Packagefeathers.controls
Classpublic class SimpleScrollBar
InheritanceSimpleScrollBar Inheritance FeathersControl Inheritance starling.display.Sprite
Implements IDirectionalScrollBar

Select a value between a minimum and a maximum by dragging a thumb over a physical range. This type of scroll bar does not have a visible track, and it does not have increment and decrement buttons. It is ideal for mobile applications where the scroll bar is often simply a visual element to indicate the scroll position. For a more feature-rich scroll bar, see the ScrollBar component.

The following example updates a list to use simple scroll bars:

     list.horizontalScrollBarFactory = function():IScrollBar
     {
         var scrollBar:SimpleScrollBar = new SimpleScrollBar();
         scrollBar.direction = SimpleScrollBar.DIRECTION_HORIZONTAL;
         return scrollBar;
     };
     list.verticalScrollBarFactory = function():IScrollBar
     {
         var scrollBar:SimpleScrollBar = new SimpleScrollBar();
         scrollBar.direction = SimpleScrollBar.DIRECTION_VERTICAL;
         return scrollBar;
     };

See also

How to use the Feathers SimpleScrollBar component
feathers.controls.ScrollBar


Public Properties
 PropertyDefined By
  clampToRange : Boolean = false
Determines if the value should be clamped to the range between the minimum and maximum.
SimpleScrollBar
  customThumbName : String
DEPRECATED: Replaced by customThumbStyleName.
SimpleScrollBar
  customThumbStyleName : String
A style name to add to the scroll bar's thumb sub-component.
SimpleScrollBar
 InheriteddefaultTextEditorFactory : Function
[static] A function used by all UI controls that support text editor to create an ITextEditor instance.
FeathersControl
 InheriteddefaultTextRendererFactory : Function
[static] A function used by all UI controls that support text renderers to create an ITextRenderer instance.
FeathersControl
 Inheriteddepth : int
[read-only] The component's depth in the display list, relative to the stage.
FeathersControl
  direction : String
Determines if the scroll bar's thumb can be dragged horizontally or vertically.
SimpleScrollBar
 InheritedfocusIndicatorSkin : DisplayObject
If this component supports focus, this optional skin will be displayed above the component when showFocus() is called.
FeathersControl
 InheritedfocusManager : IFocusManager
FeathersControl
 InheritedfocusOwner : IFocusDisplayObject
FeathersControl
 InheritedfocusPadding : Number
Quickly sets all focus padding properties to the same value.
FeathersControl
 InheritedfocusPaddingBottom : Number
The minimum space, in pixels, between the object's bottom edge and the bottom edge of the focus indicator skin.
FeathersControl
 InheritedfocusPaddingLeft : Number
The minimum space, in pixels, between the object's left edge and the left edge of the focus indicator skin.
FeathersControl
 InheritedfocusPaddingRight : Number
The minimum space, in pixels, between the object's right edge and the right edge of the focus indicator skin.
FeathersControl
 InheritedfocusPaddingTop : Number
The minimum space, in pixels, between the object's top edge and the top edge of the focus indicator skin.
FeathersControl
  globalStyleProvider : IStyleProvider
[static] The default IStyleProvider for all SimpleScrollBar components.
SimpleScrollBar
 Inheritedheight : Number
[override] The height of the component, in pixels.
FeathersControl
 InheritedincludeInLayout : Boolean
Determines if the ILayout should use this object or ignore it.
FeathersControl
 InheritedisCreated : Boolean
[read-only] Determines if the component has been initialized and validated for the first time.
FeathersControl
 InheritedisEnabled : Boolean
Indicates whether the control is interactive or not.
FeathersControl
 InheritedisFocusEnabled : Boolean
FeathersControl
 InheritedisInitialized : Boolean
[read-only] Determines if the component has been initialized yet.
FeathersControl
 InheritedisQuickHitAreaEnabled : Boolean
Similar to mouseChildren on the classic display list.
FeathersControl
 InheritedlayoutData : ILayoutData
Extra parameters associated with this display object that will be used by the layout algorithm.
FeathersControl
  liveDragging : Boolean = true
Determines if the scroll bar dispatches the Event.CHANGE event every time the thumb moves, or only once it stops moving.
SimpleScrollBar
 InheritedmaxHeight : Number
The maximum recommended height to be used for self-measurement and, optionally, by any code that is resizing this component.
FeathersControl
  maximum : Number
The maximum numeric value of the range.
SimpleScrollBar
 InheritedmaxWidth : Number
The maximum recommended width to be used for self-measurement and, optionally, by any code that is resizing this component.
FeathersControl
 InheritedminHeight : Number
The minimum recommended height to be used for self-measurement and, optionally, by any code that is resizing this component.
FeathersControl
  minimum : Number
The minimum numeric value of the range.
SimpleScrollBar
 InheritedminTouchHeight : Number
If using isQuickHitAreaEnabled, and the hit area's height is smaller than this value, it will be expanded.
FeathersControl
 InheritedminTouchWidth : Number
If using isQuickHitAreaEnabled, and the hit area's width is smaller than this value, it will be expanded.
FeathersControl
 InheritedminWidth : Number
The minimum recommended width to be used for self-measurement and, optionally, by any code that is resizing this component.
FeathersControl
 InheritednextTabFocus : IFocusDisplayObject
FeathersControl
  padding : Number
Quickly sets all padding properties to the same value.
SimpleScrollBar
  paddingBottom : Number
The minimum space, in pixels, below the thumb.
SimpleScrollBar
  paddingLeft : Number
The minimum space, in pixels, to the left of the thumb.
SimpleScrollBar
  paddingRight : Number
The minimum space, in pixels, to the right of the thumb.
SimpleScrollBar
  paddingTop : Number
The minimum space, in pixels, above the thumb.
SimpleScrollBar
  page : Number
The amount the scroll bar value must change to get from one "page" to the next.
SimpleScrollBar
 InheritedpreviousTabFocus : IFocusDisplayObject
FeathersControl
  repeatDelay : Number
The time, in seconds, before actions are repeated.
SimpleScrollBar
  step : Number
The amount the value must change to increment or decrement.
SimpleScrollBar
 InheritedstyleName : String
The concatenated styleNameList, with values separated by spaces.
FeathersControl
 InheritedstyleNameList : TokenList
[read-only] Contains a list of all "styles" assigned to this control.
FeathersControl
 InheritedstyleProvider : IStyleProvider
When a component initializes, a style provider may be used to set properties that affect the component's visual appearance.
FeathersControl
  thumbFactory : Function
A function used to generate the scroll bar's thumb sub-component.
SimpleScrollBar
  thumbProperties : Object
An object that stores properties for the scroll bar's thumb, and the properties will be passed down to the thumb when the scroll bar validates.
SimpleScrollBar
  value : Number
The current numeric value.
SimpleScrollBar
 Inheritedwidth : Number
[override] The width of the component, in pixels.
FeathersControl
Protected Properties
 PropertyDefined By
 InheritedactualHeight : Number = 0
The final height value that should be used for layout.
FeathersControl
 InheritedactualWidth : Number = 0
The final width value that should be used for layout.
FeathersControl
 InheriteddefaultStyleProvider : IStyleProvider
[read-only] When the FeathersControl constructor is called, the globalStyleProvider property is set to this value.
FeathersControl
 InheritedexplicitHeight : Number = NaN
The height value explicitly set by calling the height setter or setSize().
FeathersControl
 InheritedexplicitWidth : Number = NaN
The width value explicitly set by calling the width setter or setSize().
FeathersControl
  thumb : Button
The thumb sub-component.
SimpleScrollBar
  thumbName : String
DEPRECATED: Replaced by thumbStyleName.
SimpleScrollBar
  thumbStyleName : String = feathers-simple-scroll-bar-thumb
The value added to the styleNameList of the thumb.
SimpleScrollBar
Public Methods
 MethodDefined By
  
