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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.
#ifndef CHROME_BROWSER_UI_SAD_TAB_HELPER_H_
#define CHROME_BROWSER_UI_SAD_TAB_HELPER_H_
#include <memory>
#include "content/public/browser/web_contents_observer.h"
#include "content/public/browser/web_contents_user_data.h"
class SadTab;
// Per-tab class to manage sad tab views. The sad tab view appears when the main
// frame of a WebContents has crashed. The behaviour depends on whether
// content::ShouldSkipEarlyCommitPendingForCrashedFrame is true or not.
//
// TODO(crbug.com/40052076): The early commit path is being removed, tidy
// these docs when that happens.
//
// If we are doing the early commit then the sad tab is removed when
// WebContentsObserver::RenderViewReady is signalled and does not come back
// unless the new frame also crashes.
//
// If we are not doing the early commit then the sad tab is removed when the new
// frame is created but the new frame is left invisible, this leaves the empty
// WebContents displaying. If the new frame commits, it becomes visible. If the
// commit is aborted, we reinstate the sad tab.
//
class SadTabHelper : public content::WebContentsObserver,
public content::WebContentsUserData<SadTabHelper> {
public:
SadTabHelper(const SadTabHelper&) = delete;
SadTabHelper& operator=(const SadTabHelper&) = delete;
~SadTabHelper() override;
SadTab* sad_tab() { return sad_tab_.get(); }
// Called when the sad tab needs to be reinstalled in the WebView,
// for example because a tab was activated, or because a tab was
// dragged to a new browser window.
void ReinstallInWebView();
private:
friend class content::WebContentsUserData<SadTabHelper>;
explicit SadTabHelper(content::WebContents* web_contents);
void InstallSadTab(base::TerminationStatus status);
// Overridden from content::WebContentsObserver:
void RenderFrameCreated(content::RenderFrameHost* render_frame_host) override;
void PrimaryMainFrameRenderProcessGone(
base::TerminationStatus status) override;
void RenderViewReady() override;
void DidFinishNavigation(
content::NavigationHandle* navigation_handle) override;
std::unique_ptr<SadTab> sad_tab_;
WEB_CONTENTS_USER_DATA_KEY_DECL();
};
#endif // CHROME_BROWSER_UI_SAD_TAB_HELPER_H_
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