dlls/riched20/list.c

   1 /*
   2  * RichEdit - Basic operations on double linked lists.
   3  *
   4  * Copyright 2004 by Krzysztof Foltman
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21
  22 #include "editor.h"
  23
  24 WINE_DEFAULT_DEBUG_CHANNEL(richedit_lists);
  25
  26 void ME_InsertBefore(ME_DisplayItem *diWhere, ME_DisplayItem *diWhat)
  27 {
  28   diWhat->next = diWhere;
  29   diWhat->prev = diWhere->prev;
  30
  31   diWhere->prev->next = diWhat;
  32   diWhat->next->prev = diWhat;
  33 }
  34
  35 void ME_Remove(ME_DisplayItem *diWhere)
  36 {
  37   ME_DisplayItem *diNext = diWhere->next;
  38   ME_DisplayItem *diPrev = diWhere->prev;
  39   assert(diNext);
  40   assert(diPrev);
  41   diPrev->next = diNext;
  42   diNext->prev = diPrev;
  43 }
  44
  45 static BOOL ME_DITypesEqual(ME_DIType type, ME_DIType nTypeOrClass)
  46 {
  47   switch (nTypeOrClass)
  48   {
  49     case diRunOrParagraph:
  50       return type == diRun || type == diParagraph;
  51     case diRunOrStartRow:
  52       return type == diRun || type == diStartRow;
  53     case diParagraphOrEnd:
  54       return type == diTextEnd || type == diParagraph;
  55     case diStartRowOrParagraph:
  56       return type == diStartRow || type == diParagraph;
  57     case diStartRowOrParagraphOrEnd:
  58       return type == diStartRow || type == diParagraph || type == diTextEnd;
  59     case diRunOrParagraphOrEnd:
  60       return type == diRun || type == diParagraph || type == diTextEnd;
  61     default:
  62       return type == nTypeOrClass;
  63   }
  64 }
  65
  66 /* Modifies run pointer to point to the next run.
  67  * If all_para is FALSE constrain the search to the current para,
  68  * otherwise modify the paragraph pointer if moving into the next paragraph.
  69  *
  70  * Returns TRUE if next run is found, otherwise returns FALSE. */
  71 BOOL ME_NextRun(ME_DisplayItem **para, ME_DisplayItem **run, BOOL all_para)
  72 {
  73   ME_DisplayItem *p = (*run)->next;
  74   while (p->type != diTextEnd)
  75   {
  76     if (p->type == diParagraph) {
  77       if (!all_para) return FALSE;
  78       *para = p;
  79     } else if (p->type == diRun) {
  80       *run = p;
  81       return TRUE;
  82     }
  83     p = p->next;
  84   }
  85   return FALSE;
  86 }
  87
  88 /* Modifies run pointer to point to the previous run.
  89  * If all_para is FALSE constrain the search to the current para,
  90  * otherwise modify the paragraph pointer if moving into the previous paragraph.
