SuperHack/SuperHack CD.bin/CODING/CPP/METAKIT.ZIP/EXAMPLES/CATFISH/CATFISH.CPP

C/C++ Source or Header | 1996-12-09 | 38.6 KB | 1,291 lines

//  catfish.cpp  -  main application sample code
//
//  This is a part of the MetaKit library.
//  Copyright (c) 1996 Meta Four Software.
//  All rights reserved.
/////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "catfish.h"
#include "setupdlg.h"

    #include <dos.h>    // _dos_findfirst in GetCatalogDate

#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif

#pragma warning(disable: 4702) // MSVC 1.52 gets confused: unreachable code

/////////////////////////////////////////////////////////////////////////////
// MSDN Q100770: Using Accelerator Keys When Modal Dialog Box Main Window

    HWND    ghDlg;          // Handle to main dialog box
    HACCEL  ghAccelTable;   // Handle to accelerator table

    CTheApp ThisApp;

/////////////////////////////////////////////////////////////////////////////
// Use a simple version of localized date, time, and number formating.

    static CString  sShortDate  = "MM/dd/yy";   // "d.M.yyyy", etc
    static bool     iTime       = false;        // true if 24h format
    static bool     iTLZero     = true;         // true if hour has 2 digits
    static char     sThousand   = ',';          // thousands separator
    static char     sTime       = ':';          // time separator

    static void SetInternationalSettings()
    {
        iTime = GetProfileInt("intl", "iTime", 0) != 0;
        iTLZero = GetProfileInt("intl", "iTLZero", 1) != 0;

        char buf [30];

        if (GetProfileString("intl", "sShortDate", "MM/dd/yy", buf, sizeof buf))
            sShortDate = buf;

        if (GetProfileString("intl", "sThousand", ",", buf, sizeof buf))
            sThousand = *buf;

        if (GetProfileString("intl", "sTime", ":", buf, sizeof buf))
            sTime = *buf;
    }

/////////////////////////////////////////////////////////////////////////////
// Convert a number to comma-separated format, grouped in units of three.
// Optionally prefix with spaces (assuming two spaces is width of one digit).
// Finally, the zero value can be changed to a '-' upon request.
//
// Note:    In many places, the code is simplified by the assumption that
//          every digit has exactly the same width as two space characters.
//          This works for the selected font (MS Sans Serif, font size 8).
//          It allows us to present a nice columnar interface without having
//          to figure out each of the string position in pixels. There are
//          several more assumptions like this (e.g. "k   " is like "Mb").

    static CString CommaNum(DWORD num, int groups =0, BOOL zero =TRUE)
    {
        CString s;
        s.Format("%lu", num);

        int g = 0;
        int n = s.GetLength();
        while (n > 3)
        {
            n -= 3;
            s = s.Left(n) + sThousand + s.Mid(n);
            ++g;
        }

        if (--groups >= 0)
        {
            int w = ((3 - n) % 3) * 2;
            if (g < groups)
                w += 7 * (groups - g);

            s = CString (' ', w) + s;
        }

        if (!zero && (s == "0" || s.Right(2) == " 0"))
            s = s.Left(s.GetLength() - 1) + " -";

        return s;
    }

/////////////////////////////////////////////////////////////////////////////
// Convert a DOS date and TIME words to short format strings.
// Lets be nice to a lot of people and adopt their local conventions.

    static CString ShortDate(WORD date)
    {
        int w = 0;

        char buf [10];
        char* q = buf;

            // decode the short date, deal with 1- and 2-digit fields
        const char* p = sShortDate;
        while (*p)
        {
            int i;

            switch (*p++)
            {
                default:    *q++ = *(p-1);
                            continue;

                case 'd':   i = date & 0x1F;
                            break;

                case 'M':   i = (date >> 5) & 0x0F;
                            break;

                case 'y':   i = ((date >> 9) + 80) % 100;
                            break; // 4-digit years are treated as 2-digit

            }

            if (i < 10 && *p != *(p-1))
                ++w;
            else
                *q++ = (char) (i / 10 + '0');

            *q++ = (char) (i % 10 + '0');

            while (*p == *(p-1))
                ++p;
        }

            // centering is easy, since one digit is as wide as two spaces
        CString t (' ', 2 * w);
            // alignment depends on whether the year is first or last
        if (sShortDate[0] == 'y')
            return CString (buf, q - buf) + t;

        return t + CString (buf, q - buf);
    }

    static CString ShortTime(WORD time)
    {
        int h = time >> 11;
        int m = (time >> 5) & 0x3F;

        if (!iTime)
            h = (h + 11) % 12 + 1; // dec, then inc, so 0 becomes 12

        CString s;
        s.Format("%02d%c%02d", h, sTime, m);

        if (!iTime)
            s += h < 12 ? 'a' : 'p';

        if (!iTLZero && s[0] == '0')
            s = "  " + s.Mid(1); // replace leading zero with two spaces

        return s;
    }

/////////////////////////////////////////////////////////////////////////////
// Make a string fit in the specified number of pixels on given device.
// Characters at the end are replaced by an ellipsis to make the string fit.
// There is some trickery in here to optimize this very common calculation.

