Developer CD Series 1994 November: Tool Chest/Dev.CD Nov 94.toast/Sample Code/Macintosh Sample Code/SC.021.ModalList/ModalList.c

C/C++ Source or Header | 1992-06-12 | 17.4 KB | 587 lines | [TEXT/MPS ]

/*
#
#    Apple Macintosh Developer Technical Support
#
#    ModalList : Simple Modal Dialog and List Manager Sample Application
#
#    ModalList.c - Main Segment
#
#    Copyright © 1989 Apple Computer, Inc.
#    All rights reserved.
#
#    Versions:
#            1.00                     10/89
#            1.01                    06/92
#
#    Components:
#            ModalList.make            October 1, 1989
#            ModalList.h                October 1, 1989
#            ModalList.c                October 1, 1989
#            ModalListInit.c            June 12, 1992
#            ModalList.r                October 1, 1989
#            TCModalList.π            June 12, 1992
#            TCModalList.π.rsrc        June 12, 1992
#
#    ModalList is an example application that demonstrates
#    how to use the Dialog Manager and List Manager routines
#    together. It is not a good example of a sample application
#    but a great example of the use of lists in a dialog. The
#    default LDEF is used to display a 2 dimensional list of strings.
#    Each cell's string is initialized to represent it's position in the
#    list. The user can change these strings and search for a particular
#    setting. Once again this is not meant as an example application and
#    there are some features that are documented in the source listing
#    that you should pay close attention to inorder to understand how
#    this example works.
#
*/

#pragma segment Main

#include <QuickDraw.h>
#include <Fonts.h>
#include <Controls.h>
#include <Dialogs.h>
#include <Windows.h>
#include <TextEdit.h>
#include <Memory.h>
#include <Lists.h>
#include <SegLoad.h>
#include <Packages.h>
#include "ModalList.h"

/* Here are the prototypes.
*/

Boolean                MyList(void);                                /* Modal Dialog loop */

pascal void            MyItem(DialogPtr, short);                    /* Dialog Manger call backs */
pascal Boolean        MyFilter(DialogPtr, EventRecord *, short *);

pascal Boolean        MyClikLoop(void);                             /* List Manger call backs */
pascal short        MySearch(Ptr, Ptr, short, short);

void                LDeselect(ListHandle);                        /* utility routines */
long                Cell2String(Point, char *);

/* _DataInit() is part of the MPW runtime library. This external
** reference to it is done so that its segment can be unloaded, %A5Init.
*/
#ifndef THINK_C
extern void _DataInit();
#endif

main()
{
#ifndef THINK_C
    UnloadSeg((Ptr) _DataInit);        /* note that _DataInit must not be in Main! */
#endif

    MaxApplZone();                    /* expand the heap so code segments load at the top */

    Initialize();
    UnloadSeg((Ptr) Initialize);    /* note that Initialize must not be in Main! */

    (void) MyList();                /* this sample ignores the return value */
}


/* a utility routine to deselect all selected cells in the list.
*/

void LDeselect(ListHandle list)
{
    auto    Point        cell;

    /* start with the upper left cell
    */
    SetPt(&cell, 0, 0);

    /* for each selected cell
    */
    while(LGetSelect(true, &cell, list))

        /* deselect and unhilite it
        */
        LSetSelect(false, cell, list);
}

/* a click loop procedure that does nothing but prove it can be done.
*/

pascal Boolean MyClikLoop(void)
{
    return(true);
}

/* a custom search procedure that is case sensitive. the standard list search procedure
** uses IUMagIDString which is case insensitive.
** Parameters:    Ptr        aPtr;        the cell data
**                Ptr        bPtr;        the search pattern
**                short    aLen, bLen;    the lengths
*/

pascal short MySearch(Ptr aPtr, Ptr bPtr, short aLen, short bLen)
{
    return (0 != IUMagString(aPtr, bPtr, aLen, bLen));
}

/* this routine will be called by the Dialog Manager to draw the outline of the
** default button and the list.
*/

pascal void MyItem(DialogPtr dialog, short itemNo)
{
    auto    short        itemType;
    auto    Handle        itemHandle;
    auto    Rect        itemRect;

    auto    ListHandle    list;

    GetDItem(dialog, itemNo, &itemType, &itemHandle, &itemRect);
    switch(itemNo) {

    /* outline the default button (see IM I-407).  in this case it is the OK button.
    ** this lets the user know that pressing the return will have the same effect as
    ** clicking this button.
    */
    case cOKOutlineItem :
        PenSize(3, 3);
        InsetRect(&itemRect, -4, -4);
        FrameRoundRect(&itemRect, 16, 16);
        PenSize(1, 1);
        break;

