79 lines
1.6 KiB
Rust
79 lines
1.6 KiB
Rust
use super::Element;
|
|
use crate::{
|
|
json::{self, json},
|
|
DebugContext, PaintContext,
|
|
};
|
|
use json::ToJson;
|
|
use pathfinder_geometry::{
|
|
rect::RectF,
|
|
vector::{vec2f, Vector2F},
|
|
};
|
|
|
|
pub struct Canvas<F>(F);
|
|
|
|
impl<F> Canvas<F>
|
|
where
|
|
F: FnMut(RectF, RectF, &mut PaintContext),
|
|
{
|
|
pub fn new(f: F) -> Self {
|
|
Self(f)
|
|
}
|
|
}
|
|
|
|
impl<F> Element for Canvas<F>
|
|
where
|
|
F: FnMut(RectF, RectF, &mut PaintContext),
|
|
{
|
|
type LayoutState = ();
|
|
type PaintState = ();
|
|
|
|
fn layout(
|
|
&mut self,
|
|
constraint: crate::SizeConstraint,
|
|
_: &mut crate::LayoutContext,
|
|
) -> (Vector2F, Self::LayoutState) {
|
|
let x = if constraint.max.x().is_finite() {
|
|
constraint.max.x()
|
|
} else {
|
|
constraint.min.x()
|
|
};
|
|
let y = if constraint.max.y().is_finite() {
|
|
constraint.max.y()
|
|
} else {
|
|
constraint.min.y()
|
|
};
|
|
(vec2f(x, y), ())
|
|
}
|
|
|
|
fn paint(
|
|
&mut self,
|
|
bounds: RectF,
|
|
visible_bounds: RectF,
|
|
_: &mut Self::LayoutState,
|
|
cx: &mut PaintContext,
|
|
) -> Self::PaintState {
|
|
self.0(bounds, visible_bounds, cx)
|
|
}
|
|
|
|
fn dispatch_event(
|
|
&mut self,
|
|
_: &crate::Event,
|
|
_: RectF,
|
|
_: RectF,
|
|
_: &mut Self::LayoutState,
|
|
_: &mut Self::PaintState,
|
|
_: &mut crate::EventContext,
|
|
) -> bool {
|
|
false
|
|
}
|
|
|
|
fn debug(
|
|
&self,
|
|
bounds: RectF,
|
|
_: &Self::LayoutState,
|
|
_: &Self::PaintState,
|
|
_: &DebugContext,
|
|
) -> json::Value {
|
|
json!({"type": "Canvas", "bounds": bounds.to_json()})
|
|
}
|
|
}
|