PullToRefreshWebView.java

/*******************************************************************************
 * Copyright 2011, 2012 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.aincc.lib.ui.widget.list.pulltorefresh;

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

import com.aincc.lib.R;

public class PullToRefreshWebView extends PullToRefreshBase<WebView>
{

	private final OnRefreshListener defaultOnRefreshListener = new OnRefreshListener()
	{

		@Override
		public void onRefresh()
		{
			mRefreshableView.reload();
		}

	};

	private final WebChromeClient defaultWebChromeClient = new WebChromeClient()
	{

		@Override
		public void onProgressChanged(WebView view, int newProgress)
		{
			if (newProgress == 100)
			{
				onRefreshComplete();
			}
		}

	};

	public PullToRefreshWebView(Context context)
	{
		super(context);

		/**
		 * Added so that by default, Pull-to-Refresh refreshes the page
		 */
		setOnRefreshListener(defaultOnRefreshListener);
		mRefreshableView.setWebChromeClient(defaultWebChromeClient);
	}

	public PullToRefreshWebView(Context context, AttributeSet attrs)
	{
		super(context, attrs);

		/**
		 * Added so that by default, Pull-to-Refresh refreshes the page
		 */
		setOnRefreshListener(defaultOnRefreshListener);
		mRefreshableView.setWebChromeClient(defaultWebChromeClient);
	}

	public PullToRefreshWebView(Context context, Mode mode)
	{
		super(context, mode);

		/**
		 * Added so that by default, Pull-to-Refresh refreshes the page
		 */
		setOnRefreshListener(defaultOnRefreshListener);
		mRefreshableView.setWebChromeClient(defaultWebChromeClient);
	}

	@Override
	protected WebView createRefreshableView(Context context, AttributeSet attrs)
	{
		WebView webView = new WebView(context, attrs);

		webView.setId(R.id.webview);
		return webView;
	}

	@Override
	protected boolean isReadyForPullDown()
	{
		return mRefreshableView.getScrollY() == 0;
	}

	@Override
	protected boolean isReadyForPullUp()
	{
		float exactContentHeight = FloatMath.floor(mRefreshableView.getContentHeight() * mRefreshableView.getScale());
		return mRefreshableView.getScrollY() >= (exactContentHeight - mRefreshableView.getHeight());
	}
}