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window_w32.cpp

/*M///////////////////////////////////////////////////////////////////////////////////////
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//
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//  If you do not agree to this license, do not download, install,
//  copy or use the software.
//
//
//                        Intel License Agreement
//                For Open Source Computer Vision Library
//
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// Third party copyrights are property of their respective owners.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
//   * Redistribution's of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//
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#include "_highgui.h"

#ifdef WIN32

#if _MSC_VER >= 1200
#pragma warning( disable: 4710 )
#endif

#include "commctrl.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <assert.h>

struct CvWindow;

typedef struct CvTrackbar
{
    int signature;
    HWND hwnd;
    char* name;
    CvTrackbar* next;
    CvWindow* parent;
    HWND buddy;
    int* data;
    int pos;
    int maxval;
    void (*notify)(int);
    int id;
}
CvTrackbar;


typedef struct CvWindow
{
    int signature;
    HWND hwnd;
    char* name;
    CvWindow* prev;
    CvWindow* next;
    HWND frame;

    HDC dc;
    HGDIOBJ image;
    int last_key;
    int flags;

    CvMouseCallback on_mouse;

    struct
    {
        HWND toolbar;
        int pos;
        int rows;
        WNDPROC toolBarProc;
        CvTrackbar* first;
    }
    toolbar;
}
CvWindow;


void  FillBitmapInfo( BITMAPINFO* bmi, int width, int height, int bpp, int origin )
{
    assert( bmi && width >= 0 && height >= 0 && (bpp == 8 || bpp == 24 || bpp == 32));

    BITMAPINFOHEADER* bmih = &(bmi->bmiHeader);

    memset( bmih, 0, sizeof(*bmih));
    bmih->biSize = sizeof(BITMAPINFOHEADER); 
    bmih->biWidth = width;
    bmih->biHeight = origin ? abs(height) : -abs(height);
    bmih->biPlanes = 1; 
    bmih->biBitCount = (unsigned short)bpp;
    bmih->biCompression = BI_RGB;

    if( bpp == 8 )
    {
        RGBQUAD* palette = bmi->bmiColors;
        int i;
        for( i = 0; i < 256; i++ )
        {
            palette[i].rgbBlue = palette[i].rgbGreen = palette[i].rgbRed = (BYTE)i;
            palette[i].rgbReserved = 0;
        }
    }
}


#define HG_BUDDY_WIDTH  130

#ifndef TBIF_SIZE
    #define TBIF_SIZE  0x40
#endif

#ifndef TB_SETBUTTONINFO
    #define TB_SETBUTTONINFO (WM_USER + 66)
#endif

#ifndef TBM_GETTOOLTIPS
    #define TBM_GETTOOLTIPS  (WM_USER + 30)
#endif

static LRESULT CALLBACK HighGUIProc(  HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
static LRESULT CALLBACK WindowProc(  HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
static LRESULT CALLBACK MainWindowProc(  HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
static void icvUpdateWindowPos( CvWindow* window );

static CvWindow* hg_windows = 0;
static CvWin32WindowCallback hg_on_preprocess = 0, hg_on_postprocess = 0;
static HINSTANCE hg_hinstance = 0;

HIGHGUI_IMPL int cvInitSystem( int, char** )
{
    static int wasInitialized = 0;    

    // check initialization status
    if( !wasInitialized )
    {
        // Initialize the stogare
        hg_windows = 0;
        
        // Register the class
        WNDCLASS wndc;
        wndc.style = CS_OWNDC | CS_VREDRAW | CS_HREDRAW;
        wndc.lpfnWndProc = WindowProc;
        wndc.cbClsExtra = 0;
        wndc.cbWndExtra = 0;
        wndc.hInstance = hg_hinstance;
        wndc.lpszClassName = "HighGUI class";
        wndc.lpszMenuName = "HighGUI class";
        wndc.hIcon = LoadIcon(0, IDI_APPLICATION); 
        wndc.hCursor = LoadCursor(0, MAKEINTRESOURCE(IDC_CROSS));
        wndc.hbrBackground = (HBRUSH)GetStockObject(GRAY_BRUSH);  

        RegisterClass(&wndc);

        wndc.lpszClassName = "Main HighGUI class";
        wndc.lpszMenuName = "Main HighGUI class";
        wndc.hbrBackground = (HBRUSH)GetStockObject(GRAY_BRUSH);
        wndc.lpfnWndProc = MainWindowProc;

        RegisterClass(&wndc);

        wasInitialized = 1;
    }

    return HG_OK;
}

static CvWindow* icvFindWindowByName( const char* name )
{
    CvWindow* window = hg_windows;

    for( ; window != 0 && strcmp( name, window->name) != 0; window = window->next )
        ;

    return window;
}

static CvWindow* icvWindowByHWND( HWND hwnd )
{
    CvWindow* window = (CvWindow*)GetWindowLong( hwnd, GWL_USERDATA );
    return window != 0 && window->signature == HG_WINDOW_SIGNATURE ? window : 0;
}


static CvTrackbar* icvTrackbarByHWND( HWND hwnd )
{
    CvTrackbar* trackbar = (CvTrackbar*)GetWindowLong( hwnd, GWL_USERDATA );
    return trackbar != 0 && trackbar->signature == HG_TRACKBAR_SIGNATURE &&
           trackbar->hwnd == hwnd ? trackbar : 0;    
}



