Method mark

src/elements/element.rs:1046–1077

(&self)

    }

    fn mark(&self) {
        let mut comp = self.as_ref().borrow_mut();

        assert!(
            !comp.destroyed,
            "Widget was already destroyed but is being interacted with"
        );

        if let Some(canvas) = comp.canvas.as_ref() {
            if canvas.id() == self.id() {
                return;
            }
        }

        let pre = if let Some(ref canvas) = comp.canvas.as_ref() {
            if let Some(marked) = canvas.marked {
                marked == self.id()
            } else {
                false
            }
        } else {
            false
        };

        if let Some(ref mut canvas) = comp.canvas.as_mut() {
            canvas.marked = Some(self.id());
        }

        if !pre && comp.onmarked.is_some() {
            let _ = comp.onmarked.get().try_send(true);
        }
    }

    fn unmark(&self) {
        let mut comp = self.as_ref().borrow_mut();