Australian Personal Computer 1999 July/APC47-1.ISO/workshop/win95/pws/msmqocm.cab/DRAWAREA.CPP

C/C++ Source or Header | 1997-10-06 | 4.9 KB | 255 lines

// 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
}