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      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/renderer_host/print_manager.h"
      8 #include "base/android/jni_android.h"
      9 #include "base/logging.h"
     10 #include "content/public/browser/browser_thread.h"
     11 #include "content/public/browser/web_contents.h"
     12 #include "jni/AwPdfExporter_jni.h"
     13 #include "printing/print_settings.h"
     14 #include "printing/units.h"
     15 
     16 using base::android::AttachCurrentThread;
     17 using base::android::ScopedJavaGlobalRef;
     18 using content::BrowserThread;
     19 using content::WebContents;
     20 using printing::ConvertUnitDouble;
     21 using printing::PageMargins;
     22 using printing::PrintSettings;
     23 
     24 namespace android_webview {
     25 
     26 AwPdfExporter::AwPdfExporter(JNIEnv* env,
     27                              jobject obj,
     28                              WebContents* web_contents)
     29     : java_ref_(env, obj),
     30       web_contents_(web_contents) {
     31   DCHECK(obj);
     32   Java_AwPdfExporter_setNativeAwPdfExporter(
     33       env, obj, reinterpret_cast<intptr_t>(this));
     34 }
     35 
     36 AwPdfExporter::~AwPdfExporter() {
     37   JNIEnv* env = AttachCurrentThread();
     38   ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
     39   if (obj.is_null())
     40     return;
     41   // Clear the Java peer's weak pointer to |this| object.
     42   Java_AwPdfExporter_setNativeAwPdfExporter(env, obj.obj(), 0);
     43 }
     44 
     45 void AwPdfExporter::ExportToPdf(JNIEnv* env,
     46                                 jobject obj,
     47                                 int fd,
     48                                 jobject cancel_signal) {
     49   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
     50   CreatePdfSettings(env, obj);
     51   print_manager_.reset(
     52       new PrintManager(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
    118