react app

react-app/node_modules/react/lib/ReactStateSetters.js

@@ -0,0 +1,104 @@
+/**
+ * Copyright 2013-2015, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule ReactStateSetters
+ */
+
+'use strict';
+
+var ReactStateSetters = {
+  /**
+   * Returns a function that calls the provided function, and uses the result
+   * of that to set the component's state.
+   *
+   * @param {ReactCompositeComponent} component
+   * @param {function} funcReturningState Returned callback uses this to
+   *                                      determine how to update state.
+   * @return {function} callback that when invoked uses funcReturningState to
+   *                    determined the object literal to setState.
+   */
+  createStateSetter: function(component, funcReturningState) {
+    return function(a, b, c, d, e, f) {
+      var partialState = funcReturningState.call(component, a, b, c, d, e, f);
+      if (partialState) {
+        component.setState(partialState);
+      }
+    };
+  },
+
+  /**
+   * Returns a single-argument callback that can be used to update a single
+   * key in the component's state.
+   *
+   * Note: this is memoized function, which makes it inexpensive to call.
+   *
+   * @param {ReactCompositeComponent} component
+   * @param {string} key The key in the state that you should update.
+   * @return {function} callback of 1 argument which calls setState() with
+   *                    the provided keyName and callback argument.
+   */
+  createStateKeySetter: function(component, key) {
+    // Memoize the setters.
+    var cache = component.__keySetters || (component.__keySetters = {});
+    return cache[key] || (cache[key] = createStateKeySetter(component, key));
+  }
+};
+
+function createStateKeySetter(component, key) {
+  // Partial state is allocated outside of the function closure so it can be
+  // reused with every call, avoiding memory allocation when this function
+  // is called.
+  var partialState = {};
+  return function stateKeySetter(value) {
+    partialState[key] = value;
+    component.setState(partialState);
+  };
+}
+
+ReactStateSetters.Mixin = {
+  /**
+   * Returns a function that calls the provided function, and uses the result
+   * of that to set the component's state.
+   *
+   * For example, these statements are equivalent:
+   *
+   *   this.setState({x: 1});
+   *   this.createStateSetter(function(xValue) {
+   *     return {x: xValue};
+   *   })(1);
+   *
+   * @param {function} funcReturningState Returned callback uses this to
+   *                                      determine how to update state.
+   * @return {function} callback that when invoked uses funcReturningState to
+   *                    determined the object literal to setState.
+   */
+  createStateSetter: function(funcReturningState) {
+    return ReactStateSetters.createStateSetter(this, funcReturningState);
+  },
+
+  /**
+   * Returns a single-argument callback that can be used to update a single
+   * key in the component's state.
+   *
+   * For example, these statements are equivalent:
+   *
+   *   this.setState({x: 1});
+   *   this.createStateKeySetter('x')(1);
+   *
+   * Note: this is memoized function, which makes it inexpensive to call.
+   *
+   * @param {string} key The key in the state that you should update.
+   * @return {function} callback of 1 argument which calls setState() with
+   *                    the provided keyName and callback argument.
+   */
+  createStateKeySetter: function(key) {
+    return ReactStateSetters.createStateKeySetter(this, key);
+  }
+};
+
+module.exports = ReactStateSetters;