433 lines
12 KiB
C
433 lines
12 KiB
C
/*
|
|
* CDE - Common Desktop Environment
|
|
*
|
|
* Copyright (c) 1993-2012, The Open Group. All rights reserved.
|
|
*
|
|
* These libraries and programs are free software; you can
|
|
* redistribute them and/or modify them under the terms of the GNU
|
|
* Lesser General Public License as published by the Free Software
|
|
* Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
*
|
|
* These libraries and programs are distributed in the hope that
|
|
* they will be useful, but WITHOUT ANY WARRANTY; without even the
|
|
* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
|
|
* PURPOSE. See the GNU Lesser General Public License for more
|
|
* details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with these libraries and programs; if not, write
|
|
* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
|
|
* Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
/* $XConsortium: EditCalls.c /main/4 1996/03/26 19:53:27 drk $
|
|
**********************************<+>*************************************
|
|
***************************************************************************
|
|
**
|
|
** File: EditCalls.c
|
|
**
|
|
** Project: DtEditor widget interface for text edit services.
|
|
**
|
|
** Description: Contains the public functions related to undo,
|
|
** cut, copy, paste, and the internal Modify/Verify callback.
|
|
** -----------
|
|
**
|
|
*******************************************************************
|
|
* (c) Copyright 1996 Digital Equipment Corporation.
|
|
* (c) Copyright 1993, 1994, 1996 Hewlett-Packard Company.
|
|
* (c) Copyright 1993, 1994, 1996 International Business Machines Corp.
|
|
* (c) Copyright 1993, 1994, 1996 Sun Microsystems, Inc.
|
|
* (c) Copyright 1996 Novell, Inc.
|
|
* (c) Copyright 1996 FUJITSU LIMITED.
|
|
* (c) Copyright 1996 Hitachi.
|
|
* (c) Copyright 1993, 1994 Unix System Labs, Inc., a subsidiary of Novell, Inc.
|
|
********************************************************************
|
|
**
|
|
**
|
|
**************************************************************************
|
|
**********************************<+>*************************************/
|
|
|
|
#include "EditorP.h"
|
|
#include "DtWidgetI.h"
|
|
#include <Xm/XmPrivate.h> /* _XmStringSourceGetString */
|
|
|
|
void
|
|
_DtEditorResetUndo(
|
|
DtEditorWidget editor)
|
|
{
|
|
|
|
/*
|
|
* Reset deletion & insertion contexts.
|
|
*/
|
|
|
|
if( (M_deletedText(editor) != (char *)NULL) &&
|
|
(strlen(M_deletedText(editor)) != 0) )
|
|
{
|
|
XtFree(M_deletedText(editor));
|
|
M_deletedText(editor) = (char *) NULL;
|
|
}
|
|
|
|
M_deletionStart(editor) = NO_DELETION_IN_PROGRESS;
|
|
M_insertStart(editor) = 0;
|
|
M_insertionLength(editor) = 0;
|
|
|
|
} /* end _DtEditorResetUndo */
|
|
|
|
|
|
Boolean
|
|
DtEditorUndoEdit(
|
|
Widget widget)
|
|
{
|
|
DtEditorWidget pPriv = (DtEditorWidget) widget;
|
|
_DtWidgetToAppContext(widget);
|
|
_DtAppLock(app);
|
|
|
|
/*
|
|
* Remove any insertion, and then put back any previous deletion.
|
|
* The tricky part is that removing the insertion looks like a deletion
|
|
* and the modifyVerify callback will save in the undo buffer, wiping
|
|
* out any previous deletion (before we can reinsert it). So we have to
|
|
* save the previous deletion before undoing the insertion so we can
|
|
* reinsert it. Make sense?
|
|
*/
|
|
if(M_insertionLength(pPriv) != 0)
|
|
{
|
|
/*
|
|
* There is an insertion so remove everything we just inserted
|
|
*/
|
|
if( (M_deletedText(pPriv) != (char *)NULL) &&
|
|
(strlen(M_deletedText(pPriv)) != 0) )
|
|
{
|
|
/*
|
|
* If there is a current deletion, save it before removing the
|
|
* insertion so we can put it back (i.e. undo the deletion).
