// attach keyboard listeners to the window
const keyboard = new pc.Keyboard(window);

Keyboard([element], [options]) 

Create a new Keyboard instance.

// attach keyboard listeners to the window
const keyboard = new pc.Keyboard(window);

Parameters

element	Element, Window	Element to attach Keyboard to. Note that elements like <div> can't accept focus by default. To use keyboard events on an element like this it must have a value of 'tabindex' e.g. tabindex="0". See here for more details.
options	object	Optional options object.
options.preventDefault	boolean	Call preventDefault() in key event handlers. This stops the default action of the event occurring. e.g. Ctrl+T will not open a new browser tab.
options.stopPropagation	boolean	Call stopPropagation() in key event handlers. This stops the event bubbling up the DOM so no parent handlers will be notified of the event.

attach(element) 

Attach the keyboard event handlers to an Element.

Parameters

element

Element, Window

The element to listen for keyboard events on.

detach() 

Detach the keyboard event handlers from the element it is attached to.

isPressed(key) 

Return true if the key is currently down.

Parameters

key

number

The keyCode of the key to test. See the KEY_* constants.

Returns

boolean

True if the key was pressed, false if not.

wasPressed(key) 

Returns true if the key was pressed since the last update.

Parameters

key

number

The keyCode of the key to test. See the KEY_* constants.

Returns

boolean

True if the key was pressed.

wasReleased(key) 

Returns true if the key was released since the last update.

Parameters

key

number

The keyCode of the key to test. See the KEY_* constants.

Returns

boolean

True if the key was pressed.

keydown 

Fired when a key is pressed.

const onKeyDown = function (e) {
    if (e.key === pc.KEY_SPACE) {
        // space key pressed
    }
    e.event.preventDefault(); // Use original browser event to prevent browser action.
};
app.keyboard.on("keydown", onKeyDown, this);

Parameters

event

KeyboardEvent

The Keyboard event object. Note, this event is only valid for the current callback.

keyup 

Fired when a key is released.

const onKeyUp = function (e) {
    if (e.key === pc.KEY_SPACE) {
        // space key released
    }
    e.event.preventDefault(); // Use original browser event to prevent browser action.
};
app.keyboard.on("keyup", onKeyUp, this);

Parameters

event

KeyboardEvent

The Keyboard event object. Note, this event is only valid for the current callback.

fire(name, [arg1], [arg2], [arg3], [arg4], [arg5], [arg6], [arg7], [arg8]) 

Fire an event, all additional arguments are passed on to the event listener.

obj.fire('test', 'This is the message');

Parameters

name	string	Name of event to fire.
arg1	*	First argument that is passed to the event handler.
arg2	*	Second argument that is passed to the event handler.
arg3	*	Third argument that is passed to the event handler.
arg4	*	Fourth argument that is passed to the event handler.
arg5	*	Fifth argument that is passed to the event handler.
arg6	*	Sixth argument that is passed to the event handler.
arg7	*	Seventh argument that is passed to the event handler.
arg8	*	Eighth argument that is passed to the event handler.

Returns

EventHandler

Self for chaining.

hasEvent(name) 

Test if there are any handlers bound to an event name.

obj.on('test', function () { }); // bind an event to 'test'
obj.hasEvent('test'); // returns true
obj.hasEvent('hello'); // returns false

Parameters

name

string

The name of the event to test.

Returns

boolean

True if the object has handlers bound to the specified event name.

off([name], [callback], [scope]) 

Detach an event handler from an event. If callback is not provided then all callbacks are unbound from the event, if scope is not provided then all events with the callback will be unbound.

const handler = function () {
};
obj.on('test', handler);

obj.off(); // Removes all events
obj.off('test'); // Removes all events called 'test'
obj.off('test', handler); // Removes all handler functions, called 'test'
obj.off('test', handler, this); // Removes all handler functions, called 'test' with scope this

Parameters

name	string	Name of the event to unbind.
callback	HandleEventCallback	Function to be unbound.
scope	object	Scope that was used as the this when the event is fired.

Returns

EventHandler

Self for chaining.

on(name, callback, [scope]) 

Attach an event handler to an event.

obj.on('test', function (a, b) {
    console.log(a + b);
});
obj.fire('test', 1, 2); // prints 3 to the console

const evt = obj.on('test', function (a, b) {
    console.log(a + b);
});
// some time later
evt.off();

Parameters

name	string	Name of the event to bind the callback to.
callback	HandleEventCallback	Function that is called when event is fired. Note the callback is limited to 8 arguments.
scope	object	Object to use as 'this' when the event is fired, defaults to current this.

Returns

EventHandle

Can be used for removing event in the future.

once(name, callback, [scope]) 

Attach an event handler to an event. This handler will be removed after being fired once.

obj.once('test', function (a, b) {
    console.log(a + b);
});
obj.fire('test', 1, 2); // prints 3 to the console
obj.fire('test', 1, 2); // not going to get handled

Parameters

name	string	Name of the event to bind the callback to.
callback	HandleEventCallback	Function that is called when event is fired. Note the callback is limited to 8 arguments.
scope	object	Object to use as 'this' when the event is fired, defaults to current this.

Returns

EventHandle

• can be used for removing event in the future.