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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;
+ };
+ }
+} \ No newline at end of file