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Diffstat (limited to 'native/src/widget/space.rs')
-rw-r--r-- | native/src/widget/space.rs | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/native/src/widget/space.rs b/native/src/widget/space.rs new file mode 100644 index 00000000..2029c52f --- /dev/null +++ b/native/src/widget/space.rs @@ -0,0 +1,104 @@ +//! 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) + } +} |