Apple WWDC 1996/WWDC96_1996 (CD).toast/Technology Materials/QuickTime VR/MacOS/QuickDraw™ 3D 1.0.6F4 SDK/Samples/SampleCode/Tumbler and Podium/Tumbler_teutilities.c

Text File | 1995-11-13 | 4.2 KB | 171 lines | [TEXT/MPS ]

//
//
//        teutilities.c
//
//        Supplemental TextEdit utilities.
//
//
//        Author:        Nick Thompson & Pablo Fernicola, with thanks to the QuickDraw 3D team
//        Date:        Monday, February 3, 1992
//
//        Copyright © 1992-95 Apple Computer, Inc., All Rights Reserved
//
//

#include <Script.h>
#include "Tumbler_prototypes.h"

#include "Tumbler_teutilities.h"

//
//    TEICut is an intelligent version of TECut. If the selection is a range
//    of words, TEICut cuts the selection and removes a space from either the
//    beginning or end of the selection point when the result of cutting leaves
//    one too many spaces in a sentence. The resulting change in size of the
//    TextEdit record is returned.
//
//    NOTE: This function does not work properly in all situations. It may still
//        need some work.
//

short TEICut(TEHandle theTE)

{    OffsetTable        startOffsets, endOffsets;
    short            selStart, selEnd, characters;
    Handle            theScrap;

    if (!(characters = (**theTE).selStart - (**theTE).selEnd))
        return(0);

    FindWord(*((**theTE).hText), (**theTE).teLength, (**theTE).selStart, true,
                    0L, startOffsets);
    FindWord(*((**theTE).hText), (**theTE).teLength, (**theTE).selEnd, false,
                    0L, endOffsets);

    if ((startOffsets[0].offFirst == (**theTE).selStart) &&
        (endOffsets[0].offSecond  == (**theTE).selEnd)) {

        //
        //    Both the beginning and end of the current selection is on
        //    word boundaries.


        selStart = (**theTE).selStart;
        selEnd = (**theTE).selEnd;
        if ((*((**theTE).hText))[selStart - 1] == ' ') {
            TESetSelect(selStart - 1, selEnd, theTE);
            TECut(theTE);
            theScrap = TEScrapHandle();
            BlockMove((char *) (*theScrap) + 1, (*theScrap), TEGetScrapLength() - 1);
            TESetScrapLength(TEGetScrapLength() - 1);
            ZeroScrap();
            TEToScrap();
            characters--;
        } else if ((*((**theTE).hText))[selEnd] == ' ') {
            TESetSelect(selStart, selEnd + 1, theTE);
            TECut(theTE);
            TESetScrapLength(TEGetScrapLength() - 1);
            ZeroScrap();
            TEToScrap();
            characters--;
        } else {
            TECut(theTE);
        }
    } else {
        TECut(theTE);
    }
    return(characters);
}


//
//    TEIPaste is an intelligent version of TEPaste. When pasting into a sentence,
//    an extra space may be added to either the start or end of the insertion
//    to maintain readibility of the resulting sentence. Optionally, pointers
//    may be provided to spaceBefore and/or spaceAfter. These flags return
//    true if a space was inserted before or after the insertion respectively.
//
//    NOTE: This function does not always work properly. It still needs work.
//

short TEIPaste(TEHandle theTE, short *spaceBefore, short *spaceAfter)

{    OffsetTable        startOffsets, endOffsets;
    short            addSpaceAfter, characters;

    characters = (**theTE).selStart - (**theTE).selEnd;

    if (spaceBefore)
        *spaceBefore = false;
    if (spaceAfter)
        *spaceAfter  = false;

    FindWord(*((**theTE).hText), (**theTE).teLength, (**theTE).selStart, false,
                    0L, startOffsets);
    FindWord(*((**theTE).hText), (**theTE).teLength, (**theTE).selEnd, true,
                    0L, endOffsets);

    addSpaceAfter = ((endOffsets[0].offFirst == (**theTE).selEnd) &&
                     ((*((**theTE).hText))[(**theTE).selEnd] != ' '));

    if ((startOffsets[0].offSecond == (**theTE).selStart) &&
            ((*((**theTE).hText))[(**theTE).selStart - 1] != ' ')) {
        TEKey(' ', theTE);
        characters++;
        if (spaceBefore)
            *spaceBefore = true;
    }

    TEPaste(theTE);
    characters += TEGetScrapLength();

    if (addSpaceAfter) {
        TEKey(' ', theTE);
        characters++;
        if (spaceAfter)
            *spaceAfter = true;
    }
    return(characters);
}


//
//    TEIsFrontOfLine, given an offset and a TextEdit handle, returns true if
//    the given offset is at the beginning of a line start.
//

short TEIsFrontOfLine(short offset, TEHandle theTE)

{    short        line = 0;

    if ((**theTE).teLength == 0)
        return(true);

    if (offset >= (**theTE).teLength)
        return( (*((**theTE).hText))[(**theTE).teLength - 1] == 0x0d );

    while ((**theTE).lineStarts[line] < offset)
        line++;

    return( (**theTE).lineStarts[line] == offset );
}


//
//    TEGetLine, given an offset and a TextEdit handle, returns the line number
//    of the line that contains the offset.
//

short TEGetLine(short offset, TEHandle theTE)

{    short        line = 0;

    if (offset > (**theTE).teLength)
        return((**theTE).nLines);

    while ((**theTE).lineStarts[line] < offset)
        line++;

    return(line);
}