source: downloads/OgreMain/src/OgreWindowEventUtilities.cpp @ 3

/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2006 Torus Knot Software Ltd
Also see acknowledgements in Readme.html

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.

You may alternatively use this source under the terms of a specific version of
the OGRE Unrestricted License provided you have obtained such a license from
Torus Knot Software Ltd.
-----------------------------------------------------------------------------
*/
#include "OgreStableHeaders.h"
#include "OgreWindowEventUtilities.h"
#include "OgreRenderWindow.h"
#include "OgreLogManager.h"
#include "OgreRoot.h"
#include "OgreException.h"

#if OGRE_PLATFORM == OGRE_PLATFORM_LINUX
#include <X11/Xlib.h>
void GLXProc( const XEvent &event );
#endif

using namespace Ogre;

WindowEventUtilities::WindowEventListeners WindowEventUtilities::_msListeners;
WindowEventUtilities::Windows WindowEventUtilities::_msWindows;

//--------------------------------------------------------------------------------//
void WindowEventUtilities::messagePump()
{
#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
        // Windows Message Loop (NULL means check all HWNDs belonging to this context)
        MSG  msg;
        while( PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ) )
        {
                TranslateMessage( &msg );
                DispatchMessage( &msg );
        }
#elif OGRE_PLATFORM == OGRE_PLATFORM_LINUX
        //GLX Message Pump (Display is probably Common for all RenderWindows.. But, to be safe loop
        //through all)
        Windows::iterator i = _msWindows.begin(), e = _msWindows.end();
        for( ; i != e; ++i )
        {
                ::Display* display;
                (*i)->getCustomAttribute("DISPLAY", &display);
                while(XPending(display) > 0)
                {
                        XEvent event;
                        XNextEvent(display, &event);
                        GLXProc(event);
                }
        }
        #elif OGRE_PLATFORM == OGRE_PLATFORM_APPLE
        // OSX Message Pump
        EventRef event = NULL;
        EventTargetRef targetWindow;
        targetWindow = GetEventDispatcherTarget();
        if( ReceiveNextEvent( 0, NULL, kEventDurationNoWait, true, &event ) == noErr )
        {
                SendEventToEventTarget( event, targetWindow );
                ReleaseEvent( event );
        }
#endif
}

//--------------------------------------------------------------------------------//
void WindowEventUtilities::addWindowEventListener( RenderWindow* window, WindowEventListener* listener )
{
        _msListeners.insert(std::make_pair(window, listener));
}

//--------------------------------------------------------------------------------//
void WindowEventUtilities::removeWindowEventListener( RenderWindow* window, WindowEventListener* listener )
{
        WindowEventListeners::iterator i = _msListeners.begin(), e = _msListeners.end();

        for( ; i != e; ++i )
        {
                if( i->first == window && i->second == listener )
                {
                        _msListeners.erase(i);
                        break;
                }
        }
}

//--------------------------------------------------------------------------------//
void WindowEventUtilities::_addRenderWindow(RenderWindow* window)
{
        _msWindows.push_back(window);
}

//--------------------------------------------------------------------------------//
void WindowEventUtilities::_removeRenderWindow(RenderWindow* window)
{
        Windows::iterator i = std::find(_msWindows.begin(), _msWindows.end(), window);
        if( i != _msWindows.end() )
                _msWindows.erase( i );
}

#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
//--------------------------------------------------------------------------------//
LRESULT CALLBACK WindowEventUtilities::_WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
        if (uMsg == WM_CREATE)
        {       // Store pointer to Win32Window in user data area
                SetWindowLongPtr(hWnd, GWLP_USERDATA, (LONG)(((LPCREATESTRUCT)lParam)->lpCreateParams));
                return 0;
        }

        // look up window instance
        // note: it is possible to get a WM_SIZE before WM_CREATE
        RenderWindow* win = (RenderWindow*)GetWindowLongPtr(hWnd, GWLP_USERDATA);
        if (!win)
                return DefWindowProc(hWnd, uMsg, wParam, lParam);

        //LogManager* log = LogManager::getSingletonPtr();
        //Iterator of all listeners registered to this RenderWindow
        WindowEventListeners::iterator start = _msListeners.lower_bound(win),
                                                end = _msListeners.upper_bound(win);

