Struct CollapsingState

pub struct CollapsingState { /* private fields */ }

This is a a building block for building collapsing regions.

It is used by CollapsingHeader and Window, but can also be used on its own.

See CollapsingState::show_header for how to show a collapsing header with a custom header.

Implementations

impl CollapsingState

pub fn load(ctx: &Context, id: Id) -> Option<CollapsingState>

pub fn store(&self, ctx: &Context)

pub fn id(&self) -> Id

pub fn load_with_default_open( ctx: &Context, id: Id, default_open: bool, ) -> CollapsingState

pub fn is_open(&self) -> bool

pub fn set_open(&mut self, open: bool)

pub fn toggle(&mut self, ui: &Ui)

pub fn openness(&self, ctx: &Context) -> f32

0 for closed, 1 for open, with tweening

pub fn show_header<HeaderRet>( self, ui: &mut Ui, add_header: impl FnOnce(&mut Ui) -> HeaderRet, ) -> HeaderResponse<'_, HeaderRet>

Shows header and body (if expanded).

The header will start with the default button in a horizontal layout, followed by whatever you add.

Will also store the state.

Returns the response of the collapsing button, the custom header, and the custom body.

let id = ui.make_persistent_id("my_collapsing_header");
egui::collapsing_header::CollapsingState::load_with_default_open(ui.ctx(), id, false)
    .show_header(ui, |ui| {
        ui.label("Header"); // you can put checkboxes or whatever here
    })
    .body(|ui| ui.label("Body"));

pub fn show_body_indented<R>( &mut self, header_response: &Response, ui: &mut Ui, add_body: impl FnOnce(&mut Ui) -> R, ) -> Option<InnerResponse<R>>

Show body if we are open, with a nice animation between closed and open. Indent the body to show it belongs to the header.

Will also store the state.

pub fn show_body_unindented<R>( &mut self, ui: &mut Ui, add_body: impl FnOnce(&mut Ui) -> R, ) -> Option<InnerResponse<R>>

Show body if we are open, with a nice animation between closed and open. Will also store the state.

pub fn show_toggle_button( &mut self, ui: &mut Ui, icon_fn: impl FnOnce(&mut Ui, f32, &Response) + 'static, ) -> Response

Paint this CollapsingState’s toggle button. Takes an IconPainter as the icon.

fn circle_icon(ui: &mut egui::Ui, openness: f32, response: &egui::Response) {
    let stroke = ui.style().interact(&response).fg_stroke;
    let radius = egui::lerp(2.0..=3.0, openness);
    ui.painter().circle_filled(response.rect.center(), radius, stroke.color);
}

let mut state = egui::collapsing_header::CollapsingState::load_with_default_open(
    ui.ctx(),
    ui.make_persistent_id("my_collapsing_state"),
    false,
);

let header_res = ui.horizontal(|ui| {
    ui.label("Header");
    state.show_toggle_button(ui, circle_icon);
});

state.show_body_indented(&header_res.response, ui, |ui| ui.label("Body"));

Trait Implementations

impl Clone for CollapsingState

fn clone(&self) -> CollapsingState

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for CollapsingState

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

Formats the value using the given formatter.