immediate mode state management cleanup
This commit is contained in:
Michael Freno
@@ -1,318 +1,492 @@
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-- ====================
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-- State Manager Module
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-- ====================
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-- Provides centralized state management for immediate mode GUI elements
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-- Handles hover, pressed, disabled, and other interactive states properly
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-- Manages state change events and integrates with theme components
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-- Unified state management system for immediate mode GUI elements
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-- Combines ID-based state persistence with interactive state tracking
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-- Handles all element state: interaction, scroll, input, click tracking, etc.
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---@class StateManager
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local StateManager = {}
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-- State storage: ID -> state table
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local stateStore = {}
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-- Frame tracking metadata: ID -> {lastFrame, createdFrame, accessCount}
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local stateMetadata = {}
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-- Frame counter
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local frameNumber = 0
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-- Counter to track multiple elements created at the same source location (e.g., in loops)
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local callSiteCounters = {}
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-- Configuration
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local config = {
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stateRetentionFrames = 60, -- Keep unused state for 60 frames (~1 second at 60fps)
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maxStateEntries = 1000, -- Maximum state entries before forced GC
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stateRetentionFrames = 60, -- Keep unused state for 60 frames (~1 second at 60fps)
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maxStateEntries = 1000, -- Maximum state entries before forced GC
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}
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-- State change listeners
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local stateChangeListeners = {}
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-- ====================
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-- ID Generation
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-- ====================
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--- Get or create a state object for an element ID
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---@param id string Element ID
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---@return table state State object for the element
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function StateManager.getState(id)
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if not stateStore[id] then
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stateStore[id] = {
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hover = false,
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pressed = false,
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focused = false,
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disabled = false,
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active = false,
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-- Scrollbar-specific states
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scrollbarHoveredVertical = false,
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scrollbarHoveredHorizontal = false,
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scrollbarDragging = false,
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hoveredScrollbar = nil, -- "vertical" or "horizontal"
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scrollbarDragOffset = 0,
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-- Frame tracking
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lastHoverFrame = 0,
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lastPressedFrame = 0,
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lastFocusFrame = 0,
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lastUpdateFrame = 0,
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}
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--- Generate a hash from a table of properties
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---@param props table
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---@param visited table|nil Tracking table to prevent circular references
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---@param depth number|nil Current recursion depth
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---@return string
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local function hashProps(props, visited, depth)
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if not props then return "" end
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-- Initialize visited table on first call
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visited = visited or {}
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depth = depth or 0
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-- Limit recursion depth to prevent deep nesting issues
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if depth > 3 then
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return "[deep]"
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end
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-- Check if we've already visited this table (circular reference)
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if visited[props] then
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return "[circular]"
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end
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-- Mark this table as visited
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visited[props] = true
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local parts = {}
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local keys = {}
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-- Properties to skip (they cause issues or aren't relevant for ID generation)
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local skipKeys = {
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callback = true,
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parent = true,
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children = true,
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onFocus = true,
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onBlur = true,
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onTextInput = true,
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onTextChange = true,
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onEnter = true,
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userdata = true,
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}
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-- Collect and sort keys for consistent ordering
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for k in pairs(props) do
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if not skipKeys[k] then
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table.insert(keys, k)
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end
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return stateStore[id]
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end
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table.sort(keys)
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-- Build hash string from sorted key-value pairs
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for _, k in ipairs(keys) do
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local v = props[k]
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local vtype = type(v)
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if vtype == "string" or vtype == "number" or vtype == "boolean" then
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table.insert(parts, k .. "=" .. tostring(v))
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elseif vtype == "table" then
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table.insert(parts, k .. "={" .. hashProps(v, visited, depth + 1) .. "}")
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end
