VariablesPanel chips were previously click-swallowing placeholders.
This commit adds the actual axis-cycle behavior — clicking the
"mode: dark" chip flips it to "mode: light", then "mode: sepia",
wrapping back to "mode: light". The TS app has the equivalent
behavior via its theme dropdown; the Rust shell now offers the
one-click chip flip as the simpler entry point.
`crates/openpencil-shell-core/src/document/variables.rs`:
- `VariableTable::cycle_active_axis_value(axis) -> bool`:
1. Returns false (no-op) when `axis` isn't in `themes` or
its values list is empty.
2. When the axis isn't in `active_theme`, seeds it with the
first value.
3. When current value matches an entry, advances to the
next (wrapping past the last).
4. When current value is unrecognized (axis options
changed since file loaded), falls back to the first.
`crates/openpencil-shell-native/src/widget_host/property_dispatch.rs`:
- `dispatch_variables_panel_press` `AxisChip(idx)` branch now
looks up the axis name by position in `active_theme` (BTreeMap
iteration is stable + matches the chip walk order in
VariablesPanel::paint), commits any pending property focus,
captures an undo snapshot, calls `cycle_active_axis_value`,
and pushes the snapshot onto history when the cycle actually
moved (return true). Snapshot+restore covers var_table per
the prior history fix (99d602a3), so undo round-trips the
theme cycle the same way it does variable color edits.
Tests (5 added, 300 shell-core total):
- `cycle_active_axis_seeds_first_value_when_absent` — axis in
`themes` but not in `active_theme` → cycle plants the first
value.
- `cycle_active_axis_advances_to_next_value` — three-value
walk through light → dark → sepia → light (wrap).
- `cycle_active_axis_returns_false_for_unknown_axis` — no-op +
false.
- `cycle_active_axis_returns_false_for_empty_values` — defined
in themes but with empty values list → no-op + false.
- `cycle_active_axis_falls_back_to_first_when_current_unknown`
— graceful degradation when active_theme has a stale value
(axis options changed since file load).
The variable edit chain now covers BOTH primary surfaces:
- Row click on a Color-kind variable → ColorPicker → set_color_hex
- Axis chip click → cycle_active_axis_value
Both push undo entries that restore through the var_table-aware
snapshot.
a036463c93