Struct Takeover 

pub struct Takeover(/* private fields */);

A flag that follows something else until the user takes it over.

The rule behind a section that opens itself while work streams in and collapses when it stops: auto-follow is right until the first press, and wrong immediately after — whatever the flag does next, the person who clicked has to win. Nothing agent-shaped about it; a build log that unfolds while it runs and a detail pane that follows the selection both want this.

It is an Option<bool> rather than the two flags it reads as (touched, plus the value): “untouched, and here is the manual value” is a state that cannot mean anything, and this way it cannot be written.

let open = self.details.get(self.running);           // paint this
// …on the header's click:
self.details.toggle(self.running);

Implementations

impl Takeover

pub fn get(self, auto: bool) -> bool

What to show: auto until the first Self::toggle, the user’s own choice from then on.

pub fn toggle(&mut self, auto: bool)

Flip what is currently on screen — which while nobody has touched it is auto, not the stored value — and take over from here.

Trait Implementations

impl Clone for Takeover

fn clone(&self) -> Takeover

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Takeover

impl Debug for Takeover

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

Formats the value using the given formatter.

impl Default for Takeover

fn default() -> Takeover

Returns the “default value” for a type.

impl Eq for Takeover

impl PartialEq for Takeover

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Takeover