Sweden-Number/dlls/riched20/row.c

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2005-03-05 12:19:14 +01:00
/*
* RichEdit - Operations on rows of text (rows are recreated during
* wrapping and are used for displaying the document, they don't keep any
* true document content; delete all rows, rewrap all paragraphs and
* you get them back).
*
* Copyright 2004 by Krzysztof Foltman
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "editor.h"
ME_DisplayItem *ME_FindRowStart(ME_Context *c, ME_DisplayItem *item,
int nRelPos) {
ME_DisplayItem *para = ME_GetParagraph(item);
ME_MustBeWrapped(c, para);
if(nRelPos>=0) { /* if this or preceding row */
while(nRelPos<=0) {
ME_DisplayItem *item2 = ME_FindItemBack(item, diStartRowOrParagraph);
if (item2->type == diParagraph)
{
if (item2->member.para.prev_para == NULL)
return item;
/* if skipping to the preceding paragraph, ensure it's wrapped */
ME_MustBeWrapped(c, item2->member.para.prev_para);
item = item2;
continue;
}
else if (item2->type == diStartRow)
{
nRelPos++;
if (nRelPos>0)
return item;
item = item2;
continue;
}
assert(0 == "bug in FindItemBack(item, diStartRowOrParagraph)");
item = item2;
}
return item;
}
while(nRelPos>0) { /* if one of the next rows */
ME_DisplayItem *item2 = ME_FindItemFwd(item, diStartRowOrParagraph);
if (!item2)
return item;
if (item2->type == diParagraph)
{
if (item2->member.para.next_para == NULL)
return item;
continue;
}
item = item2;
nRelPos--;
}
return item;
}
/* I'm sure these functions would simplify some code in caret ops etc,
* I just didn't remember them when I wrote that code
*/
ME_DisplayItem *ME_RowStart(ME_DisplayItem *item) {
return ME_FindItemBackOrHere(item, diStartRow);
}
ME_DisplayItem *ME_RowEnd(ME_DisplayItem *item) {
ME_DisplayItem *item2 = ME_FindItemFwd(item, diStartRowOrParagraphOrEnd);
if (!item2) return NULL;
return ME_FindItemBack(item, diRun);
}
ME_DisplayItem *
ME_FindRowWithNumber(ME_TextEditor *editor, int nRow)
{
ME_DisplayItem *item = ME_FindItemFwd(editor->pBuffer->pFirst, diParagraph);
int nCount = 0;
while (item && nCount + item->member.para.nRows <= nRow)
{
nCount += item->member.para.nRows;
item = ME_FindItemFwd(item, diParagraph);
}
if (!item)
return item;
for (item = ME_FindItemFwd(item, diStartRow); item && nCount < nRow; nCount++)
item = ME_FindItemFwd(item, diStartRow);
return item;
}
int
ME_RowNumberFromCharOfs(ME_TextEditor *editor, int nOfs)
{
ME_DisplayItem *item = editor->pBuffer->pFirst->next;
int nRow = 0;
while (item && item->member.para.next_para->member.para.nCharOfs <= nOfs)
{
nRow += item->member.para.nRows;
item = ME_FindItemFwd(item, diParagraph);
}
if (item)
{
ME_DisplayItem *next_para = item->member.para.next_para;
nOfs -= item->member.para.nCharOfs;
item = ME_FindItemFwd(item, diRun);
while ((item = ME_FindItemFwd(item, diStartRowOrParagraph)) != NULL)
{
if (item == next_para)
break;
item = ME_FindItemFwd(item, diRun);
if (item->member.run.nCharOfs > nOfs)
break;
nRow++;
}
}
return nRow;
}