www.pudn.com > 《MFC Windows程序设计(第二版)》.rar > ChildView.cpp, change:1998-10-06,size:4712b

// ChildView.cpp : implementation of the CChildView class 
// 
 
#include "stdafx.h" 
#include "Colors.h" 
#include "ChildView.h" 
 
#ifdef _DEBUG 
#define new DEBUG_NEW 
#undef THIS_FILE 
static char THIS_FILE[] = __FILE__; 
#endif 
 
///////////////////////////////////////////////////////////////////////////// 
// CChildView 
 
CChildView::CChildView() 
{ 
	m_nShape = 1; // Triangle 
	m_nColor = 0; // Red 
} 
 
CChildView::~CChildView() 
{ 
} 
 
BEGIN_MESSAGE_MAP(CChildView,CWnd ) 
	//{{AFX_MSG_MAP(CChildView) 
	ON_WM_PAINT() 
	ON_COMMAND(ID_SHAPE_CIRCLE, OnShapeCircle) 
	ON_COMMAND(ID_SHAPE_TRIANGLE, OnShapeTriangle) 
	ON_COMMAND(ID_SHAPE_SQUARE, OnShapeSquare) 
	ON_UPDATE_COMMAND_UI(ID_SHAPE_CIRCLE, OnUpdateShapeCircle) 
	ON_UPDATE_COMMAND_UI(ID_SHAPE_TRIANGLE, OnUpdateShapeTriangle) 
	ON_UPDATE_COMMAND_UI(ID_SHAPE_SQUARE, OnUpdateShapeSquare) 
	ON_WM_CONTEXTMENU() 
	//}}AFX_MSG_MAP 
	ON_COMMAND_RANGE (ID_COLOR_RED, ID_COLOR_BLUE, OnColor) 
	ON_UPDATE_COMMAND_UI_RANGE (ID_COLOR_RED, ID_COLOR_BLUE, OnUpdateColor) 
END_MESSAGE_MAP() 
 
const COLORREF CChildView::m_clrColors[5] = { 
	RGB ( 255,   0,   0), // Red 
	RGB ( 255, 255,   0), // Yellow 
	RGB (   0, 255,   0), // Green 
	RGB (   0, 255, 255), // Cyan 
	RGB (   0,   0, 255)  // Blue 
}; 
 
///////////////////////////////////////////////////////////////////////////// 
// CChildView message handlers 
 
BOOL CChildView::PreCreateWindow(CREATESTRUCT& cs)  
{ 
	if (!CWnd::PreCreateWindow(cs)) 
		return FALSE; 
 
	cs.dwExStyle |= WS_EX_CLIENTEDGE; 
	cs.style &= ~WS_BORDER; 
	cs.lpszClass = AfxRegisterWndClass(CS_HREDRAW|CS_VREDRAW|CS_DBLCLKS,  
		::LoadCursor(NULL, IDC_ARROW), HBRUSH(COLOR_WINDOW+1), NULL); 
 
	return TRUE; 
} 
 
void CChildView::OnPaint()  
{ 
	CPoint points[3]; 
	CPaintDC dc(this); 
	 
	CRect rcClient; 
	GetClientRect (&rcClient); 
 
	int cx = rcClient.Width () / 2; 
	int cy = rcClient.Height () / 2; 
	CRect rcShape (cx - 45, cy - 45, cx + 45, cy + 45); 
 
	CBrush brush (m_clrColors[m_nColor]); 
	CBrush* pOldBrush = dc.SelectObject (&brush); 
 
	switch (m_nShape) {	 
 
	case 0: // Circle 
		dc.Ellipse (rcShape); 
		break; 
 
	case 1: // Triangle 
		points[0].x = cx - 45; 
		points[0].y = cy + 45; 
		points[1].x = cx; 
		points[1].y = cy - 45; 
		points[2].x = cx + 45; 
		points[2].y = cy + 45; 
		dc.Polygon (points, 3); 
		break; 
 
	case 2: // Square 
		dc.Rectangle (rcShape); 
		break; 
	} 
	dc.SelectObject (pOldBrush); 
} 
 
void CChildView::OnShapeCircle()  
{ 
	m_nShape = 0; 
	Invalidate ();	 
} 
 
void CChildView::OnShapeTriangle()  
{ 
	m_nShape = 1; 
	Invalidate ();	 
} 
 
void CChildView::OnShapeSquare()  
{ 
	m_nShape = 2; 
	Invalidate ();	 
} 
 
void CChildView::OnUpdateShapeCircle(CCmdUI* pCmdUI)  
{ 
	pCmdUI->SetCheck (m_nShape == 0);	 
} 
 
void CChildView::OnUpdateShapeTriangle(CCmdUI* pCmdUI)  
{ 
	pCmdUI->SetCheck (m_nShape == 1);	 
} 
 
void CChildView::OnUpdateShapeSquare(CCmdUI* pCmdUI)  
{ 
	pCmdUI->SetCheck (m_nShape == 2);	 
} 
 
void CChildView::OnColor (UINT nID) 
{ 
	m_nColor = nID - ID_COLOR_RED; 
	Invalidate (); 
} 
 
void CChildView::OnUpdateColor (CCmdUI* pCmdUI) 
{ 
	pCmdUI->SetCheck ((int) pCmdUI->m_nID - ID_COLOR_RED == m_nColor); 
} 
 
void CChildView::OnContextMenu(CWnd* pWnd, CPoint point)  
{ 
    CRect rcClient; 
    GetClientRect (&rcClient); 
 
	int cx = rcClient.Width () / 2; 
	int cy = rcClient.Height () / 2; 
	CRect rcShape (cx - 45, cy - 45, cx + 45, cy + 45); 
	 
	CPoint pos = point; 
	ScreenToClient (&pos); 
 
	CPoint points[3]; 
	BOOL bShapeClicked = FALSE; 
	int dx, dy; 
 
	// 
	// Hit test the shape. 
	// 
	switch (m_nShape) { 
 
	case 0: // Circle 
		dx = pos.x - cx; 
		dy = pos.y - cy; 
		if ((dx * dx) + (dy * dy) = (45 * 45)) 
			bShapeClicked = TRUE; 
		break; 
 
	case 1: // Triangle 
		if (rcShape.PtInRect (pos)) { 
	        dx = min (pos.x - rcShape.left, rcShape.right - pos.x); 
	        if ((rcShape.bottom - pos.y)  (2 * dx)) 
	            bShapeClicked = TRUE; 
		} 
		break; 
 
	case 2: // Square 
		if (rcShape.PtInRect (pos)) 
			bShapeClicked = TRUE; 
		break; 
	} 
 
	// 
	// Display a context menu if the shape was clicked. 
	// 
    if (bShapeClicked) { 
        CMenu menu; 
        menu.LoadMenu (IDR_CONTEXTMENU); 
        CMenu* pContextMenu = menu.GetSubMenu (0); 
 
        for (int i=0; i<5; i++) 
            pContextMenu->ModifyMenu (ID_COLOR_RED + i, 
                MF_BYCOMMAND | MF_OWNERDRAW, ID_COLOR_RED + i); 
 
        pContextMenu->TrackPopupMenu (TPM_LEFTALIGN | TPM_LEFTBUTTON | 
            TPM_RIGHTBUTTON, point.x, point.y, AfxGetMainWnd ()); 
        return; 
    } 
 
	// 
	// Call the base class if the shape was not clicked. 
	// 
    CWnd::OnContextMenu (pWnd, point); 
}