Struct Cursor 

pub struct Cursor { /* private fields */ }

Where an open menu is being worked: open is the chain of submenu rows currently down, outermost first, and row is the live row in the menu that chain ends at.

One cursor for both input devices. A menu that tracked hover separately from the keyboard could have two rows lit and a submenu hanging off neither.

Implementations

impl Cursor

pub fn open(&self) -> &[usize]

The submenu rows currently down, outermost first.

pub fn row(&self) -> Option<usize>

The live row in the innermost open menu.

pub fn nested(&self) -> bool

Whether a submenu is down — where a menubar’s left closes a level instead of crossing to the previous menu.

pub fn path(&self) -> Option<Vec<usize>>

The full path to the live row, outermost first.

pub fn clear(&mut self)

Nothing down, nothing live — a menu opens here, and closes back to it.

pub fn lit(&self, depth: usize) -> Option<usize>

The row lit in the panel at depth: the row holding the submenu open above the innermost panel, the live row in it, nothing below.

pub fn step(&mut self, root: &[Item], delta: isize)

Move within the innermost open panel.

pub fn descend(&mut self, root: &[Item]) -> bool

Open the submenu under the live row and land on its first row. false when the live row is not one — which is a menubar’s cue that right meant the next menu instead.

pub fn ascend(&mut self) -> bool

Close the innermost submenu, landing back on the row that opened it. false at the top level, where closing is the whole menu’s to do.

pub fn point_at(&mut self, root: &[Item], path: &[usize]) -> bool

Put the cursor on the row path names, opening the chain above it and, if it is a submenu row, itself — pointing at a submenu row is what opens it. Nothing is lit inside the fresh panel until something moves into it.

Answers whether that changed anything, because the pointer reports every move and only a change is worth a repaint.

Trait Implementations

impl Clone for Cursor

fn clone(&self) -> Cursor

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Cursor

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Cursor

fn default() -> Cursor

Returns the “default value” for a type.

impl Eq for Cursor

impl PartialEq for Cursor

fn eq(&self, other: &Cursor) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Cursor