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/*
WASTE Demo Project:
Macintosh Controls with Long Values
Copyright © 1993-1996 Marco Piovanelli
All Rights Reserved
C port by John C. Daub
*/
/***************************************************************************
This file is not subject to the O'Caml licence.
It is a slightly modified version of "LongControls.c" from
the WASTE Demo source (version 1.2).
***************************************************************************/
/* $Id$ */
#ifndef __CONTROLS__
#include <Controls.h>
#endif
#ifndef __FIXMATH__
#include <FixMath.h>
#endif
#ifndef __TOOLUTILS__
#include <ToolUtils.h>
#endif
#include "main.h" /* The change */
#define BSL(A, B) (((long) (A)) << (B)) /* is here */
// long control auxiliary record used for keeping long settings
// a handle to this record is stored in the reference field of the control record
struct LCAuxRec
{
long value; // long value
long min; // long min
long max; // long max
};
typedef struct LCAuxRec LCAuxRec, *LCAuxPtr, **LCAuxHandle;
OSErr LCAttach( ControlRef control )
{
Handle aux;
LCAuxPtr pAux;
/* allocate the auxiliary record that will hold long settings */
if ( ( aux = NewHandleClear( sizeof( LCAuxRec ) ) ) == nil )
{
return MemError( );
}
/* store a handle to the auxiliary record in the contrlRfCon field */
SetControlReference( control, (long) aux );
/* copy current control settings into the auxiliary record */
pAux = * (LCAuxHandle) aux;
pAux->value = GetControlValue( control );
pAux->min = GetControlMinimum( control );
pAux->max = GetControlMaximum( control );
return noErr;
}
void LCDetach( ControlRef control )
{
Handle aux;
if ( ( aux = (Handle) GetControlReference( control ) ) != nil )
{
SetControlReference( control, 0L );
DisposeHandle( aux );
}
}
void LCSetValue( ControlRef control, long value )
{
LCAuxPtr pAux;
short controlMin, controlMax, newControlValue;
pAux = * (LCAuxHandle) GetControlReference( control );
/* make sure value is in the range min...max */
if ( value < pAux->min )
{
value = pAux->min;
}
if ( value > pAux->max )
{
value = pAux->max;
}
/* save value in auxiliary record */
pAux->value = value;
/* calculate new thumb position */
controlMin = GetControlMinimum( control );
controlMax = GetControlMaximum( control );
newControlValue = controlMin + FixRound( FixMul ( FixDiv( value - pAux->min,
pAux->max - pAux->min), BSL(controlMax - controlMin, 16 )));
/* do nothing if the thumb position hasn't changed */
if ( newControlValue != GetControlValue(control) )
{
SetControlValue( control, newControlValue );
}
}
void LCSetMin( ControlRef control, long min )
{
LCAuxPtr pAux;
pAux = * (LCAuxHandle) GetControlReference( control );
/* make sure min is less than or equal to max */
if ( min > pAux->max )
{
min = pAux->max;
}
/* save min in auxiliary record */
pAux->min = min;
/* set control minimum to min or SHRT_MIN, whichever is greater */
SetControlMinimum( control, ( min >= SHRT_MIN ) ? min : SHRT_MIN );
/* reset value */
LCSetValue( control, pAux->value );
}
void LCSetMax( ControlRef control, long max )
{
LCAuxPtr pAux;
pAux = * (LCAuxHandle) GetControlReference( control );
/* make sure max is greater than or equal to min */
if ( max < pAux->min )
{
max = pAux->min;
}
/* save max in auxiliary record */
pAux->max = max;
/* set control maximum to max or SHRT_MAX, whichever is less */
SetControlMaximum( control, ( max <= SHRT_MAX ) ? max : SHRT_MAX );
/* reset value */
LCSetValue( control, pAux->value );
}
/* In each of these LCGetXXX() functions, there are 2 ways listed to do things. They are
both the same thing and perform the same stuff, just one is easier to read than the
other (IMHO). I asked Marco about it and he gave me the shorter code (what's commented
in each function) and gave me this explanation:
This version [the commented code] yields smaller and faster code
(try disassembling both versions if you wish), but some people may
find it somewhat harder to read.
I agree with Marco that his code is better overall, but in the interest of readabilty
(since this demo is a learning tool), I left my code in and put Marco's in commented
out. Pick whichever you'd like to use.
*/
long LCGetValue( ControlRef control )
{
LCAuxPtr pAux;
pAux = *((LCAuxHandle)GetControlReference( control ));
return pAux->value;
// this is Marco's code. Remember, this is a little harder to read, but overall
// yields tighter code.
// return (* (LCAuxHandle) GetControlReference(control)) -> value;
}
long LCGetMin( ControlRef control )
{
LCAuxPtr pAux;
pAux = *((LCAuxHandle)GetControlReference( control ));
return pAux->min;
// this is Marco's code. Remember, this is a little harder to read, but overall
// yields tighter code.
// return (* (LCAuxHandle)GetControlReference(control)) -> min;
}
long LCGetMax( ControlRef control )
{
LCAuxPtr pAux;
pAux = *((LCAuxHandle)GetControlReference( control ));
return pAux->max;
// this is Marco's code. Remember, this is a little harder to read, but overall
// yields tighter code.
// return (* (LCAuxHandle)GetControlReference(control)) -> max;
}
void LCSynch( ControlRef control )
{
LCAuxPtr pAux;
short controlMin, controlMax, controlValue;
controlMin = GetControlMinimum( control );
controlMax = GetControlMaximum( control );
controlValue = GetControlValue( control );
pAux = * (LCAuxHandle) GetControlReference( control );
/* calculate new long value */
pAux->value = pAux->min + FixMul( FixRatio ( controlValue - controlMin,
controlMax - controlMin), pAux->max - pAux->min );
}
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