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// Copyright 2014 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_COCOA_HANDOFF_OBSERVER_H_
#define CHROME_BROWSER_UI_COCOA_HANDOFF_OBSERVER_H_
#import <Cocoa/Cocoa.h>
#include "base/memory/raw_ptr.h"
#include "chrome/browser/ui/browser_list_observer.h"
#include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
#include "content/public/browser/web_contents_observer.h"
namespace content {
class Page;
class WebContents;
} // namespace content
class Browser;
// A protocol that allows ObjC objects to receive delegate callbacks from
// HandoffObserver.
@protocol HandoffObserverDelegate
- (void)handoffContentsChanged:(content::WebContents*)webContents;
@end
// This class observes changes to the "active URL". This is defined as the
// visible URL of the WebContents of the selected tab of the most recently
// focused browser window.
class HandoffObserver : public BrowserListObserver,
public TabStripModelObserver,
public content::WebContentsObserver {
public:
explicit HandoffObserver(NSObject<HandoffObserverDelegate>* delegate);
HandoffObserver(const HandoffObserver&) = delete;
HandoffObserver& operator=(const HandoffObserver&) = delete;
~HandoffObserver() override;
private: // BrowserListObserver
void OnBrowserSetLastActive(Browser* browser) override;
void OnBrowserRemoved(Browser* browser) override;
// TabStripModelObserver
void OnTabStripModelChanged(
TabStripModel* tab_strip_model,
const TabStripModelChange& change,
const TabStripSelectionChange& selection) override;
// content::WebContentsObserver
void PrimaryPageChanged(content::Page& page) override;
void TitleWasSet(content::NavigationEntry* entry) override;
// Updates the active browser.
void SetActiveBrowser(Browser* active_browser);
// Makes this object start observing the WebContents, if it is not already
// doing so. This method is idempotent.
void StartObservingWebContents(content::WebContents* web_contents);
// Makes this object stop observing the WebContents.
void StopObservingWebContents();
// Returns the active WebContents. May return nullptr.
content::WebContents* GetActiveWebContents();
// This pointer is always up to date, and points to the most recently
// activated browser, or nullptr if no browsers exist.
raw_ptr<Browser> active_browser_ = nullptr;
// Instances of this class should be owned by their |delegate_|.
NSObject<HandoffObserverDelegate>* __weak delegate_;
};
#endif // CHROME_BROWSER_UI_COCOA_HANDOFF_OBSERVER_H_
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