|
|
*/
|
|
int oldDeleteStart = M_deletionStart(pPriv);
|
|
char *oldDeletion = M_deletedText(pPriv);
|
|
M_deletedText(pPriv) = (char *)NULL;
|
|
|
|
/*
|
|
* 1. Delete the last insertion.
|
|
*/
|
|
XmTextSetSelection(M_text(pPriv), M_insertStart(pPriv),
|
|
M_insertStart(pPriv) + M_insertionLength(pPriv),
|
|
CurrentTime);
|
|
|
|
M_insertionLength(pPriv)=0;
|
|
XmTextRemove(M_text(pPriv));
|
|
|
|
/*
|
|
* 2. Put back the previous deletion.
|
|
*/
|
|
XmTextInsert(M_text(pPriv), oldDeleteStart, oldDeletion);
|
|
|
|
XtFree(oldDeletion);
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* There is no deletion, so we just have to remove the
|
|
* insertion.
|
|
*/
|
|
XmTextSetSelection(M_text(pPriv), M_insertStart(pPriv),
|
|
M_insertStart(pPriv) + M_insertionLength(pPriv),
|
|
CurrentTime);
|
|
M_insertionLength(pPriv) = 0;
|
|
XmTextRemove(M_text(pPriv));
|
|
}
|
|
}
|
|
else if(M_deletedText(pPriv) != (char *)NULL)
|
|
{
|
|
/*
|
|
* Nothing has been inserted so just undo the previous deletion.
|
|
*/
|
|
|
|
char *oldDeletion = M_deletedText(pPriv);
|
|
M_deletedText(pPriv) = (char *)NULL;
|
|
|
|
XmTextInsert(M_text(pPriv), M_deletionStart(pPriv), oldDeletion);
|
|
|
|
XtFree(oldDeletion);
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* There is no insertion to remove or deletion to put back in
|
|
* (i.e. nothing to undo) so return False.
|
|
*/
|
|
_DtAppUnlock(app);
|
|
return(False);
|
|
}
|
|
|
|
_DtAppUnlock(app);
|
|
return(True);
|
|
|
|
} /* end DtEditorUndoEdit */
|
|
|
|
Boolean
|
|
DtEditorCutToClipboard(
|
|
Widget widget)
|
|
{
|
|
|
|
DtEditorWidget editor = (DtEditorWidget) widget;
|
|
XEvent *event;
|
|
_DtWidgetToAppContext(widget);
|
|
_DtAppLock(app);
|
|
|
|
/*
|
|
* Create an event with a correct timestamp
|
|
*/
|
|
event = (XEvent *) XtMalloc( sizeof(XEvent) );
|
|
event->xkey.time = XtLastTimestampProcessed( M_display(editor) );
|
|
|
|
/*
|
|
* Call routine to cut selection to clipboard
|
|
*/
|
|
XtCallActionProc(M_text(editor), "cut-clipboard", event, NULL, 0);
|
|
|
|
XtFree( (char *) event );
|
|
|
|
_DtAppUnlock(app);
|
|
return(True);
|
|
|
|
}
|
|
|
|
Boolean
|
|
DtEditorCopyToClipboard(
|
|
Widget widget)
|
|
{
|
|
DtEditorWidget editor = (DtEditorWidget) widget;
|
|
XEvent *event;
|
|
_DtWidgetToAppContext(widget);
|
|
_DtAppLock(app);
|
|
|
|
/*
|
|
* Create an event with a correct timestamp
|
|
*/
|
|
event = (XEvent *) XtMalloc( sizeof(XEvent) );
|
|
event->xkey.time = XtLastTimestampProcessed( M_display(editor) );
|
|
|
|
/*
|
|
* Call routine to copy selection to clipboard
|
|
*/
|
|
XtCallActionProc(M_text(editor), "copy-clipboard", event, NULL, 0);
|
|
|
|
XtFree( (char *) event );
|
|
|
|
_DtAppUnlock(app);
|
|
return(True);
|
|
}
|
|
|
|
Boolean
|
|
DtEditorPasteFromClipboard(
|
