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
Observer(BackgroundPrintingManager * manager,WebContents * web_contents)36 BackgroundPrintingManager::Observer::Observer(
37 BackgroundPrintingManager* manager, WebContents* web_contents)
38 : content::WebContentsObserver(web_contents),
39 manager_(manager) {
40 }
41
RenderProcessGone(base::TerminationStatus status)42 void BackgroundPrintingManager::Observer::RenderProcessGone(
43 base::TerminationStatus status) {
44 manager_->DeletePreviewContents(web_contents());
45 }
WebContentsDestroyed()46 void BackgroundPrintingManager::Observer::WebContentsDestroyed() {
47 manager_->DeletePreviewContents(web_contents());
48 }
49
BackgroundPrintingManager()50 BackgroundPrintingManager::BackgroundPrintingManager() {
51 DCHECK_CURRENTLY_ON(BrowserThread::UI);
52 }
53
~BackgroundPrintingManager()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
OwnPrintPreviewDialog(WebContents * preview_dialog)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
Observe(int type,const content::NotificationSource & source,const content::NotificationDetails & details)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
DeletePreviewContents(WebContents * preview_contents)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
CurrentContentSet()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
HasPrintPreviewDialog(WebContents * preview_dialog)129 bool BackgroundPrintingManager::HasPrintPreviewDialog(
130 WebContents* preview_dialog) {
131 return ContainsKey(printing_contents_map_, preview_dialog);
132 }
133
134 } // namespace printing
135