implement FontManager

lib/tree.lua

@@ -6,6 +6,7 @@
 Tree           = {
     assets = (require "lib.utils.asset_bundle"):load()
 }
+Tree.fonts     = (require "lib.utils.font_manager"):load("WDXL_Lubrifont_TC") -- дефолтный шрифт
 Tree.panning   = require "lib/panning"
 Tree.controls  = require "lib.controls"
 Tree.level     = (require "lib.level.level").new("procedural", "flower_plains")   -- для теста у нас только один уровень, который сразу же загружен

lib/utils/font_manager.lua

@@ -0,0 +1,87 @@
+--- @alias FontVariant "smallest" | "small" | "medium" | "large" | "headline"
+
+--- @class TextTheme
+--- @field private _sizes {[FontVariant]: integer}
+local theme = {
+    _sizes = {
+        smallest = 10,
+        small = 12,
+        medium = 14,
+        large = 16,
+        headline = 20,
+    }
+}
+theme.__index = theme
+
+--- @param loader fun(size: integer): love.Font?
+function theme.new(loader)
+    local t = {}
+    for tag, size in pairs(theme._sizes) do
+        local f = loader(size)
+        if not f then return nil end
+        t[tag] = f
+    end
+
+    return setmetatable(t, theme)
+end
+
+--- @param variant FontVariant
+--- @return love.Font
+function theme:getVariant(variant)
+    return self[variant]
+end
+
+----------------------------------------------------------
+
+--- A singleton to handle fonts
+--- @class FontManager
+--- @field private _themes table
+local FontManager = {
+    _themes = {}
+}
+
+--- @param name string
+--- @param size integer
+function FontManager.newFont(name, size)
+    local err = function()
+        print("[FontManager]: font " .. name .. " not found!")
+    end
+    local fontDir = Tree.assets.files.fonts[name]
+    if not fontDir then return err() end
+    local font = fontDir.font
+    if not font then return err() end
+    return love.graphics.newFont(font, size)
+end
+
+--- @param name string
+--- @return TextTheme?
+function FontManager:loadTheme(name)
+    self._themes[name] = theme.new(
+        function(size)
+            return self.newFont(name, size)
+        end
+    )
+    return self._themes[name]
+end
+
+--- @param name string
+--- @return TextTheme?
+function FontManager:getTheme(name)
+    return self._themes[name]
+end
+
+--- initial setup
+--- @param defaultFontName string
+function FontManager:load(defaultFontName)
+    local t = self:loadTheme(defaultFontName)
+    if not t then
+        print("[FontManager]: default font " .. defaultFontName .. " is missing")
+        return self
+    end
+
+    local f = t:getVariant("medium")
+    love.graphics.setFont(f)
+    return self
+end
+
+return FontManager