DRAWAREA.CPP

// drawarea.cpp : implementation file 
// 
 
#include "stdafx.h" 
#include "disdraw.h" 
#include "drawdlg.h" 
 
#ifdef _DEBUG 
#define new DEBUG_NEW 
#undef THIS_FILE 
static char THIS_FILE[] = __FILE__; 
#endif 
 
///////////////////////////////////////////////////////////////////////////// 
// CDrawArea 
 
CDrawArea::CDrawArea() 
{ 
} 
 
CDrawArea::~CDrawArea() 
{ 
} 
 
 
BEGIN_MESSAGE_MAP(CDrawArea, CEdit) 
//{{AFX_MSG_MAP(CDrawArea) 
ON_WM_LBUTTONDOWN() 
ON_WM_MOUSEMOVE() 
ON_WM_PAINT() 
ON_WM_RBUTTONUP() 
ON_WM_CTLCOLOR_REFLECT() 
ON_WM_KEYDOWN() 
ON_WM_CHAR() 
ON_WM_SETFOCUS() 
ON_WM_SETCURSOR() 
ON_WM_LBUTTONDBLCLK() 
//}}AFX_MSG_MAP 
END_MESSAGE_MAP() 
 
///////////////////////////////////////////////////////////////////////////// 
// CDrawArea message handlers 
 
void CDrawArea::AddKeystroke(char *mbsKey) 
{ 
// 
// The backspace keystroke should erase the last character 
// 
if (mbsKey[0] == VK_BACK) 
{ 
int nStart, nEnd; 
GetSel(nStart, nEnd); 
SetSel(nEnd-1, nEnd); 
mbsKey[0] = '\0'; 
 
        // 
        // Erasing a line feed should erase the preceding carriage return 
        // 
        CString strText; 
        GetWindowText(strText); 
        int iLength = strText.GetLength(); 
        if (iLength > 0 && strText.GetAt(strText.GetLength() - 1) == '\n') 
            SetSel(nEnd-2, nEnd); 
} 
 
// 
// Append a line feed to a carriage return 
// 
else if (mbsKey[0] == VK_RETURN) 
strcat(mbsKey, "\xa"); 
 
// 
// Store the new keystroke 
// 
ReplaceSel(mbsKey); 
} 
 
 
void CDrawArea::AddLine(LINE line) 
{ 
// 
// Set the clipping region for the drawing 
// 
CClientDC dc(this); 
RECT rect; 
GetClientRect(&rect); 
CRgn rgn; 
rgn.CreateRectRgnIndirect(&rect);  
dc.SelectClipRgn(&rgn); 
 
// 
// Draw the line and save it for redrawing 
// 
dc.MoveTo(line.ptStart); 
dc.LineTo(line.ptEnd); 
    m_listLines.AddTail(line); 
} 
 
 
void CDrawArea::OnLButtonDown(UINT nFlags, CPoint point)  
{ 
// TODO: Add your message handler code here and/or call default 
 
m_ptLast = point; 
SetFocus(); 
} 
 
 
void CDrawArea::OnMouseMove(UINT nFlags, CPoint point)  
{ 
// TODO: Add your message handler code here and/or call default 
 
if (nFlags & MK_LBUTTON) 
{ 
// 
// Add the drawn line to the drawing 
// 
LINE line; 
line.ptStart = m_ptLast; 
line.ptEnd = point; 
        AddLine(line); 
 
// 
// Send the line to the friend 
// 
((CDisdrawDlg *)GetParent())->SendMouseMovement(line); 
 
// 
// Remember the end point of the line  
// 
m_ptLast = point; 
} 
} 
 
 
void CDrawArea::OnPaint()  
{ 
CPaintDC dc(this); // device context for painting 
 
// TODO: Add your message handler code here 
 
// 
// Set the clipping region for the drawing 
// 
RECT rect; 
GetClientRect(&rect); 
CRgn rgn; 
rgn.CreateRectRgnIndirect(&rect);  
dc.SelectClipRgn(&rgn); 
 
// 
// Erase the drawing area 
// 
dc.FillSolidRect(&rect, GetSysColor(COLOR_MENU)); 
 
// 
// Redisplay the text 
// 
    CString strText; 
    GetWindowText(strText); 
    dc.SelectStockObject(ANSI_VAR_FONT); 
    rect.top++; 
    rect.left++; 
    dc.DrawText(strText, &rect, DT_TOP | DT_WORDBREAK); 
 
// 
// Redraw each line 
// 
LINE line; 
POSITION posLine = m_listLines.GetHeadPosition(); 
while (posLine != NULL) 
{ 
line = m_listLines.GetNext(posLine); 
dc.MoveTo(line.ptStart); 
dc.LineTo(line.ptEnd); 
} 
 
// Do not call CEdit::OnPaint() for painting messages 
} 
 
 
void CDrawArea::OnRButtonUp(UINT nFlags, CPoint point)  
{ 
// TODO: Add your message handler code here and/or call default 
 
// 
// Clear the drawing area 
// 
SetSel(0, -1); 
Clear(); 
m_listLines.RemoveAll(); 
RedrawWindow(); 
} 
 
 
BOOL CDrawArea::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)  
{ 
// TODO: Add your message handler code here and/or call default 
 
return 0; 
} 
 
 
void CDrawArea::OnSetFocus(CWnd* pOldWnd)  
{ 
CEdit::OnSetFocus(pOldWnd); 
 
// TODO: Add your message handler code here 
 
HideCaret(); 
} 
 
 
HBRUSH CDrawArea::CtlColor(CDC* pDC, UINT nCtlColor)  
{ 
// TODO: Change any attributes of the DC here 
pDC->SetBkColor(GetSysColor(COLOR_MENU)); 
 
// TODO: Return a non-NULL brush if the parent's handler should not be called 
return HBRUSH((CBrush *)pDC->SelectStockObject(LTGRAY_BRUSH)); 
} 
 
 
void CDrawArea::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)  
{ 
// TODO: Add your message handler code here and/or call default 
 
switch (nChar) 
{ 
case VK_LEFT: 
case VK_RIGHT: 
case VK_UP: 
case VK_DOWN: 
case VK_HOME:break; 
default:CEdit::OnKeyDown(nChar, nRepCnt, nFlags); 
} 
} 
 
 
void CDrawArea::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)  
{ 
// TODO: Add your message handler code here and/or call default 
((CDisdrawDlg *)GetParent())->SendKeystroke(nChar); 
 
CEdit::OnChar(nChar, nRepCnt, nFlags); 
 
RedrawWindow(); 
} 
 
 
void CDrawArea::OnLButtonDblClk(UINT nFlags, CPoint point)  
{ 
// TODO: Add your message handler code here and/or call default 
}