chrome/browser/printing/background_printing_manager.cc

   1 // Copyright (c) 2012 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 "chrome/browser/printing/background_printing_manager.h"
   6
   7 #include "base/stl_util.h"
   8 #include "chrome/browser/chrome_notification_types.h"
   9 #include "chrome/browser/printing/print_job.h"
  10 #include "chrome/browser/printing/print_preview_dialog_controller.h"
  11 #include "content/public/browser/browser_thread.h"
  12 #include "content/public/browser/notification_details.h"
  13 #include "content/public/browser/notification_source.h"
  14 #include "content/public/browser/render_view_host.h"
  15 #include "content/public/browser/web_contents.h"
  16 #include "content/public/browser/web_contents_delegate.h"
  17 #include "content/public/browser/web_contents_observer.h"
  18
  19 using content::BrowserThread;
  20 using content::WebContents;
  21
  22 namespace printing {
  23
  24 class BackgroundPrintingManager::Observer
  25     : public content::WebContentsObserver {
  26  public:
  27   Observer(BackgroundPrintingManager* manager, WebContents* web_contents);
  28
  29  private:
  30   virtual void RenderProcessGone(base::TerminationStatus status) OVERRIDE;
  31   virtual void WebContentsDestroyed() OVERRIDE;
  32
  33   BackgroundPrintingManager* manager_;
  34 };
  35
  36 BackgroundPrintingManager::Observer::Observer(
  37     BackgroundPrintingManager* manager, WebContents* web_contents)
  38     : content::WebContentsObserver(web_contents),
  39       manager_(manager) {
  40 }
  41
  42 void BackgroundPrintingManager::Observer::RenderProcessGone(
  43     base::TerminationStatus status) {
  44   manager_->DeletePreviewContents(web_contents());
  45 }
  46 void BackgroundPrintingManager::Observer::WebContentsDestroyed() {
  47   manager_->DeletePreviewContents(web_contents());
  48 }
  49
  50 BackgroundPrintingManager::BackgroundPrintingManager() {
  51   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  52 }
  53
  54 BackgroundPrintingManager::~BackgroundPrintingManager() {
  55   DCHECK(CalledOnValidThread());
  56   // The might be some WebContentses still in |printing_contents_map_| at this
  57   // point (e.g. when the last remaining tab closes and there is still a print
  58   // preview WebContents trying to print). In such a case it will fail to print,
  59   // but we should at least clean up the observers.
  60   // TODO(thestig): Handle this case better.
  61   STLDeleteValues(&printing_contents_map_);
  62 }
  63
  64 void BackgroundPrintingManager::OwnPrintPreviewDialog(
  65     WebContents* preview_dialog) {
  66   DCHECK(CalledOnValidThread());
  67   DCHECK(PrintPreviewDialogController::IsPrintPreviewDialog(preview_dialog));
  68   CHECK(!HasPrintPreviewDialog(preview_dialog));
  69
  70   printing_contents_map_[preview_dialog] = new Observer(this, preview_dialog);
  71
  72   // Watch for print jobs finishing. Everything else is watched for by the
  73   // Observer. TODO(avi, cait): finish the job of removing this last
  74   // notification.
  75   registrar_.Add(this, chrome::NOTIFICATION_PRINT_JOB_RELEASED,
  76                  content::Source<WebContents>(preview_dialog));
  77
  78   // Activate the initiator.
  79   PrintPreviewDialogController* dialog_controller =
  80       PrintPreviewDialogController::GetInstance();
  81   if (!dialog_controller)
  82     return;
  83   WebContents* initiator = dialog_controller->GetInitiator(preview_dialog);
  84   if (!initiator)
  85     return;
  86   initiator->GetDelegate()->ActivateContents(initiator);
  87 }
  88
  89 void BackgroundPrintingManager::Observe(
  90     int type,
  91     const content::NotificationSource& source,
  92     const content::NotificationDetails& details) {
  93   DCHECK_EQ(chrome::NOTIFICATION_PRINT_JOB_RELEASED, type);
  94   DeletePreviewContents(content::Source<WebContents>(source).ptr());
  95 }
  96
  97 void BackgroundPrintingManager::DeletePreviewContents(
  98     WebContents* preview_contents) {
  99   WebContentsObserverMap::iterator i =
 100       printing_contents_map_.find(preview_contents);
 101   if (i == printing_contents_map_.end()) {
 102     // Everyone is racing to be the first to delete the |preview_contents|. If
 103     // this case is hit, someone else won the race, so there is no need to
 104     // continue. <http://crbug.com/100806>
 105     return;
 106   }
 107
 108   // Stop all observation ...
 109   registrar_.Remove(this, chrome::NOTIFICATION_PRINT_JOB_RELEASED,
 110                     content::Source<WebContents>(preview_contents));
 111   Observer* observer = i->second;
 112   printing_contents_map_.erase(i);
 113   delete observer;
 114
 115   // ... and mortally wound the contents. (Deletion immediately is not a good
 116   // idea in case this was called from RenderViewGone.)
 117   base::MessageLoop::current()->DeleteSoon(FROM_HERE, preview_contents);
 118 }
 119
 120 std::set<content::WebContents*> BackgroundPrintingManager::CurrentContentSet() {
 121   std::set<content::WebContents*> result;
 122   for (WebContentsObserverMap::iterator i = printing_contents_map_.begin();
 123        i != printing_contents_map_.end(); ++i) {
 124     result.insert(i->first);
 125   }
 126   return result;
 127 }
 128
 129 bool BackgroundPrintingManager::HasPrintPreviewDialog(
 130     WebContents* preview_dialog) {
 131   return ContainsKey(printing_contents_map_, preview_dialog);
 132 }
 133
 134 }  // namespace printing