I'm finding this very slow going, and would appreciate some tips to help
me understand one or two issues.
I have a very simple menu:
Code:
--------------------
menu = SimpleMenu("menu",
{
})
menu:addItem({
text = self:string("SQUEEZEEXT"),
style = 'item_choice',
iconStyle = "digital",
check = Choice(
"choice",
{ "On", "Off" },
function(obj, selectedIndex)
log:info(selectedIndex)
end,
2
)
})
--------------------
This creates a simple one-line menu item that toggles between 'On' and
'Off'. It starts with 'Off' (as given by the index value of 2).
'selectedIndex' is logged to the terminal, and I can see that it
corresponds to the currently selected value.
What I'd like to know is whether it's possible to set the choice to 'On'
or 'Off' programmatically, from within the callback function. In my
intended code I'd like to call some code when 'On' is selected, which
may or may not succeed - if it doesn't succeed, then I'd like to revert
to 'Off' again, programmatically (*see below for the reasoning).
The Jive Lua source code conventions page in the wiki says that
'setSelectedIndex' can be used for this, and that doing so will call the
callback function again.
Code:
--------------------
-- New choice with options On and Off, Off is selected
local choice = jive.ui.Choice(
"choice",
{ "On", "Off" },
function(object, selectedIndex)
print("Choice is " .. tostring(selectedIndex))
end,
2
)
-- Change checkbox state
choice:setSelectedIndex(1)
--------------------
I have all sorts of problems with this.
1) The sample code above uses the word 'choice' in a couple of places
('local *choice* =', "*choice*") and it's not clear to me which instance
is the one referred to by '*choice*:setSelectedIndex'. So in my own
code at the top, should I use '*check*:setSelectedIndex' or
'*choice*:setSelectedIndex'? Neither seems to work.
2) If setting the selected index from within the function calls the
callback function again, it seems like this could go on forever. If I
can't set the index from within the callback function, where else can I
set it? My menu is set up inside 'function
setupJogglerSqueezelite(self, menuItem)' - this sets up the menus once
when the window is loaded, and thereafter the menus operate
autonomously. It's the result of selecting a menu item that I want to
act on.
*What I'm trying to achieve:
I'm trying to start squeezelite on an external USB device. I can list
the devices, and select from them as a Radio Group. The problem is that
when I attempt to start squeezelite on some of the listed devices it
won't start (e.g. on surround21, surround41, surround51). I can detect
those cases, but the menu item displays 'On', since it was toggled from
'Off' when I selected it in order to try to start squeezelite. So in
the cases where squeezelite fails to start I'd like to programmatically
toggle the menu back to 'Off', so that it's clear to the user that
squeezelite didn't start. I'm also trying to put up a popup message when
that happens - see my other question about popup messages not
disappearing after the specified time - honestly, trying to program in
Jive/Lua, with very little experience in this type of language, has been
like pulling teeth!
[image:
http://www.cjh.me.uk/MyPhotobucket/cache/DIYHifi/Jivelite/jivelite0011_512.jpg]
------------------------------------------------------------------------
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