Squashed 'thirdparty/preact/' content from commit b2d90cc

git-subtree-dir: thirdparty/preact
git-subtree-split: b2d90cc116f1d1998f7a7c98dc6986bf4c1841f4

1 files changed, 28 insertions, 0 deletions

diff --git a/src/linked-state.js b/src/linked-state.js
new file mode 100644
index 000000000..ed72bd8bc
--- /dev/null
+++ b/src/linked-state.js
@@ -0,0 +1,28 @@
+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('.'),
+		p0 = path[0];
+	return function(e) {
+		let t = e && e.currentTarget || this,
+			s = component.state,
+			obj = s,
+			v = isString(eventPath) ? delve(e, eventPath) : t.nodeName ? ((t.nodeName+t.type).match(/^input(che|rad)/i) ? t.checked : t.value) : e,
+			i;
+		if (path.length>1) {
+			for (i=0; i<path.length-1; i++) {
+				obj = obj[path[i]] || (obj[path[i]] = {});
+			}
+			obj[path[i]] = v;
+			v = s[p0];
+		}
+		component.setState({ [p0]: v });
+	};
+}