    static BOOL FitString(CDC* dc, CString& text, int width)
    {
        CSize sz = dc->GetTextExtent(text, text.GetLength());
        if (sz.cx <= width)
            return TRUE;    // make the most common case fast

            // Assumption: "...xyz" is just as wide as "xyz..."
        CString s = "..." + text;

        int n = s.GetLength();
        while (--n > 3)
        {
            sz = dc->GetTextExtent(text, n);
            if (sz.cx <= width)
                break;
        }

        text = text.Left(n - 3) + "...";
        return FALSE;
    }

/////////////////////////////////////////////////////////////////////////////
// Disables redraw and clears listbox, will reset normal state in destructor

    class ListBoxFreezer
    {
    public:
        ListBoxFreezer (CListBox& lb)
            : list (lb)
        {
            list.SetRedraw(FALSE);
            list.ResetContent();
        }

        ~ListBoxFreezer ()
        {
            list.SetRedraw(TRUE);
            list.Invalidate();
        }

    private:
        CListBox& list;
    };

/////////////////////////////////////////////////////////////////////////////
// Return file date in display format, or an empty string if file not present

CString GetCatalogDate(CString& catName)
{
    CString s = catName;
    s += FILE_TYPE;

    _find_t fbuf;
    if (_dos_findfirst(s, _A_NORMAL, &fbuf) != 0)
        return "";

        // pick up the name as it is stored on disk (properly capitalized)
    s = fbuf.name;
    ASSERT(s.Right(4).CompareNoCase(FILE_TYPE) == 0);
    catName = s.Left(s.GetLength() - 4);

    return ShortDate((WORD) fbuf.wr_date) + "  "
            + ShortTime((WORD) fbuf.wr_time);
}

/////////////////////////////////////////////////////////////////////////////
// The one and only application object

CTheApp::CTheApp ()
    : CWinApp ("CatFish")
{
}

BOOL CTheApp::InitInstance()
{
    SetDialogBkColor();
    SetInternationalSettings();

    ghAccelTable = LoadAccelerators(AfxGetInstanceHandle(),
                                    MAKEINTRESOURCE(IDD_MAIN_DIALOG));

        // the following is required to let a dialog box have an icon
    static WNDCLASS wndclass;
    if (!wndclass.lpfnWndProc)
    {
        wndclass.lpfnWndProc    = DefDlgProc;
        wndclass.cbWndExtra     = DLGWINDOWEXTRA ;
        wndclass.hInstance      = m_hInstance;
        wndclass.hIcon          = LoadIcon(AFX_IDI_STD_FRAME);
        wndclass.lpszClassName  = "CATFISHCLASS";

        RegisterClass(&wndclass);
    }

        // enter a modal loop right now
    CMainDlgWindow mainDlg;
    m_pMainWnd = &mainDlg;
    mainDlg.DoModal();

        // and then return false to skip the main application run loop
    return FALSE;
}

BOOL CTheApp::ProcessMessageFilter(int code, LPMSG lpMsg)
{
    if (code < 0)
        CWinApp::ProcessMessageFilter(code, lpMsg);

    if (ghDlg && ghAccelTable)
    {
        if (::TranslateAccelerator(ghDlg, ghAccelTable, lpMsg))
            return(TRUE);
    }

    return CWinApp::ProcessMessageFilter(code, lpMsg);
}

/////////////////////////////////////////////////////////////////////////////

BEGIN_MESSAGE_MAP(CMainDlgWindow, CDialog)
    //{{AFX_MSG_MAP(CMainDlgWindow)
    ON_WM_CLOSE()
    ON_WM_DRAWITEM()
    ON_LBN_SELCHANGE(IDC_CAT_LIST, OnSelchangeCatList)
    ON_LBN_SELCHANGE(IDC_TREE_LIST, OnSelchangeTreeList)
    ON_LBN_DBLCLK(IDC_TREE_LIST, OnDblclkTreeList)
    ON_LBN_SELCHANGE(IDC_FILE_LIST, OnSelchangeFileList)
    ON_BN_CLICKED(IDC_FIND_BTN, OnFindBtn)
    ON_BN_CLICKED(IDC_SETUP_BTN, OnSetupBtn)
    ON_LBN_DBLCLK(IDC_FILE_LIST, OnDblclkFileList)
    ON_COMMAND(ID_FIND_NEXT, OnFindNext)
    ON_COMMAND(ID_FIND_PREV, OnFindPrev)
    ON_COMMAND(ID_SORT_BY_NAME, OnSortByName)
    ON_COMMAND(ID_SORT_BY_SIZE, OnSortBySize)
    ON_COMMAND(ID_SORT_BY_DATE, OnSortByDate)
    ON_COMMAND(ID_SORT_REVERSE, OnSortReverse)
    ON_WM_DESTROY()
    ON_WM_LBUTTONDOWN()
    ON_WM_CHAR()
    ON_COMMAND(ID_FIND_CMD, OnFindBtn)
    ON_COMMAND(ID_FILE_SETUP, OnSetupBtn)
    ON_LBN_DBLCLK(IDC_CAT_LIST, OnSetupBtn)
    ON_COMMAND(ID_APP_ABOUT, OnAppAbout)
    //}}AFX_MSG_MAP
    ON_COMMAND(ID_HELP, OnHelp)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////

