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// Copyright 2012 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_BROWSER_INSTANT_CONTROLLER_H_
#define CHROME_BROWSER_UI_BROWSER_INSTANT_CONTROLLER_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/prefs/public/pref_change_registrar.h"
#include "chrome/browser/instant/instant_controller.h"
#include "chrome/browser/instant/instant_unload_handler.h"
#include "chrome/browser/ui/search/search_model_observer.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "ui/base/window_open_disposition.h"
class Browser;
struct InstantSuggestion;
class PrefRegistrySyncable;
class PrefService;
class Profile;
class ThemeService;
namespace content {
class WebContents;
}
namespace gfx {
class Rect;
}
namespace chrome {
class BrowserInstantController : public content::NotificationObserver,
public search::SearchModelObserver {
public:
explicit BrowserInstantController(Browser* browser);
virtual ~BrowserInstantController();
// Returns true if Instant is enabled in a visible, preview-showing mode.
static bool IsInstantEnabled(Profile* profile);
// Registers Instant related preferences.
static void RegisterUserPrefs(PrefService* prefs,
PrefRegistrySyncable* registry);
// If |url| is the new tab page URL, set |target_contents| to the preloaded
// NTP contents from InstantController. If |source_contents| is not NULL, we
// replace it with the new |target_contents| in the tabstrip and delete
// |source_contents|. Otherwise, the caller owns |target_contents| and is
// responsible for inserting it into the tabstrip.
//
// Returns true if and only if we update |target_contents|.
bool MaybeSwapInInstantNTPContents(
const GURL& url,
content::WebContents* source_contents,
content::WebContents** target_contents);
// Commits the current Instant, returning true on success. This is intended
// for use from OpenCurrentURL.
bool OpenInstant(WindowOpenDisposition disposition);
// Returns the Profile associated with the Browser that owns this object.
Profile* profile() const;
// Returns the InstantController or NULL if there is no InstantController for
// this BrowserInstantController.
InstantController* instant() { return &instant_; }
// Invoked by |instant_| to commit the |preview| by merging it into the active
// tab or adding it as a new tab.
void CommitInstant(scoped_ptr<content::WebContents> preview, bool in_new_tab);
// Invoked by |instant_| to autocomplete the |suggestion| into the omnibox.
void SetInstantSuggestion(const InstantSuggestion& suggestion);
// Invoked by |instant_| to get the bounds that the preview is placed at,
// in screen coordinates.
gfx::Rect GetInstantBounds();
// Invoked by |instant_| to notify that the preview gained focus, usually due
// to the user clicking on it.
void InstantPreviewFocused();
// Invoked by |instant_| to give the omnibox focus invisibly.
void FocusOmniboxInvisibly();
// Invoked by |instant_| to get the currently active tab, over which the
// preview would be shown.
content::WebContents* GetActiveWebContents() const;
// Invoked by |browser_| when the active tab changes.
void ActiveTabChanged();
// Invoked by |browser_| when the active tab is about to be deactivated.
void TabDeactivated(content::WebContents* contents);
// Invoked by |BrowserWindow| during layout to set content height which is
// used as theme area height, i.e. the height of the area that the entire
// theme background image should fill up.
void SetContentHeight(int height);
// Invoked by |instant_| to update theme information for preview.
void UpdateThemeInfoForPreview();
// Invoked by the InstantController when it wants to open a URL.
void OpenURLInCurrentTab(const GURL& url, content::PageTransition transition);
// Sets the start and end margins of the omnibox text area.
void SetMarginSize(int start, int end);
private:
// Sets the value of |instant_| based on value from profile. Invoked
// on pref change.
void ResetInstant();
// Overridden from search::SearchModelObserver:
virtual void ModeChanged(const search::Mode& old_mode,
const search::Mode& new_mode) OVERRIDE;
// content::NotificationObserver implementation.
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE;
// Helper for handling theme change.
void OnThemeChanged(ThemeService* theme_service);
// Helper for handling theme area height change.
void OnThemeAreaHeightChanged(int height);
// Replaces the contents at tab |index| with |new_contents| and deletes the
// existing contents.
void ReplaceWebContentsAt(int index,
scoped_ptr<content::WebContents> new_contents);
Browser* const browser_;
InstantController instant_;
InstantUnloadHandler instant_unload_handler_;
// Theme-related data for NTP preview to adopt themes.
bool initialized_theme_info_; // True if theme_info_ has been initialized.
ThemeBackgroundInfo theme_info_;
int theme_area_height_;
PrefChangeRegistrar profile_pref_registrar_;
content::NotificationRegistrar registrar_;
DISALLOW_COPY_AND_ASSIGN(BrowserInstantController);
};
} // namespace chrome
#endif // CHROME_BROWSER_UI_BROWSER_INSTANT_CONTROLLER_H_
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