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VLB.ZIP
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VLB.C
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1990-05-01
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/*
** vlb.c Virtual List Box Source Code file
**
** Author: Robert A. Wood
** Executive Micro Systems
** 1716 Azurite Trail
** Plano, TX 75075
**
** Microsoft C version 5.1 / medium memory model
** Microsoft Windows SDK version 2.1
** Runtime: Windows 286 version 2.1
**
** Date: 03/19/90
*/
#include <windows.h>
#undef min
#undef max
#include <stdlib.h>
#include <stdio.h>
#include "vlb.h"
#include "lmem.h"
static char StringBuffer[ VLBSTRLEN + 1 ];
static char szVLBPropName[] = "VLB";
static FARPROC lpfnVLBProc = NULL;
LPSTR FAR PASCAL lstrcpy (LPSTR, LPSTR) ;
WORD FAR PASCAL Rpad( LPSTR str, WORD length );
/*
** Virtual List Box initialization function
********************************************************************/
BOOL FAR PASCAL InitVLB( HANDLE hInstance, HWND hDlg,
WORD ListBoxId, VLBPROC VLBCallBack )
{
int x;
HANDLE hCtl;
HANDLE hVLB;
LPVLB lpVLB;
HDC hDC;
TEXTMETRIC tm; // need info about character sizes
LONG FAR * lpStringIds;
// check that a call back function address was passed in
if( ! VLBCallBack )
{
MessageBeep( 0 );
MessageBox( hDlg, "Invalid VLBCallBack", NULL,
MB_ICONHAND | MB_OK );
return( FALSE );
}
// check for existence of ListBoxId in specified dialog box
if( ( hCtl = GetDlgItem( hDlg, ListBoxId ) ) == NULL )
{
MessageBeep( 0 );
MessageBox( hDlg, "Invalid List Box Id", NULL,
MB_ICONHAND | MB_OK );
return( FALSE );
}
// allocate VLB control information structure
if( hVLB = GlobalAlloc( GHND, (LONG)sizeof( VLB ) ) )
lpVLB = (LPVLB)GlobalLock( hVLB );
else
{
SendMessage( hDlg, WM_COMMAND, ListBoxId,
MAKELONG( hCtl, VLBN_ERRSPACE ) );
return( FALSE );
}
hDC = GetDC( hCtl );
GetTextMetrics( hDC, &tm );
ReleaseDC( hCtl, hDC );
lpVLB->ListBoxId = ListBoxId;
lpVLB->MultiSelection = (BOOL)
(GetWindowLong( hCtl, GWL_STYLE ) & LBS_MULTIPLESEL);
GetClientRect( hCtl, &lpVLB->ClientRect );
lpVLB->CharWidth = tm.tmAveCharWidth;
lpVLB->CharHeight = tm.tmHeight + tm.tmExternalLeading;
lpVLB->DisplayStrings = (BYTE)
lpVLB->ClientRect.bottom / lpVLB->CharHeight;
lpVLB->DisplayChars = (BYTE)
lpVLB->ClientRect.right / lpVLB->CharWidth;
lpVLB->FocusString = 0;
lpVLB->FirstDisplayString = 0;
lpVLB->TotalSelectedStrings = 0;
lpVLB->MaxSelectedStrings = lpVLB->DisplayStrings;
VLB_CALLBACK = VLBCallBack;
lpVLB->SelectedStringId = -1;
// allocate buffer for displayed strings
if( !(lpVLB->hDisplayBuffer = GlobalAlloc( GHND, (LONG)
(lpVLB->DisplayStrings * (lpVLB->DisplayChars + 1) ) ) ) )
{
GlobalUnlock( hVLB );
GlobalFree( hVLB );
SendMessage( hDlg, WM_COMMAND, ListBoxId,
MAKELONG( hCtl, VLBN_ERRSPACE ) );
return( FALSE );
}
// allocate array of longs for the string Ids of displayed strings
if( !(lpVLB->hStringIds = GlobalAlloc( GHND, (LONG)
(lpVLB->DisplayStrings * sizeof( LONG ) ) ) ) )
{
GlobalUnlock( lpVLB->hDisplayBuffer );
GlobalFree( lpVLB->hDisplayBuffer );
GlobalUnlock( hVLB );
GlobalFree( hVLB );
SendMessage( hDlg, WM_COMMAND, ListBoxId,
MAKELONG( hCtl, VLBN_ERRSPACE ) );
return( FALSE );
