Implement window.print() on Android

chrome/android/java/src/org/chromium/chrome/browser/Tab.java

 // Copyright 2014 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.chrome.browser;
 
 import android.app.Activity;
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.Color;
+import android.util.Log;
 import android.view.ContextMenu;
 import android.view.View;
 
 import org.chromium.base.CalledByNative;
 import org.chromium.base.ObserverList;
 import org.chromium.base.TraceEvent;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.banners.AppBannerManager;
 import org.chromium.chrome.browser.contextmenu.ChromeContextMenuItemDelegate;
 import org.chromium.chrome.browser.contextmenu.ChromeContextMenuPopulator;
 import org.chromium.chrome.browser.contextmenu.ContextMenuParams;
 import org.chromium.chrome.browser.contextmenu.ContextMenuPopulator;
 import org.chromium.chrome.browser.contextmenu.ContextMenuPopulatorWrapper;
 import org.chromium.chrome.browser.contextmenu.EmptyChromeContextMenuItemDelegate;
 import org.chromium.chrome.browser.dom_distiller.DomDistillerFeedbackReporter;
 import org.chromium.chrome.browser.infobar.AutoLoginProcessor;
 import org.chromium.chrome.browser.infobar.InfoBarContainer;
+import org.chromium.chrome.browser.printing.TabPrinter;
 import org.chromium.chrome.browser.profiles.Profile;
 import org.chromium.chrome.browser.toolbar.ToolbarModel;
 import org.chromium.content.browser.ContentView;
 import org.chromium.content.browser.ContentViewClient;
 import org.chromium.content.browser.ContentViewCore;
 import org.chromium.content.browser.WebContentsObserver;
 import org.chromium.content_public.browser.LoadUrlParams;
 import org.chromium.content_public.browser.WebContents;
+import org.chromium.printing.PrintManagerDelegateImpl;
+import org.chromium.printing.PrintingController;
+import org.chromium.printing.PrintingControllerImpl;
 import org.chromium.ui.base.Clipboard;
 import org.chromium.ui.base.WindowAndroid;
 import org.chromium.ui.gfx.DeviceDisplayInfo;
 
 import java.util.concurrent.atomic.AtomicInteger;
 
 /**
  * The basic Java representation of a tab.  Contains and manages a {@link ContentView}.
  *
  * Tab provides common functionality for ChromeShell Tab as well as Chrome on Android's
@@ skipping 20 matching lines @@
  *    Some {@link Activity}s will not call this because they do not persist state, which means those
  *  ids can potentially conflict with the ones restored from persisted state depending on which
  *  {@link Activity} runs first on process start.  If {@link Tab}s are ever shared across
  *  {@link Activity}s or mixed with {@link Tab}s from other {@link Activity}s conflicts can occur
  *  unless special care is taken to make sure {@link Tab#incrementIdCounterTo(int)} is called with
  *  the correct value across all affected {@link Activity}s.
  */
 public class Tab {
     public static final int INVALID_TAB_ID = -1;
 
+    /** Tag used for logging */
+    private static final String TAG = "Tab";
+
     /** Used for automatically generating tab ids. */
     private static final AtomicInteger sIdCounter = new AtomicInteger();
 
+    private final boolean mDebug = true;
+
     private long mNativeTabAndroid;
 
     /** Unique id of this tab (within its container). */
     private final int mId;
 
     /** Whether or not this tab is an incognito tab. */
     private final boolean mIncognito;
 
     /** An Application {@link Context}.  Unlike {@link #mContext}, this is the only one that is
      * publicly exposed to help prevent leaking the {@link Activity}. */
@@ skipping 446 matching lines @@
     /**
      * Prints the current page.
      *
      * @return Whether the printing process is started successfully.
      **/
     public boolean print() {
         assert mNativeTabAndroid != 0;
         return nativePrint(mNativeTabAndroid);
     }
 
+    @CalledByNative
+    public void showPrintDialog() {
+        // TODO Is that considered private data and should not be logged?
+        if (mDebug) Log.d(TAG, "Showing print dialog for tab " + this.getTitle()
+                + " (" + this.getUrl() + ")");
+        PrintingController printingController = PrintingControllerImpl.getInstance();
+        if (printingController != null) {
+            printingController.startPrint(new TabPrinter(this),
+                    new PrintManagerDelegateImpl(mContext));
+        }
+    }
+
     /**
      * Reloads the current page content.
      */
     public void reload() {
         // TODO(dtrainor): Should we try to rebuild the ContentView if it's frozen?
         if (getWebContents() != null) getWebContents().getNavigationController().reload(true);
     }
 
     /**
      * Reloads the current page content.
@@ skipping 664 matching lines @@
     private native void nativeDestroyWebContents(long nativeTabAndroid, boolean deleteNative);
     private native Profile nativeGetProfileAndroid(long nativeTabAndroid);
     private native int nativeLoadUrl(long nativeTabAndroid, String url, String extraHeaders,
             byte[] postData, int transition, String referrerUrl, int referrerPolicy,
             boolean isRendererInitiated);
     private native void nativeSetActiveNavigationEntryTitleForUrl(long nativeTabAndroid, String url,
             String title);
     private native boolean nativePrint(long nativeTabAndroid);
     private native Bitmap nativeGetDefaultFavicon(long nativeTabAndroid);
 }