PeaAshMeter
987ce25474
these damn trees are still WIP but I'm confident I'm doing everything right since I've recently embraced Stoicism
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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