}
// initialize string Ids to -1
lpStringIds = (LONG FAR *) GlobalLock( lpVLB->hStringIds );
for( x = 0; x < lpVLB->DisplayStrings; x++, lpStringIds[x] = -1L )
;
GlobalUnlock( lpVLB->hStringIds );
// setup for a multiselection list box
if( lpVLB->MultiSelection )
{
LONG FAR * lpSelectedStringIds;
// allocate array of longs for the selected string Id's
if( !(lpVLB->hSelectedStringIds = GlobalAlloc( GHND, (LONG)
(lpVLB->MaxSelectedStrings * sizeof( LONG ) ) ) ) )
{
GlobalUnlock( lpVLB->hStringIds );
GlobalFree( lpVLB->hStringIds );
GlobalUnlock( lpVLB->hDisplayBuffer );
GlobalFree( lpVLB->hDisplayBuffer );
GlobalUnlock( hVLB );
GlobalFree( hVLB );
SendMessage( hDlg, WM_COMMAND, ListBoxId,
MAKELONG( hCtl, VLBN_ERRSPACE ) );
return( FALSE );
}
// initialize selected string Ids to -1
lpSelectedStringIds = (LONG FAR *)
GlobalLock( lpVLB->hSelectedStringIds );
for( x = 0; x < lpVLB->DisplayStrings;
x++, lpSelectedStringIds[x] = -1L )
;
GlobalUnlock( lpVLB->hSelectedStringIds );
}
if( !lpfnVLBProc )
lpfnVLBProc = MakeProcInstance( (FARPROC) VLBProc, hInstance );
// subclass VLB
SetWindowLong( hCtl, GWL_WNDPROC, (LONG) lpfnVLBProc );
// store handle to VLB structure in the control's property list
SetProp( hCtl, szVLBPropName, hVLB );
// send create messages to control and to the VLB callback func
SendMessage( hCtl, WM_CREATE, 0, 0L );
VLB_CALLBACK( ListBoxId, VCB_CREATE, 0, 0L );
// get the vitual list box length and set the scroll range
lpVLB->TotalStrings = VLB_CALLBACK( ListBoxId, VCB_LENGTH, 0, 0L);
SetScrollRange( hCtl, SB_VERT, 0, (int)
lpVLB->TotalStrings - lpVLB->DisplayStrings - 1, TRUE );
// check for horizontally scrolling
if( GetWindowLong( hCtl, GWL_STYLE ) & WS_HSCROLL )
{
// get the vitual list box width and set the scroll range
lpVLB->TotalWidth = VLB_CALLBACK( ListBoxId, VCB_WIDTH, 0, 0L);
SetScrollRange( hCtl, SB_HORZ, 0, (int)
lpVLB->TotalWidth - 1, TRUE );
}
// load list box
VLB_CALLBACK( ListBoxId, VCB_SETFOCUS, 0, 0L );
SendMessage( hCtl, VLB_RELOAD, RELOAD_STRINGPOS, 0L );
VLB_CALLBACK( ListBoxId, VCB_KILLFOCUS, 0, 0L );
// I'm out of here
GlobalUnlock( hVLB );
return( TRUE );
}
/*
** Virtual List Box Procedure
********************************************************************/
LONG FAR PASCAL VLBProc( HWND hCtl, unsigned message,
WORD wParam, LONG lParam )
{
HANDLE hVLB;
LPVLB lpVLB;
LONG lThumb;
switch ( message )
{
case WM_CHAR:
break;
case WM_SETCURSOR: // override setting cursor
break;
case WM_GETDLGCODE: // don't let dialog manager have
return( DLGC_WANTARROWS ); // his way with the arrow keys
case WM_CREATE: // sent just after being subclassed
return( 1L );
case VLB_RELOAD: // reload the list box
LoadVLB( hCtl, wParam, lParam );
return( 1L );
case WM_PAINT: // this is where it all takes shape
hVLB = GetProp( hCtl, szVLBPropName );
lpVLB = (LPVLB) GlobalLock( hVLB );
PaintVLB( hCtl, lpVLB );
GlobalUnlock( hVLB );
break;
case WM_SETFOCUS:
HideCaret(hCtl);
hVLB = GetProp( hCtl, szVLBPropName );
lpVLB = (LPVLB) GlobalLock( hVLB );
VLB_CALLBACK( lpVLB->ListBoxId, VCB_SETFOCUS, 0, 0L );
FrameFocusString( hCtl, lpVLB, TRUE );
GlobalUnlock( hVLB );
break;
case WM_KILLFOCUS:
hVLB = GetProp( hCtl, szVLBPropName );
