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use crate::renderer::{self, Renderer};
use crate::text::{self, Text};
use crate::{Background, Font, Point, Rectangle, Size, Vector};
/// A renderer that does nothing.
///
/// It can be useful if you are writing tests!
#[derive(Debug, Clone, Copy)]
pub struct Null;
impl Null {
/// Creates a new [`Null`] renderer.
pub fn new() -> Null {
Null
}
}
impl Renderer for Null {
fn with_layer(&mut self, _bounds: Rectangle, _f: impl FnOnce(&mut Self)) {}
fn with_translation(
&mut self,
_translation: Vector,
_f: impl FnOnce(&mut Self),
) {
}
fn clear(&mut self) {}
fn fill_quad(
&mut self,
_quad: renderer::Quad,
_background: impl Into<Background>,
) {
}
}
impl text::Renderer for Null {
type Font = Font;
const ICON_FONT: Font = Font::Default;
const CHECKMARK_ICON: char = '0';
const ARROW_DOWN_ICON: char = '0';
fn default_size(&self) -> u16 {
20
}
fn measure(
&self,
_content: &str,
_size: u16,
_font: Font,
_bounds: Size,
) -> (f32, f32) {
(0.0, 20.0)
}
fn hit_test(
&self,
_contents: &str,
_size: f32,
_font: Self::Font,
_bounds: Size,
_point: Point,
_nearest_only: bool,
) -> Option<text::Hit> {
None
}
fn fill_text(&mut self, _text: Text<'_, Self::Font>) {}
}
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