Toggler for cameras with limited buttons

Toggler LV.lua

--[[ 	
	Still photography toggler script. 
	This is a stripped down version of the full Toggler, recognising the the lack of buttons to toggle with some cameras.
	It will run on other ML enabled cameras.
	Toggles through preset ML settings using the PLAY button.
	Make sure ML menus are preset to the your toggled states.
	Version 1 
	Garry George August 2016
	http://photography.grayheron.net/
--]]

-- Declare some global variables
toggler_play = 1
toggler = KEY.PLAY -- Can be changed to other buttons if available
frsp = false
frsp_ok = false																								

function property.SHUTTER:handler(value) -- Check if shutter value changed between toggles
	if scriptmenu.submenu["Enabled?"].value == "Yes" and frsp then -- then need to recheck FRSP values in case user changes shutter speed
		if camera.shutter.value < 0.2 or camera.shutter.value > 14 then 
			frsp_ok = false  -- outside FRSP range
			menu.set("Shoot","Silent Picture",0)
		else
			frsp_ok = true -- Good to go with FRSP
			menu.set("Shoot","Silent Picture",1)
		end
	end
end

toggler_presets =
{
    {
        name = "OFF ", -- Toggler active but all Toggler menus turned off
        menus=
        {
			{ menu = "Shoot", item = "Advanced Bracket", value = 0},
			{ menu = "Shoot", item = "Silent Picture", value = 0},
			{ menu = "Expo", item = "Auto ETTR", value = 0},
			{ menu = "Expo", item = "Dual ISO", value = 0},
        }
    },
    {
        name = "ETTR", -- ETTR mode
        menus=
        {
			{ menu = "Shoot", item = "Advanced Bracket", value = 0},
			{ menu = "Shoot", item = "Silent Picture", value = 0},
			{ menu = "Expo", item = "Auto ETTR", value = 1},
			{ menu = "Expo", item = "Dual ISO", value = 0},
        }
    },
    {
        name = "DUAL", -- DUAL ISO
        menus=
        {
			{ menu = "Shoot", item = "Advanced Bracket", value = 0},
			{ menu = "Shoot", item = "Silent Picture", value = 0},
			{ menu = "Expo", item = "Auto ETTR", value = 0},
			{ menu = "Expo", item = "Dual ISO", value = 1},
        }
    },
    {
        name = "D+ET", -- DUAL + ETTR
        menus=
        {
			{ menu = "Shoot", item = "Advanced Bracket", value = 0},
			{ menu = "Shoot", item = "Silent Picture", value = 0},
			{ menu = "Expo", item = "Auto ETTR", value = 1},
			{ menu = "Expo", item = "Dual ISO", value = 1},
        }
    },
    {
        name = "BRAC", -- Auto Bracketing
        menus=
        {
			{ menu = "Shoot", item = "Advanced Bracket", value = 1},
			{ menu = "Shoot", item = "Silent Picture", value = 0},
			{ menu = "Expo", item = "Auto ETTR", value = 0},
			{ menu = "Auto ETTR", item = "Shadow SNR limit", value = 0},
			{ menu = "Expo", item = "Dual ISO", value = 0},
        }
    },
    {
        name = "FRSP", -- Full Res Silent Picture
        menus=
        {
			{ menu = "Shoot", item = "Advanced Bracket", value = 0},
			{ menu = "Shoot", item = "Silent Picture", value = 1},
			{ menu = "Expo", item = "Auto ETTR", value = 0},
			{ menu = "Expo", item = "Dual ISO", value = 0},
        }
    },
}

-- You can add other ML 'menu states' by adding to oe extending the above list

mykeypress = function(key)
	if key == toggler and lv.enabled then 
		toggler_play = toggler_play + 1
		if toggler_play > #toggler_presets then toggler_play = 1 end
		if toggler_play < 1 then toggler_play = #toggler_presets end
		for i,v in ipairs(toggler_presets[toggler_play].menus) do
			menu.set(v.menu,v.item,v.value)
		end
		if toggler_presets[toggler_play].name == "FRSP" then frsp = true else frsp = false end -- check if FRSP set in this toggle
		if frsp then -- check shutter value
			if camera.shutter.value < 0.2 or camera.shutter.value > 14 then 
				frsp_ok = false  -- outside FRSP range
				display.notify_box("Check your shutter speed", 3000)
				menu.set("Shoot","Silent Picture",0)
			end
		end
		return false
	else
		return true
	end
end

lv.info
{
	name = "Toggler Info",
	priority = 100,
	value = "",
	update = function(this)
	this.background = COLOR.BLUE
	this.foreground = COLOR.YELLOW
	if scriptmenu.submenu["Enabled?"].value == "Yes" then
		if frsp and not frsp_ok then this.foreground = COLOR.RED end
		this.value = toggler_presets[toggler_play].name
	else
		this.value = ""
	end
	end
}

scriptmenu = menu.new
{
	parent = "Shoot",
	name = "Toggler",
	help = "Toggle through various preset ML options",
	submenu =
	{
		{
			name = "Enabled?",
			help = "Switches the script's on/off state when in LV mode",
			choices = {"No","Yes"},
			depends_on = DEPENDS_ON.LIVEVIEW,
			icon_type = ICON_TYPE.BOOL,
			value = "No", -- ensures script not loaded on camera start
			select = function(this)
				if this.value == "Yes" then
					this.value = "No"
					event.keypress = nil
				else
					this.value = "Yes"
					event.keypress = mykeypress
				end
-- Reset Toggler if enabled state changed
				menu.set("Shoot","Silent Picture",0)
				menu.set("Shoot","Advanced Bracket",0)
				menu.set("Expo","Auto ETTR",0)
				menu.set("Expo","Dual ISO",0)	
				toggler_play = 1
				frsp = false
			end
		}
	}
}