CMainDlgWindow::CMainDlgWindow ()
    : CDialog (IDD_MAIN_DIALOG),
      m_storage (0), m_fileDir (-1), m_treeDir (-1), m_dc (0),
      m_sortProp (&pName), m_sortReverse (false)
{
    //{{AFX_DATA_INIT(CMainDlgWindow)
    //}}AFX_DATA_INIT
}

CMainDlgWindow::~CMainDlgWindow ()
{
    delete m_storage;
}

void CMainDlgWindow::DoDataExchange(CDataExchange* pDX)
{
    CDialog::DoDataExchange(pDX);
    //{{AFX_DATA_MAP(CMainDlgWindow)
    DDX_Control(pDX, IDC_FIND_BTN, m_findBtn);
    DDX_Control(pDX, IDC_PATH_FRAME, m_pathFrame);
    DDX_Control(pDX, IDC_TREE_LIST, m_treeList);
    DDX_Control(pDX, IDC_FILE_LIST, m_fileList);
    DDX_Control(pDX, IDC_CAT_LIST, m_catList);
    DDX_Control(pDX, IDC_MSG_TEXT, m_msgText);
    DDX_Control(pDX, IDC_INFO_TEXT, m_infoText);
    DDX_Control(pDX, IDC_TREE_PATH, m_treePath);
    //}}AFX_DATA_MAP
}

void CMainDlgWindow::OnCancel()
{
    ::MessageBeep(0);                  // don't go away on ESC key
}

void CMainDlgWindow::OnClose()
{
    EndDialog(IDOK);
}

void CMainDlgWindow::OnDestroy()
{
    CDialog::OnDestroy();

    SetCatalog("");
}

BOOL CMainDlgWindow::OnInitDialog()
{
    CDialog::OnInitDialog();

    ghDlg = m_hWnd;

        // create a small font for several of the dialog box items
    LOGFONT lf;
    memset(&lf, 0, sizeof(LOGFONT));
    lf.lfHeight = -8;
    strcpy(lf.lfFaceName, "MS Sans Serif");
    m_font.CreateFontIndirect(&lf);

    m_msgText.SetFont(&m_font, FALSE);
    m_infoText.SetFont(&m_font, FALSE);
    m_catList.SetFont(&m_font, FALSE);
    m_treeList.SetFont(&m_font, FALSE);
    m_fileList.SetFont(&m_font, FALSE);

        // determine the character height and set owner-draw lists accordingly
    {
        CClientDC dc (this);
        CFont* oldFont = dc.SelectObject(&m_font);

        TEXTMETRIC tm;
        VERIFY(dc.GetTextMetrics(&tm));

        dc.SelectObject(oldFont);

        m_catList.SetItemHeight(0, tm.tmHeight);
        m_treeList.SetItemHeight(0, tm.tmHeight);
        m_fileList.SetItemHeight(0, tm.tmHeight);
    }

        // fill the list of catalogs
    m_catList.Dir(0, "*" FILE_TYPE);

        // default file sort order is by filename
    SortFileList(pName);

        // show contents now, before potential slow catalog loading starts
    ShowWindow(ThisApp.m_nCmdShow);
    UpdateWindow();

    m_catList.SetCurSel(0);
    OnSelchangeCatList();

    m_infoText.SetWindowText("http://purl.net/meta4/metakit");

    if (m_catList.GetCount() == 0)
        OnHelp();

    return TRUE;    // return TRUE  unless you set the focus to a control
}

    // notification handler for owner-draw listboxes
void CMainDlgWindow::OnDrawItem(int nIDCtl, LPDRAWITEMSTRUCT lpDrawItemStruct)
{
    int n = (int) lpDrawItemStruct->itemID;
    if (n == -1)
       return;

    m_item = lpDrawItemStruct;
    m_dc = CDC::FromHandle(m_item->hDC);

    if (m_item->itemAction == ODA_FOCUS)
    {
        m_dc->DrawFocusRect(&m_item->rcItem);
        return;
    }

    if (m_item->itemState & ODS_SELECTED)
    {
        m_dc->SetBkColor(GetSysColor(COLOR_HIGHLIGHT));
        m_dc->SetTextColor(GetSysColor(COLOR_HIGHLIGHTTEXT));
    }
    else
    {
        m_dc->SetBkColor(GetSysColor(COLOR_WINDOW));
        m_dc->SetTextColor(GetSysColor(COLOR_WINDOWTEXT));
    }

    switch (nIDCtl)
    {
        case IDC_CAT_LIST:      OnDrawCatItem(n); break;
        case IDC_TREE_LIST:     OnDrawDirItem(n); break;
        case IDC_FILE_LIST:     OnDrawFileItem(n); break;
    }

    if ((m_item->itemState & ODS_FOCUS) && m_item->itemAction != ODA_SELECT)
        m_dc->DrawFocusRect(&m_item->rcItem);
}

