Enum Drawn 

pub enum Drawn {
    Map,
    Nothing,
    Cannot(Maps),
}

What a call to Screen::show left on the terminal.

An answer rather than Ok(()), because “there is no picture” and “the picture is already right” are the same silence otherwise — which is exactly how #656 went unreported for as long as it did. The caller can see which it got, and say so.

Variants

Map

A map is on the terminal: written by this call, or still right from an earlier one.

Nothing

None, because there is nothing under the cursor worth dividing into rectangles — an empty directory, or one whose whole subtree the lens hides. Not a fault in anything.

Cannot(Maps)

None, because this terminal cannot have one — and which of the two reasons it is.

The layout should never have reserved a pane, and this is how the caller finds out that it did. A run that reaches this has Maps and the pane it was handed disagreeing, which is #656’s shape returning; the caller’s job is to believe the screen, which has actually tried, over the layout, which has only asked.

The reason travels with it rather than being assumed at the other end, because the caller assuming would be the wrong sentence under the pane on the terminal where the other reason was the true one.

Trait Implementations

impl Clone for Drawn

fn clone(&self) -> Drawn

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Drawn

impl Debug for Drawn

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

Formats the value using the given formatter.

impl Eq for Drawn

impl PartialEq for Drawn

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Drawn