HIGHGUI_IMPL int cvNamedWindow( const char* name, int flags )
{
    int result = 0;
    CV_FUNCNAME( "cvNamedWindow" );

    __BEGIN__;

    HWND hWnd, mainhWnd;
    CvWindow* window;
    DWORD defStyle = WS_VISIBLE | WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_SYSMENU;
    int len;

    cvInitSystem(0,0);

    if( !name )
        CV_ERROR( CV_StsNullPtr, "NULL name string" );

    // Check the name in the storage
    if( icvFindWindowByName( name ) != 0 )
    {
        result = 1;
        EXIT;
    }

    if( (flags & HG_AUTOSIZE) == 0 )
        defStyle |= WS_SIZEBOX;

    mainhWnd = CreateWindow( "Main HighGUI class", name, defStyle | WS_OVERLAPPED,
                             CW_USEDEFAULT, 0, 320, 320, 0, 0, hg_hinstance, 0 );
    if( !mainhWnd )
        CV_ERROR( CV_StsError, "Frame window can not be created" );

    ShowWindow(mainhWnd, SW_SHOW);

    hWnd = CreateWindow("HighGUI class", "", defStyle | WS_CHILD | WS_SIZEBOX, 
                        CW_USEDEFAULT, 0, 320, 320, mainhWnd, 0, hg_hinstance, 0);
    if( !hWnd )
        CV_ERROR( CV_StsError, "Frame window can not be created" );

    ShowWindow(hWnd, SW_SHOW);

    len = strlen(name);
    CV_CALL( window = (CvWindow*)cvAlloc(sizeof(CvWindow) + len + 1));

    window->signature = HG_WINDOW_SIGNATURE;
    window->hwnd = hWnd;
    window->frame = mainhWnd;
    window->name = (char*)(window + 1);
    memcpy( window->name, name, len + 1 );
    window->flags = flags;
    window->image = 0;
    window->dc = CreateCompatibleDC(0);
    window->last_key = 0;
    
    window->on_mouse = 0;

    memset( &window->toolbar, 0, sizeof(window->toolbar));

    window->next = hg_windows;
    window->prev = 0;
    if( hg_windows )
        hg_windows->prev = window;
    hg_windows = window;
    SetWindowLong( hWnd, GWL_USERDATA, (long)window );
    SetWindowLong( mainhWnd, GWL_USERDATA, (long)window );

    // Recalculate window position
    icvUpdateWindowPos( window );

    result = 1;
    __END__;

    return result;
}


static void icvRemoveWindow( CvWindow* window )
{
    CvTrackbar* trackbar;

    SetWindowLong( window->hwnd, GWL_USERDATA, (long)0 );
    SetWindowLong( window->frame, GWL_USERDATA, (long)0 );
    
    if( window->prev )
        window->prev->next = window->next;
    else
        hg_windows = window->next;

    if( window->next )
        window->next->prev = window->prev;

    window->prev = window->next = 0;

    if( window->image )
        DeleteObject(SelectObject(window->dc,window->image));

    if( window->dc )
        DeleteDC(window->dc);

    for( trackbar = window->toolbar.first; trackbar != 0; )
    {
        CvTrackbar* next = trackbar->next;
        cvFree( (void**)&trackbar );
        trackbar = next;
    }

    cvFree( (void**)&window );
}


HIGHGUI_IMPL void cvDestroyWindow( const char* name )
{
    CV_FUNCNAME( "cvDestroyWindow" );
    
    __BEGIN__;

    CvWindow* window;
    HWND mainhWnd;

    if(!name)
        CV_ERROR( CV_StsNullPtr, "NULL name string" );

    window = icvFindWindowByName( name );
    if( !window )
        EXIT;

    mainhWnd = window->frame;
    SendMessage(window->hwnd, WM_CLOSE, 0, 0);
    SendMessage( mainhWnd, WM_CLOSE, 0, 0);
    // Do NOT call _remove_window -- CvWindow list will be updated automatically ...

    __END__;
}


static void icvScreenToClient( HWND hwnd, RECT* rect )
{
    POINT p;
    p.x = rect->left;
    p.y = rect->top;
    ScreenToClient(hwnd, &p);
    OffsetRect( rect, p.x - rect->left, p.y - rect->top );
}


/* Calculatess the window coordinates relative to the upper left corner of the mainhWnd window */
static RECT icvCalcWindowRect( CvWindow* window )
{
    const int gutter = 1;
    RECT crect, trect, rect;

    assert(window);

