#

API Documentation for: NEXT
Show: Inherited Protected Private Deprecated

# DisplayObject Class

Extends EventDispatcher
Defined in: `DisplayObject:129`
Module: EaselJS

DisplayObject is an abstract class that should not be constructed directly. Instead construct subclasses such as Container, Bitmap, and Shape. DisplayObject is the base class for all display classes in the EaselJS library. It defines the core properties and methods that are shared between all display objects, such as transformation properties (x, y, scaleX, scaleY, etc), caching, and mouse handlers.

## Constructor

### `DisplayObject`

()

Defined in `DisplayObject:129`

- Index
- Methods
- Properties
- Events

## Item Index

### Methods

- _applyShadow
- _cloneProps
- _dispatchEvent
- _getBounds
- _getStage
- _isMouseOpaque
- _testHit
- _tick
- _transformBounds
- _updateState
- addEventListener
- cache
- clone
- dispatchEvent
- draw
- getBounds
- getCacheDataURL
- getConcatenatedDisplayProps
- getConcatenatedMatrix
- getMatrix
- getTransformedBounds
- globalToLocal
- hasEventListener
- hitTest
- isVisible
- localToGlobal
- localToLocal
- off
- on
- removeAllEventListeners
- removeEventListener
- set
- setBounds
- setTransform
- toString
- uncache
- updateCache
- updateContext
- willTrigger

### Properties

- _bounds
- _cacheDataURL deprecated
- _cacheDataURLID deprecated
- _cacheScale deprecated
- _captureListeners
- _hitTestCanvas static
- _hitTestContext static
- _listeners
- _MOUSE_EVENTS static
- _props
- _rectangle
- _snapToPixelEnabled static
- _StageGL_BITMAP static
- _StageGL_NONE static
- _StageGL_SPRITE static
- _webGLRenderStyle
- alpha
- bitmapCache
- cacheCanvas
- cacheID deprecated
- compositeOperation
- cursor
- filters
- hitArea
- id
- mask
- mouseEnabled
- name
- parent
- regX
- regY
- rotation
- scaleX
- scaleX
- scaleY
- shadow
- skewX
- skewY
- snapToPixel
- stage
- suppressCrossDomainErrors static
- tickEnabled
- transformMatrix
- visible
- x
- y

### Events

- added
- click
- dblclick
- mousedown
- mouseout
- mouseover
- pressmove
- pressup
- removed
- rollout
- rollover
- tick

## Methods

### `_applyShadow`

(

- `ctx`
- `shadow`

)
protected

Defined in `_applyShadow:1261`

#### Parameters:

- `ctx` CanvasRenderingContext2D
- `shadow` Shadow

### `_cloneProps`

(

- `o`

)
DisplayObject protected

Defined in `_cloneProps:1228`

#### Parameters:

- `o` DisplayObject

  The DisplayObject instance which will have properties from the current DisplayObject instance copied into.

#### Returns:

DisplayObject:

o

### `_dispatchEvent`

(

- `eventObj`
- `eventPhase`

)
protected

Inherited from EventDispatcher: `_dispatchEvent:380`

#### Parameters:

- `eventObj` Object | Event
- `eventPhase` Object

### `_getBounds`

(

- `matrix`
- `ignoreTransform`

)
Rectangle protected

Defined in `_getBounds:1308`

#### Parameters:

- `matrix` Matrix2D
- `ignoreTransform` Boolean

  If true, does not apply this object's transform.

#### Returns:

Rectangle:

### `_getStage`

() Stage protected

Defined in `_getStage:672`

Use the stage property instead.

#### Returns:

Stage:

### `_isMouseOpaque`

() Boolean protected

Defined in `_isMouseOpaque:1352`

Indicates whether the display object has any mouse event listeners or a cursor.

#### Returns:

Boolean:

### `_testHit`

(

- `ctx`

)
Boolean protected

Defined in `_testHit:1291`

#### Parameters:

- `ctx` CanvasRenderingContext2D

#### Returns:

Boolean:

### `_tick`

(

- `evtObj`

)
protected

Defined in `_tick:1275`

#### Parameters:

- `evtObj` Object

  An event object that will be dispatched to all tick listeners. This object is reused between dispatchers to reduce construction & GC costs.

### `_transformBounds`

(

- `bounds`
- `matrix`
- `ignoreTransform`

)
Rectangle protected

Defined in `_transformBounds:1319`

#### Parameters:

- `bounds` Rectangle
- `matrix` Matrix2D
- `ignoreTransform` Boolean

#### Returns:

Rectangle:

### `_updateState`

()

Defined in `_updateState:1214`

Called before the object gets drawn and is a chance to ensure the display state of the object is correct. Mostly used by MovieClip and BitmapText to correct their internal state and children prior to being drawn.

Is manually called via draw in a Stage but is automatically called when present in a StageGL instance.

### `addEventListener`

(

- `type`
- `listener`
- `[useCapture]`

)
Function | Object

Inherited from EventDispatcher: `addEventListener:140`

Adds the specified event listener. Note that adding multiple listeners to the same function will result in multiple callbacks getting fired.