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end
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return table.concat(parts, ";")
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end
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--- Update state for an element ID
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--- Generate a unique ID from call site and properties
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---@param props table|nil Optional properties to include in ID generation
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---@return string
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function StateManager.generateID(props)
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-- Get call stack information
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local info = debug.getinfo(3, "Sl") -- Level 3: caller of Element.new -> caller of generateID
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if not info then
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-- Fallback to random ID if debug info unavailable
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return "auto_" .. tostring(math.random(1000000, 9999999))
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end
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local source = info.source or "unknown"
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local line = info.currentline or 0
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-- Create ID from source file and line number
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local baseID = source:match("([^/\\]+)$") or source -- Get filename
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baseID = baseID:gsub("%.lua$", "") -- Remove .lua extension
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local locationKey = baseID .. "_L" .. line
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-- Track how many elements have been created at this location
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callSiteCounters[locationKey] = (callSiteCounters[locationKey] or 0) + 1
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local instanceNum = callSiteCounters[locationKey]
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baseID = locationKey
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-- Add instance number if multiple elements created at same location (e.g., in loops)
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if instanceNum > 1 then
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baseID = baseID .. "_" .. instanceNum
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end
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-- Add property hash if provided (for additional differentiation)
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if props then
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local propHash = hashProps(props)
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if propHash ~= "" then
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-- Use first 8 chars of a simple hash
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local hash = 0
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for i = 1, #propHash do
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hash = (hash * 31 + string.byte(propHash, i)) % 1000000
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end
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baseID = baseID .. "_" .. hash
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end
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end
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return baseID
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end
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-- ====================
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-- State Management
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-- ====================
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--- Get state for an element ID, creating if it doesn't exist
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---@param id string Element ID
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---@param defaultState table|nil Default state if creating new
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---@return table state State table for the element
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function StateManager.getState(id, defaultState)
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if not id then
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error("StateManager.getState: id is required")
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end
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-- Create state if it doesn't exist
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if not stateStore[id] then
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-- Merge default state with standard structure
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stateStore[id] = defaultState or {}
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-- Ensure all standard properties exist with defaults
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local state = stateStore[id]
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-- Interaction states
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if state.hover == nil then state.hover = false end
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if state.pressed == nil then state.pressed = false end
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if state.focused == nil then state.focused = false end
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if state.disabled == nil then state.disabled = false end
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if state.active == nil then state.active = false end
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-- Scrollbar states
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if state.scrollbarHoveredVertical == nil then state.scrollbarHoveredVertical = false end
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if state.scrollbarHoveredHorizontal == nil then state.scrollbarHoveredHorizontal = false end
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if state.scrollbarDragging == nil then state.scrollbarDragging = false end
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if state.hoveredScrollbar == nil then state.hoveredScrollbar = nil end
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if state.scrollbarDragOffset == nil then state.scrollbarDragOffset = 0 end
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-- Scroll position
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if state.scrollX == nil then state.scrollX = 0 end
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if state.scrollY == nil then state.scrollY = 0 end
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-- Click tracking
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if state._pressed == nil then state._pressed = {} end
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if state._lastClickTime == nil then state._lastClickTime = nil end
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if state._lastClickButton == nil then state._lastClickButton = nil end
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if state._clickCount == nil then state._clickCount = 0 end
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-- Drag tracking
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if state._dragStartX == nil then state._dragStartX = {} end
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if state._dragStartY == nil then state._dragStartY = {} end
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if state._lastMouseX == nil then state._lastMouseX = {} end
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if state._lastMouseY == nil then state._lastMouseY = {} end
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-- Input/focus state
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if state._hovered == nil then state._hovered = nil end
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if state._focused == nil then state._focused = nil end
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if state._cursorPosition == nil then state._cursorPosition = nil end
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if state._selectionStart == nil then state._selectionStart = nil end
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if state._selectionEnd == nil then state._selectionEnd = nil end
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if state._textBuffer == nil then state._textBuffer = "" end
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-- Create metadata
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stateMetadata[id] = {
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lastFrame = frameNumber,
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createdFrame = frameNumber,
