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   CreatePdfSettings(env, obj);
  41   AwPrintManager* print_manager =
  42       AwPrintManager::CreateForWebContents(
  43           web_contents_, *print_settings_, base::FileDescriptor(fd, false),
  44           base::Bind(&AwPdfExporter::DidExportPdf, base::Unretained(this)));
  45
  46   if (!print_manager->PrintNow())
  47     DidExportPdf(fd, false);
  48 }
  49
  50 namespace {
  51 // Converts from 1/1000 of inches to device units using DPI.
  52 int MilsToDots(int val, int dpi) {
  53   return static_cast<int>(printing::ConvertUnitDouble(val, 1000.0, dpi));
  54 }
  55 }  // anonymous namespace
  56
  57 void AwPdfExporter::CreatePdfSettings(JNIEnv* env, jobject obj) {
  58   print_settings_.reset(new printing::PrintSettings);
  59   int dpi = Java_AwPdfExporter_getDpi(env, obj);
  60   int width = Java_AwPdfExporter_getPageWidth(env, obj);
  61   int height = Java_AwPdfExporter_getPageHeight(env, obj);
  62   gfx::Size physical_size_device_units;
  63   int width_in_dots = MilsToDots(width, dpi);
  64   int height_in_dots = MilsToDots(height, dpi);
  65   physical_size_device_units.SetSize(width_in_dots, height_in_dots);
  66
  67   gfx::Rect printable_area_device_units;
  68   // Assume full page is printable for now.
  69   printable_area_device_units.SetRect(0, 0, width_in_dots, height_in_dots);
  70
  71   print_settings_->set_dpi(dpi);
  72   // TODO(sgurun) verify that the value for newly added parameter for
  73   // (i.e. landscape_needs_flip) is correct.
  74   print_settings_->SetPrinterPrintableArea(physical_size_device_units,
  75                                            printable_area_device_units,
  76                                            true);
  77
  78   printing::PageMargins margins;
  79   margins.left =
  80       MilsToDots(Java_AwPdfExporter_getLeftMargin(env, obj), dpi);
  81   margins.right =
  82       MilsToDots(Java_AwPdfExporter_getRightMargin(env, obj), dpi);
  83   margins.top =
  84       MilsToDots(Java_AwPdfExporter_getTopMargin(env, obj), dpi);
  85   margins.bottom =
  86       MilsToDots(Java_AwPdfExporter_getBottomMargin(env, obj), dpi);
  87   print_settings_->SetCustomMargins(margins);
  88   print_settings_->set_should_print_backgrounds(true);
  89 }
  90
  91 void AwPdfExporter::DidExportPdf(int fd, bool success) {
  92   JNIEnv* env = base::android::AttachCurrentThread();
  93   ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
  94   if (obj.is_null())
  95     return;
  96   Java_AwPdfExporter_didExportPdf(env, obj.obj(), success);
  97 }
  98
  99 bool RegisterAwPdfExporter(JNIEnv* env) {
 100   return RegisterNativesImpl(env);
 101 }
 102
 103 }  // namespace android_webview