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add mouse wheel listener to numbercontrollerbox #230

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add mouse wheel listener to numbercontrollerbox #230

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9 changes: 9 additions & 0 deletions src/dat/controllers/NumberControllerBox.js
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,8 @@ class NumberControllerBox extends NumberController {

const _this = this;

const mousewheelevt = (/Firefox/i.test(navigator.userAgent)) ? 'DOMMouseScroll' : 'mousewheel';

/**
* {Number} Previous mouse y position
* @ignore
Expand Down Expand Up @@ -84,6 +86,12 @@ class NumberControllerBox extends NumberController {
prevY = e.clientY;
}

function onMouseWheel(e) {
e.preventDefault();
const direction = ((e.deltaY || -e.wheelDelta || e.detail) >> 10) || 1;
_this.setValue(_this.getValue() + direction * _this.__impliedStep);
}

this.__input = document.createElement('input');
this.__input.setAttribute('type', 'text');

Expand All @@ -92,6 +100,7 @@ class NumberControllerBox extends NumberController {
dom.bind(this.__input, 'change', onChange);
dom.bind(this.__input, 'blur', onBlur);
dom.bind(this.__input, 'mousedown', onMouseDown);
dom.bind(this.__input, mousewheelevt, onMouseWheel);
dom.bind(this.__input, 'keydown', function(e) {
// When pressing enter, you can be as precise as you want.
if (e.keyCode === 13) {
Expand Down