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// Copyright 2019 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_GFX_WIN_SINGLETON_HWND_HOT_KEY_OBSERVER_H_
#define UI_GFX_WIN_SINGLETON_HWND_HOT_KEY_OBSERVER_H_
#include "base/component_export.h"
#include "base/win/windows_types.h"
#include "ui/gfx/win/singleton_hwnd_observer.h"
namespace gfx {
// We need to avoid duplicate hot key IDs for SingletonHwndObservers that call
// RegisterHotKey for SingletonHwnd. This class properly handles getting a
// unique hot key ID, registers the hotkey on construction, and unregisters the
// hot key on destruction.
//
// This class should always be used instead of directly registering hot keys on
// the SingletonHwnd with a SingletonHwndObserver in order to prevent duplicate
// hot key IDs.
class COMPONENT_EXPORT(GFX) SingletonHwndHotKeyObserver {
public:
// Registers a hot key with the given |key_code| and |modifiers| and returns
// a SingletonHwndHotKeyObserver if successful. Returns null if the hot key
// fails to register, which can happen if another application has already
// registered the hot key.
static std::unique_ptr<SingletonHwndHotKeyObserver> Create(
const SingletonHwndObserver::WndProc& wnd_proc,
UINT key_code,
int modifiers);
SingletonHwndHotKeyObserver(const SingletonHwndHotKeyObserver&) = delete;
SingletonHwndHotKeyObserver& operator=(const SingletonHwndHotKeyObserver&) =
delete;
~SingletonHwndHotKeyObserver();
private:
SingletonHwndHotKeyObserver(const SingletonHwndObserver::WndProc& wnd_proc,
int hot_key_id);
// Called by SingletonHwndObserver.
void OnWndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam);
SingletonHwndObserver observer_;
SingletonHwndObserver::WndProc wnd_proc_;
const int hot_key_id_;
};
} // namespace gfx
#endif // UI_GFX_WIN_SINGLETON_HWND_HOT_KEY_OBSERVER_H_
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