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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 UI_BASE_COCOA_TRACKING_AREA_H_
#define UI_BASE_COCOA_TRACKING_AREA_H_
#import <AppKit/AppKit.h>
#include "base/mac/scoped_nsobject.h"
#include "ui/base/ui_base_export.h"
@class CrTrackingAreaOwnerProxy;
// The CrTrackingArea can be used in place of an NSTrackingArea to shut off
// messaging to the |owner| at a specific point in time.
UI_BASE_EXPORT
@interface CrTrackingArea : NSTrackingArea {
@private
base::scoped_nsobject<CrTrackingAreaOwnerProxy> ownerProxy_;
}
// Designated initializer. Forwards all arguments to the superclass, but wraps
// |owner| in a proxy object.
- (id)initWithRect:(NSRect)rect
options:(NSTrackingAreaOptions)options
owner:(id)owner
userInfo:(NSDictionary*)userInfo;
// Prevents any future messages from being delivered to the |owner|.
- (void)clearOwner;
// Watches |window| for its NSWindowWillCloseNotification and calls
// |-clearOwner| when the notification is observed.
- (void)clearOwnerWhenWindowWillClose:(NSWindow*)window;
@end
// Scoper //////////////////////////////////////////////////////////////////////
namespace ui {
// Use an instance of this class to call |-clearOwner| on the |tracking_area_|
// when this goes out of scope.
class UI_BASE_EXPORT ScopedCrTrackingArea {
public:
// Takes ownership of |tracking_area| without retaining it.
explicit ScopedCrTrackingArea(CrTrackingArea* tracking_area = nil);
~ScopedCrTrackingArea();
// This will call |scoped_nsobject<>::reset()| to take ownership of the new
// tracking area. Note that -clearOwner is NOT called on the existing
// tracking area.
void reset(CrTrackingArea* tracking_area = nil);
CrTrackingArea* get() const;
private:
base::scoped_nsobject<CrTrackingArea> tracking_area_;
DISALLOW_COPY_AND_ASSIGN(ScopedCrTrackingArea);
};
} // namespace ui
#endif // UI_BASE_COCOA_TRACKING_AREA_H_
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