home *** CD-ROM | disk | FTP | other *** search
/* ** GadTools layout toolkit ** ** Copyright © 1993-1996 by Olaf `Olsen' Barthel ** Freely distributable. ** ** :ts=4 */ #ifndef _GTLAYOUT_GLOBAL_H #include "gtlayout_global.h" #endif STATIC LONG __stdargs DefaultDispFunc(struct Gadget *gad,LONG value) { return(value); } /*****************************************************************************/ VOID LTP_LevelWidth(LayoutHandle *handle,STRPTR levelFormat,DISPFUNC dispFunc,LONG min,LONG max,LONG *maxWidth,LONG *maxLen,BOOL fullCheck) { UBYTE buffer[80]; LONG localMaxWidth; LONG localMaxLen; LONG len; localMaxWidth = 0; localMaxLen = 0; if(handle) { if(!dispFunc) dispFunc = (DISPFUNC)DefaultDispFunc; if(!levelFormat) { if(LocaleBase && LocaleBase->lb_SysPatches) levelFormat = "%lD"; else levelFormat = "%ld"; } if(fullCheck) { LONG i; for(i = min ; i <= max ; i++) { SPrintf(buffer,levelFormat,(LONG)(*dispFunc)(NULL,i)); len = strlen(buffer); if(len > localMaxLen) localMaxLen = len; len = TextLength(&handle->RPort,buffer,len); if(len > localMaxWidth) localMaxWidth = len; } } else { SPrintf(buffer,levelFormat,(LONG)(*dispFunc)(NULL,min)); len = strlen(buffer); if(len > localMaxLen) localMaxLen = len; len = TextLength(&handle->RPort,buffer,len); if(len > localMaxWidth) localMaxWidth = len; SPrintf(buffer,levelFormat,(LONG)(*dispFunc)(NULL,max)); len = strlen(buffer); if(len > localMaxLen) localMaxLen = len; len = TextLength(&handle->RPort,buffer,len); if(len > localMaxWidth) localMaxWidth = len; } } if(maxLen) *maxLen = localMaxLen; if(maxWidth) *maxWidth = localMaxWidth + handle->GlyphWidth; } /*****************************************************************************/ /****** gtlayout.library/LT_LevelWidth ****************************************** * * NAME * LT_LevelWidth -- Determine the maximum width of a SLIDER_KIND * level string. * * SYNOPSIS * Index = LT_LevelWidth(Handle,FormatString,DispFunc,Min,Max,MaxWidth, * D0 A0 A1 A2 D0 D1 A3 * * MaxLen,FullCheck); * A5 D2 * * LONG LT_LevelWidth(LayoutHandle *,STRPTR, * LONG (*)(struct Gadget *,WORD),LONG,LONG,LONG *, * LONG *,BOOL); * * FUNCTION * In order to make room for the level text displayed by a * SLIDER_KIND object one needs to know how much space the * longest level string will occupy. Otherwise, the level * text may overwrite the gadget label text or the slider * container. This routine will rattle through all possible * slider settings (as given via the Min and the Max * level values) and determine the longest label string * according to the font used. * * INPUTS * Handle - Pointer to a LayoutHandle structure, as returned by * a call to LT_CreateHandleTags(). * * FormatString - The sprintf() style formatting string to be used * to format the slider level settings into text. * This is the same string you would pass in via * the GTSL_LevelFormat tag when creating the * slider object. * Default: "%lD" for systems which have locale.library * installed, "%ld" otherwise. * * DispFunc - A pointer to the function to filter the slider level * values. The result of this function will then be * used to format a string into the slider level text. * This is the same parameter you would pass in via * the GTSL_DispFunc tag when creating the slider * object. * * NOTE: the routine will be called with a NULL Gadget * parameter, make sure your code will handle * this nicely. * * Default: no display function * * Min - The smallest value the slider can be set to. This is * same value you would pass in via GTSL_Min when creating * the slider object. * * Max - The largest value the slider can be set to. This is * same value you would pass in via GTSL_Max when creating * the slider object. * * MaxWidth - Pointer to a place to store the width of the * longest level string in pixels. If you pass * in NULL instead of the address of a variable * no harm will be done. * * MaxLen - Pointer to a place to store the length of the * longest level string in characters. If you pass * in NULL instead of the address of a variable * no harm will be done. * * FullCheck - TRUE will cause the code to rattle through all * possible slider settings, starting from the * minimum value, ending at the maximum value. * While this may be a good idea for a display * function to map slider levels to text strings * of varying length it might be a problem when * it comes to display a range of numbers from * 1 to 40,000: the code will loop through * 40,000 iterations trying to find the longest * string. * * FALSE will cause the code to calculate the * longest level string based only on the * minimum and the maximum value to check. * While this is certainly a good a idea when * it comes to display a range of numbers from * 1 to 