Keyboard equivalents

How every map action can be done without a mouse.

The model, its sequence diagram and its reference implementation are written in Phase 3. Version 0 gathers the requirements it must satisfy.

Requirements cited

SRD	Requirement
NFR-13	The interface is operable by keyboard; every map action (dragging a track, drawing an annotation, measuring) has a keyboard or form-based equivalent; themes, including high contrast, are honoured.

Model

Written so far for annotations; the rest of the map follows in Phase 3.

Map action	Without a pointer
Draw a line, area, circle, ellipse, label or marker	Tab to the map's Draw an annotation toolbar, Enter on a kind; the arrow keys pan the map under the cross in its middle, Space places a point there, Enter finishes, Backspace removes the last, Escape cancels. Or Add annotation… and type the positions (annotations, items 1 to 6).
Drag a corner, centre, radius, axis or label	Tab to its handle; the arrow keys move it 5 pixels (25 with Shift); the run of presses is one step when they stop, on Enter, or when the keyboard moves on (presses made while it is saved follow as the next step); Escape puts it back. Or type the change on its properties form.
Add a corner between two	Arrow keys on the handle between them.
Remove a corner	Delete or Backspace on its handle.
Clear the selection	Escape on the map; or the outline, a native tree.
Pan, zoom	Arrow keys, and + and -, with the map focused.

Reference implementation

vscode/webview/mapedit.ts (keys while drawing and on handles) and vscode/webview/drawing.ts; the playground test vscode/test/play/drawing.mjs places a marker and changes an area from the keyboard alone.