ConversationWebView.java revision b334c9035e9b7a38766bb66c29da2208525d1e11 
1/*
2 * Copyright (C) 2012 Google Inc.
3 * Licensed to The Android Open Source Project.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *      http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18package com.android.mail.browse;
19
20import android.content.Context;
21import android.util.AttributeSet;
22import android.view.MotionEvent;
23import android.webkit.WebView;
24
25import com.android.mail.utils.LogTag;
26import com.android.mail.utils.LogUtils;
27
28import java.util.Set;
29import java.util.concurrent.CopyOnWriteArraySet;
30
31public class ConversationWebView extends WebView implements ScrollNotifier {
32
33    private final Set<ScrollListener> mScrollListeners =
34            new CopyOnWriteArraySet<ScrollListener>();
35
36    /**
37     * True when WebView is handling a touch-- in between POINTER_DOWN and
38     * POINTER_UP/POINTER_CANCEL.
39     */
40    private boolean mHandlingTouch;
41
42    private static final String LOG_TAG = LogTag.getLogTag();
43
44    public ConversationWebView(Context c) {
45        this(c, null);
46    }
47
48    public ConversationWebView(Context c, AttributeSet attrs) {
49        super(c, attrs);
50    }
51
52    @Override
53    public void addScrollListener(ScrollListener l) {
54        mScrollListeners.add(l);
55    }
56
57    @Override
58    public void removeScrollListener(ScrollListener l) {
59        mScrollListeners.remove(l);
60    }
61
62    @Override
63    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
64        super.onScrollChanged(l, t, oldl, oldt);
65
66        for (ScrollListener listener : mScrollListeners) {
67            listener.onNotifierScroll(l, t);
68        }
69    }
70
71    @Override
72    public boolean onTouchEvent(MotionEvent ev) {
73        final int action = ev.getActionMasked();
74
75        switch (action) {
76            case MotionEvent.ACTION_DOWN:
77                mHandlingTouch = true;
78                break;
79            case MotionEvent.ACTION_POINTER_DOWN:
80                LogUtils.d(LOG_TAG, "WebView disabling intercepts: POINTER_DOWN");
81                requestDisallowInterceptTouchEvent(true);
82                break;
83            case MotionEvent.ACTION_CANCEL:
84            case MotionEvent.ACTION_UP:
85                mHandlingTouch = false;
86                break;
87        }
88
89        return super.onTouchEvent(ev);
90    }
91
92    public boolean isHandlingTouch() {
93        return mHandlingTouch;
94    }
95
96}
97