ComboBox renders a field showing the selection and a drop-down menu built
entirely with gpui's anchored + deferred elements (no platform primitives).
Menu dismissal is mouse-up-out based so an option click is never swallowed
by a capture-phase close that would redraw the menu away; the field toggles
from the open state recorded at mouse-down. Arrow keys cycle the selection
with wrap-around, escape closes. 48 tests pass.
Completes the basic form controls of W1: a SpinBox reusing SliderModel for
range/step/clamping with an editable_text field (enter/blur commits,
escape reverts, invalid input rejected) and up/down buttons; a CheckBox with
optional tri-state and request-only Toggled events; a RadioGroup that emits
Selected requests. All three follow the request-only contract: the host
applies changes and updates the widget's display state. 45 tests pass.
Implements W1's slider: a pure SliderModel state machine (float, integer,
rational and angle kinds with clamping, step snapping, fine adjustment and
drag math) plus the Slider view with vertical-drag scrubbing (shift for
fine), double-click direct entry backed by editable_text (enter commits,
escape cancels, click-away commits, invalid text rejected), wheel stepping,
middle-click reset and arrow-key navigation. Every edit is emitted as a
SliderEvent request; keyable controls expose a Keying diamond. 37 unit and
interaction tests pass.
New workspace crate implementing W1 of the oak task list. This first
slice lands the pure numeric core (ValueKind / SliderValue /
RationalValue / ValueFormatter with round-trip tests) and the keying
diamond button (KeyingState / KeyingRequest) that keyable controls
embed. 12 unit tests pass.
Mike-Solar