Implement window.print() on Android

chrome/browser/printing/print_job_worker.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/printing/print_job_worker.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/message_loop/message_loop.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/printing/print_job.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 #include "printing/print_job_constants.h"
 #include "printing/printed_document.h"
 #include "printing/printed_page.h"
 #include "printing/printing_utils.h"
 #include "ui/base/l10n/l10n_util.h"
 
+#if defined(OS_ANDROID)
+#include "chrome/browser/android/tab_android.h"
+#endif
+
 using content::BrowserThread;
 
 namespace printing {
 
 namespace {
 
 // Helper function to ensure |owner| is valid until at least |callback| returns.
 void HoldRefCallback(const scoped_refptr<printing::PrintJobWorkerOwner>& owner,
                      const base::Closure& callback) {
   callback.Run();
@@ skipping 73 matching lines @@
   DCHECK(owner_->RunsTasksOnCurrentThread());
   Stop();
 }
 
 void PrintJobWorker::SetNewOwner(PrintJobWorkerOwner* new_owner) {
   DCHECK(page_number_ == PageNumber::npos());
   owner_ = new_owner;
 }
 
 void PrintJobWorker::GetSettings(
-    bool ask_user_for_settings,
+    PrinterQuery::GetSettingsAskParam ask_settings_type,
     int document_page_count,
     bool has_selection,
     MarginType margin_type) {
   DCHECK(task_runner_->RunsTasksOnCurrentThread());
   DCHECK_EQ(page_number_, PageNumber::npos());
 
   // Recursive task processing is needed for the dialog in case it needs to be
   // destroyed by a task.
   // TODO(thestig): This code is wrong. SetNestableTasksAllowed(true) is needed
   // on the thread where the PrintDlgEx is called, and definitely both calls
   // should happen on the same thread. See http://crbug.com/73466
   // MessageLoop::current()->SetNestableTasksAllowed(true);
   printing_context_->set_margin_type(margin_type);
 
   // When we delegate to a destination, we don't ask the user for settings.
   // TODO(mad): Ask the destination for settings.
-  if (ask_user_for_settings) {
+  if (ask_settings_type == PrinterQuery::GetSettingsAskParam::ASK_USER) {
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(&HoldRefCallback, make_scoped_refptr(owner_),
                    base::Bind(&PrintJobWorker::GetSettingsWithUI,

[Vitaly Buka (NO REVIEWS), 2014/12/12 08:37:16]

ASK_USER vs SYSTEM_SPECIFIC is meaningless for other platforms
let just pass this information as aditional boolean value. maybe is_scripted

                               base::Unretained(this),
                               document_page_count,
                               has_selection)));
+  } else if (ask_settings_type ==
+      PrinterQuery::GetSettingsAskParam::SYSTEM_SPECIFIC) {
+    BrowserThread::PostTask(
+        BrowserThread::UI, FROM_HERE,
+        base::Bind(&HoldRefCallback, make_scoped_refptr(owner_),
+                   base::Bind(&PrintJobWorker::ShowSystemDialog,
+                              base::Unretained(this))));
   } else {
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(&HoldRefCallback, make_scoped_refptr(owner_),
                    base::Bind(&PrintJobWorker::UseDefaultSettings,
                               base::Unretained(this))));
   }
 }
 
+void PrintJobWorker::ShowSystemDialog() {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+#if defined(OS_ANDROID)
+  PrintingContextDelegate* pcd =
+      static_cast<PrintingContextDelegate*>(printing_context_delegate_.get());
+  content::WebContents* wc = pcd->GetWebContents();

[Vitaly Buka (NO REVIEWS), 2014/12/12 08:37:16]

please merge ShowSystemDialog and GetSettingsWithUI and branch as low as
possible
ideally in context

I see that you need TabAndroid for that, we will refactor delegate in future CL
for that.

+  TabAndroid* tab = TabAndroid::FromWebContents(wc);
+  if (tab) {
+    // If fails or is not called, attempting to start a pending print does
+    // nothing and will notify that printing is finished.
+    tab->SetPendingPrint();
+  }
+#endif
+
+  printing_context_->RequestSystemDialog(
+        base::Bind(&PrintJobWorker::GetSettingsDone,
+                   base::Unretained(this)));
+}
+
 void PrintJobWorker::SetSettings(
     scoped_ptr<base::DictionaryValue> new_settings) {
   DCHECK(task_runner_->RunsTasksOnCurrentThread());
 
   BrowserThread::PostTask(
       BrowserThread::UI,
       FROM_HERE,
       base::Bind(&HoldRefCallback,
                  make_scoped_refptr(owner_),
                  base::Bind(&PrintJobWorker::UpdatePrintSettings,
@@ skipping 244 matching lines @@
                               document_,
                               scoped_refptr<PrintedPage>()));
   Cancel();
 
   // Makes sure the variables are reinitialized.
   document_ = NULL;
   page_number_ = PageNumber::npos();
 }
 
 }  // namespace printing