Added n_clicks_previous property to Button.

Author: rmarren1

Diff for: src/components/Button.react.js

@@ -8,6 +8,7 @@ const Button = (props) => {
                 onClick={() => {
                     if (props.setProps) props.setProps({n_clicks: props.n_clicks + 1});
                     if (props.fireEvent) props.fireEvent({event: 'click'});
+                    if (props.setProps) props.setProps({n_clicks_previous: props.n_clicks + 1});
                 }}
                 {...props}
             >
@@ -24,7 +25,8 @@ const Button = (props) => {
 };
 
 Button.defaultProps = {
-    n_clicks: 0
+    n_clicks: 0,
+    n_clicks_previous: 0
 };
 
 Button.propTypes = {
@@ -46,13 +48,19 @@ Button.propTypes = {
      */
     'n_clicks': PropTypes.integer,
 
+    /**
+     * An integer that represents the number of times
+     * that this element has been clicked on prior to click event.
+     */
+    'n_clicks_previous': PropTypes.integer,
+
     /**
      * A unique identifier for the component, used to improve
      * performance by React.js while rendering components
      * See https://reactjs.org/docs/lists-and-keys.html for more info
      */
     'key': PropTypes.string,
-    
+
 
     /**
      * The element should be automatically focused after the page loaded.
@@ -155,7 +163,7 @@ Button.propTypes = {
     'fireEvent': PropTypes.func,
 
     'dashEvents': PropTypes.oneOf(['click'])
-    
+
 };
 
 export default Button;