92 lines
2.4 KiB
Rust
92 lines
2.4 KiB
Rust
use crate::{Axis, LayoutLen, Painter, Size};
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use std::any::Any;
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mod data;
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mod handle;
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mod like;
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mod request;
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mod size_rule;
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mod tag;
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mod view;
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mod widgets;
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pub use data::*;
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pub use handle::*;
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pub use like::*;
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pub use request::*;
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pub use size_rule::*;
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pub use tag::*;
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pub use view::*;
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pub use widgets::*;
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pub trait Widget: Any {
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/// Draws the widget, and returns what it used of the box it was given.
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fn draw(&mut self, painter: &mut Painter) -> Size;
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/// Describes an axis before painting. Return `None` when discovering it
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/// needs a concrete box or work performed by `draw`.
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fn size_request(&self, requests: &mut SizeRequests, axis: Axis) -> Option<RequestedLen> {
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self.size_hint(axis).map(|len| requests.length(len))
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}
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/// An exact length the widget can give without a painter or its children.
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/// Optional, and saves a draw rather than changing one: a hint that
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/// disagrees with the eventual draw fails a debug assertion.
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fn size_hint(&self, _axis: Axis) -> Option<LayoutLen> {
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None
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}
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}
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impl Widget for () {
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/// A gap: nothing drawn, at the default length, so a span gives it a share.
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fn draw(&mut self, _: &mut Painter) -> Size {
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Size::default()
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}
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fn size_hint(&self, _axis: Axis) -> Option<LayoutLen> {
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Some(LayoutLen::default())
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}
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}
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impl dyn Widget {
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pub fn as_any(&self) -> &dyn Any {
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self
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}
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pub fn as_any_mut(&mut self) -> &mut dyn Any {
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self
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}
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}
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/// A function that returns a widget given a UI.
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/// Useful for defining trait functions on widgets that create a parent widget so that the children
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/// don't need to be IDs yet
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pub trait WidgetFn<State, W: Widget + ?Sized>: FnOnce(&mut State) -> W {}
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impl<State, W: Widget + ?Sized, F: FnOnce(&mut State) -> W> WidgetFn<State, W> for F {}
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pub struct WidgetArr<const LEN: usize> {
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pub arr: [StrongWidget; LEN],
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}
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impl<const LEN: usize> WidgetArr<LEN> {
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pub fn new(arr: [StrongWidget; LEN]) -> Self {
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Self { arr }
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}
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}
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pub trait WidgetOption<State> {
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fn get(self, state: &mut State) -> Option<StrongWidget>;
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}
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impl<State> WidgetOption<State> for () {
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fn get(self, _: &mut State) -> Option<StrongWidget> {
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None
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}
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}
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impl<State, F: FnOnce(&mut State) -> Option<StrongWidget>> WidgetOption<State> for F {
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fn get(self, state: &mut State) -> Option<StrongWidget> {
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self(state)
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}
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}
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