        switch( uMsg )
        {
        case WM_ACTIVATE:
        {
                bool active = (LOWORD(wParam) != WA_INACTIVE);
                win->setActive( active );
                for( ; start != end; ++start )
                        (start->second)->windowFocusChange(win);
                break;
        }
        case WM_SYSKEYDOWN:
                switch( wParam )
                {
                case VK_CONTROL:
                case VK_SHIFT:
                case VK_MENU: //ALT
                        //return zero to bypass defProc and signal we processed the message
                        return 0;
                }
                break;
        case WM_SYSKEYUP:
                switch( wParam )
                {
                case VK_CONTROL:
                case VK_SHIFT:
                case VK_MENU: //ALT
                case VK_F10:
                        //return zero to bypass defProc and signal we processed the message
                        return 0;
                }
                break;
        case WM_SYSCHAR:
                // return zero to bypass defProc and signal we processed the message, unless it's an ALT-space
                if (wParam != VK_SPACE)
                        return 0;
                break;
        case WM_ENTERSIZEMOVE:
                //log->logMessage("WM_ENTERSIZEMOVE");
                break;
        case WM_EXITSIZEMOVE:
                //log->logMessage("WM_EXITSIZEMOVE");
                break;
        case WM_MOVE:
                //log->logMessage("WM_MOVE");
                win->windowMovedOrResized();
                for( ; start != end; ++start )
                        (start->second)->windowMoved(win);
                break;
        case WM_DISPLAYCHANGE:
                win->windowMovedOrResized();
                for( ; start != end; ++start )
                        (start->second)->windowResized(win);
                break;
        case WM_SIZE:
                //log->logMessage("WM_SIZE");
                win->windowMovedOrResized();
                for( ; start != end; ++start )
                        (start->second)->windowResized(win);
                break;
        case WM_GETMINMAXINFO:
                // Prevent the window from going smaller than some minimu size
                ((MINMAXINFO*)lParam)->ptMinTrackSize.x = 100;
                ((MINMAXINFO*)lParam)->ptMinTrackSize.y = 100;
                break;
        case WM_CLOSE:
                //log->logMessage("WM_CLOSE");
                win->destroy();
                for( ; start != end; ++start )
                        (start->second)->windowClosed(win);
                return 0;
        }

        return DefWindowProc( hWnd, uMsg, wParam, lParam );
}
#elif OGRE_PLATFORM == OGRE_PLATFORM_LINUX
//--------------------------------------------------------------------------------//
void GLXProc( const XEvent &event )
{
        //We have to find appropriate window based on window id ( kindof hackish :/,
        //but at least this only happens when there is a Window's event - and not that often
        WindowEventUtilities::Windows::iterator i = WindowEventUtilities::_msWindows.begin(),
                                                e = WindowEventUtilities::_msWindows.end();
        RenderWindow* win = 0;
        for(; i != e; ++i )
        {
                std::size_t wind = 0;
                (*i)->getCustomAttribute("WINDOW", &wind);
                if( event.xany.window == wind )
                {
                        win = *i;
                        break;
                }
        }

        //Sometimes, seems we get other windows, so just ignore
        if( win == 0 ) return;

        //Now that we have the correct RenderWindow for the generated Event, get an iterator for the listeners
        WindowEventUtilities::WindowEventListeners::iterator 
                start = WindowEventUtilities::_msListeners.lower_bound(win),
                end   = WindowEventUtilities::_msListeners.upper_bound(win);

        switch(event.type)
        {
        case ClientMessage:
        {
                ::Atom atom;
                win->getCustomAttribute("ATOM", &atom);
                if(event.xclient.format == 32 && event.xclient.data.l[0] == (long)atom)
                {       //Window Closed (via X button)
                        //Send message first, to allow app chance to unregister things that need done before
                        //window is shutdown
                        for( ; start != end; ++start )
                                (start->second)->windowClosed(win);
                        win->destroy();
                }
                break;
        }
        case ConfigureNotify:   //Moving or Resizing
                unsigned int width, height, depth;
                int left, top;
                win->getMetrics(width, height, depth, left, top);

                //determine if moving or sizing:
                if( left == event.xconfigure.x && top == event.xconfigure.y )
                {       //Resize width, height
                        win->windowMovedOrResized();
                        for( ; start != end; ++start )
                                (start->second)->windowResized(win);
                }
                else if( width == event.xconfigure.width && height == event.xconfigure.height )
                {       //Moving x, y
                        win->windowMovedOrResized();
                        for( ; start != end; ++start )
                                (start->second)->windowMoved(win);
                }
                break;
        case MapNotify:   //Restored
                win->setActive( true );
                for( ; start != end; ++start )
                        (start->second)->windowFocusChange(win);
                break;
        case UnmapNotify: //Minimised
                win->setActive( false );
                win->setVisible( false );
                for( ; start != end; ++start )
                        (start->second)->windowFocusChange(win);
                break;
        case VisibilityNotify:
                switch(event.xvisibility.state)
                {
                case VisibilityUnobscured:
                        win->setActive( true );
                        win->setVisible( true );
                        break;
                case VisibilityPartiallyObscured:
                        win->setActive( true );
                        win->setVisible( true );
                        break;
                case VisibilityFullyObscured:
                        win->setActive( false );
                        win->setVisible( false );
                        break;
                }

                //Notify Listeners that focus of window has changed in some way
                for( ; start != end; ++start )
                        (start->second)->windowFocusChange(win);
                break;
        default:
                break;
        } //End switch event.type
}
#endif