103 lines
2.3 KiB
Rust
103 lines
2.3 KiB
Rust
//! Distribute content vertically.
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use std::hash::Hash;
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use crate::{
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layout, Element, Hasher, Layout, Length, Point, Rectangle, Size, Widget,
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};
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/// An amount of empty space.
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///
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/// It can be useful if you want to fill some space with nothing.
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///
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/// [`Empty`]: struct.Empty.html
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#[derive(Debug)]
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pub struct Empty {
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width: Length,
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height: Length,
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}
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impl Empty {
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/// Creates an amount of [`Empty`] space.
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///
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/// [`Empty`]: struct.Empty.html
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pub fn new() -> Self {
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Empty {
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width: Length::Shrink,
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height: Length::Shrink,
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}
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}
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/// Sets the width of the [`Empty`] space.
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///
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/// [`Empty`]: struct..html
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pub fn width(mut self, width: Length) -> Self {
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self.width = width;
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self
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}
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/// Sets the height of the [`Empty`] space.
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///
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/// [`Empty`]: struct.Column.html
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pub fn height(mut self, height: Length) -> Self {
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self.height = height;
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self
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}
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}
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impl<'a, Message, Renderer> Widget<Message, Renderer> for Empty
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where
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Renderer: self::Renderer,
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{
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fn width(&self) -> Length {
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self.width
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}
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fn height(&self) -> Length {
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self.height
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}
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fn layout(
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&self,
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_renderer: &Renderer,
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limits: &layout::Limits,
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) -> layout::Node {
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let limits = limits.width(self.width).height(self.height);
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layout::Node::new(limits.resolve(Size::ZERO))
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}
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fn draw(
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&self,
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renderer: &mut Renderer,
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layout: Layout<'_>,
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_cursor_position: Point,
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) -> Renderer::Output {
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renderer.draw(layout.bounds())
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}
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fn hash_layout(&self, state: &mut Hasher) {
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std::any::TypeId::of::<Empty>().hash(state);
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self.width.hash(state);
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self.height.hash(state);
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}
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}
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/// The renderer of an amount of [`Empty`] space.
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///
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/// [`Empty`]: struct.Empty.html
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pub trait Renderer: crate::Renderer {
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/// Draws an amount of [`Empty`] space.
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///
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/// You should most likely return an empty primitive here.
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fn draw(&mut self, bounds: Rectangle) -> Self::Output;
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}
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impl<'a, Message, Renderer> From<Empty> for Element<'a, Message, Renderer>
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where
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Renderer: self::Renderer,
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Message: 'static,
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{
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fn from(empty: Empty) -> Element<'a, Message, Renderer> {
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Element::new(empty)
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}
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}
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