|
Widget widget)
|
|
{
|
|
DtEditorWidget editor = (DtEditorWidget) widget;
|
|
XEvent *event;
|
|
_DtWidgetToAppContext(widget);
|
|
_DtAppLock(app);
|
|
|
|
/*
|
|
* Create an event with a correct timestamp
|
|
*/
|
|
event = (XEvent *) XtMalloc( sizeof(XEvent) );
|
|
event->xkey.time = XtLastTimestampProcessed( M_display(editor) );
|
|
|
|
/*
|
|
* Call routine to paste contents of clipboard at insertion cursor
|
|
*/
|
|
XtCallActionProc(M_text(editor), "paste-clipboard", event, NULL, 0);
|
|
|
|
XtFree( (char *) event );
|
|
|
|
_DtAppUnlock(app);
|
|
return(True);
|
|
|
|
}
|
|
|
|
|
|
/*
|
|
* SetUndoDeletionState maintains the contents of editStuff.undo related
|
|
* to deletion (the deleted text & its original starting position).
|
|
*
|
|
* SetUndoDeletionState can also reset/invalidate the undo contents related to
|
|
* insertion if it detects a "new" deletion. The idea is to treat consecutive
|
|
* deletions as atomic from the viewpoint of undo. A delete is
|
|
* non-consecutive if it's start or end position is not coincidental with
|
|
* the last deletion. One set of consecutive insertions is allowed following
|
|
* deletions, and will be undone by the DtEditorUndo(). Non-consecutive
|
|
* insertions will reset/invalidate the deletion undo buffer.
|
|
*/
|
|
static void
|
|
SetUndoDeletionState(
|
|
DtEditorWidget pPriv,
|
|
XmTextVerifyCallbackStruct *cb)
|
|
{
|
|
char *pDeletedText;
|
|
|
|
/*
|
|
* Get the text which will be deleted from the text widget.
|
|
*/
|
|
pDeletedText = (char *)_XmStringSourceGetString(
|
|
(XmTextWidget) M_text(pPriv),
|
|
cb->startPos,
|
|
cb->endPos,
|
|
False);
|
|
|
|
if( M_deletedText(pPriv) != (char *)NULL &&
|
|
M_insertionLength(pPriv) == 0 &&
|
|
(cb->startPos == M_deletionStart(pPriv) ||
|
|
cb->endPos == M_deletionStart(pPriv))
|
|
)
|
|
{
|
|
/*
|
|
* Continuation of the current deletion. For a continuation, there
|
|
* must have been no intervening insertions, and we must be deleting
|
|
* from the same point, either forward or backward.
|
|
*/
|
|
char *oldUndo = M_deletedText(pPriv);
|
|
M_deletedText(pPriv) = XtMalloc( strlen(M_deletedText(pPriv)) +
|
|
strlen(pDeletedText) + 1 );
|
|
|
|
if(cb->startPos == M_deletionStart(pPriv)) {
|
|
/*
|
|
* deleting forward - deletionStart remains the same.
|
|
*/
|
|
strcpy(M_deletedText(pPriv), oldUndo);
|
|
strcat(M_deletedText(pPriv), pDeletedText);
|
|
}
|
|
else {
|
|
/*
|
|
* deleting backward (e.g. Backspace)
|
|
*/
|
|
strcpy(M_deletedText(pPriv), pDeletedText);
|
|
strcat(M_deletedText(pPriv), oldUndo);
|
|
M_deletionStart(pPriv) = cb->startPos;
|
|
}
|
|
XtFree(oldUndo);
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* Starting a new deletion context. Replace the old deletion
|
|
* context, and remove the insertion context.
