feat(overridePosition): Add "overridePosition" property to handle border cases and customize position

Author: sonnenhaft

README.md

@@ -73,6 +73,7 @@ className	|   data-class  |  String  |   | extra custom class, can use !importan
  getContent | null | Func or Array | (dataTip) => {}, [(dataTip) => {}, Interval] | Generate the tip content dynamically
  afterShow | null | Func | (evt) => {} | Function that will be called after tooltip show, with event that triggered show
  afterHide | null | Func | (evt) => {} | Function that will be called after tooltip hide, with event that triggered hide
+ overridePosition | null | Func | ({left:number, top: number}, currentEvent, currentTarget, node, place, desiredPlace, effect, offset) => ({left: number, top: number}) | Function that will replace tooltip position with custom one
  disable | data-tip-disable | Bool | true, false | Disable the tooltip behaviour, default is false
  scrollHide | data-scroll-hide | Bool | true, false | Hide the tooltip when scrolling, default is true
  resizeHide | null | Bool | true, false | Hide the tooltip when resizing the window, default is true

src/index.js

@@ -53,6 +53,7 @@ class ReactTooltip extends React.Component {
     getContent: PropTypes.any,
     afterShow: PropTypes.func,
     afterHide: PropTypes.func,
+    overridePosition: PropTypes.func,
     disable: PropTypes.bool,
     scrollHide: PropTypes.bool,
     resizeHide: PropTypes.bool,
@@ -309,6 +310,10 @@ class ReactTooltip extends React.Component {
     let effect = switchToSolid && 'solid' || this.getEffect(e.currentTarget)
     let offset = e.currentTarget.getAttribute('data-offset') || this.props.offset || {}
     let result = getPosition(e, e.currentTarget, this.tooltipRef, desiredPlace, desiredPlace, effect, offset)
+    if (result.position && this.props.overridePosition) {
+      result.position = this.props.overridePosition(result.position, e.currentTarget, this.tooltipRef, desiredPlace, desiredPlace, effect, offset)
+    }
+
     let place = result.isNewState ? result.newState.place : desiredPlace
 
     // To prevent previously created timers from triggering
@@ -480,7 +485,10 @@ class ReactTooltip extends React.Component {
   updatePosition () {
     const {currentEvent, currentTarget, place, desiredPlace, effect, offset} = this.state
     const node = this.tooltipRef
-    const result = getPosition(currentEvent, currentTarget, node, place, desiredPlace, effect, offset)
+    let result = getPosition(currentEvent, currentTarget, node, place, desiredPlace, effect, offset)
+    if (result.position && this.props.overridePosition) {
+      result.position = this.props.overridePosition(result.position, currentEvent, currentTarget, node, place, desiredPlace, effect, offset)
+    }
 
     if (result.isNewState) {
       // Switch to reverse placement