COM from scratch - PART ONE

// Component3Wnd.cpp: implementation of the CComponent3Wnd class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "Component3Wnd.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CComponent3Wnd::CComponent3Wnd():m_pComponent3sIUnknown(NULL),m_nItemID(0)
{
	m_cRef=0;
	//Background color for menu when selected with mouse
	m_color_hittest=4294967295;
	//this color will be changed either by the client's view window(OnLeftButtonDown)
	//or by the function OnNcLButtonDown
	m_bMenuHasOpend=false;
    m_pComponent2sIUnknown=NULL;
	m_pComponent1sIUnknown=NULL;   
}
BEGIN_MESSAGE_MAP(CComponent3Wnd, CWnd)
	//{{AFX_MSG_MAP(CComponent3Wnd)
	ON_WM_LBUTTONDOWN()
	ON_WM_MENUSELECT()
	ON_WM_NCLBUTTONDOWN()
	ON_WM_TIMER()
	ON_WM_PAINT()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

CComponent3Wnd::~CComponent3Wnd()
{
	delete this;
}

void CComponent3Wnd::OnLButtonDown(UINT nFlags, CPoint point) 
{
	CDC* pDC=GetDC();
	m_color_hittest=pDC->GetPixel(point);
	if(m_color_hittest==RGB(0,0,0))
	CWnd::OnLButtonDown(nFlags, point);
	CWnd::OnLButtonDown(nFlags, point);
}
/////////////////////////////////////////////////////////////////////////////
void CComponent3Wnd::OnMenuSelect(UINT nItemID, UINT nFlags, HMENU hSysMenu)
{
    
    //Tracking the last selected menu item
    if(nItemID!=0)
        m_nItemID=nItemID;
    
    // Making sure that menu has been opened
    if((nItemID==32790)|| //ID_NIGHT
	   (nItemID==32799)|| // ID_STARTFLY
	   (nItemID==32798)|| // ID_STOPFLY
	   (nItemID==32830)|| //ID_COMP3_ADDREF
	   (nItemID==32776))  //ID_ADDREF for component1
    m_bMenuHasOpend=true;
    
    if((nFlags==0xFFFF)&&(hSysMenu==0))//mouse click has been outside of menu
    {
        
        TRACE(_T("Cliked out side menu\n"));
        //seting a timer event and checking which item has been selected
		SetTimer(1,100,NULL);
    }
    CWnd::OnMenuSelect(nItemID, nFlags, hSysMenu);
}



void CComponent3Wnd::OnNcLButtonDown(UINT nHitTest, CPoint point) 
{
    TRACE(_T("OnNcLButtonDown\n"));
	CDC* pDC=GetDC();
	if(m_bMenuHasOpend)
	{
		m_bMenuHasOpend=false;
		m_color_hittest=pDC->GetPixel (point);
	}	
	
	CWnd::OnNcLButtonDown(nHitTest, point);
}



////////////////////////////////////////////
void CComponent3Wnd::OnTimer(UINT nIDEvent) 
{
	KillTimer(nIDEvent);
	CString str;
	CStdioFile file;
	
if((m_color_hittest==4294967295)&&(m_bMenuHasOpend))
	{	
		switch(m_nItemID)
		{
		  
		    case 32830://ID_COMP3_ADDREF
			m_pComponent3sIUnknown->AddRef();
			break;
			
			case 32831://ID_COMP3_RELEASE
			m_pComponent3sIUnknown->Release();
			break;
		
			//Notify the client to call the Night() method of the inner Component1
			case 32790://ID_NIGHT
			TRACE(_T("Night is selected in the inner component1\n"));
			str="1";
			file.Open("C:\\Comp3Notifyclient.txt",CFile::modeWrite|CFile::typeText);
			file.WriteString(str);
		    break;
	

			//Notify the client to call the StartFlying() method
			case 32799://ID_STARTFLY		    
			str="2";
			file.Open("C:\\Comp3Notifyclient.txt",CFile::modeWrite|CFile::typeText);
			file.WriteString(str);
			file.Close();
			break;
		
			//Notify the client to call the StopFlying() method
			case 32798:
			str="3";
			file.Open("C:\\Comp3Notifyclient.txt",CFile::modeWrite|CFile::typeText);
			file.WriteString(str);
			file.Close();
			break;
		}
		
	}
	
CWnd::OnTimer(nIDEvent);
}

void CComponent3Wnd::OnPaint() 
{
	CPaintDC dc(this); // device context for painting
	CRect rect;
	CRect grassRect;
    CDC*  pDC=GetDC();
    GetClientRect (&rect);
   	CBrush grassbrush;
	grassbrush.CreateSolidBrush(RGB(0,255,0));
	CBrush brush;
	brush.CreateSolidBrush (RGB(0,255,255));
    pDC->FillRect(&rect,&brush);	
	CBitmap bmp, *poldbmp;
    CDC memdc;
    bmp.LoadBitmap("IDB_NATURE" );
  	memdc.CreateCompatibleDC( pDC );
    poldbmp = memdc.SelectObject( &bmp );
    pDC->BitBlt( rect.right -180,rect.bottom-109, 200, 100, &memdc, 0, 0, SRCCOPY );
    memdc.SelectObject( poldbmp );
    grassRect.left=rect.left;
	grassRect.top=rect.bottom-10;
	grassRect.right=rect.right;
	grassRect.bottom=rect.bottom;
	pDC->FillRect(&grassRect,&grassbrush);
	
	// Do not call CWnd::OnPaint() for painting messages
}