zed/crates/gpui/examples/text.rs
2022-10-16 13:08:25 -06:00

126 lines
3.0 KiB
Rust

use gpui::{
color::Color,
fonts::{Properties, Weight},
text_layout::RunStyle,
DebugContext, Element as _, MeasurementContext, Quad,
};
use log::LevelFilter;
use pathfinder_geometry::rect::RectF;
use simplelog::SimpleLogger;
use std::ops::Range;
fn main() {
SimpleLogger::init(LevelFilter::Info, Default::default()).expect("could not initialize logger");
gpui::App::new(()).unwrap().run(|cx| {
cx.platform().activate(true);
cx.add_window(Default::default(), |_| TextView);
});
}
struct TextView;
struct TextElement;
impl gpui::Entity for TextView {
type Event = ();
}
impl gpui::View for TextView {
fn ui_name() -> &'static str {
"View"
}
fn render(&mut self, _: &mut gpui::RenderContext<Self>) -> gpui::ElementBox {
TextElement.boxed()
}
}
impl gpui::Element for TextElement {
type LayoutState = ();
type PaintState = ();
fn layout(
&mut self,
constraint: gpui::SizeConstraint,
_: &mut gpui::LayoutContext,
) -> (pathfinder_geometry::vector::Vector2F, Self::LayoutState) {
(constraint.max, ())
}
fn paint(
&mut self,
bounds: RectF,
visible_bounds: RectF,
_: &mut Self::LayoutState,
cx: &mut gpui::PaintContext,
) -> Self::PaintState {
let font_size = 12.;
let family = cx.font_cache.load_family(&["SF Pro Display"]).unwrap();
let normal = RunStyle {
font_id: cx
.font_cache
.select_font(family, &Default::default())
.unwrap(),
color: Color::default(),
underline: Default::default(),
};
let bold = RunStyle {
font_id: cx
.font_cache
.select_font(
family,
&Properties {
weight: Weight::BOLD,
..Default::default()
},
)
.unwrap(),
color: Color::default(),
underline: Default::default(),
};
let text = "Hello world!";
let line = cx.text_layout_cache.layout_str(
text,
font_size,
&[
(1, normal),
(1, bold),
(1, normal),
(1, bold),
(text.len() - 4, normal),
],
);
cx.scene.push_quad(Quad {
bounds,
background: Some(Color::white()),
..Default::default()
});
line.paint(bounds.origin(), visible_bounds, bounds.height(), cx);
}
fn rect_for_text_range(
&self,
_: Range<usize>,
_: RectF,
_: RectF,
_: &Self::LayoutState,
_: &Self::PaintState,
_: &MeasurementContext,
) -> Option<RectF> {
None
}
fn debug(
&self,
_: RectF,
_: &Self::LayoutState,
_: &Self::PaintState,
_: &DebugContext,
) -> gpui::json::Value {
todo!()
}
}