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OneCAD/docs/control-protocol.md
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bherbruckandClaude Opus 5.5 2cac9cad6a Toolbar: drag commands from drop-downs onto the toolbar; pin icon; Customize Toolbar… (#295)
* Toolbar drop-downs highlight the row under the pointer and the keyboard focus (#288)

A panel drop-down's command rows are full-width rows that take the theme's hover background
(icon, label and shortcut on it) when hovered or focused. Up/Down move the focus through the
enabled rows, Enter starts the command, Escape closes the drop-down. Rows publish
`dropdown:<id>` and the highlighted one `dropdown_hot:<id>`; scenario s46 checks pointer and
keyboard highlight.

Fixes #288

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RjGw4gA5ZvKrU8MQP6sBgT

* Toolbar: drag commands from drop-downs onto the toolbar; pin icon; Customize Toolbar… (#289)

- A panel drop-down row drags onto the toolbar (a button or a panel's free space, with the
  drop line) and is pinned there; the dragged command's icon follows the pointer.
- A toolbar button dragged off the toolbar, or back into the open drop-down, leaves it (its
  icon shows a cross while releasing would remove it).
- A hovered drop-down row shows a pin at its end: click to pin or unpin.
- Right-click on the toolbar's empty space: Customize Toolbar… (a window listing the tab's
  commands with check boxes, and Reset Toolbar) and Reset Toolbar; command menus have
  Customize Toolbar… too.
- Still per workspace and tab, kept with the preferences. Toolbar buttons also publish
  `button:<id>`; scenario s47 drags a row to the toolbar, unpins by dragging off and into the
  drop-down, uses the pin icon and Customize Toolbar…, and checks it survives a restart.

Fixes #289

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RjGw4gA5ZvKrU8MQP6sBgT

* Toolbar drop-down pin: a push pin drawn in code (upright and filled when pinned); control protocol lists the toolbar handles

