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/*
This file is part of TALER
(C) 2016 Inria
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* General helper components
*
* @author Florian Dold
*/
export interface StateHolder<T> {
(): T;
(newState: T): void;
}
/**
* Component that doesn't hold its state in one object,
* but has multiple state holders.
*/
export abstract class ImplicitStateComponent<PropType> extends preact.Component<PropType, any> {
makeState<StateType>(initial: StateType): StateHolder<StateType> {
let state: StateType = initial;
return (s?: StateType): StateType => {
if (s !== undefined) {
state = s;
// In preact, this will always schedule a (debounced) redraw
this.setState({} as any);
}
return state;
};
}
}
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