iced_native/renderer/
null.rs

1use crate::renderer::{self, Renderer};
2use crate::text::{self, Text};
3use crate::{Background, Font, Point, Rectangle, Size, Theme, Vector};
4
5/// A renderer that does nothing.
6///
7/// It can be useful if you are writing tests!
8#[derive(Debug, Clone, Copy, Default)]
9pub struct Null;
10
11impl Null {
12    /// Creates a new [`Null`] renderer.
13    pub fn new() -> Null {
14        Null
15    }
16}
17
18impl Renderer for Null {
19    type Theme = Theme;
20
21    fn with_layer(&mut self, _bounds: Rectangle, _f: impl FnOnce(&mut Self)) {}
22
23    fn with_translation(
24        &mut self,
25        _translation: Vector,
26        _f: impl FnOnce(&mut Self),
27    ) {
28    }
29
30    fn clear(&mut self) {}
31
32    fn fill_quad(
33        &mut self,
34        _quad: renderer::Quad,
35        _background: impl Into<Background>,
36    ) {
37    }
38}
39
40impl text::Renderer for Null {
41    type Font = Font;
42
43    const ICON_FONT: Font = Font::Default;
44    const CHECKMARK_ICON: char = '0';
45    const ARROW_DOWN_ICON: char = '0';
46
47    fn default_size(&self) -> f32 {
48        20.0
49    }
50
51    fn measure(
52        &self,
53        _content: &str,
54        _size: f32,
55        _font: Font,
56        _bounds: Size,
57    ) -> (f32, f32) {
58        (0.0, 20.0)
59    }
60
61    fn hit_test(
62        &self,
63        _contents: &str,
64        _size: f32,
65        _font: Self::Font,
66        _bounds: Size,
67        _point: Point,
68        _nearest_only: bool,
69    ) -> Option<text::Hit> {
70        None
71    }
72
73    fn fill_text(&mut self, _text: Text<'_, Self::Font>) {}
74}
iced_native/renderer/null.rs

iced_native/renderer/
null.rs
