158 lines
4.3 KiB
Rust
158 lines
4.3 KiB
Rust
use std::ops::Range;
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use crate::{
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geometry::{rect::RectF, vector::Vector2F},
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json::ToJson,
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presenter::MeasurementContext,
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DebugContext, Element, ElementBox, Event, EventContext, LayoutContext, MouseRegion,
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PaintContext, SizeConstraint,
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};
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use serde_json::json;
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pub struct Overlay {
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child: ElementBox,
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abs_position: Option<Vector2F>,
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fit_mode: OverlayFitMode,
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hoverable: bool,
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}
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#[derive(Copy, Clone)]
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pub enum OverlayFitMode {
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SnapToWindow,
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FlipAlignment,
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None,
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}
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impl Overlay {
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pub fn new(child: ElementBox) -> Self {
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Self {
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child,
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abs_position: None,
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fit_mode: OverlayFitMode::None,
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hoverable: false,
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}
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}
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pub fn with_abs_position(mut self, position: Vector2F) -> Self {
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self.abs_position = Some(position);
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self
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}
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pub fn fit_mode(mut self, fit_mode: OverlayFitMode) -> Self {
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self.fit_mode = fit_mode;
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self
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}
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pub fn hoverable(mut self, hoverable: bool) -> Self {
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self.hoverable = hoverable;
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self
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}
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}
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impl Element for Overlay {
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type LayoutState = Vector2F;
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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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let constraint = if self.abs_position.is_some() {
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SizeConstraint::new(Vector2F::zero(), cx.window_size)
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} else {
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constraint
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};
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let size = self.child.layout(constraint, cx);
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(Vector2F::zero(), size)
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}
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fn paint(
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&mut self,
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bounds: RectF,
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_: RectF,
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size: &mut Self::LayoutState,
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cx: &mut PaintContext,
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) {
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let mut bounds = RectF::new(self.abs_position.unwrap_or(bounds.origin()), *size);
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cx.scene.push_stacking_context(None);
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if self.hoverable {
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cx.scene.push_mouse_region(MouseRegion {
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view_id: cx.current_view_id(),
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bounds,
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..Default::default()
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});
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}
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match self.fit_mode {
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OverlayFitMode::SnapToWindow => {
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// Snap the right edge of the overlay to the right edge of the window if
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// its horizontal bounds overflow.
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if bounds.lower_right().x() > cx.window_size.x() {
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bounds.set_origin_x((cx.window_size.x() - bounds.width()).max(0.));
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}
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// Snap the bottom edge of the overlay to the bottom edge of the window if
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// its vertical bounds overflow.
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if bounds.lower_right().y() > cx.window_size.y() {
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bounds.set_origin_y((cx.window_size.y() - bounds.height()).max(0.));
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}
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}
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OverlayFitMode::FlipAlignment => {
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// Right-align overlay if its horizontal bounds overflow.
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if bounds.lower_right().x() > cx.window_size.x() {
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bounds.set_origin_x(bounds.origin_x() - bounds.width());
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}
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// Bottom-align overlay if its vertical bounds overflow.
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if bounds.lower_right().y() > cx.window_size.y() {
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bounds.set_origin_y(bounds.origin_y() - bounds.height());
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}
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}
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OverlayFitMode::None => {}
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}
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self.child.paint(bounds.origin(), bounds, cx);
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cx.scene.pop_stacking_context();
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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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_: RectF,
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_: 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 rect_for_text_range(
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&self,
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range_utf16: 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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cx: &MeasurementContext,
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) -> Option<RectF> {
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self.child.rect_for_text_range(range_utf16, cx)
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}
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fn debug(
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&self,
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_: 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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"type": "Overlay",
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"abs_position": self.abs_position.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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