/*

    File:       SVAEDelete.c

    Contains:   

    Written by: Original version by Jon Lansdell and Nigel Humphreys.

                3.1 updates by Greg Sutton.

    Copyright:  Copyright © 1995-1999 by Apple Computer, Inc., All Rights Reserved.

                You may incorporate this Apple sample source code into your program(s) without

                restriction. This Apple sample source code has been provided "AS IS" and the

                responsibility for its operation is yours. You are not permitted to redistribute

                this Apple sample source code as "Apple sample source code" after having made

                changes. If you're going to re-distribute the source, we require that you make

                it clear in the source that the code was descended from Apple sample source

                code, but that you've made changes.

    Change History (most recent first):

                7/20/1999   Karl Groethe    Updated for Metrowerks Codewarror Pro 2.1

*/

#include "SVAEDelete.h"

#include "SVEditAEUtils.h"

#include "SVEditWindow.h"       // for DPtrFromWindowPtr()

#include "SVAESelect.h"

#pragma segment AppleEvent

// -----------------------------------------------------------------------

//      Name:       DoDelete

//      Purpose:    Performs a delete text operation on the direct object,

//                  if there is no direct object then delete the current

//                  selection

// -----------------------------------------------------------------------

pascal OSErr    DoDelete(const AppleEvent *theAppleEvent, AppleEvent *reply, long refcon)

{

#pragma unused (reply, refcon)

    AEDesc      directObj = {typeNull, NULL};

    TextToken   aTextToken;

    short       ignore;

    OSErr       err;

    err = AEGetParamDesc(theAppleEvent, keyDirectObject, typeWildCard, &directObj);

    if (noErr != err) goto done;

    if (directObj.descriptorType != typeNull)

        err = DeleteDesc(&directObj);

    else

    {           // Just delete the selection of the front window

        err = GetWindowSelection(FrontWindow(), &aTextToken, &ignore);

        if (noErr != err) goto done;

        err = DeleteTextToken(&aTextToken);

    }

done:   

    if (directObj.dataHandle)

        AEDisposeDesc(&directObj);

    return(err);

} // DoDeleteEdit

OSErr   DeleteTextToken(TextToken* theToken)

{

    WindowPtr       aWindow;

    DPtr            docPtr;

    TextToken       oldSelection;

    short           oldLength,

                    insertLength;               // Should be zero

    OSErr           err;

    if (! theToken->tokenLength)        // Pointless deleting nothing

        return(noErr);

    aWindow = theToken->tokenWindow;

    docPtr = DPtrFromWindowPtr(theToken->tokenWindow);

    if (! aWindow || ! docPtr)

        return(errAENoSuchObject);

    err = GetWindowSelection(aWindow, &oldSelection, &oldLength);

    if (noErr != err) goto done;

    err = SelectTextToken(theToken);

    if (noErr != err) goto done;

    TEDelete(docPtr->theText);  

    docPtr->dirty = true;

    AdjustScrollbars(docPtr, false);

    DrawPageExtras(docPtr);

    err = UpdateSelectionToken(theToken, &oldSelection, oldLength, &insertLength);

done:

    return(err);

}

OSErr   DeleteTextDesc(AEDesc* textDesc)

{

    TextToken       aTextToken;

    Size            actualSize;

    OSErr           err;

    if (typeMyText != textDesc->descriptorType)

        return(errAETypeError);

    GetRawDataFromDescriptor(textDesc, (Ptr)&aTextToken, sizeof(aTextToken), &actualSize);

    err = DeleteTextToken(&aTextToken);

    return(err);

}

OSErr   DeleteDesc(AEDesc* aDesc)

{

    AEDesc      deleteDesc = {typeNull, NULL},

                textDesc = {typeNull, NULL},

                itemDesc = {typeNull, NULL};

    long        index;

    DescType    theAEKeyword;

    OSErr       err;

    if (typeObjectSpecifier == aDesc->descriptorType)

        err = AEResolve(aDesc, kAEIDoMinimum, &deleteDesc);

    else

        err = AEDuplicateDesc(aDesc, &deleteDesc);

    if (noErr != err) goto done;

    switch (deleteDesc.descriptorType)

    {

        case typeAEList:

            err = AECountItems(&deleteDesc, &index);

            if (noErr != err) goto done;

            for (; index > 0; index--)          // Do backwards or offsets will screw up.

            {                                   // Perhaps we should sort this list first.

                                                // Can a query double up on offsets?

                err = AEGetNthDesc(&deleteDesc, index, typeWildCard, &theAEKeyword, &itemDesc);

                if (noErr != err) goto done;

                err = DeleteDesc(&itemDesc);    // Call recursively

                if (noErr != err) goto done;

                if (itemDesc.dataHandle)

                    AEDisposeDesc(&itemDesc);

            }

            break;

        default:

            err = AECoerceDesc(&deleteDesc, typeMyText, &textDesc);

            if (noErr != err) goto done;

            err = DeleteTextDesc(&textDesc);

    }

done:

    if (deleteDesc.dataHandle)

        AEDisposeDesc(&deleteDesc);

    if (textDesc.dataHandle)

        AEDisposeDesc(&textDesc);

    if (itemDesc.dataHandle)

        AEDisposeDesc(&itemDesc);

    return(err);

}