    // common code to draw a text string in a listbox item
void CMainDlgWindow::DrawItemText(const CString& text, int off)
{
    RECT& rect = m_item->rcItem;

    m_dc->ExtTextOut(rect.left + off + 2, rect.top,
                        off ? 0 : ETO_OPAQUE, &rect,
                        text, text.GetLength(), 0);
}

    // draw one item in the catalog listbox
void CMainDlgWindow::OnDrawCatItem(int n)
{
    CString s;
    m_catList.GetText(n, s);

    ASSERT(s.Right(4).CompareNoCase(FILE_TYPE) == 0);
    s = s.Left(s.GetLength() - 4);

    CString date = GetCatalogDate(s);

    FitString(m_dc, s, 72);
    DrawItemText(s);

    DrawItemText(date, 72);
}

    // draw one item in the tree listbox
void CMainDlgWindow::OnDrawDirItem(int n)
{
    int dir = (int) m_treeList.GetItemData(n);
    BOOL up = n == 0 || pParent (m_currCat[dir]) != m_treeDir;

    if (up && !(m_item->itemState & ODS_SELECTED))
        m_dc->SetTextColor(GetSysColor(COLOR_GRAYTEXT));

    CString s = pName (m_currCat[dir]);
    if (dir == 0)
        s = "(root)";

    if (!up)
        s = (m_dirCounts[dir] ? "+ " : "   ") + s;

    FitString(m_dc, s, 78);
    DrawItemText(s);

    DWORD t = m_kiloTotals[dir];
    if (t <= 999999)
        s = CommaNum(t, 2) + " k   ";
    else
        s = CommaNum((t + 999) / 1000, 2) + " Mb";

    s += CommaNum(m_dirCounts[dir], 2, FALSE).Mid(2) + "  "
       + CommaNum(m_fileCounts[dir], 2, FALSE) + "    "
       + ShortDate(m_lastDates[dir]);

    DrawItemText(s, 78);
}

    // draw one item in the file listbox
void CMainDlgWindow::OnDrawFileItem(int n)
{
    c4_RowRef file = m_fileSort[n];

    CString s = pName (file);
    FitString(m_dc, s, 85);
    DrawItemText(s);

    s = CommaNum(pSize (file), 3) + "    " + ShortDate((WORD) pDate (file));
    DrawItemText(s, 85);
}

    // pressing F1 leads to an brief help screen
void CMainDlgWindow::OnHelp()
{
    CDialog dlg (IDD_WELCOME_DLG);
    dlg.DoModal();
}

    // there is of course also an about box
void CMainDlgWindow::OnAppAbout()
{
    CDialog dlg (IDD_ABOUTBOX);
    dlg.DoModal();
}

    // find file entries
void CMainDlgWindow::OnFindBtn()
{
    int n = m_catList.GetCurSel();
    ASSERT(n != LB_ERR);

    CString s;
    m_catList.GetText(n, s);

    ASSERT(s.Right(4).CompareNoCase(FILE_TYPE) == 0);
    s = s.Left(s.GetLength() - 4);

    s.MakeUpper();

    if (m_findDlg.Execute(s))
        OnFindNext();
}

    // setup catalogs
void CMainDlgWindow::OnSetupBtn()
{
    CSetupDialog dlg;

    int n = m_catList.GetCurSel();
    if (n != LB_ERR)
    {
        CString s;
        m_catList.GetText(n, s);

        ASSERT(s.Right(4).CompareNoCase(FILE_TYPE) == 0);
        dlg.m_name = s.Left(s.GetLength() - 4);
    }

    SetCatalog(""); // make sure no catalog is in use during setup

    dlg.DoModal();

    {
        ListBoxFreezer frozen (m_catList);

        m_catList.Dir(0, "*" FILE_TYPE);

            // attempt to maintain the current selection
        if (m_catList.SelectString(-1, dlg.m_name) == LB_ERR)
            m_catList.SetCurSel(0);
    }

    OnSelchangeCatList();
}

    // adjust the title to show which catalog is selected
void CMainDlgWindow::ConstructTitle()
{
    CString s = m_currCatName;
    ASSERT(s.Right(4).CompareNoCase(FILE_TYPE) == 0);
    s = s.Left(s.GetLength() - 4);

