dlls/riched20/row.c

   1 /*
   2  * RichEdit - Operations on rows of text (rows are recreated during
   3  * wrapping and are used for displaying the document, they don't keep any
   4  * true document content; delete all rows, rewrap all paragraphs and
   5  * you get them back).
   6  *
   7  * Copyright 2004 by Krzysztof Foltman
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  22  */
  23
  24
  25 #include "editor.h"
  26
  27 /* I'm sure these functions would simplify some code in caret ops etc,
  28  * I just didn't remember them when I wrote that code
  29  */
  30
  31 ME_DisplayItem *ME_RowStart(ME_DisplayItem *item) {
  32   return ME_FindItemBackOrHere(item, diStartRow);
  33 }
  34
  35 /*
  36 ME_DisplayItem *ME_RowEnd(ME_DisplayItem *item) {
  37   ME_DisplayItem *item2 = ME_FindItemFwd(item, diStartRowOrParagraphOrEnd);
  38   if (!item2) return NULL;
  39   return ME_FindItemBack(item, diRun);
  40 }
  41 */
  42
  43 ME_DisplayItem *
  44 ME_FindRowWithNumber(ME_TextEditor *editor, int nRow)
  45 {
  46   ME_DisplayItem *item = ME_FindItemFwd(editor->pBuffer->pFirst, diParagraph);
  47   int nCount = 0;
  48
  49   while (item->type == diParagraph &&
  50          nCount + item->member.para.nRows <= nRow)
  51   {
  52     nCount += item->member.para.nRows;
  53     item = item->member.para.next_para;
  54   }
  55   if (item->type != diParagraph)
  56     return NULL;
  57   for (item = ME_FindItemFwd(item, diStartRow); item && nCount < nRow; nCount++)
  58     item = ME_FindItemFwd(item, diStartRow);
  59   return item;
  60 }
  61
  62
  63 int
  64 ME_RowNumberFromCharOfs(ME_TextEditor *editor, int nOfs)
  65 {
  66   ME_DisplayItem *item = ME_FindItemFwd(editor->pBuffer->pFirst, diParagraph);
  67   int nRow = 0;
  68
  69   while (item->type == diParagraph &&
  70          item->member.para.next_para->member.para.nCharOfs <= nOfs)
  71   {
  72     nRow += item->member.para.nRows;
  73     item = item->member.para.next_para;
  74   }
  75   if (item->type == diParagraph)
  76   {
  77     ME_DisplayItem *next_para = item->member.para.next_para;
  78
  79     nOfs -= item->member.para.nCharOfs;
  80     item = ME_FindItemFwd(item, diRun);
  81     while ((item = ME_FindItemFwd(item, diStartRowOrParagraph)) != NULL)
  82     {
  83       if (item == next_para)
  84         break;
  85       item = ME_FindItemFwd(item, diRun);
  86       if (item->member.run.nCharOfs > nOfs)
  87         break;
  88       nRow++;
  89     }
  90   }
  91   return nRow;
  92 }