Trait kas::event::Handler

pub trait Handler: Core {
    type Response: From<NoResponse>;
    fn handle_action(
        &mut self, 
        tk: &dyn TkWidget, 
        action: Action, 
        number: u32
    ) -> Self::Response;
}

Event-handling aspect of a widget.

This is a companion trait to Widget. It can (optionally) be implemented by the derive(Widget) macro, or can be implemented manually.

Associated Types

type Response: From<NoResponse>

Type of message returned by this handler.

This mechanism allows type-safe handling of user-defined responses to handled actions. For example, a user may define a control panel where each button returns a unique code, or a configuration editor may return a full copy of the new configuration on completion.

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Required methods

fn handle_action(
    &mut self,
    tk: &dyn TkWidget,
    action: Action,
    number: u32
) -> Self::Response

Handle a high-level event directed at the widget identified by number, and return a user-defined msg.

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Implementors

impl Handler for Entry<()>

type Response = NoResponse

fn handle_action(     &mut self,     _tk: &dyn TkWidget,     action: Action,     num: u32 ) -> Self::Response

impl Handler for Text

type Response = NoResponse

fn handle_action(     &mut self,     _tk: &dyn TkWidget,     action: Action,     num: u32 ) -> Self::Response

impl<R: From<NoResponse>, H: Fn() -> R> Handler for TextButton<H>

type Response = R

fn handle_action(     &mut self,     _tk: &dyn TkWidget,     action: Action,     num: u32 ) -> Self::Response

impl<R: From<NoResponse>, H: Fn() -> R> Handler for Entry<H>

type Response = R

fn handle_action(     &mut self,     _tk: &dyn TkWidget,     action: Action,     num: u32 ) -> Self::Response

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