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// Copyright 2012 The Chromium Authors
// 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/containers/contains.h"
#include "base/location.h"
#include "base/memory/raw_ptr.h"
#include "base/task/single_thread_task_runner.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/web_contents.h"
#include "content/public/browser/web_contents_observer.h"
using content::BrowserContext;
using content::BrowserThread;
using content::WebContents;
namespace printing {
class BackgroundPrintingManager::Observer
: public content::WebContentsObserver {
public:
Observer(BackgroundPrintingManager* manager, WebContents* web_contents);
private:
void PrimaryMainFrameRenderProcessGone(
base::TerminationStatus status) override;
raw_ptr<BackgroundPrintingManager> manager_;
};
BackgroundPrintingManager::Observer::Observer(
BackgroundPrintingManager* manager, WebContents* web_contents)
: content::WebContentsObserver(web_contents),
manager_(manager) {
}
void BackgroundPrintingManager::Observer::PrimaryMainFrameRenderProcessGone(
base::TerminationStatus status) {
manager_->DeletePreviewContents(web_contents());
}
BackgroundPrintingManager::BackgroundPrintingManager() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
}
BackgroundPrintingManager::~BackgroundPrintingManager() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// 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.
}
void BackgroundPrintingManager::OwnPrintPreviewDialog(
std::unique_ptr<WebContents> preview_dialog) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(PrintPreviewDialogController::IsPrintPreviewURL(
preview_dialog->GetVisibleURL()));
CHECK(!HasPrintPreviewDialog(preview_dialog.get()));
WebContents* raw_preview_dialog = preview_dialog.get();
PrintingContents printing_contents;
printing_contents.observer =
std::make_unique<Observer>(this, raw_preview_dialog);
printing_contents.contents = std::move(preview_dialog);
printing_contents_map_[raw_preview_dialog] = std::move(printing_contents);
}
void BackgroundPrintingManager::DeletePreviewContentsForBrowserContext(
BrowserContext* browser_context) {
std::vector<WebContents*> preview_contents_to_delete;
for (const auto& iter : printing_contents_map_) {
WebContents* preview_contents = iter.first;
if (preview_contents->GetBrowserContext() == browser_context) {
preview_contents_to_delete.push_back(preview_contents);
}
}
for (size_t i = 0; i < preview_contents_to_delete.size(); i++) {
DeletePreviewContents(preview_contents_to_delete[i]);
}
}
void BackgroundPrintingManager::OnPrintRequestCancelled(
WebContents* preview_contents) {
DeletePreviewContents(preview_contents);
}
void BackgroundPrintingManager::DeletePreviewContents(
WebContents* preview_contents) {
auto 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;
}
std::unique_ptr<WebContents> contents_to_delete =
std::move(i->second.contents);
printing_contents_map_.erase(i);
// ... and mortally wound the contents. Deletion immediately is not a good
// idea in case this was triggered by `preview_contents` far up the
// callstack. (Trace where the NOTIFICATION_PRINT_JOB_RELEASED comes from.)
base::SingleThreadTaskRunner::GetCurrentDefault()->DeleteSoon(
FROM_HERE, std::move(contents_to_delete));
}
std::set<content::WebContents*> BackgroundPrintingManager::CurrentContentSet() {
std::set<content::WebContents*> result;
for (const auto& entry : printing_contents_map_)
result.insert(entry.first);
return result;
}
bool BackgroundPrintingManager::HasPrintPreviewDialog(
WebContents* preview_dialog) {
return base::Contains(printing_contents_map_, preview_dialog);
}
BackgroundPrintingManager::PrintingContents::PrintingContents() = default;
BackgroundPrintingManager::PrintingContents::~PrintingContents() = default;
BackgroundPrintingManager::PrintingContents::PrintingContents(
PrintingContents&&) = default;
BackgroundPrintingManager::PrintingContents&
BackgroundPrintingManager::PrintingContents::operator=(PrintingContents&&) =
default;
} // namespace printing
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