edit.c

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				return 0;
			}

			old_x = xPos;
			old_y = yPos;
#endif

		    lpEditItem=(LPEDITITEM)GetWindowLong(hWnd,0); // 得到编辑条目结构指针
		      if(lpEditItem==NULL) return FALSE;


			// set Caret position to LButton Down Position
// !!! Modified By jami chen in 2004.10.18
//			SetPDACaretPosition(hWnd,lpEditItem,xPos,yPos);
			if (SetPDACaretPosition(hWnd,lpEditItem,xPos,yPos) == FALSE)
			{
				// 光标位置没有发生改变
				return 0;
			}
// !!! Modified End

			//  the caret coordinate position is or not in the
			// client rect ???
			// if not in the client rect ,then adjust and return TRUE
			if (AdjustCaretInEditItem(hWnd,lpEditItem)==TRUE)
			{
				// set caret position
				SetPDACaret(hWnd);
				// Set Invert Area
				SetInvertArea(hWnd,lpEditItem);
				// get  hdc
//				DrawPDAEditControl(hWnd);
				InvalidateRect(hWnd,NULL,TRUE);
			}
			else
			{
				// set caret position
				SetPDACaret(hWnd);
				// set invert area
				SetInvertArea(hWnd,lpEditItem);
				// redraw the changed area
				DisplayInvertChange(hWnd,lpEditItem);
			}
	}
  wParam++;
  return 0;
}
// **************************************************
// 声明：static void DoLButtonUp(HWND hWnd,WPARAM wParam,LPARAM lParam)
// 参数：
// 	IN hWnd -- 窗口句柄
// 	IN wParam -- 保留
// 	IN lParam -- MAKELPARAM(x,y),当前鼠标的位置
// 返回值：无
// 功能描述：处理WM_LBUTTONUP消息。
// 引用: 
// **************************************************
static void DoLButtonUp(HWND hWnd,WPARAM wParam,LPARAM lParam)
{
	// Release capture 
	SetCapture(NULL);
	wParam++;
	lParam++;	
}
// **************************************************
// 声明：static void DoProcessChar(HWND hWnd,WPARAM wParam,LPARAM lParam)
// 参数：
// 	IN hWnd -- 窗口句柄
// 	IN wParam -- 保留
// 	IN lParam -- 保留
// 返回值：无
// 功能描述：字符输入，处理WM_CHAR消息。
// 引用: 
// **************************************************
static void DoProcessChar(HWND hWnd,WPARAM wParam,LPARAM lParam)
{
	TCHAR chCharCode;
	LPEDITITEM lpEditItem;
	DWORD dwStyle;
	BOOL bResult;
	DWORD dwShowFlag = PE_SHOWTEXTEND;
	LPTSTR lpShowAddress;
	int nShowLine,nShowPos;
	HDC hdc;
	int xPos,nLine;
	int bDeleteResult;
  BOOL bDeleteInvert = FALSE; 

		// get window style
	   dwStyle=GetWindowLong(hWnd,GWL_STYLE);
     if (dwStyle&ES_READONLY) return;
	   // get struct EDITITEM data
		 lpEditItem=(LPEDITITEM)GetWindowLong(hWnd,0);
     if (lpEditItem==NULL) return;
	   // get will be redrawed start address
	   lpShowAddress=lpEditItem->lpCaretPosition;

     // get input char code
		chCharCode=(TCHAR)wParam;
		if (chCharCode==ENTERCODE)
		{ // the input char is enter code
			if (PickCharacter(0x00,chCharCode,dwStyle)==FALSE) return;
   		//Delete Invert Area
      if (DeleteInvert(hWnd,lpEditItem))
      {
        SetCaretCoordinate(hWnd,lpEditItem);  // 设置光标的坐标
      	AdjustCaretInEditItem(hWnd,lpEditItem); // 调整光标位置
        bDeleteInvert=TRUE;
      }
      // insert enter code
			bResult=InsertChar(hWnd,lpEditItem,0x0d,0x0a);
			// will redraw to the end of the text from the caret position
			dwShowFlag=PE_SHOWTEXTEND;
		}
		else if(chCharCode==BACKSPACE)
		{   // the input char is Backspace