|
|
*/
|
|
_DtEditorResetUndo( pPriv );
|
|
|
|
M_deletedText(pPriv) = XtMalloc(strlen(pDeletedText) + 1);
|
|
|
|
strcpy(M_deletedText(pPriv), pDeletedText);
|
|
M_deletionStart(pPriv) = cb->startPos;
|
|
M_insertStart(pPriv) = cb->startPos;
|
|
M_insertionLength(pPriv) = 0;
|
|
}
|
|
|
|
XtFree( pDeletedText );
|
|
} /* SetUndoDeletionState */
|
|
|
|
/*
|
|
* SetUndoInsertionState maintains the contents of editStuff.undo related
|
|
* to insertions (the number of characters inserted & the position of the
|
|
* first one).
|
|
*/
|
|
static void
|
|
SetUndoInsertionState(
|
|
DtEditorWidget pPriv,
|
|
XmTextVerifyCallbackStruct *cb)
|
|
{
|
|
if(M_insertionLength(pPriv) == 0) {
|
|
/*
|
|
* We've started a new deletion context, so reset the insertion
|
|
* context.
|
|
*/
|
|
M_insertStart(pPriv) = cb->startPos;
|
|
M_insertionLength(pPriv) = _DtEditor_CountCharacters(cb->text->ptr,
|
|
cb->text->length);
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* Determine if we're continuing the current insertion context
|
|
* or beginning a new one.
|
|
*/
|
|
if(cb->startPos == (M_insertStart(pPriv) + M_insertionLength(pPriv)))
|
|
M_insertionLength(pPriv) += _DtEditor_CountCharacters(
|
|
cb->text->ptr, cb->text->length);
|
|
else
|
|
{
|
|
/*
|
|
* We're starting a new insertion context, so invalidate any
|
|
* existing deletion context, and reset the insertion context.
|
|
*/
|
|
_DtEditorResetUndo( pPriv );
|
|
M_insertStart(pPriv) = cb->startPos;
|
|
M_insertionLength(pPriv) = _DtEditor_CountCharacters(
|
|
cb->text->ptr, cb->text->length);
|
|
}
|
|
}
|
|
} /* SetUndoInsertionState */
|
|
|
|
|
|
/************************************************************************
|
|
*
|
|
* _DtEditorModifyVerifyCB - The modify/verify callback
|
|
*
|
|
* The modify verify callback handles incoming data and the data which
|
|
* will be replaced. The replaced data is saved (for later undos).
|
|
*
|
|
* Parameters:
|
|
* widget - the text widget
|
|
* client_data - the edit area widget
|
|
* call_data - callback structure
|
|
*
|
|
************************************************************************/
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
_DtEditorModifyVerifyCB(
|
|
Widget w,
|
|
caddr_t client_data,
|
|
caddr_t call_data )
|
|
{
|
|
XmTextVerifyCallbackStruct * cb =
|
|
(XmTextVerifyCallbackStruct *) call_data;
|
|
DtEditorWidget editor = (DtEditorWidget) client_data;
|
|
|
|
/*
|
|
* Loading all new data so no need to set up the data for later undos
|
|
*/
|
|
if (M_loadingAllNewData(editor) == True)
|
|
{
|
|
_DtEditorResetUndo( editor );
|
|
M_unreadChanges(editor) = False;
|
|
M_loadingAllNewData(editor) = False;
|
|
}
|
|
else
|
|
{
|
|
|
|
/*
|
|
* Adding additional data, rather than replacing all of the contents.
|
|
*
|
|
* Mark that the contents have been modified since the last time the
|
|
* application requested a copy.
|
|
*/
|
|
M_unreadChanges(editor) = True;
|
|
|
|
/*
|
|
* First, account for any data which will be removed by the new data.
|
|
* If text is being deleted, then grab a copy for later undo's.
|
|
*/
|
|
if(cb->endPos > cb->startPos)
|
|
SetUndoDeletionState(editor, cb);
|
|
|
|
/*
|
|
* If text is being inserted, then change the undo insertion state.
|
|
*/
|
|
if(cb->text->length > 0)
|
|
SetUndoInsertionState(editor, cb);
|
|
|
|
}
|
|
|
|
} /* end ModifyVerifyCB */
|
|
|