1 files changed, 24 insertions, 0 deletions
diff --git a/thirdparty/preact/src/linked-state.js b/thirdparty/preact/src/linked-state.js
new file mode 100644
index 000000000..b6959df73
--- /dev/null
+++ b/thirdparty/preact/src/linked-state.js
@@ -0,0 +1,24 @@
+import { isString, delve } from './util';
+
+/** Create an Event handler function that sets a given state property.
+ *	@param {Component} component	The component whose state should be updated
+ *	@param {string} key				A dot-notated key path to update in the component's state
+ *	@param {string} eventPath		A dot-notated key path to the value that should be retrieved from the Event or component
+ *	@returns {function} linkedStateHandler
+ *	@private
+ */
+export function createLinkedState(component, key, eventPath) {
+	let path = key.split('.');
+	return function(e) {
+		let t = e && e.target || this,
+			state = {},
+			obj = state,
+			v = isString(eventPath) ? delve(e, eventPath) : t.nodeName ? (t.type.match(/^che|rad/) ? t.checked : t.value) : e,
+			i = 0;
+		for ( ; i<path.length-1; i++) {
+			obj = obj[path[i]] || (obj[path[i]] = !i && component.state[path[i]] || {});
+		}
+		obj[path[i]] = v;
+		component.setState(state);
+	};
+}