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Diffstat (limited to 'lib/components.ts')
-rw-r--r-- | lib/components.ts | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/lib/components.ts b/lib/components.ts new file mode 100644 index 000000000..fb802ab47 --- /dev/null +++ b/lib/components.ts @@ -0,0 +1,45 @@ +/* + 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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