#### Example

     displayObject.addEventListener("click", handleClick);
     function handleClick(event) {
        // Click happened.
     }

#### Parameters:

- `type` String

  The string type of the event.

- `listener` Function | Object

  An object with a handleEvent method, or a function that will be called when the event is dispatched.

- `[useCapture]` Boolean optional

  For events that bubble, indicates whether to listen for the event in the capture or bubbling/target phase.

#### Returns:

Function | Object:

Returns the listener for chaining or assignment.

### `cache`

(

- `x`
- `y`
- `width`
- `height`
- `[scale=1]`
- `[options=undefined]`

)

Defined in `cache:792`

Draws the display object into a new element, which is then used for subsequent draws. Intended for complex content that does not change frequently (ex. a Container with many children that do not move, or a complex vector Shape), this can provide for much faster rendering because the content does not need to be re-rendered each tick. The cached display object can be moved, rotated, faded, etc freely, however if its content changes, you must manually update the cache by calling `updateCache()` again. You must specify the cached area via the x, y, w, and h parameters. This defines the rectangle that will be rendered and cached using this display object's coordinates.

#### Example

For example if you defined a Shape that drew a circle at 0, 0 with a radius of 25:

     var shape = new createjs.Shape();
     shape.graphics.beginFill("#ff0000").drawCircle(0, 0, 25);
     shape.cache(-25, -25, 50, 50);

Note that filters need to be defined before the cache is applied or you will have to call updateCache after application. Check out the Filter class for more information. Some filters (ex. BlurFilter) may not work as expected in conjunction with the scale param.

Usually, the resulting cacheCanvas will have the dimensions width scale, height scale, however some filters (ex. BlurFilter) will add padding to the canvas dimensions.

In previous versions caching was handled on DisplayObject but has since been moved to BitmapCache. This allows for easier interaction and alternate cache methods like WebGL with StageGL. For more information on the options object, see the BitmapCache BitmapCache/define.

#### Parameters:

- `x` Number

  The x coordinate origin for the cache region.

- `y` Number

  The y coordinate origin for the cache region.

- `width` Number

  The width of the cache region.

- `height` Number

  The height of the cache region.

- `[scale=1]` Number optional

  The scale at which the cache will be created. For example, if you cache a vector shape using myShape.cache(0,0,100,100,2) then the resulting cacheCanvas will be 200x200 px. This lets you scale and rotate cached elements with greater fidelity. Default is 1.

- `[options=undefined]` Object optional

  Specify additional parameters for the cache logic

### `clone`

() DisplayObject

Defined in `clone:1192`

Returns a clone of this DisplayObject. Some properties that are specific to this instance's current context are reverted to their defaults (for example .parent). Caches are not maintained across clones, and some elements are copied by reference (masks, individual filter instances, hit area)

#### Returns:

DisplayObject:

A clone of the current DisplayObject instance.

### `dispatchEvent`

(

- `eventObj`
- `[bubbles]`
- `[cancelable]`

)
Boolean

Inherited from EventDispatcher: `dispatchEvent:285`

Dispatches the specified event to all listeners.

#### Example

     // Use a string event
     this.dispatchEvent("complete");

     // Use an Event instance
     var event = new createjs.Event("progress");
     this.dispatchEvent(event);

#### Parameters:

- `eventObj` Object | String | Event

  An object with a "type" property, or a string type. While a generic object will work, it is recommended to use a CreateJS Event instance. If a string is used, dispatchEvent will construct an Event instance if necessary with the specified type. This latter approach can be used to avoid event object instantiation for non-bubbling events that may not have any listeners.

- `[bubbles]` Boolean optional

  Specifies the `bubbles` value when a string was passed to eventObj.

- `[cancelable]` Boolean optional

  Specifies the `cancelable` value when a string was passed to eventObj.

#### Returns:

Boolean:

Returns false if `preventDefault()` was called on a cancelable event, true otherwise.

### `draw`

(

- `ctx`
- `[ignoreCache=false]`

)
Boolean

Defined in `draw:741`

Draws the display object into the specified context ignoring its visible, alpha, shadow, and transform. Returns `true` if the draw was handled (useful for overriding functionality).

NOTE: This method is mainly for internal use, though it may be useful for advanced uses.

#### Parameters:

- `ctx` CanvasRenderingContext2D

  The canvas 2D context object to draw into.

- `[ignoreCache=false]` Boolean optional

  Indicates whether the draw operation should ignore any current cache. For example, used for drawing the cache (to prevent it from simply drawing an existing cache back into itself).

#### Returns:

Boolean:

### `getBounds`

() Rectangle

Defined in `getBounds:1089`

Returns a rectangle representing this object's bounds in its local coordinate system (ie. with no transformation). Objects that have been cached will return the bounds of the cache.

Not all display objects can calculate their own bounds (ex. Shape). For these objects, you can use setBounds so that they are included when calculating Container bounds.

