Input — vw

Pointer input is per widget; keys go to one handler per surface and then to the focused text field.

vw::Input

Field	Called with
`on_click`	`ClickEvent {x, y, button}` — 272 left, 273 right, 274 middle
`hover`	`Hover {color, scale, duration}`: a tint and scale animated without rebuilding
`on_hover`	`bool inside` — entering and leaving, even under other widgets; rebuilds afterwards
`on_drag_start`, `on_drag`, `on_drag_end`	`DragEvent {x, y, start_x, start_y, dx, dy, delta_x, delta_y, button, cancelled}`
`on_scroll`	`ScrollEvent {x, y, delta}` — positive scrolls down
`drag_button`	which button drags (BTN_LEFT, 272)

The topmost widget under the pointer receives clicks. A drag captures the pointer until release. Handlers usually change your state; the scene rebuilds after every handler runs.

Keyboard

ui.keyboard([&](const vw::KeyEvent& key) {
  if (key.name == "Escape") { open = false; return true; }
  if (key.name == "Down") { ++selected; return true; }
  return false;  // the focused text field gets it
}, vw::Keyboard::exclusive);

KeyEvent has keysym, name (xkb names: Escape, Return, Down, a, F5), text (UTF-8, if any), modifier flags ctrl, alt, shift, super, and repeat for key-repeat events. The mode applies to layer surfaces; see Shells and layer surfaces.