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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/browser_view_renderer.h"
      8 #include "android_webview/browser/renderer_host/print_manager.h"
      9 #include "base/android/jni_android.h"
     10 #include "base/logging.h"
     11 #include "content/public/browser/browser_thread.h"
     12 #include "content/public/browser/web_contents.h"
     13 #include "jni/AwPdfExporter_jni.h"
     14 #include "printing/units.h"
     15 #include "printing/print_settings.h"
     16 
     17 using base::android::AttachCurrentThread;
     18 using base::android::ScopedJavaGlobalRef;
     19 using content::BrowserThread;
     20 using content::WebContents;
     21 using printing::ConvertUnitDouble;
     22 using printing::PageMargins;
     23 using printing::PrintSettings;
     24 
     25 namespace android_webview {
     26 
     27 AwPdfExporter::AwPdfExporter(JNIEnv* env,
     28                              jobject obj,
     29                              BrowserViewRenderer* view_renderer,
     30                              WebContents* web_contents)
     31     : java_ref_(env, obj),
     32       view_renderer_(view_renderer),
     33       web_contents_(web_contents) {
     34 
     35   DCHECK(obj);
     36   Java_AwPdfExporter_setNativeAwPdfExporter(
     37       env, obj, reinterpret_cast<jint>(this));
     38 }
     39 
     40 AwPdfExporter::~AwPdfExporter() {
     41   JNIEnv* env = AttachCurrentThread();
     42   ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
     43   if (obj.is_null())
     44     return;
     45   // Clear the Java peer's weak pointer to |this| object.
     46   Java_AwPdfExporter_setNativeAwPdfExporter(env, obj.obj(), 0);
     47 }
     48 
     49 void AwPdfExporter::ExportToPdf(JNIEnv* env,
     50                                 jobject obj,
     51                                 int fd,
     52                                 jobject cancel_signal) {
     53   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
     54   CreatePdfSettings(env, obj);
     55   print_manager_.reset(
     56       new PrintManager(web_contents_, print_settings_.get(), fd, this));
     57   if (!print_manager_->PrintNow())
     58     DidExportPdf(false);
     59 }
     60 
     61 namespace {
     62 // Converts from 1/1000 of inches to device units using DPI.
     63 int MilsToDots(int val, int dpi) {
     64   return static_cast<int>(ConvertUnitDouble(val, 1000.0, dpi));
     65 }
     66 
     67 }  // anonymous namespace
     68 
     69 void AwPdfExporter::CreatePdfSettings(JNIEnv* env, jobject obj) {
     70   print_settings_.reset(new PrintSettings);
     71   int dpi = Java_AwPdfExporter_getDpi(env, obj);
     72   int width = Java_AwPdfExporter_getPageWidth(env, obj);
     73   int height = Java_AwPdfExporter_getPageHeight(env, obj);
     74   gfx::Size physical_size_device_units;
     75   int width_in_dots = MilsToDots(width, dpi);
     76   int height_in_dots = MilsToDots(height, dpi);
     77   physical_size_device_units.SetSize(width_in_dots, height_in_dots);
     78 
     79   gfx::Rect printable_area_device_units;
     80   // Assume full page is printable for now.
     81   printable_area_device_units.SetRect(0, 0, width_in_dots, height_in_dots);
     82 
     83   print_settings_->set_dpi(dpi);
     84   print_settings_->SetPrinterPrintableArea(physical_size_device_units,
     85                                            printable_area_device_units,
     86                                            dpi);
     87 
     88   PageMargins margins;
     89   margins.left =
     90       MilsToDots(Java_AwPdfExporter_getLeftMargin(env, obj), dpi);
     91   margins.right =
     92       MilsToDots(Java_AwPdfExporter_getRightMargin(env, obj), dpi);
     93   margins.top =
     94       MilsToDots(Java_AwPdfExporter_getTopMargin(env, obj), dpi);
     95   margins.bottom =
     96       MilsToDots(Java_AwPdfExporter_getBottomMargin(env, obj), dpi);
     97   print_settings_->SetCustomMargins(margins);
     98   print_settings_->should_print_backgrounds = true;
     99 }
    100 
    101 void AwPdfExporter::DidExportPdf(bool success) {
    102   JNIEnv* env = AttachCurrentThread();
    103   ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
    104   if (obj.is_null())
    105     return;
    106   Java_AwPdfExporter_didExportPdf(env, obj.obj(), success);
    107 }
    108 
    109 bool AwPdfExporter::IsCancelled() {
    110   // TODO(sgurun) implement
    111   return false;
    112 }
    113 
    114 bool RegisterAwPdfExporter(JNIEnv* env) {
    115   return RegisterNativesImpl(env) >= 0;
    116 }
    117 
    118 }  // namespace android_webview
    119