content: /*******************************************************************************
   * Copyright 2011, 2012 Chris Banes.
   * <p/>
   * 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
   * <p/>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p/>
   * 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.Handler;
  import android.os.Message;
  import android.util.AttributeSet;
  import android.util.Log;
  import android.view.View;
  import android.widget.ScrollView;
  
  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;
          }
      }
  }
  