page.cpp

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/*
 * PAGE.CPP
 * Patron Chapter 12
 *
 * Implementation of parts of the CPage class; those member
 * functions dealing with mouse events are in PAGEMOUS.CPP.
 *
 * Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved
 *
 * Kraig Brockschmidt, Microsoft
 * Internet  :  [e-mail]
 * Compuserve:  >INTERNET:[e-mail]
 */


#include "patron.h"


/*
 * CPage::CPage
 * CPage::~CPage
 *
 * Constructor Parameters:
 *  dwID            DWORD identifier for this page.
 *  hWnd            HWND of the pages window (for repaints, etc).
 *  pPG             PCPages to the Pages window.
 */

//CHAPTER12MOD
CPage::CPage(DWORD dwID, HWND hWnd, PCPages pPG)
//End CHAPTER12MOD
    {
    m_dwID     =dwID;
    m_pIStorage=NULL;

    //CHAPTER12MOD
    m_cOpens=0;
    m_hWnd=hWnd;
    m_pPG=pPG;

    m_dwIDNext      =0;
    m_cTenants      =0;
    m_hWndTenantList=NULL;
    m_iTenantCur    =NOVALUE;   //Tenants are zero indexed.
    m_pTenantCur    =NULL;

    m_uHTCode=HTNOWHERE;
    m_uSizingFlags=0;
    m_fTracking=FALSE;
    m_hDC=NULL;

    m_fSizePending=FALSE;
    m_fTimer=FALSE;

    //These will be read from WIN.INI in Chapter 13.
    m_cxyDist=2;
    m_cDelay=200;
    //End CHAPTER12MOD

    return;
    }


CPage::~CPage(void)
    {
    //CHAPTER12MOD
    if (m_fTimer)
        KillTimer(m_hWnd, IDTIMER_DEBOUNCE);
    //End CHAPTER12MOD

    m_hWnd=NULL;
    Close(FALSE);
    return;
    }



/*
 * CPage::GetID
 *
 * Return Value:
 *  DWORD           dwID field in this page.
 */

DWORD CPage::GetID(void)
    {
    return m_dwID;
    }





/*
 * CPage::Open
 *
 * Purpose:
 *  Retrieves the IStorage associated with this page.  The IStorage
 *  is owned by the page and thus the page always holds a reference
 *  count.  The caller should call Close or delete this page to
 *  match this open.
 *
 *  This function may be called multiple times resulting in
 *  additional reference counts on the storage each of which must be
 *  matched with a call to Close.  The last Close can be done
 *  through delete.
 *
 * Parameters:
 *  pIStorage       LPSTORAGE in which this page lives.
 *
 * Return Value:
 *  BOOL            TRUE if opening succeeds, FALSE otherwise.
 */

BOOL CPage::Open(LPSTORAGE pIStorage)
    {
    //CHAPTER12MOD
    HRESULT         hr=NOERROR;
    LPSTREAM        pIStream;
    DWORD           dwMode;
    OLECHAR         szTemp[32];
    BOOL            fNew;
    BOOL            fCreated=FALSE;
    TENANTLIST      tl;
    PTENANTINFO     pti;
    ULONG           cb;
    LPMALLOC        pIMalloc;
    UINT            i;
    PCTenant        pTenant;

    fNew=(NULL==m_pIStorage);

    if (!fNew)
        {
        m_cOpens++;
        m_pIStorage->AddRef();
        return TRUE;
        }

    if (NULL==pIStorage)
        return FALSE;

    /*
     * Attempt to open the storage under this ID.  If none,
     * create one.  In either case, the IStorage is either
     * saved in pPage or released.
     */