    GetClientRect(window->frame, &crect);
    if(window->toolbar.toolbar)
    {
        GetWindowRect(window->toolbar.toolbar, &trect);
        icvScreenToClient(window->frame, &trect);
        SubtractRect( &rect, &crect, &trect);
    }
    else
        rect = crect;

    rect.top += gutter;
    rect.left += gutter;
    rect.bottom -= gutter;
    rect.right -= gutter;

    return rect;
}


static void icvGetBitmapData( CvWindow* window, SIZE* size, int* channels, void** data )
{
    BITMAP bmp;
    GetObject( GetCurrentObject( window->dc, OBJ_BITMAP ), sizeof(bmp), &bmp );

    if( size )
    {
        size->cx = abs(bmp.bmWidth);
        size->cy = abs(bmp.bmHeight);
    }

    if( channels )
        *channels = bmp.bmBitsPixel/8;

    if( data )
        *data = bmp.bmBits;
}


static void icvUpdateWindowPos( CvWindow* window )
{
    RECT rect;
    assert(window);

    if( (window->flags & HG_AUTOSIZE) && window->image )
    {
        int i;
        SIZE size;
        icvGetBitmapData( window, &size, 0, 0 );

        // Repeat two times because after the first resizing of the mainhWnd window 
        // toolbar may resize too
        for(i = 0; i < (window->toolbar.toolbar ? 2 : 1); i++)
        {
            RECT rmw, rw = icvCalcWindowRect(window );
            MoveWindow(window->hwnd, rw.left, rw.top, 
                rw.right - rw.left + 1, rw.bottom - rw.top + 1, FALSE);
            GetClientRect(window->hwnd, &rw);
            GetWindowRect(window->frame, &rmw);
            // Resize the mainhWnd window in order to make the bitmap fit into the child window
            MoveWindow(window->frame, rmw.left, rmw.top, 
                rmw.right - rmw.left + size.cx - rw.right + rw.left, 
                rmw.bottom  - rmw.top + size.cy - rw.bottom + rw.top, TRUE );
        }
    }
    
    rect = icvCalcWindowRect(window);
    MoveWindow(window->hwnd, rect.left, rect.top, 
               rect.right - rect.left + 1,
               rect.bottom - rect.top + 1, TRUE );
}


HIGHGUI_IMPL void
cvShowImage( const char* name, const CvArr* arr )
{
    CV_FUNCNAME( "cvShowImage" );

    __BEGIN__;
    
    CvWindow* window;
    SIZE size = { 0, 0 };
    int channels = 0;
    void* dst_ptr = 0;
    const int channels0 = 3;
    int origin = 0;
    CvMat stub, dst, *image;

    if( !name )
        CV_ERROR( CV_StsNullPtr, "NULL name" );

    window = icvFindWindowByName(name);
    if( !window || !arr )
        EXIT; // keep silence here.

    if( CV_IS_IMAGE_HDR( arr ))
        origin = ((IplImage*)arr)->origin;

    CV_CALL( image = cvGetMat( arr, &stub ));

    if( window->image )
        icvGetBitmapData( window, &size, &channels, &dst_ptr );

    if( size.cx != image->width || size.cy != image->height || channels != channels0 )
    {
        uchar buffer[sizeof(BITMAPINFO) + 255*sizeof(RGBQUAD)];
        BITMAPINFO* binfo = (BITMAPINFO*)buffer;
        
        DeleteObject( SelectObject( window->dc, window->image ));
        window->image = 0;

        size.cx = image->width;
        size.cy = image->height;
        channels = channels0;

        FillBitmapInfo( binfo, size.cx, size.cy, channels*8, 1 );

        window->image = SelectObject( window->dc, CreateDIBSection(window->dc, binfo,
                                      DIB_RGB_COLORS, &dst_ptr, 0, 0));
    }

    cvInitMatHeader( &dst, size.cy, size.cx, CV_8UC3,
                     dst_ptr, (size.cx * channels + 3) & -4 );
    cvConvertImage( image, &dst, origin == 0 );
    
    icvUpdateWindowPos(window);
    InvalidateRect(window->hwnd, 0, 0);
    UpdateWindow(window->hwnd);

    __END__;
}


HIGHGUI_IMPL void cvResizeWindow(const char* name, int width, int height )
{
    CV_FUNCNAME( "cvResizeWindow" );

    __BEGIN__;
    
    int i;
    CvWindow* window;
    RECT rmw, rw, rect;

    if( !name )
        CV_ERROR( CV_StsNullPtr, "NULL name" );

    window = icvFindWindowByName(name);
    if(!window)
        EXIT;

    // Repeat two times because after the first resizing of the mainhWnd window
    // toolbar may resize too
    for(i = 0; i < (window->toolbar.toolbar ? 2 : 1); i++)
    {
        rw = icvCalcWindowRect(window);
        MoveWindow(window->hwnd, rw.left, rw.top,
            rw.right - rw.left + 1, rw.bottom - rw.top + 1, FALSE);
        GetClientRect(window->hwnd, &rw);
        GetWindowRect(window->frame, &rmw);
        // Resize the mainhWnd window in order to make the bitmap fit into the child window
        MoveWindow(window->frame, rmw.left, rmw.top,
            rmw.right - rmw.left + width - rw.right + rw.left,
            rmw.bottom  - rmw.top + height - rw.bottom + rw.top, TRUE);
    }

    rect = icvCalcWindowRect(window);
    MoveWindow(window->hwnd, rect.left, rect.top,
        rect.right - rect.left + 1, rect.bottom - rect.top + 1, TRUE);

    __END__;
}


HIGHGUI_IMPL void cvMoveWindow( const char* name, int x, int y )
{
    CV_FUNCNAME( "cvMoveWindow" );

