1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5 * use this file except in compliance with the License. You may obtain a copy of
6 * the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations under
14 * the License.
15 */
16
17package com.android.inputmethod.keyboard.internal;
18
19import com.android.inputmethod.keyboard.PointerTracker;
20
21import java.util.LinkedList;
22
23public class PointerTrackerQueue {
24    private final LinkedList<PointerTracker> mQueue = new LinkedList<PointerTracker>();
25
26    public synchronized void add(PointerTracker tracker) {
27        mQueue.add(tracker);
28    }
29
30    public synchronized void releaseAllPointersOlderThan(PointerTracker tracker, long eventTime) {
31        if (mQueue.lastIndexOf(tracker) < 0) {
32            return;
33        }
34        final LinkedList<PointerTracker> queue = mQueue;
35        int oldestPos = 0;
36        for (PointerTracker t = queue.get(oldestPos); t != tracker; t = queue.get(oldestPos)) {
37            if (t.isModifier()) {
38                oldestPos++;
39            } else {
40                t.onPhantomUpEvent(t.getLastX(), t.getLastY(), eventTime);
41                queue.remove(oldestPos);
42            }
43        }
44    }
45
46    public void releaseAllPointers(long eventTime) {
47        releaseAllPointersExcept(null, eventTime);
48    }
49
50    public synchronized void releaseAllPointersExcept(PointerTracker tracker, long eventTime) {
51        for (PointerTracker t : mQueue) {
52            if (t == tracker) {
53                continue;
54            }
55            t.onPhantomUpEvent(t.getLastX(), t.getLastY(), eventTime);
56        }
57        mQueue.clear();
58        if (tracker != null) {
59            mQueue.add(tracker);
60        }
61    }
62
63    public synchronized void remove(PointerTracker tracker) {
64        mQueue.remove(tracker);
65    }
66
67    public synchronized boolean isAnyInSlidingKeyInput() {
68        for (final PointerTracker tracker : mQueue) {
69            if (tracker.isInSlidingKeyInput()) {
70                return true;
71            }
72        }
73        return false;
74    }
75
76    @Override
77    public String toString() {
78        StringBuilder sb = new StringBuilder("[");
79        for (PointerTracker tracker : mQueue) {
80            if (sb.length() > 1)
81                sb.append(" ");
82            sb.append(String.format("%d", tracker.mPointerId));
83        }
84        sb.append("]");
85        return sb.toString();
86    }
87}
88