All | All display objects support setting bounds manually using setBounds(). Likewise, display objects that have been cached using cache() will return the bounds of their cache. Manual and cache bounds will override the automatic calculations listed below.
Bitmap | Returns the width and height of the sourceRect (if specified) or image, extending from (x=0,y=0).
Sprite | Returns the bounds of the current frame. May have non-zero x/y if a frame registration point was specified in the spritesheet data. See also getFrameBounds
Container | Returns the aggregate (combined) bounds of all children that return a non-null value from getBounds().
Shape | Does not currently support automatic bounds calculations. Use setBounds() to manually define bounds.
Text | Returns approximate bounds. Horizontal values (x/width) are quite accurate, but vertical values (y/height) are not, especially when using textBaseline values other than "top".
BitmapText | Returns approximate bounds. Values will be more accurate if spritesheet frame registration points are close to (x=0,y=0).

Bounds can be expensive to calculate for some objects (ex. text, or containers with many children), and are recalculated each time you call getBounds(). You can prevent recalculation on static objects by setting the bounds explicitly:

    var bounds = obj.getBounds();
    obj.setBounds(bounds.x, bounds.y, bounds.width, bounds.height);
    // getBounds will now use the set values, instead of recalculating

To reduce memory impact, the returned Rectangle instance may be reused internally; clone the instance or copy its values if you need to retain it.

    var myBounds = obj.getBounds().clone();
    // OR:
    myRect.copy(obj.getBounds());

#### Returns:

Rectangle:

A Rectangle instance representing the bounds, or null if bounds are not available for this object.

### `getCacheDataURL`

() String

Defined in `getCacheDataURL:875`

Returns a data URL for the cache, or null if this display object is not cached. Only generated if the cache has changed, otherwise returns last result.

#### Returns:

String:

The image data url for the cache.

### `getConcatenatedDisplayProps`

(

- `[props]`

)
DisplayProps

Defined in `getConcatenatedDisplayProps:1021`

Generates a DisplayProps object representing the combined display properties of the object and all of its parent Containers up to the highest level ancestor (usually the Stage).

#### Parameters:

- `[props]` DisplayProps optional

  A DisplayProps object to populate with the calculated values. If null, a new DisplayProps object is returned.

#### Returns:

DisplayProps:

The combined display properties.

### `getConcatenatedMatrix`

(

- `[matrix]`

)
Matrix2D

Defined in `getConcatenatedMatrix:1003`

Generates a Matrix2D object representing the combined transform of the display object and all of its parent Containers up to the highest level ancestor (usually the Stage). This can be used to transform positions between coordinate spaces, such as with localToGlobal and globalToLocal.

#### Parameters:

- `[matrix]` Matrix2D optional

  A Matrix2D object to populate with the calculated values. If null, a new Matrix2D object is returned.

#### Returns:

Matrix2D:

The combined matrix.

### `getMatrix`

(

- `matrix`

)
Matrix2D

Defined in `getMatrix:991`

Returns a matrix based on this object's current transform.

#### Parameters:

- `matrix` Matrix2D

  Optional. A Matrix2D object to populate with the calculated values. If null, a new Matrix object is returned.

#### Returns:

Matrix2D:

A matrix representing this display object's transform.

### `getTransformedBounds`

() Rectangle

Defined in `getTransformedBounds:1155`

Returns a rectangle representing this object's bounds in its parent's coordinate system (ie. with transformations applied). Objects that have been cached will return the transformed bounds of the cache.

Not all display objects can calculate their own bounds (ex. Shape). For these objects, you can use setBounds so that they are included when calculating Container bounds.

To reduce memory impact, the returned Rectangle instance may be reused internally; clone the instance or copy its values if you need to retain it.

Container instances calculate aggregate bounds for all children that return bounds via getBounds.

#### Returns:

Rectangle:

A Rectangle instance representing the bounds, or null if bounds are not available for this object.

### `globalToLocal`

(

- `x`
- `y`
- `[pt]`

)
Point

Defined in `globalToLocal:910`

Transforms the specified x and y position from the global (stage) coordinate space to the coordinate space of the display object. For example, this could be used to determine the current mouse position within the display object. Returns a Point instance with x and y properties correlating to the transformed position in the display object's coordinate space.

#### Example

     displayObject.x = 300;
     displayObject.y = 200;
     stage.addChild(displayObject);
     var point = displayObject.globalToLocal(100, 100);
     // Results in x=-200, y=-100

#### Parameters:

- `x` Number

  The x position on the stage to transform.

- `y` Number

  The y position on the stage to transform.

- `[pt]` Point | Object optional

  An object to copy the result into. If omitted a new Point object with x/y properties will be returned.

#### Returns:

Point:

A Point instance with x and y properties correlating to the transformed position in the display object's coordinate space.

### `hasEventListener`

(

- `type`

)
Boolean

Inherited from EventDispatcher: `hasEventListener:339`

Indicates whether there is at least one listener for the specified event type.

