windows-nt/Source/XPSP1/NT/com/oleutest/letest/ole2ui/iconbox.c

/*
 * ICONBOX.C
 *
 * Implemenatation of an IconBox control for OLE 2.0 UI dialogs that we'll
 * use wherever a dialog needs an icon/label display.  Through the control's
 * interface we can change the image or control label visibility.
 *
 * The IconBox discusses images in CF_METAFILEPICT format.  When drawing
 * such a metafile, the entire aspect is centered in the IconBox, so long
 * labels are chopped at either end.
 *
 * Copyright (c)1992 Microsoft Corporation, All Right Reserved
 */


#define STRICT  1
#include "ole2ui.h"
#include "iconbox.h"


//Flag indicating if we've registered the class
static BOOL     fRegistered=FALSE;


/*
 * FIconBoxInitialize
 *
 * Purpose:
 *  Registers the IconBox control class.
 *
 * Parameters:
 *  hInst           HINSTANCE instance of the DLL.
 *
 *  hPrevInst       HINSTANCE of the previous instance.  Used to
 *                  determine whether to register window classes or not.
 *
 *  lpszClassName   LPSTR containing the class name to register the
 *                  IconBox control class with.
 *
 * Return Value:
 *  BOOL            TRUE if all initialization succeeded, FALSE otherwise.
 */

BOOL FIconBoxInitialize(HINSTANCE hInst, HINSTANCE hPrevInst, LPTSTR lpszClassName)
    {
    WNDCLASS        wc;

    // Only register class if we're the first instance
    if (hPrevInst)
        fRegistered = TRUE;
    else
        {

        // Static flag fRegistered guards against calling this function more
        // than once
        if (!fRegistered)
            {
            wc.lpfnWndProc   =IconBoxWndProc;
            wc.cbClsExtra    =0;
            wc.cbWndExtra    =CBICONBOXWNDEXTRA;
            wc.hInstance     =hInst;
            wc.hIcon         =NULL;
            wc.hCursor       =LoadCursor(NULL, IDC_ARROW);
            wc.hbrBackground =(HBRUSH)NULL;
            wc.lpszMenuName  =NULL;
            wc.lpszClassName =lpszClassName;
            wc.style         =CS_GLOBALCLASS | CS_VREDRAW | CS_HREDRAW;

            fRegistered=RegisterClass(&wc);
            }
        }

    return fRegistered;
}


/*
 * IconBoxUninitialize
 *
 * Purpose:
 *  Cleans up anything done in FIconBoxInitialize.  Currently there is
 *  nothing, but we do this for symmetry.
 *
 * Parameters:
 *  None
 *
 * Return Value:
 *  None
 */

void IconBoxUninitialize(void)
    {
    //Nothing to do.
    return;
    }






/*
 * IconBoxWndProc
 *
 * Purpose:
 *  Window Procedure for the IconBox custom control.  Only handles
 *  WM_CREATE, WM_PAINT, and private messages to manipulate the image.
 *
 * Parameters:
 *  Standard
 *
 * Return Value:
 *  Standard
 */

LONG CALLBACK EXPORT IconBoxWndProc(HWND hWnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
    {
    HGLOBAL         hMF=NULL;
    PAINTSTRUCT     ps;
    HDC             hDC;
    RECT            rc;


    //Handle standard Windows messages.
    switch (iMsg)
        {
        case WM_CREATE:
            SetWindowLong(hWnd, IBWW_HIMAGE, 0);
            SetWindowWord(hWnd, IBWW_FLABEL, TRUE);
            return 0L;


        case WM_ERASEBKGND:
        {

           HBRUSH hBrush;
           RECT   Rect;
#if defined( WIN32 )
           POINT  point;
#endif

           GetClientRect(hWnd, &Rect);
#if defined( WIN32 )
           hBrush = (HBRUSH)SendMessage(GetParent(hWnd),
                                        WM_CTLCOLORDLG,
                                        wParam,
                                        (LPARAM)GetParent(hWnd));
#else
           hBrush = (HBRUSH)SendMessage(GetParent(hWnd),
                                        WM_CTLCOLOR,
                                        wParam,
                                        MAKELPARAM(GetParent(hWnd), CTLCOLOR_DLG));
#endif


           if (!hBrush)
             return FALSE;

           UnrealizeObject(hBrush);

#if defined( WIN32 )
           SetBrushOrgEx((HDC)wParam, 0, 0, &point);
#else
           SetBrushOrg((HDC)wParam, 0, 0);
#endif

           FillRect((HDC)wParam, &Rect, hBrush);

           return TRUE;
        }


        case WM_PAINT:
            hMF=(HGLOBAL)GetWindowLong(hWnd, IBWW_HIMAGE);

            //BeginPaint and EndPaint clear us even if hMF is NULL.
            hDC=BeginPaint(hWnd, &ps);

            if (NULL!=hMF)
                {
                BOOL            fLabel;

                //Now we get to paint the metafile, centered in our rect.
                GetClientRect(hWnd, &rc);

                /*
                 * If we're doing icon only, then place the metafile
                 * at the center of our box minus half the icon width.
                 * Top is top.
                 */

                fLabel=GetWindowWord(hWnd, IBWW_FLABEL);


                //Go draw where we decided to place it.
                OleUIMetafilePictIconDraw(hDC, &rc, hMF, !fLabel);
                }

            EndPaint(hWnd, &ps);
            break;


        case IBXM_IMAGESET:
            /*
             * wParam contains the new handle.
             * lParam is a flag to delete the old or not.
             */
            hMF=(HGLOBAL)SetWindowLong(hWnd, IBWW_HIMAGE, wParam);
            InvalidateRect(hWnd, NULL, TRUE);
            UpdateWindow(hWnd);

            //Delete the old handle if requested
            if (0L!=lParam)
                {
                OleUIMetafilePictIconFree(hMF);
                hMF=NULL;
                }

            return (LONG)(UINT)hMF;


        case IBXM_IMAGEGET:
            //Return the current index.
            hMF=(HGLOBAL)GetWindowLong(hWnd, IBWW_HIMAGE);
            return (LONG)(UINT)hMF;


        case IBXM_IMAGEFREE:
            //Free up whatever we're holding.
            hMF=(HGLOBAL)GetWindowLong(hWnd, IBWW_HIMAGE);
            OleUIMetafilePictIconFree(hMF);
            return 1L;


        case IBXM_LABELENABLE:
            //wParam has the new flag, returns the previous flag.
            return (LONG)SetWindowWord(hWnd, IBWW_FLABEL, (WORD)wParam);


        default:
            return DefWindowProc(hWnd, iMsg, wParam, lParam);
        }

    return 0L;
    }