141 lines
4.8 KiB
Java
Executable File
141 lines
4.8 KiB
Java
Executable File
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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package org.chromium.android_webview;
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import android.os.CancellationSignal;
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import android.os.ParcelFileDescriptor;
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import android.print.PrintAttributes;
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import android.util.Log;
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import android.view.ViewGroup;
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import android.webkit.ValueCallback;
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import org.chromium.base.CalledByNative;
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import org.chromium.base.JNINamespace;
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/**
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* Export the android webview as a PDF.
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* @TODO(sgurun) explain the ownership of this class and its native counterpart
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*/
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@JNINamespace("android_webview")
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public class AwPdfExporter {
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private static final String TAG = "AwPdfExporter";
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private long mNativeAwPdfExporter;
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// TODO(sgurun) result callback should return an int/object indicating errors.
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// potential errors: invalid print parameters, already pending, IO error
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private ValueCallback<Boolean> mResultCallback;
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private PrintAttributes mAttributes;
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private ParcelFileDescriptor mFd;
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// Maintain a reference to the top level object (i.e. WebView) since in a common
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// use case (offscreen webview) application may expect the framework's print manager
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// to own the Webview (via PrintDocumentAdapter).
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private final ViewGroup mContainerView;
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AwPdfExporter(ViewGroup containerView) {
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mContainerView = containerView;
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}
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public void exportToPdf(final ParcelFileDescriptor fd, PrintAttributes attributes,
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ValueCallback<Boolean> resultCallback, CancellationSignal cancellationSignal) {
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if (fd == null) {
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throw new IllegalArgumentException("fd cannot be null");
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}
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if (resultCallback == null) {
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throw new IllegalArgumentException("resultCallback cannot be null");
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}
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if (mResultCallback != null) {
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throw new IllegalStateException("printing is already pending");
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}
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if (attributes.getMediaSize() == null) {
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throw new IllegalArgumentException("attributes must specify a media size");
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}
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if (attributes.getResolution() == null) {
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throw new IllegalArgumentException("attributes must specify print resolution");
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}
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if (attributes.getMinMargins() == null) {
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throw new IllegalArgumentException("attributes must specify margins");
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}
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if (mNativeAwPdfExporter == 0) {
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resultCallback.onReceiveValue(false);
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return;
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}
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mResultCallback = resultCallback;
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mAttributes = attributes;
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mFd = fd;
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nativeExportToPdf(mNativeAwPdfExporter, mFd.getFd(), cancellationSignal);
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}
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@CalledByNative
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private void setNativeAwPdfExporter(int nativePdfExporter) {
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mNativeAwPdfExporter = nativePdfExporter;
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// Handle the cornercase that Webview.Destroy is called before the native side
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// has a chance to complete the pdf exporting.
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if (nativePdfExporter == 0 && mResultCallback != null) {
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mResultCallback.onReceiveValue(false);
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mResultCallback = null;
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}
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}
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private static int getPrintDpi(PrintAttributes attributes) {
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// TODO(sgurun) android print attributes support horizontal and
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// vertical DPI. Chrome has only one DPI. Revisit this.
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int horizontalDpi = attributes.getResolution().getHorizontalDpi();
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int verticalDpi = attributes.getResolution().getVerticalDpi();
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if (horizontalDpi != verticalDpi) {
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Log.w(TAG, "Horizontal and vertical DPIs differ. Using horizontal DPI " +
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" hDpi=" + horizontalDpi + " vDPI=" + verticalDpi);
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}
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return horizontalDpi;
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}
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@CalledByNative
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private void didExportPdf(boolean success) {
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mResultCallback.onReceiveValue(success);
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mResultCallback = null;
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mAttributes = null;
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// The caller should close the file.
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mFd = null;
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}
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@CalledByNative
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private int getPageWidth() {
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return mAttributes.getMediaSize().getWidthMils();
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}
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@CalledByNative
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private int getPageHeight() {
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return mAttributes.getMediaSize().getHeightMils();
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}
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@CalledByNative
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private int getDpi() {
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return getPrintDpi(mAttributes);
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}
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@CalledByNative
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private int getLeftMargin() {
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return mAttributes.getMinMargins().getLeftMils();
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}
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@CalledByNative
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private int getRightMargin() {
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return mAttributes.getMinMargins().getRightMils();
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}
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@CalledByNative
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private int getTopMargin() {
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return mAttributes.getMinMargins().getTopMils();
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}
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@CalledByNative
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private int getBottomMargin() {
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return mAttributes.getMinMargins().getBottomMils();
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}
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private native void nativeExportToPdf(long nativeAwPdfExporter, int fd,
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CancellationSignal cancellationSignal);
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}
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