Implement onKeyDown / onKeyUp & Key#isDown(key).

src/load.js

@@ -69,7 +69,9 @@ var sources = [
 	'src/util/Element.js',
 	'src/util/Event.js',
 	'src/util/Numerical.js',
-	'src/util/PaperScript.js'
+	'src/util/PaperScript.js',
+
+	'src/ui/Key.js'
 ];
 
 // Load unit tests after library if asked to do so

src/paper.js

@@ -118,4 +118,5 @@ Base.inject({
 //#include "util/Numerical.js"
 //#include "util/PaperScript.js"
 
+//#include "ui/Key.js"
 };

src/ui/Key.js

@@ -0,0 +1,61 @@
+var Key = new function() {
+	// TODO: make sure the keys are called the same in Scriptographer
+	var keys = {
+		 '8': 'backspace',
+		'13': 'enter',
+		'27': 'escape',
+		'32': 'space',
+		'37': 'left',
+		'38': 'up',
+		'39': 'right',
+		'40': 'down',
+		'46': 'delete',
+		
+	};
+	var modifierNames = [
+		'shift', 'shiftKey',
+		'control', 'ctrlKey',
+		'alt', 'altKey',
+		'command', 'metaKey'
+		// TODO: capslock
+	];
+	var activeKeys = {};
+	
+	var eventHandlers = Base.each(['keyDown', 'keyUp'], function(type) {
+		var toolHandler = 'on' + Base.capitalize(type),
+			down = type == 'keyDown';
+		this[type.toLowerCase()] = function(event) {
+			var code = event.which || event.keyCode,
+				key = keys[code] || String.fromCharCode(code).toLowerCase(),
+				modifiers = {};
+			activeKeys[key] = down;
+			// Add the modifier keys to or remove from the activeKeys
+			// and construct the modifiers object to be passed to the
+			// key event
+			for (var i = 0, l = modifierNames.length; i < l; i += 2) {
+				var modifierKey = modifierNames[i];
+				if ((down && event[modifierNames[i + 1]])
+						|| (!down && modifierKey)) {
+					activeKeys[modifierKey] = down;
+				}
+				modifiers[modifierKey] = down;
+			}
+			
+			if(paper.tool[toolHandler]) {
+				paper.tool[toolHandler]({
+					keyCode: code,
+					character: key,
+					modifiers: modifiers
+				});
+			}
+		}
+	}, {});
+	
+	Event.add(document, eventHandlers);
+	
+	return {
+		isDown: function(key) {
+			return !!activeKeys[key];
+		}
+	};
+};

src/util/PaperScript.js

@@ -131,13 +131,13 @@ var PaperScript = new function() {
 
 	function run(code) {
 		with (paper) {
-			paper.tool = /onMouse(?:Up|Down|Move|Drag)/.test(code) && new Tool();
+			paper.tool = /on(?:Key|Mouse)(?:Up|Down|Move|Drag)/.test(code) && new Tool();
 			var res = eval(compile(code)),
 				doc = paper.document;
 			if (paper.tool) {
 				Base.each(['onEditOptions', 'onOptions', 'onSelect',
 					'onDeselect', 'onReselect', 'onMouseDown', 'onMouseUp',
-					'onMouseDrag', 'onMouseMove'], function(key) {
+					'onMouseDrag', 'onMouseMove', 'onKeyDown', 'onKeyUp'], function(key) {
 					try {
 						paper.tool[key] = eval(key);
 					} catch (e) {