lpVLB = (LPVLB) GlobalLock( hVLB );
FrameFocusString( hCtl, lpVLB, FALSE );
InvertSelectedStrings( hCtl, lpVLB, (int)( lpVLB->FocusString -
lpVLB->FirstDisplayString ) );
VLB_CALLBACK( lpVLB->ListBoxId, VCB_KILLFOCUS, 0, 0L );
GlobalUnlock( hVLB );
break;
case WM_VSCROLL:
switch( wParam )
{
case SB_THUMBPOSITION:
LoadVLB( hCtl, RELOAD_STRINGPOS, (LONG)LOWORD( lParam ) );
break;
case SB_LINEDOWN:
case SB_LINEUP:
case SB_PAGEDOWN:
case SB_PAGEUP:
ScrollVLB( hCtl, wParam, NULL );
break;
}
break;
case WM_HSCROLL:
hVLB = GetProp( hCtl, szVLBPropName );
lpVLB = (LPVLB) GlobalLock( hVLB );
lThumb = -1;
switch( wParam )
{
case SB_THUMBPOSITION:
lThumb = (LONG)LOWORD( lParam );
lThumb = VLB_CALLBACK( lpVLB->ListBoxId, VCB_HTHUMB,
&lThumb, 0L );
LoadVLB( hCtl, RELOAD_STRINGS, 0L );
break;
case SB_LINEDOWN:
lThumb = VLB_CALLBACK( lpVLB->ListBoxId, VCB_RIGHT, 0, 0L );
LoadVLB( hCtl, RELOAD_STRINGS, 0L );
break;
case SB_LINEUP:
lThumb = VLB_CALLBACK( lpVLB->ListBoxId, VCB_LEFT, 0, 0L );
LoadVLB( hCtl, RELOAD_STRINGS, 0L );
break;
case SB_PAGEDOWN:
lThumb = VLB_CALLBACK( lpVLB->ListBoxId,VCB_PAGERIGHT,0,0L);
LoadVLB( hCtl, RELOAD_STRINGS, 0L );
break;
case SB_PAGEUP:
lThumb = VLB_CALLBACK( lpVLB->ListBoxId, VCB_PAGELEFT,0,0L);
LoadVLB( hCtl, RELOAD_STRINGS, 0L );
break;
}
if( lThumb >= 0 )
{
lThumb = (LONG)min( (int)lpVLB->TotalWidth - 1,
max( 0, (int)lThumb ) );
SetScrollPos( hCtl, SB_HORZ, (int)lThumb, TRUE );
}
GlobalUnlock( hVLB );
break;
case WM_MOUSEMOVE:
break;
case WM_LBUTTONDBLCLK:
SendMessage( GetParent( hCtl ), WM_COMMAND,
GetWindowWord( hCtl, GWW_ID ),
MAKELONG( hCtl, VLBN_DBLCLK ) );
break;
case WM_LBUTTONDOWN:
{
LONG lFocusString;
hVLB = GetProp( hCtl, szVLBPropName );
lpVLB = (LPVLB) GlobalLock( hVLB );
lpVLB->FocusString = lpVLB->FirstDisplayString +
( HIWORD( lParam ) / lpVLB->CharHeight );
SetSelectedString( hCtl, NULL, lpVLB );
InvalidateRect( hCtl, NULL, TRUE );
GlobalUnlock( hVLB );
break;
}
case WM_KEYDOWN:
{
BOOL CtrlKey = HIBYTE( GetKeyState( VK_CONTROL ) );
hVLB = GetProp( hCtl, szVLBPropName );
lpVLB = (LPVLB) GlobalLock( hVLB );
switch( wParam )
{
case ' ':
{
SetSelectedString( hCtl, wParam, lpVLB );
InvalidateRect( hCtl, NULL, TRUE );
break;
}
case VK_DOWN:
if( lpVLB->FocusString == lpVLB->FirstDisplayString +
lpVLB->DisplayStrings - 1 )
ScrollVLB( hCtl, SB_LINEDOWN, NULL );
SetFocusString( wParam, lpVLB );
if( ! CtrlKey )
SetSelectedString( hCtl, wParam, lpVLB );
InvalidateRect( hCtl, NULL, TRUE );
PaintVLB( hCtl, lpVLB );
break;
case VK_UP:
if( lpVLB->FocusString == lpVLB->FirstDisplayString )
ScrollVLB( hCtl, SB_LINEUP, NULL );
SetFocusString( wParam, lpVLB );
if( ! CtrlKey )
SetSelectedString( hCtl, wParam, lpVLB );
InvalidateRect( hCtl, NULL, TRUE );
PaintVLB( hCtl, lpVLB );
break;
case VK_NEXT:
if( lpVLB->FocusString == lpVLB->FirstDisplayString +
lpVLB->DisplayStrings - 1 )
ScrollVLB( hCtl, SB_PAGEDOWN, NULL );
SetFocusString( wParam, lpVLB );
if( ! CtrlKey )
SetSelectedString( hCtl, wParam, lpVLB );
InvalidateRect( hCtl, NULL, TRUE );
PaintVLB( hCtl, lpVLB );
break;
case VK_PRIOR:
if( lpVLB->FocusString == lpVLB->FirstDisplayString )
ScrollVLB( hCtl, SB_PAGEUP, NULL );
SetFocusString( wParam, lpVLB );
