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// Copyright 2021 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_TAB_CONTENTS_WEB_CONTENTS_COLLECTION_H_
#define CHROME_BROWSER_TAB_CONTENTS_WEB_CONTENTS_COLLECTION_H_
#include <memory>
#include "base/containers/flat_map.h"
#include "base/memory/raw_ptr.h"
#include "content/public/browser/web_contents_observer.h"
namespace content {
class WebContents;
} // namespace content
// Utility class for receiving `WebContentsObserver` callbacks from sets of
// `WebContents`. Manages a set of `WebContentsObserver` which forward their
// callbacks annotated with the WebContents they occurred in to an observer. The
// collection ensures that observer lifetimes are properly handled.
class WebContentsCollection {
public:
class Observer {
public:
// Observer callbacks that will be fired from each web contents being
// watched in `web_contents_observers_`.
virtual void WebContentsDestroyed(content::WebContents* web_contents) {}
virtual void RenderProcessGone(content::WebContents* web_contents,
base::TerminationStatus status) {}
virtual void DidFinishNavigation(
content::WebContents* web_contents,
content::NavigationHandle* navigation_handle) {}
virtual void DidStartLoading(content::WebContents* web_contents) {}
protected:
virtual ~Observer() = default;
};
// `observer` must outlive `this`.
explicit WebContentsCollection(Observer* observer);
~WebContentsCollection();
// Start forwarding `WebContentsObserver` calls from `web_contents` to
// `observer_`.
void StartObserving(content::WebContents* web_contents);
// Stops `observer_` from receiving calls from `web_contents`.
void StopObserving(content::WebContents* web_contents);
private:
class ForwardingWebContentsObserver;
void WebContentsDestroyed(content::WebContents* web_contents);
// Observer which will receive callbacks from any of the `WebContentsObserver`
// in `web_contents_observers_`.
const raw_ptr<Observer> observer_;
// Map of observers for the WebContents part of this collection.
base::flat_map<content::WebContents*,
std::unique_ptr<ForwardingWebContentsObserver>>
web_contents_observers_;
};
#endif // CHROME_BROWSER_TAB_CONTENTS_WEB_CONTENTS_COLLECTION_H_
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