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// Copyright 2013 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.
#ifndef CHROME_BROWSER_SEARCH_SEARCH_TERMS_TRACKER_H_
#define CHROME_BROWSER_SEARCH_SEARCH_TERMS_TRACKER_H_
#include <map>
#include "base/macros.h"
#include "base/strings/string16.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
namespace content {
class NavigationController;
class WebContents;
}
namespace chrome {
// Observes navigation events (and WebContents destructions) to keep track of
// search terms associated with a WebContents. Essentially, as long as there are
// only web-triggerable navigations following a search results page, this class
// will consider the search terms from that SRP as the "current" search terms.
// Any other type of navigation will invalidate the search terms. The search
// terms are being tracked so they can be displayed in the location bar for
// related navigations that occur after a search.
class SearchTermsTracker : public content::NotificationObserver {
public:
SearchTermsTracker();
~SearchTermsTracker() override;
// Returns the current search terms and navigation index of the corresponding
// search results page for the specified WebContents. This function will
// return true if there are valid search terms for |contents|. |search_terms|
// and/or |navigation_index| can be NULL if not needed.
bool GetSearchTerms(const content::WebContents* contents,
base::string16* search_terms,
int* navigation_index) const;
// content::NotificationObserver
void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) override;
private:
struct TabData {
TabData() : srp_navigation_index(-1) {}
base::string16 search_terms;
int srp_navigation_index;
};
// Keeps information about the specified WebContents.
typedef std::map<const content::WebContents*, TabData> TabState;
// Searches for the most recent search and, if found, fills |tab_data| with
// information about that search and returns true.
bool FindMostRecentSearch(const content::NavigationController* controller,
TabData* tab_data);
// Removes the TabData entry associated to the specified |contents|.
void RemoveTabData(const content::WebContents* contents);
content::NotificationRegistrar registrar_;
TabState tabs_;
DISALLOW_COPY_AND_ASSIGN(SearchTermsTracker);
};
} // namespace chrome
#endif // CHROME_BROWSER_SEARCH_SEARCH_TERMS_TRACKER_H_
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