Add a connection matrix dialog (FAForever#5877)

lua/keymap/debugKeyActions.lua

@@ -221,6 +221,10 @@ local keyActionsDebug = {
         action = 'UI_ToggleGamePanels',
         category = 'debug',
     },
+    ['debug_connectivity'] = {
+        action = 'UI_Lua import("/lua/ui/dialogs/connection/ConnectionDialog.lua").ToggleDialog()',
+        category = 'ui'
+    },
 }
 
 ---@type table<string, UIKeyAction>

lua/shared/Subject.lua

@@ -0,0 +1,81 @@
+--**********************************************************************************
+--** Copyright (c) 2024 FAForever
+--**
+--** Permission is hereby granted, free of charge, to any person obtaining a copy
+--** of this software and associated documentation files (the "Software"), to deal
+--** in the Software without restriction, including without limitation the rights
+--** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+--** copies of the Software, and to permit persons to whom the Software is
+--** furnished to do so, subject to the following conditions:
+--**
+--** The above copyright notice and this permission notice shall be included in all
+--** copies or substantial portions of the Software.
+--**
+--** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+--** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+--** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+--** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+--** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+--** OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+--** SOFTWARE.
+--**********************************************************************************
+
+-- upvalue scope for performance
+local WARN = WARN
+
+local StringFormat = string.format
+
+---@class Observable<T>
+---@field Name string
+---@field Subjects table<string, fun(value: any)>
+Subject = ClassSimple {
+
+    ---@generic T
+    ---@param self Observable
+    ---@param name string
+    __init = function(self, name)
+        self.Name = name
+        self.Subjects = {}
+    end,
+
+    --- Adds an observer.
+    ---@generic T
+    ---@param self Observable
+    ---@param callback fun(entity: T)
+    ---@param identifier string
+    AddObserver = function(self, callback, identifier)
+        if not type(identifier) == "string" then
+            WARN(StringFormat("Invalid subject identifier %s for observable %s", tostring(identifier), self.Name))
+            return
+        end
+
+        local oldSubject = self.Subjects[identifier]
+        if oldSubject then
+            WARN(StringFormat("Overwriting subject with identifier '%s' for observable '%s'", identifier, self.Name))
+        end
+
+        self.Subjects[identifier] = callback
+    end,
+
+    --- Removes an observer.
+    ---@param self Observable
+    ---@param identifier string
+    RemoveObserver = function(self, identifier)
+        if not type(identifier) == "string" then
+            WARN(StringFormat("Invalid subject identifier %s for observable %s", tostring(identifier), self.Name))
+            return
+        end
+
+        self.Subjects[identifier] = nil;
+    end,
+
+    ---
+    ---@generic T
+    ---@param self Observable
+    ---@param value T
+    Next = function(self, value)
+        for k, callback in self.Listeners do
+            callback(value)
+        end
+    end,
+}