  91  *
  92  * Returns TRUE if previous run is found, otherwise returns FALSE. */
  93 BOOL ME_PrevRun(ME_DisplayItem **para, ME_DisplayItem **run, BOOL all_para)
  94 {
  95   ME_DisplayItem *p = (*run)->prev;
  96   while (p->type != diTextStart)
  97   {
  98     if (p->type == diParagraph) {
  99       if (!all_para) return FALSE;
 100       if (para && p->member.para.prev_para->type == diParagraph)
 101         *para = p->member.para.prev_para;
 102     } else if (p->type == diRun) {
 103       *run = p;
 104       return TRUE;
 105     }
 106     p = p->prev;
 107   }
 108   return FALSE;
 109 }
 110
 111 ME_DisplayItem *ME_FindItemBack(ME_DisplayItem *di, ME_DIType nTypeOrClass)
 112 {
 113   if (!di)
 114     return NULL;
 115   di = di->prev;
 116   while(di!=NULL) {
 117     if (ME_DITypesEqual(di->type, nTypeOrClass))
 118       return di;
 119     di = di->prev;
 120   }
 121   return NULL;
 122 }
 123
 124 ME_DisplayItem *ME_FindItemBackOrHere(ME_DisplayItem *di, ME_DIType nTypeOrClass)
 125 {
 126   while(di!=NULL) {
 127     if (ME_DITypesEqual(di->type, nTypeOrClass))
 128       return di;
 129     di = di->prev;
 130   }
 131   return NULL;
 132 }
 133
 134 ME_DisplayItem *ME_FindItemFwd(ME_DisplayItem *di, ME_DIType nTypeOrClass)
 135 {
 136   if (!di) return NULL;
 137   di = di->next;
 138   while(di!=NULL) {
 139     if (ME_DITypesEqual(di->type, nTypeOrClass))
 140       return di;
 141     di = di->next;
 142   }
 143   return NULL;
 144 }
 145
 146 static const char *ME_GetDITypeName(ME_DIType type)
 147 {
 148   switch(type)
 149   {
 150     case diParagraph: return "diParagraph";
 151     case diRun: return "diRun";
 152     case diCell: return "diCell";
 153     case diTextStart: return "diTextStart";
 154     case diTextEnd: return "diTextEnd";
 155     case diStartRow: return "diStartRow";
 156     default: return "?";
 157   }
 158 }
 159
 160 void ME_DestroyDisplayItem(ME_DisplayItem *item)
 161 {
 162   if (0)
 163     TRACE("type=%s\n", ME_GetDITypeName(item->type));
 164   if (item->type==diRun)
 165   {
 166     if (item->member.run.reobj)
 167     {
 168       list_remove(&item->member.run.reobj->entry);
 169       ME_DeleteReObject(item->member.run.reobj);
 170     }
 171     heap_free( item->member.run.glyphs );
 172     heap_free( item->member.run.clusters );
 173     ME_ReleaseStyle(item->member.run.style);
 174   }
 175   heap_free(item);
 176 }
 177
 178 ME_DisplayItem *ME_MakeDI(ME_DIType type)
 179 {
 180   ME_DisplayItem *item = heap_alloc_zero(sizeof(*item));
 181
 182   item->type = type;
 183   item->prev = item->next = NULL;
 184   return item;
 185 }
 186
 187 void ME_DumpDocument(ME_TextBuffer *buffer)
 188 {
 189   /* FIXME this is useless, */
 190   ME_DisplayItem *pItem = buffer->pFirst;
 191   TRACE("DOCUMENT DUMP START\n");
 192   while(pItem) {
 193     switch(pItem->type)
 194     {
 195       case diTextStart:
 196         TRACE("Start\n");
 197         break;
 198       case diCell:
 199         TRACE("Cell(level=%d%s)\n", pItem->member.cell.nNestingLevel,
 200               !pItem->member.cell.next_cell ? ", END" :
 201                 (!pItem->member.cell.prev_cell ? ", START" :""));
 202         break;
 203       case diParagraph:
 204         TRACE("Paragraph(ofs=%d)\n", pItem->member.para.nCharOfs);
 205         if (pItem->member.para.nFlags & MEPF_ROWSTART)
 206           TRACE(" - (Table Row Start)\n");
 207         if (pItem->member.para.nFlags & MEPF_ROWEND)
 208           TRACE(" - (Table Row End)\n");
 209         break;
 210       case diStartRow:
 211         TRACE(" - StartRow\n");
 212         break;
 213       case diRun:
 214         TRACE(" - Run(%s, %d, flags=%x)\n", debugstr_run( &pItem->member.run ),
 215           pItem->member.run.nCharOfs, pItem->member.run.nFlags);
 216         break;
 217       case diTextEnd:
 218         TRACE("End(ofs=%d)\n", pItem->member.para.nCharOfs);
 219         break;
 220       default:
 221         break;
 222     }
 223     pItem = pItem->next;
 224   }
 225   TRACE("DOCUMENT DUMP END\n");
 226 }