Drawer & Floating Panel System for TMNL

Overview

A comprehensive panel management system with:

• Drawer Stack — Rolodex-style stacking with parallax lift animations
• Floating Panels — stx-powered state machines with 8-direction resize
• Global/Panel Slots — Composable content injection system
• Motion Blur — Velocity-based blur effects during drag
• Persistence — localStorage-backed panel geometry

Canonical Sources

TMNL Implementations

src/lib/drawer/Drawer.tsx

src/lib/drawer/DrawerStackContext.tsx

src/lib/drawer/GlobalSlot.tsx

src/lib/drawer/PanelSlot.tsx

src/lib/drawer/animations/rolodex.ts

src/lib/drawer/animations/parallax-lift.ts

src/lib/floating/FloatingPanel.tsx

src/lib/floating/floating-stx.ts

src/lib/floating/withDraggable.tsx

src/lib/floating/ResizeHandles.tsx

Testbeds

• DrawerTestbed:

  /testbed/drawer

  — Rolodex stack, slot injection
• FloatingPanelTestbed:

  /testbed/floating

  — Drag, resize, persistence

Pattern 1: Drawer Stack Management — ROLODEX PATTERN

When: Managing multiple stacked drawers with animated transitions.

The drawer stack uses a LIFO (Last-In-First-Out) model with visual stacking:

import { createContext, useContext, useReducer } from 'react'

interface DrawerState {
  drawers: DrawerInstance[]
  activeId: string | null
}

type DrawerAction =
  | { type: 'PUSH'; drawer: DrawerInstance }
  | { type: 'POP' }
  | { type: 'POP_TO'; id: string }
  | { type: 'REPLACE'; drawer: DrawerInstance }

const drawerReducer = (state: DrawerState, action: DrawerAction): DrawerState => {
  switch (action.type) {
    case 'PUSH':
      return {
        drawers: [...state.drawers, action.drawer],
        activeId: action.drawer.id,
      }
    case 'POP':
      const popped = state.drawers.slice(0, -1)
      return {
        drawers: popped,
        activeId: popped[popped.length - 1]?.id ?? null,
      }
    case 'POP_TO': {
      const idx = state.drawers.findIndex(d => d.id === action.id)
      if (idx === -1) return state
      const remaining = state.drawers.slice(0, idx + 1)
      return {
        drawers: remaining,
        activeId: action.id,
      }
    }
    case 'REPLACE': {
      const replaced = [...state.drawers.slice(0, -1), action.drawer]
      return {
        drawers: replaced,
        activeId: action.drawer.id,
      }
    }
  }
}

const DrawerStackContext = createContext<{
  state: DrawerState
  dispatch: React.Dispatch<DrawerAction>
} | null>(null)

TMNL Location:

src/lib/drawer/DrawerStackContext.tsx

Pattern 2: Parallax Stack Animation — DEPTH EFFECTS

When: Creating visual depth with offset and scale transformations.

import { gsap } from 'gsap'

interface ParallaxConfig {
  offsetY: number      // Vertical offset per layer (px)
  scaleDecay: number   // Scale reduction per layer (0-1)
  opacityDecay: number // Opacity reduction per layer (0-1)
}

const DEFAULT_CONFIG: ParallaxConfig = {
  offsetY: 20,
  scaleDecay: 0.02,
  opacityDecay: 0.15,
}

function applyParallaxStack(
  drawers: HTMLElement[],
  config: ParallaxConfig = DEFAULT_CONFIG
) {
  const active = drawers.length - 1

  drawers.forEach((el, idx) => {
    const depth = active - idx  // 0 = active, 1+ = behind

    gsap.to(el, {
      y: -depth * config.offsetY,
      scale: 1 - depth * config.scaleDecay,
      opacity: 1 - depth * config.opacityDecay,
      duration: 0.3,
      ease: 'power2.out',
    })
  })
}

Key Formula:

transform: translateY(${-depth * offsetY}px) scale(${1 - depth * scaleDecay})

TMNL Location:

src/lib/drawer/animations/parallax-lift.ts

Pattern 3: TableService Integration — DATA-AWARE DRAWERS

When: Connecting drawers to data sources via table-service.

import { TableService } from '@/lib/table-service'

interface DataDrawerProps<T> {
  tableService: TableService<T>
  rowId: string
  children: (data: T) => React.ReactNode
}

function DataDrawer<T>({ tableService, rowId, children }: DataDrawerProps<T>) {
  const row = useTableRow(tableService, rowId)

  if (!row) return null

  return (
    <Drawer id={`data-${rowId}`} title={`Row ${rowId}`}>
      {children(row)}
    </Drawer>
  )
}

// Usage
<DataDrawer tableService={assetService} rowId="asset-123">
  {(asset) => (
    <div>
      <h2>{asset.name}</h2>
      <AssetDetails asset={asset} />
    </div>
  )}
</DataDrawer>

TMNL Location: Integration pattern documented in

src/lib/table-service/

Pattern 4: stx-Powered Floating Panels — HYBRID STATE

When: Managing complex panel state with Legend-State reactivity + XState machines.