#### Parameters:

- `type` String

  The string type of the event.

#### Returns:

Boolean:

Returns true if there is at least one listener for the specified event.

### `hitTest`

(

- `x`
- `y`

)
Boolean

Defined in `hitTest:1042`

Tests whether the display object intersects the specified point in local coordinates (ie. draws a pixel with alpha > 0 at the specified position). This ignores the alpha, shadow, hitArea, mask, and compositeOperation of the display object.

#### Example

     stage.addEventListener("stagemousedown", handleMouseDown);
     function handleMouseDown(event) {
         var hit = myShape.hitTest(event.stageX, event.stageY);
     }

Please note that shape-to-shape collision is not currently supported by EaselJS.

#### Parameters:

- `x` Number

  The x position to check in the display object's local coordinates.

- `y` Number

  The y position to check in the display object's local coordinates.

#### Returns:

Boolean:

A Boolean indicating whether a visible portion of the DisplayObject intersect the specified local Point.

### `isVisible`

() Boolean

Defined in `isVisible:729`

Returns true or false indicating whether the display object would be visible if drawn to a canvas. This does not account for whether it would be visible within the boundaries of the stage.

NOTE: This method is mainly for internal use, though it may be useful for advanced uses.

#### Returns:

Boolean:

Boolean indicating whether the display object would be visible if drawn to a canvas

### `localToGlobal`

(

- `x`
- `y`
- `[pt]`

)
Point

Defined in `localToGlobal:885`

Transforms the specified x and y position from the coordinate space of the display object to the global (stage) coordinate space. For example, this could be used to position an HTML label over a specific point on a nested display object. Returns a Point instance with x and y properties correlating to the transformed coordinates on the stage.

#### Example

     displayObject.x = 300;
     displayObject.y = 200;
     stage.addChild(displayObject);
     var point = displayObject.localToGlobal(100, 100);
     // Results in x=400, y=300

#### Parameters:

- `x` Number

  The x position in the source display object to transform.

- `y` Number

  The y position in the source display object to transform.

- `[pt]` Point | Object optional

  An object to copy the result into. If omitted a new Point object with x/y properties will be returned.

#### Returns:

Point:

A Point instance with x and y properties correlating to the transformed coordinates on the stage.

### `localToLocal`

(

- `x`
- `y`
- `target`
- `[pt]`

)
Point

Defined in `localToLocal:935`

Transforms the specified x and y position from the coordinate space of this display object to the coordinate space of the target display object. Returns a Point instance with x and y properties correlating to the transformed position in the target's coordinate space. Effectively the same as using the following code with localToGlobal and globalToLocal.

     var pt = this.localToGlobal(x, y);
     pt = target.globalToLocal(pt.x, pt.y);

#### Parameters:

- `x` Number

  The x position in the source display object to transform.

- `y` Number

  The y position on the source display object to transform.

- `target` DisplayObject

  The target display object to which the coordinates will be transformed.

- `[pt]` Point | Object optional

  An object to copy the result into. If omitted a new Point object with x/y properties will be returned.

#### Returns:

Point:

Returns a Point instance with x and y properties correlating to the transformed position in the target's coordinate space.

### `off`

(

- `type`
- `listener`
- `[useCapture]`

)

Inherited from EventDispatcher: `off:249`

A shortcut to the removeEventListener method, with the same parameters and return value. This is a companion to the .on method.

IMPORTANT: To remove a listener added with `on`, you must pass in the returned wrapper function as the listener. See on for an example.

#### Parameters:

- `type` String

  The string type of the event.

- `listener` Function | Object

  The listener function or object.

- `[useCapture]` Boolean optional

  For events that bubble, indicates whether to listen for the event in the capture or bubbling/target phase.

### `on`

(

- `type`
- `listener`
- `[scope]`
- `[once=false]`
- `[data]`
- `[useCapture=false]`

)
Function

Inherited from EventDispatcher: `on:173`

A shortcut method for using addEventListener that makes it easier to specify an execution scope, have a listener only run once, associate arbitrary data with the listener, and remove the listener.

This method works by creating an anonymous wrapper function and subscribing it with addEventListener. The wrapper function is returned for use with `removeEventListener` (or `off`).

IMPORTANT: To remove a listener added with `on`, you must pass in the returned wrapper function as the listener, or use remove. Likewise, each time you call `on` a NEW wrapper function is subscribed, so multiple calls to `on` with the same params will create multiple listeners.

#### Example

        var listener = myBtn.on("click", handleClick, null, false, {count:3});
        function handleClick(evt, data) {
            data.count -= 1;
            console.log(this == myBtn); // true - scope defaults to the dispatcher
            if (data.count == 0) {
                alert("clicked 3 times!");
                myBtn.off("click", listener);
                // alternately: evt.remove();
            }
        }

#### Parameters:

- `type` String

  The string type of the event.

- `listener` Function | Object

  An object with a handleEvent method, or a function that will be called when the event is dispatched.

