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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 package org.chromium.android_webview;
      6 
      7 import android.os.Bundle;
      8 import android.os.CancellationSignal;
      9 import android.os.ParcelFileDescriptor;
     10 import android.print.PageRange;
     11 import android.print.PrintAttributes;
     12 import android.print.PrintDocumentAdapter;
     13 import android.print.PrintDocumentInfo;
     14 import android.webkit.ValueCallback;
     15 
     16 
     17 /**
     18  * Adapter for printing Webview. This class implements the abstract
     19  * system class PrintDocumentAdapter and hides all printing details from
     20  * the developer.
     21  */
     22 public class AwPrintDocumentAdapter extends PrintDocumentAdapter {
     23 
     24     private AwPdfExporter mPdfExporter;
     25     private PrintAttributes mAttributes;
     26     private String mDocumentName;
     27 
     28     /**
     29      * Constructor.
     30      * TODO(sgurun) remove in favor of constructor below once the AOSP changes are in.
     31      *
     32      * @param pdfExporter The PDF exporter to export the webview contents to a PDF file.
     33      */
     34     public AwPrintDocumentAdapter(AwPdfExporter pdfExporter) {
     35         this(pdfExporter, "default");
     36     }
     37 
     38     /**
     39      * Constructor.
     40      *
     41      * @param pdfExporter The PDF exporter to export the webview contents to a PDF file.
     42      * @param documentName  The name of the pdf document.
     43      */
     44     public AwPrintDocumentAdapter(AwPdfExporter pdfExporter, String documentName) {
     45         mPdfExporter = pdfExporter;
     46         mDocumentName = documentName;
     47     }
     48 
     49 
     50     @Override
     51     public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes,
     52             CancellationSignal cancellationSignal, LayoutResultCallback callback,
     53             Bundle metadata) {
     54         mAttributes = newAttributes;
     55         PrintDocumentInfo documentInfo = new PrintDocumentInfo
     56                 .Builder(mDocumentName)
     57                 .build();
     58         // TODO(sgurun) once componentization is done, do layout changes and
     59         // generate PDF here, set the page range information to documentinfo
     60         // and call onLayoutFinished with true/false depending on whether
     61         // layout actually changed.
     62         callback.onLayoutFinished(documentInfo, true);
     63     }
     64 
     65     @Override
     66     public void onWrite(PageRange[] pages, ParcelFileDescriptor destination,
     67             CancellationSignal cancellationSignal, final WriteResultCallback callback) {
     68         mPdfExporter.exportToPdf(destination, mAttributes, new ValueCallback<Boolean>() {
     69             @Override
     70             public void onReceiveValue(Boolean value) {
     71                 if (value) {
     72                     callback.onWriteFinished(new PageRange[] { PageRange.ALL_PAGES });
     73                 } else {
     74                     // TODO(sgurun) provide a localized error message
     75                     callback.onWriteFailed(null);
     76                 }
     77             }
     78         }, cancellationSignal);
     79     }
     80 }
     81 
     82