151 lines
4.3 KiB
C
151 lines
4.3 KiB
C
/*
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* RichEdit - Operations on rows of text (rows are recreated during
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* wrapping and are used for displaying the document, they don't keep any
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* true document content; delete all rows, rewrap all paragraphs and
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* you get them back).
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*
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* Copyright 2004 by Krzysztof Foltman
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "editor.h"
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ME_Row *row_next( ME_Row *row )
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{
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ME_DisplayItem *item;
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item = ME_FindItemFwd( row_get_di( row ), diStartRowOrParagraphOrEnd );
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if (!item || item->type != diStartRow) return NULL;
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return &item->member.row;
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}
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ME_Run *row_first_run( ME_Row *row )
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{
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ME_DisplayItem *item;
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item = ME_FindItemFwd( row_get_di( row ), diRunOrStartRow );
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assert( item->type == diRun );
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return &item->member.run;
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}
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ME_Run *row_next_run( ME_Row *row, ME_Run *run )
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{
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ME_DisplayItem *item;
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assert( row == &ME_FindItemBack( run_get_di( run ), diStartRow )->member.row );
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item = ME_FindItemFwd( run_get_di( run ), diRunOrStartRow );
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if (!item || item->type == diStartRow) return NULL;
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return &item->member.run;
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}
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ME_Row *row_from_cursor( ME_Cursor *cursor )
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{
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ME_DisplayItem *item;
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item = ME_FindItemBack( cursor->pRun, diStartRow );
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return &item->member.row;
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}
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void row_first_cursor( ME_Row *row, ME_Cursor *cursor )
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{
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ME_DisplayItem *item;
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item = ME_FindItemFwd( row_get_di( row ), diRun );
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cursor->pRun = item;
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cursor->pPara = para_get_di( cursor->pRun->member.run.para );
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cursor->nOffset = 0;
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}
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void row_end_cursor( ME_Row *row, ME_Cursor *cursor, BOOL include_eop )
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{
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ME_DisplayItem *item, *run;
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item = ME_FindItemFwd( row_get_di( row ), diStartRowOrParagraphOrEnd );
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run = ME_FindItemBack( item, diRun );
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cursor->pRun = run;
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cursor->pPara = para_get_di( cursor->pRun->member.run.para );
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cursor->nOffset = (item->type == diStartRow || include_eop) ? cursor->pRun->member.run.len : 0;
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}
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/* I'm sure these functions would simplify some code in caret ops etc,
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* I just didn't remember them when I wrote that code
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*/
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ME_DisplayItem *ME_RowStart(ME_DisplayItem *item) {
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return ME_FindItemBackOrHere(item, diStartRow);
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}
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/*
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ME_DisplayItem *ME_RowEnd(ME_DisplayItem *item) {
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ME_DisplayItem *item2 = ME_FindItemFwd(item, diStartRowOrParagraphOrEnd);
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if (!item2) return NULL;
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return ME_FindItemBack(item, diRun);
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}
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*/
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ME_DisplayItem *
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ME_FindRowWithNumber(ME_TextEditor *editor, int nRow)
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{
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ME_DisplayItem *item = ME_FindItemFwd(editor->pBuffer->pFirst, diParagraph);
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int nCount = 0;
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while (item->type == diParagraph &&
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nCount + item->member.para.nRows <= nRow)
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{
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nCount += item->member.para.nRows;
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item = item->member.para.next_para;
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}
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if (item->type != diParagraph)
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return NULL;
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for (item = ME_FindItemFwd(item, diStartRow); item && nCount < nRow; nCount++)
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item = ME_FindItemFwd(item, diStartRow);
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return item;
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}
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int
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ME_RowNumberFromCharOfs(ME_TextEditor *editor, int nOfs)
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{
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ME_DisplayItem *item = ME_FindItemFwd(editor->pBuffer->pFirst, diParagraph);
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int nRow = 0;
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while (item->type == diParagraph &&
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item->member.para.next_para->member.para.nCharOfs <= nOfs)
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{
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nRow += item->member.para.nRows;
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item = item->member.para.next_para;
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}
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if (item->type == diParagraph)
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{
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ME_DisplayItem *next_para = item->member.para.next_para;
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nOfs -= item->member.para.nCharOfs;
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item = ME_FindItemFwd(item, diRun);
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while ((item = ME_FindItemFwd(item, diStartRowOrParagraph)) != NULL)
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{
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if (item == next_para)
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break;
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item = ME_FindItemFwd(item, diRun);
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if (item->member.run.nCharOfs > nOfs)
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break;
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nRow++;
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}
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}
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return nRow;
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}
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