Apple Newton Programmer’s Newton 2.0 (for Newton 2.0) - Manual (Page 638)

C H A P T E R 1 7
Additional System Services
17-22 Using Additional System Services
initialSetup: // used to initialize view automatically
{
name: 'vMyBarber,
appSymbol: kAppSymbol,
values:
{
icon: kDummyActionIcon,
statusText: "Computing IsHalting…",
closeBox: func()
begin
base:Hide(); //close the status view
//add an action to the Notify Icon, this allows
//the user to reopen the status view, which is
//necessary to allow the user to cancel the
//operation... (we save a reference to the
//action in the app base view to kill later)
GetRoot().(kAppSymbol).theNotifyIconAction :=
GetRoot().notifyIcon:AddAction(
"IsHalting",kNotifyCallbackFunc,nil)
//the notify icon will need this reference to
//the status slip
GetRoot().(kAppSymbol).theStatusSlip := base;
end;
}, //values
}, //initialSetup
} //myStatusTemplate
We defined kNotifyCallbackFunc at compile time, so as to avoid creating
run-time functions (closures) as:
DefConst ('kNotifyCallbackFunc,
func()
begin
if not Visible ( GetRoot().(kAppSymbol) ) then
GetRoot().(kAppSymbol):Open();
GetRoot().(kAppSymbol).theStatusView:Show();
//won't need any more
GetRoot().(kAppSymbol).theStatusView := nil;
end);