      //Delete Invert Area
      if (DeleteInvert(hWnd,lpEditItem))
      { 
//      	AdjustCaretInEditItem(hWnd,lpEditItem);
        bDeleteInvert=TRUE;
			  bResult=TRUE;
      }
      else
      {
			  // Do backspace operation
			  bDeleteResult=BackSpaceChar(hWnd,lpEditItem);
			  if (bDeleteResult==0)
			  { // the operation failare
				  bResult=FALSE;
			  }
			  else
			  { // the operation success
				  if (bDeleteResult==1) // normal operation
					  dwShowFlag=PE_SHOWLINEEND;
				  else // delete the enter code
					  dwShowFlag=PE_SHOWTEXTEND;
				  bResult=TRUE;
			  }
      }
			// set redraw start addresss
		  lpShowAddress=lpEditItem->lpCaretPosition;
		}
		else
		{ // the input char is normal char
//			if (chCharCode<0)
			if (chCharCode<0 || chCharCode > 0x7F)
			{ // the input char 
				if (lpEditItem->HalfByte==FALSE)
				{ // the input char is chinese high byte
					lpEditItem->HiByte=chCharCode;
					lpEditItem->HalfByte=TRUE;
					return ;
				}
				else
				{ // the input char is chinese low byte
					lpEditItem->LoByte=chCharCode;

					if (PickCharacter(lpEditItem->HiByte,lpEditItem->LoByte,dwStyle)==FALSE) return;
					//Delete Invert Area
		            if (DeleteInvert(hWnd,lpEditItem))
		            {
				         SetCaretCoordinate(hWnd,lpEditItem);  // 设定光标的坐标
		                 AdjustCaretInEditItem(hWnd,lpEditItem); // 调整光标的位置
		             	bDeleteInvert=TRUE;
		            }
					// Insert chinese word
					bResult=InsertChar(hWnd,lpEditItem,lpEditItem->HiByte,lpEditItem->LoByte);
					// clear chinese high and low byte
					lpEditItem->HiByte=0;
					lpEditItem->LoByte=0;
					lpEditItem->HalfByte=FALSE;
					// must redraw to the end of the line from the caret position
					dwShowFlag=PE_SHOWLINEEND;
				}
			}
			else
			{  // 当前字符是ASCII
				lpEditItem->HalfByte=FALSE;  // 不需要等待半个字符
				if (PickCharacter(0,chCharCode,dwStyle)==FALSE) return;  // 当前字符不需要
				if (dwStyle&ES_UPPERCASE) // 要求大写
					chCharCode=toupper(chCharCode); // 转化为大写
				if (dwStyle&ES_LOWERCASE) // 要求小写
					chCharCode=tolower(chCharCode); // 转化为小写
     		//Delete Invert Area
        if (DeleteInvert(hWnd,lpEditItem))
        {
		       SetCaretCoordinate(hWnd,lpEditItem); // 设定光标坐标
      	   AdjustCaretInEditItem(hWnd,lpEditItem); // 调整光标位置
           bDeleteInvert=TRUE;
        }
        // the input char is english char or symbol char
				bResult=InsertChar(hWnd,lpEditItem,0x00,chCharCode);
				// must redraw to the end of the line from the caret position
				dwShowFlag=PE_SHOWLINEEND;
			}
		}
		// get caret coordinate 
        GetCoordinate(hWnd,lpEditItem,lpEditItem->lpCaretPosition,&xPos,&nLine,dwStyle&ES_MULTILINE);
		lpEditItem->nCaretx=xPos-lpEditItem->nDisplayx; // 设定光标的位置
		lpEditItem->nCaretLine=nLine-lpEditItem->nDisplayLine;
		if (bResult)
		{ // the insert operation success ,must the redraw the window
			// add code : if Caret out of the client area then must 
			// Reset Display Position
			if (AdjustCaretInEditItem(hWnd,lpEditItem)==TRUE)
			{// 要求全部显示
			    lpShowAddress=NULL;
				nShowPos=0;
				nShowLine=0;
				dwShowFlag=PE_SHOWCLIENT;
			}
			else
			{
				// get redraw start coordinate
	   		 GetCoordinate(hWnd,lpEditItem,lpShowAddress,&xPos,&nLine,dwStyle&ES_MULTILINE); // 得到光标位置
				nShowPos=xPos;  // 从光标开始显示
				nShowLine=nLine;
			}

      if (bDeleteInvert==TRUE)
      {  // 要求全部显示
		    lpShowAddress=NULL;
				nShowPos=0;
				nShowLine=0;
				dwShowFlag=PE_SHOWCLIENT;
      }

			SendNotificationMsg(hWnd,EN_CHANGE);

