用VC++在工具栏上添加平面组合框控件(3)

///////////////////////////////// CFlatComboBox

CFlatComboBox::CFlatComboBox()
{
　m_bLBtnDown = false;
}

CFlatComboBox::~CFlatComboBox()
{
}

BEGIN_MESSAGE_MAP(CFlatComboBox, CComboBox)
//{{AFX_MSG_MAP(CFlatComboBox)
ON_WM_MOUSEMOVE()
ON_WM_LBUTTONDOWN()
ON_WM_LBUTTONUP()
ON_WM_TIMER()
ON_WM_PAINT()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

///////////////////////////////////////////////////// CFlatComboBox message handlers
void CFlatComboBox::OnMouseMove(UINT nFlags, CPoint point)
{
　SetTimer(1,10,NULL);
　CComboBox::OnMouseMove(nFlags, point);
}

void CFlatComboBox::OnLButtonDown(UINT nFlags, CPoint point)
{
　m_bLBtnDown = true;
　CComboBox::OnLButtonDown(nFlags, point);
}

void CFlatComboBox::OnLButtonUp(UINT nFlags, CPoint point)
{
　m_bLBtnDown = false;
　Invalidate();
　CComboBox::OnLButtonUp(nFlags, point);
}

void CFlatComboBox::OnTimer(UINT nIDEvent)
{
　POINT pt;
　GetCursorPos(&pt);
　CRect rcItem;
　GetWindowRect(&rcItem);
　static bool bPainted = false;
　// OnLButtonDown, show pressed.
　if (m_bLBtnDown==true) {
　　KillTimer (1);
　　　if (bPainted == true) {
　　　　DrawCombo(FC_DRAWPRESSD, ::GetSysColor(COLOR_BTNSHADOW),
　　　　::GetSysColor(COLOR_BTNHIGHLIGHT));
　　　　bPainted = false;
　　　}
　　return;
　}
　// If mouse leaves, show flat.
　if (!rcItem.PtInRect(pt)) {
　　KillTimer (1);
　　if (bPainted == true) {
　　　　DrawCombo(FC_DRAWNORMAL, ::GetSysColor(COLOR_BTNFACE),::GetSysColor(COLOR_BTNFACE));
　　　　bPainted = false;
　　}
　　return;
　}