IPlayModeController (Engine.Editor.Contracts) wraps IWorld.Snapshot()/
Restore() as EnterPlay/ExitPlay — the entire mechanism is that one
snapshot, per Snapshot's own doc comment. Exposed as a service, not just
something engine.editor's UI calls directly, so a future non-UI driver
(a test harness, a headless "play for N frames" CLI command) can drive
Play mode without depending on ImGui.
Engine.Host now looks up IPlayModeController once and checks IsPlaying
every frame before running Stage.Update: Edit mode still renders the
scene (so the view isn't frozen and the editor UI stays responsive) but
never ticks it, same distinction Unity draws between its Scene and Game
views. A project with no engine.editor loaded sees no behavior change —
Update runs unconditionally, same as before this existed.
Added "play"/"stop" as stdin commands alongside the existing "r" and
"screenshot", both real controls (not just test scaffolding) for driving
Play mode without a mouse — which is also how this got verified: an
interactive run sent "play", screenshotted, sent "stop", and the log
shows "Entered Play mode in 13.2ms", the real editor path exercising the
same under-100ms budget WorldSnapshotTests already proves at the kernel
level. The Lingua Editor panel's button/label flip Play/(Edit mode) to
Stop/(Playing) correctly across both screenshots.
Also fixes a real layout bug hit while verifying this: SetNextWindowPos
with ImGuiCond.FirstUseEver only applies with no prior imgui.ini entry
for that window title, and this project had already accumulated one from
earlier runs (all three panels stacked exactly on top of each other) —
gave each panel its own default position and .gitignore'd imgui.ini,
which is per-machine session state, not source.
Full suite still green: 65 tests.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N1qPfzq8TDCUMFMV3UwV5N
InspectorPanel shows EditorState.Selected's Transform (Position/Scale as
draggable Vector3 widgets, Rotation shown read-only as a quaternion — a
real rotate control needs Euler conversion or a gizmo, out of scope for
just the Inspector) and, below it, every attached Component's public
fields via reflection. No per-component-type drawer code exists anywhere:
int/float/bool/string/Vector3 fields get a live-editable widget, anything
else falls back to a read-only ToString(), and a brand new component type
in any plugin gets an Inspector for free the moment it's attached — that
genericity is the entire reason to do this by reflection instead of a
registry.
Field edits write straight back through FieldInfo.SetValue, same gap
GameObject.AddComponent's doc comment already names: components are plain
fields with nothing to intercept a direct mutation, so this needs no
SystemAccessScope declaration any more than a hand-written `component.
Value = 5` would.
EditorPlugin now defaults EditorState.Selected to the first root once,
if nothing's been clicked yet — an empty Inspector on every fresh launch
had nothing useful to show. Verified by screenshot: Inspector displays
"Quad"'s real Position (0,0,0) and Scale (2,2,1), matching scene.json
exactly, plus a QuadRenderer header correctly showing "(no fields)" since
it has none yet.
Full suite still green: 65 tests.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N1qPfzq8TDCUMFMV3UwV5N
