indicator renaming

graphics/elements/indicators/TriIndicatorLight.lua

@@ -0,0 +1,111 @@
+-- Tri-State Indicator Light Graphics Element
+
+local util    = require("scada-common.util")
+
+local element = require("graphics.element")
+local flasher = require("graphics.flasher")
+
+---@class tristate_indicator_light_args
+---@field label string indicator label
+---@field c1 color color for state 1
+---@field c2 color color for state 2
+---@field c3 color color for state 3
+---@field min_label_width? integer label length if omitted
+---@field flash? boolean whether to flash on state 2 or 3 rather than stay on
+---@field period? PERIOD flash period
+---@field parent graphics_element
+---@field id? string element id
+---@field x? integer 1 if omitted
+---@field y? integer auto incremented if omitted
+---@field fg_bg? cpair foreground/background colors
+---@field hidden? boolean true to hide on initial draw
+
+-- new tri-state indicator light
+---@nodiscard
+---@param args tristate_indicator_light_args
+---@return graphics_element element, element_id id
+local function tristate_indicator_light(args)
+    element.assert(type(args.label) == "string", "label is a required field")
+    element.assert(type(args.c1) == "number", "c1 is a required field")
+    element.assert(type(args.c2) == "number", "c2 is a required field")
+    element.assert(type(args.c3) == "number", "c3 is a required field")
+
+    if args.flash then
+        element.assert(util.is_int(args.period), "period is a required field if flash is enabled")
+    end
+
+    args.height = 1
+    args.width = math.max(args.min_label_width or 1, string.len(args.label)) + 2
+
+    -- create new graphics element base object
+    local e = element.new(args)
+
+    e.value = 1
+
+    local flash_on = true
+
+    local c1 = colors.toBlit(args.c1)
+    local c2 = colors.toBlit(args.c2)
+    local c3 = colors.toBlit(args.c3)
+
+    -- called by flasher when enabled
+    local function flash_callback()
+        e.w_set_cur(1, 1)
+
+        if flash_on then
+            if e.value == 2 then
+                e.w_blit(" \x95", "0" .. c2, c2 .. e.fg_bg.blit_bkg)
+            elseif e.value == 3 then
+                e.w_blit(" \x95", "0" .. c3, c3 .. e.fg_bg.blit_bkg)
+            end
+        else
+            e.w_blit(" \x95", "0" .. c1, c1 .. e.fg_bg.blit_bkg)
+        end
+
+        flash_on = not flash_on
+    end
+
+    -- on state change
+    ---@param new_state integer indicator state
+    function e.on_update(new_state)
+        local was_off = e.value <= 1
+
+        e.value = new_state
+        e.w_set_cur(1, 1)
+
+        if args.flash then
+            if was_off and (new_state > 1) then
+                flash_on = true
+                flasher.start(flash_callback, args.period)
+            elseif new_state <= 1 then
+                flash_on = false
+                flasher.stop(flash_callback)
+
+                e.w_blit(" \x95", "0" .. c1, c1 .. e.fg_bg.blit_bkg)
+            end
+        elseif new_state == 2 then
+            e.w_blit(" \x95", "0" .. c2, c2 .. e.fg_bg.blit_bkg)
+        elseif new_state == 3 then
+            e.w_blit(" \x95", "0" .. c3, c3 .. e.fg_bg.blit_bkg)
+        else
+            e.w_blit(" \x95", "0" .. c1, c1 .. e.fg_bg.blit_bkg)
+        end
+    end
+
+    -- set indicator state
+    ---@param val integer indicator state
+    function e.set_value(val) e.on_update(val) end
+
+    -- draw light and label
+    function e.redraw()
+        e.on_update(1)
+        e.w_write(args.label)
+    end
+
+    -- initial draw
+    e.redraw()
+
+    return e.complete()
+end
+
+return tristate_indicator_light