- `[scope]` Object optional

  The scope to execute the listener in. Defaults to the dispatcher/currentTarget for function listeners, and to the listener itself for object listeners (ie. using handleEvent).

- `[once=false]` Boolean optional

  If true, the listener will remove itself after the first time it is triggered.

- `[data]` optional

  Arbitrary data that will be included as the second parameter when the listener is called.

- `[useCapture=false]` Boolean optional

  For events that bubble, indicates whether to listen for the event in the capture or bubbling/target phase.

#### Returns:

Function:

Returns the anonymous function that was created and assigned as the listener. This is needed to remove the listener later using .removeEventListener.

### `removeAllEventListeners`

(

- `[type]`

)

Inherited from EventDispatcher: `removeAllEventListeners:263`

Removes all listeners for the specified type, or all listeners of all types.

#### Example

     // Remove all listeners
     displayObject.removeAllEventListeners();

     // Remove all click listeners
     displayObject.removeAllEventListeners("click");

#### Parameters:

- `[type]` String optional

  The string type of the event. If omitted, all listeners for all types will be removed.

### `removeEventListener`

(

- `type`
- `listener`
- `[useCapture]`

)

Inherited from EventDispatcher: `removeEventListener:219`

Removes the specified event listener.

Important Note: that you must pass the exact function reference used when the event was added. If a proxy function, or function closure is used as the callback, the proxy/closure reference must be used - a new proxy or closure will not work.

#### Example

     displayObject.removeEventListener("click", handleClick);

#### Parameters:

- `type` String

  The string type of the event.

- `listener` Function | Object

  The listener function or object.

- `[useCapture]` Boolean optional

  For events that bubble, indicates whether to listen for the event in the capture or bubbling/target phase.

### `set`

(

- `props`

)
DisplayObject chainable

Defined in `set:1071`

Provides a chainable shortcut method for setting a number of properties on the instance.

#### Example

     var myGraphics = new createjs.Graphics().beginFill("#ff0000").drawCircle(0, 0, 25);
     var shape = stage.addChild(new Shape()).set({graphics:myGraphics, x:100, y:100, alpha:0.5});

#### Parameters:

- `props` Object

  A generic object containing properties to copy to the DisplayObject instance.

#### Returns:

DisplayObject:

Returns the instance the method is called on (useful for chaining calls.)

### `setBounds`

(

- `x`
- `y`
- `width`
- `height`

)

Defined in `setBounds:1174`

Allows you to manually specify the bounds of an object that either cannot calculate their own bounds (ex. Shape & Text) for future reference, or so the object can be included in Container bounds. Manually set bounds will always override calculated bounds.

The bounds should be specified in the object's local (untransformed) coordinates. For example, a Shape instance with a 25px radius circle centered at 0,0 would have bounds of (-25, -25, 50, 50).

#### Parameters:

- `x` Number

  The x origin of the bounds. Pass null to remove the manual bounds.

- `y` Number

  The y origin of the bounds.

- `width` Number

  The width of the bounds.

- `height` Number

  The height of the bounds.

### `setTransform`

(

- `[x=0]`
- `[y=0]`
- `[scaleX=1]`
- `[scaleY=1]`
- `[rotation=0]`
- `[skewX=0]`
- `[skewY=0]`
- `[regX=0]`
- `[regY=0]`

)
DisplayObject chainable

Defined in `setTransform:957`

Shortcut method to quickly set the transform properties on the display object. All parameters are optional. Omitted parameters will have the default value set.

#### Example

     displayObject.setTransform(100, 100, 2, 2);

#### Parameters:

- `[x=0]` Number optional

  The horizontal translation (x position) in pixels

- `[y=0]` Number optional

  The vertical translation (y position) in pixels

- `[scaleX=1]` Number optional

  The horizontal scale, as a percentage of 1

- `[scaleY=1]` Number optional

  the vertical scale, as a percentage of 1

- `[rotation=0]` Number optional

  The rotation, in degrees

- `[skewX=0]` Number optional

  The horizontal skew factor

- `[skewY=0]` Number optional

  The vertical skew factor

- `[regX=0]` Number optional

  The horizontal registration point in pixels

- `[regY=0]` Number optional

  The vertical registration point in pixels

#### Returns:

DisplayObject:

Returns this instance. Useful for chaining commands.

### `toString`

() String

Inherited from EventDispatcher but overwritten in `toString:1203`

Returns a string representation of this object.

#### Returns:

String:

a string representation of the instance.

### `uncache`

()

Defined in `uncache:864`

Clears the current cache. See cache for more information.

### `updateCache`

(

- `compositeOperation`

)

Defined in `updateCache:835`

Redraws the display object to its cache. Calling updateCache without an active cache will throw an error. If compositeOperation is null the current cache will be cleared prior to drawing. Otherwise the display object will be drawn over the existing cache using the specified compositeOperation.

#### Example

Clear the current graphics of a cached shape, draw some new instructions, and then update the cache. The new line will be drawn on top of the old one.