The "stx" pattern combines:

• Legend-State — Fine-grained reactive state (position, size)
• XState — Lifecycle state machine (idle, dragging, resizing)

import { observable } from '@legendapp/state'
import { setup, createActor } from 'xstate'

// Legend-State for reactive data
const panelState = observable({
  panels: new Map<string, PanelState>(),
  zOrder: [] as string[],
})

// XState for lifecycle
const panelMachine = setup({
  types: {
    context: {} as { panelId: string; initialPos: Position },
    events: {} as
      | { type: 'DRAG_START'; x: number; y: number }
      | { type: 'DRAG_MOVE'; x: number; y: number }
      | { type: 'DRAG_END' }
      | { type: 'RESIZE_START'; edge: ResizeEdge }
      | { type: 'RESIZE_MOVE'; x: number; y: number }
      | { type: 'RESIZE_END' },
  },
}).createMachine({
  id: 'panel',
  initial: 'idle',
  states: {
    idle: {
      on: {
        DRAG_START: 'dragging',
        RESIZE_START: 'resizing',
      },
    },
    dragging: {
      on: {
        DRAG_MOVE: { actions: 'updatePosition' },
        DRAG_END: 'idle',
      },
    },
    resizing: {
      on: {
        RESIZE_MOVE: { actions: 'updateSize' },
        RESIZE_END: 'idle',
      },
    },
  },
})

// Combine into stx
const getFloatingStx = () => ({
  data: panelState,
  machine: panelMachine,
  computed: {
    topPanel: () => panelState.zOrder.get()[panelState.zOrder.get().length - 1],
    motionBlurStyle: (velocity: number) => ({
      filter: `blur(${Math.min(velocity * 0.1, 4)}px)`,
    }),
  },
  effects: {
    persist: () => {
      localStorage.setItem('panels', JSON.stringify(panelState.get()))
    },
    restore: () => {
      const saved = localStorage.getItem('panels')
      if (saved) panelState.set(JSON.parse(saved))
    },
  },
})

TMNL Location:

src/lib/floating/floating-stx.ts

Pattern 5: FloatingPanel Component — 8-DIRECTION RESIZE

When: Creating resizable, draggable floating panels.

import { useFloatingPanel } from './hooks/useFloatingPanel'
import { ResizeHandles } from './ResizeHandles'

interface FloatingPanelProps {
  id: string
  title: string
  initialPosition?: Position
  initialSize?: Size
  minSize?: Size
  maxSize?: Size
  children: React.ReactNode
}

function FloatingPanel({
  id,
  title,
  initialPosition = { x: 100, y: 100 },
  initialSize = { width: 320, height: 240 },
  minSize = { width: 200, height: 150 },
  maxSize,
  children,
}: FloatingPanelProps) {
  const {
    position,
    size,
    zIndex,
    isDragging,
    isResizing,
    handleDragStart,
    handleResizeStart,
    bringToFront,
  } = useFloatingPanel(id, { initialPosition, initialSize })

  return (
    <div
      className="floating-panel"
      style={{
        position: 'fixed',
        left: position.x,
        top: position.y,
        width: size.width,
        height: size.height,
        zIndex,
      }}
      onPointerDown={bringToFront}
    >
      {/* Title bar (drag handle) */}
      <div
        className="panel-titlebar"
        onPointerDown={handleDragStart}
      >
        {title}
      </div>

      {/* Content */}
      <div className="panel-content">
        {children}
      </div>

      {/* Resize handles */}
      <ResizeHandles
        onResizeStart={handleResizeStart}
        minSize={minSize}
        maxSize={maxSize}
      />
    </div>
  )
}

TMNL Location:

src/lib/floating/FloatingPanel.tsx

Pattern 6: withDraggable HOC — POINTER EVENT MANAGEMENT

When: Adding drag behavior to any component.

