Hi,
Why not just check the selected item - I believe if a user aborts
it returns LstGetSelection(...)==noListSelection
Shimon
----- Original Message -----
From: P. Douglas Reeder
Sent: Sunday, March 25, 2007 9:44 AM
Subject: Detecting Popup List Cancel
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it is no longer valid if the window has already been disposed of.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?
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