I need to detect when the user (after tapping on a popup trigger to pop
up a list) does not select an item from the list but rather taps
outside the list or, if using the 5-way control, presses Left or Right
to escape from the list.
There does not appear to be any event related to popSelectEvent. The
API docs for LstHandleEvent merely say "If a penDownEvent is received
while the list's popup window is displayed and the pen position is
outside the bounds of the popup window, the window is dismissed."
The next obvious candidate is a winExit or winEnter event, going from
the list popup window to the form window. The window pointer for the
form is easy enough to obtain, but winEnter with enterWindow equal to
the form window pointer happens in many other circumstances, including
menu commands. I cannot find any "approved" API for getting the
window pointer for the list popup window. The popupWin field of
ListType contains the "handle of the window created when a list is
displayed by calling LstPopupList()", but I'm not seeing a match
between this and the exitWindow field of winExit or winEnter.
Possibly it is no longer valid if the window has already been disposed
of. The switch stament in my MainFormHandleEvent includes:
case winEnterEvent:
if (eventP->data.winEnter.enterWindow ==
(WinPtr)g.mainFormP) {
ListPtr listP;
listP = FrmGetObjectPtr(g.mainFormP,
FrmGetObjectIndex(g.mainFormP, PresetList));
if (eventP->data.winEnter.exitWindow ==
(WinPtr)(listP->popupWin))
{
TurnPreviewOrOverlayOnIfOk();
}
}
break;
case winExitEvent:
listP = FrmGetObjectPtr(g.mainFormP,
FrmGetObjectIndex(g.mainFormP,
PresetList));
if (eventP->data.winExit.exitWindow ==
(WinPtr)(listP->popupWin)) {
TurnPreviewOrOverlayOnIfOk();
}
break;
... where g.mainFormP is a pointer to the form and PresetList is the
resource ID of the popup list. (Yes, one listP variable shadows the
other, but that doesn't matter.) Also, it would be nice not to access
popupWin directly, as ListType is supposed to be an opaque type.
Any suggestions?
--
For information on using the ACCESS Developer Forums, or to unsubscribe, please
see http://www.access-company.com/developers/forums/