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accessCount = 0,
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}
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end
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-- Update metadata
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local meta = stateMetadata[id]
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meta.lastFrame = frameNumber
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meta.accessCount = meta.accessCount + 1
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return stateStore[id]
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end
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--- Set state for an element ID (replaces entire state)
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---@param id string Element ID
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---@param state table State to store
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function StateManager.setState(id, state)
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if not id then
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error("StateManager.setState: id is required")
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end
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stateStore[id] = state
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-- Update or create metadata
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if not stateMetadata[id] then
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stateMetadata[id] = {
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lastFrame = frameNumber,
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createdFrame = frameNumber,
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accessCount = 1,
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}
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else
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stateMetadata[id].lastFrame = frameNumber
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end
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end
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--- Update state for an element ID (merges with existing state)
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---@param id string Element ID
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---@param newState table New state values to merge
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function StateManager.updateState(id, newState)
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local state = StateManager.getState(id)
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-- Track which properties are changing
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local changedProperties = {}
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for key, value in pairs(newState) do
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if state[key] ~= value then
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changedProperties[key] = true
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end
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state[key] = value
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end
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-- Track frame numbers for state changes
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if newState.hover ~= nil then
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state.lastHoverFrame = frameNumber
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end
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if newState.pressed ~= nil then
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state.lastPressedFrame = frameNumber
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end
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if newState.focused ~= nil then
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state.lastFocusFrame = frameNumber
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end
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-- Track last update frame
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state.lastUpdateFrame = frameNumber
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-- Notify listeners of state changes (if any)
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if next(changedProperties) then
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StateManager.notifyStateChange(id, changedProperties, newState)
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end
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end
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--- Get the current state for an element ID
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---@param id string Element ID
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---@return table state State object for the element
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function StateManager.getCurrentState(id)
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return stateStore[id] or {}
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local state = StateManager.getState(id)
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-- Merge new state into existing state
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for key, value in pairs(newState) do
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state[key] = value
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end
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-- Update metadata
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stateMetadata[id].lastFrame = frameNumber
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end
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--- Clear state for a specific element ID
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---@param id string Element ID
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function StateManager.clearState(id)
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stateStore[id] = nil
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stateStore[id] = nil
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stateMetadata[id] = nil
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end
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--- Mark state as used this frame (updates last accessed frame)
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---@param id string Element ID
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function StateManager.markStateUsed(id)
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if stateMetadata[id] then
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stateMetadata[id].lastFrame = frameNumber
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end
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end
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--- Get the last frame number when state was accessed
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---@param id string Element ID
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---@return number|nil frameNumber Last accessed frame, or nil if not found
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function StateManager.getLastAccessedFrame(id)
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if stateMetadata[id] then
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return stateMetadata[id].lastFrame
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end
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return nil
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end
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-- ====================
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-- Frame Management
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-- ====================
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--- Increment frame counter (called at frame start)
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function StateManager.incrementFrame()
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frameNumber = frameNumber + 1
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frameNumber = frameNumber + 1
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-- Reset call site counters for new frame
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callSiteCounters = {}
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end
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--- Get current frame number
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---@return number
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function StateManager.getFrameNumber()
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return frameNumber
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return frameNumber
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end
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-- ====================
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-- Cleanup & Maintenance
