114 lines
3.2 KiB
Java
114 lines
3.2 KiB
Java
/*
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* Copyright (C) 2013 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 java.io.PrintWriter;
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import java.util.ArrayList;
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public class TaskStack {
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/** Unique identifier */
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final int mStackId;
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/** The display this stack sits under. */
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private final DisplayContent mDisplayContent;
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/** The Tasks that define this stack. Oldest Tasks are at the bottom. The ordering must match
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* mTaskHistory in the ActivityStack with the same mStackId */
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private ArrayList<Task> mTasks = new ArrayList<Task>();
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/** The StackBox this sits in. */
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private final StackBox mParent;
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TaskStack(int stackId, StackBox parent) {
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mStackId = stackId;
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mParent = parent;
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mDisplayContent = mParent.mDisplayContent;
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}
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DisplayContent getDisplayContent() {
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return mDisplayContent;
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}
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ArrayList<Task> getTasks() {
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return mTasks;
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}
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ArrayList<Task> merge(TaskStack stack) {
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ArrayList<Task> taskLists = stack.mTasks;
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taskLists.addAll(mTasks);
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mTasks = taskLists;
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return taskLists;
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}
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/**
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* Put a Task in this stack. Used for adding and moving.
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* @param task The task to add.
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* @param toTop Whether to add it to the top or bottom.
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*/
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void addTask(Task task, boolean toTop) {
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mParent.makeDirty();
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mTasks.add(toTop ? mTasks.size() : 0, task);
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mDisplayContent.moveStackBox(mStackId, toTop);
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}
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void moveTaskToTop(Task task) {
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mTasks.remove(task);
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addTask(task, true);
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}
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void moveTaskToBottom(Task task) {
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mTasks.remove(task);
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addTask(task, false);
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}
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/**
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* Delete a Task from this stack. If it is the last Task in the stack, remove this stack from
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* its parent StackBox and merge the parent.
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* @param task The Task to delete.
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* @return True if #task was in this stack.
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*/
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boolean removeTask(Task task) {
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mParent.makeDirty();
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if (mTasks.remove(task)) {
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if (mTasks.size() == 0) {
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mParent.removeStack();
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}
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return true;
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}
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return false;
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}
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int remove() {
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return mParent.removeStack();
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}
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int numTokens() {
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int count = 0;
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for (int taskNdx = mTasks.size() - 1; taskNdx >= 0; --taskNdx) {
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count += mTasks.get(taskNdx).mAppTokens.size();
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}
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return count;
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}
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public void dump(String prefix, PrintWriter pw) {
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pw.print(prefix); pw.print("mStackId="); pw.println(mStackId);
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for (int taskNdx = 0; taskNdx < mTasks.size(); ++taskNdx) {
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pw.print(prefix); pw.println(mTasks.get(taskNdx));
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}
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}
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}
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