Engine API Reference - v2.7.1
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    Class ButtonComponent

    A ButtonComponent enables a group of entities to behave like a button, with different visual states for hover and press interactions.

    Hierarchy (View Summary)

    Index

    Properties

    entity system

    Accessors

    active enabled fadeDuration hitPadding hoverSpriteAsset hoverSpriteFrame hoverTint imageEntity inactiveSpriteAsset inactiveSpriteFrame inactiveTint pressedSpriteAsset pressedSpriteFrame pressedTint transitionMode

    Methods

    fire hasEvent off on once

    Events

    EVENT_CLICK EVENT_HOVEREND EVENT_HOVERSTART EVENT_MOUSEDOWN EVENT_MOUSEENTER EVENT_MOUSELEAVE EVENT_MOUSEUP EVENT_PRESSEDEND EVENT_PRESSEDSTART EVENT_SELECTEND EVENT_SELECTENTER EVENT_SELECTLEAVE EVENT_SELECTSTART EVENT_TOUCHCANCEL EVENT_TOUCHEND EVENT_TOUCHLEAVE EVENT_TOUCHSTART

    Properties

    entity: Entity

    The Entity that this Component is attached to.

    system: ComponentSystem

    The ComponentSystem used to create this Component.

    Accessors

    Methods

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

      Parameters

      • name: string

        Name of event to fire.

      • Optionalarg1: any

        First argument that is passed to the event handler.

      • Optionalarg2: any

        Second argument that is passed to the event handler.

      • Optionalarg3: any

        Third argument that is passed to the event handler.

      • Optionalarg4: any

        Fourth argument that is passed to the event handler.

      • Optionalarg5: any

        Fifth argument that is passed to the event handler.

      • Optionalarg6: any

        Sixth argument that is passed to the event handler.

      • Optionalarg7: any

        Seventh argument that is passed to the event handler.

      • Optionalarg8: any

        Eighth argument that is passed to the event handler.

      Returns EventHandler

      Self for chaining.

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

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

      Parameters

      • name: string

        The name of the event to test.

      Returns boolean

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

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

    • 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.

      Parameters

      • Optionalname: string

        Name of the event to unbind.

      • Optionalcallback: HandleEventCallback

        Function to be unbound.

      • Optionalscope: any

        Scope that was used as the this when the event is fired.

      Returns EventHandler

      Self for chaining.

      const handler = () => {};
      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

    • Attach an event handler to an event.

      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.

      • Optionalscope: any = ...

        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.

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

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

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

      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.

      • Optionalscope: any = ...

        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.
      obj.once('test', (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

    Events

    EVENT_CLICK: string = 'click'

    Fired when the mouse is pressed and released on the component or when a touch starts and ends on the component. The handler is passed a ElementMouseEvent or ElementTouchEvent.

    entity.button.on('click', (event) => {
        console.log(`Clicked entity ${entity.name}`);
    });
    EVENT_HOVEREND: string = 'hoverend'

    Fired when the button changes state to be not hovered.

    entity.button.on('hoverend', () => {
        console.log(`Entity ${entity.name} unhovered`);
    });
    EVENT_HOVERSTART: string = 'hoverstart'

    Fired when the button changes state to be hovered.

    entity.button.on('hoverstart', () => {
        console.log(`Entity ${entity.name} hovered`);
    });
    EVENT_MOUSEDOWN: string = 'mousedown'

    Fired when the mouse is pressed while the cursor is on the component. The handler is passed a ElementMouseEvent.

    entity.button.on('mousedown', (event) => {
        console.log(`Mouse down on entity ${entity.name}`);
    });
    EVENT_MOUSEENTER: string = 'mouseenter'

    Fired when the mouse cursor enters the component. The handler is passed a ElementMouseEvent.

    entity.button.on('mouseenter', (event) => {
        console.log(`Mouse entered entity ${entity.name}`);
    });
    EVENT_MOUSELEAVE: string = 'mouseleave'

    Fired when the mouse cursor leaves the component. The handler is passed a ElementMouseEvent.

    entity.button.on('mouseleave', (event) => {
        console.log(`Mouse left entity ${entity.name}`);
    });
    EVENT_MOUSEUP: string = 'mouseup'

    Fired when the mouse is released while the cursor is on the component. The handler is passed a ElementMouseEvent.

    entity.button.on('mouseup', (event) => {
        console.log(`Mouse up on entity ${entity.name}`);
    });
    EVENT_PRESSEDEND: string = 'pressedend'

    Fired when the button changes state to be not pressed.

    entity.button.on('pressedend', () => {
        console.log(`Entity ${entity.name} unpressed`);
    });
    EVENT_PRESSEDSTART: string = 'pressedstart'

    Fired when the button changes state to be pressed.

    entity.button.on('pressedstart', () => {
        console.log(`Entity ${entity.name} pressed`);
    });
    EVENT_SELECTEND: string = 'selectend'

    Fired when a xr select ends on the component. The handler is passed a ElementSelectEvent.

    entity.button.on('selectend', (event) => {
        console.log(`Select ended on entity ${entity.name}`);
    });
    EVENT_SELECTENTER: string = 'selectenter'

    Fired when a xr select now hovering over the component. The handler is passed a ElementSelectEvent.

    entity.button.on('selectenter', (event) => {
        console.log(`Select entered entity ${entity.name}`);
    });
    EVENT_SELECTLEAVE: string = 'selectleave'

    Fired when a xr select not hovering over the component. The handler is passed a ElementSelectEvent.

    entity.button.on('selectleave', (event) => {
        console.log(`Select left entity ${entity.name}`);
    });
    EVENT_SELECTSTART: string = 'selectstart'

    Fired when a xr select starts on the component. The handler is passed a ElementSelectEvent.

    entity.button.on('selectstart', (event) => {
        console.log(`Select started on entity ${entity.name}`);
    });
    EVENT_TOUCHCANCEL: string = 'touchcancel'

    Fired when a touch is canceled on the component. The handler is passed a ElementTouchEvent.

    entity.button.on('touchcancel', (event) => {
        console.log(`Touch canceled on entity ${entity.name}`);
    });
    EVENT_TOUCHEND: string = 'touchend'

    Fired when a touch ends on the component. The handler is passed a ElementTouchEvent.

    entity.button.on('touchend', (event) => {
        console.log(`Touch ended on entity ${entity.name}`);
    });
    EVENT_TOUCHLEAVE: string = 'touchleave'

    Fired when a touch leaves the component. The handler is passed a ElementTouchEvent.

    entity.button.on('touchleave', (event) => {
        console.log(`Touch left entity ${entity.name}`);
    });
    EVENT_TOUCHSTART: string = 'touchstart'

    Fired when a touch starts on the component. The handler is passed a ElementTouchEvent.

    entity.button.on('touchstart', (event) => {
        console.log(`Touch started on entity ${entity.name}`);
    });

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