blob: dba4dc5a6ebca8297c05fdbe9a7b4bbf4d982aa4 [file] [log] [blame]
// 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 "base/macros.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 WebContents;
class Browser;
class HandoffActiveURLObserverDelegate;
// 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 HandoffActiveURLObserver : public BrowserListObserver,
public TabStripModelObserver,
public content::WebContentsObserver {
explicit HandoffActiveURLObserver(HandoffActiveURLObserverDelegate* delegate);
~HandoffActiveURLObserver() override;
// 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 DidFinishNavigation(
content::NavigationHandle* navigation_handle) 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();
// Instances of this class should be owned by their |delegate_|.
HandoffActiveURLObserverDelegate* delegate_;
// This pointer is always up to date, and points to the most recently
// activated browser, or nullptr if no browsers exist.
Browser* active_browser_;