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 */ AwPrintDocumentAdapter(AwPdfExporter pdfExporter)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 */ AwPrintDocumentAdapter(AwPdfExporter pdfExporter, String documentName)44 public AwPrintDocumentAdapter(AwPdfExporter pdfExporter, String documentName) { 45 mPdfExporter = pdfExporter; 46 mDocumentName = documentName; 47 } 48 49 50 @Override onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes, CancellationSignal cancellationSignal, LayoutResultCallback callback, Bundle metadata)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 onWrite(PageRange[] pages, ParcelFileDescriptor destination, CancellationSignal cancellationSignal, final WriteResultCallback callback)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