/*******************************************************************************
* 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.util.AttributeSet;
import android.view.View;
import android.widget.ScrollView;
import com.desmond.libs.R;
public class PullToRefreshScrollView extends PullToRefreshBase<ScrollView> {
public PullToRefreshScrollView(Context context) {
super(context);
}
public PullToRefreshScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public PullToRefreshScrollView(Context context, Mode mode) {
super(context, mode);
}
public PullToRefreshScrollView(Context context, Mode mode, AnimationStyle style) {
super(context, mode, style);
}
@Override
public final Orientation getPullToRefreshScrollDirection() {
return Orientation.VERTICAL;
}
@Override
protected ScrollView createRefreshableView(Context context, AttributeSet attrs) {
ScrollView scrollView;
if (VERSION.SDK_INT >= VERSION_CODES.GINGERBREAD) {
scrollView = new InternalScrollViewSDK9(context, attrs);
} else {
scrollView = new ScrollView(context, attrs);
}
scrollView.setId(R.id.scrollview);
return scrollView;
}
@Override
protected boolean isReadyForPullStart() {
return mRefreshableView.getScrollY() == 0;
}
@Override
protected boolean isReadyForPullEnd() {
View scrollViewChild = mRefreshableView.getChildAt(0);
if (null != scrollViewChild) {
return mRefreshableView.getScrollY() >= (scrollViewChild.getHeight() - getHeight());
}
return false;
}
@TargetApi(9)
final class InternalScrollViewSDK9 extends ScrollView {
public InternalScrollViewSDK9(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(PullToRefreshScrollView.this, deltaX, scrollX, deltaY, scrollY,
getScrollRange(), isTouchEvent);
return returnValue;
}
/**
* Taken from the AOSP ScrollView source
*/
private int getScrollRange() {
int scrollRange = 0;
if (getChildCount() > 0) {
View child = getChildAt(0);
scrollRange = Math.max(0, child.getHeight() - (getHeight() - getPaddingBottom() - getPaddingTop()));
}
return scrollRange;
}
}
}