if( ! CtrlKey )
SetSelectedString( hCtl, wParam, lpVLB );
InvalidateRect( hCtl, NULL, TRUE );
PaintVLB( hCtl, lpVLB );
break;
case VK_HOME:
LoadVLB( hCtl, RELOAD_STRINGPOS, 0L );
SetFocusString( wParam, lpVLB );
if( ! CtrlKey )
SetSelectedString( hCtl, wParam, lpVLB );
InvalidateRect( hCtl, NULL, TRUE );
break;
case VK_END:
LoadVLB( hCtl, RELOAD_STRINGPOS, lpVLB->TotalStrings - 1 );
SetFocusString( wParam, lpVLB );
if( ! CtrlKey )
SetSelectedString( hCtl, wParam, lpVLB );
InvalidateRect( hCtl, NULL, TRUE );
break;
case VK_RIGHT:
case VK_LEFT:
{
int message;
if( wParam == VK_RIGHT )
{
if( CtrlKey )
message = VCB_PAGERIGHT;
else
message = VCB_RIGHT;
}
else
{
if( CtrlKey )
message = VCB_PAGELEFT;
else
message = VCB_LEFT;
}
lThumb = VLB_CALLBACK( lpVLB->ListBoxId, message, 0, 0L );
lThumb = (LONG)min( (int)lpVLB->TotalWidth - 1,
max( 0, (int)lThumb ) );
SetScrollPos( hCtl, SB_HORZ, (int)lThumb, TRUE );
LoadVLB( hCtl, RELOAD_STRINGS, 0L );
InvalidateRect( hCtl, NULL, TRUE );
break;
}
}
GlobalUnlock( hVLB );
break;
}
case VLB_SETCURSEL: // WM_USER+6 select specified StringId
case VLB_SETSEL: // WM_USER+7 sets selection of StringId
break;
case VLB_GETCOUNT: // WM_USER+1 get total virtual strings
case VLB_GETSELCOUNT: // WM_USER+2 get total selected strings
case VLB_GETSTRLEN: // WM_USER+3 get total string length
case VLB_GETSELSTR: // WM_USER+4 get the selected String
case VLB_GETSELID: // WM_USER+5 get selected StringId(s)
{
LONG lret = 0;
hVLB = GetProp( hCtl, szVLBPropName );
lpVLB = (LPVLB) GlobalLock( hVLB );
if( message == VLB_GETCOUNT )
lret = lpVLB->TotalStrings;
else if( message == VLB_GETSELCOUNT )
lret = lpVLB->TotalSelectedStrings;
else if( message == VLB_GETSTRLEN )
lret = lpVLB->CharWidth;
else if( message == VLB_GETSELSTR )
{
if( lpVLB->TotalSelectedStrings )
{
if( lpVLB->MultiSelection )
{
LONG FAR *lpSelectedStringIds =
(LONG FAR *)GlobalLock( lpVLB->hSelectedStringIds);
VLB_CALLBACK( lpVLB->ListBoxId, VCB_FULLSTRING,
lpSelectedStringIds + wParam, StringBuffer );
GlobalUnlock( lpVLB->hSelectedStringIds );
}
else
VLB_CALLBACK( lpVLB->ListBoxId, VCB_FULLSTRING,
&lpVLB->SelectedStringId, StringBuffer );
}
else
*StringBuffer = 0;
lret = (LONG)(LPSTR)StringBuffer;
}
else if( message == VLB_GETSELID )
{
if( lpVLB->MultiSelection )
lret = lpVLB->hSelectedStringIds;
else
lret = lpVLB->SelectedStringId;
}
GlobalUnlock( hVLB );
return( lret );
}
case WM_DESTROY:
hVLB = GetProp( hCtl, szVLBPropName );
lpVLB = (LPVLB) GlobalLock( hVLB );
VLB_CALLBACK( lpVLB->ListBoxId, VCB_DESTROY, 0, 0L );
GlobalFree( lpVLB->hDisplayBuffer );
GlobalFree( lpVLB->hStringIds );
if( lpVLB->MultiSelection )
GlobalFree( lpVLB->hSelectedStringIds );
GlobalUnlock( hVLB );
GlobalFree( hVLB );
RemoveProp( hCtl, szVLBPropName );
break;
default:
return( DefWindowProc( hCtl, message, wParam, lParam ) );
}
return( 0L );
}
//*******************************************************************
VOID FrameFocusString( HWND hCtl, LPVLB lpVLB, BOOL draw )
{
RECT Rect;
HDC hDC;
// is the focus string visible
if( lpVLB->FocusString >= lpVLB->FirstDisplayString &&
lpVLB->FocusString < lpVLB->FirstDisplayString +
lpVLB->DisplayStrings )
{
hDC = GetDC( hCtl );
