caret.c

winNT技术操作系统,国外开放的原代码和LIUX一样

      p = &editor->pCursors[nCursor];
      tp = ME_FindItemBack(p->pRun, diParagraph);
      para = &tp->member.para;
      assert(tp);
      if (p->nOffset) {
        ME_SplitRunSimple(editor, p->pRun, p->nOffset);
        p = &editor->pCursors[nCursor];
      }
      tmp_style = ME_GetInsertStyle(editor, nCursor);
      /* ME_SplitParagraph increases style refcount */
      tp = ME_SplitParagraph(editor, p->pRun, p->pRun->member.run.style);
      p->pRun = ME_FindItemFwd(tp, diRun);
      end_run = ME_FindItemBack(tp, diRun);
      ME_ReleaseStyle(end_run->member.run.style);
      end_run->member.run.style = tmp_style;
      p->nOffset = 0;
      if(pos-str < len && *pos =='\r')
        pos++;
      if(pos-str < len && *pos =='\n')
        pos++;
      if(pos-str <= len) {
        len -= pos - str;
        str = pos;
        continue;
      }
    }
    ME_InternalInsertTextFromCursor(editor, nCursor, str, len, style, 0);
    len = 0;
  }
}

static BOOL ME_ArrowLeft(ME_TextEditor *editor, ME_Cursor *p)
{
  if (p->nOffset) {
    p->nOffset = ME_StrRelPos2(p->pRun->member.run.strText, p->nOffset, -1);
    return TRUE;
  }
  else
  {
    ME_DisplayItem *pRun = ME_FindItemBack(p->pRun, diRunOrParagraph);
    assert(pRun);
    if (pRun->type == diRun) {
      p->pRun = pRun;
      assert(p->pRun->type == diRun);
      assert(pRun->member.run.strText->nLen);
      p->nOffset = pRun->member.run.strText->nLen;
      if (p->nOffset) {
        p->nOffset = ME_StrRelPos2(pRun->member.run.strText, p->nOffset, -1);
        return TRUE;
      }
      else
        assert(0);
    }
    if (pRun->type == diParagraph)
    {
      if (pRun->member.para.prev_para->type == diTextStart)
        return FALSE;
      assert(pRun->member.para.prev_para->type == diParagraph);
      pRun = ME_FindItemBack(pRun, diRunOrParagraph);
      /* every paragraph ought to have at least one run */
      assert(pRun && pRun->type == diRun);
      assert(pRun->member.run.nFlags & MERF_ENDPARA);
      p->pRun = pRun;
      p->nOffset = 0;
      return TRUE;
    }
    assert(0);
  }
  return FALSE;
}

static BOOL ME_ArrowRight(ME_TextEditor *editor, ME_Cursor *p)
{
  ME_DisplayItem *pRun;
  
  if (!(p->pRun->member.run.nFlags & MERF_ENDPARA))
  {
    int new_ofs = ME_StrRelPos2(p->pRun->member.run.strText, p->nOffset, 1);
    
    if (new_ofs<p->pRun->member.run.strText->nLen)
    {
      p->nOffset = new_ofs;
      return TRUE;
    }
  }
  pRun = ME_FindItemFwd(p->pRun, diRun);
  if (pRun) {
    p->pRun = pRun;
    assert(p->pRun->type == diRun);
    p->nOffset = 0;
  }
  return TRUE;
}

int ME_GetCursorOfs(ME_TextEditor *editor, int nCursor)
{
  ME_Cursor *pCursor = &editor->pCursors[nCursor];
  
  return ME_GetParagraph(pCursor->pRun)->member.para.nCharOfs
    + pCursor->pRun->member.run.nCharOfs + pCursor->nOffset;
}

int ME_FindPixelPos(ME_TextEditor *editor, int x, int y, ME_Cursor *result, BOOL *is_eol)
{
  ME_DisplayItem *p = editor->pBuffer->pFirst->member.para.next_para;
  int rx = 0;
  
  if (is_eol)
    *is_eol = 0;

