chrome/browser/ui/cocoa/tabs/tab_strip_model_observer_bridge.h

// Copyright (c) 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_COCOA_TABS_TAB_STRIP_MODEL_OBSERVER_BRIDGE_H_
#define CHROME_BROWSER_UI_COCOA_TABS_TAB_STRIP_MODEL_OBSERVER_BRIDGE_H_

#import <Foundation/Foundation.h>

#include "base/compiler_specific.h"
#include "chrome/browser/ui/tabs/tab_strip_model_observer.h"

class TabStripModel;

namespace content {
class WebContents;
}

// A C++ bridge class to handle receiving notifications from the C++ tab strip
// model. When the caller allocates a bridge, it automatically registers for
// notifications from |model| and passes messages to |controller| via the
// informal protocol below. The owner of this object is responsible for deleting
// it (and thus unhooking notifications) before |controller| is destroyed.
class TabStripModelObserverBridge : public TabStripModelObserver {
 public:
  TabStripModelObserverBridge(TabStripModel* model, id controller);
  virtual ~TabStripModelObserverBridge();

  // Overridden from TabStripModelObserver
  virtual void TabInsertedAt(content::WebContents* contents,
                             int index,
                             bool foreground) OVERRIDE;
  virtual void TabClosingAt(TabStripModel* tab_strip_model,
                            content::WebContents* contents,
                            int index) OVERRIDE;
  virtual void TabDetachedAt(content::WebContents* contents,
                             int index) OVERRIDE;
  virtual void TabDeactivated(content::WebContents* contents) OVERRIDE;
  virtual void ActiveTabChanged(content::WebContents* old_contents,
                                content::WebContents* new_contents,
                                int index,
                                int reason) OVERRIDE;
  virtual void TabMoved(content::WebContents* contents,
                        int from_index,
                        int to_index) OVERRIDE;
  virtual void TabChangedAt(content::WebContents* contents,
                            int index,
                            TabChangeType change_type) OVERRIDE;
  virtual void TabReplacedAt(TabStripModel* tab_strip_model,
                             content::WebContents* old_contents,
                             content::WebContents* new_contents,
                             int index) OVERRIDE;
  virtual void TabMiniStateChanged(content::WebContents* contents,
                                   int index) OVERRIDE;
  virtual void TabStripEmpty() OVERRIDE;
  virtual void TabStripModelDeleted() OVERRIDE;

 private:
  id controller_;  // weak, owns me
  TabStripModel* model_;  // weak, owned by Browser
};

// A collection of methods which can be selectively implemented by any
// Cocoa object to receive updates about changes to a tab strip model. It is
// ok to not implement them, the calling code checks before calling.
@interface NSObject(TabStripModelBridge)
- (void)insertTabWithContents:(content::WebContents*)contents
                      atIndex:(NSInteger)index
                 inForeground:(bool)inForeground;
- (void)tabClosingWithContents:(content::WebContents*)contents
                       atIndex:(NSInteger)index;
- (void)tabDetachedWithContents:(content::WebContents*)contents
                        atIndex:(NSInteger)index;
- (void)tabDeactivatedWithContents:(content::WebContents*)contents;
- (void)activateTabWithContents:(content::WebContents*)newContents
               previousContents:(content::WebContents*)oldContents
                        atIndex:(NSInteger)index
                         reason:(int)reason;
- (void)tabMovedWithContents:(content::WebContents*)contents
                   fromIndex:(NSInteger)from
                     toIndex:(NSInteger)to;
- (void)tabChangedWithContents:(content::WebContents*)contents
                       atIndex:(NSInteger)index
                    changeType:(TabStripModelObserver::TabChangeType)change;
- (void)tabReplacedWithContents:(content::WebContents*)newContents
               previousContents:(content::WebContents*)oldContents
                        atIndex:(NSInteger)index;
- (void)tabMiniStateChangedWithContents:(content::WebContents*)contents
                                atIndex:(NSInteger)index;
- (void)tabStripEmpty;
- (void)tabStripModelDeleted;
@end

#endif  // CHROME_BROWSER_UI_COCOA_TABS_TAB_STRIP_MODEL_OBSERVER_BRIDGE_H_