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-- ====================
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--- Clean up stale states (not accessed recently)
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---@return number count Number of states cleaned up
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function StateManager.cleanup()
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local cleanedCount = 0
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local retentionFrames = config.stateRetentionFrames
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local cleanedCount = 0
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local retentionFrames = config.stateRetentionFrames
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for id, state in pairs(stateStore) do
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-- Check if state is old (no updates in last N frames)
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local lastUpdateFrame = math.max(
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state.lastHoverFrame,
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state.lastPressedFrame,
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state.lastFocusFrame,
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state.lastUpdateFrame
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)
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if frameNumber - lastUpdateFrame > retentionFrames then
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stateStore[id] = nil
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cleanedCount = cleanedCount + 1
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end
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for id, meta in pairs(stateMetadata) do
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local framesSinceAccess = frameNumber - meta.lastFrame
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if framesSinceAccess > retentionFrames then
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stateStore[id] = nil
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stateMetadata[id] = nil
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cleanedCount = cleanedCount + 1
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end
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end
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return cleanedCount
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return cleanedCount
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end
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--- Force cleanup if state count exceeds maximum
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---@return number count Number of states cleaned up
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function StateManager.forceCleanupIfNeeded()
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local stateCount = 0
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for _ in pairs(stateStore) do
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stateCount = stateCount + 1
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local stateCount = StateManager.getStateCount()
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if stateCount > config.maxStateEntries then
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-- Clean up states not accessed in last 10 frames (aggressive)
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local cleanedCount = 0
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for id, meta in pairs(stateMetadata) do
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local framesSinceAccess = frameNumber - meta.lastFrame
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if framesSinceAccess > 10 then
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stateStore[id] = nil
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stateMetadata[id] = nil
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cleanedCount = cleanedCount + 1
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end
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end
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if stateCount > config.maxStateEntries then
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-- Clean up states not accessed in last 10 frames (aggressive)
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local cleanedCount = 0
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for id, state in pairs(stateStore) do
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local lastUpdateFrame = math.max(
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state.lastHoverFrame,
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state.lastPressedFrame,
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state.lastFocusFrame,
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state.lastUpdateFrame
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)
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if frameNumber - lastUpdateFrame > 10 then
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stateStore[id] = nil
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cleanedCount = cleanedCount + 1
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end
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end
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return cleanedCount
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end
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return 0
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return cleanedCount
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end
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return 0
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end
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--- Get total number of stored states
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---@return number
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function StateManager.getStateCount()
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local count = 0
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for _ in pairs(stateStore) do
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count = count + 1
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end
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return count
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local count = 0
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for _ in pairs(stateStore) do
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count = count + 1
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end
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return count
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end
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--- Clear all states
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function StateManager.clearAllStates()
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stateStore = {}
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stateStore = {}
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stateMetadata = {}
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end
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--- Configure state management
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---@param newConfig {stateRetentionFrames?: number, maxStateEntries?: number}
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function StateManager.configure(newConfig)
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if newConfig.stateRetentionFrames then
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config.stateRetentionFrames = newConfig.stateRetentionFrames
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end
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if newConfig.maxStateEntries then
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config.maxStateEntries = newConfig.maxStateEntries
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end
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if newConfig.stateRetentionFrames then
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config.stateRetentionFrames = newConfig.stateRetentionFrames
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end
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if newConfig.maxStateEntries then
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config.maxStateEntries = newConfig.maxStateEntries
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end
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end
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--- Subscribe to state change events for an element ID
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--- Get state statistics for debugging
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---@return {stateCount: number, frameNumber: number, oldestState: number|nil, newestState: number|nil}
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function StateManager.getStats()
