanged(Configuration overrideConfiguration) {
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synchronized (mGlobalLock) {
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if (mContainer == null) {
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return;
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}
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mContainer.onRequestedOverrideConfigurationChanged(overrideConfiguration);
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}
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}
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}
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