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-rw-r--r--native/src/widget/space.rs104
1 files changed, 104 insertions, 0 deletions
diff --git a/native/src/widget/space.rs b/native/src/widget/space.rs
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+//! Distribute content vertically.
+use std::hash::Hash;
+
+use crate::{
+ layout, Element, Hasher, Layout, Length, Point, Rectangle, Size, Widget,
+};
+
+/// An amount of empty space.
+///
+/// It can be useful if you want to fill some space with nothing.
+#[derive(Debug)]
+pub struct Space {
+ width: Length,
+ height: Length,
+}
+
+impl Space {
+ /// Creates an amount of empty [`Space`] with the given width and height.
+ ///
+ /// [`Space`]: struct.Space.html
+ pub fn new(width: Length, height: Length) -> Self {
+ Space { width, height }
+ }
+
+ /// Creates an amount of horizontal [`Space`].
+ ///
+ /// [`Space`]: struct.Space.html
+ pub fn with_width(width: Length) -> Self {
+ Space {
+ width,
+ height: Length::Shrink,
+ }
+ }
+
+ /// Creates an amount of vertical [`Space`].
+ ///
+ /// [`Space`]: struct.Space.html
+ pub fn with_height(height: Length) -> Self {
+ Space {
+ width: Length::Shrink,
+ height,
+ }
+ }
+}
+
+impl<'a, Message, Renderer> Widget<Message, Renderer> for Space
+where
+ Renderer: self::Renderer,
+{
+ fn width(&self) -> Length {
+ self.width
+ }
+
+ fn height(&self) -> Length {
+ self.height
+ }
+
+ fn layout(
+ &self,
+ _renderer: &Renderer,
+ limits: &layout::Limits,
+ ) -> layout::Node {
+ let limits = limits.width(self.width).height(self.height);
+
+ layout::Node::new(limits.resolve(Size::ZERO))
+ }
+
+ fn draw(
+ &self,
+ renderer: &mut Renderer,
+ layout: Layout<'_>,
+ _cursor_position: Point,
+ ) -> Renderer::Output {
+ renderer.draw(layout.bounds())
+ }
+
+ fn hash_layout(&self, state: &mut Hasher) {
+ std::any::TypeId::of::<Space>().hash(state);
+ self.width.hash(state);
+ self.height.hash(state);
+ }
+}
+
+/// The renderer of an amount of [`Space`].
+///
+/// [`Space`]: struct.Space.html
+pub trait Renderer: crate::Renderer {
+ /// Draws an amount of empty [`Space`].
+ ///
+ /// You should most likely return an empty primitive here.
+ ///
+ /// [`Space`]: struct.Space.html
+ fn draw(&mut self, bounds: Rectangle) -> Self::Output;
+}
+
+impl<'a, Message, Renderer> From<Space> for Element<'a, Message, Renderer>
+where
+ Renderer: self::Renderer,
+ Message: 'static,
+{
+ fn from(space: Space) -> Element<'a, Message, Renderer> {
+ Element::new(space)
+ }
+}