reactos/dll/win32/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 #include "editor.h"
  25
  26 /* I'm sure these functions would simplify some code in caret ops etc,
  27  * I just didn't remember them when I wrote that code
  28  */
  29
  30 ME_DisplayItem *ME_RowStart(ME_DisplayItem *item) {
  31   return ME_FindItemBackOrHere(item, diStartRow);
  32 }
  33
  34 /*
  35 ME_DisplayItem *ME_RowEnd(ME_DisplayItem *item) {
  36   ME_DisplayItem *item2 = ME_FindItemFwd(item, diStartRowOrParagraphOrEnd);
  37   if (!item2) return NULL;
  38   return ME_FindItemBack(item, diRun);
  39 }
  40 */
  41
  42 ME_DisplayItem *
  43 ME_FindRowWithNumber(ME_TextEditor *editor, int nRow)
  44 {
  45   ME_DisplayItem *item = ME_FindItemFwd(editor->pBuffer->pFirst, diParagraph);
  46   int nCount = 0;
  47
  48   while (item->type == diParagraph &&
  49          nCount + item->member.para.nRows <= nRow)
  50   {
  51     nCount += item->member.para.nRows;
  52     item = item->member.para.next_para;
  53   }
  54   if (item->type != diParagraph)
  55     return NULL;
  56   for (item = ME_FindItemFwd(item, diStartRow); item && nCount < nRow; nCount++)
  57     item = ME_FindItemFwd(item, diStartRow);
  58   return item;
  59 }
  60
  61
  62 int
  63 ME_RowNumberFromCharOfs(ME_TextEditor *editor, int nOfs)
  64 {
  65   ME_DisplayItem *item = ME_FindItemFwd(editor->pBuffer->pFirst, diParagraph);
  66   int nRow = 0;
  67
  68   while (item->type == diParagraph &&
  69          item->member.para.next_para->member.para.nCharOfs <= nOfs)
  70   {
  71     nRow += item->member.para.nRows;
  72     item = item->member.para.next_para;
  73   }
  74   if (item->type == diParagraph)
  75   {
  76     ME_DisplayItem *next_para = item->member.para.next_para;
  77
  78     nOfs -= item->member.para.nCharOfs;
  79     item = ME_FindItemFwd(item, diRun);
  80     while ((item = ME_FindItemFwd(item, diStartRowOrParagraph)) != NULL)
  81     {
  82       if (item == next_para)
  83         break;
  84       item = ME_FindItemFwd(item, diRun);
  85       if (item->member.run.nCharOfs > nOfs)
  86         break;
  87       nRow++;
  88     }
  89   }
  90   return nRow;
  91 }