TaskGrouping.java revision 083baf99ff1228e96ede96aac88c8200c4fdc2b2 
1package com.android.systemui.recents.model;
2
3import java.util.ArrayList;
4import java.util.HashMap;
5
6/** Represents a grouping of tasks witihin a stack. */
7public class TaskGrouping {
8
9    int affiliation;
10    long latestActiveTimeInGroup;
11
12    Task.TaskKey mFrontMostTaskKey;
13    ArrayList<Task.TaskKey> mTaskKeys = new ArrayList<Task.TaskKey>();
14    HashMap<Task.TaskKey, Integer> mTaskKeyIndices = new HashMap<Task.TaskKey, Integer>();
15
16    /** Creates a group with a specified affiliation. */
17    public TaskGrouping(int affiliation) {
18        this.affiliation = affiliation;
19    }
20
21    /** Adds a new task to this group. */
22    void addTask(Task t) {
23        mTaskKeys.add(t.key);
24        if (t.key.lastActiveTime > latestActiveTimeInGroup) {
25            latestActiveTimeInGroup = t.key.lastActiveTime;
26        }
27        t.setGroup(this);
28        updateTaskIndices();
29    }
30
31    /** Removes a task from this group. */
32    void removeTask(Task t) {
33        mTaskKeys.remove(t.key);
34        latestActiveTimeInGroup = 0;
35        int taskCount = mTaskKeys.size();
36        for (int i = 0; i < taskCount; i++) {
37            long lastActiveTime = mTaskKeys.get(i).lastActiveTime;
38            if (lastActiveTime > latestActiveTimeInGroup) {
39                latestActiveTimeInGroup = lastActiveTime;
40            }
41        }
42        t.setGroup(null);
43        updateTaskIndices();
44    }
45
46    /** Gets the front task */
47    public boolean isFrontMostTask(Task t) {
48        return (t.key == mFrontMostTaskKey);
49    }
50
51    /** Finds the index of a given task in a group. */
52    public int indexOf(Task t) {
53        return mTaskKeyIndices.get(t.key);
54    }
55
56    /** Returns the number of tasks in this group. */
57    public int getTaskCount() { return mTaskKeys.size(); }
58
59    /** Updates the mapping of tasks to indices. */
60    private void updateTaskIndices() {
61        if (mTaskKeys.isEmpty()) {
62            mFrontMostTaskKey = null;
63            mTaskKeyIndices.clear();
64            return;
65        }
66
67        mFrontMostTaskKey = mTaskKeys.get(mTaskKeys.size() - 1);
68        mTaskKeyIndices.clear();
69        int taskCount = mTaskKeys.size();
70        for (int i = 0; i < taskCount; i++) {
71            Task.TaskKey k = mTaskKeys.get(i);
72            mTaskKeyIndices.put(k, i);
73        }
74    }
75}
76