Print Preview: Hook up the print button to initiate printing without displaying a print dialog.

chrome/browser/printing/print_job_worker.cc

 // Copyright (c) 2011 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/message_loop.h"
+#include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/browser_thread.h"
 #include "chrome/browser/printing/print_job.h"
 #include "chrome/common/notification_service.h"
 #include "printing/printed_document.h"
 #include "printing/printed_page.h"
 
 namespace printing {
 
 class PrintJobWorker::NotificationTask : public Task {
@@ skipping 73 matching lines @@
         BrowserThread::UI, FROM_HERE,
         NewRunnableMethod(this, &PrintJobWorker::GetSettingsWithUI,
                           parent_view, document_page_count,
                           has_selection));
   } else {
     BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
         NewRunnableMethod(this, &PrintJobWorker::UseDefaultSettings));
   }
 }
 
+void PrintJobWorker::SetSettings(const DictionaryValue* const new_settings) {
+  DCHECK_EQ(message_loop(), MessageLoop::current());
+  DCHECK_EQ(page_number_, PageNumber::npos());

[Lei Zhang, 2011/03/02 23:28:54]

Do we need this DCHECK here?

[kmadhusu, 2011/03/04 19:39:02]

It is not required. Fixed.

+
+  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
+      NewRunnableMethod(this, &PrintJobWorker::UpdatePrintSettings,
+                        new_settings));
+}
+
+void PrintJobWorker::UpdatePrintSettings(
+    const DictionaryValue* const new_settings) {
+  // Create new PageRanges based on |new_settings|.
+  PageRanges new_ranges;
+  ListValue* pageRangeArray;

[Lei Zhang, 2011/03/02 23:28:54]

nit: pageRangeArray -> page_range_array.

[kmadhusu, 2011/03/04 19:39:02]

Done.

+  if (new_settings->GetList("pageRange", &pageRangeArray)) {
+    for (size_t index = 0; index < pageRangeArray->GetSize(); index++) {

[Lei Zhang, 2011/03/02 23:28:54]

index++ -> ++index

[kmadhusu, 2011/03/04 19:39:02]

Done.

+      DictionaryValue* dict;
+      pageRangeArray->GetDictionary(index, &dict);
+      if (dict) {

[Lei Zhang, 2011/03/02 23:28:54]

This is not the right way to check if |dict| is valid because you did not
initialize |dict| to NULL in the first place.

The better way to do this is to check to make sure GetDictionary() returned
true, just like you did with |pageRangeArray| above.

[kmadhusu, 2011/03/04 19:39:02]

Fixed.

+        PageRange range;
+        if (dict->GetInteger("from", &range.from) &&
+            dict->GetInteger("to", &range.to)) {
+          // Page numbers are 0-based.
+          range.from--;
+          range.to--;
+          new_ranges.push_back(range);
+        }
+      }
+    }
+  }
+  // We don't update any other print job settings now, so delete |new_settings|.
+  if (new_settings)

[Lei Zhang, 2011/03/02 23:28:54]

You don't need this check, you've already assumed |new_settings| is valid when
you called new_settings->GetList().

[kmadhusu, 2011/03/04 19:39:02]

Done.

+    delete new_settings;
+  PrintingContext::Result result =
+      printing_context_->UpdatePrintSettings(new_ranges);
+  GetSettingsDone(result);
+}
+
 void PrintJobWorker::GetSettingsDone(PrintingContext::Result result) {
   // Most PrintingContext functions may start a message loop and process
   // message recursively, so disable recursive task processing.
   // TODO(thestig): see above comment.  SetNestableTasksAllowed(false) needs to
   // be called on the same thread as the previous call.  See
   // http://crbug.com/73466
   // MessageLoop::current()->SetNestableTasksAllowed(false);
 
   // We can't use OnFailure() here since owner_ may not support notifications.
 
@@ skipping 205 matching lines @@
     printing::PrintJobWorker* obj) {
   DCHECK(!owner_.get());
   owner_ = obj->owner_;
 }
 
 void RunnableMethodTraits<printing::PrintJobWorker>::ReleaseCallee(
     printing::PrintJobWorker* obj) {
   DCHECK_EQ(owner_, obj->owner_);
   owner_ = NULL;
 }