How to use popup-menu to simulate menu assigned to window?

for the window skined with no-regular region, the menu assigned to window is difficult to be placed on it's normal location, so it does not work. I will introduce to you a way that use popup-menu to simulate menu assigned to window.

first, draw a menu’ effect in any region on the window. the region we call it menu-region, we will save every menu-item's rect.

CRect m_rcMenu[3];

we handle tree three messages mostly: WM_LBUTTONDOWN, WM_MOUSEMOVE, WM_ENTERIDLE.

BEGIN_MESSAGE_MAP(CMyDlg, CDialog)

//{{AFX_MSG_MAP(CMyDlg)

ON_WM_LBUTTONDOWN( )

ON_WM_MOUSEMOVE()

ON_WM_ENTERIDLE()

//}}AFX_MSG_MAP

END_MESSAGE_MAP()

when the mouse left button is pushed in the menu-region, we start to use popup-menu to simulate menu assigned to window.

void CMyDlg::OnLButtonDown(UINT nFlags, CPoint ptStart)

{

for (i=0 ;i<3; i++)

{

if (PtInRect(m_rcMenu[i], point))

{

if (!PtInRect(m_rcMenu[m_iMenuIndex], point))

{

InvalidateRect(&m_rcMenu[m_iMenuIndex], TRUE);

UpdateWindow();

}

//this is the popup menu index be shown.

m_iMenuIndex = i;

m_bShowMenu = TRUE;

show the menu, if m_bMenuContinue is TRUE, show new popup menu repeated, and older is cleared on WM_ENTERIDLE, because when menu assigned to window is shown and the mouse move in menu-region(no left button down), the menu item changes.

{

//draw the effect that menu is pushed.

CDC* pDC = GetDC();

pDC->Draw3dRect(&m_rcMenu[m_iMenuIndex], RGB(100, 100, 100), RGB(160, 160, 160));

ReleaseDC(pDC);

m_bMenuContinue = FALSE;

ShowMenu();

} while(m_bMenuContinue);

InvalidateRect(&m_rcMenu[m_iMenuIndex], TRUE);

UpdateWindow();

m_bShowMenu = FALSE;

CWnd::OnLButtonDown(nFlags, point);

return;

}

if ( i== 3)

m_iMenuIndex = -1;

CDialog::OnLButtonDown(nFlags, point);

}

then change the menu index in OnMouseMove

void CMyDlg::OnMouseMove(UINT nFlags, CPoint point)

{

// TODO: Add your message handler code here and/or call default

//undo the effect that menu be pushed.

if (m_iMenuIndex != -1)

{

if (!PtInRect(m_rcMenu[m_iMenuIndex], point))

InvalidateRect(&m_rcMenu[m_iMenuIndex], TRUE);

}

UpdateWindow();

m_iMenuIndex = -1;

for (i=0 ;i<3; i++)

{

if (PtInRect(m_rcMenu[i], point))

{

//change the index

m_iMenuIndex = i;

//draw the effect that mouse stop on it without left-button down.

CDC* pDC = GetDC();

pDC->Draw3dRect(&m_rcMenu[i], RGB(160, 160, 160), RGB(100, 100, 100));

ReleaseDC(pDC);

break;

}

CDialog::OnMouseMove(nFlags, point);

}

cancel the popup menu in OnEnterIdle and re-show it in OnLButtonDown's do-while loop.

void CMyDlg::OnEnterIdle(UINT nWhy, CWnd* pWho)

{

CWnd::OnEnterIdle(nWhy, pWho);

// TODO: Add your message handler code here

if (nWhy == MSGF_MENU)

{

if (!m_bShowMenu)

return;

CPoint point;

GetCursorPos(&point);

ScreenToClient(&point);

for (int i=0 ;i<3; i++)

{

if (PtInRect(m_rcMenu[i], point))

{

if (m_iMenuIndex != i)

{

if (m_iMenuIndex != -1)

{

if (!PtInRect(m_rcMenu[m_iMenuIndex], point))

{

InvalidateRect(&m_rcMenu[m_iMenuIndex], TRUE);

UpdateWindow();

}

m_iMenuIndex = i;

m_bMenuContinue = TRUE;

SendMessage(WM_CANCELMODE);

}

break;

}

last, this is the code for show menu.

void CMyDlg::ShowMenu()

{

if (m_PopupMenu.GetSafeHmenu())

m_PopupMenu.DestroyMenu();

m_PopupMenu.LoadMenu(IDR_POPUP);

CMenu* pSub = m_PopupMenu.GetSubMenu(m_iMenuIndex);

CPoint pt(m_rcMenu[m_iMenuIndex].left, m_rcMenu[m_iMenuIndex].bottom+2);

ClientToScreen(&pt);

TrackPopupMenu(pSub->GetSafeHmenu(), TPM_LEFTALIGN |

TPM_LEFTBUTTON, pt.x, pt.y, NULL, m_hWnd, NULL);

}

so we can use popup menu to simulate menu assigned to window with this code. you can place your menu on any location in the window skined with no-regular region.

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