     // Not shown: Creating the shape, and caching it.
     shapeInstance.clear();
     shapeInstance.setStrokeStyle(3).beginStroke("#ff0000").moveTo(100, 100).lineTo(200,200);
     shapeInstance.updateCache();

In previous versions caching was handled on DisplayObject but has since been moved to BitmapCache. This allows for easier interaction and alternate cache methods like WebGL and StageGL.

#### Parameters:

- `compositeOperation` String

  The compositeOperation to use, or null to clear the cache and redraw it. whatwg spec on compositing.

### `updateContext`

(

- `ctx`

)

Defined in `updateContext:760`

Applies this display object's transformation, alpha, globalCompositeOperation, clipping path (mask), and shadow to the specified context. This is typically called prior to draw.

#### Parameters:

- `ctx` CanvasRenderingContext2D

  The canvas 2D to update.

### `willTrigger`

(

- `type`

)
Boolean

Inherited from EventDispatcher: `willTrigger:350`

Indicates whether there is at least one listener for the specified event type on this object or any of its ancestors (parent, parent's parent, etc). A return value of true indicates that if a bubbling event of the specified type is dispatched from this object, it will trigger at least one listener.

This is similar to hasEventListener, but it searches the entire event flow for a listener, not just this object.

#### Parameters:

- `type` String

  The string type of the event.

#### Returns:

Boolean:

Returns `true` if there is at least one listener for the specified event.

## Properties

### `_bounds`

Rectangle protected

Defined in `_bounds:443`

Default: null

### `_cacheDataURL`

String deprecated protected

Defined in `_cacheDataURL:418`

Moved to BitmapCache

Default: null

### `_cacheDataURLID`

Number deprecated protected

Defined in `_cacheDataURLID:409`

Moved to BitmapCache

Default: 0

### `_cacheScale`

Number deprecated protected

Defined in `_cacheScale:400`

Moved to BitmapCache

Default: 1

### `_captureListeners`

Object protected

Inherited from EventDispatcher: `_captureListeners:106`

### `_hitTestCanvas`

HTMLCanvasElement | Object protected static

Defined in `_hitTestCanvas:519`

### `_hitTestContext`

CanvasRenderingContext2D protected static

Defined in `_hitTestContext:525`

### `_listeners`

Object protected

Inherited from EventDispatcher: `_listeners:99`

### `_MOUSE_EVENTS`

Array protected static

Defined in `_MOUSE_EVENTS:464`

Listing of mouse event names. Used in _hasMouseEventListener.

### `_props`

DisplayObject protected

Defined in `_props:427`

Default: null

### `_rectangle`

Rectangle protected

Defined in `_rectangle:435`

Default: null

### `_snapToPixelEnabled`

Boolean protected static

Defined in `_snapToPixelEnabled:483`

Default: false

### `_StageGL_BITMAP`

Number protected static

Defined in `_StageGL_BITMAP:510`

Enum like property for determining StageGL render lookup, i.e. where to expect properties.

### `_StageGL_NONE`

Number protected static

Defined in `_StageGL_NONE:492`

Enum like property for determining StageGL render lookup, i.e. where to expect properties.

### `_StageGL_SPRITE`

Number protected static

Defined in `_StageGL_SPRITE:501`

Enum like property for determining StageGL render lookup, i.e. where to expect properties.

### `_webGLRenderStyle`

Number protected

Defined in `_webGLRenderStyle:451`

Where StageGL should look for required display properties, matters only for leaf display objects. Containers or cached objects won't use this property, it's for native display of terminal elements.

Default: 0

### `alpha`

Number

Defined in `alpha:144`

The alpha (transparency) for this display object. 0 is fully transparent, 1 is fully opaque.

Default: 1

### `bitmapCache`

BitmapCache readonly

Defined in `bitmapCache:162`

If a cache has been made, this returns the class that is managing the cacheCanvas and its properties. See BitmapCache for more information. Use this to control, inspect, and change the cache. In special circumstances this may be a modified or subclassed BitmapCache.

Default: null

### `cacheCanvas`

HTMLCanvasElement | Object readonly

Defined in `cacheCanvas:152`

If a cache is active, this returns the canvas that holds the image of this display object. See cache for more information. Use this to display the result of a cache. This will be a HTMLCanvasElement unless special cache rules have been deliberately enabled for this cache.

Default: null

### `cacheID`

Number deprecated

Defined in `cacheID:695`

Returns an ID number that uniquely identifies the current cache for this display object. This can be used to determine if the cache has changed since a previous check. Moved to BitmapCache

Default: 0

### `compositeOperation`

String

Defined in `compositeOperation:330`

The composite operation indicates how the pixels of this display object will be composited with the elements behind it. If `null`, this property is inherited from the parent container. For more information, read the whatwg spec on compositing. For a list of supported compositeOperation value, visit the W3C draft on Compositing and Blending.