    GetStorageName(szTemp);
    dwMode=STGM_TRANSACTED | STGM_READWRITE | STGM_SHARE_EXCLUSIVE;

    hr=pIStorage->OpenStorage(szTemp, NULL, dwMode, NULL, 0
        , &m_pIStorage);

    if (FAILED(hr))
        {
        hr=pIStorage->CreateStorage(szTemp, dwMode, 0, 0
            , &m_pIStorage);
        fCreated=TRUE;
        }

    if (FAILED(hr))
        return FALSE;

    m_cOpens++;

    if (NULL==m_hWndTenantList)
        {
        /*
         * The first time we open this page, create the hidden
         * listbox we'll use to track tenants.  We give it the
         * owner-draw style so we can just store pointers in it.
         */
        m_hWndTenantList=CreateWindow(TEXT("listbox")
            , TEXT("Tenant List"), WS_POPUP | LBS_OWNERDRAWFIXED
            , 0, 0, 100, 100, HWND_DESKTOP, NULL
            , m_pPG->m_hInst, NULL);

        if (NULL==m_hWndTenantList)
            return FALSE;
        }


    //If this is brand-new, we're done.
    if (fCreated)
        return TRUE;


    /*
     * Now open the stream we saved in Close and load all the
     * tenants listed in there.  If there are none, then we don't
     * have to load squat.
     */

    hr=m_pIStorage->OpenStream(SZSTREAMTENANTLIST, NULL, STGM_DIRECT
        | STGM_READ | STGM_SHARE_EXCLUSIVE, 0, &pIStream);

    if (FAILED(hr))
        return FALSE;

    if (SUCCEEDED(CoGetMalloc(MEMCTX_TASK, &pIMalloc)))
        {
        pIStream->Read(&tl, sizeof(tl), NULL);
        m_cTenants=tl.cTenants;
        m_dwIDNext=tl.dwIDNext;
        m_iTenantCur=0;

        cb=tl.cTenants*sizeof(TENANTINFO);

        if (0!=cb)
            {
            pti=(PTENANTINFO)pIMalloc->Alloc(cb);

            if (NULL!=pti)
                {
                pIStream->Read(pti, cb, NULL);

                for (i=0; i < m_cTenants; i++)
                    {
                    if (TenantAdd(NOVALUE, (pti+i)->dwID, &pTenant))
                        pTenant->Load(m_pIStorage, (pti+i));
                    }

                pIMalloc->Free(pti);
                }
            }

        pIMalloc->Release();
        }

    pIStream->Release();

    //Get and select the first tenant
    if (TenantGet(0, &m_pTenantCur, FALSE))
        m_pTenantCur->Select(TRUE);

    return TRUE;
    //End CHAPTER12MOD
    }





/*
 * CPage::Close
 *
 * Purpose:
 *  Possibly commits the storage, then releases it reversing the
 *  reference count from Open.
 *
 * Parameters:
 *  fCommit         BOOL indicating if we're to commit.
 *
 * Return Value:
 *  None
 */

void CPage::Close(BOOL fCommit)
    {
    if (NULL==m_pIStorage)
        return;

    if (fCommit)
        Update();

    //CHAPTER12MOD
    m_pIStorage->Release();

    //If this was the last close, make all tenants loaded->passive
    if (0==--m_cOpens)
        {
        UINT        i;
        PCTenant    pTenant;

        m_pIStorage=NULL;

        for (i=0; i < m_cTenants; i++)
            {
            if (TenantGet(i, &pTenant, FALSE))
                {
                if (NULL!=m_hWnd)
                    {
                    //Open may select again, so this repaints.
                    pTenant->Select(FALSE);
                    }

                pTenant->Close(FALSE);
                delete pTenant;
                }
            }

        DestroyWindow(m_hWndTenantList);
        m_hWndTenantList=NULL;
        }
    //End CHAPTER12MOD

    return;
    }




/*
 * CPage::Update
 *
 * Purpose:
 *  Forces a common on the page if it's open.
 *
 * Parameters:
 *  None
 *
 * Return Value:
 *  BOOL            TRUE if there are any open objects on this page,
 *                  that is, we should remain open.
 */

BOOL CPage::Update(void)
    {
    //CHAPTER12MOD
    BOOL            fOpen=FALSE;
    UINT            i;
    PCTenant        pTenant;
    HRESULT         hr;
    LPSTREAM        pIStream;
    TENANTLIST      tl;
    PTENANTINFO     pti;
    ULONG           cb;
    LPMALLOC        pIMalloc;

