90 lines
1.8 KiB
Rust
90 lines
1.8 KiB
Rust
use std::ops::Range;
|
|
|
|
use crate::{
|
|
geometry::{
|
|
rect::RectF,
|
|
vector::{vec2f, Vector2F},
|
|
},
|
|
json::{json, ToJson},
|
|
LayoutContext, PaintContext, SceneBuilder, ViewContext,
|
|
};
|
|
use crate::{Element, SizeConstraint};
|
|
|
|
#[derive(Default)]
|
|
pub struct Empty {
|
|
collapsed: bool,
|
|
}
|
|
|
|
impl Empty {
|
|
pub fn new() -> Self {
|
|
Self::default()
|
|
}
|
|
|
|
pub fn collapsed(mut self) -> Self {
|
|
self.collapsed = true;
|
|
self
|
|
}
|
|
}
|
|
|
|
impl<V: 'static> Element<V> for Empty {
|
|
type LayoutState = ();
|
|
type PaintState = ();
|
|
|
|
fn layout(
|
|
&mut self,
|
|
constraint: SizeConstraint,
|
|
_: &mut V,
|
|
_: &mut LayoutContext<V>,
|
|
) -> (Vector2F, Self::LayoutState) {
|
|
let x = if constraint.max.x().is_finite() && !self.collapsed {
|
|
constraint.max.x()
|
|
} else {
|
|
constraint.min.x()
|
|
};
|
|
let y = if constraint.max.y().is_finite() && !self.collapsed {
|
|
constraint.max.y()
|
|
} else {
|
|
constraint.min.y()
|
|
};
|
|
|
|
(vec2f(x, y), ())
|
|
}
|
|
|
|
fn paint(
|
|
&mut self,
|
|
_: &mut SceneBuilder,
|
|
_: RectF,
|
|
_: RectF,
|
|
_: &mut Self::LayoutState,
|
|
_: &mut V,
|
|
_: &mut PaintContext<V>,
|
|
) -> Self::PaintState {
|
|
}
|
|
|
|
fn rect_for_text_range(
|
|
&self,
|
|
_: Range<usize>,
|
|
_: RectF,
|
|
_: RectF,
|
|
_: &Self::LayoutState,
|
|
_: &Self::PaintState,
|
|
_: &V,
|
|
_: &ViewContext<V>,
|
|
) -> Option<RectF> {
|
|
None
|
|
}
|
|
|
|
fn debug(
|
|
&self,
|
|
bounds: RectF,
|
|
_: &Self::LayoutState,
|
|
_: &Self::PaintState,
|
|
_: &V,
|
|
_: &ViewContext<V>,
|
|
) -> serde_json::Value {
|
|
json!({
|
|
"type": "Empty",
|
|
"bounds": bounds.to_json(),
|
|
})
|
|
}
|
|
}
|