#88 hold on rendering unit detail view until we get a status, added waiting animation

graphics/elements/animations/waiting.lua

@@ -0,0 +1,94 @@
+-- Loading/Waiting Animation Graphics Element
+
+local tcd     = require("scada-common.tcallbackdsp")
+
+local element = require("graphics.element")
+
+---@class waiting_args
+---@field parent graphics_element
+---@field id? string element id
+---@field x? integer 1 if omitted
+---@field y? integer 1 if omitted
+---@field fg_bg? cpair foreground/background colors
+
+-- new waiting animation element
+---@param args waiting_args
+---@return graphics_element element, element_id id
+local function waiting(args)
+    local state = 0
+
+    args.width = 4
+    args.height = 3
+
+    -- create new graphics element base object
+    local e = element.new(args)
+
+    local blit_fg = e.fg_bg.blit_fgd
+    local blit_bg = e.fg_bg.blit_bkg
+    local blit_fg_2x = e.fg_bg.blit_fgd .. e.fg_bg.blit_fgd
+    local blit_bg_2x = e.fg_bg.blit_bkg .. e.fg_bg.blit_bkg
+
+    local function update()
+        print("updated waiting")
+        e.window.clear()
+
+        if state >= 0 and state < 7 then
+            -- top
+            e.window.setCursorPos(1 + math.floor(state / 2), 1)
+            if state % 2 == 0 then
+                e.window.blit("\x8f", blit_fg, blit_bg)
+            else
+                e.window.blit("\x8a\x85", blit_fg_2x, blit_bg_2x)
+            end
+
+            -- bottom
+            e.window.setCursorPos(4 - math.ceil(state / 2), 3)
+            if state % 2 == 0 then
+                e.window.blit("\x8f", blit_fg, blit_bg)
+            else
+                e.window.blit("\x8a\x85", blit_fg_2x, blit_bg_2x)
+            end
+        else
+            local st = state - 7
+
+            -- right
+            if st % 3 == 0 then
+                e.window.setCursorPos(4, 1 + math.floor(st / 3))
+                e.window.blit("\x83", blit_bg, blit_fg)
+            elseif st % 3 == 1 then
+                e.window.setCursorPos(4, 1 + math.floor(st / 3))
+                e.window.blit("\x8f", blit_bg, blit_fg)
+                e.window.setCursorPos(4, 2 + math.floor(st / 3))
+                e.window.blit("\x83", blit_fg, blit_bg)
+            else
+                e.window.setCursorPos(4, 2 + math.floor(st / 3))
+                e.window.blit("\x8f", blit_fg, blit_bg)
+            end
+
+            -- left
+            if st % 3 == 0 then
+                e.window.setCursorPos(1, 3 - math.floor(st / 3))
+                e.window.blit("\x83", blit_fg, blit_bg)
+                e.window.setCursorPos(1, 2 - math.floor(st / 3))
+                e.window.blit("\x8f", blit_bg, blit_fg)
+            elseif st % 3 == 1 then
+                e.window.setCursorPos(1, 2 - math.floor(st / 3))
+                e.window.blit("\x83", blit_bg, blit_fg)
+            else
+                e.window.setCursorPos(1, 2 - math.floor(st / 3))
+                e.window.blit("\x8f", blit_fg, blit_bg)
+            end
+        end
+
+        state = state + 1
+        if state >= 12 then state = 0 end
+
+        tcd.dispatch(0.5, update)
+    end
+
+    update()
+
+    return e.get()
+end
+
+return waiting