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// Copyright 2025 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_TABS_CONTENTS_OBSERVING_TAB_FEATURE_H_
#define CHROME_BROWSER_UI_TABS_CONTENTS_OBSERVING_TAB_FEATURE_H_
#include "base/callback_list.h"
#include "chrome/browser/ui/tabs/public/tab_features.h"
#include "components/tabs/public/tab_interface.h"
#include "content/public/browser/web_contents_observer.h"
namespace tabs {
// Base class for tab features that need to track the state of the WebContents
// in the tab, possibly across discards. This is likely to be a common pattern
// among tab helpers that care about the tab's WebContents, so is provided as a
// convenience.
class ContentsObservingTabFeature : public content::WebContentsObserver {
public:
explicit ContentsObservingTabFeature(TabInterface& tab);
~ContentsObservingTabFeature() override;
TabInterface& tab() { return *tab_; }
const TabInterface& tab() const { return *tab_; }
protected:
// This is called when the tab contents are discarded; the `new_contents` will
// be observed after this point.
virtual void OnDiscardContents(TabInterface* tab,
content::WebContents* old_contents,
content::WebContents* new_contents);
private:
const raw_ref<TabInterface> tab_;
base::CallbackListSubscription tab_subscription_;
};
} // namespace tabs
#endif // CHROME_BROWSER_UI_TABS_CONTENTS_OBSERVING_TAB_FEATURE_H_
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