109 lines
3.0 KiB
Rust
109 lines
3.0 KiB
Rust
use crate::{
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font_cache::FamilyId,
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fonts::Properties,
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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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AfterLayoutContext, DebugContext, Element, ElementBox, Event, EventContext, LayoutContext,
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PaintContext, SizeConstraint,
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};
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pub struct LineBox {
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child: ElementBox,
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family_id: FamilyId,
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font_size: f32,
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font_properties: Properties,
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}
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impl LineBox {
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pub fn new(family_id: FamilyId, font_size: f32, child: ElementBox) -> Self {
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Self {
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child,
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family_id,
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font_size,
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font_properties: Properties::default(),
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}
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}
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}
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impl Element for LineBox {
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type LayoutState = f32;
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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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cx: &mut LayoutContext,
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) -> (Vector2F, Self::LayoutState) {
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match cx
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.font_cache
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.select_font(self.family_id, &self.font_properties)
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{
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Ok(font_id) => {
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let line_height = cx.font_cache.line_height(font_id, self.font_size);
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let character_height = cx.font_cache.ascent(font_id, self.font_size)
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+ cx.font_cache.descent(font_id, self.font_size);
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let child_max = vec2f(constraint.max.x(), character_height);
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let child_size = self.child.layout(
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SizeConstraint::new(constraint.min.min(child_max), child_max),
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cx,
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);
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let size = vec2f(child_size.x(), line_height);
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(size, (line_height - character_height) / 2.)
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}
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Err(error) => {
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log::error!("can't find font for LineBox: {}", error);
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(constraint.min, 0.0)
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}
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}
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}
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fn after_layout(
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&mut self,
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_: Vector2F,
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_: &mut Self::LayoutState,
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cx: &mut AfterLayoutContext,
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) {
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self.child.after_layout(cx);
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}
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fn paint(
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&mut self,
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bounds: pathfinder_geometry::rect::RectF,
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padding_top: &mut f32,
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cx: &mut PaintContext,
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) -> Self::PaintState {
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self.child
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.paint(bounds.origin() + vec2f(0., *padding_top), cx);
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}
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fn dispatch_event(
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&mut self,
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event: &Event,
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_: pathfinder_geometry::rect::RectF,
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_: &mut Self::LayoutState,
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_: &mut Self::PaintState,
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cx: &mut EventContext,
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) -> bool {
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self.child.dispatch_event(event, cx)
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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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cx: &DebugContext,
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) -> serde_json::Value {
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json!({
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"bounds": bounds.to_json(),
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"font_family": cx.font_cache.family_name(self.family_id).unwrap(),
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"font_size": self.font_size,
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"font_properties": self.font_properties.to_json(),
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"child": self.child.debug(cx),
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})
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}
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}
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