86 lines
1.7 KiB
Rust
86 lines
1.7 KiB
Rust
use std::ops::Range;
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use crate::{
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geometry::{
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rect::RectF,
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vector::{vec2f, Vector2F},
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},
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json::{json, ToJson},
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presenter::MeasurementContext,
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DebugContext,
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};
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use crate::{Element, LayoutContext, PaintContext, SizeConstraint};
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#[derive(Default)]
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pub struct Empty {
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collapsed: bool,
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}
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impl Empty {
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pub fn new() -> Self {
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Self::default()
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}
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pub fn collapsed(mut self) -> Self {
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self.collapsed = true;
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self
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}
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}
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impl Element for Empty {
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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: SizeConstraint,
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_: &mut LayoutContext,
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) -> (Vector2F, Self::LayoutState) {
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let x = if constraint.max.x().is_finite() && !self.collapsed {
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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() && !self.collapsed {
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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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_: RectF,
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_: RectF,
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_: &mut Self::LayoutState,
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_: &mut PaintContext,
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) -> Self::PaintState {
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}
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fn rect_for_text_range(
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&self,
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_: 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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_: &MeasurementContext,
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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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_: &DebugContext,
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) -> serde_json::Value {
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json!({
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"type": "Empty",
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"bounds": bounds.to_json(),
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})
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}
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}
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