Add possibility to cancel from onShow event

README.md

@@ -116,7 +116,7 @@ const HeaderWithTooltip = withTooltip(Header, {
 |stickyDuration|200|Any number (milliseconds)|Specifies the 'smoothing' transition when the popper's position updates as its element moves.|
 |tag|`div`|A HTML element tag name e.g. `span`|Specifies the HTML element used to wrap the content that triggers the tooltip. When using a tooltip inline, `span` is more likely to be valid markup. When using a higher-order component with a block-level element, a `div` or `a` is more likely to be valid markup.|
 |touchHold|false|`true` `false`|Changes the trigger behavior on touch devices. It will change it from a tap to show and tap off to hide, to a tap and hold to show, and a release to hide.|
-|onShow|noop|function|Callback when the tooltip has been triggered and has started to transition in|
+|onShow|noop|function|Callback when the tooltip has been triggered and has started to transition in, return `false` to cancel the show|
 |onShown|noop|function|Callback when the tooltip has fully transitioned in and is showing|
 |onHide|noop|function|Callback when the tooltip has begun to transition out|
 |onHidden|noop|function|Callback when the tooltip has fully transitioned out and is hidden|

src/Tooltip/js/tippy.js

@@ -169,7 +169,9 @@ class Tippy {
       return
     }
 
-    this.callbacks.show.call(popper)
+    if (this.callbacks.show.call(popper, data.el) === false) {
+      return
+    }
 
     // Custom react
     if (data.settings && data.settings.open === false) {