Rect.left = lpVLB->ClientRect.left + 1;
Rect.right = lpVLB->ClientRect.right;
Rect.top = (WORD) ( (lpVLB->FocusString -
lpVLB->FirstDisplayString) * lpVLB->CharHeight) + 1;
Rect.bottom = Rect.top + lpVLB->CharHeight;
if( draw )
FrameRect( hDC, &Rect, GetStockObject( GRAY_BRUSH ) );
else // redraw string without frame
{
LPSTR lpString = (LPSTR)GlobalLock( lpVLB->hDisplayBuffer );
WORD nLine = (WORD)
( lpVLB->FocusString - lpVLB->FirstDisplayString );
// move display buffer pointer to focus string
lpString += nLine * ( lpVLB->DisplayChars + 1 );
TextOut ( hDC, 1, ( nLine * lpVLB->CharHeight ) + 1,
lpString, lpVLB->DisplayChars );
GlobalUnlock( lpVLB->hDisplayBuffer );
}
ReleaseDC( hCtl, hDC );
}
}
//*******************************************************************
VOID InvertSelectedStrings( HDC hCtl, LPVLB lpVLB, int StringPos )
{
int x;
LONG y;
RECT Rect;
int FirstString, LastString;
LONG FAR *lpStringIds;
HDC hDC;
hDC = GetDC( hCtl );
lpStringIds = (LONG FAR *)GlobalLock( lpVLB->hStringIds );
Rect.left = lpVLB->ClientRect.left + 1;
Rect.right = lpVLB->ClientRect.right;
if( StringPos < 0 ) // process all displayed strings
{
FirstString = 0;
LastString = (int)lpVLB->DisplayStrings - 1;
}
else
FirstString = LastString = StringPos;
if( lpVLB->MultiSelection )
{
LONG FAR *lpSelectedStringIds =
(LONG FAR *)GlobalLock( lpVLB->hSelectedStringIds );
for( x = FirstString; x <= LastString; x++ )
{
for( y = 0; y < lpVLB->TotalSelectedStrings; y++ )
{
if( lpStringIds[x] == lpSelectedStringIds[ y ] )
{
Rect.top = ( x * lpVLB->CharHeight ) + 1;
Rect.bottom = Rect.top + lpVLB->CharHeight;
InvertRect( hDC, &Rect );
break;
}
}
}
GlobalUnlock( lpVLB->hSelectedStringIds );
}
else // single selection
{
for( x = FirstString; x <= LastString; x++ )
{
if( lpStringIds[x] == lpVLB->SelectedStringId )
{
Rect.top = ( x * lpVLB->CharHeight ) + 1;
Rect.bottom = Rect.top + lpVLB->CharHeight;
InvertRect( hDC, &Rect );
break;
}
}
}
ReleaseDC( hCtl, hDC );
GlobalUnlock( lpVLB->hStringIds );
}
//*******************************************************************
WORD FAR PASCAL Rpad( LPSTR str, WORD length )
{
LPSTR cp = str; // pointer to string
int x; // current string position
for( x = 0; *cp; x++, cp++ ) // skip to end of string
;
for( ; x < length; x++, *cp++ = ' ' ) // pad string with spaces
;
*cp = 0; // NULL terminate string
return( length ); // return new string length
}
//*******************************************************************
BOOL FAR PASCAL LoadVLB( HWND hCtl, WORD wParam, LONG lParam )
{
int x;
HANDLE hVLB = GetProp( hCtl, szVLBPropName );
LPVLB lpVLB = (LPVLB)GlobalLock( hVLB );
LPSTR lpString = (LPSTR)GlobalLock( lpVLB->hDisplayBuffer );
LONG FAR *lpStringIds = (LONG FAR *)GlobalLock(lpVLB->hStringIds);
LONG l;
// initialize the DisplayBuffer and StringIds
lmemset( lpString, 0,
lpVLB->DisplayStrings * (lpVLB->DisplayChars + 1) );
for( x = 0; x < lpVLB->DisplayStrings; x++, lpStringIds[x] = -1L )
;
if( wParam == RELOAD_STRINGS )
VLB_CALLBACK( lpVLB->ListBoxId, VCB_STRING,
&lpStringIds[0], StringBuffer );
else if( wParam == RELOAD_STRINGPOS )
{
lpStringIds[0] = min( lParam,
lpVLB->TotalStrings - lpVLB->DisplayStrings );