Default: null

### `cursor`

String

Defined in `cursor:388`

A CSS cursor (ex. "pointer", "help", "text", etc) that will be displayed when the user hovers over this display object. You must enable mouseover events using the enableMouseOver method to use this property. Setting a non-null cursor on a Container will override the cursor set on its descendants.

Default: null

### `filters`

Array

Defined in `filters:352`

An array of Filter objects to apply to this display object. Filters are only applied / updated when Cache or UpdateCache is called on the display object, and only apply to the area that is cached.

Default: null

### `hitArea`

DisplayObject

Defined in `hitArea:371`

A display object that will be tested when checking mouse interactions or testing getObjectsUnderPoint. The hit area will have its transformation applied relative to this display object's coordinate space (as though the hit test object were a child of this display object and relative to its regX/Y). The hitArea will be tested using only its own `alpha` value regardless of the alpha value on the target display object, or the target's ancestors (parents).

If set on a Container, children of the Container will not receive mouse events. This is similar to setting MouseChildren to false.

Note that hitArea is NOT currently used by the `hitTest()` method, nor is it supported for Stage.

Default: null

### `id`

Number

Defined in `id:172`

Unique ID for this display object. Makes display objects easier for some uses.

Default: -1

### `mask`

Shape

Defined in `mask:362`

A Shape instance that defines a vector mask (clipping path) for this display object. The shape's transformation will be applied relative to the display object's parent coordinates (as if it were a child of the parent).

Default: null

### `mouseEnabled`

Boolean

Defined in `mouseEnabled:180`

Indicates whether to include this object when running mouse interactions. Setting this to `false` for children of a Container will cause events on the Container to not fire when that child is clicked. Setting this property to `false` does not prevent the getObjectsUnderPoint method from returning the child.

Note: In EaselJS 0.7.0, the mouseEnabled property will not work properly with nested Containers. Please check out the latest NEXT version in GitHub for an updated version with this issue resolved. The fix will be provided in the next release of EaselJS.

Default: true

### `name`

String

Defined in `name:205`

An optional name for this display object. Included in toString . Useful for debugging.

Default: null

### `parent`

Container final readonly

Defined in `parent:214`

A reference to the Container or Stage object that contains this display object, or null if it has not been added to one.

Default: null

### `regX`

Number

Defined in `regX:226`

The left offset for this display object's registration point. For example, to make a 100x100px Bitmap rotate around its center, you would set regX and regY to 50. Cached object's registration points should be set based on pre-cache conditions, not cached size.

Default: 0

### `regY`

Number

Defined in `regY:236`

The y offset for this display object's registration point. For example, to make a 100x100px Bitmap rotate around its center, you would set regX and regY to 50. Cached object's registration points should be set based on pre-cache conditions, not cached size.

Default: 0

### `rotation`

Number

Defined in `rotation:246`

The rotation in degrees for this display object.

Default: 0

### `scaleX`

Number

Defined in `scaleX:254`

The factor to stretch this display object horizontally. For example, setting scaleX to 2 will stretch the display object to twice its nominal width. To horizontally flip an object, set the scale to a negative number.

Default: 1

### `scaleX`

Number

Defined in `scaleX:705`

Set both the scaleX and the DisplayObject/scaleY property to the same value. Note that when you get the value, if the `scaleX` and `scaleY` are different values, it will return only the `scaleX`.

Default: 1

### `scaleY`

Number

Defined in `scaleY:263`

The factor to stretch this display object vertically. For example, setting scaleY to 0.5 will stretch the display object to half its nominal height. To vertically flip an object, set the scale to a negative number.

Default: 1

### `shadow`

Shadow

Defined in `shadow:288`

A shadow object that defines the shadow to render on this display object. Set to `null` to remove a shadow. If null, this property is inherited from the parent container.

Default: null

### `skewX`

Number

Defined in `skewX:272`

The factor to skew this display object horizontally.

Default: 0

### `skewY`

Number

Defined in `skewY:280`

The factor to skew this display object vertically.

Default: 0

### `snapToPixel`

Boolean

Defined in `snapToPixel:342`

Indicates whether the display object should be drawn to a whole pixel when Stage/snapToPixelEnabled is true. To enable/disable snapping on whole categories of display objects, set this value on the prototype (Ex. Text.prototype.snapToPixel = true).

Default: true

### `stage`

Stage readonly

Defined in `stage:688`

Returns the Stage instance that this display object will be rendered on, or null if it has not been added to one.

### `suppressCrossDomainErrors`

Boolean static

Defined in `suppressCrossDomainErrors:473`

Suppresses errors generated when using features like hitTest, mouse events, and GetObjectsUnderPoint with cross domain content.

Default: false

### `tickEnabled`

Boolean

Defined in `tickEnabled:195`

If false, the tick will not run on this display object (or its children). This can provide some performance benefits. In addition to preventing the "tick" event from being dispatched, it will also prevent tick related updates on some display objects (ex. Sprite & MovieClip frame advancing, and DOMElement display properties).

Default: true

### `transformMatrix`

Matrix2D

Defined in `transformMatrix:321`

If set, defines the transformation for this display object, overriding all other transformation properties (x, y, rotation, scale, skew).

