windows_message_handler.hpp

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/*
    Copyright 2005-2007 Adobe Systems Incorporated
    Distributed under the MIT License (see accompanying file LICENSE_1_0_0.txt
    or a copy at http://stlab.adobe.com/licenses.html)
*/

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#ifndef ADOBE_WINDOWS_MESSAGE_HANDLER_HPP
#define ADOBE_WINDOWS_MESSAGE_HANDLER_HPP

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#include <adobe/config.hpp>

#include <boost/function.hpp>
#include <boost/noncopyable.hpp>

#include <windows.h>

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namespace adobe {
    
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class message_handler_t : boost::noncopyable
{
public:
    typedef boost::function<LRESULT (HWND window, UINT message, WPARAM wparam, LPARAM lparam, WNDPROC next_proc)> callback_t;
    
    message_handler_t(callback_t callback = callback_t());

    ~message_handler_t();

    template <const char* ProcName>
    inline void install(HWND window)
        { install_implementation(window, ProcName, &win_proc<ProcName>); }
    
    void uninstall();

    inline bool is_installed() const
        { return NULL != property_m; }
    
    inline void set_callback(callback_t callback)
        { callback_m = callback; }

private:
    struct property_t
    {
        message_handler_t*  handler_m;
        WNDPROC             next_proc_m;
    };
        
    property_t* property_m;
    callback_t  callback_m;

    void install_implementation(HWND window, const char* proc_name, WNDPROC win_proc);
    
    static void set_handler_property(HWND window, const char* proc_name, property_t* property);

    static void remove_handler_property(HWND window, const char* proc_name);

    static property_t* get_handler_property(HWND window, const char* proc_name);

    static LRESULT win_proc_implementation(HWND window, UINT message, WPARAM wparam, LPARAM lparam, const char* proc_name);

    template <const char* ProcName>
    static LRESULT CALLBACK win_proc(HWND window, UINT message, WPARAM wparam, LPARAM lparam)
    {
        return win_proc_implementation(window, message, wparam, lparam, ProcName);
    }
};

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} // namespace adobe

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#endif

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