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// THREEx.KeyboardState.js keep the current state of the keyboard. | ||
// It is possible to query it at any time. No need of an event. | ||
// This is particularly convenient in loop driven case, like in | ||
// 3D demos or games. | ||
// | ||
// # Usage | ||
// | ||
// **Step 1**: Create the object | ||
// | ||
// ```var keyboard = new THREEx.KeyboardState();``` | ||
// | ||
// **Step 2**: Query the keyboard state | ||
// | ||
// This will return true if shift and A are pressed, false otherwise | ||
// | ||
// ```keyboard.pressed("shift+A")``` | ||
// | ||
// **Step 3**: Stop listening to the keyboard | ||
// | ||
// ```keyboard.destroy()``` | ||
// | ||
// NOTE: this library may be nice as standaline. independant from three.js | ||
// - rename it keyboardForGame | ||
// | ||
// # Code | ||
// | ||
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/** @namespace */ | ||
var THREEx = THREEx || {}; | ||
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/** | ||
* - NOTE: it would be quite easy to push event-driven too | ||
* - microevent.js for events handling | ||
* - in this._onkeyChange, generate a string from the DOM event | ||
* - use this as event name | ||
*/ | ||
THREEx.KeyboardState = function() | ||
{ | ||
// to store the current state | ||
this.keyCodes = {}; | ||
this.modifiers = {}; | ||
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// create callback to bind/unbind keyboard events | ||
var self = this; | ||
this._onKeyDown = function(event){ self._onKeyChange(event, true); }; | ||
this._onKeyUp = function(event){ self._onKeyChange(event, false);}; | ||
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// bind keyEvents | ||
document.addEventListener("keydown", this._onKeyDown, false); | ||
document.addEventListener("keyup", this._onKeyUp, false); | ||
} | ||
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/** | ||
* To stop listening of the keyboard events | ||
*/ | ||
THREEx.KeyboardState.prototype.destroy = function() | ||
{ | ||
// unbind keyEvents | ||
document.removeEventListener("keydown", this._onKeyDown, false); | ||
document.removeEventListener("keyup", this._onKeyUp, false); | ||
} | ||
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THREEx.KeyboardState.MODIFIERS = ['shift', 'ctrl', 'alt', 'meta']; | ||
THREEx.KeyboardState.ALIAS = { | ||
'left' : 37, | ||
'up' : 38, | ||
'right' : 39, | ||
'down' : 40, | ||
'space' : 32, | ||
'pageup' : 33, | ||
'pagedown' : 34, | ||
'tab' : 9 | ||
}; | ||
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/** | ||
* to process the keyboard dom event | ||
*/ | ||
THREEx.KeyboardState.prototype._onKeyChange = function(event, pressed) | ||
{ | ||
// log to debug | ||
//console.log("onKeyChange", event, pressed, event.keyCode, event.shiftKey, event.ctrlKey, event.altKey, event.metaKey) | ||
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// update this.keyCodes | ||
var keyCode = event.keyCode; | ||
this.keyCodes[keyCode] = pressed; | ||
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// update this.modifiers | ||
this.modifiers['shift']= event.shiftKey; | ||
this.modifiers['ctrl'] = event.ctrlKey; | ||
this.modifiers['alt'] = event.altKey; | ||
this.modifiers['meta'] = event.metaKey; | ||
} | ||
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/** | ||
* query keyboard state to know if a key is pressed of not | ||
* | ||
* @param {String} keyDesc the description of the key. format : modifiers+key e.g shift+A | ||
* @returns {Boolean} true if the key is pressed, false otherwise | ||
*/ | ||
THREEx.KeyboardState.prototype.pressed = function(keyDesc) | ||
{ | ||
var keys = keyDesc.split("+"); | ||
for(var i = 0; i < keys.length; i++){ | ||
var key = keys[i]; | ||
var pressed; | ||
if( THREEx.KeyboardState.MODIFIERS.indexOf( key ) !== -1 ){ | ||
pressed = this.modifiers[key]; | ||
}else if( Object.keys(THREEx.KeyboardState.ALIAS).indexOf( key ) != -1 ){ | ||
pressed = this.keyCodes[ THREEx.KeyboardState.ALIAS[key] ]; | ||
}else { | ||
pressed = this.keyCodes[key.toUpperCase().charCodeAt(0)] | ||
} | ||
if( !pressed) return false; | ||
}; | ||
return true; | ||
} |
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