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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_UI_SEARCH_INSTANT_PAGE_H_
#define CHROME_BROWSER_UI_SEARCH_INSTANT_PAGE_H_
#include <vector>
#include "base/compiler_specific.h"
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/strings/string16.h"
#include "chrome/browser/ui/search/search_model_observer.h"
#include "content/public/browser/web_contents_observer.h"
#include "ui/base/page_transition_types.h"
class GURL;
class Profile;
namespace content {
struct FrameNavigateParams;
struct LoadCommittedDetails;
class WebContents;
}
namespace gfx {
class Rect;
}
// InstantPage is used to exchange messages with a page that implements the
// Instant/Embedded Search API (http://dev.chromium.org/embeddedsearch).
// InstantPage is not used directly but via one of its derived classes,
// InstantNTP and InstantTab.
class InstantPage : public content::WebContentsObserver,
public SearchModelObserver {
public:
// InstantPage calls its delegate in response to messages received from the
// page. Each method is called with the |contents| corresponding to the page
// we are observing.
class Delegate {
public:
// Called upon determination of Instant API support. Either in response to
// the page loading or because we received some other message.
virtual void InstantSupportDetermined(const content::WebContents* contents,
bool supports_instant) = 0;
// Called when the page is about to navigate to |url|.
virtual void InstantPageAboutToNavigateMainFrame(
const content::WebContents* contents,
const GURL& url) = 0;
protected:
virtual ~Delegate();
};
~InstantPage() override;
// Returns the Instant URL that was loaded for this page. Returns the empty
// string if no URL was explicitly loaded as is the case for InstantTab.
virtual const std::string& instant_url() const;
// Returns true if the page is known to support the Instant API. This starts
// out false, and is set to true whenever we get any message from the page.
// Once true, it never becomes false (the page isn't expected to drop API
// support suddenly).
virtual bool supports_instant() const;
// Returns true if the page is the local NTP (i.e. its URL is
// chrome::kChromeSearchLocalNTPURL).
virtual bool IsLocal() const;
protected:
InstantPage(Delegate* delegate,
const std::string& instant_url,
Profile* profile);
// Sets |web_contents| as the page to communicate with. |web_contents| may be
// NULL, which effectively stops all communication.
void SetContents(content::WebContents* web_contents);
Delegate* delegate() const { return delegate_; }
Profile* profile() const { return profile_; }
// These functions are called before processing messages received from the
// page. By default, all messages are handled, but any derived classes may
// choose to ignore some or all of the received messages by overriding these
// methods.
virtual bool ShouldProcessAboutToNavigateMainFrame();
private:
FRIEND_TEST_ALL_PREFIXES(InstantPageTest, IsLocal);
FRIEND_TEST_ALL_PREFIXES(InstantPageTest,
DetermineIfPageSupportsInstant_Local);
FRIEND_TEST_ALL_PREFIXES(InstantPageTest,
DetermineIfPageSupportsInstant_NonLocal);
FRIEND_TEST_ALL_PREFIXES(InstantPageTest,
PageURLDoesntBelongToInstantRenderer);
FRIEND_TEST_ALL_PREFIXES(InstantPageTest, PageSupportsInstant);
// Overridden from content::WebContentsObserver:
void DidCommitProvisionalLoadForFrame(
content::RenderFrameHost* render_frame_host,
const GURL& url,
ui::PageTransition transition_type) override;
// Overridden from SearchModelObserver:
void ModelChanged(const SearchModel::State& old_state,
const SearchModel::State& new_state) override;
// Update the status of Instant support.
void InstantSupportDetermined(bool supports_instant);
void ClearContents();
// TODO(kmadhusu): Remove |profile_| from here and update InstantNTP to get
// |profile| from InstantNTPPrerenderer.
Profile* profile_;
Delegate* const delegate_;
const std::string instant_url_;
DISALLOW_COPY_AND_ASSIGN(InstantPage);
};
#endif // CHROME_BROWSER_UI_SEARCH_INSTANT_PAGE_H_
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