content: /*
   * MIT License
   *
   * Copyright (c) 2016 Alibaba Group
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  
  package com.alibaba.android.vlayout.layout;
  
  import com.alibaba.android.vlayout.LayoutManagerHelper;
  
  /**
   * Absolute layout which only shows after scrolling to its' position,
   * it'll layout View based on leftMargin/topMargin/rightMargin/bottomMargin.
   *
   * @author villadora
   * @since 1.0.0
   */
  public class ScrollFixLayoutHelper extends FixLayoutHelper {
  
      private static final String TAG = "ScrollFixLayoutHelper";
  
  
      public static final int SHOW_ALWAYS = 0;
      public static final int SHOW_ON_ENTER = 1;
      public static final int SHOW_ON_LEAVE = 2;
  
  
      private int mShowType = SHOW_ALWAYS;
  
      public ScrollFixLayoutHelper(int x, int y) {
          this(TOP_LEFT, x, y);
      }
  
      public ScrollFixLayoutHelper(int alignType, int x, int y) {
          super(alignType, x, y);
      }
  
      public void setShowType(int showType) {
          this.mShowType = showType;
      }
  
      public int getShowType() {
          return mShowType;
      }
  
      @Override
      protected boolean shouldBeDraw(LayoutManagerHelper helper, int startPosition, int endPosition, int scrolled) {
          switch (mShowType) {
              case SHOW_ON_ENTER:
                  // when previous item is entering
                  return endPosition >= getRange().getLower() - 1;
              case SHOW_ON_LEAVE:
                  // show on leave from top
                  // when next item is the first one in screen
                  return startPosition >= getRange().getLower() + 1;
              case SHOW_ALWAYS:
              default:
                  // default is always
                  return true;
          }
  
      }
  
  }
  