-
-
Save findzen/dbe189d571e212a6598b to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8"> | |
<title>JS Bin</title> | |
</head> | |
<body> | |
<div> | |
<button | |
is="hitbox-button" | |
></button> | |
</div> | |
<div> | |
<button | |
is="hitbox-button" | |
padding="100" | |
></button> | |
</div> | |
</body> | |
</html> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
body { | |
padding: 50px; | |
} | |
button { | |
border: 0; | |
background: red; | |
height: 100px; | |
width: 100px; | |
} | |
div { | |
border: 2px dotted blue; | |
display: inline-block; | |
margin: 50px; | |
padding: 50px; | |
} | |
div:nth-child(2) { | |
padding: 100px; | |
} | |
.in-bounds { | |
background: green; | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
;(function(window, document, undefined) { | |
'use strict'; | |
var HIT_CLASS = 'in-bounds'; | |
var PADDING = 50; | |
var btns = document.getElementsByTagName('button'); | |
addSpecialClick(btns[0], function() { | |
console.log('button 1 clicked'); | |
}); | |
addSpecialClick(btns[1], function() { | |
console.log('button 2 clicked'); | |
}); | |
var proto = Object.create(HTMLButtonElement.prototype); | |
proto.createdCallback = function() { | |
var self = this; | |
var rect = this.getBoundingClientRect(); | |
var padding = | |
this.attributes.padding && | |
this.attributes.padding.value ? | |
Number(this.attributes.padding.value) : | |
PADDING; | |
var bounds = { | |
left: rect.left - padding, | |
right: rect.right + padding, | |
top: rect.top - padding, | |
bottom: rect.bottom + padding | |
}; | |
this.addEventListener('mousedown', onMouseDown); | |
function checkBounds(x, y) { | |
if ( | |
isInBounds(bounds, x, y) | |
) { | |
self.classList.add(HIT_CLASS); | |
return; | |
} | |
self.classList.remove(HIT_CLASS); | |
} | |
// | |
// Event handlers | |
// | |
function onMouseDown(e) { | |
checkBounds(e.clientX, e.clientY); | |
document.body.addEventListener('mouseup', onMouseUp); | |
document.body.addEventListener('mousemove', onMouseMove); | |
} | |
function onMouseMove(e) { | |
checkBounds(e.clientX, e.clientY); | |
} | |
function onMouseUp(e) { | |
document.body.removeEventListener('mouseup', onMouseUp); | |
document.body.removeEventListener('mousemove', onMouseMove); | |
self.classList.remove(HIT_CLASS); | |
// Don't dispatch event if out of bounds | |
if (!isInBounds(bounds, e.clientX, e.clientY)) { | |
return; | |
} | |
self.dispatchEvent(new Event('hitbox-click', { | |
view: window, | |
bubbles: true, | |
cancelable: true, | |
clientX: e.clientX, | |
clientY: e.clientY | |
})); | |
} | |
}; | |
// Register element extending button | |
document.registerElement('hitbox-button', { | |
prototype: proto, | |
extends: 'button' | |
}); | |
function addSpecialClick(el, callback) { | |
el.addEventListener('hitbox-click', callback); | |
} | |
// Returns true if x and y are within bounds | |
function isInBounds(bounds, x, y) { | |
return x >= bounds.left && | |
x <= bounds.right && | |
y >= bounds.top && | |
y <= bounds.bottom; | |
} | |
})(window, document); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment