content: /**
   * Copyright 2016 Bartosz Schiller
   * <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.github.barteksc.pdfviewer.listener;
  
  import android.graphics.Canvas;
  
  /**
   * This interface allows an extern class to draw
   * something on the PDFView canvas, above all images.
   */
  public interface OnDrawListener {
  
      /**
       * This method is called when the PDFView is
       * drawing its view.
       * <p>
       * The page is starting at (0,0)
       *
       * @param canvas        The canvas on which to draw things.
       * @param pageWidth     The width of the current page.
       * @param pageHeight    The height of the current page.
       * @param displayedPage The current page index
       */
      void onLayerDrawn(Canvas canvas, float pageWidth, float pageHeight, int displayedPage);
  }
  