/*******************************************************************************
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* Copyright 2011, 2012 Chris Banes.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*******************************************************************************/
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package com.handmark.pulltorefresh.library;
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import android.annotation.TargetApi;
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import android.content.Context;
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import android.os.Build.VERSION;
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import android.os.Build.VERSION_CODES;
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import android.os.Bundle;
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import android.util.AttributeSet;
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import android.util.FloatMath;
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import android.webkit.WebChromeClient;
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import android.webkit.WebView;
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public class PullToRefreshWebView extends PullToRefreshBase<WebView> {
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private static final OnRefreshListener<WebView> defaultOnRefreshListener = new OnRefreshListener<WebView>() {
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@Override
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public void onRefresh(PullToRefreshBase<WebView> refreshView) {
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refreshView.getRefreshableView().reload();
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}
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};
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private final WebChromeClient defaultWebChromeClient = new WebChromeClient() {
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@Override
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public void onProgressChanged(WebView view, int newProgress) {
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if (newProgress == 100) {
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onRefreshComplete();
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}
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}
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};
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public PullToRefreshWebView(Context context) {
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super(context);
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/**
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* Added so that by default, Pull-to-Refresh refreshes the page
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*/
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setOnRefreshListener(defaultOnRefreshListener);
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mRefreshableView.setWebChromeClient(defaultWebChromeClient);
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}
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public PullToRefreshWebView(Context context, AttributeSet attrs) {
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super(context, attrs);
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/**
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* Added so that by default, Pull-to-Refresh refreshes the page
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*/
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setOnRefreshListener(defaultOnRefreshListener);
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mRefreshableView.setWebChromeClient(defaultWebChromeClient);
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}
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public PullToRefreshWebView(Context context, Mode mode) {
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super(context, mode);
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/**
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* Added so that by default, Pull-to-Refresh refreshes the page
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*/
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setOnRefreshListener(defaultOnRefreshListener);
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mRefreshableView.setWebChromeClient(defaultWebChromeClient);
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}
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public PullToRefreshWebView(Context context, Mode mode, AnimationStyle style) {
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super(context, mode, style);
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/**
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* Added so that by default, Pull-to-Refresh refreshes the page
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*/
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setOnRefreshListener(defaultOnRefreshListener);
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mRefreshableView.setWebChromeClient(defaultWebChromeClient);
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}
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@Override
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public final Orientation getPullToRefreshScrollDirection() {
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return Orientation.VERTICAL;
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}
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@Override
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protected WebView createRefreshableView(Context context, AttributeSet attrs) {
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WebView webView;
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if (VERSION.SDK_INT >= VERSION_CODES.GINGERBREAD) {
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webView = new InternalWebViewSDK9(context, attrs);
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} else {
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webView = new WebView(context, attrs);
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}
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webView.setId(R.id.webview);
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return webView;
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}
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@Override
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protected boolean isReadyForPullStart() {
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return mRefreshableView.getScrollY() == 0;
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}
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@Override
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protected boolean isReadyForPullEnd() {
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double exactContentHeight = Math.floor(mRefreshableView.getContentHeight() * mRefreshableView.getScale());
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return mRefreshableView.getScrollY() >= (exactContentHeight - mRefreshableView.getHeight());
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}
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@Override
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protected void onPtrRestoreInstanceState(Bundle savedInstanceState) {
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super.onPtrRestoreInstanceState(savedInstanceState);
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mRefreshableView.restoreState(savedInstanceState);
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}
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@Override
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protected void onPtrSaveInstanceState(Bundle saveState) {
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super.onPtrSaveInstanceState(saveState);
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mRefreshableView.saveState(saveState);
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}
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@TargetApi(9)
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final class InternalWebViewSDK9 extends WebView {
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// WebView doesn't always scroll back to it's edge so we add some
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// fuzziness
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static final int OVERSCROLL_FUZZY_THRESHOLD = 2;
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// WebView seems quite reluctant to overscroll so we use the scale
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// factor to scale it's value
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static final float OVERSCROLL_SCALE_FACTOR = 1.5f;
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public InternalWebViewSDK9(Context context, AttributeSet attrs) {
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super(context, attrs);
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}
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@Override
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protected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX,
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int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) {
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final boolean returnValue = super.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX,
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scrollRangeY, maxOverScrollX, maxOverScrollY, isTouchEvent);
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// Does all of the hard work...
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OverscrollHelper.overScrollBy(PullToRefreshWebView.this, deltaX, scrollX, deltaY, scrollY,
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getScrollRange(), OVERSCROLL_FUZZY_THRESHOLD, OVERSCROLL_SCALE_FACTOR, isTouchEvent);
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return returnValue;
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}
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private int getScrollRange() {
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return (int) Math.max(0, Math.floor(mRefreshableView.getContentHeight() * mRefreshableView.getScale())
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- (getHeight() - getPaddingBottom() - getPaddingTop()));
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}
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}
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}
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