Keyboard and mouse
- Esc drops what is pending (picks, a dimension's first point, an edit-op or transform) and
never applies it; Enter applies a ready edit-op/transform, ends a polyline/spline chain,
ends an armed tool, and confirms a feature card exactly when its ✓ is enabled.
- Right-click only abandons the gesture in progress; with nothing pending it opens the offer
in every tool (Trim, edit-ops, transforms, Dimension, Constrain, TransformArt, move gizmo).
Clicking empty space no longer commits. The offer needs no timing, only a still press.
- Delete removes only an explicit selection. Undo/redo inside a sketch go through the same
route as the buttons (whole shapes, with redo); Edit > Undo follows the shown tab.
- The canvas no longer handles Delete/Esc/Ctrl+Z itself (Backspace in a value field deleted
the geometry it measured); F is in the panel's key map.
- Value fields: a refused value keeps the field open with the reason; click outside and Tab
commit; an untouched field commits the exact value; any decimal separator is accepted;
lengths are always mm; validation is the same for every editor.
- Snapping: the marker shows only where the click will actually snap; pick tolerances are
one set of pixel budgets (Constrain picks within reach; no mm floor on labels).
Messages and consistency
- set_status(kind, text) gives every status line its own colour and glyph; kernel errors are
translated into sentences and formatted, not concatenated; sketch refusals go to the status
line instead of the per-frame HUD that erased them.
- Hints describe the gestures that now work; Dimension shows its second step; Constrain uses
the sketch palette (red means conflict only); the straight slot's value is its width.
- Hole/Thread/Project keep the user's pick or refuse up front; circular pattern opens with its
own preview; thread fields use the nominal diameter and the ISO internal depth.
Integration
- MCP loads the project's recipe before touching the document, refuses to mutate it while the
tab is busy, never runs a request that already timed out, only replaces a socket at its
path, caps line length and removes the socket at exit; not started in the G-code viewer.
- Hiding a feature keeps later body references on their bodies; a design keeps its modeling
origin across printer changes.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QK4VgguuCAk2hZLWgcjJb9
Two presses used to discard a live sketch. The key was answered in four places that could not
see each other — the inline value field, a sketch branch, a feature-card branch, and the canvas
— so a press aimed at one fell through to the next, and request_exit() carried a fourth layer
that deliberately let the SECOND consecutive press through to cancel_sketch(). The warning it
showed first did not help: the two presses are never one decision, the first is aimed at a field
or a tool and the second at whatever was underneath it.
The stack is now explicit. CadLevel (DesignInteraction.hpp) is four levels deep, the enum value
IS the LIFO depth, and cad_escape_level() is a constexpr function over a POD of four booleans —
so the ordering that is the entire contract is checked by static_assert at compile time, with no
window, GL context or event loop. DesignPanel::escape() acts on the one level escape_level()
names and on no other, and every Esc in the tab routes through it.
The destructive layer is gone from request_exit() itself rather than guarded at its callers, so
the guarantee cannot be re-opened by adding a route: a session holding geometry is left only
through Finish (keep) or Cancel (discard). Cancel now asks before discarding — it used to refuse
and tell the user to press the button they had just pressed, which meant a drawn sketch could be
kept but never thrown away.
Right-click also stops rewarding navigation with a menu: the offer needs BOTH budgets, released
within 200 ms and moved no more than 3 px, and the raycast uses the press position, so the menu
describes what was pointed at rather than where the camera stopped. Two budgets because drift
alone still popped a menu at the end of a slow, careful orbit.
docs/ux/interaction-model.md carries the state machine, the routing and the transition table.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011FbJKJAJxxkhDTs9XdZzKA
Claude