    GetCatalogDate(s); // for side-effect: proper file name capitalization

    CString root = pName (m_currCat[0]);
    if (!root.IsEmpty())
        s += " - " + root;

    s = "CatFish - " + s;

    CString title;
    GetWindowText(title);

    if (title != s)
        SetWindowText(s);
}

    // select a catalog and update the dialog contents
void CMainDlgWindow::SetCatalog(const char* catName)
{
    if (m_currCatName == catName)
        return; // don't bother, the catalog is currently loaded

    SetTreeDir(-1);

        // An important side effect is that m_fileView is cleared before the
        // storage class is destroyed. Otherwise, the entire view would be
        // loaded into memory since the underlying file is about to go away.
    SetFileDir(-1);

    m_currCat = c4_View (); // see comment about m_fileView
    delete m_storage;
    m_storage = 0;

    m_dirCounts.RemoveAll();
    m_fileCounts.RemoveAll();
    m_lastDates.RemoveAll();
    m_kiloTotals.RemoveAll();

    m_currCatName = catName;
    if (m_currCatName.IsEmpty())
        return;

        // loading and calculations may take some time
    HCURSOR oldCursor = SetCursor(LoadCursor(0, IDC_WAIT));

    m_storage = DEBUG_NEW c4_Storage (m_currCatName, false);
    m_currCat = m_storage->View("dirs");

    ConstructTitle();

    int n = m_currCat.GetSize();
    m_dirCounts.InsertAt(0, 0, n);
    m_fileCounts.InsertAt(0, 0, n);
    m_lastDates.InsertAt(0, 0, n);
    m_kiloTotals.InsertAt(0, 0, n);

        // this loop calculates all cumulative totals and dates,
        // mathematicians call this the "transitive closure" ...
    while (--n >= 0)
    {
        c4_RowRef dir = m_currCat[n];

        int date = 0;
        DWORD total = 0;

        c4_View files = pFiles (dir);

        for (int i = 0; i < files.GetSize(); ++i)
        {
            c4_RowRef file = files[i];

            total += pSize (file);
            if (date < pDate (file))
                date = (int) pDate (file);
        }

        ASSERT(i == files.GetSize());
        m_fileCounts[n] += (WORD) i;
        m_kiloTotals[n] += (total + 1023) / 1024;

        if (m_lastDates[n] < (WORD) date)
            m_lastDates[n] = (WORD) date;

        int parDir = pParent (dir);
        if (parDir != n)
        {
            m_dirCounts[parDir] += m_dirCounts[n] + 1;
            m_fileCounts[parDir] += m_fileCounts[n];
            m_kiloTotals[parDir] += m_kiloTotals[n];

            if (m_lastDates[parDir] < m_lastDates[n])
                m_lastDates[parDir] = m_lastDates[n];
        }
    }

    SetCursor(oldCursor);

    if (m_currCat.GetSize() > 0)
        SetTreeDir(0);
}

    // select a directory in the tree and update the dialog contents
void CMainDlgWindow::SetTreeDir(int dirNum)
{
    if (dirNum != m_treeDir)
    {
        m_treeDir = dirNum;

        ListBoxFreezer frozen (m_treeList);

        if (dirNum >= 0)
        {
                // select the appropriate subdirectories and sort them by name
            c4_View selsort = m_currCat.Select(pParent [dirNum]).SortOn(pName);

            for (int j = 0; j < selsort.GetSize(); ++j)
            {
                    // map each entry back to the m_currCat view
                int ix = m_currCat.GetIndexOf(selsort[j]);
                ASSERT(ix >= 0);

                    // don't add the root entry, it doesn't sort correctly
                if (ix > 0)
                {
                    int k = m_treeList.AddString("");
                    m_treeList.SetItemData(k, ix);
                }
            }

                // insert the parent directories in reverse order in front
            for (;;)
            {
                m_treeList.InsertString(0, "");
                m_treeList.SetItemData(0, dirNum);

                if (dirNum == m_treeDir)
                    m_treeList.SetCurSel(0);

                if (dirNum <= 0)
                    break;

                dirNum = (int) pParent (m_currCat[dirNum]);
            }

                // make sure the focus item is the same as the selection
                // InsertString moves the selection but not the focus...
            m_treeList.SetCurSel(m_treeList.GetCurSel());
        }
    }

    SetFileDir(m_treeDir);
}

    // select a list of files and update the dialog contents
void CMainDlgWindow::SetFileDir(int dirNum)
{
    if (dirNum != m_fileDir)
    {
        m_fileDir = dirNum;

        ListBoxFreezer frozen (m_fileList);

        if (dirNum >= 0)
        {
            m_fileView = pFiles (m_currCat[dirNum]);

            CString root = fFullPath(m_currCat, 0);
            CString path = fFullPath(m_currCat, dirNum);

