154 lines
3 KiB
Rust
154 lines
3 KiB
Rust
use crate::alignment;
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use crate::renderer::{self, Renderer};
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use crate::text::{self, Text};
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use crate::{Background, Color, Font, Pixels, Point, Rectangle, Size, Vector};
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use std::borrow::Cow;
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/// A renderer that does nothing.
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///
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/// It can be useful if you are writing tests!
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#[derive(Debug, Clone, Copy, Default)]
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pub struct Null;
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impl Null {
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/// Creates a new [`Null`] renderer.
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pub fn new() -> Null {
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Null
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}
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}
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impl Renderer for Null {
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type Theme = ();
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fn with_layer(&mut self, _bounds: Rectangle, _f: impl FnOnce(&mut Self)) {}
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fn with_translation(
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&mut self,
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_translation: Vector,
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_f: impl FnOnce(&mut Self),
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) {
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}
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fn clear(&mut self) {}
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fn fill_quad(
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&mut self,
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_quad: renderer::Quad,
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_background: impl Into<Background>,
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) {
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}
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}
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impl text::Renderer for Null {
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type Font = Font;
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type Paragraph = ();
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type Editor = ();
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const ICON_FONT: Font = Font::DEFAULT;
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const CHECKMARK_ICON: char = '0';
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const ARROW_DOWN_ICON: char = '0';
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fn default_font(&self) -> Self::Font {
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Font::default()
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}
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fn default_size(&self) -> Pixels {
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Pixels(16.0)
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}
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fn load_font(&mut self, _font: Cow<'static, [u8]>) {}
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fn fill_paragraph(
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&mut self,
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_paragraph: &Self::Paragraph,
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_position: Point,
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_color: Color,
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) {
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}
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fn fill_editor(
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&mut self,
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_editor: &Self::Editor,
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_position: Point,
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_color: Color,
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) {
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}
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fn fill_text(
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&mut self,
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_paragraph: Text<'_, Self::Font>,
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_position: Point,
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_color: Color,
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) {
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}
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}
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impl text::Paragraph for () {
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type Font = Font;
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fn with_text(_text: Text<'_, Self::Font>) -> Self {}
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fn resize(&mut self, _new_bounds: Size) {}
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fn compare(&self, _text: Text<'_, Self::Font>) -> text::Difference {
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text::Difference::None
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}
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fn horizontal_alignment(&self) -> alignment::Horizontal {
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alignment::Horizontal::Left
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}
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fn vertical_alignment(&self) -> alignment::Vertical {
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alignment::Vertical::Top
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}
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fn grapheme_position(&self, _line: usize, _index: usize) -> Option<Point> {
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None
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}
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fn min_bounds(&self) -> Size {
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Size::ZERO
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}
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fn hit_test(&self, _point: Point) -> Option<text::Hit> {
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None
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}
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}
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impl text::Editor for () {
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type Font = Font;
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fn with_text(_text: &str) -> Self {}
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fn cursor(&self) -> text::editor::Cursor {
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text::editor::Cursor::Caret(Point::ORIGIN)
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}
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fn selection(&self) -> Option<String> {
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None
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}
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fn line(&self, _index: usize) -> Option<&str> {
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None
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}
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fn line_count(&self) -> usize {
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0
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}
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fn perform(&mut self, _action: text::editor::Action) {}
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fn bounds(&self) -> Size {
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Size::ZERO
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}
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fn update(
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&mut self,
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_new_bounds: Size,
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_new_font: Self::Font,
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_new_size: Pixels,
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_new_line_height: text::LineHeight,
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) {
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}
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}
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