src/com/android/mail/ui/ConversationWebView.java

/*
 * Copyright (C) 2012 Google Inc.
 * Licensed to 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.mail.ui;

import android.content.Context;
import android.util.AttributeSet;
import android.webkit.WebView;

import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;

public class ConversationWebView extends WebView implements ScrollNotifier {

    private final Set<ScrollListener> mScrollListeners =
            new CopyOnWriteArraySet<ScrollListener>();

    public ConversationWebView(Context c) {
        this(c, null);
    }

    public ConversationWebView(Context c, AttributeSet attrs) {
        super(c, attrs);
    }

    @Override
    public void addScrollListener(ScrollListener l) {
        mScrollListeners.add(l);
    }

    @Override
    public void removeScrollListener(ScrollListener l) {
        mScrollListeners.remove(l);
    }

    @Override
    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
        super.onScrollChanged(l, t, oldl, oldt);

        for (ScrollListener listener : mScrollListeners) {
            listener.onNotifierScroll(l, t);
        }
    }


}