    __BEGIN__;

    CvWindow* window;
    RECT rect;

    if( !name )
        CV_ERROR( CV_StsNullPtr, "NULL name" );

    window = icvFindWindowByName(name);
    if(!window)
        EXIT;

    GetWindowRect( window->frame, &rect );
    MoveWindow( window->frame, x, y, rect.right - rect.left, rect.bottom - rect.top, FALSE );

    __END__;
}


static LRESULT CALLBACK
MainWindowProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
    CvWindow* window = icvWindowByHWND( hwnd );
    if( !window )
        return DefWindowProc(hwnd, uMsg, wParam, lParam);

    switch(uMsg)
    {
    case WM_DESTROY:
        icvRemoveWindow(window);
        // Do nothing!!!
        //PostQuitMessage(0);
        break;

    case WM_GETMINMAXINFO:
        if( !(window->flags & HG_AUTOSIZE) )
        {
            MINMAXINFO* minmax = (MINMAXINFO*)lParam;
            RECT rect;
            LRESULT retval = DefWindowProc(hwnd, uMsg, wParam, lParam);

            minmax->ptMinTrackSize.y = 100;
            minmax->ptMinTrackSize.x = 100;

            if( window->toolbar.first )
            {
                GetWindowRect( window->toolbar.first->hwnd, &rect );
                minmax->ptMinTrackSize.y += window->toolbar.rows*(rect.bottom - rect.top);
                minmax->ptMinTrackSize.x = rect.right - rect.left + HG_BUDDY_WIDTH;
            }
            return retval;
        }
        break;

    case WM_WINDOWPOSCHANGED:
        {
            WINDOWPOS* pos = (WINDOWPOS*)lParam;

            // Update the toolbar position/size
            if(window->toolbar.toolbar)
            {
                RECT rect;
                GetWindowRect(window->toolbar.toolbar, &rect);
                MoveWindow(window->toolbar.toolbar, 0, 0, pos->cx, rect.bottom - rect.top, TRUE);
            }

            if(!(window->flags & HG_AUTOSIZE))
                icvUpdateWindowPos(window);
            
            break;
        }

    case WM_ACTIVATE:
        if(LOWORD(wParam) == WA_ACTIVE || LOWORD(wParam) == WA_CLICKACTIVE)
            SetFocus(window->hwnd);
        break;

    case WM_ERASEBKGND:
        {
            RECT cr, tr, wrc;
            HRGN rgn, rgn1, rgn2;
            int ret;
            HDC hdc = (HDC)wParam;
            GetWindowRect(window->hwnd, &cr);
            icvScreenToClient(window->frame, &cr);
            if(window->toolbar.toolbar)
            {
                GetWindowRect(window->toolbar.toolbar, &tr);
                icvScreenToClient(window->frame, &tr);
            }
            else
                tr.left = tr.top = tr.right = tr.bottom = 0;

            GetClientRect(window->frame, &wrc);

            rgn = CreateRectRgn(0, 0, wrc.right, wrc.bottom);
            rgn1 = CreateRectRgn(cr.left, cr.top, cr.right, cr.bottom);
            rgn2 = CreateRectRgn(tr.left, tr.top, tr.right, tr.bottom);
            ret = CombineRgn(rgn, rgn, rgn1, RGN_DIFF);
            ret = CombineRgn(rgn, rgn, rgn2, RGN_DIFF);

            if(ret != NULLREGION && ret != ERROR)
                FillRgn(hdc, rgn, (HBRUSH)GetClassLong(hwnd, GCL_HBRBACKGROUND));
        }
        return 1;
    }

    return DefWindowProc(hwnd, uMsg, wParam, lParam);
}


static LRESULT CALLBACK HighGUIProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
    CvWindow* window = icvWindowByHWND(hwnd);
    if( !window )
        // This window is not mentioned in HighGUI storage
        // Actually, this should be error except for the case of calls to CreateWindow
        return DefWindowProc(hwnd, uMsg, wParam, lParam);

    // Process the message
    switch(uMsg)
    {
    case WM_WINDOWPOSCHANGING:
        {
            LPWINDOWPOS pos = (LPWINDOWPOS)lParam;
            RECT rect = icvCalcWindowRect(window);
            pos->x = rect.left;
            pos->y = rect.top;
            pos->cx = rect.right - rect.left + 1;
            pos->cy = rect.bottom - rect.top + 1;
        }
        break;

    case WM_LBUTTONDOWN:
    case WM_RBUTTONDOWN:
    case WM_MBUTTONDOWN:
    case WM_LBUTTONDBLCLK:
    case WM_RBUTTONDBLCLK:
    case WM_MBUTTONDBLCLK:
    case WM_LBUTTONUP:
    case WM_RBUTTONUP:
    case WM_MBUTTONUP:
    case WM_MOUSEMOVE:
        if( window->on_mouse )
        {
            POINT pt;
            RECT rect;
            SIZE size;

