Trait druid::AppDelegate

pub trait AppDelegate<T: Data> {
    fn event(
        &mut self, 
        event: Event, 
        data: &mut T, 
        env: &Env, 
        ctx: &mut DelegateCtx, 
        win_ctx: &mut dyn WinCtx
    ) -> Option<Event> { ... }
    fn window_added(
        &mut self, 
        id: WindowId, 
        data: &mut T, 
        env: &Env, 
        ctx: &mut DelegateCtx
    ) { ... }
    fn window_removed(
        &mut self, 
        id: WindowId, 
        data: &mut T, 
        env: &Env, 
        ctx: &mut DelegateCtx
    ) { ... }
}

A type that provides hooks for handling and modifying top-level events.

The AppDelegate is a trait that is allowed to handle and modify events before they are passed down the widget tree.

It is a natural place for things like window and menu management.

You customize the AppDelegate by implementing its methods on your own type.

Provided methods

fn event(
    &mut self,
    event: Event,
    data: &mut T,
    env: &Env,
    ctx: &mut DelegateCtx,
    win_ctx: &mut dyn WinCtx
) -> Option<Event>

The AppDelegate's event handler. This function receives all events, before they are passed down the tree.

The return value of this function will be passed down the tree. This can be the even that was passed in, a different event, or no event. In all cases, the update method will be called as usual.

fn window_added(
    &mut self,
    id: WindowId,
    data: &mut T,
    env: &Env,
    ctx: &mut DelegateCtx
)

The handler for window creation events. This function is called after a window has been added, allowing you to customize the window creation behavior of your app.

fn window_removed(
    &mut self,
    id: WindowId,
    data: &mut T,
    env: &Env,
    ctx: &mut DelegateCtx
)

The handler for window deletion events. This function is called after a window has been removed.

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Implementors

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