StratoSDK is a framework with a declarative approach similar to Flutter/React, written and designed entirely for Rust.
| 1 | use pathfinder_geometry::{rect::RectF, vector::Vector2F}; |
| 2 | |
| 3 | use super::Point; |
| 4 | use crate::{ |
| 5 | event::DispatchedEvent, AfterLayoutContext, AppContext, ClipBounds, Element, Event, |
| 6 | EventContext, LayoutContext, PaintContext, SizeConstraint, |
| 7 | }; |
| 8 | |
| 9 | type DismissCallback = Box<dyn FnMut(&mut EventContext, &AppContext)>; |
| 10 | |
| 11 | /// Element that is used to dismiss its child element. |
| 12 | /// Clicking on this element is equivalent to clicking outside the child element. |
| 13 | pub struct Dismiss { |
| 14 | child: Box<dyn Element>, |
| 15 | dismiss_handler: Option<DismissCallback>, |
| 16 | origin: Option<Point>, |
| 17 | /// Whether or not the element should make the rest of the window unresponsive. All mouse events |
| 18 | /// are handled by the [`Dismiss`] rather than being propagated further down in the element |
| 19 | /// hierarchy. |
| 20 | prevent_interaction_with_other_elements: bool, |
| 21 | } |
| 22 | |
| 23 | impl Dismiss { |
| 24 | pub fn new(child: Box<dyn Element>) -> Self { |
| 25 | Self { |
| 26 | child, |
| 27 | dismiss_handler: None, |
| 28 | origin: None, |
| 29 | prevent_interaction_with_other_elements: false, |
| 30 | } |
| 31 | } |
| 32 | |
| 33 | /// Attach a handler for when the dismiss is clicked |
| 34 | pub fn on_dismiss<F>(mut self, handler: F) -> Self |
| 35 | where |
| 36 | F: 'static + FnMut(&mut EventContext, &AppContext), |
| 37 | { |
| 38 | self.dismiss_handler = Some(Box::new(handler)); |
| 39 | self |
| 40 | } |
| 41 | |
| 42 | /// Prevents interactions with any other elements outside of the [`Dismiss`]. All events are |
| 43 | /// handled by this element and are _not_ propagated further down the element hierarchy. |
| 44 | pub fn prevent_interaction_with_other_elements(mut self) -> Self { |
| 45 | self.prevent_interaction_with_other_elements = true; |
| 46 | self |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | impl Element for Dismiss { |
| 51 | fn layout( |
| 52 | &mut self, |
| 53 | constraint: SizeConstraint, |
| 54 | ctx: &mut LayoutContext, |
| 55 | app: &AppContext, |
| 56 | ) -> Vector2F { |
| 57 | self.child.layout(constraint, ctx, app) |
| 58 | } |
| 59 | |
| 60 | fn after_layout(&mut self, ctx: &mut AfterLayoutContext, app: &AppContext) { |
| 61 | self.child.after_layout(ctx, app); |
| 62 | } |
| 63 | |
| 64 | fn paint(&mut self, origin: Vector2F, ctx: &mut PaintContext, app: &AppContext) { |
| 65 | self.origin = Some(Point::from_vec2f(origin, ctx.scene.z_index())); |
| 66 | |
| 67 | if !self.prevent_interaction_with_other_elements { |
| 68 | // Create a new layer for the contents so that we can distinguish click events that happen |
| 69 | // outside of the child element we want to dismiss |
| 70 | ctx.scene.start_layer(ClipBounds::ActiveLayer); |
| 71 | self.child.paint(origin, ctx, app); |
| 72 | ctx.scene.stop_layer(); |
| 73 | } else { |
| 74 | // Create an invisible rect underneath the child that spans the window and prevents all |
| 75 | // underlayed elements from responding to events, until a click occurs. |
| 76 | ctx.scene |
| 77 | .draw_rect_with_hit_recording(RectF::new(Vector2F::zero(), ctx.window_size)); |
| 78 | self.child.paint(origin, ctx, app); |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | fn dispatch_event( |
| 83 | &mut self, |
| 84 | event: &DispatchedEvent, |
| 85 | ctx: &mut EventContext, |
| 86 | app: &AppContext, |
| 87 | ) -> bool { |
| 88 | if self.child.dispatch_event(event, ctx, app) { |
| 89 | return true; |
| 90 | } |
| 91 | |
| 92 | let z_index = self.z_index().unwrap(); |
| 93 | |
| 94 | match ( |
| 95 | self.dismiss_handler.as_mut(), |
| 96 | event.at_z_index(z_index, ctx), |
| 97 | ) { |
| 98 | // If the event is available at the root z-index, that means it isn't covered by the |
| 99 | // child element, which means the user is clicking outside of the child element |
| 100 | (Some(handler), Some(Event::LeftMouseDown { .. })) => { |
| 101 | handler(ctx, app); |
| 102 | } |
| 103 | (None, Some(Event::LeftMouseDown { .. })) => { |
| 104 | log::warn!("Dismiss underlay was clicked but no handler was set!"); |
| 105 | } |
| 106 | _ => {} |
| 107 | }; |
| 108 | |
| 109 | false |
| 110 | } |
| 111 | |
| 112 | fn size(&self) -> Option<Vector2F> { |
| 113 | self.child.size() |
| 114 | } |
| 115 | |
| 116 | fn origin(&self) -> Option<Point> { |
| 117 | self.origin |
| 118 | } |
| 119 | |
| 120 | #[cfg(any(test, feature = "test-util"))] |
| 121 | fn debug_text_content(&self) -> Option<String> { |
| 122 | self.child.debug_text_content() |
| 123 | } |
| 124 | } |
| 125 |