            int flags = (wParam & MK_LBUTTON ? CV_EVENT_FLAG_LBUTTON : 0)|
                        (wParam & MK_RBUTTON ? CV_EVENT_FLAG_RBUTTON : 0)|
                        (wParam & MK_MBUTTON ? CV_EVENT_FLAG_MBUTTON : 0)|
                        (wParam & MK_CONTROL ? CV_EVENT_FLAG_SHIFTKEY : 0)|
                        (wParam & MK_SHIFT ? CV_EVENT_FLAG_CTRLKEY : 0)|
                        (GetKeyState(VK_MENU) < 0 ? CV_EVENT_FLAG_ALTKEY : 0);
            int event = uMsg == WM_LBUTTONDOWN ? CV_EVENT_LBUTTONDOWN :
                        uMsg == WM_RBUTTONDOWN ? CV_EVENT_RBUTTONDOWN :
                        uMsg == WM_MBUTTONDOWN ? CV_EVENT_MBUTTONDOWN :
                        uMsg == WM_LBUTTONUP ? CV_EVENT_LBUTTONUP :
                        uMsg == WM_RBUTTONUP ? CV_EVENT_RBUTTONUP :
                        uMsg == WM_MBUTTONUP ? CV_EVENT_MBUTTONUP :
                        uMsg == WM_LBUTTONDBLCLK ? CV_EVENT_LBUTTONDBLCLK :
                        uMsg == WM_RBUTTONDBLCLK ? CV_EVENT_RBUTTONDBLCLK :
                        uMsg == WM_MBUTTONDBLCLK ? CV_EVENT_MBUTTONDBLCLK :
                                                   CV_EVENT_MOUSEMOVE;
            if( uMsg == WM_LBUTTONDOWN || uMsg == WM_RBUTTONDOWN || uMsg == WM_MBUTTONDOWN )
                SetCapture( hwnd );
            if( uMsg == WM_LBUTTONUP || uMsg == WM_RBUTTONUP || uMsg == WM_MBUTTONUP )
                ReleaseCapture();

            pt.x = LOWORD( lParam );
            pt.y = HIWORD( lParam );

            GetClientRect( window->hwnd, &rect );
            icvGetBitmapData( window, &size, 0, 0 );
            
            window->on_mouse( event, pt.x*size.cx/MAX(rect.right - rect.left,1),
                                     pt.y*size.cy/MAX(rect.bottom - rect.top,1), flags );
        }
        break;

    case WM_PAINT:
        if(window->image != 0)
        {
            int nchannels = 3;
            SIZE size;
            PAINTSTRUCT paint;
            HDC hdc;
            RGBQUAD table[256];

            // Determine the bitmap's dimensions
            icvGetBitmapData( window, &size, &nchannels, 0 );

            BeginPaint(hwnd, &paint);
            hdc = paint.hdc;
            SetStretchBltMode(hdc, COLORONCOLOR);

            if( nchannels == 1 )
            {
                int i;
                for(i = 0; i < 256; i++)
                {
                    table[i].rgbBlue = (unsigned char)i;
                    table[i].rgbGreen = (unsigned char)i;
                    table[i].rgbRed = (unsigned char)i;
                }
                SetDIBColorTable(window->dc, 0, 255, table);
            }

            if(window->flags & HG_AUTOSIZE)
            {
                BitBlt( hdc, 0, 0, size.cx, size.cy, window->dc, 0, 0, SRCCOPY );
            }
            else
            {
                RECT rect;
                GetClientRect(window->hwnd, &rect);
                StretchBlt( hdc, 0, 0, rect.right - rect.left, rect.bottom - rect.top,
                            window->dc, 0, 0, size.cx, size.cy, SRCCOPY );
            }
            DeleteDC(hdc);
            EndPaint(hwnd, &paint);
        }
        else
        {
            return DefWindowProc(hwnd, uMsg, wParam, lParam);
        }
        return 0;

    case WM_ERASEBKGND:
        if(window->image)
            return 0;
        break;
        
    case WM_DESTROY:
        icvRemoveWindow(window);
        // Do nothing!!!
        //PostQuitMessage(0);
        break;

    case WM_SETCURSOR:
        SetCursor((HCURSOR)GetClassLong(hwnd, GCL_HCURSOR));
        return 0;

    case WM_KEYDOWN:
        window->last_key = (int)wParam;
        return 0;
    }
    
    return DefWindowProc(hwnd, uMsg, wParam, lParam);
};


static LRESULT CALLBACK WindowProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
    int ret;
    
    if( hg_on_preprocess )
    {
        int was_processed = 0;
        int ret = hg_on_preprocess(hwnd, uMsg, wParam, lParam, &was_processed);
        if(was_processed)
            return ret;
    }
    
    ret = HighGUIProc(hwnd, uMsg, wParam, lParam);
    if(hg_on_postprocess)
    {
        int was_processed = 0;
        int ret = hg_on_postprocess(hwnd, uMsg, wParam, lParam, &was_processed);
        if(was_processed)
            return ret;
    }
    
    return ret;
}


static void icvUpdateTrackbar( CvTrackbar* trackbar, int pos )
{
    const int max_name_len = 10;
    const char* suffix = "";
    char pos_text[32];
    int name_len;

    if( trackbar->data )
        *trackbar->data = pos;

