[Mac] Implement form resubmission warning dialog

chrome/browser/cocoa/repost_form_warning_mac.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_REPOST_FORM_WARNING_MAC_H_
+#define CHROME_BROWSER_COCOA_REPOST_FORM_WARNING_MAC_H_
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/scoped_nsobject.h"
+#include "chrome/common/notification_registrar.h"
+
+class NavigationController;
+class RepostFormWarningMac;
+
+@interface RepostDelegate : NSObject {

[pink (ping after 24hrs), 2009/11/02 17:36:19]

class needs a comment. Does this really need to be public? Can't you just say
@class RepostDelegate and do the declaration in the .mm file?

[Nico, 2009/11/02 18:05:16]

Done.

+  RepostFormWarningMac* warning_;  // weak, owns us.
+}
+- (id)initWithWarning:(RepostFormWarningMac*)warning;
+- (void)alertDidEnd:(NSAlert*)alert
+         returnCode:(int)returnCode
+        contextInfo:(void*)contextInfo;
+@end
+
+class RepostFormWarningMac : public NotificationObserver {

[pink (ping after 24hrs), 2009/11/02 17:36:19]

class needs a comment. Especially needs to mention how it cleans itself up since
it appears from the use that it will leak itself and handle its own cleanup.

[Nico, 2009/11/02 18:05:16]

Done.

+ public:
+  RepostFormWarningMac(NSWindow* parent,
+                       NavigationController* navigation_controller);
+  virtual ~RepostFormWarningMac();
+
+  void Confirm();
+  void Cancel();
+
+ private:
+  // NotificationObserver implementation.
+  // Watch for a new load or a closed tab and dismiss the dialog if they occur.
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
+  // Close the sheet.  This will only be done once, even if Destroy is called
+  // multiple times (eg, from both Confirm and Observe.)
+  void Destroy();
+
+  NotificationRegistrar registrar_;
+
+  // Navigation controller, used to continue the reload.
+  NavigationController* navigation_controller_;
+
+  scoped_nsobject<NSAlert> alert_;
+  
+  scoped_nsobject<RepostDelegate> delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(RepostFormWarningMac);
+};
+
+#endif  // CHROME_BROWSER_COCOA_REPOST_FORM_WARNING_MAC_H_