                // remove common root prefix
            path = path.Mid(root.GetLength());
            if (path.IsEmpty())
                path = "(root)";

            m_treePath.SetWindowText(path);

            for (int i = 0; i < m_fileView.GetSize(); ++i)
                m_fileList.AddString("");
        }
        else
        {
            m_fileSort = c4_View ();
            m_fileView = c4_View ();
            m_treePath.SetWindowText("");
        }

            // this sets up the appropriate m_fileSort view
        SortFileList(*m_sortProp);
    }

        // always reset the file list selection
    m_fileList.SetCurSel(-1);

    OnSelchangeFileList();
}

    // the catalog selection changed
void CMainDlgWindow::OnSelchangeCatList()
{
    CString s;

    int n = m_catList.GetCurSel();
    if (n != LB_ERR)
        m_catList.GetText(n, s);

    SetCatalog(s);
}

    // the directory selection changed
void CMainDlgWindow::OnSelchangeTreeList()
{
    int n = m_treeList.GetCurSel();

    m_findBtn.EnableWindow(n >= 0);

    if (n >= 0)
        n = (int) m_treeList.GetItemData(n);

    SetFileDir(n);
}

    // descend into an entry in the directory tree
void CMainDlgWindow::OnDblclkTreeList()
{
    int n = m_treeList.GetCurSel();
    if (n >= 0)
    {
        n = (int) m_treeList.GetItemData(n);

            // don't allow descending into a dir with no subdirs
        if (m_dirCounts[n] == 0)
        {
            MessageBeep(0);
            return;
        }
    }

    SetTreeDir(n);
}

    // the file selection changed
void CMainDlgWindow::OnSelchangeFileList()
{
    CString s;

    int n = m_fileList.GetCurSel();
    if (n >= 0)
    {
        c4_RowRef file = m_fileSort[n];
        s = pName (file);
    }
    else if (m_fileDir >= 0)
        s.Format("%d files", m_fileSort.GetSize());

    m_infoText.SetWindowText(s);
}

void CMainDlgWindow::OnDblclkFileList()
{
    int n = m_fileList.GetCurSel();
    if (n >= 0)
    {
        c4_RowRef file = m_fileSort[n];
        CString s = pName (file);

        CString path = fFullPath(m_currCat, m_fileDir); // also the working dir

        if ((UINT) ShellExecute(m_hWnd, 0, path + s, 0, path, SW_SHOWNORMAL) >= 32)
            return; // selected file succesfully launched
    }

    MessageBeep(0);
}

    // Adjust specified menu entry and label text to indicate current sort order
void CMainDlgWindow::AdjustDisplay(CCmdUI& cui, int ix_, c4_Property& prop_,
                                    int label_, const char* text_)
{
    bool match = m_sortProp == &prop_;

    cui.m_nIndex = ix_;
    cui.SetRadio(match);

        // include "+" or "-" in the label corresponding to the current sort field
    CString s = text_;
    if (match)
        s += m_sortReverse ? " (-)" : " (+)";

    CWnd* wnd = GetDlgItem(label_);
    ASSERT(wnd);

    wnd->SetWindowText(s);
}

    // Sort the file list and adjust menu items and label texts
void CMainDlgWindow::SortFileList(c4_Property& prop_, bool toggle_)
{
    if (m_sortProp != &prop_)
    {
        m_sortProp = &prop_;
        m_sortReverse = false;
    }
    else if (toggle_)
        m_sortReverse = !m_sortReverse;

        // update all menu check marks here, since CCmdUI doesn't work in dialogs
    CMenu* menu = GetMenu();
    ASSERT(menu);

    menu = menu->GetSubMenu(0); // the "File" menu
    ASSERT(menu);

    CMenu* sub = menu->GetSubMenu(1); // the "Sort Files" entry
    ASSERT(sub);

        // use CCmdUI, not CheckMenuItem, because it can set nice bullet marks
    CCmdUI cui;
    cui.m_pMenu = sub;
    cui.m_nIndexMax = sub->GetMenuItemCount();
    ASSERT(cui.m_nIndexMax == 5); // name, size, date, <sep>, reverse

    AdjustDisplay(cui, 0, pName, IDC_NAME_LABEL, "File &name");
    AdjustDisplay(cui, 1, pSize, IDC_SIZE_LABEL, "Size");
    AdjustDisplay(cui, 2, pDate, IDC_DATE_LABEL, "Date");

        // the "Reverse" menu item uses a regular check mark
    cui.m_nIndex = 4;
    cui.SetCheck(m_sortReverse);

        // sorting may take some time
    HCURSOR oldCursor = SetCursor(LoadCursor(0, IDC_WAIT));

        // figure out the index of the row that was selected, if any
    int n = m_fileList.GetCurSel();
    if (n >= 0)
    {
        n = m_fileView.GetIndexOf(m_fileSort [n]);
        ASSERT(n >= 0);
    }