    if( trackbar->pos != pos )
    {
        trackbar->pos = pos;
        if( trackbar->notify )
            trackbar->notify(pos);

        name_len = strlen(trackbar->name);

        if( name_len > max_name_len )
        {
            int start_len = max_name_len*2/3;
            int end_len = max_name_len - start_len - 2;
            memcpy( pos_text, trackbar->name, start_len );
            memcpy( pos_text + start_len, "...", 3 );
            memcpy( pos_text + start_len + 3, trackbar->name + name_len - end_len, end_len + 1 );
        }
        else
        {
            memcpy( pos_text, trackbar->name, name_len + 1);
        }

        sprintf( pos_text + strlen(pos_text), "%s: %d\n", suffix, pos );
        SetWindowText( trackbar->buddy, pos_text );
    }
}


static LRESULT CALLBACK HGToolbarProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
    CvWindow* window = icvWindowByHWND( hwnd );
    if(!window)
        return DefWindowProc(hwnd, uMsg, wParam, lParam);

    // Control messages processing
    switch(uMsg)
    {
    // Slider processing
    case WM_HSCROLL:
        {
            HWND slider = (HWND)lParam;
            int pos = SendMessage(slider, TBM_GETPOS, 0, 0);
            CvTrackbar* trackbar = icvTrackbarByHWND( slider );

            if( trackbar )
            {
                if( trackbar->pos != pos )
                    icvUpdateTrackbar( trackbar, pos );
            }

            SetFocus( window->hwnd );
            return 0;
        }

    case WM_NCCALCSIZE:
        {
            LRESULT ret = CallWindowProc(window->toolbar.toolBarProc, hwnd, uMsg, wParam, lParam);
            int rows = SendMessage(hwnd, TB_GETROWS, 0, 0);

            if(window->toolbar.rows != rows)    
            {
                SendMessage(window->toolbar.toolbar, TB_BUTTONCOUNT, 0, 0);
                CvTrackbar* trackbar = window->toolbar.first;

                for( ; trackbar != 0; trackbar = trackbar->next )
                {
                    RECT rect;
                    SendMessage(window->toolbar.toolbar, TB_GETITEMRECT, 
                               (WPARAM)trackbar->id, (LPARAM)&rect);
                    MoveWindow(trackbar->hwnd, rect.left + HG_BUDDY_WIDTH, rect.top, 
                               rect.right - rect.left - HG_BUDDY_WIDTH,
                               rect.bottom - rect.top, FALSE);
                    MoveWindow(trackbar->buddy, rect.left, rect.top, 
                               HG_BUDDY_WIDTH, rect.bottom - rect.top, FALSE);
                }
                window->toolbar.rows = rows;
            }
            return ret;
        }
    }

    return CallWindowProc(window->toolbar.toolBarProc, hwnd, uMsg, wParam, lParam);
}


HIGHGUI_IMPL void
cvDestroyAllWindows(void)
{
    CvWindow* window = hg_windows;

    while( window )
    {
        HWND mainhWnd = window->frame;
        HWND hwnd = window->hwnd;
        window = window->next;

        SendMessage( hwnd, WM_CLOSE, 0, 0 );
        SendMessage( mainhWnd, WM_CLOSE, 0, 0 );
    }
}


HIGHGUI_IMPL int
cvWaitKey( int delay )
{
    int time0 = GetTickCount();

    for(;;)
    {
        CvWindow* window;
        MSG message;
        int is_processed = 0;

        if( (delay > 0 && abs(GetTickCount() - time0) >= delay) || hg_windows == 0 )
            return -1;

        if( delay <= 0 )
            GetMessage(&message, 0, 0, 0);
        else if( PeekMessage(&message, 0, 0, 0, PM_REMOVE) == FALSE )
        {
            Sleep(1);
            continue;
        }

        for( window = hg_windows; window != 0 && is_processed == 0; window = window->next )
        {
            if( window->hwnd == message.hwnd || window->frame == message.hwnd )
            {
                is_processed = 1;
                switch(message.message)
                {
                case WM_DESTROY:
                case WM_CHAR:
                    DispatchMessage(&message);
                    return (int)message.wParam;

                case WM_KEYDOWN:
                    TranslateMessage(&message);
                default:
                    DispatchMessage(&message);
                    is_processed = 1;
                    break;
                }
            }
        }

        if( !is_processed )
        {
            TranslateMessage(&message);
            DispatchMessage(&message);
        }
    }
}


static CvTrackbar*
icvFindTrackbarByName( const CvWindow* window, const char* name )
{
    CvTrackbar* trackbar = window->toolbar.first;

    for( ; trackbar != 0 && strcmp( trackbar->name, name ) != 0; trackbar = trackbar->next )
        ;

    return trackbar;
}


typedef struct
{
    UINT cbSize;
    DWORD dwMask;
    int idCommand;
    int iImage;
    BYTE fsState;
    BYTE fsStyle;
    WORD cx;
    DWORD lParam;
    LPSTR pszText;
    int cchText;
}
ButtonInfo;


HIGHGUI_IMPL int
cvCreateTrackbar( const char* trackbar_name, const char* window_name,
                  int* val, int count, CvTrackbarCallback on_notify )
{
    int result = 0;

