text: //
  //  AKActiveCallView.h
  //  Telephone
  //
  //  Copyright (c) 2008-2012 Alexei Kuznetsov. All rights reserved.
  //
  //  Redistribution and use in source and binary forms, with or without
  //  modification, are permitted provided that the following conditions are met:
  //  1. Redistributions of source code must retain the above copyright notice,
  //     this list of conditions and the following disclaimer.
  //  2. Redistributions in binary form must reproduce the above copyright notice,
  //     this list of conditions and the following disclaimer in the documentation
  //     and/or other materials provided with the distribution.
  //  3. Neither the name of the copyright holder nor the names of contributors
  //     may be used to endorse or promote products derived from this software
  //     without specific prior written permission.
  //
  //  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  //  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  //  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  //  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE THE COPYRIGHT HOLDER
  //  OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  //  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  //  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  //  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  //  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  //  OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  //  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  //
  
  #import <Cocoa/Cocoa.h>
  
  
  @protocol AKActiveCallViewDelegate;
  
  // The AKActiveCallView class receives DTMF digits |0123456789*#| and control
  // characters |mh| from the keyboard. It gives its delegate a chance to get
  // those DTMF digits and it sends control characters further.
  @interface AKActiveCallView : NSView {
   @private
    id <AKActiveCallViewDelegate> delegate_;
  }
  
  // The receiver's delegate.
  @property (nonatomic, assign) IBOutlet id <AKActiveCallViewDelegate> delegate;
  @end
  
  // Declares the interface that AKActiveCallView delegates must implement.
  @protocol AKActiveCallViewDelegate <NSObject>
  @optional
  // Sent when a view receives text input from the keyboard.
  // Now it handles only DTMF digits |0123456789*#|.
  - (void)activeCallView:(AKActiveCallView *)sender
          didReceiveText:(NSString *)aString;
  @end