Struct PopupGeometry 

pub struct PopupGeometry {
    pub rect: Rect,
    pub placement: Placement,
    pub row_height: f32,
}

Where an open dropdown sits and how tall its rows are.

Pure geometry, in page space (PDF user space, y-up) — the same space the widget’s /Rect is written in and the same space an crate::Event arrives in, so a host can hit-test a click against Self::rect without a transform.

Fields

rect: Rect

The whole list window, border included, in page space.

A kurbo::Rect on the way out: this is geometry a host paints and hit-tests against, in the same vocabulary Page::crop_box speaks. The values inside are the crate’s f32 widened losslessly — the placement arithmetic below is f32 throughout, and stays that way.

placement: Placement

Which side of the widget it opened on.

row_height: f32

The height of one row, which is the laid-out line height and not the font size — see crate::route’s row_height.

Implementations

impl PopupGeometry

pub fn plate(&self) -> Rect

The area the rows are drawn in: the window deflated by its border.

This is what row rectangles are measured against, and a visible scroll bar’s width is not subtracted from it — the rows keep their full width behind one.

pub fn row_rect(&self, offset: usize) -> Rect

The rectangle of one visible row, counting offset rows down from the first one showing.

Rows stack downward from the plate’s top by exactly one row height each. A row past the bottom of the plate still has a rectangle — the caller clips.

pub fn visible_rows(&self) -> usize

How many rows fit in the plate, whole and partial alike.

A partial row at the bottom is still drawn — any item overlapping the plate is kept — so a viewer counting rows to paint wants the rounded-up count, not the floor.

Trait Implementations

impl Clone for PopupGeometry

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for PopupGeometry

impl Debug for PopupGeometry

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

Formats the value using the given formatter.

impl PartialEq for PopupGeometry

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for PopupGeometry