    CV_FUNCNAME( "cvCreateTrackbar" );

    __BEGIN__;
    
    char slider_name[32];
    CvWindow* window = 0;
    CvTrackbar* trackbar = 0;
    int pos = 0;

    if( !window_name || !trackbar_name )
        CV_ERROR( CV_StsNullPtr, "NULL window or trackbar name" );

    if( count <= 0 )
        CV_ERROR( CV_StsOutOfRange, "Bad trackbar maximal value" );

    window = icvFindWindowByName(window_name);
    if( !window )
        EXIT;

    trackbar = icvFindTrackbarByName(window,trackbar_name);
    if( !trackbar )
    {
        TBBUTTON tbs;
        ButtonInfo tbis;
        RECT rect;
        int bcount;
        int len = strlen( trackbar_name );

        // create toolbar if it is not created yet
        if( !window->toolbar.toolbar )
        {
            const int default_height = 30;

            window->toolbar.toolbar = CreateToolbarEx(
                    window->frame, WS_CHILD | CCS_TOP | TBSTYLE_WRAPABLE,
                    1, 0, 0, 0, 0, 0, 16, 20, 16, 16, sizeof(TBBUTTON));
            GetClientRect(window->frame, &rect);
            MoveWindow( window->toolbar.toolbar, 0, 0,
                        rect.right - rect.left, default_height, TRUE);
            SendMessage(window->toolbar.toolbar, TB_AUTOSIZE, 0, 0);
            ShowWindow(window->toolbar.toolbar, SW_SHOW);

            window->toolbar.first = 0;
            window->toolbar.pos = 0;
            window->toolbar.rows = 0;
            window->toolbar.toolBarProc =
                (WNDPROC)GetWindowLong(window->toolbar.toolbar, GWL_WNDPROC);

            icvUpdateWindowPos(window);

            // Subclassing from toolbar
            SetWindowLong(window->toolbar.toolbar, GWL_WNDPROC, (LONG)HGToolbarProc);
            SetWindowLong(window->toolbar.toolbar, GWL_USERDATA, (LONG)window);
        }

        /* Retrieve current buttons count */
        bcount = SendMessage(window->toolbar.toolbar, TB_BUTTONCOUNT, 0, 0);

        if(bcount > 1)
        {
            /* If this is not the first button then we need to
            separate it from the previous one */
            tbs.iBitmap = 0;
            tbs.idCommand = bcount; // Set button id to it's number
            tbs.iString = 0;
            tbs.fsStyle = TBSTYLE_SEP;
            tbs.fsState = TBSTATE_ENABLED;
            SendMessage(window->toolbar.toolbar, TB_ADDBUTTONS, 1, (LPARAM)&tbs);

            // Retrieve current buttons count
            bcount = SendMessage(window->toolbar.toolbar, TB_BUTTONCOUNT, 0, 0);
        }

        /* Add a button which we're going to cover with the slider */
        tbs.iBitmap = 0;
        tbs.idCommand = bcount; // Set button id to it's number
        tbs.iString = 0;
        tbs.fsStyle = TBSTYLE_GROUP;
        tbs.fsState = TBSTATE_ENABLED;
        SendMessage(window->toolbar.toolbar, TB_ADDBUTTONS, 1, (LPARAM)&tbs);

        /* Adjust button size to the slider */
        tbis.cbSize = sizeof(tbis);
        tbis.dwMask = TBIF_SIZE;

        GetClientRect(window->hwnd, &rect);
        tbis.cx = (unsigned short)(rect.right - rect.left);

        SendMessage(window->toolbar.toolbar, TB_SETBUTTONINFO,
            (WPARAM)tbs.idCommand, (LPARAM)&tbis);

        /* Get button position */
        SendMessage(window->toolbar.toolbar, TB_GETITEMRECT,
            (WPARAM)tbs.idCommand, (LPARAM)&rect);

        /* Create a slider */
        trackbar = (CvTrackbar*)cvAlloc( sizeof(CvTrackbar) + len + 1 );
        trackbar->signature = HG_TRACKBAR_SIGNATURE;
        trackbar->notify = 0;
        trackbar->parent = window;
        trackbar->pos = 0;
        trackbar->data = 0;
        trackbar->id = bcount;
        trackbar->next = window->toolbar.first;
        trackbar->name = (char*)(trackbar + 1);
        memcpy( trackbar->name, trackbar_name, len + 1 );
        window->toolbar.first = trackbar;
        
        sprintf(slider_name, "Trackbar%p", val);
        trackbar->hwnd = CreateWindowEx(0, TRACKBAR_CLASS, slider_name,
                            WS_CHILD | WS_VISIBLE | TBS_AUTOTICKS |
                            TBS_FIXEDLENGTH | TBS_HORZ | TBS_BOTTOM,
                            rect.left + HG_BUDDY_WIDTH, rect.top,
                            rect.right - rect.left - HG_BUDDY_WIDTH,
                            rect.bottom - rect.top, window->toolbar.toolbar,
                            (HMENU)bcount, hg_hinstance, 0);

        sprintf(slider_name,"Buddy%p", val);
        trackbar->buddy = CreateWindowEx(0, "STATIC", slider_name,
                            WS_CHILD | SS_RIGHT,
                            rect.left, rect.top,
                            HG_BUDDY_WIDTH, rect.bottom - rect.top,
                            window->toolbar.toolbar, 0, hg_hinstance, 0);

