Add printing related source codes from chrome.

chromium_src/chrome/browser/printing/printer_query.cc

@@ -0,0 +1,143 @@
+// 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/printer_query.h"
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/message_loop/message_loop.h"
+#include "base/threading/thread_restrictions.h"
+#include "base/values.h"
+#include "chrome/browser/printing/print_job_worker.h"
+#include "chrome/browser/printing/printing_ui_web_contents_observer.h"
+
+namespace printing {
+
+PrinterQuery::PrinterQuery()
+    : io_message_loop_(base::MessageLoop::current()),
+      worker_(new PrintJobWorker(this)),
+      is_print_dialog_box_shown_(false),
+      cookie_(PrintSettings::NewCookie()),
+      last_status_(PrintingContext::FAILED) {
+  DCHECK(base::MessageLoopForIO::IsCurrent());
+}
+
+PrinterQuery::~PrinterQuery() {
+  // The job should be finished (or at least canceled) when it is destroyed.
+  DCHECK(!is_print_dialog_box_shown_);
+  // If this fires, it is that this pending printer context has leaked.
+  DCHECK(!worker_.get());
+}
+
+void PrinterQuery::GetSettingsDone(const PrintSettings& new_settings,
+                                   PrintingContext::Result result) {
+  is_print_dialog_box_shown_ = false;
+  last_status_ = result;
+  if (result != PrintingContext::FAILED) {
+    settings_ = new_settings;
+    cookie_ = PrintSettings::NewCookie();
+  } else {
+    // Failure.
+    cookie_ = 0;
+  }
+
+  if (!callback_.is_null()) {
+    // This may cause reentrancy like to call StopWorker().
+    callback_.Run();
+    callback_.Reset();
+  }
+}
+
+PrintJobWorker* PrinterQuery::DetachWorker(PrintJobWorkerOwner* new_owner) {
+  DCHECK(callback_.is_null());
+  DCHECK(worker_.get());
+
+  worker_->SetNewOwner(new_owner);
+  return worker_.release();
+}
+
+base::MessageLoop* PrinterQuery::message_loop() {
+  return io_message_loop_;
+}
+
+const PrintSettings& PrinterQuery::settings() const {
+  return settings_;
+}
+
+int PrinterQuery::cookie() const {
+  return cookie_;
+}
+
+void PrinterQuery::GetSettings(
+    GetSettingsAskParam ask_user_for_settings,
+    scoped_ptr<PrintingUIWebContentsObserver> web_contents_observer,
+    int expected_page_count,
+    bool has_selection,
+    MarginType margin_type,
+    const base::Closure& callback) {
+  DCHECK_EQ(io_message_loop_, base::MessageLoop::current());
+  DCHECK(!is_print_dialog_box_shown_);
+
+  StartWorker(callback);
+
+  // Real work is done in PrintJobWorker::GetSettings().
+  is_print_dialog_box_shown_ = ask_user_for_settings == ASK_USER;
+  worker_->message_loop()->PostTask(
+      FROM_HERE,
+      base::Bind(&PrintJobWorker::GetSettings,
+                 base::Unretained(worker_.get()),
+                 is_print_dialog_box_shown_,
+                 base::Passed(&web_contents_observer),
+                 expected_page_count,
+                 has_selection,
+                 margin_type));
+}
+
+void PrinterQuery::SetSettings(const base::DictionaryValue& new_settings,
+                               const base::Closure& callback) {
+  StartWorker(callback);
+
+  worker_->message_loop()->PostTask(
+      FROM_HERE,
+      base::Bind(&PrintJobWorker::SetSettings,
+                 base::Unretained(worker_.get()),
+                 new_settings.DeepCopy()));
+}
+
+void PrinterQuery::SetWorkerDestination(
+    PrintDestinationInterface* destination) {
+  worker_->SetPrintDestination(destination);
+}
+
+void PrinterQuery::StartWorker(const base::Closure& callback) {
+  DCHECK(callback_.is_null());
+  DCHECK(worker_.get());
+
+  // Lazily create the worker thread. There is one worker thread per print job.
+  if (!worker_->message_loop())
+    worker_->Start();
+
+  callback_ = callback;
+}
+
+void PrinterQuery::StopWorker() {
+  if (worker_.get()) {
+    // http://crbug.com/66082: We're blocking on the PrinterQuery's worker
+    // thread.  It's not clear to me if this may result in blocking the current
+    // thread for an unacceptable time.  We should probably fix it.
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
+    worker_->Stop();
+    worker_.reset();
+  }
+}
+
+bool PrinterQuery::is_callback_pending() const {
+  return !callback_.is_null();
+}
+
+bool PrinterQuery::is_valid() const {
+  return worker_.get() != NULL;
+}
+
+}  // namespace printing