instance-js/ext/bind-keys.js

I functions

I.on("require#bindKeys", function(done) {

	function bindKeys(node, config) {
		var keysDown = [],
			copyKeyBindings = {},
			actions = config.Actions,
			keyBindings = config.KeyBindings||config,
			action;

		for( var key in keyBindings ) {

			if( key === "Actions" || key === "KeyBindings" || key === "ComboDelimiter" ) {
				continue;
			}

			action = actions && !(typeof keyBindings[key] === "function") ? actions[ keyBindings[key] ] : keyBindings[key];
			copyKeyBindings[key] = action;
		}

		node.addEventListener("keydown", function(e) {
			if( keysDown[ keysDown.length - 1 ] !== e.key ) {
				keysDown.push(e.key);
			}

			var def = keysDown.join(config.ComboDelimiter || "+");

			if( copyKeyBindings[ def ] ) {
				copyKeyBindings[ def ].call(this, e);
			}
		});

		node.addEventListener("keyup", function(e) {
			var index = keysDown.indexOf(e.key);

			if( ~index ) {
				keysDown = keysDown.slice(0, index).concat( keysDown.slice(1+index) );
			}
		});
	}

	I.proto.bindKeys = function(config) {
		for(var i=0; i<this.length; i++) {
			bindKeys(this[i], config);
		}
	}

	I.bindKeys = bindKeys;

	done();
});