/*******************************************************************************
* 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.handmark.pulltorefresh.library;
import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.os.Bundle;
import android.util.AttributeSet;
import android.util.FloatMath;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import com.desmond.libs.R;
public class PullToRefreshWebView extends PullToRefreshBase<WebView> {
private static final OnRefreshListener<WebView> defaultOnRefreshListener = new OnRefreshListener<WebView>() {
@Override
public void onRefresh(PullToRefreshBase<WebView> refreshView) {
refreshView.getRefreshableView().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);
}
public PullToRefreshWebView(Context context, Mode mode, AnimationStyle style) {
super(context, mode, style);
/**
* Added so that by default, Pull-to-Refresh refreshes the page
*/
setOnRefreshListener(defaultOnRefreshListener);
mRefreshableView.setWebChromeClient(defaultWebChromeClient);
}
@Override
public final Orientation getPullToRefreshScrollDirection() {
return Orientation.VERTICAL;
}
@Override
protected WebView createRefreshableView(Context context, AttributeSet attrs) {
WebView webView;
if (VERSION.SDK_INT >= VERSION_CODES.GINGERBREAD) {
webView = new InternalWebViewSDK9(context, attrs);
} else {
webView = new WebView(context, attrs);
}
webView.setId(R.id.webview);
return webView;
}
@Override
protected boolean isReadyForPullStart() {
return mRefreshableView.getScrollY() == 0;
}
@Override
protected boolean isReadyForPullEnd() {
float exactContentHeight = (float) Math.floor(mRefreshableView.getContentHeight() * mRefreshableView.getScale());
return mRefreshableView.getScrollY() >= (exactContentHeight - mRefreshableView.getHeight());
}
@Override
protected void onPtrRestoreInstanceState(Bundle savedInstanceState) {
super.onPtrRestoreInstanceState(savedInstanceState);
mRefreshableView.restoreState(savedInstanceState);
}
@Override
protected void onPtrSaveInstanceState(Bundle saveState) {
super.onPtrSaveInstanceState(saveState);
mRefreshableView.saveState(saveState);
}
@TargetApi(9)
final class InternalWebViewSDK9 extends WebView {
// WebView doesn't always scroll back to it's edge so we add some
// fuzziness
static final int OVERSCROLL_FUZZY_THRESHOLD = 2;
// WebView seems quite reluctant to overscroll so we use the scale
// factor to scale it's value
static final float OVERSCROLL_SCALE_FACTOR = 1.5f;
public InternalWebViewSDK9(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX,
int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) {
final boolean returnValue = super.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX,
scrollRangeY, maxOverScrollX, maxOverScrollY, isTouchEvent);
// Does all of the hard work...
OverscrollHelper.overScrollBy(PullToRefreshWebView.this, deltaX, scrollX, deltaY, scrollY,
getScrollRange(), OVERSCROLL_FUZZY_THRESHOLD, OVERSCROLL_SCALE_FACTOR, isTouchEvent);
return returnValue;
}
private int getScrollRange() {
return (int) Math.max(0, Math.floor(mRefreshableView.getContentHeight() * mRefreshableView.getScale())
- (getHeight() - getPaddingBottom() - getPaddingTop()));
}
}
}