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