WIP

2021-03-09 21:00:51 -07:00
parent a015c61337
commit 356bc41752
36 changed files with 14097 additions and 4 deletions
@@ -0,0 +1,69 @@
+use super::try_rect;
+use crate::{
+    geometry::vector::Vector2F, AfterLayoutContext, AppContext, Element, Event, EventContext,
+    LayoutContext, MutableAppContext, PaintContext, SizeConstraint,
+};
+use std::cell::RefCell;
+
+pub struct EventHandler {
+    child: Box<dyn Element>,
+    mouse_down: Option<RefCell<Box<dyn FnMut(&mut EventContext, &AppContext) -> bool>>>,
+    origin: Option<Vector2F>,
+}
+
+impl EventHandler {
+    pub fn new(child: Box<dyn Element>) -> Self {
+        Self {
+            child,
+            mouse_down: None,
+            origin: None,
+        }
+    }
+
+    pub fn on_mouse_down<F>(mut self, callback: F) -> Self
+    where
+        F: 'static + FnMut(&mut EventContext, &AppContext) -> bool,
+    {
+        self.mouse_down = Some(RefCell::new(Box::new(callback)));
+        self
+    }
+}
+
+impl Element for EventHandler {
+    fn layout(
+        &mut self,
+        constraint: SizeConstraint,
+        ctx: &mut LayoutContext,
+        app: &AppContext,
+    ) -> Vector2F {
+        self.child.layout(constraint, ctx, app)
+    }
+
+    fn after_layout(&mut self, ctx: &mut AfterLayoutContext, app: &mut MutableAppContext) {
+        self.child.after_layout(ctx, app);
+    }
+
+    fn paint(&mut self, origin: Vector2F, ctx: &mut PaintContext, app: &AppContext) {
+        self.origin = Some(origin);
+        self.child.paint(origin, ctx, app);
+    }
+
+    fn size(&self) -> Option<Vector2F> {
+        self.child.size()
+    }
+
+    fn dispatch_event(&self, event: &Event, ctx: &mut EventContext, app: &AppContext) -> bool {
+        match event {
+            Event::LeftMouseDown { position, .. } => {
+                if let Some(callback) = self.mouse_down.as_ref() {
+                    let rect = try_rect(self.origin, self.size()).unwrap();
+                    if rect.contains_point(*position) {
+                        return callback.borrow_mut()(ctx, app);
+                    }
+                }
+                false
+            }
+            _ => false,
+        }
+    }
+}