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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_REMOTE_COCOA_APP_SHIM_MOUSE_CAPTURE_H_
#define COMPONENTS_REMOTE_COCOA_APP_SHIM_MOUSE_CAPTURE_H_
#import <Cocoa/Cocoa.h>
#include <memory>
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "components/remote_cocoa/app_shim/remote_cocoa_app_shim_export.h"
namespace remote_cocoa {
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 REMOTE_COCOA_APP_SHIM_EXPORT CocoaMouseCapture {
public:
explicit CocoaMouseCapture(CocoaMouseCaptureDelegate* delegate);
CocoaMouseCapture(const CocoaMouseCapture&) = delete;
CocoaMouseCapture& operator=(const CocoaMouseCapture&) = delete;
~CocoaMouseCapture();
// Returns the NSWindow with capture or nil if no window has capture
// currently.
static NSWindow* GetGlobalCaptureWindow();
// 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();
raw_ptr<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.
std::unique_ptr<ActiveEventTap> active_handle_;
base::WeakPtrFactory<CocoaMouseCapture> factory_{this};
};
} // namespace remote_cocoa
#endif // COMPONENTS_REMOTE_COCOA_APP_SHIM_MOUSE_CAPTURE_H_
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