#265 coordinator front panel

coordinator/ui/pgi.lua

@@ -0,0 +1,58 @@
+--
+-- Protected Graphics Interface
+--
+
+local log  = require("scada-common.log")
+local util = require("scada-common.util")
+
+local pgi = {}
+
+local data = {
+    pkt_list = nil,     ---@type nil|graphics_element
+    pkt_entry = nil,    ---@type function
+    -- session entries
+    s_entries = { pkt = {} }
+}
+
+-- link list boxes
+---@param pkt_list graphics_element pocket list element
+---@param pkt_entry function pocket entry constructor
+function pgi.link_elements(pkt_list, pkt_entry)
+    data.pkt_list = pkt_list
+    data.pkt_entry = pkt_entry
+end
+
+-- unlink all fields, disabling the PGI
+function pgi.unlink()
+    data.pkt_list = nil
+    data.pkt_entry = nil
+end
+
+-- add a PKT entry to the PKT list
+---@param session_id integer pocket session
+function pgi.create_pkt_entry(session_id)
+    if data.pkt_list ~= nil and data.pkt_entry ~= nil then
+        local success, result = pcall(data.pkt_entry, data.pkt_list, session_id)
+
+        if success then
+            data.s_entries.pkt[session_id] = result
+        else
+            log.error(util.c("PGI: failed to create PKT entry (", result, ")"), true)
+        end
+    end
+end
+
+-- delete a PKT entry from the PKT list
+---@param session_id integer pocket session
+function pgi.delete_pkt_entry(session_id)
+    if data.s_entries.pkt[session_id] ~= nil then
+        local success, result = pcall(data.s_entries.pkt[session_id].delete)
+        data.s_entries.pkt[session_id] = nil
+
+        if not success then
+            log.error(util.c("PGI: failed to delete PKT entry (", result, ")"), true)
+        end
+    end
+end
+
+return pgi