  while(p != editor->pBuffer->pLast)
  {
    if (p->type == diParagraph)
    {
      int ry = y - p->member.para.nYPos;
      if (ry < 0)
      {
        result->pRun = ME_FindItemFwd(p, diRun);
        result->nOffset = 0;
        return 0;
      }
      if (ry >= p->member.para.nHeight)
      {
        p = p->member.para.next_para;
        continue;
      }
      p = ME_FindItemFwd(p, diStartRow);
      y = ry;
      continue;
    }
    if (p->type == diStartRow)
    {
      int ry = y - p->member.row.nYPos;
      if (ry < 0)
        return 0;
      if (ry >= p->member.row.nHeight)
      {
        p = ME_FindItemFwd(p, diStartRowOrParagraphOrEnd);
        if (p->type != diStartRow)
          return 0;
        continue;
      }
      p = ME_FindItemFwd(p, diRun);
      continue;
    }
    if (p->type == diRun)
    {
      ME_DisplayItem *pp;
      rx = x - p->member.run.pt.x;
      if (rx < 0)
        rx = 0;
      if (rx >= p->member.run.nWidth) /* not this run yet... find next item */
      {
        pp = p;
        do {
          p = p->next;
          if (p->type == diRun)
          {
            rx = x - p->member.run.pt.x;
            goto continue_search;
          }
          if (p->type == diStartRow)
          {
            p = ME_FindItemFwd(p, diRun);
            if (is_eol)
              *is_eol = 1;
            rx = 0; /* FIXME not sure */
            goto found_here;
          }
          if (p->type == diParagraph || p->type == diTextEnd)
          {
            rx = 0; /* FIXME not sure */
            p = pp;
            goto found_here;
          }
        } while(1);
        continue;
      }
    found_here:
      if (p->member.run.nFlags & MERF_ENDPARA)
        rx = 0;
      result->pRun = p;
      result->nOffset = ME_CharFromPointCursor(editor, rx, &p->member.run);
      if (editor->pCursors[0].nOffset == p->member.run.strText->nLen && rx)
      {
        result->pRun = ME_FindItemFwd(editor->pCursors[0].pRun, diRun);
        result->nOffset = 0;
      }
      return 1;
    }
    assert(0);
  continue_search:
    ;
  }
  result->pRun = ME_FindItemBack(p, diRun);
  result->nOffset = 0;
  assert(result->pRun->member.run.nFlags & MERF_ENDPARA);
  return 0;
}


int
ME_CharFromPos(ME_TextEditor *editor, int x, int y)
{
  ME_Cursor cursor;
  RECT rc;

  GetClientRect(editor->hWnd, &rc);
  if (x < 0 || y < 0 || x >= rc.right || y >= rc.bottom)
    return -1;
  ME_FindPixelPos(editor, x, y, &cursor, NULL);
  return (ME_GetParagraph(cursor.pRun)->member.para.nCharOfs
          + cursor.pRun->member.run.nCharOfs + cursor.nOffset);
}


void ME_LButtonDown(ME_TextEditor *editor, int x, int y)
{
  ME_Cursor tmp_cursor;
  int is_selection = 0;
  
  editor->nUDArrowX = -1;
  
  y += ME_GetYScrollPos(editor);

  tmp_cursor = editor->pCursors[0];
  is_selection = ME_IsSelection(editor);

  ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);
  
  if (GetKeyState(VK_SHIFT)>=0)
  {
    editor->pCursors[1] = editor->pCursors[0];
  }
  else
  {
    if (!is_selection) {
      editor->pCursors[1] = tmp_cursor;
      is_selection = 1;
    }
  }
  HideCaret(editor->hWnd);
  ME_MoveCaret(editor);
  if (is_selection)
    ME_Repaint(editor);
  ShowCaret(editor->hWnd);
  ME_ClearTempStyle(editor);
  ME_SendSelChange(editor);
}

void ME_MouseMove(ME_TextEditor *editor, int x, int y)
{
  ME_Cursor tmp_cursor;
  
  y += ME_GetYScrollPos(editor);

  tmp_cursor = editor->pCursors[0];
  if (!ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd))
    /* return */;
  
  if (tmp_cursor.pRun == editor->pCursors[0].pRun && 
      tmp_cursor.nOffset == editor->pCursors[0].nOffset)
    return;
  
