Android Open Source - PatternAndroid Pull To Refresh Scroll View

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MIT License

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Java Source Code

/*******************************************************************************
 * Copyright 2011, 2012 Chris Banes.//w  w w . j a v a  2 s .  c  om
 *
 * 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;

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;
    }
  }
}

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