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RjGw4gA5ZvKrU8MQP6sBgT

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-12 10:27:25 -04:00

108 lines
11 KiB
Markdown

# Control protocol
`solvecraft --control PORT` (or `SOLVECRAFT_CONTROL_PORT=PORT`) listens on `127.0.0.1:PORT` for
JSON lines. Each request is one line `{"id": …, "method": "…", "params": {…}}`; each reply is one
line `{"id": …, "ok": true, "result": …}` or `{"id": …, "ok": false, "error": "…"}`. Requests are
handled on the UI thread between frames; pointer and keyboard input is injected as real egui
events, one pointer event per frame.
The channel is untrusted input. A request line may be at most 16 MiB; a longer one is answered
with `{"ok": false, "error": "request too large"}` and the connection is closed, as are
connections that send eight lines that are not JSON. At most 16 connections are served at once
(further ones get `{"ok": false, "error": "too many connections"}`), at most 64 queued requests
run per frame so a flood cannot starve drawing, and a request that the UI thread has not
answered within 60 seconds is replied to with `{"ok": false, "error": "timeout"}`. The same
16 MiB line limit applies to the MCP server.
## Engine
| Method | Params | Result |
|---|---|---|
| `engine.execute` | `command`: command id, `params`: JSON object | the command's result |
| `engine.script` | `commands`: `[{command, params}, …]` | results, stops at the first error |
| `engine.commands` | — | every command: id, label, tab, panel, icon, shortcut, params doc, enabled |
| `document.inspect` | `measure?`: bool | parameters, timeline (errors, timings), bodies, sketches, selection |
Commands never open dialogs when run this way. `solvecraft-cli commands` prints the same registry.
Every `sketch.*` command that changes a sketch adds `created: {points, curves, constraints,
dimensions}` to its result (and `wires` for 3D curves): the ids of what it added, in creation
order, next to whatever else the command returns (`curves`, `sides`, `corners`…). Sketch ids are
stable and never reused, even after a delete (`l1`, `l2`, then `l3` once `l2` is gone; only undo
rolls the numbering back with the design), so they can go straight into later commands:
```text
{"id":7,"method":"engine.execute","params":{"command":"sketch.line","params":{"points":[[0,0],[40,0]]}}}
→ {"curves":["l1"],"created":{"points":["l1.start","l1.end"],"curves":["l1"],"constraints":["k1"],"dimensions":[]},…}
{"id":8,"method":"engine.execute","params":{"command":"sketch.dimension","params":{"entities":["l1"],"value":50}}}
```
A bare numeric `value` given to `sketch.dimension` (from the control channel, scripts or MCP) is
read in the design's units, exactly as if it were typed into the dimension box: in an inch design
`"value": 2` makes the line 2 in (50.8 mm) long. Point coordinates stay in millimetres. To pin a
unit regardless of the design, pass an expression with one: `"value": "50 mm"` or
`"value": "0.5 in"`. Angles are degrees unless the expression says otherwise.
## UI
| Method | Params | Notes |
|---|---|---|
| `ui.inspect` | — | UI state, what is hidden (`visibility`: bodies, origin and construction items, sketches; set it with the `browser.visibility` command), viewport rect, camera, active tool/dialog, hover, renderer, timings, live preview (`active`, `busy`, `error`, `ms`, bodies it stands in for) |
| `ui.set` | any `UiState` field (`tab`, `perspective`, `showGrid`, `dark`, …), and `hiddenBodies`, `hiddenOrigin`, `hiddenSketches`, `shownSketches` (whole lists; `browser.visibility` changes single items) | `dark: false` switches to the light theme |
| `ui.view` | `view`: `front`, `back`, `top`, `bottom`, `left`, `right`, `iso`, `home`, `fit`; `animate` (bool, default false: snap) | |
| `ui.start` | `command` | like a toolbar click: starts the sketch tool or dialog for the command |
| `ui.click` | `x`, `y` (screen points), `button?`: left/right/middle, `shift?`, `ctrl?`, `double?` | real pointer input |
| `ui.move` | `x`, `y` | |
| `ui.drag` | `x0`, `y0`, `x1`, `y1`, `button?`, `shift?`, `ctrl?`, `steps?`, `hold?`, `hold_end?` | press, move, release; a left drag on the model is a box selection (left to right: window, right to left: crossing); `hold` keeps the button down that many frames first (a right press-and-hold opens the marking menu, releasing over a direction picks it), `hold_end` that many frames at the end (a sketch drag shows its snap) |
| `ui.menu` | `x?`, `y?`, `target?`, `close?` | with a point: open a context menu there as a right-click would (the viewport's marking menu, or a browser menu with `target: {"type": "body", "name"} \| {"type": "sketch", "id"} \| {"type": "component", "id"}`); without: the open menu (`radial` and `items`: id, label, shortcut, enabled) |
| `ui.menuPick` | `item`: id or label | runs an item of the open menu, as clicking it does |
| `ui.rename` | `text?`, `commit?` (default true) | finishes the rename box a Rename item opened |
| `ui.selection` | | the selection, the open dialog's inputs, the hovered item, and the active sketch's drawn dimensions (`dimensions`: id and text centre, `dimension_selected`, `dimension_editing`) |
| `ui.worldToScreen` | `points`: `[[x, y, z]…]` world points | their screen points |
| `ui.triad` | | screen points of the 3D sketch move triad's handles (`x`, `y`, `z`, `plane`) |
| `ui.sketchToScreen` | `points`: `[[x, y]…]` in active-sketch coordinates | their screen points (null when behind the camera) |
| `ui.dialogInput` | `index` | what clicking an input's Select chip does: picks go to that input |
