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