  HideCaret(editor->hWnd);
  ME_MoveCaret(editor);
  ME_Repaint(editor);
  ShowCaret(editor->hWnd);
  ME_SendSelChange(editor);
}

static ME_DisplayItem *ME_FindRunInRow(ME_TextEditor *editor, ME_DisplayItem *pRow, 
                                int x, int *pOffset, int *pbCaretAtEnd)
{
  ME_DisplayItem *pNext, *pLastRun;
  pNext = ME_FindItemFwd(pRow, diRunOrStartRow);
  assert(pNext->type == diRun);
  pLastRun = pNext;
  *pbCaretAtEnd = FALSE;
  do {
    int run_x = pNext->member.run.pt.x;
    int width = pNext->member.run.nWidth;
    if (x < run_x)
    {
      if (pOffset) *pOffset = 0;
      return pNext;
    }
    if (x >= run_x && x < run_x+width)
    {
      int ch = ME_CharFromPointCursor(editor, x-run_x, &pNext->member.run);
      ME_String *s = pNext->member.run.strText;
      if (ch < s->nLen) {
        if (pOffset)
          *pOffset = ch;
        return pNext;          
      }
    }
    pLastRun = pNext;
    pNext = ME_FindItemFwd(pNext, diRunOrStartRow);
  } while(pNext && pNext->type == diRun);
  
  if ((pLastRun->member.run.nFlags & MERF_ENDPARA) == 0)
  {
    pNext = ME_FindItemFwd(pNext, diRun);
    if (pbCaretAtEnd) *pbCaretAtEnd = 1;
    if (pOffset) *pOffset = 0;
    return pNext;
  } else {
    if (pbCaretAtEnd) *pbCaretAtEnd = 0;
    if (pOffset) *pOffset = 0;
    return pLastRun;
  }
}

static int ME_GetXForArrow(ME_TextEditor *editor, ME_Cursor *pCursor)
{
  ME_DisplayItem *pRun = pCursor->pRun;
  int x;

  if (editor->nUDArrowX != -1)
    x = editor->nUDArrowX;
  else {
    if (editor->bCaretAtEnd)
    {
      pRun = ME_FindItemBack(pRun, diRun);
      assert(pRun);
      x = pRun->member.run.pt.x + pRun->member.run.nWidth;
    }
    else {
      x = pRun->member.run.pt.x;
      x += ME_PointFromChar(editor, &pRun->member.run, pCursor->nOffset);
    }
    editor->nUDArrowX = x;
  }
  return x;
}

static void ME_ArrowUp(ME_TextEditor *editor, ME_Cursor *pCursor)
{
  ME_DisplayItem *pRun = pCursor->pRun;
  ME_DisplayItem *pItem, *pItem2;
  int x = ME_GetXForArrow(editor, pCursor);
  
  if (editor->bCaretAtEnd && !pCursor->nOffset)
  {
    pRun = ME_FindItemBack(pRun, diRun);
    if (!pRun)
      return;
  }
  
  /* start of this row */
  pItem = ME_FindItemBack(pRun, diStartRow);
  assert(pItem);
  /* start of the previous row */
  pItem2 = ME_FindItemBack(pItem, diStartRow);
  /* no previous row = the first line of the first paragraph */
  if (!pItem2) /* can't go up - don't go BOL (as in MS richedit) */
    return;
  /* FIXME
  ME_WrapTextParagraph(editor, ME_FindItemBack(pItem2, diParagraph));
  */
  pCursor->pRun = ME_FindRunInRow(editor, pItem2, x, &pCursor->nOffset, &editor->bCaretAtEnd);
}

static void ME_ArrowDown(ME_TextEditor *editor, ME_Cursor *pCursor)
{
  ME_DisplayItem *pRun = pCursor->pRun;
  ME_DisplayItem *pItem;
  int x = ME_GetXForArrow(editor, pCursor);
  if (!pCursor->nOffset && editor->bCaretAtEnd)
  {
    pRun = ME_FindItemBack(pRun, diRun);
/*    x = pRun->member.run.pt.x + pRun->member.run.nWidth; */
  }
  /* start of the next row */
  pItem = ME_FindItemFwd(pRun, diStartRow);
  /* FIXME If diParagraph is before diStartRow, wrap the next paragraph?
  */
  if (!pItem)
  {
    /* next row not found - ignore */
    return;
  }
  pCursor->pRun = ME_FindRunInRow(editor, pItem, x, &pCursor->nOffset, &editor->bCaretAtEnd);
  assert(pCursor->pRun);
  assert(pCursor->pRun->type == diRun);
}

static void ME_ArrowPageUp(ME_TextEditor *editor, ME_Cursor *pCursor)
{
  ME_DisplayItem *pRun = pCursor->pRun;