| `ui.at` | `world: [x,y,z]` \| `sketch: [x,y]` \| `plane: "XY"` \| `axis: "Z"` \| `dimension: "d1"` (its value text) \| `handle: "arrow"` (a manipulator handle, see `scenario::publish_handle`) | the screen point (a scenario step's target; see `crates/ui-egui/src/scenario.rs`) |
| `ui.handles` | `prefix?` | the handles drawn last frame, `[{name, x, y}]`: toolbar buttons and drop-down items `toolbar:<command id>` (the button alone: `button:<command id>`; a drop-down row: `dropdown:<command id>`, highlighted `dropdown_hot:<command id>`, its pin `dropdown_pin:<command id>`; Customize Toolbar's check boxes `customize:<command id>`), panel labels `panel:<tab>:<panel>`, browser rows `row:<label>` and fold arrows `fold:<label>`, manipulator handles; orientation tips `axis_view:x`, `axis_view:-x` (and y/z) |
| `ui.editFeature` | `feature` (id or name) | what double-clicking a timeline item does: rolls back to it and opens its dialog filled in (sketches open in sketch mode) |
| `ui.scroll` | `x`, `y`, `delta?` | wheel zoom at the cursor |
| `ui.key` | `key` (egui key name, `Enter`, `Escape`…), `cmd?`, `shift?` | |
| `ui.text` | `text` | typed text |
| `ui.screenshot` | `path?` | PNG of the window (needs a presented frame) |
| `ui.render` | `path`, `width?`, `height?` | CPU render of the model with the current camera (no window needed); cut by the section the viewport shows (`inspect.section`, an open Section Analysis dialog's preview, a sketch's Slice), with the cut face capped |
| `ui.confirm` | `accept?`: bool | answers the Delete confirmation (shown when a delete takes other features with it or makes some fail); without `accept`, what it lists |
| `ui.documents` | `action?`: `new`, `switch`, `close`, `quit`; `index?`; `force?` (close without asking); `answer?`: `save`, `dont_save`, `cancel` (answers "save changes?") | the open designs (tabs): names, unsaved flags, the active one, a pending "save changes?" prompt, whether a quit is asking |
| `ui.file` | `path`; `insert?`: bool | starts an interactive background Open or Insert; poll `ui.inspect.file_busy` for completion; the window stays responsive |
| `ui.home` | `open?`: bool; `sample?`: index | the start page: show or hide it, open a built-in sample (once built); returns `open` and the recent designs |
| `ui.shortcut` | `command`, `key?`, `replace?` | a command's key, or rebinds it (`""` clears; a key another command uses is refused unless `replace`) |
| `ui.help` | `item?`: `about`, `shortcuts` (read only), `report` (copies diagnostics) | the version, commit, build date and diagnostic text |
| `ui.prefs` | any of `default_units`, `nav` (`fusion`, `solidworks`, `inventor`, `alias`, `tinkercad`), `zoom_reverse`, `zoom_to_cursor`, `smooth_wheel_zoom` (default true), `orbit_cursor`, `look_at_anim`, `look_at_speed`, `msaa`, `length_decimals`, `angle_decimals`, `theme` (`dark`, `light`, `system`), `language` (`en`, `ja`; see [localization](localization.md)), `ui_scale`, `up_axis` (`z`, `y`), `offer_stand_up`; `open` (a page: General, Navigation, Keyboard Shortcuts, Design, Graphics, Sketch, Selection) opens the Preferences dialog there; `button`: `ok`, `cancel`, `apply`, `defaults`; `stand_up: true` stands up a just-opened Y-up file | sets preferences (kept between runs), returns them all plus `dialog` (the open page or null), `dark` and `stand_up_offer` |
| `ui.capture` | `action?`: `capture`, `revert`, `cancel` | answers the Capture Position question (asked when a command starts or the design is saved while components were moved without capturing); without `action`, what waits |
| `ui.window` | `action`: minimize, maximize, restore, toggle, close | what the title bar's caption buttons do (on Windows and Linux the application bar is the title bar); close asks about unsaved designs first |
| `ui.agent_cursor` | `show` (bool), `speed`: a number from 1 to 5 (times the normal speed) or `"instant"` (no animation: the command runs at once and the pointer jumps to where it acted), `follow_camera` (bool); all optional | the settings. While the cursor is shown, `engine.execute` first glides to the command's toolbar button and to each pick, then runs and replies; later requests wait their turn. `"animate": false` on a call skips it |
| `ui.resize` | `width`, `height` | |
| `app.quit` | `force?` (quit without asking about unsaved designs) | `quitting` (the window closes), `asking` (a "save changes?" prompt is open) |
## MCP
`solvecraft-cli mcp --connect 127.0.0.1:PORT` bridges an MCP client (an AI agent) to this
channel; see [mcp.md](mcp.md).
## Example
```text
{"id":1,"method":"engine.execute","params":{"command":"sketch.create","params":{"plane":"XY"}}}
{"id":2,"method":"engine.execute","params":{"command":"sketch.rectangle.two_point","params":{"p0":[0,0],"p1":[40,30]}}}
{"id":3,"method":"engine.execute","params":{"command":"solid.extrude","params":{"distance":20}}}
{"id":4,"method":"engine.execute","params":{"command":"solid.fillet","params":{"edges":[[0,0,10]],"radius":3}}}
{"id":5,"method":"ui.screenshot","params":{"path":"/tmp/part.png"}}
```
Hold Shift during an orbit gesture to snap to the nearest standard or diagonal view. This applies to
right-drag, the Orbit navigation tool, and dragging the axis view. Under the default preset,
Shift+middle also orbits with snapping; middle alone pans. Axis-view tips use world coordinates,
regardless of the up-axis preference. Clicking an aligned tip again flips to its opposite.
Shift-orbit snapping includes 45-degree edge views and isometric corner views, with a
lightly damped spring transition and a small boundary margin to prevent flicker.