AbsListViewDelegate.java

/*
 * Copyright 2013 Chris Banes
 *
 * 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.roboo.like.google.abs.ptr;

import com.roboo.like.google.views.helper.PullToRefreshHelper;

import android.view.View;
import android.widget.AbsListView;

public class AbsListViewDelegate extends PullToRefreshHelper.ViewDelegate
{
	/*** 支持ActionBar-PullToRefresh特性的View类 */
	public static final Class SUPPORTED_VIEW_CLASS = AbsListView.class;

	/** 支持的View是否滚动到顶部 */
	public boolean isScrolledToTop(View view)
	{
		AbsListView absListView = (AbsListView) view;
		if (absListView.getCount() == 0)//没有数据
		{
			return true;
		}
		else if (absListView.getFirstVisiblePosition() == 0)
		{
			final View firstVisibleChild = absListView.getChildAt(0);
			return firstVisibleChild != null && firstVisibleChild.getTop() >= 0;
		}
		return false;
	}
}