added menu handler

menu.lua

@@ -0,0 +1,123 @@
+require 'config'
+require 'button'
+
+-- Menu state class
+---@class MenuState
+---@field buttons Button[]
+MenuState = {
+    buttons = {}
+}
+
+-- Factory function
+---@param buttons Button[] | nil
+---@return MenuState
+function MenuState:new( buttons )
+    local state = {
+        buttons = buttons or MenuState.buttons
+    }
+
+    setmetatable( state, { __index = self } )
+
+    return state
+end
+
+-- Draw buttons
+function MenuState:draw()
+    for _, button in ipairs(self.buttons) do
+        button:draw()
+    end
+end
+
+-- Update buttons
+---@param dt number
+---@param point Point
+---@param pressed boolean
+function MenuState:update( dt, point, pressed )
+    for _, button in pairs(self.buttons) do
+        button:update( dt, point, pressed )
+    end
+end
+
+---@enum MenuStateIndex
+MenuStateIndex = {
+    start = 'start',
+    pause = 'pause',
+    levels = 'levels',
+    hidden = 'hidden'
+}
+
+local startButton = Button:new(
+    Point:new( 240, 120 ),
+    Point:new( 320, 80 ),
+    nil,
+    nil,
+    function()
+        Menu.current_state = MenuStateIndex.hidden
+        GameGrid = LevelHandler:first()
+        Menu.updateCellSize()
+    end
+)
+
+local exitToMenuButton = Button:new(
+    Point:new( 240, 200 ),
+    Point:new( 320, 80 ),
+    nil,
+    nil,
+    function()
+        Menu.current_state = MenuStateIndex.start
+    end
+)
+
+local exitGameButton = Button:new(
+    Point:new( 240, 240 ),
+    Point:new( 320, 80 ),
+    nil,
+    nil,
+    function()
+        love.event.quit()
+    end
+)
+
+-- Menu handler
+---@class Menu
+---@field states MenuState[]
+---@field current_state MenuStateIndex
+Menu = {
+    states = {
+        -- Main menu
+        [MenuStateIndex.start] = MenuState:new({
+            startButton, exitGameButton
+        }),
+        -- Pause menu
+        [MenuStateIndex.pause] = MenuState:new({
+            exitToMenuButton
+        }),
+        -- Level selector
+        [MenuStateIndex.levels] = MenuState:new({
+        }),
+        -- Empty state 
+        [MenuStateIndex.hidden] = MenuState:new()
+    },
+    current_state = MenuStateIndex.start
+}
+
+-- Draw current state
+function Menu:draw()
+    self.states[self.current_state]:draw()
+end
+
+-- Update current state
+---@param dt number
+---@param point Point
+---@param pressed boolean
+function Menu:update( dt, point, pressed )
+    self.states[self.current_state]:update( dt, point, pressed )
+end
+
+function Menu.updateCellSize()
+    local width, height = love.graphics.getDimensions()
+    local gridX, gridY = GameGrid.size:coords();
+    local isWidthBased = (width / height) / (gridX / gridY)
+    Config.cellSize = math.floor(isWidthBased and height / gridY or width / gridX)
+    love.graphics.setLineWidth( Config.cellSize * Config.lineWidth )
+end