85 lines
2.6 KiB
Rust
85 lines
2.6 KiB
Rust
use super::{AppContext, Element, MutableAppContext};
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use crate::{
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fonts::{FamilyId, FontId, Properties},
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geometry::vector::{vec2f, Vector2F},
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AfterLayoutContext, Event, EventContext, LayoutContext, PaintContext, SizeConstraint,
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};
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pub struct LineBox {
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child: Box<dyn Element>,
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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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font_id: Option<FontId>,
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size: Option<Vector2F>,
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}
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impl LineBox {
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pub fn new(family_id: FamilyId, font_size: f32, child: Box<dyn Element>) -> 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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font_id: None,
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size: None,
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}
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}
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}
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impl Element for LineBox {
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fn layout(
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&mut self,
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constraint: SizeConstraint,
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ctx: &mut LayoutContext,
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app: &AppContext,
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) -> Vector2F {
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match ctx
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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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self.font_id = Some(font_id);
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let line_height = ctx.font_cache.bounding_box(font_id, self.font_size).y();
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let child_max = vec2f(
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constraint.max.x(),
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ctx.font_cache.ascent(font_id, self.font_size)
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- ctx.font_cache.descent(font_id, self.font_size),
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);
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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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ctx,
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app,
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);
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let size = vec2f(child_size.x(), line_height);
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self.size = Some(size);
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size
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}
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Err(error) => {
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log::error!("can't layout LineBox: {}", error);
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self.size = Some(constraint.min);
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constraint.min
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}
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}
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}
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fn after_layout(&mut self, ctx: &mut AfterLayoutContext, app: &mut MutableAppContext) {
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self.child.after_layout(ctx, app);
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}
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fn paint(&mut self, origin: Vector2F, ctx: &mut PaintContext, app: &AppContext) {
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if let Some(font_id) = self.font_id {
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let descent = ctx.font_cache.descent(font_id, self.font_size);
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self.child.paint(origin + vec2f(0.0, -descent), ctx, app);
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}
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}
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fn size(&self) -> Option<Vector2F> {
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self.size
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}
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fn dispatch_event(&self, event: &Event, ctx: &mut EventContext, app: &AppContext) -> bool {
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self.child.dispatch_event(event, ctx, app)
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}
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}
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