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/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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.android.browser;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.webkit.WebView;
import java.util.Map;
/**
* Manage WebView scroll events
*/
public class ScrollWebView extends WebView {
private ScrollListener mScrollListener;
private boolean mIsCancelled;
private Runnable mScrollRunnable;
/**
* @param context
* @param attrs
* @param defStyle
* @param javascriptInterfaces
*/
public ScrollWebView(Context context, AttributeSet attrs, int defStyle,
Map<String, Object> javascriptInterfaces, boolean privateBrowsing) {
super(context, attrs, defStyle, javascriptInterfaces, privateBrowsing);
}
/**
* @param context
* @param attrs
* @param defStyle
*/
public ScrollWebView(Context context, AttributeSet attrs, int defStyle,
boolean privateBrowsing) {
super(context, attrs, defStyle, privateBrowsing);
}
/**
* @param context
* @param attrs
*/
public ScrollWebView(Context context, AttributeSet attrs) {
super(context, attrs);
}
/**
* @param context
*/
public ScrollWebView(Context context) {
super(context);
}
void hideEmbeddedTitleBar() {
scrollBy(0, getVisibleTitleHeight());
}
@Override
public void setEmbeddedTitleBar(final View title) {
super.setEmbeddedTitleBar(title);
if (title != null && mScrollListener != null) {
// allow the scroll listener to initialize its state
post(new Runnable() {
@Override
public void run() {
mScrollListener.onScroll((title.getHeight() == 0 ||
getVisibleTitleHeight() > 0));
}
});
}
}
@Override
public void stopScroll() {
mIsCancelled = true;
super.stopScroll();
}
@Override
protected void onScrollChanged(int l, final int t, int ol, int ot) {
super.onScrollChanged(l, t, ol, ot);
if (!mIsCancelled) {
post(mScrollRunnable);
} else {
mIsCancelled = false;
}
}
void setScrollListener(ScrollListener l) {
mScrollListener = l;
if (mScrollListener != null) {
mScrollRunnable = new Runnable() {
public void run() {
if (!mIsCancelled) {
mScrollListener.onScroll(getVisibleTitleHeight() > 0);
}
}
};
}
}
// callback for scroll events
interface ScrollListener {
public void onScroll(boolean titleVisible);
}
}
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