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// 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/background_printing_manager.h"
#include "base/stl_util.h"
#include "chrome/browser/chrome_notification_types.h"
#include "chrome/browser/printing/print_job.h"
#include "chrome/browser/printing/print_preview_dialog_controller.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/notification_details.h"
#include "content/public/browser/notification_source.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_contents_delegate.h"
#include "content/public/browser/web_contents_observer.h"
using content::BrowserThread;
using content::WebContents;
namespace printing {
class BackgroundPrintingManager::Observer
: public content::WebContentsObserver {
public:
Observer(BackgroundPrintingManager* manager, WebContents* web_contents);
private:
void RenderProcessGone(base::TerminationStatus status) override;
void WebContentsDestroyed() override;
BackgroundPrintingManager* manager_;
};
BackgroundPrintingManager::Observer::Observer(
BackgroundPrintingManager* manager, WebContents* web_contents)
: content::WebContentsObserver(web_contents),
manager_(manager) {
}
void BackgroundPrintingManager::Observer::RenderProcessGone(
base::TerminationStatus status) {
manager_->DeletePreviewContents(web_contents());
}
void BackgroundPrintingManager::Observer::WebContentsDestroyed() {
manager_->DeletePreviewContents(web_contents());
}
BackgroundPrintingManager::BackgroundPrintingManager() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
}
BackgroundPrintingManager::~BackgroundPrintingManager() {
DCHECK(CalledOnValidThread());
// The might be some WebContentses still in |printing_contents_map_| at this
// point (e.g. when the last remaining tab closes and there is still a print
// preview WebContents trying to print). In such a case it will fail to print,
// but we should at least clean up the observers.
// TODO(thestig): Handle this case better.
STLDeleteValues(&printing_contents_map_);
}
void BackgroundPrintingManager::OwnPrintPreviewDialog(
WebContents* preview_dialog) {
DCHECK(CalledOnValidThread());
DCHECK(PrintPreviewDialogController::IsPrintPreviewDialog(preview_dialog));
CHECK(!HasPrintPreviewDialog(preview_dialog));
printing_contents_map_[preview_dialog] = new Observer(this, preview_dialog);
// Watch for print jobs finishing. Everything else is watched for by the
// Observer. TODO(avi, cait): finish the job of removing this last
// notification.
registrar_.Add(this, chrome::NOTIFICATION_PRINT_JOB_RELEASED,
content::Source<WebContents>(preview_dialog));
// Activate the initiator.
PrintPreviewDialogController* dialog_controller =
PrintPreviewDialogController::GetInstance();
if (!dialog_controller)
return;
WebContents* initiator = dialog_controller->GetInitiator(preview_dialog);
if (!initiator)
return;
initiator->GetDelegate()->ActivateContents(initiator);
}
void BackgroundPrintingManager::Observe(
int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) {
DCHECK_EQ(chrome::NOTIFICATION_PRINT_JOB_RELEASED, type);
DeletePreviewContents(content::Source<WebContents>(source).ptr());
}
void BackgroundPrintingManager::DeletePreviewContents(
WebContents* preview_contents) {
WebContentsObserverMap::iterator i =
printing_contents_map_.find(preview_contents);
if (i == printing_contents_map_.end()) {
// Everyone is racing to be the first to delete the |preview_contents|. If
// this case is hit, someone else won the race, so there is no need to
// continue. <http://crbug.com/100806>
return;
}
// Stop all observation ...
registrar_.Remove(this, chrome::NOTIFICATION_PRINT_JOB_RELEASED,
content::Source<WebContents>(preview_contents));
Observer* observer = i->second;
printing_contents_map_.erase(i);
delete observer;
// ... and mortally wound the contents. (Deletion immediately is not a good
// idea in case this was called from RenderViewGone.)
base::MessageLoop::current()->DeleteSoon(FROM_HERE, preview_contents);
}
std::set<content::WebContents*> BackgroundPrintingManager::CurrentContentSet() {
std::set<content::WebContents*> result;
for (WebContentsObserverMap::iterator i = printing_contents_map_.begin();
i != printing_contents_map_.end(); ++i) {
result.insert(i->first);
}
return result;
}
bool BackgroundPrintingManager::HasPrintPreviewDialog(
WebContents* preview_dialog) {
return ContainsKey(printing_contents_map_, preview_dialog);
}
} // namespace printing
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