    /* draw the list. the List Manager will draw the cells and scrollbars but does not
    ** draw a border around the list's view rectangle, so it is done here also.
    */
    case cListItem :

        /* recover the list handle. it was stuffed into the dialog window's refCon
        ** field when is was created.
        */
        list = (ListHandle) ((DialogPeek)dialog)->window.refCon;

        /* let the List Manager draw the list
        */
        LUpdate(dialog->visRgn, list);

        /* drawn the lists framing rectangle OUTSIDE the view rectangle.
        ** if the frame is drawn inside the view rectangle then these lines
        ** will be erased, drawn onto or scrolled by the List Manager since the lines
        ** are within the rectangle LM expects to be able to draw in.
        */
        InsetRect(&itemRect, -1, -1);
        FrameRect(&itemRect);
        break;
    }
}

/* we need to be able to process mouse clicks in the list. the Dialog Manager makes this
** possible through filter procedures like this one. since the default filter procedure
** will be replaced we also need to handle return key presses.
*/

pascal Boolean MyFilter(DialogPtr dialog, EventRecord *event, short *itemHit)
{
    auto    ListHandle    list;
    auto    Point        cell;
    auto    char        character;
    auto    Point        where;
    auto    Rect        itemRect;
    auto    short        itemType;
    auto    Handle        itemHandle;
    auto    Str255        string;
    auto    short        length;

    switch (event->what) {

    /* watch for mouse clicks in the List
    */
    case mouseDown :
        GetDItem(dialog, cListItem, &itemType, &itemHandle, &itemRect);
        where = event->where;
        GlobalToLocal(&where);

        /* if the user has clicked in the list then we'll handle the processing here
        */
        if (PtInRect(where, &itemRect)) {

            /* recover the list handle. it was stuffed into the dialog window's refCon
            ** field when it was created.
            */
            list = (ListHandle) ((DialogPeek)dialog)->window.refCon;

            /* let the List Manager process the mouse down. this includes cell selection
            ** dragging, scrolling and double clicks by the user.
            */
            if (LClick(where, event->modifiers, list)) {

                /* a double click in a cell has occured.
                ** find out in which one of the cells the user has double clicked in.
                */
                cell = LLastClick(list);

                /* copy this cell's contents to the text edit box in the dialog
                */
                GetDItem(dialog, cTextItem, &itemType, &itemHandle, &itemRect);
                length = 255;
                LGetCell(&string[1], &length, cell, list);
                string[0] = (char) length;
                SetIText(itemHandle, string);
            }

            /* tell the application that the list has been clicked in.
            */
            *itemHit = cListItem;

            /* tell the Dialog Manager that the event has been handled.
            */
            return true;
        }
        break;

    /* be sure and return this information so the Dialog Manager will process the
    ** return and enter key presses as clicks by the user in the OK button. this is
    ** only required because we have overridden the Dialog Manager's default filtering.
    */
    case keyDown :
    case autoKey :
        character = event->message;
        if ('\n' == character) {

            /* tell the application that the OK button has been clicked by the user.
            */
            *itemHit = ok;

            /* tell the Dialog Manger that the event has been handled and the
            ** character should not be added to the text edit field.
            */
            return true;
        }
        break;
    }

    /* tell the Dialog Manger that the event has NOT been handled and that it should
    ** take further action on this event.
    */
    return false;
}

/* this routine will not return until the user has dismissed the modal dialog with
** a press of the return key or a click in the ok or cancel buttons. it displays a
** list, check boxes for setting selection flags, a text edit field for searching and setting
** cell data and the usual ok and cancel buttons. the list uses the default LDEF procedure.
**
** if you double click in a cell the cells contents will be moved to the
** text edit field. edit the field and click the set button and you will have edited the
** cell contents.
**
** note that the Set button sets the last cell clicked in to the contents of the text edit field.
** it does not necessarily set the cell which is selected or hilited but it sets the cell that
** LLastClick returns. it is sort of a funky user interface but it does demonstrate the
** use of LLastClick.
**
** if you scroll the list all the way to the right you will notice that there is some extra
** white space to the right of the right most cell. this was done intentionally to show what
** can happen when the lists viewing rectangle is not an even multiple of the cell rectangles.
** the List Manager must scroll this extra bit so that it can display the entire width of the
** right most cells. notice too that the bottom most cell does not display this behavior since
** the height of the list's viewing rectangle is an even multiple of the cell height.
**
** note that a call to LSetSelect will select or hilite a cell which is empty even though
** the list's selection flags field is set to lNoNilHilite. the selection flags
** are used only by the LClick routine they do not prevent the program from selecting
** cells with LSetSelect in such a way that may seem inconsistent with their
** setting. this peculiarity can also happen with other selection flag settings and the
** LSetSelect call.
**
** notice also that the column widths are all equal, there is no way to make cells with different
** column widths using the List Manager.
**
** there have been requests for the capability to have multiple lists displayed in a
** window and have them both scrolled by one scrollbar. the only way to accomplish this
** would be to make new lists without the List Manager's scrollV or scrollH scrollbars.
** then create a new scrollbar using the Control Manager and setup an action procedure for
** TrackControl which calls LScroll for each of the lists. this is not demonstrated in
** this sample program.
**
*/

