96 lines
2.6 KiB
Lua
96 lines
2.6 KiB
Lua
local Element = require "lib.simple_ui.core.element"
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--- Объект, который отвечает за работу с элементами интерфейса одного экрана
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--- @class UIBuilder
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--- @field private _cache UIElement[]
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--- @field elementTree UIElement
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--- @field private shadowTree UIElement
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local builder = {}
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builder.__index = builder
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--- @return UIBuilder
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local function new(from)
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from._cache = {}
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from.shadowTree = Element:new {}
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setmetatable(from, builder)
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return from
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end
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-- --- @param element? UIElement
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-- --- @private
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-- function builder:_get(element)
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-- if not element then return nil end
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-- local key = builder:_makeKey(element)
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-- if not key then return element end
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-- local cached = self._cache[key]
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-- if cached then return cached end
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-- self._cache[key] = element
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-- return element
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-- end
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--- @param newNode UIElement?
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--- @param oldNode UIElement?
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--- @private
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function builder:didChange(newNode, oldNode)
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if not oldNode or not newNode then
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return true
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end
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if oldNode.type ~= newNode.type then return true end
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if oldNode.key ~= newNode.key then return true end
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return false
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end
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--- @param element UIElement
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--- @private
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function builder:_makeKey(element)
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--if not element.key then return nil end
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if type(element.key) == "string" then return element.key end
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element.key = element.type .. "<" .. tostring(element.key) .. ">"
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return element.key
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end
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--- @private
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function builder:build_step(cur)
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if cur.build then
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local orphan = cur:build()
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local child = cur.child
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child = orphan
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if not child then return end
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child._parent_ = cur
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cur.child = child
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self:build_step(cur.child)
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elseif cur.children then
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for _, child in ipairs(cur.children) do
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child._parent_ = cur
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self:build_step(child)
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end
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end
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end
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--- Этот метод раскрывает всех отложенных (через build) детей в дереве и хитро их кэширует, чтобы не перестраивались постоянно
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---
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--- Благодаря этому можно каждый раз создавать новые элементы в верстке, а получать старые :)
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function builder:build()
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local root = self.elementTree
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self:build_step(root)
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end
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function builder:layout()
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self.elementTree:layout()
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end
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function builder:update(dt)
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self.elementTree:update(dt)
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end
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function builder:draw()
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self.elementTree:draw()
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end
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return new
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