        // define the sort order and make sure the list is redrawn
    if (m_sortReverse)
        m_fileSort = m_fileView.SortOnReverse(prop_, prop_);
    else
        m_fileSort = m_fileView.SortOn(prop_);

    m_fileList.Invalidate();

        // restore the selection to the original item
    if (n >= 0)
    {
        int m = m_fileSort.Find(m_fileView [n]); // where is that row now?
        ASSERT(m >= 0);

        m_fileList.SetCurSel(m);
    }

    SetCursor(oldCursor);
}

void CMainDlgWindow::OnSortByName()
{
    SortFileList(pName);
}

void CMainDlgWindow::OnSortBySize()
{
    SortFileList(pSize);
}

void CMainDlgWindow::OnSortByDate()
{
    SortFileList(pDate);
}

void CMainDlgWindow::OnSortReverse()
{
    SortFileList(*m_sortProp, true);
}

void CMainDlgWindow::OnLButtonDown(UINT nFlags, CPoint point)
{
        // catch mouse clicks on the header texts to alter the file sort order
    CWnd* wnd = ChildWindowFromPoint(point);
    if (wnd)
        switch (wnd->GetDlgCtrlID())
        {
            case IDC_NAME_LABEL:    SortFileList(pName, true); return;
            case IDC_SIZE_LABEL:    SortFileList(pSize, true); return;
            case IDC_DATE_LABEL:    SortFileList(pDate, true); return;

            case IDC_LOGO1:             // handle clicks on the fake logo
            case IDC_LOGO2:
            case IDC_LOGO3:         OnAppAbout(); return;
        }

    CDialog::OnLButtonDown(nFlags, point);
}

/////////////////////////////////////////////////////////////////////////////
// The following class maintains most of the state required to iterate
// over all entries to satisfy a find request. This is a pretty messy
// approach to be able to use this in both forward and backward modes.

    class CFindState
    {
    public:
        CFindState (CMainDlgWindow& dlg_)
            : _dlg (dlg_), findStorage (0)
        {
                // searching may take some time
            oldCursor = SetCursor(LoadCursor(0, IDC_WAIT));
        }

        ~CFindState ()
        {
            SetCursor(oldCursor);

            findCat = c4_View();
            findList = c4_View();
            delete findStorage;
        }

        bool Initialize()
        {
            lastCat = _dlg.m_catList.GetCurSel();
            if (lastCat < 0 || _dlg.m_treeDir < 0 || _dlg.m_fileDir < 0)
            {
                MessageBeep(0);
                return false;
            }

            findCatName = _dlg.m_currCatName;
            findCat = _dlg.m_currCat;
            findList = _dlg.m_fileSort;

                // prepare for iteration
            lastDir = _dlg.m_fileDir;
            lastSel = _dlg.m_fileList.GetCurSel(); // can be -1

            return true;
        }

        void SetSort(const c4_View& view_)
        {
            ASSERT(_dlg.m_sortProp);
            c4_Property& prop = *_dlg.m_sortProp;

            if (_dlg.m_sortReverse)
                findList = view_.SortOnReverse(prop, prop);
            else
                findList = view_.SortOn(prop);
        }

        bool IsStartDir(int dir_, int cat_)
        {
            return dir_ == lastDir && cat_ == lastCat;
        }

        void Select(int sel_, int dir_)
        {
                // adjust to the found catalog and directory
            _dlg.SetCatalog(findCatName);
            _dlg.SetTreeDir(dir_);
                // then match the selection and update the status fields
            _dlg.m_fileList.SetCurSel(sel_);
            _dlg.OnSelchangeFileList();

            _dlg.m_fileList.SetFocus();     // so arrows work as expected
            _dlg.m_fileList.UpdateWindow(); // show before new find can start
        }

        void UseCatalog(int cat_)
        {
                // show which catalog we're currently searching
            _dlg.m_catList.SetCurSel(cat_);

            findCat = c4_View();
            findList = c4_View();
            delete findStorage;
            findStorage = 0;

            _dlg.m_catList.GetText(cat_, findCatName);
            findStorage = DEBUG_NEW c4_Storage (findCatName, false);
            findCat = findStorage->View("dirs");
        }

            // check if any key is pressed, this aborts a lengthy find
        bool WantsToQuit() const
        {
            MSG msg;
                // careful, there may still be keyup's in the queue
            if (!::PeekMessage(&msg, NULL, WM_CHAR, WM_CHAR, PM_NOREMOVE))
                return false;

            while (::PeekMessage(&msg, NULL, WM_KEYFIRST, WM_KEYLAST, PM_REMOVE))
                ; // flush all key events

            return true;
        }

        CMainDlgWindow& _dlg;
        int lastCat, lastDir, lastSel;
        c4_Storage* findStorage;
        CString findCatName;
        c4_View findCat, findList;
        HCURSOR oldCursor;
    };