Default: null

### `visible`

Boolean

Defined in `visible:297`

Indicates whether this display object should be rendered to the canvas and included when running the Stage Stage/getObjectsUnderPoint method.

Default: true

### `x`

Number

Defined in `x:306`

The x (horizontal) position of the display object, relative to its parent.

Default: 0

### `y`

Number

Defined in `y:314`

Default: 0

## Events

### `added`

Defined in `added:646`

Dispatched when the display object is added to a parent container.

### `click`

Defined in `click:546`

Available since 0.6.0

Dispatched when the user presses their left mouse button and then releases it while over the display object. See the MouseEvent class for a listing of event properties.

### `dblclick`

Defined in `dblclick:553`

Available since 0.6.0

Dispatched when the user double clicks their left mouse button over this display object. See the MouseEvent class for a listing of event properties.

### `mousedown`

Defined in `mousedown:539`

Available since 0.6.0

Dispatched when the user presses their left mouse button over the display object. See the MouseEvent class for a listing of event properties.

### `mouseout`

Defined in `mouseout:568`

Available since 0.6.0

Dispatched when the user's mouse leaves this display object. This event must be enabled using enableMouseOver. See also rollout. See the MouseEvent class for a listing of event properties.

### `mouseover`

Defined in `mouseover:560`

Available since 0.6.0

Dispatched when the user's mouse enters this display object. This event must be enabled using enableMouseOver. See also rollover. See the MouseEvent class for a listing of event properties.

### `pressmove`

Defined in `pressmove:616`

Available since 0.7.0

After a mousedown occurs on a display object, a pressmove event will be generated on that object whenever the mouse moves until the mouse press is released. This can be useful for dragging and similar operations.

Please note that if the initial mouse target from a `mousedown` event is removed from the stage after being pressed (e.g. during a `pressmove` event), a `pressmove` event is still generated. However since it is no longer in the display list, the event can not bubble. This means that previous ancestors (parent containers) will not receive the event, and therefore can not re-dispatch it. If you intend to listen for `pressup` or `pressmove` on a dynamic object (such as a MovieClip or Container), then ensure you set mouseChildren to `false`.

### `pressup`

Defined in `pressup:631`

Available since 0.7.0

After a mousedown occurs on a display object, a pressup event will be generated on that object when that mouse press is released. This can be useful for dragging and similar operations.

Please note that if the initial mouse target from a `mousedown` event is removed from the stage after being pressed (e.g. during a `pressmove` event), a `pressup` event is still generated. However since it is no longer in the display list, the event can not bubble. This means that previous ancestors (parent containers) will not receive the event, and therefore can not re-dispatch it. If you intend to listen for `pressmove` or `pressup` on a dynamic object (such as a MovieClip or Container), then ensure you set mouseChildren to `false`.

### `removed`

Defined in `removed:651`

Dispatched when the display object is removed from its parent container.

### `rollout`

Defined in `rollout:596`

Available since 0.7.0

This event is similar to mouseout, with the following differences: it does not bubble, and it considers Container instances as an aggregate of their content.

For example, myContainer contains two overlapping children: shapeA and shapeB. The user moves their mouse over shapeA, then directly on to shapeB, then off both. With a listener for Mouseout:event on myContainer, two events would be received, each targeting a child element:

1. when the mouse leaves shapeA (target=shapeA)

2. when the mouse leaves shapeB (target=shapeB)

However, with a listener for "rollout" instead, only a single event is received when the mouse leaves the aggregate myContainer content (target=myContainer).

This event must be enabled using enableMouseOver. See the MouseEvent class for a listing of event properties.

### `rollover`

Defined in `rollover:576`

Available since 0.7.0

This event is similar to mouseover, with the following differences: it does not bubble, and it considers Container instances as an aggregate of their content.

For example, myContainer contains two overlapping children: shapeA and shapeB. The user moves their mouse over shapeA and then directly on to shapeB. With a listener for Mouseover:event on myContainer, two events would be received, each targeting a child element:

1. when the mouse enters shapeA (target=shapeA)

2. when the mouse enters shapeB (target=shapeB)

However, with a listener for "rollover" instead, only a single event is received when the mouse first enters the aggregate myContainer content (target=myContainer).

This event must be enabled using enableMouseOver. See the MouseEvent class for a listing of event properties.

### `tick`

Defined in `tick:656`

Available since 0.6.0

Dispatched on each display object on a stage whenever the stage updates. This occurs immediately before the rendering (draw) pass. When update is called, first all display objects on the stage dispatch the tick event, then all of the display objects are drawn to stage. Children will have their Tick:event event dispatched in order of their depth prior to the event being dispatched on their parent.

#### Event Payload:

- `target` Object

  The object that dispatched the event.

- `type` String

  The event type.

- `params` Array

  An array containing any arguments that were passed to the Stage.update() method. For example if you called stage.update("hello"), then the params would be ["hello"].