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/**
* Copyright 2013-present, 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.
*
*/
'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;
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