// The callback function that hooks up and processes messages
// send to the list-box within the combobox
LRESULT CALLBACK
CTTComboBox::HookListboxWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
CListBox* pList = (CListBox*)CWnd::FromHandle(hWnd);
CTTComboBox* pThisCombo = NULL;
m_mapCombo.Lookup(hWnd, pThisCombo);
if (message == WM_MOUSEMOVE)
{
WORD xPos, yPos;
xPos = LOWORD(lParam);
yPos = HIWORD(lParam);
CPoint point(xPos, yPos);
CRect rcClient;
::GetClientRect(hWnd, &rcClient);
if (rcClient.PtInRect(point))
{// Handle mouse move event that may show a tool-tip window...
CTTComboBox::HandleListboxMouseMove(pList, wParam, point);
}
else
{// However, the list-box may be captured thus we must know when the mouse cursor
// out of the area of the list-box, and send 'WM_MOUSELEAVE' notification.
::SendMessage(hWnd, WM_MOUSELEAVE, wParam, lParam);
}
if (!m_isEnter)
{// Tracking the mouse event which are hovering and leaving.
OnTrackMouseEvent(hWnd, TME_HOVER|TME_LEAVE);
m_isEnter = TRUE;
}
}
else if (message == WM_MOUSELEAVE)
{
// When the mouse cursor has been left current window, the original select of the list-box
// to reset LB_ERR.
m_OriginalSel = LB_ERR;
m_isEnter = FALSE;
// The tool-tip window is hidden
m_tipWnd.ShowWindow(SW_HIDE);
}
else if (message == WM_CAPTURECHANGED)
{ // Ignore the mouse capture changed...
return 1;
}
else if (message == WM_LBUTTONDOWN ||
message == WM_LBUTTONDBLCLK)
{
WORD xPos, yPos;
xPos = LOWORD(lParam);
yPos = HIWORD(lParam);
CPoint point(xPos, yPos);
CRect rcClient;
::GetClientRect(hWnd, &rcClient);
if (rcClient.PtInRect(point))
{
BOOL bOutside;
int curSel = pList->ItemFromPoint(point, bOutside);
if (!bOutside && curSel != LB_ERR)
{
for (int i = 0; i < pThisCombo->m_arrDisabledItems.GetSize(); i++)
{
if ((UINT)curSel == pThisCombo->m_arrDisabledItems.GetAt(i))
{
return TRUE; // Don't process the message
}
}
}
}
}
else if (message == WM_SHOWWINDOW)
{
if (wParam == TRUE) // Show up!
{
pThisCombo->AlignListBoxWithCombo();
}
}
// Get previous window procedure
WNDPROC oldListWndProc;
m_mapWndProc.Lookup(hWnd, oldListWndProc);
// Call previous window procedure
return ::CallWindowProc(oldListWndProc, hWnd, message, wParam, lParam);
}
