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