michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  *
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef __mozilla_WindowHook_h__
michael@0: #define __mozilla_WindowHook_h__
michael@0: 
michael@0: #include <windows.h>
michael@0: 
michael@0: #include <nsHashKeys.h>
michael@0: #include <nsClassHashtable.h>
michael@0: #include <nsTArray.h>
michael@0: 
michael@0: #include "nsAppShell.h"
michael@0: 
michael@0: class nsWindow;
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace widget {
michael@0: 
michael@0: struct MSGResult;
michael@0: 
michael@0: class WindowHook {
michael@0: public:
michael@0: 
michael@0:   // It is expected that most callbacks will return false
michael@0:   typedef bool (*Callback)(void *aContext, HWND hWnd, UINT nMsg,
michael@0:                              WPARAM wParam, LPARAM lParam, LRESULT *aResult);
michael@0: 
michael@0:   nsresult AddHook(UINT nMsg, Callback callback, void *context);
michael@0:   nsresult RemoveHook(UINT nMsg, Callback callback, void *context);
michael@0:   nsresult AddMonitor(UINT nMsg, Callback callback, void *context);
michael@0:   nsresult RemoveMonitor(UINT nMsg, Callback callback, void *context);
michael@0: 
michael@0: private:
michael@0:   struct CallbackData {
michael@0:     Callback cb;
michael@0:     void *context;
michael@0: 
michael@0:     CallbackData() : cb(nullptr), context(nullptr) {}
michael@0:     CallbackData(Callback cb, void *ctx) : cb(cb), context(ctx) {}
michael@0:     bool Invoke(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam,
michael@0:                   LRESULT *aResult);
michael@0:     bool operator== (const CallbackData &rhs) const {
michael@0:       return cb == rhs.cb && context == rhs.context;
michael@0:     }
michael@0:     bool operator!= (const CallbackData &rhs) const {
michael@0:       return !(*this == rhs);
michael@0:     }
michael@0:     operator bool () const {
michael@0:       return !!cb;
michael@0:     }
michael@0:   };
michael@0: 
michael@0:   typedef nsTArray<CallbackData> CallbackDataArray;
michael@0:   struct MessageData {
michael@0:     UINT nMsg;
michael@0:     CallbackData hook;
michael@0:     CallbackDataArray monitors;
michael@0:   };
michael@0: 
michael@0:   bool Notify(HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam,
michael@0:               MSGResult& aResult);
michael@0: 
michael@0:   MessageData *Lookup(UINT nMsg);
michael@0:   MessageData *LookupOrCreate(UINT nMsg);
michael@0:   void DeleteIfEmpty(MessageData *data);
michael@0: 
michael@0:   typedef nsTArray<MessageData> MessageDataArray;
michael@0:   MessageDataArray mMessageData;
michael@0: 
michael@0:   // For Notify
michael@0:   friend class ::nsWindow;
michael@0: };
michael@0: 
michael@0: }
michael@0: }
michael@0: 
michael@0: #endif // __mozilla_WindowHook_h__