Boolean MyList(void)
{
    auto    DialogPtr    dialog;            /* a dialog containing the list item */

    auto    short        itemNo;            /* the item in the dialog selected */
    auto    short        itemType;        /* dummy parameter for call to GetDItem */
    auto    Handle        itemHandle;        /* dummy parameter for call to GetDItem */
    auto    Rect        itemRect;         /* the location of the list in the dialog */

    auto    ListHandle    list;            /* the list constructed in the dialog */
    auto    Rect        dataBounds;        /* the dimensions of the data in the list */
    auto    Point        cellSize;        /* width and height of a cells rectangle */
    auto    Point        cell;            /* an index through the list */

    auto    char        string[255];
    auto    short        length;

    auto    short        checked;        /* flag for setting and getting check box value */
    auto    short        bit;            /* used as a mask to test the selection flags */

    /* create a new dialog window
    */
    dialog = GetNewDialog(cDLOGID, (Ptr) 0, (WindowPtr) -1);
    SetPort((GrafPtr) dialog);

    /* set the procedure pointer for the user items in the dialog.
    ** this will allow he default button to be outlined and the list to be drawn
    ** by the Dialog Manger.
    */
    GetDItem(dialog, cOKOutlineItem, &itemType, &itemHandle, &itemRect);
    SetDItem(dialog, cOKOutlineItem, itemType, (Handle) MyItem, &itemRect);

    GetDItem(dialog, cListItem, &itemType, &itemHandle, &itemRect);
    SetDItem(dialog, cListItem, itemType, (Handle) MyItem, &itemRect);

    /* make room for scroll bars (see IM IV-270)
    */
     itemRect.right -= 15;
     itemRect.bottom -= 15;

    /* create a list
    */
    SetRect(&dataBounds, 0, 0, cListCols, cListRows);
    SetPt(&cellSize, cListCellWidth, cListCellHeight);
    list = LNew(&itemRect, &dataBounds, cellSize, 0, (WindowPtr) dialog, false, false, true, true);

    /* allow the dialog manager routines to access the list record
    */
    ((DialogPeek)dialog)->window.refCon = (long) list;

    /* use the custom click loop procedure
    */
    (*list)->lClikLoop = (ProcPtr) MyClikLoop;

    /* use the default selection flags
    */
    (*list)->selFlags = 0;

    /* initialize the check boxes in the dialog according
    ** to the settings of the list's selection flags
    */
    bit = 2;
    itemNo = cNoNilHiliteItem;
    while (itemNo <= cOnlyOneItem) {

        GetDItem(dialog, itemNo, &itemType, &itemHandle, &itemRect);
         checked = ((*list)->selFlags == ((*list)->selFlags | bit)) ? 1 : 0;
         SetCtlValue((ControlHandle) itemHandle, checked);

        bit *= 2;
        ++itemNo;
       }

    /* initialize the cell's contents.
    */
    for (cell.v = 0; cell.v < (**list).dataBounds.bottom; ++cell.v) {
        for (cell.h = 0; cell.h < (**list).dataBounds.right; ++cell.h) {

            /* make a string representing the cell's position in the list.
            */
            length = Cell2String(cell, string);

            /* initialize the cell contents to this string.
            **
            ** you would initialize your cell data with what ever is appropriate
            ** for your application here.
            */
            LSetCell(string, length, cell, list);
        }
    }

    /* turn cell drawing on only after the cell contents have been initialized.
    ** this will avoid watching the delay between the LSetCells calls and is faster.
    */
    LDoDraw(true, list);

    do {

        /* process hits in the dialog.
        */
        ModalDialog(MyFilter, &itemNo);

        switch(itemNo) {

        /* process hits in the OK button.
        */
        case ok :

            /* find out which cells have been selected.
            */
            SetPt(&cell, 0, 0);
            while(LGetSelect(true, &cell, list)) {

                /* there is nothing to do with the user's selections in this sample
                ** so i'll just deselect the cells the users has selected.
                */
                LSetSelect(false, cell, list);
            }
            break;

