2021-03-10 04:00:51 +00:00
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use crate::{
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AfterLayoutContext, Element, ElementBox, Event, EventContext, LayoutContext, PaintContext,
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SizeConstraint,
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};
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use pathfinder_geometry::vector::Vector2F;
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pub struct ConstrainedBox {
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child: ElementBox,
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constraint: SizeConstraint,
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}
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impl ConstrainedBox {
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pub fn new(child: ElementBox) -> Self {
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Self {
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child,
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constraint: SizeConstraint {
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min: Vector2F::zero(),
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max: Vector2F::splat(f32::INFINITY),
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},
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}
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}
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pub fn with_max_width(mut self, max_width: f32) -> Self {
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self.constraint.max.set_x(max_width);
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self
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}
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pub fn with_max_height(mut self, max_height: f32) -> Self {
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self.constraint.max.set_y(max_height);
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self
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}
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pub fn with_height(mut self, height: f32) -> Self {
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self.constraint.min.set_y(height);
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self.constraint.max.set_y(height);
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self
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}
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}
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impl Element for ConstrainedBox {
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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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mut constraint: SizeConstraint,
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ctx: &mut LayoutContext,
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) -> (Vector2F, Self::LayoutState) {
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constraint.min = constraint.min.max(self.constraint.min);
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constraint.max = constraint.max.min(self.constraint.max);
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let size = self.child.layout(constraint, ctx);
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(size, ())
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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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ctx: &mut AfterLayoutContext,
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) {
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self.child.after_layout(ctx);
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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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_: &mut Self::LayoutState,
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ctx: &mut PaintContext,
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) -> Self::PaintState {
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self.child.paint(bounds.origin(), ctx);
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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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ctx: &mut EventContext,
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) -> bool {
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self.child.dispatch_event(event, ctx)
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}
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}
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