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Event

roost_ui::events

Trait Event 

Source 
pub trait Event: Debug + Downcast {
    // Required method
    fn pass(
        self: Box<Self>,
        _ctx: &mut Context,
        children: &Vec<((f32, f32), (f32, f32))>,
    ) -> Vec<Option<Box<dyn Event>>>;
}
Expand description

Implement the Event trait to allow a structure to be used in an event query.

Required Methods§

Source

fn pass( self: Box<Self>, _ctx: &mut Context, children: &Vec<((f32, f32), (f32, f32))>, ) -> Vec<Option<Box<dyn Event>>>

Optionally return a clone to continue passing the event to children, or None to stop propagation. Can also modify the event before passing it on.

Implementations§

Source§

impl dyn Event

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pub fn is<__T: Event>(&self) -> bool

Returns true if the trait object wraps an object of type __T.

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pub fn downcast<__T: Event>(self: Box<Self>) -> Result<Box<__T>, Box<Self>>

Returns a boxed object from a boxed trait object if the underlying object is of type __T. Returns the original boxed trait if it isn’t.

Source

pub fn downcast_rc<__T: Event>(self: Rc<Self>) -> Result<Rc<__T>, Rc<Self>>

Returns an Rc-ed object from an Rc-ed trait object if the underlying object is of type __T. Returns the original Rc-ed trait if it isn’t.

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pub fn downcast_ref<__T: Event>(&self) -> Option<&__T>

Returns a reference to the object within the trait object if it is of type __T, or None if it isn’t.

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pub fn downcast_mut<__T: Event>(&mut self) -> Option<&mut __T>

Returns a mutable reference to the object within the trait object if it is of type __T, or None if it isn’t.

Implementors§