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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.MotionEvent;
import android.view.View;
import android.webkit.WebView;
import java.util.Map;
/**
* Manage WebView scroll events
*/
public class ScrollWebView extends WebView implements Runnable {
private ScrollListener mScrollListener;
private boolean mIsCancelled;
private boolean mBackgroundRemoved = false;
private boolean mUserInitiated = false;
/**
* @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);
}
// scroll runnable implementation
public void run() {
if (!mIsCancelled && (mScrollListener != null)) {
mScrollListener.onScroll(getVisibleTitleHeight(), mUserInitiated);
}
}
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(this);
}
}
@Override
public boolean onTouchEvent(MotionEvent evt) {
if (MotionEvent.ACTION_DOWN == evt.getActionMasked()) {
mUserInitiated = true;
} else if (MotionEvent.ACTION_UP == evt.getActionMasked()
|| (MotionEvent.ACTION_CANCEL == evt.getActionMasked())) {
mUserInitiated = false;
}
return super.onTouchEvent(evt);
}
@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(this);
} else {
mIsCancelled = false;
}
}
void setScrollListener(ScrollListener l) {
mScrollListener = l;
}
// callback for scroll events
interface ScrollListener {
public void onScroll(int visibleTitleHeight, boolean userInitiated);
}
@Override
protected void onDraw(android.graphics.Canvas c) {
super.onDraw(c);
if (!mBackgroundRemoved && getRootView().getBackground() != null) {
mBackgroundRemoved = true;
post(new Runnable() {
public void run() {
getRootView().setBackgroundDrawable(null);
}
});
}
}
}
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