import { useCallback, useRef, useState } from 'react'

interface DraggableOptions {
  onDragStart?: (pos: Position) => void
  onDrag?: (pos: Position, delta: Position) => void
  onDragEnd?: (pos: Position) => void
  constraint?: 'none' | 'horizontal' | 'vertical' | DOMRect
}

function withDraggable<P extends object>(
  Component: React.ComponentType<P>,
  options: DraggableOptions = {}
) {
  return function DraggableComponent(props: P) {
    const [isDragging, setIsDragging] = useState(false)
    const startPos = useRef<Position>({ x: 0, y: 0 })
    const currentPos = useRef<Position>({ x: 0, y: 0 })

    const handlePointerDown = useCallback((e: React.PointerEvent) => {
      e.preventDefault()
      e.currentTarget.setPointerCapture(e.pointerId)

      startPos.current = { x: e.clientX, y: e.clientY }
      currentPos.current = { x: e.clientX, y: e.clientY }
      setIsDragging(true)

      options.onDragStart?.(startPos.current)
    }, [])

    const handlePointerMove = useCallback((e: React.PointerEvent) => {
      if (!isDragging) return

      const delta = {
        x: e.clientX - currentPos.current.x,
        y: e.clientY - currentPos.current.y,
      }
      currentPos.current = { x: e.clientX, y: e.clientY }

      options.onDrag?.(currentPos.current, delta)
    }, [isDragging])

    const handlePointerUp = useCallback((e: React.PointerEvent) => {
      e.currentTarget.releasePointerCapture(e.pointerId)
      setIsDragging(false)

      options.onDragEnd?.(currentPos.current)
    }, [])

    return (
      <Component
        {...props}
        onPointerDown={handlePointerDown}
        onPointerMove={handlePointerMove}
        onPointerUp={handlePointerUp}
        data-dragging={isDragging}
      />
    )
  }
}

TMNL Location:

src/lib/floating/withDraggable.tsx

Pattern 7: Container Queries — RESPONSIVE PANELS

When: Adapting panel content to available space.

// Use container queries for panel-intrinsic sizing
function ResponsivePanelContent({ children }: { children: React.ReactNode }) {
  return (
    <div className="@container panel-content">
      <div className="@[200px]:grid-cols-1 @[400px]:grid-cols-2 @[600px]:grid-cols-3 grid gap-4">
        {children}
      </div>
    </div>
  )
}

// CSS (Tailwind container queries)
// @container panel-content (min-width: 400px) { ... }

Alternative: FloatingDimensionContext

import { createContext, useContext } from 'react'

const FloatingDimensionContext = createContext<Size>({ width: 320, height: 240 })

function FloatingPanel({ size, children }) {
  return (
    <FloatingDimensionContext.Provider value={size}>
      {children}
    </FloatingDimensionContext.Provider>
  )
}

function PanelContent() {
  const { width, height } = useContext(FloatingDimensionContext)

  // Adapt to available dimensions
  const columns = width < 300 ? 1 : width < 500 ? 2 : 3
  return <Grid columns={columns}>...</Grid>
}

TMNL Location:

src/lib/floating/FloatingDimensionContext.tsx

Pattern 8: Motion Blur — VELOCITY-BASED EFFECTS

When: Adding motion blur during fast drag operations.

const calculateMotionBlur = (velocity: number): string => {
  // velocity = pixels/frame
  const blurAmount = Math.min(velocity * 0.15, 8)  // Cap at 8px
  const direction = velocity > 0 ? 'horizontal' : 'vertical'

  if (blurAmount < 0.5) return 'none'

  return `blur(${blurAmount}px)`
}

// In drag handler
const handleDrag = (e: PointerEvent) => {
  const velocity = Math.sqrt(
    Math.pow(e.movementX, 2) + Math.pow(e.movementY, 2)
  )

  panelRef.current.style.filter = calculateMotionBlur(velocity)
}

const handleDragEnd = () => {
  // Animate blur removal
  gsap.to(panelRef.current, {
    filter: 'blur(0px)',
    duration: 0.2,
  })
}

TMNL Location:

src/lib/floating/floating-stx.ts

Pattern 9: Panel Persistence — LOCALSTORAGE GEOMETRY

When: Remembering panel positions/sizes across sessions.

import { useEffect } from 'react'

const STORAGE_KEY = 'tmnl:panel-geometry'

interface PersistedPanel {
  id: string
  position: Position
  size: Size
  zIndex: number
}

const usePanelPersistence = (panelId: string) => {
  const loadGeometry = (): PersistedPanel | null => {
    const stored = localStorage.getItem(STORAGE_KEY)
    if (!stored) return null

    const panels: Record<string, PersistedPanel> = JSON.parse(stored)
    return panels[panelId] ?? null
  }

  const saveGeometry = (geometry: Omit<PersistedPanel, 'id'>) => {
    const stored = localStorage.getItem(STORAGE_KEY)
    const panels: Record<string, PersistedPanel> = stored ? JSON.parse(stored) : {}

    panels[panelId] = { id: panelId, ...geometry }
    localStorage.setItem(STORAGE_KEY, JSON.stringify(panels))
  }

