mirror of
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131 lines
3.8 KiB
C
131 lines
3.8 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "editor.h"
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ME_DisplayItem *ME_FindRowStart(ME_Context *c, ME_DisplayItem *item,
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int nRelPos) {
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ME_DisplayItem *para = ME_GetParagraph(item);
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ME_MustBeWrapped(c, para);
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if(nRelPos>=0) { /* if this or preceding row */
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while(nRelPos<=0) {
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ME_DisplayItem *item2 = ME_FindItemBack(item, diStartRowOrParagraph);
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if (item2->type == diParagraph)
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{
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if (item2->member.para.prev_para == NULL)
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return item;
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/* if skipping to the preceding paragraph, ensure it's wrapped */
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ME_MustBeWrapped(c, item2->member.para.prev_para);
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item = item2;
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continue;
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}
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else if (item2->type == diStartRow)
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{
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nRelPos++;
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if (nRelPos>0)
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return item;
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item = item2;
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continue;
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}
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assert(0 == "bug in FindItemBack(item, diStartRowOrParagraph)");
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item = item2;
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}
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return item;
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}
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while(nRelPos>0) { /* if one of the next rows */
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ME_DisplayItem *item2 = ME_FindItemFwd(item, diStartRowOrParagraph);
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if (!item2)
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return item;
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if (item2->type == diParagraph)
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{
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if (item2->member.para.next_para == NULL)
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return item;
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continue;
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}
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item = item2;
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nRelPos--;
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}
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return item;
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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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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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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 && nCount + item->member.para.nRows <= nRow)
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{
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nCount += item->member.para.nRows;
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item = ME_FindItemFwd(item, diParagraph);
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}
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if (!item)
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return item;
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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 = editor->pBuffer->pFirst->next;
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int nRow = 0;
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while (item && 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 = ME_FindItemFwd(item, diParagraph);
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}
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if (item)
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{
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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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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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