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// Copyright 2011 The Chromium Authors
// 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/component_export.h"
// The CrTrackingArea can be used in place of an NSTrackingArea to shut off
// messaging to the |owner| at a specific point in time.
COMPONENT_EXPORT(UI_BASE)
@interface CrTrackingArea : NSTrackingArea
// Designated initializer. Forwards all arguments to the superclass, but wraps
// |owner| in a proxy object.
- (instancetype)initWithRect:(NSRect)rect
options:(NSTrackingAreaOptions)options
owner:(id)owner
userInfo:(NSDictionary*)userInfo;
// Prevents any future messages from being delivered to the |owner|.
- (void)clearOwner;
@end
// Scoper //////////////////////////////////////////////////////////////////////
namespace ui {
// Use an instance of this class to call |-clearOwner| on the |tracking_area_|
// when this goes out of scope.
class COMPONENT_EXPORT(UI_BASE) ScopedCrTrackingArea {
public:
// Takes ownership of |tracking_area|.
explicit ScopedCrTrackingArea(CrTrackingArea* tracking_area = nil);
ScopedCrTrackingArea(const ScopedCrTrackingArea&) = delete;
ScopedCrTrackingArea& operator=(const ScopedCrTrackingArea&) = delete;
~ScopedCrTrackingArea();
// This will 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:
CrTrackingArea* __strong tracking_area_;
};
} // namespace ui
#endif // UI_BASE_COCOA_TRACKING_AREA_H_
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