Nathan Sobo
1b03c5d69c
I want to use this on another branch, but it's a sweeping change, so this prepares the ground for it. This can always be reverted if it doesn't work out.
88 lines
1.9 KiB
Rust
88 lines
1.9 KiB
Rust
use std::marker::PhantomData;
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use super::Element;
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use crate::{
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json::{self, json},
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PaintContext, SceneBuilder, View, ViewContext,
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};
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use json::ToJson;
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use pathfinder_geometry::{
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rect::RectF,
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vector::{vec2f, Vector2F},
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};
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pub struct Canvas<V, F>(F, PhantomData<V>);
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impl<V, F> Canvas<V, F>
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where
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V: View,
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F: FnMut(&mut SceneBuilder, RectF, RectF, &mut V, &mut ViewContext<V>),
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{
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pub fn new(f: F) -> Self {
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Self(f, PhantomData)
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}
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}
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impl<V: View, F> Element<V> for Canvas<V, F>
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where
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F: 'static + FnMut(&mut SceneBuilder, RectF, RectF, &mut V, &mut ViewContext<V>),
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{
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type LayoutState = ();
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type PaintState = ();
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fn layout(
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&mut self,
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constraint: crate::SizeConstraint,
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_: &mut V,
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_: &mut crate::LayoutContext<V>,
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) -> (Vector2F, Self::LayoutState) {
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let x = if constraint.max.x().is_finite() {
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constraint.max.x()
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} else {
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constraint.min.x()
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};
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let y = if constraint.max.y().is_finite() {
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constraint.max.y()
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} else {
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constraint.min.y()
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};
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(vec2f(x, y), ())
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}
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fn paint(
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&mut self,
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scene: &mut SceneBuilder,
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bounds: RectF,
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visible_bounds: RectF,
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_: &mut Self::LayoutState,
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view: &mut V,
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cx: &mut PaintContext<V>,
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) -> Self::PaintState {
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self.0(scene, bounds, visible_bounds, view, cx)
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}
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fn rect_for_text_range(
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&self,
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_: std::ops::Range<usize>,
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_: RectF,
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_: RectF,
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_: &Self::LayoutState,
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_: &Self::PaintState,
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_: &V,
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_: &ViewContext<V>,
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) -> Option<RectF> {
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None
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}
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fn debug(
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&self,
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bounds: RectF,
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_: &Self::LayoutState,
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_: &Self::PaintState,
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_: &V,
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_: &ViewContext<V>,
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) -> json::Value {
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json!({"type": "Canvas", "bounds": bounds.to_json()})
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}
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}
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