        SetWindowLong( trackbar->hwnd, GWL_USERDATA, (LONG)trackbar );
        
        /* Minimize the number of rows */
        SendMessage( window->toolbar.toolbar, TB_SETROWS,
                     MAKEWPARAM(1, FALSE), (LPARAM)&rect );
    }
    else
    {
        trackbar->data = 0;
        trackbar->notify = 0;
    }

    trackbar->maxval = count;

    /* Adjust slider parameters */
    SendMessage(trackbar->hwnd, TBM_SETRANGE, (WPARAM)TRUE, (LPARAM)MAKELONG(0, count));
    SendMessage(trackbar->hwnd, TBM_SETTICFREQ, (WPARAM)1, (LPARAM)0 );
    if( val )
        pos = *val;

    SendMessage(trackbar->hwnd, TBM_SETPOS, (WPARAM)TRUE, (LPARAM)pos );
    SendMessage(window->toolbar.toolbar, TB_AUTOSIZE, 0, 0);

    trackbar->pos = -1;
    icvUpdateTrackbar( trackbar, pos );
    ShowWindow( trackbar->buddy, SW_SHOW );

    trackbar->notify = on_notify;
    trackbar->data = val;

    /* Resize the window to reflect the toolbar resizing*/
    icvUpdateWindowPos(window);

    result = 1;

    __END__;

    return result;
}


HIGHGUI_IMPL void
cvSetMouseCallback( const char* window_name, CvMouseCallback on_mouse )
{
    CV_FUNCNAME( "cvSetMouseCallback" );

    __BEGIN__;
    
    CvWindow* window = 0;

    if( !window_name )
        CV_ERROR( CV_StsNullPtr, "NULL window name" );

    window = icvFindWindowByName(window_name);
    if( !window )
        EXIT;

    window->on_mouse = on_mouse;

    __END__;
}


HIGHGUI_IMPL int cvGetTrackbarPos( const char* trackbar_name, const char* window_name )
{
    int pos = -1;
    
    CV_FUNCNAME( "cvGetTrackbarPos" );

    __BEGIN__;

    CvWindow* window;
    CvTrackbar* trackbar = 0;

    if( trackbar_name == 0 || window_name == 0 )
        CV_ERROR( CV_StsNullPtr, "NULL trackbar or window name" );

    window = icvFindWindowByName( window_name );
    if( window )
        trackbar = icvFindTrackbarByName( window, trackbar_name );

    if( trackbar )
        pos = trackbar->pos;

    __END__;

    return pos;
}


HIGHGUI_IMPL void cvSetTrackbarPos( const char* trackbar_name, const char* window_name, int pos )
{
    CV_FUNCNAME( "cvSetTrackbarPos" );

    __BEGIN__;

    CvWindow* window;
    CvTrackbar* trackbar = 0;

    if( trackbar_name == 0 || window_name == 0 )
        CV_ERROR( CV_StsNullPtr, "NULL trackbar or window name" );

    window = icvFindWindowByName( window_name );
    if( window )
        trackbar = icvFindTrackbarByName( window, trackbar_name );

    if( trackbar )
    {
        if( pos < 0 )
            pos = 0;

        if( pos > trackbar->maxval )
            pos = trackbar->maxval;

        SendMessage( trackbar->hwnd, TBM_SETPOS, (WPARAM)TRUE, (LPARAM)pos );
        icvUpdateTrackbar( trackbar, pos );
    }

    __END__;
}


HIGHGUI_IMPL void* cvGetWindowHandle( const char* window_name )
{
    void* hwnd = 0;
    
    CV_FUNCNAME( "cvGetWindowHandle" );

    __BEGIN__;

    CvWindow* window;

    if( window_name == 0 )
        CV_ERROR( CV_StsNullPtr, "NULL window name" );

    window = icvFindWindowByName( window_name );
    if( window )
        hwnd = (void*)window->hwnd;

    __END__;

    return hwnd;
}
    

HIGHGUI_IMPL const char* cvGetWindowName( void* window_handle )
{
    const char* window_name = "";
    
    CV_FUNCNAME( "cvGetWindowName" );

    __BEGIN__;

    CvWindow* window;

    if( window_handle == 0 )
        CV_ERROR( CV_StsNullPtr, "NULL window" );

    window = icvWindowByHWND( (HWND)window_handle );
    if( window )
        window_name = window->name;

    __END__;

    return window_name;
}



void set_preprocess_func(int (__cdecl *on_preprocess)(HWND, UINT, WPARAM, LPARAM, int*))
{
    if(on_preprocess)
        hg_on_preprocess = on_preprocess;
    else
        assert(on_preprocess);
}


void set_postprocess_func(int (__cdecl *on_postprocess)(HWND, UINT, WPARAM, LPARAM, int*))
{
    if(on_postprocess)
        hg_on_postprocess = on_postprocess;
    else
        assert(on_postprocess);
}

#endif //WIN32

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