  // Debounced save during drag/resize
  const debouncedSave = useMemo(
    () => debounce(saveGeometry, 200),
    [panelId]
  )

  return { loadGeometry, saveGeometry: debouncedSave }
}

TMNL Location:

src/lib/floating/hooks/usePanelPersistence.ts

Pattern 10: Global vs Panel Slots — CONTENT INJECTION

When: Injecting content at different levels of the drawer hierarchy.

import { createContext, useContext } from 'react'

// Global slot: content appears in all drawers
const GlobalSlotContext = createContext<React.ReactNode>(null)

function GlobalSlot({ children }: { children: React.ReactNode }) {
  return (
    <GlobalSlotContext.Provider value={children}>
      {children}
    </GlobalSlotContext.Provider>
  )
}

// Panel slot: content scoped to specific drawer
const PanelSlotContext = createContext<Map<string, React.ReactNode>>(new Map())

function PanelSlot({
  name,
  children,
}: {
  name: string
  children: React.ReactNode
}) {
  const slots = useContext(PanelSlotContext)
  slots.set(name, children)
  return null
}

// Usage in drawer
function Drawer({ id, children }) {
  const globalContent = useContext(GlobalSlotContext)
  const [slots] = useState(() => new Map())

  return (
    <PanelSlotContext.Provider value={slots}>
      <div className="drawer">
        {/* Global slot renders in header */}
        <div className="drawer-header">{globalContent}</div>

        {/* Main content */}
        <div className="drawer-content">{children}</div>

        {/* Named slots render in footer */}
        <div className="drawer-footer">{slots.get('footer')}</div>
      </div>
    </PanelSlotContext.Provider>
  )
}

// Consumer
<GlobalSlot>
  <Breadcrumbs />
</GlobalSlot>

<Drawer id="details">
  <AssetDetails />
  <PanelSlot name="footer">
    <ActionButtons />
  </PanelSlot>
</Drawer>

TMNL Location:

src/lib/drawer/GlobalSlot.tsx

src/lib/drawer/PanelSlot.tsx

Decision Tree: Component Selection

What are you building?
│
├─ Stacked content panels?
│  ├─ Sequential navigation? → Drawer Stack (Pattern 1)
│  └─ Depth effect? → Parallax Stack (Pattern 2)
│
├─ Floating window?
│  ├─ Resizable + draggable? → FloatingPanel (Pattern 5)
│  └─ Just draggable? → withDraggable HOC (Pattern 6)
│
├─ Complex state with animations?
│  └─ stx-Powered Panels (Pattern 4)
│
├─ Remember panel positions?
│  └─ Panel Persistence (Pattern 9)
│
└─ Content injection?
   ├─ All drawers? → GlobalSlot
   └─ Specific drawer? → PanelSlot

Anti-Patterns

Don't: Use transform-origin incorrectly for stacking

// BANNED - Scale from wrong origin causes visual jump
style={{ transform: `scale(${1 - depth * 0.02})` }}

// CORRECT - Scale from top center for card-like effect
style={{
  transformOrigin: 'top center',
  transform: `scale(${1 - depth * 0.02})`,
}}

Don't: Store panel position in useState during drag

// BANNED - Too many re-renders during drag
const [position, setPosition] = useState({ x: 0, y: 0 })
onDrag={(pos) => setPosition(pos)}  // 60+ re-renders/sec

// CORRECT - Use refs for drag, sync state on end
const posRef = useRef({ x: 0, y: 0 })
onDrag={(pos) => { posRef.current = pos }}
onDragEnd={() => setPosition(posRef.current)}

Don't: Forget pointer capture

// BANNED - Drag breaks if pointer leaves element
onPointerDown={() => setDragging(true)}

// CORRECT - Capture pointer for reliable tracking
onPointerDown={(e) => {
  e.currentTarget.setPointerCapture(e.pointerId)
  setDragging(true)
}}

Integration Points

Depends on:

• xstate-integration

  — Panel lifecycle machines

• tmnl-animation-tokens

  — Animation timings

• react-hoc-patterns

  — withDraggable HOC

Used by:

• ag-grid-patterns

  — Detail panels for grid rows

• tmnl-registry-patterns

  — Overlay system

Quick Reference