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 and for moving, rotating, shearing and stretching tracks; 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.
Drag a track, or its fixes in the time window	Tab to the selected track's move handle; the arrow keys move it 5 pixels (25 with Shift), and the run of presses is one step, as for an annotation's handle. Whole track and Time window are buttons on the map. Or Move track… and type the distance and bearing (track operations, item 11).
Rotate a track	Tab to its rotate handle; Right and Up turn it 1° clockwise, Left and Down anticlockwise, 10° with Shift; one step for the run. The pivot handle moves with the arrow keys. Or Rotate track…, with the pivot and angle typed.
Shear or stretch a track	Tab to a diamond beside the first or last fix. Shearing, the arrow keys move it 5 pixels (25 with Shift), the other end held; stretching (Stretch on the map), Up and Right make it 0.1 kn faster, Down and Left slower, 1 kn with Shift. One step for the run. Or Shear track… (course and speed made good) and Stretch track… (speed) (track operations).
Split or merge tracks	Split track at current time… and Merge selected tracks on the outline's context menu (Split… and Merge under Track, below the outline, in the playground); there is no map gesture for either.
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; vscode/webview/trackmap.ts and vscode/webview/trackedit.ts for a track's handles. The playground tests vscode/test/play/drawing.mjs and vscode/test/play/tracks.mjs place a marker, change an area, move and rotate a track, and vscode/test/play/shear.mjs shears and stretches one, from the keyboard alone.