/////////////////////////////////////////////////////////////////////////////
// Several aspects of the find code below affect search performance:
//
//  1.  Each catalog is opened without calculating any statistics
//  2.  Only match fields are accessed, for optimal use of on-demand loading
//  3.  Sorting is only performed *after* at least one entry has been found
//
// As a result, searching is quite fast (and THAT is an understatement).

void CMainDlgWindow::OnFindNext()
{
    CFindState state (*this);
    if (!state.Initialize())
        return;

        // prepare for iteration
    int cat = state.lastCat;
    int dir = state.lastDir;
    int sel = state.lastSel;

    bool mustSort = false; // avoid resorting when a sorted list is available
    bool first = true; // watch out for infinite loop if never found an entry

    for (;;) // loop over each catalog
    {
        int dirCount = state.findCat.GetSize();

        while (dir < dirCount) // loop over each subdirectory
        {
            c4_View files = pFiles (state.findCat [dir]);
            int selCount = files.GetSize();

                // on first entry into dir, first scan for match in unsorted list
                // this *drastically* improves performance if most dirs are a miss
            if (sel < 0 && m_findDlg.NeedsCompare())
            {
                while (++sel < selCount) // loop over each file
                    if (m_findDlg.Match(files[sel]))
                    {
                        sel = -1; // something matches, prepare to search sorted
                        break;
                    }

                // at this point sel is either -1 or selCount
            }

                // only sort if we're really going to use this to scan
            if (mustSort && sel < selCount)
                state.SetSort(files);

            while (++sel < selCount) // loop over each file
                if (m_findDlg.Match(state.findList [sel]))
                {
                    if (!first && sel >= state.lastSel &&
                                    state.IsStartDir(dir, cat))
                        break; // oops, second time around in start dir, fail

                    state.Select(sel, dir);
                    return;
                }

                // if we fell through start dir for the second time, then fail
                // this scans for too many entries but works on empty start dir
            if (state.WantsToQuit() || !first && state.IsStartDir(dir, cat))
            {
                    // wrapped around, nothing found
                m_catList.SetCurSel(state.lastCat);
                MessageBeep(0);
                return;
            }

            first = false;

            sel = -1;
            ++dir; // directories are scanned in breadth first order, hmmm...
            mustSort = true;
        }

        dir = 0;

        if (m_findDlg.m_singleCat)
            continue; // don't switch to another catalog file

        if (++cat >= m_catList.GetCount())
            cat = 0;

        state.UseCatalog(cat);
    }
}

void CMainDlgWindow::OnFindPrev()
{
    CFindState state (*this);
    if (!state.Initialize())
        return;

        // prepare for iteration
    int cat = state.lastCat;
    int dir = state.lastDir;
    int sel = state.lastSel;

    bool mustSort = false; // avoid resorting when a sorted list is available
    bool first = true; // watch out for infinite loop if never found an entry

    for (;;) // loop over each catalog
    {
        if (dir < 0)
            dir = state.findCat.GetSize() - 1;

        while (dir >= 0) // loop over each subdirectory
        {
            c4_View files = pFiles (state.findCat [dir]);
            int selCount = files.GetSize();

            if (sel < 0)
                sel = selCount;

                // on first entry into dir, first scan for match in unsorted list
                // this *drastically* improves performance if most dirs are a miss
            if (sel >= selCount && m_findDlg.NeedsCompare())
            {
                while (--sel >= 0) // loop over each file
                    if (m_findDlg.Match(files[sel]))
                    {
                        sel = selCount; // matches, prepare to search sorted
                        break;
                    }

                // at this point sel is either -1 or selCount
            }

                // only sort if we're really going to use this to scan
            if (mustSort && sel >= 0)
                state.SetSort(files);

            while (--sel >= 0) // loop over each file
                if (m_findDlg.Match(state.findList[sel]))
                {
                    if (!first && sel <= state.lastSel &&
                                    state.IsStartDir(dir, cat))
                        break; // oops, second time around in start dir, fail

                    state.Select(sel, dir);
                    return;
                }

                // if we fell through start dir for the second time, then fail
                // this scans for too many entries but works on empty start dir
            if (state.WantsToQuit() || !first && state.IsStartDir(dir, cat))
            {
                    // wrapped around, nothing found
                m_catList.SetCurSel(state.lastCat);
                MessageBeep(0);
                return;
            }

            first = false;

            sel = -1;
            --dir; // directories are scanned in breadth first order, hmmm...
            mustSort = true;
        }

        ASSERT(dir == -1);

        if (m_findDlg.m_singleCat)
            continue; // don't switch to another catalog file

        if (cat == 0)
            cat = m_catList.GetCount();
        --cat;

        state.UseCatalog(cat);
    }
}

/////////////////////////////////////////////////////////////////////////////
// $Id: catfish.cpp,v 1.2 1996/12/04 14:49:22 jcw Exp $