Upstream printing changes.

android_webview/java/src/org/chromium/android_webview/AwPrintDocumentAdapter.java

Index: android_webview/java/src/org/chromium/android_webview/AwPrintDocumentAdapter.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwPrintDocumentAdapter.java b/android_webview/java/src/org/chromium/android_webview/AwPrintDocumentAdapter.java
new file mode 100644
index 0000000000000000000000000000000000000000..ecb2c8ad81e451790ca7e049b48f34abda847985
--- /dev/null
+++ b/android_webview/java/src/org/chromium/android_webview/AwPrintDocumentAdapter.java
@@ -0,0 +1,113 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.android_webview;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.os.CancellationSignal;
+import android.os.ParcelFileDescriptor;
+import android.print.PageRange;
+import android.print.PrintAttributes;
+import android.print.PrintDocumentAdapter;
+import android.print.PrintDocumentInfo;
+
+import android.util.Log;
+
+import android.webkit.ValueCallback;
+
+
+/**
+ * Adapter for printing Webview. This class implements the abstract
+ * system class PrintDocumentAdapter and hides all printing details from
+ * the developer.
+ */
+public class AwPrintDocumentAdapter extends PrintDocumentAdapter {
+
+    private static final String TAG = "AwPrintDocumentAdapter";
+
+    private AwPdfExporter mPdfExporter;
+    private PrintAttributes mAttributes;
+
+    /**
+     * Constructor.
+     *
+     * @param pdfExporter The PDF exporter to export the webview contents to a PDF file.
+     */
+    public AwPrintDocumentAdapter(AwPdfExporter pdfExporter) {
+        mPdfExporter = pdfExporter;
+    }
+
+    @Override
+    public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes,
+            CancellationSignal cancellationSignal, LayoutResultCallback callback,
+            Bundle metadata) {
+        mAttributes = newAttributes;
+        // TODO(sgurun) pass a meaningful string once b/10705082 is resolved
+        PrintDocumentInfo documentInfo = new PrintDocumentInfo
+                .Builder("webview")
+                .build();
+        // TODO(sgurun) once componentization is done, do layout changes and
+        // generate PDF here, set the page range information to documentinfo
+        // and call onLayoutFinished with true/false depending on whether
+        // layout actually changed.
+        callback.onLayoutFinished(documentInfo, true);
+    }
+
+    @Override
+    public void onWrite(PageRange[] pages, ParcelFileDescriptor destination,
+            CancellationSignal cancellationSignal, WriteResultCallback callback) {
+        // TODO(sgurun) sometimes we receive spurious onWrite. ignore it.
+        if (mAttributes.getMediaSize() == null) {
+            throw new  IllegalArgumentException("attributes must specify a media size");
+        }
+        if (mAttributes.getResolution() == null) {
+            throw new IllegalArgumentException("attributes must specify print resolution");
+        }
+        if (mAttributes.getMinMargins() == null) {
+            throw new IllegalArgumentException("attributes must specify margins");
+        }
+        // TODO(sgurun) get rid of AwPdfExportAttributes after upstreaming
+        // and move this logic to AwPdfExporter
+        AwPdfExportAttributes pdfAttributes = new AwPdfExportAttributes();
+        pdfAttributes.pageWidth = mAttributes.getMediaSize().getWidthMils();
+        pdfAttributes.pageHeight = mAttributes.getMediaSize().getHeightMils();
+        pdfAttributes.dpi = getPrintDpi(mAttributes);
+        pdfAttributes.leftMargin = mAttributes.getMinMargins().getLeftMils();
+        pdfAttributes.rightMargin = mAttributes.getMinMargins().getRightMils();
+        pdfAttributes.topMargin = mAttributes.getMinMargins().getTopMils();
+        pdfAttributes.bottomMargin = mAttributes.getMinMargins().getBottomMils();
+        exportPdf(destination, pdfAttributes, cancellationSignal, callback);
+    }
+
+    private static int getPrintDpi(PrintAttributes attributes) {
+        // TODO(sgurun) android print attributes support horizontal and
+        // vertical DPI. Chrome has only one DPI. Revisit this.
+        int horizontalDpi = attributes.getResolution().getHorizontalDpi();
+        int verticalDpi = attributes.getResolution().getVerticalDpi();
+        if (horizontalDpi != verticalDpi) {
+            Log.w(TAG, "Horizontal and vertical DPIs differ. Using horizontal DPI " +
+                    " hDpi=" + horizontalDpi + " vDPI=" + verticalDpi);
+        }
+        return horizontalDpi;
+    }
+
+    private void exportPdf(final ParcelFileDescriptor destination,
+            final AwPdfExportAttributes attributes,
+            final CancellationSignal signal,
+            final WriteResultCallback callback) {
+        mPdfExporter.exportToPdf(destination, attributes, new ValueCallback<Boolean>() {
+                    @Override
+                    public void onReceiveValue(Boolean value) {
+                        if (value) {
+                            callback.onWriteFinished(new PageRange[] {PageRange.ALL_PAGES});
+                        } else {
+                            // TODO(sgurun) localized error message
+                            callback.onWriteFailed(null);
+                        }
+                    }
+                }, signal);
+    }
+}
+