lpVLB->FirstDisplayString = lpStringIds[0];
VLB_CALLBACK( lpVLB->ListBoxId, VCB_VTHUMB,
&lpStringIds[0], StringBuffer );
}
else if( wParam == RELOAD_STRINGID )
{
lpStringIds[0] = lParam;
VLB_CALLBACK( lpVLB->ListBoxId, VCB_STRING,
&lpStringIds[0], StringBuffer );
}
// load first DisplayString
StringBuffer[ lpVLB->DisplayChars ] = 0; // Null @ Display width
lstrcpy( lpString, StringBuffer ); // advance to next string
Rpad( lpString, lpVLB->DisplayChars ); // pad with spaces
for( x = 1; x < lpVLB->DisplayStrings; x++ )
{
l = lpStringIds[x - 1];
if( VLB_CALLBACK( lpVLB->ListBoxId, VCB_NEXT,
&l, StringBuffer ) )
{
StringBuffer[ lpVLB->DisplayChars ] = 0; // Null Terminate
lpString += lpVLB->DisplayChars + 1; // go to next str
lstrcpy( lpString, StringBuffer ); // copy buf to str
Rpad( lpString, lpVLB->DisplayChars ); // pad with spaces
lpStringIds[x] = l;
}
else
break;
}
InvalidateRect( hCtl, NULL, TRUE ); // Force WM_PAINT message
// set new scroll bar thumb postion
SetScrollPos( hCtl, SB_VERT, (int)lpVLB->FirstDisplayString,TRUE);
GlobalUnlock( lpVLB->hDisplayBuffer );
GlobalUnlock( lpVLB->hStringIds );
GlobalUnlock( hVLB );
return( TRUE );
}
//*******************************************************************
BOOL FAR PASCAL ScrollVLB( HWND hCtl, WORD wParam, int Scroll )
{
int x, scroll, ret = TRUE;
HANDLE hVLB = GetProp( hCtl, szVLBPropName );
LPVLB lpVLB = (LPVLB)GlobalLock( hVLB );
LPSTR lpString = (LPSTR)GlobalLock( lpVLB->hDisplayBuffer );
LONG FAR *lpStringIds = (LONG FAR *)GlobalLock(lpVLB->hStringIds);
LONG l;
LPSTR lpGoodStrings;
int nGoodStrings;
// Check if scroll request is possible
if( wParam == SB_LINEDOWN )
{ // at the end of the total strings
if( lpVLB->FirstDisplayString + lpVLB->DisplayStrings >
lpVLB->TotalStrings - 1 )
ret = FALSE;
else
scroll = 1;
lpVLB->ScrollWindow = 1;
}
else if( wParam == SB_LINEUP )
{
if( lpVLB->FirstDisplayString == 0 )
ret = FALSE;
else
scroll = 1;
lpVLB->ScrollWindow = -1;
}
else if( wParam == SB_PAGEDOWN )
{
if( lpVLB->FirstDisplayString + lpVLB->DisplayStrings >
lpVLB->TotalStrings - 1 )
ret = FALSE;
else
scroll = min( (int)lpVLB->DisplayStrings - 1,
(int)(lpVLB->TotalStrings - ( lpVLB->FirstDisplayString +
lpVLB->DisplayStrings ) ) );
lpVLB->ScrollWindow = scroll;
}
else if( wParam == SB_PAGEUP )
{
if( lpVLB->FirstDisplayString == 0 )
ret = FALSE;
else
scroll = min( (int)lpVLB->DisplayStrings - 1,
(int)lpVLB->FirstDisplayString );
lpVLB->ScrollWindow = scroll * -1;
}
else // scroll number of the Scroll 3rd paramater
{
lpVLB->ScrollWindow = Scroll;
if( Scroll < 0 )
{
Scroll = abs( Scroll ); // absolute scroll amount
wParam = SB_LINEUP; // scroll up
}
else if( Scroll > 0 )
wParam = SB_LINEDOWN; // scroll down
else // if( Scroll == 0 ) // no scroll amt specified
ret = FALSE;
if( Scroll >= lpVLB->DisplayStrings ) // scroll less than #
ret = FALSE; // of displayed strings
else
scroll = Scroll;
}
if( ret == FALSE )
{
lpVLB->ScrollWindow = FALSE;
GlobalUnlock( lpVLB->hDisplayBuffer );
GlobalUnlock( lpVLB->hStringIds );
GlobalUnlock( hVLB );
return( FALSE );
}
// pointer to strings that will still be displayed
lpGoodStrings = lpString + ( (lpVLB->DisplayChars + 1) * scroll );
