android_webview/native/aw_pdf_exporter.cc

   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 #include "android_webview/native/aw_pdf_exporter.h"
   6
   7 #include "base/android/jni_android.h"
   8 #include "base/logging.h"
   9 #include "content/public/browser/browser_thread.h"
  10 #include "content/public/browser/web_contents.h"
  11 #include "jni/AwPdfExporter_jni.h"
  12 #include "printing/print_settings.h"
  13 #include "printing/units.h"
  14
  15 using base::android::AttachCurrentThread;
  16 using base::android::ScopedJavaGlobalRef;
  17 using content::BrowserThread;
  18 using content::WebContents;
  19 using printing::ConvertUnitDouble;
  20 using printing::PageMargins;
  21 using printing::PrintSettings;
  22
  23 namespace android_webview {
  24
  25 AwPdfExporter::AwPdfExporter(JNIEnv* env,
  26                              jobject obj,
  27                              WebContents* web_contents)
  28     : java_ref_(env, obj),
  29       web_contents_(web_contents) {
  30   DCHECK(obj);
  31   Java_AwPdfExporter_setNativeAwPdfExporter(
  32       env, obj, reinterpret_cast<intptr_t>(this));
  33 }
  34
  35 AwPdfExporter::~AwPdfExporter() {
  36   JNIEnv* env = AttachCurrentThread();
  37   ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
  38   if (obj.is_null())
  39     return;
  40   // Clear the Java peer's weak pointer to |this| object.
  41   Java_AwPdfExporter_setNativeAwPdfExporter(env, obj.obj(), 0);
  42 }
  43
  44 void AwPdfExporter::ExportToPdf(JNIEnv* env,
  45                                 jobject obj,
  46                                 int fd,
  47                                 jobject cancel_signal) {
  48   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  49   CreatePdfSettings(env, obj);
  50   PrintManager* print_manager =
  51       PrintManager::CreateForWebContents(
  52           web_contents_, print_settings_.get(), fd, this);
  53   if (!print_manager->PrintNow())
  54     DidExportPdf(false);
  55 }
  56
  57 namespace {
  58 // Converts from 1/1000 of inches to device units using DPI.
  59 int MilsToDots(int val, int dpi) {
  60   return static_cast<int>(ConvertUnitDouble(val, 1000.0, dpi));
  61 }
  62
  63 }  // anonymous namespace
  64
  65 void AwPdfExporter::CreatePdfSettings(JNIEnv* env, jobject obj) {
  66   print_settings_.reset(new PrintSettings);
  67   int dpi = Java_AwPdfExporter_getDpi(env, obj);
  68   int width = Java_AwPdfExporter_getPageWidth(env, obj);
  69   int height = Java_AwPdfExporter_getPageHeight(env, obj);
  70   gfx::Size physical_size_device_units;
  71   int width_in_dots = MilsToDots(width, dpi);
  72   int height_in_dots = MilsToDots(height, dpi);
  73   physical_size_device_units.SetSize(width_in_dots, height_in_dots);
  74
  75   gfx::Rect printable_area_device_units;
  76   // Assume full page is printable for now.
  77   printable_area_device_units.SetRect(0, 0, width_in_dots, height_in_dots);
  78
  79   print_settings_->set_dpi(dpi);
  80   // TODO(sgurun) verify that the value for newly added parameter for
  81   // (i.e. landscape_needs_flip) is correct.
  82   print_settings_->SetPrinterPrintableArea(physical_size_device_units,
  83                                            printable_area_device_units,
  84                                            true);
  85
  86   PageMargins margins;
  87   margins.left =
  88       MilsToDots(Java_AwPdfExporter_getLeftMargin(env, obj), dpi);
  89   margins.right =
  90       MilsToDots(Java_AwPdfExporter_getRightMargin(env, obj), dpi);
  91   margins.top =
  92       MilsToDots(Java_AwPdfExporter_getTopMargin(env, obj), dpi);
  93   margins.bottom =
  94       MilsToDots(Java_AwPdfExporter_getBottomMargin(env, obj), dpi);
  95   print_settings_->SetCustomMargins(margins);
  96   print_settings_->set_should_print_backgrounds(true);
  97 }
  98
  99 void AwPdfExporter::DidExportPdf(bool success) {
 100   JNIEnv* env = AttachCurrentThread();
 101   ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
 102   if (obj.is_null())
 103     return;
 104   Java_AwPdfExporter_didExportPdf(env, obj.obj(), success);
 105 }
 106
 107 bool AwPdfExporter::IsCancelled() {
 108   // TODO(sgurun) implement. Needs connecting with the |cancel_signal| passed
 109   // in the constructor.
 110   return false;
 111 }
 112
 113 bool RegisterAwPdfExporter(JNIEnv* env) {
 114   return RegisterNativesImpl(env);
 115 }
 116
 117 }  // namespace android_webview