content: package com.github.barteksc.pdfviewer.scroll;
  
  import com.github.barteksc.pdfviewer.PDFView;
  
  public interface ScrollHandle {
  
      /**
       * Used to move the handle, called internally by PDFView
       *
       * @param position current scroll ratio between 0 and 1
       */
      void setScroll(float position);
  
      /**
       * Method called by PDFView after setting scroll handle.
       * Do not call this method manually.
       * For usage sample see {@link DefaultScrollHandle}
       *
       * @param pdfView PDFView instance
       */
      void setupLayout(PDFView pdfView);
  
      /**
       * Method called by PDFView when handle should be removed from layout
       * Do not call this method manually.
       */
      void destroyLayout();
  
      /**
       * Set page number displayed on handle
       *
       * @param pageNum page number
       */
      void setPageNum(int pageNum);
  
      /**
       * Get handle visibility
       *
       * @return true if handle is visible, false otherwise
       */
      boolean shown();
  
      /**
       * Show handle
       */
      void show();
  
      /**
       * Hide handle immediately
       */
      void hide();
  
      /**
       * Hide handle after some time (defined by implementation)
       */
      void hideDelayed();
  }
  