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mouse-listen.js
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205 lines (171 loc) · 4.64 KB
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'use strict'
module.exports = mouseListen
var mouse = require('mouse-event')
function mouseListen (element, callback) {
if (!callback) {
callback = element
element = window
}
var buttonState = 0
var x = 0
var y = 0
var mods = {
shift: false,
alt: false,
control: false,
meta: false
}
var attached = false
function updateMods (ev) {
var changed = false
if ('altKey' in ev) {
changed = changed || ev.altKey !== mods.alt
mods.alt = !!ev.altKey
}
if ('shiftKey' in ev) {
changed = changed || ev.shiftKey !== mods.shift
mods.shift = !!ev.shiftKey
}
if ('ctrlKey' in ev) {
changed = changed || ev.ctrlKey !== mods.control
mods.control = !!ev.ctrlKey
}
if ('metaKey' in ev) {
changed = changed || ev.metaKey !== mods.meta
mods.meta = !!ev.metaKey
}
return changed
}
function handleEvent (nextButtons, ev) {
var nextX = mouse.x(ev)
var nextY = mouse.y(ev)
if ('buttons' in ev) {
nextButtons = ev.buttons | 0
}
if (nextButtons !== buttonState ||
nextX !== x ||
nextY !== y ||
updateMods(ev)) {
buttonState = nextButtons | 0
x = nextX || 0
y = nextY || 0
callback && callback(buttonState, x, y, mods)
}
}
function clearState (ev) {
handleEvent(0, ev)
}
function handleBlur () {
if (buttonState ||
x ||
y ||
mods.shift ||
mods.alt ||
mods.meta ||
mods.control) {
x = y = 0
buttonState = 0
mods.shift = mods.alt = mods.control = mods.meta = false
callback && callback(0, 0, 0, mods)
}
}
function handleMods (ev) {
if (updateMods(ev)) {
callback && callback(buttonState, x, y, mods)
}
}
function handleMouseMove (ev) {
if (mouse.buttons(ev) === 0) {
handleEvent(0, ev)
} else {
handleEvent(buttonState, ev)
}
}
function handleMouseDown (ev) {
handleEvent(buttonState | mouse.buttons(ev), ev)
}
function handleMouseUp (ev) {
handleEvent(buttonState & ~mouse.buttons(ev), ev)
}
function attachListeners () {
if (attached) {
return
}
attached = true
element.addEventListener('mousemove', handleMouseMove)
element.addEventListener('mousedown', handleMouseDown)
element.addEventListener('mouseup', handleMouseUp)
element.addEventListener('mouseleave', clearState)
element.addEventListener('mouseenter', clearState)
element.addEventListener('mouseout', clearState)
element.addEventListener('mouseover', clearState)
element.addEventListener('blur', handleBlur)
element.addEventListener('keyup', handleMods)
element.addEventListener('keydown', handleMods)
element.addEventListener('keypress', handleMods)
if (element !== window) {
window.addEventListener('blur', handleBlur)
window.addEventListener('keyup', handleMods)
window.addEventListener('keydown', handleMods)
window.addEventListener('keypress', handleMods)
}
}
function detachListeners () {
if (!attached) {
return
}
attached = false
element.removeEventListener('mousemove', handleMouseMove)
element.removeEventListener('mousedown', handleMouseDown)
element.removeEventListener('mouseup', handleMouseUp)
element.removeEventListener('mouseleave', clearState)
element.removeEventListener('mouseenter', clearState)
element.removeEventListener('mouseout', clearState)
element.removeEventListener('mouseover', clearState)
element.removeEventListener('blur', handleBlur)
element.removeEventListener('keyup', handleMods)
element.removeEventListener('keydown', handleMods)
element.removeEventListener('keypress', handleMods)
if (element !== window) {
window.removeEventListener('blur', handleBlur)
window.removeEventListener('keyup', handleMods)
window.removeEventListener('keydown', handleMods)
window.removeEventListener('keypress', handleMods)
}
}
// Attach listeners
attachListeners()
var result = {
element: element
}
Object.defineProperties(result, {
enabled: {
get: function () { return attached },
set: function (f) {
if (f) {
attachListeners()
} else {
detachListeners()
}
},
enumerable: true
},
buttons: {
get: function () { return buttonState },
enumerable: true
},
x: {
get: function () { return x },
enumerable: true
},
y: {
get: function () { return y },
enumerable: true
},
mods: {
get: function () { return mods },
enumerable: true
}
})
return result
}