// number of strings that will still be displayed
nGoodStrings = ( lpVLB->DisplayStrings - scroll );
// adjust strings that will still be displayed and get new strings
if( wParam == SB_LINEUP || wParam == SB_PAGEUP )
{
lpVLB->FirstDisplayString -= scroll;
// push good strings & StringIds down in their buffers
lmemmove( lpGoodStrings, lpString,
nGoodStrings * (lpVLB->DisplayChars + 1) );
lmemmove( lpStringIds + scroll, lpStringIds,
nGoodStrings * sizeof( LONG ) );
// move Display string pointer to last string to get
lpString += ( scroll - 1 ) * (lpVLB->DisplayChars + 1);
// get the previous scroll number of strings
for( x = 0; x < scroll; x++ )
{
// get the StringId of the last string read
l = lpStringIds[ scroll - x ];
if( VLB_CALLBACK( lpVLB->ListBoxId, VCB_PREV,
&l, StringBuffer ) )
{
StringBuffer[ lpVLB->DisplayChars ] = 0;// Null Terminate
lstrcpy( lpString, StringBuffer ); // copy buf to str
Rpad( lpString, lpVLB->DisplayChars ); // pad with spaces
lpString -= lpVLB->DisplayChars + 1; // go to next str
lpStringIds[ ( scroll - x ) - 1 ] = l; // save StringId
}
else
break;
}
}
else // if( wParam == SB_LINEDOWN || wParam == SB_PAGEDOWN )
{
lpVLB->FirstDisplayString += scroll;
// move good strings & StringIds to the beginning of their bufs
lmemmove( lpString, lpGoodStrings,
nGoodStrings * (lpVLB->DisplayChars + 1) );
lmemmove( lpStringIds, lpStringIds + scroll,
nGoodStrings * sizeof( LONG ) );
// move Display string pointer to first string to get
lpString += nGoodStrings * (lpVLB->DisplayChars + 1);
// get the next scroll number of strings
for( x = 0; x < scroll; x++ )
{
// get the StringId of the last string read
l = lpStringIds[ ( nGoodStrings + x ) - 1 ];
if( VLB_CALLBACK( lpVLB->ListBoxId, VCB_NEXT,
&l, StringBuffer ) )
{
StringBuffer[ lpVLB->DisplayChars ] = 0;// Null Terminate
lstrcpy( lpString, StringBuffer ); // copy buf to str
Rpad( lpString, lpVLB->DisplayChars ); // pad with spaces
lpString += lpVLB->DisplayChars + 1; // go to next str
lpStringIds[ nGoodStrings + x ] = l; // save StringId
}
else
break;
}
}
InvalidateRect( hCtl, NULL, TRUE ); // Force WM_PAINT message
// set new scroll bar thumb postion
SetScrollPos( hCtl, SB_VERT, (int)lpVLB->FirstDisplayString,TRUE);
GlobalUnlock( lpVLB->hDisplayBuffer );
GlobalUnlock( lpVLB->hStringIds );
GlobalUnlock( hVLB );
return( TRUE );
}
//*******************************************************************
VOID FAR PASCAL SetSelectedString( HWND hCtl, WORD wParam,
LPVLB lpVLB )
{
LONG FAR *lpStringIds;
LONG FAR *lpSelectedStringId;
lpStringIds = (LONG FAR *)GlobalLock( lpVLB->hStringIds );
if( lpVLB->MultiSelection )
{
LONG FAR *lpSelectedStringIds;
if( ! HIBYTE( GetKeyState( VK_SHIFT ) ) )
lpVLB->TotalSelectedStrings = 0;
else
{
if(lpVLB->TotalSelectedStrings == lpVLB->MaxSelectedStrings)
{
lpVLB->MaxSelectedStrings += lpVLB->DisplayStrings;
if( ! ( lpVLB->hSelectedStringIds =
GlobalReAlloc( lpVLB->hSelectedStringIds,
lpVLB->MaxSelectedStrings * sizeof( LONG ), GHND ) ) )
{
lpVLB->MaxSelectedStrings -= lpVLB->DisplayStrings;
SendMessage( GetParent( hCtl ), WM_COMMAND,
lpVLB->ListBoxId, MAKELONG( hCtl, VLBN_ERRSPACE ) );
return;
}
}
}
lpSelectedStringIds = (LONG FAR *)
GlobalLock( lpVLB->hSelectedStringIds );
lpSelectedStringId =
lpSelectedStringIds + lpVLB->TotalSelectedStrings++;
}
else
{
lpVLB->TotalSelectedStrings = 1;
lpSelectedStringId = &lpVLB->SelectedStringId;
}
switch( wParam )
{
case NULL: // mouse left button click
case ' ': // space bar select focus string
case VK_DOWN:
case VK_UP:
*lpSelectedStringId =
lpStringIds[lpVLB->FocusString - lpVLB->FirstDisplayString];
break;
case VK_NEXT:
case VK_END:
*lpSelectedStringId = lpStringIds[lpVLB->DisplayStrings-1];
break;
case VK_PRIOR:
case VK_HOME:
*lpSelectedStringId = lpStringIds[0];
break;
}
SendMessage( GetParent( hCtl ), WM_COMMAND, lpVLB->ListBoxId,
MAKELONG( hCtl, VLBN_SELCHANGE ) );
if( lpVLB->MultiSelection )
GlobalUnlock( lpVLB->hSelectedStringIds );
GlobalUnlock( lpVLB->hStringIds );
}
//*******************************************************************
VOID FAR PASCAL SetFocusString( WORD wParam, LPVLB lpVLB )
{
switch( wParam )
{
case VK_DOWN:
case VK_UP:
if( lpVLB->FocusString < lpVLB->FirstDisplayString )
lpVLB->FocusString = lpVLB->FirstDisplayString;
else if( lpVLB->FocusString >
lpVLB->FirstDisplayString +lpVLB->DisplayStrings - 1 )
lpVLB->FocusString =
lpVLB->FirstDisplayString + lpVLB->DisplayStrings - 1;
else
{
if( wParam == VK_DOWN )
{
if( lpVLB->FocusString < lpVLB->TotalStrings - 1 )
lpVLB->FocusString++;
}
else
if( lpVLB->FocusString )
lpVLB->FocusString--;
}
break;
case VK_NEXT:
lpVLB->FocusString =
lpVLB->FirstDisplayString + lpVLB->DisplayStrings - 1;
break;
case VK_PRIOR:
lpVLB->FocusString = lpVLB->FirstDisplayString;
break;
case VK_HOME:
lpVLB->FocusString = 0;
break;
case VK_END:
lpVLB->FocusString = lpVLB->TotalStrings - 1;
break;
}
}
//*******************************************************************
VOID FAR PASCAL PaintVLB( HWND hCtl, LPVLB lpVLB )
{
int x, y, first, last;
HDC hDC;
PAINTSTRUCT ps;
LPSTR lpString;
RECT Rect;
LONG FAR * lpStringIds;
// let's get the display string buffer and each string's Id
lpString = (LPSTR)GlobalLock( lpVLB->hDisplayBuffer );
lpStringIds = (LONG FAR *)GlobalLock( lpVLB->hStringIds );
hDC = BeginPaint( hCtl, &ps );
GetVLBColors( hCtl, hDC );
first = 0;
last = lpVLB->DisplayStrings - 1;
for( x = first, y = 1; x <= last; x++, y += lpVLB->CharHeight )
{
if( lpStringIds[x] >= 0 )
{
TextOut ( hDC, 1, y, lpString, lpVLB->DisplayChars );
lpString += lpVLB->DisplayChars + 1;
}
else
{
lmemset( lpString, ' ', lpVLB->DisplayChars );
TextOut ( hDC, 1, y, lpString, lpVLB->DisplayChars );
}
}
EndPaint( hCtl, &ps );
if( lpVLB->TotalSelectedStrings )
InvertSelectedStrings( hCtl, lpVLB, -1 );
if( hCtl == GetFocus() )
FrameFocusString( hCtl, lpVLB, TRUE );
lpVLB->ScrollWindow = FALSE;
GlobalUnlock( lpVLB->hDisplayBuffer );
GlobalUnlock( lpVLB->hStringIds );
}
//*******************************************************************
VOID FAR PASCAL GetVLBColors( HWND hCtl, HANDLE hDC )
{
HANDLE hBrush;
SetBkColor( hDC, GetSysColor( COLOR_WINDOW ) );
SetTextColor( hDC, GetSysColor( COLOR_WINDOWTEXT ) );
if( hBrush = (HANDLE)SendMessage( GetParent( hCtl ), WM_CTLCOLOR,
hDC, MAKELONG( hCtl, CTLCOLOR_LISTBOX ) ) )
SelectObject( hDC, hBrush );
}
//*** END OF VLB.C **************************************************