org.dmfs.tasks.widget.ListenableScrollView.java Source code

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Here is the source code for org.dmfs.tasks.widget.ListenableScrollView.java

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/*
 * Copyright (C) 2014 Marten Gajda <marten@dmfs.org>
 *
 * 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 org.dmfs.tasks.widget;

import android.content.Context;
import android.support.v4.widget.NestedScrollView;
import android.util.AttributeSet;
import android.widget.ScrollView;

/**
 * Just a {@link ScrollView} that can notify a listener when the user scrolls.
 * <p />
 * TODO: get rid of it once the editor is refactored.
 * 
 * @author Marten Gajda <marten@dmfs.org>
 */
public class ListenableScrollView extends NestedScrollView {

    public interface OnScrollListener {
        /**
         * Called when the user scrolls the view.
         * 
         * @param oldScrollY
         *            The previous scroll position.
         * @param newScrollY
         *            The new scroll position.
         */
        public void onScroll(int oldScrollY, int newScrollY);
    }

    public ListenableScrollView(Context context) {
        super(context);
    }

    public ListenableScrollView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public ListenableScrollView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    private OnScrollListener mScrollListener;

    @Override
    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
        super.onScrollChanged(l, t, oldl, oldt);
        if (mScrollListener != null) {
            mScrollListener.onScroll(oldt, t);
        }
    }

    public void setOnScrollListener(OnScrollListener listener) {
        mScrollListener = listener;
    }
}