40,000 as only two values will be * checked the code may fail to produce * accurate results for sliders using display * functions mapping slider levels to strings. * * RESULT * Index - The slider level which gives the longest * level string. * * NOTES * Some compilers have trouble passing parameters in A5. In such * a case it is recommended to use gtlayout.library/LT_NewLevelWidth * instead. * * SEE ALSO * gtlayout.library/LT_NewLevelWidth * ****************************************************************************** * */ VOID LIBENT LT_LevelWidth(REG(a0) LayoutHandle *handle,REG(a1) STRPTR levelFormat,REG(a2) DISPFUNC dispFunc,REG(d0) LONG min,REG(d1) LONG max,REG(a3) LONG *maxWidth,REG(a5) LONG *maxLen,REG(d2) BOOL fullCheck) { LTP_LevelWidth(handle,levelFormat,dispFunc,min,max,maxWidth,maxLen,fullCheck); } /****** gtlayout.library/LT_NewLevelWidth ****************************************** * * NAME * LT_NewLevelWidth -- Determine the maximum width of a SLIDER_KIND * level string. (V14) * * SYNOPSIS * Index = LT_LevelWidth(Handle,FormatString,DispFunc,Min,Max,MaxWidth, * D0 A0 A1 A2 D0 D1 A3 * * MaxLen,FullCheck); * D3 D2 * * LONG LT_LevelWidth(LayoutHandle *,STRPTR, * LONG (*)(struct Gadget *,WORD),LONG,LONG,LONG *, * LONG *,BOOL); * * FUNCTION * In order to make room for the level text displayed by a * SLIDER_KIND object one needs to know how much space the * longest level string will occupy. Otherwise, the level * text may overwrite the gadget label text or the slider * container. This routine will rattle through all possible * slider settings (as given via the Min and the Max * level values) and determine the longest label string * according to the font used. * * INPUTS * Handle - Pointer to a LayoutHandle structure, as returned by * a call to LT_CreateHandleTags(). * * FormatString - The sprintf() style formatting string to be used * to format the slider level settings into text. * This is the same string you would pass in via * the GTSL_LevelFormat tag when creating the * slider object. * Default: "%lD" for systems which have locale.library * installed, "%ld" otherwise. * * DispFunc - A pointer to the function to filter the slider level * values. The result of this function will then be * used to format a string into the slider level text. * This is the same parameter you would pass in via * the GTSL_DispFunc tag when creating the slider * object. * * NOTE: the routine will be called with a NULL Gadget * parameter, make sure your code will handle * this nicely. * * Default: no display function * * Min - The smallest value the slider can be set to. This is * same value you would pass in via GTSL_Min when creating * the slider object. * * Max - The largest value the slider can be set to. This is * same value you would pass in via GTSL_Max when creating * the slider object. * * MaxWidth - Pointer to a place to store the width of the * longest level string in pixels. If you pass * in NULL instead of the address of a variable * no harm will be done. * * MaxLen - Pointer to a place to store the length of the * longest level string in characters. If you pass * in NULL instead of the address of a variable * no harm will be done. * * FullCheck - TRUE will cause the code to rattle through all * possible slider settings, starting from the * minimum value, ending at the maximum value. * While this may be a good idea for a display * function to map slider levels to text strings * of varying length it might be a problem when * it comes to display a range of numbers from * 1 to 40,000: the code will loop through * 40,000 iterations trying to find the longest * string. * * FALSE will cause the code to calculate the * longest level string based only on the * minimum and the maximum value to check. * While this is certainly a good a idea when * it comes to display a range of numbers from * 1 to 40,000 as only two values will be * checked the code may fail to produce * accurate results for sliders using display * functions mapping slider levels to strings. * * RESULT * Index - The slider level which gives the longest * level string. * * NOTES * This function does exactly what gtlayout.library/LT_LevelWidth * does, but uses a slightly different register ordering. Namely, * the MaxLen pointer is passed in D3 instead of A5. * * SEE ALSO * gtlayout.library/LT_LevelWidth * ****************************************************************************** * */ VOID LIBENT LT_NewLevelWidth(REG(a0) LayoutHandle *handle,REG(a1) STRPTR levelFormat,REG(a2) DISPFUNC dispFunc,REG(d0) LONG min,REG(d1) LONG max,REG(a3) LONG *maxWidth,REG(d3) LONG *maxLen,REG(d2) BOOL fullCheck) { LTP_LevelWidth(handle,levelFormat,dispFunc,min,max,maxWidth,maxLen,fullCheck); } 
