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gpui: Introduce dash array support for PathBuilder (#31678)

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A simple way to draw dashed lines.


https://github.com/user-attachments/assets/2105d7b2-42d0-4d73-bb29-83a4a6bd7029

Release Notes:

- N/A
This commit is contained in:
Floyd Wang 2025-06-07 00:54:21 +08:00 • committed by GitHub
parent 73cd6ef92c
commit ac806d982b
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GPG key ID: B5690EEEBB952194
2 changed files with 84 additions and 15 deletions
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49
crates/gpui/examples/painting.rs
View file

@ -1,13 +1,14 @@
use gpui::{
Application, Background, Bounds, ColorSpace, Context, MouseDownEvent, Path, PathBuilder,
PathStyle, Pixels, Point, Render, StrokeOptions, Window, WindowOptions, canvas, div,
linear_color_stop, linear_gradient, point, prelude::*, px, rgb, size,
PathStyle, Pixels, Point, Render, SharedString, StrokeOptions, Window, WindowOptions, canvas,
div, linear_color_stop, linear_gradient, point, prelude::*, px, rgb, size,
};
struct PaintingViewer {
default_lines: Vec<(Path<Pixels>, Background)>,
lines: Vec<Vec<Point<Pixels>>>,
start: Point<Pixels>,
dashed: bool,
_painting: bool,
}
@ -140,7 +141,7 @@ impl PaintingViewer {
.with_line_join(lyon::path::LineJoin::Bevel);
let mut builder = PathBuilder::stroke(px(1.)).with_style(PathStyle::Stroke(options));
builder.move_to(point(px(40.), px(320.)));
for i in 0..50 {
for i in 1..50 {
builder.line_to(point(
px(40.0 + i as f32 * 10.0),
px(320.0 + (i as f32 * 10.0).sin() * 40.0),
@ -153,6 +154,7 @@ impl PaintingViewer {
default_lines: lines.clone(),
lines: vec![],
start: point(px(0.), px(0.)),
dashed: false,
_painting: false,
}
}
@ -162,10 +164,30 @@ impl PaintingViewer {
cx.notify();
}
}
fn button(
text: &str,
cx: &mut Context<PaintingViewer>,
on_click: impl Fn(&mut PaintingViewer, &mut Context<PaintingViewer>) + 'static,
) -> impl IntoElement {
div()
.id(SharedString::from(text.to_string()))
.child(text.to_string())
.bg(gpui::black())
.text_color(gpui::white())
.active(|this| this.opacity(0.8))
.flex()
.px_3()
.py_1()
.on_click(cx.listener(move |this, _, _, cx| on_click(this, cx)))
}
impl Render for PaintingViewer {
fn render(&mut self, _: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
let default_lines = self.default_lines.clone();
let lines = self.lines.clone();
let dashed = self.dashed;
div()
.font_family(".SystemUIFont")
.bg(gpui::white())
@ -182,17 +204,14 @@ impl Render for PaintingViewer {
.child("Mouse down any point and drag to draw lines (Hold on shift key to draw straight lines)")
.child(
div()
.id("clear")
.child("Clean up")
.bg(gpui::black())
.text_color(gpui::white())
.active(|this| this.opacity(0.8))
.flex()
.px_3()
.py_1()
.on_click(cx.listener(|this, _, _, cx| {
this.clear(cx);
})),
.gap_x_2()
.child(button(
if dashed { "Solid" } else { "Dashed" },
cx,
move |this, _| this.dashed = !dashed,
))
.child(button("Clear", cx, |this, cx| this.clear(cx))),
),
)
.child(
@ -202,7 +221,6 @@ impl Render for PaintingViewer {
canvas(
move |_, _, _| {},
move |_, _, window, _| {
for (path, color) in default_lines {
window.paint_path(path, color);
}
@ -213,6 +231,9 @@ impl Render for PaintingViewer {
}
let mut builder = PathBuilder::stroke(px(1.));
if dashed {
builder = builder.dash_array(&[px(4.), px(2.)]);
}
for (i, p) in points.into_iter().enumerate() {
if i == 0 {
builder.move_to(p);