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// Copyright 2014 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/dom_distiller/tab_utils.h"
#include "base/message_loop/message_loop.h"
#include "chrome/browser/dom_distiller/dom_distiller_service_factory.h"
#include "chrome/browser/ui/tab_contents/core_tab_helper.h"
#include "chrome/browser/ui/tab_contents/core_tab_helper_delegate.h"
#include "components/dom_distiller/content/distiller_page_web_contents.h"
#include "components/dom_distiller/core/distiller_page.h"
#include "components/dom_distiller/core/dom_distiller_service.h"
#include "components/dom_distiller/core/task_tracker.h"
#include "components/dom_distiller/core/url_constants.h"
#include "components/dom_distiller/core/url_utils.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/navigation_controller.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_contents_observer.h"
namespace {
using dom_distiller::ViewRequestDelegate;
using dom_distiller::DistilledArticleProto;
using dom_distiller::ArticleDistillationUpdate;
using dom_distiller::ViewerHandle;
using dom_distiller::SourcePageHandleWebContents;
using dom_distiller::DomDistillerService;
using dom_distiller::DomDistillerServiceFactory;
using dom_distiller::DistillerPage;
using dom_distiller::SourcePageHandle;
// An no-op ViewRequestDelegate which holds a ViewerHandle and deletes itself
// after the WebContents navigates or goes away. This class is a band-aid to
// keep a TaskTracker around until the distillation starts from the viewer.
class SelfDeletingRequestDelegate : public ViewRequestDelegate,
public content::WebContentsObserver {
public:
explicit SelfDeletingRequestDelegate(content::WebContents* web_contents);
~SelfDeletingRequestDelegate() override;
// ViewRequestDelegate implementation.
void OnArticleReady(const DistilledArticleProto* article_proto) override;
void OnArticleUpdated(ArticleDistillationUpdate article_update) override;
// content::WebContentsObserver implementation.
void DidNavigateMainFrame(
const content::LoadCommittedDetails& details,
const content::FrameNavigateParams& params) override;
void RenderProcessGone(base::TerminationStatus status) override;
void WebContentsDestroyed() override;
// Takes ownership of the ViewerHandle to keep distillation alive until |this|
// is deleted.
void TakeViewerHandle(scoped_ptr<ViewerHandle> viewer_handle);
private:
// The handle to the view request towards the DomDistillerService. It
// needs to be kept around to ensure the distillation request finishes.
scoped_ptr<ViewerHandle> viewer_handle_;
};
void SelfDeletingRequestDelegate::DidNavigateMainFrame(
const content::LoadCommittedDetails& details,
const content::FrameNavigateParams& params) {
Observe(NULL);
base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
}
void SelfDeletingRequestDelegate::RenderProcessGone(
base::TerminationStatus status) {
Observe(NULL);
base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
}
void SelfDeletingRequestDelegate::WebContentsDestroyed() {
Observe(NULL);
base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
}
SelfDeletingRequestDelegate::SelfDeletingRequestDelegate(
content::WebContents* web_contents)
: WebContentsObserver(web_contents) {
}
SelfDeletingRequestDelegate::~SelfDeletingRequestDelegate() {
}
void SelfDeletingRequestDelegate::OnArticleReady(
const DistilledArticleProto* article_proto) {
}
void SelfDeletingRequestDelegate::OnArticleUpdated(
ArticleDistillationUpdate article_update) {
}
void SelfDeletingRequestDelegate::TakeViewerHandle(
scoped_ptr<ViewerHandle> viewer_handle) {
viewer_handle_ = viewer_handle.Pass();
}
// Start loading the viewer URL of the current page in |web_contents|.
void StartNavigationToDistillerViewer(content::WebContents* web_contents,
const GURL& url) {
GURL viewer_url = dom_distiller::url_utils::GetDistillerViewUrlFromUrl(
dom_distiller::kDomDistillerScheme, url);
content::NavigationController::LoadURLParams params(viewer_url);
params.transition_type = ui::PAGE_TRANSITION_AUTO_BOOKMARK;
web_contents->GetController().LoadURLWithParams(params);
}
void StartDistillation(content::WebContents* web_contents) {
// Start distillation using |web_contents|, and ensure ViewerHandle stays
// around until the viewer requests distillation.
SelfDeletingRequestDelegate* view_request_delegate =
new SelfDeletingRequestDelegate(web_contents);
scoped_ptr<content::WebContents> old_web_contents_sptr(web_contents);
scoped_ptr<SourcePageHandleWebContents> source_page_handle(
new SourcePageHandleWebContents(old_web_contents_sptr.Pass()));
DomDistillerService* dom_distiller_service =
DomDistillerServiceFactory::GetForBrowserContext(
web_contents->GetBrowserContext());
scoped_ptr<DistillerPage> distiller_page =
dom_distiller_service->CreateDefaultDistillerPageWithHandle(
source_page_handle.Pass()).Pass();
const GURL& last_committed_url = web_contents->GetLastCommittedURL();
scoped_ptr<ViewerHandle> viewer_handle = dom_distiller_service->ViewUrl(
view_request_delegate, distiller_page.Pass(), last_committed_url);
view_request_delegate->TakeViewerHandle(viewer_handle.Pass());
}
} // namespace
void DistillCurrentPageAndView(content::WebContents* old_web_contents) {
DCHECK(old_web_contents);
// Create new WebContents.
content::WebContents::CreateParams create_params(
old_web_contents->GetBrowserContext());
content::WebContents* new_web_contents =
content::WebContents::Create(create_params);
DCHECK(new_web_contents);
// Copy all navigation state from the old WebContents to the new one.
new_web_contents->GetController().CopyStateFrom(
old_web_contents->GetController());
// StartNavigationToDistillerViewer must come before swapping the tab contents
// to avoid triggering a reload of the page. This reloadmakes it very
// difficult to distinguish between the intermediate reload and a user hitting
// the back button.
StartNavigationToDistillerViewer(new_web_contents,
old_web_contents->GetLastCommittedURL());
CoreTabHelper::FromWebContents(old_web_contents)->delegate()->SwapTabContents(
old_web_contents, new_web_contents, false, false);
StartDistillation(old_web_contents);
}
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