[Mac] Expose AutocompleteEditViewMac to Cocoa code.

chrome/browser/cocoa/autocomplete_text_field.h

 // Copyright (c) 2009 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_COCOA_AUTOCOMPLETE_TEXT_FIELD_H_
 #define CHROME_BROWSER_COCOA_AUTOCOMPLETE_TEXT_FIELD_H_
 
 #import <Cocoa/Cocoa.h>
 
 @class AutocompleteTextFieldCell;
 
 // AutocompleteTextField intercepts UI actions for forwarding to
 // AutocompleteEditViewMac (*), and provides a custom look.  It works
 // together with AutocompleteTextFieldEditor (mostly for intercepting
 // user actions) and AutocompleteTextFieldCell (mostly for custom
 // drawing).
 //
 // For historical reasons, chrome/browser/autocomplete is the core
 // implementation of the Omnibox.  Chrome code seems to vary between
 // autocomplete and Omnibox in describing this.
 //
 // (*) AutocompleteEditViewMac is a view in the MVC sense for the
 // Chrome internals, though it's really more of a mish-mash of model,
 // view, and controller.
 
-// AutocompleteTextFieldDelegateMethods are meant to be similar to
-// NSControl delegate methods, adding additional intercepts relevant
-// to the Omnibox implementation.
+// Provides a hook so that we can call directly down to
+// AutocompleteEditViewMac rather than traversing the delegate chain.
+
+class AutocompleteTextFieldObserver {
+ public:
+
+  // Called when the control-key state changes while the field is
+  // first responder.
+  virtual void OnControlKeyChanged(bool pressed) = 0;
+
+  // Called when the user pastes into the field.
+  virtual void OnPaste() = 0;
+};
 
 @protocol AutocompleteTextFieldDelegateMethods
-
-// Delegate -textShouldPaste: implementation to the field being
-// edited.  See AutocompleteTextFieldEditor implementation.
-- (BOOL)control:(NSControl*)control textShouldPaste:(NSText*)fieldEditor;
-
 // Returns nil if paste actions are not supported.
 - (NSString*)control:(NSControl*)control
              textPasteActionString:(NSText*)fieldEditor;
 - (void)control:(NSControl*)control textDidPasteAndGo:(NSText*)fieldEditor;
-
-// Let the delegate track -flagsChanged: events.
-- (void)control:(NSControl*)control flagsChanged:(NSEvent*)theEvent;
-
 @end
 
 @interface AutocompleteTextField : NSTextField {
+ @private
+  AutocompleteTextFieldObserver* observer_;  // weak, owned by location bar.
 }
 
-- (BOOL)textShouldPaste:(NSText*)fieldEditor;
+@property AutocompleteTextFieldObserver* observer;
 
 // Convenience method to return the cell, casted appropriately.
 - (AutocompleteTextFieldCell*)autocompleteTextFieldCell;
 
 // If the keyword, keyword hint, or search hint changed, then the
 // field needs to be relaidout.  This accomplishes that in a manner
 // which doesn't disrupt the field delegate.
 - (void)resetFieldEditorFrameIfNeeded;
 
 @end
 
 #endif  // CHROME_BROWSER_COCOA_AUTOCOMPLETE_TEXT_FIELD_H_