1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CHROME_BROWSER_UI_COCOA_COMMAND_OBSERVER_BRIDGE 6 #define CHROME_BROWSER_UI_COCOA_COMMAND_OBSERVER_BRIDGE 7 #pragma once 8 9 #import <Cocoa/Cocoa.h> 10 11 #include "chrome/browser/command_updater.h" 12 13 @protocol CommandObserverProtocol; 14 15 // A C++ bridge class that handles listening for updates to commands and 16 // passing them back to an object that supports the protocol delcared below. 17 // The observer will create one of these bridges, call ObserveCommand() on the 18 // command ids it cares about, and then wait for update notifications, 19 // delivered via -enabledStateChangedForCommand:enabled:. Destroying this 20 // bridge will handle automatically unregistering for updates, so there's no 21 // need to do that manually. 22 23 class CommandObserverBridge : public CommandUpdater::CommandObserver { 24 public: 25 CommandObserverBridge(id<CommandObserverProtocol> observer, 26 CommandUpdater* commands); 27 virtual ~CommandObserverBridge(); 28 29 // Register for updates about |command|. 30 void ObserveCommand(int command); 31 32 protected: 33 // Overridden from CommandUpdater::CommandObserver 34 virtual void EnabledStateChangedForCommand(int command, bool enabled); 35 36 private: 37 id<CommandObserverProtocol> observer_; // weak, owns me 38 CommandUpdater* commands_; // weak 39 }; 40 41 // Implemented by the observing Objective-C object, called when there is a 42 // state change for the given command. 43 @protocol CommandObserverProtocol 44 - (void)enabledStateChangedForCommand:(NSInteger)command enabled:(BOOL)enabled; 45 @end 46 47 #endif // CHROME_BROWSER_UI_COCOA_COMMAND_OBSERVER_BRIDGE 48
