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// Copyright (c) 2011 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_COMMAND_OBSERVER_BRIDGE
#define CHROME_BROWSER_UI_COCOA_COMMAND_OBSERVER_BRIDGE
#import <Cocoa/Cocoa.h>
#include "base/compiler_specific.h"
#include "chrome/browser/command_observer.h"
@protocol CommandObserverProtocol;
class CommandUpdater;
// A C++ bridge class that handles listening for updates to commands and
// passing them back to an object that supports the protocol delcared below.
// The observer will create one of these bridges, call ObserveCommand() on the
// command ids it cares about, and then wait for update notifications,
// delivered via -enabledStateChangedForCommand:enabled:. Destroying this
// bridge will handle automatically unregistering for updates, so there's no
// need to do that manually.
class CommandObserverBridge : public CommandObserver {
public:
CommandObserverBridge(id<CommandObserverProtocol> observer,
CommandUpdater* commands);
virtual ~CommandObserverBridge();
// Register for updates about |command|.
void ObserveCommand(int command);
protected:
// Overridden from CommandObserver
virtual void EnabledStateChangedForCommand(int command,
bool enabled) OVERRIDE;
private:
id<CommandObserverProtocol> observer_; // weak, owns me
CommandUpdater* commands_; // weak
};
// Implemented by the observing Objective-C object, called when there is a
// state change for the given command.
@protocol CommandObserverProtocol
- (void)enabledStateChangedForCommand:(NSInteger)command enabled:(BOOL)enabled;
@end
#endif // CHROME_BROWSER_UI_COCOA_COMMAND_OBSERVER_BRIDGE
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