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local stateCount = StateManager.getStateCount()
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local oldest = nil
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local newest = nil
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for _, meta in pairs(stateMetadata) do
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if not oldest or meta.createdFrame < oldest then
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oldest = meta.createdFrame
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end
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if not newest or meta.createdFrame > newest then
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newest = meta.createdFrame
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end
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end
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return {
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stateCount = stateCount,
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frameNumber = frameNumber,
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oldestState = oldest,
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newestState = newest,
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}
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end
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--- Dump all states for debugging
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---@return table states Copy of all states with metadata
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function StateManager.dumpStates()
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local dump = {}
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for id, state in pairs(stateStore) do
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dump[id] = {
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state = state,
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metadata = stateMetadata[id],
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}
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end
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return dump
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end
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||||
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--- Reset the entire state system (for testing)
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||||
function StateManager.reset()
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||||
stateStore = {}
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||||
stateMetadata = {}
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||||
frameNumber = 0
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callSiteCounters = {}
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end
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||||
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||||
-- ====================
|
||||
-- Convenience Functions (for backward compatibility)
|
||||
-- ====================
|
||||
|
||||
--- Get the current state for an element ID (alias for getState)
|
||||
---@param id string Element ID
|
||||
---@param callback fun(id: string, property: string, oldValue: any, newValue: any)
|
||||
function StateManager.subscribe(id, callback)
|
||||
if not stateChangeListeners[id] then
|
||||
stateChangeListeners[id] = {}
|
||||
end
|
||||
table.insert(stateChangeListeners[id], callback)
|
||||
---@return table state State object for the element
|
||||
function StateManager.getCurrentState(id)
|
||||
return stateStore[id] or {}
|
||||
end
|
||||
|
||||
--- Notify listeners of a state change
|
||||
---@param id string Element ID
|
||||
---@param changedProperties table Properties that have changed
|
||||
---@param newState table The new state values
|
||||
function StateManager.notifyStateChange(id, changedProperties, newState)
|
||||
if not stateChangeListeners[id] then return end
|
||||
|
||||
local prevState = StateManager.getCurrentState(id)
|
||||
|
||||
for property, _ in pairs(changedProperties) do
|
||||
local oldValue = prevState[property]
|
||||
local newValue = newState[property]
|
||||
|
||||
for _, callback in ipairs(stateChangeListeners[id]) do
|
||||
callback(id, property, oldValue, newValue)
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
--- Unsubscribe a listener for an element ID
|
||||
---@param id string Element ID
|
||||
---@param callback fun(id: string, property: string, oldValue: any, newValue: any)
|
||||
function StateManager.unsubscribe(id, callback)
|
||||
if not stateChangeListeners[id] then return end
|
||||
|
||||
for i = #stateChangeListeners[id], 1, -1 do
|
||||
if stateChangeListeners[id][i] == callback then
|
||||
table.remove(stateChangeListeners[id], i)
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
--- Get all listeners for debugging
|
||||
---@return table
|
||||
function StateManager.getListeners()
|
||||
return stateChangeListeners
|
||||
end
|
||||
|
||||
--- Get the active state values for an element
|
||||
--- Get the active state values for an element (interaction states only)
|
||||
---@param id string Element ID
|
||||
---@return table state Active state values
|
||||
function StateManager.getActiveState(id)
|
||||
local state = StateManager.getState(id)
|
||||
|
||||
-- Return only the active state properties (not tracking frames)
|
||||
return {
|
||||
hover = state.hover,
|
||||
pressed = state.pressed,
|
||||
focused = state.focused,
|
||||
disabled = state.disabled,
|
||||
active = state.active,
|
||||
scrollbarHoveredVertical = state.scrollbarHoveredVertical,
|
||||
scrollbarHoveredHorizontal = state.scrollbarHoveredHorizontal,
|
||||
scrollbarDragging = state.scrollbarDragging,
|
||||
hoveredScrollbar = state.hoveredScrollbar,
|
||||
scrollbarDragOffset = state.scrollbarDragOffset,
|
||||
}
|
||||
local state = StateManager.getState(id)
|
||||
|
||||
-- Return only the active state properties (not tracking frames or internal state)
|
||||
return {
|
||||
hover = state.hover,
|
||||
pressed = state.pressed,
|
||||
focused = state.focused,
|
||||
disabled = state.disabled,
|
||||
active = state.active,
|
||||
scrollbarHoveredVertical = state.scrollbarHoveredVertical,
|
||||
scrollbarHoveredHorizontal = state.scrollbarHoveredHorizontal,
|
||||
scrollbarDragging = state.scrollbarDragging,
|
||||
hoveredScrollbar = state.hoveredScrollbar,
|
||||
scrollbarDragOffset = state.scrollbarDragOffset,
|
||||
}
|
||||
end
|
||||
|
||||
--- Check if an element is currently hovered
|
||||
---@param id string Element ID
|
||||
---@return boolean
|
||||
function StateManager.isHovered(id)
|
||||
local state = StateManager.getState(id)
|
||||
return state.hover or false
|
||||
local state = StateManager.getState(id)
|
||||
return state.hover or false
|
||||
end
|
||||
|
||||
--- Check if an element is currently pressed
|
||||
---@param id string Element ID
|
||||
---@return boolean
|
||||
function StateManager.isPressed(id)
|
||||
local state = StateManager.getState(id)
|
||||
return state.pressed or false
|
||||
local state = StateManager.getState(id)
|
||||
return state.pressed or false
|
||||
end
|
||||
|
||||
--- Check if an element is currently focused
|
||||
---@param id string Element ID
|
||||
---@return boolean
|
||||
function StateManager.isFocused(id)
|
||||
local state = StateManager.getState(id)
|
||||
return state.focused or false
|
||||
local state = StateManager.getState(id)
|
||||
return state.focused or false
|
||||
end
|
||||
|
||||
--- Check if an element is disabled
|
||||
---@param id string Element ID
|
||||
---@return boolean
|
||||
function StateManager.isDisabled(id)
|
||||
local state = StateManager.getState(id)
|
||||
return state.disabled or false
|
||||
local state = StateManager.getState(id)
|
||||
return state.disabled or false
|
||||
end
|
||||
|
||||
--- Check if an element is active (e.g., input focused)
|
||||
---@param id string Element ID
|
||||
---@return boolean
|
||||
function StateManager.isActive(id)
|
||||
local state = StateManager.getState(id)
|
||||
return state.active or false
|
||||
local state = StateManager.getState(id)
|
||||
return state.active or false
|
||||
end
|
||||
|
||||
--- Get the time since last hover event for an element
|
||||
---@param id string Element ID
|
||||
---@return number secondsSinceLastHover
|
||||
function StateManager.getSecondsSinceLastHover(id)
|
||||
local state = StateManager.getState(id)
|
||||
return (frameNumber - state.lastHoverFrame) / 60 -- Assuming 60fps
|
||||
end
|
||||
|
||||
--- Get the time since last press event for an element
|
||||
---@param id string Element ID
|
||||
---@return number secondsSinceLastPress
|
||||
function StateManager.getSecondsSinceLastPress(id)
|
||||
local state = StateManager.getState(id)
|
||||
return (frameNumber - state.lastPressedFrame) / 60 -- Assuming 60fps
|
||||
end
|
||||
|
||||
return StateManager
|
||||
return StateManager
|
||||
|
||||
Reference in New Issue
Block a user