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// Copyright 2014 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_VIEWS_COCOA_COCOA_MOUSE_CAPTURE_H_
#define UI_VIEWS_COCOA_COCOA_MOUSE_CAPTURE_H_
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "ui/views/views_export.h"
namespace views {
class CocoaMouseCaptureDelegate;
// Basic mouse capture to simulate ::SetCapture() from Windows. This is used to
// support menu widgets (e.g. on Combo boxes). Clicking anywhere other than the
// menu should dismiss the menu and "swallow" the mouse event. All events are
// forwarded, but only events to the same application are "swallowed", which is
// consistent with how native NSMenus behave.
class VIEWS_EXPORT CocoaMouseCapture {
public:
explicit CocoaMouseCapture(CocoaMouseCaptureDelegate* delegate);
~CocoaMouseCapture();
// True if the event tap is active (i.e. not stolen by a later instance).
bool IsActive() const { return active_handle_; }
private:
class ActiveEventTap;
// Deactivates the event tap if still active.
void OnOtherClientGotCapture();
CocoaMouseCaptureDelegate* delegate_; // Weak. Owns this.
// The active event tap for this capture. Owned by this, but can be cleared
// out early if another instance of CocoaMouseCapture is created.
scoped_ptr<ActiveEventTap> active_handle_;
DISALLOW_COPY_AND_ASSIGN(CocoaMouseCapture);
};
} // namespace views
#endif // UI_VIEWS_COCOA_COCOA_MOUSE_CAPTURE_H_
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