			// redraw the window
			hdc=GetDC(hWnd);
	        DrawPDAEditSpecialText(hWnd,hdc,lpEditItem,lpShowAddress,nShowPos,nShowLine,0,dwShowFlag); // 显示要显示的部分
			ReleaseDC(hWnd,hdc);
			// reset thw caret
		}
		SetPDACaret(hWnd);  // 设定光标
    lParam++;
}
// **************************************************
// 声明：static BOOL PickCharacter(CHAR HiByte,CHAR LoByte,DWORD dwStyle)
// 参数：
// 	IN HiByte -- 高字节
// 	IN LoByte -- 低字节
// 	IN dwStyle -- 编辑区风格
// 返回值：需要字符，返回TRUE，否则返回FALSE。
// 功能描述：选择字符是否符合当前类型的编辑区。
// 引用: 
// **************************************************
// delete By Jami chen in 2004.06.12
/*static BOOL PickCharacter(CHAR HiByte,CHAR LoByte,DWORD dwStyle)
{
	if (dwStyle&ES_NUMBER)
	{  // the edit control is number ,then Only Receive 0--9
		if (HiByte!=0) return FALSE;
		if (LoByte>'9'||LoByte<'0') return FALSE;
	}
	if ((dwStyle&ES_MULTILINE)==0)
	{ // if this is single line then not receive the entercode
		if (LoByte==ENTERCODE&&HiByte==0) return FALSE;
	}
	if (HiByte==0&&LoByte<0x20)
	{// not receive the character of not display
		if (LoByte!=ENTERCODE) return FALSE;
	}
	return TRUE;
}
*/
// **************************************************
// 声明：static void DoKeyDown(HWND hWnd,WPARAM wParam,LPARAM lParam)
// 参数：
// 	IN hWnd -- 窗口句柄
// 	IN wParam -- 虚键值
// 	IN lParam -- 保留
// 返回值：无
// 功能描述：处理WM_KEYDOWN消息。
// 引用: 
// **************************************************
static void DoKeyDown(HWND hWnd,WPARAM wParam,LPARAM lParam)
{
	int nVirtKey ;
  int nPageLine,nScrollLine,iHorzPos = MOTIONLESS;

		nVirtKey = (int) wParam;    // virtual-key code
    nPageLine=GetPageLine(hWnd);  // 得到一页的编辑行数
    nScrollLine=0;
		switch(nVirtKey)
		{
			case VK_PRIOR:// page up
				nScrollLine=0-nPageLine;
				break;
			case VK_NEXT:// page down
				nScrollLine=nPageLine;
				break;
			case VK_END://  to the text end
				iHorzPos=MOVETOEND;
				break;
			case VK_HOME:// to the text start
				iHorzPos=MOVETOHOME;
				break;
			case VK_LEFT:// to the left Char
				iHorzPos=MOVETOLEFT;
				break;
			case VK_UP:// to the up line
				nScrollLine=-1;
				break;
			case VK_RIGHT://  to the right Char
				iHorzPos=MOVETORIGHT;
				break;
			case VK_DOWN:// to the line down
				nScrollLine=1;
				break;
			case VK_DELETE: // delete char
				DoDeleteChar(hWnd);
				return;
			default :
				return;
		};
	if (nScrollLine==0)
	{
		if (iHorzPos!=MOTIONLESS)
		{
	    	LPEDITITEM lpEditItem;

		    // get struct EDITITEM data
		    lpEditItem=(LPEDITITEM)GetWindowLong(hWnd,0);
		    if (lpEditItem==NULL)
				return;
			HorzMoveCaret(hWnd,lpEditItem,iHorzPos);  // 水平移动光标
		}
//		return;
	}
    ScrollCaretInPDAEdit(hWnd,nScrollLine); // 滚动光标
    lParam++;
}
// **************************************************
// 声明：int GetTextHeight(HWND hWnd)
// 参数：
// 	IN hWnd -- 窗口句柄
// 返回值：返回编辑文本高度。
// 功能描述：达到编辑文本高度。
// 引用: 
// **************************************************
int GetTextHeight(HWND hWnd)
{
	HDC hdc;
	TEXTMETRIC TextMetric;
  int nTextHeight;
  DWORD dwStyle;
		hdc=GetDC(hWnd);
		// get current text property
		GetTextMetrics(hdc,&TextMetric);  
    ReleaseDC(hWnd,hdc);
    nTextHeight=(int)TextMetric.tmHeight;

    dwStyle=GetWindowLong(hWnd,GWL_STYLE);
		// add a dot line height , 1 dot
    if (dwStyle&ES_LINESEPARATE)
      nTextHeight+=1;
		return nTextHeight;
}
// **************************************************
// 声明：static void DoGetCaretPosition(HWND hWnd,WPARAM wParam,LPARAM lParam)
// 参数：
// 	IN hWnd -- 窗口句柄
// 	OUT wParam -- LPINT 指向INT的指针，存放光标所在的行。
// 	OUT lParam -- LPINT 指向INT的指针，存放光标所在的X坐标。
// 返回值：无
// 功能描述：得到当前光标的位置，处理EM_GETCARETPOS消息。
// 引用: 
// **************************************************
static void DoGetCaretPosition(HWND hWnd,WPARAM wParam,LPARAM lParam)
{
  int *lpnLine,*lpxPos;
    	LPEDITITEM lpEditItem;

#ifdef _MAPPOINTER
	wParam = (WPARAM)MapPtrToProcess( (LPVOID)wParam, GetCallerProcess() );  // 映射指针