Merge ticket/010-resizable-sections

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XFUNZwCvz3kcod3352ZR2o

tickets/010-resizable-sections.md

@@ -1,8 +0,0 @@
-# Make layout sections resizable
-
-The sections should be resizable. Currently the log view is too small and can't be resized.
-
-## Acceptance criteria
-- Main layout sections (including the log view) can be resized by the user, e.g. via a drag handle between panes.
-- Resized proportions are reasonably persisted (e.g. in local storage) across reloads, consistent with other UI state persistence in the app.
-- Log view in particular can be enlarged.

webapp/src/App.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useRef, useState, type ReactNode } from 'react'
+import { useEffect, useRef, useState, type PointerEvent as ReactPointerEvent, type ReactNode } from 'react'
 import { NavMenu } from './components/NavMenu'
 import { FilterBar } from './components/FilterBar'
 import { LogTimeline, computeBucketMs, computePresetRange, type TimeRange, type TimeRangePresetId } from './components/LogTimeline'
@@ -22,6 +22,85 @@ import { DocsNavProvider } from './lib/docsNav'
 
 const POLL_MS = 2000
 
+// Height (px) the log viewer had before it became resizable — kept as the default so existing
+// layouts don't jump on first load after this change.
+const DEFAULT_LOG_VIEWER_HEIGHT_PX = 352
+const MIN_LOG_VIEWER_HEIGHT_PX = 200
+// Leaves room below the log viewer for the drag handle and at least a sliver of the next
+// section, so a drag can never grow it to swallow the whole viewport.
+const LOG_VIEWER_HEIGHT_VIEWPORT_MARGIN_PX = 160
+
+// Namespaced under `ottyl.` per the app's existing localStorage convention (see
+// CollapsibleSection.tsx's COLLAPSED_SECTIONS_STORAGE_KEY, LogPreview.tsx's
+// VISIBLE_PARAM_COLUMNS_STORAGE_KEY).
+const LOG_VIEWER_HEIGHT_STORAGE_KEY = 'ottyl.logViewerHeightPx'
+
+function clampLogViewerHeight(px: number): number {
+  const max = Math.max(MIN_LOG_VIEWER_HEIGHT_PX, window.innerHeight - LOG_VIEWER_HEIGHT_VIEWPORT_MARGIN_PX)
+  return Math.min(max, Math.max(MIN_LOG_VIEWER_HEIGHT_PX, px))
+}
+
+function loadLogViewerHeight(): number {
+  try {
+    const raw = localStorage.getItem(LOG_VIEWER_HEIGHT_STORAGE_KEY)
+    if (!raw) return DEFAULT_LOG_VIEWER_HEIGHT_PX
+    const parsed = Number(raw)
+    return Number.isFinite(parsed) ? clampLogViewerHeight(parsed) : DEFAULT_LOG_VIEWER_HEIGHT_PX
+  } catch {
+    return DEFAULT_LOG_VIEWER_HEIGHT_PX
+  }
+}
+
+function saveLogViewerHeight(px: number) {
+  try {
+    localStorage.setItem(LOG_VIEWER_HEIGHT_STORAGE_KEY, String(px))
+  } catch {
+    // best-effort — private browsing or full storage just means the size won't persist across reloads
+  }
+}
+
+/// Thin drag handle between the log viewer and the sections below it. Reports each pointer-move
+/// delta via `onResize` (letting the caller clamp/apply it) and fires `onResizeEnd` on release so
+/// the final size can be persisted once, not on every pixel of movement.
+function ResizeHandle({ onResize, onResizeEnd }: { onResize: (deltaY: number) => void; onResizeEnd: () => void }) {
+  const draggingRef = useRef(false)
+
+  function handlePointerDown(e: ReactPointerEvent) {
+    e.preventDefault()
+    draggingRef.current = true
+    let lastY = e.clientY
+
+    function handlePointerMove(ev: PointerEvent) {
+      if (!draggingRef.current) return
+      onResize(ev.clientY - lastY)
+      lastY = ev.clientY
+    }
+
+    function handlePointerUp() {
+      draggingRef.current = false
+      window.removeEventListener('pointermove', handlePointerMove)
+      window.removeEventListener('pointerup', handlePointerUp)
+      onResizeEnd()
+    }
+
+    window.addEventListener('pointermove', handlePointerMove)
+    window.addEventListener('pointerup', handlePointerUp)
+  }
+
+  return (
+    <div
+      role="separator"
+      aria-orientation="horizontal"
+      aria-label="Resize log viewer"
+      title="Drag to resize"
+      onPointerDown={handlePointerDown}
+      className="group relative h-1.5 shrink-0 cursor-ns-resize touch-none"
+    >
+      <div className="absolute inset-x-0 top-1/2 h-px -translate-y-1/2 bg-border-soft group-hover:bg-border-strong" />
+    </div>
+  )
+}
+
 /// Reads the routing params `PopOutButton` writes: `section` picks which primary section to render full-page, and `startMs`/`endMs` carry over the range for sections with no `LogTimeline` of their own to pick one.
 function parsePopOutQuery(): { section: PopOutSectionId | null; range: TimeRange | null } {
   const query = new URLSearchParams(window.location.search)
@@ -190,6 +269,18 @@ function FullApp() {
   const [filter, setFilter] = useState('')
   const [filterError, setFilterError] = useState<string | null>(null)
   const [logViewerCollapsed, setLogViewerCollapsed] = useSectionCollapsed('log-viewer')
+  const [logViewerHeight, setLogViewerHeight] = useState(() => loadLogViewerHeight())
+
+  function handleLogViewerResize(deltaY: number) {
+    setLogViewerHeight((current) => clampLogViewerHeight(current + deltaY))
+  }
+
+  function handleLogViewerResizeEnd() {
+    setLogViewerHeight((current) => {
+      saveLogViewerHeight(current)
+      return current
+    })
+  }
 
   // Read via ref inside the poll loop instead of depending on `range` directly, which would restart the interval every rolling-preset tick.
   const rangeRef = useRef(range)
@@ -289,8 +380,14 @@ function FullApp() {
               </>
             }
           />
-          {/* min-h-[...] keeps this from being squeezed to 0 by the sections below it in the shared scroll container — flex-1 alone lets a flex item shrink past its content, which let this section's absolutely-unclipped content spill over Params et al instead of the column just scrolling. */}
-          <div className="flex min-h-[22rem] flex-1 flex-col" hidden={logViewerCollapsed}>
+          {/* An explicit height (user-resizable via the handle below, persisted to localStorage) keeps this
+              from being squeezed by the sections below it in the shared scroll container, and bounds
+              LogPreview's own internal `flex-1 overflow-auto` scroll area. */}
+          <div
+            className="flex shrink-0 flex-col overflow-hidden"
+            style={{ height: logViewerHeight }}
+            hidden={logViewerCollapsed}
+          >
             <LogTimeline
               buckets={buckets}
               range={range}
@@ -300,6 +397,7 @@ function FullApp() {
             />
             <LogPreview logs={logs} params={params} />
           </div>
+          {!logViewerCollapsed && <ResizeHandle onResize={handleLogViewerResize} onResizeEnd={handleLogViewerResizeEnd} />}
           <Params params={params} onDeclared={loadParams} />
           <Metrics range={range} />
           <Dashboards range={range} />