        /* process hits in the Find button.
        */
        case cFindItem :

            GetDItem(dialog, cTextItem, &itemType, &itemHandle, &itemRect);
            GetIText(itemHandle, string);

            /* search for a match in the list.
            ** start the search at the upper left most cell in the list.
            **
            ** the List Manger performs the searchs row by row until it finds
            ** the first match. this order can not be changed without writing a
            ** replacement to LSearch, probably making use of LGetCell, LNextCell and
            ** the International search routines.
            */
            SetPt(&cell, 0, 0);

            /* deselect all cells which are currently selected.
            */
            LDeselect(list);

            /* use the custom search procedure.
            ** the default search procedure is not case sensitive.
            */
            if (LSearch(&string[1], string[0], MySearch, &cell, list)) {

                /* hilite the cell which contains the matching string.
                **
                ** note that this call will select or hilite a cell which is empty
                ** when the users search string is empty even though the list's
                ** selection flags field is set to lNoNilHilite. the selection flags
                ** are used only by the LClick routine they do not prevent the program
                ** from selecting cells with LSetSelect in such a way that may seem
                ** inconsistent with their setting. this peculiarity can also happen
                ** with other selection flag settings and the LSetSelect call.
                */
                LSetSelect(true, cell, list);

                /* if the matching cell is not visible it will be scrolled into view.
                */
                LAutoScroll(list);
            }
            break;

        /* process hits in the Set button.
        */
        case cSetItem :
            GetDItem(dialog, cTextItem, &itemType, &itemHandle, &itemRect);
            GetIText(itemHandle, string);

            /* find out which was the last cell clicked in by the user.
            ** not the last cell dragged into, or the last cell selected but the
            ** last cell a mouse down event occured in.
            */
            cell = LLastClick(list);
            if (0 <= cell.h && 0 <= cell.v) {


                /* if a cell has been clicked in then deselect all cells which are
                ** currently selected.
                */
                LDeselect(list);

                /* set the cell to the string the user has entered.
                */
                LSetCell(&string[1], string[0], cell, list);

                /* notice that this will Hilite an empty cell even with
                ** the list's selection flags set to lNoNilHilite.
                */
                LSetSelect(true, cell, list);

                /* if the last cell clicked in is not visible it will be scrolled
                ** into view.
                */
                LAutoScroll(list);
            }
            break;

        /* process hits in the check boxes representing the list's selection flags.
        */
        case cOnlyOneItem :
        case cExtendDragItem :
        case cNoDisjointItem :
        case cNoExtendItem :
        case cNoRectItem :
        case cUseSenseItem :
        case cNoNilHiliteItem :

            /* deselect all cells which are currently selected.
            */
            LDeselect(list);

            /* toggle the check box.
            */
            GetDItem(dialog, itemNo, &itemType, &itemHandle, &itemRect);
              checked = GetCtlValue((ControlHandle) itemHandle);
              SetCtlValue((ControlHandle) itemHandle, !checked);

            /* adjust the selection flags to the users new settings.
            */
            switch (itemNo) {
            case cOnlyOneItem :
                (*list)->selFlags ^= lOnlyOne; break;
            case cExtendDragItem :
                (*list)->selFlags ^= lExtendDrag; break;
            case cNoDisjointItem :
                (*list)->selFlags ^= lNoDisjoint; break;
            case cNoExtendItem :
                (*list)->selFlags ^= lNoExtend; break;
            case cNoRectItem :
                (*list)->selFlags ^= lNoRect; break;
            case cUseSenseItem :
                (*list)->selFlags ^= lUseSense; break;
            case cNoNilHiliteItem :
                (*list)->selFlags ^= lNoNilHilite; break;
            }

            break;
        }
    } while ((itemNo != ok) && (itemNo != cancel));

    /*  kill the list and dialog.
    */
    LDispose(list);
    DisposDialog(dialog);

    /* return true if OK or RETURN key was hit.
    */
    return (ok == itemNo);
}

/* just a funky routine to create strings for the cell's data
*/

long Cell2String(Point pt, char *string)
{
    auto    short        index;
    auto    Str255        rowStr;
    auto    Str255        colStr;

    NumToString((long)pt.v, rowStr);
    *(string)++ = 'R';
    for (index = 1; index <= rowStr[0]; ++index)
        *(string++) = rowStr[index];

    *(string)++ = ',';
    *(string)++ = ' ';

    NumToString((long)pt.h, colStr);
    *(string)++ = 'C';
    for (index = 1; index <= colStr[0]; ++index)
        *(string++) = colStr[index];

    return colStr[0] + rowStr[0] + 4;
}