    //Walk the list of objects and update them all as well.
    for (i=0; i < m_cTenants; i++)
        {
        if (TenantGet(i, &pTenant, FALSE))
            fOpen |= pTenant->Update();
        }

    //Now write our own stream containing the tenant list.
    hr=m_pIStorage->CreateStream(SZSTREAMTENANTLIST, STGM_CREATE
        | STGM_WRITE| STGM_DIRECT | STGM_SHARE_EXCLUSIVE, 0, 0
        , &pIStream);

    if (FAILED(hr))
        return fOpen;

    if (SUCCEEDED(CoGetMalloc(MEMCTX_TASK, &pIMalloc)))
        {
        tl.cTenants=m_cTenants;
        tl.dwIDNext=m_dwIDNext;

        pIStream->Write(&tl, sizeof(TENANTLIST), &cb);

        cb=m_cTenants*sizeof(TENANTINFO);
        pti=(PTENANTINFO)pIMalloc->Alloc(cb);

        if (NULL!=pti)
            {
            for (i=0; i < m_cTenants; i++)
                {
                TenantGet(i, &pTenant, FALSE);
                pTenant->GetInfo((pti+i));
                }

            pIStream->Write(pti, cb, &cb);
            pIMalloc->Free(pti);
            }

        pIMalloc->Release();
        }

    pIStream->Release();

    //Now commit the whole mess and we're done
    if (NULL!=m_pIStorage)
        m_pIStorage->Commit(STGC_DEFAULT);

    return fOpen;
    //End CHAPTER12MOD
    }





/*
 * CPage::Destroy
 *
 * Purpose:
 *  Removes this page from the given storage.  The caller should
 *  eventually delete this Page object to free the storage.
 *
 * Parameters:
 *  pIStorage       LPSTORAGE contianing this page on which to call
 *                  DestroyElement
 *
 * Return Value:
 *  None
 */

void CPage::Destroy(LPSTORAGE pIStorage)
    {
    if (NULL!=pIStorage)
        {
        OLECHAR szTemp[32];

        Close(FALSE);
        GetStorageName(szTemp);
        pIStorage->DestroyElement(szTemp);
        }

    return;
    }




/*
 * CPage::GetStorageName
 *
 * Parameters:
 *  pszName         LPOLESTR to a buffer in which to store the
 *                  storage name for this page.
 *
 * Return Value:
 *  UINT            Number of characters stored.
 */

UINT CPage::GetStorageName(LPOLESTR pszName)
    {
   #ifdef WIN32ANSI
    char        szTemp[32];
    UINT        cch;

    cch=wsprintf(szTemp, "Page %lu", m_dwID);
    MultiByteToWideChar(CP_ACP, 0, szTemp, -1, pszName, 32);
    return cch;
   #else
    return wsprintf(pszName, TEXT("Page %lu"), m_dwID);
   #endif
    }




//CHAPTER12MOD

/*
 * CPage::Draw
 *
 * Purpose:
 *  Draws the objects on this page to the given hDC.
 *
 * Parameters:
 *  hDC             HDC on which to draw.
 *  xOff, yOff      int offsets for the page.
 *  fNoColor        BOOL indicating black & white screen rendering.
 *  fPrinter        BOOL indicating hDC is on the printer.
 *
 * Return Value:
 *  None
 */

void CPage::Draw(HDC hDC, int xOff, int yOff, BOOL fNoColor
    , BOOL fPrinter)
    {
    int                 i;
    PCTenant            pTenant;
    HDC                 hIC=NULL;
    PCOMBINEDEVICE      pcd=NULL;
    DVTARGETDEVICE     *ptd=NULL;

    /*
     * If printing, tell the tenant to forget the borders. Otherwise
     * we leave xOff and yOff the same to account for scrolling.
     */
    if (fPrinter)
        {
        xOff=LOMETRIC_BORDER+m_pPG->m_xMarginLeft;
        yOff=-LOMETRIC_BORDER-m_pPG->m_yMarginTop;

        /*
         * Get device information.  If this fails, ptd is