Constructor.
SimpleScrollBar
 Inherited
hideFocus():void
If the visual indicator of focus has been displayed by showFocus(), call this function to hide it.
FeathersControl
 Inherited
invalidate(flag:String):void
Call this function to tell the UI control that a redraw is pending.
FeathersControl
 Inherited
isInvalid(flag:String = null):Boolean
Indicates whether the control is pending validation or not.
FeathersControl
 Inherited
move(x:Number, y:Number):void
Sets both the x and the y positions of the control in a single function call.
FeathersControl
 Inherited
setSize(width:Number, height:Number):void
Sets both the width and the height of the control in a single function call.
FeathersControl
 Inherited
showFocus():void
If the object has focus, an additional visual indicator may optionally be displayed to highlight the object.
FeathersControl
 Inherited
validate():void
Immediately validates the display object, if it is invalid.
FeathersControl
Protected Methods
 MethodDefined By
  
If the component's dimensions have not been set explicitly, it will measure its content and determine an ideal size for itself.
SimpleScrollBar
 Inherited
clearInvalidationFlag(flag:String):void
Clears an invalidation flag.
FeathersControl
  
Creates and adds the thumb sub-component and removes the old instance, if one exists.
SimpleScrollBar
 Inherited
draw():void
Override to customize layout and to adjust properties of children.
FeathersControl
 Inherited
focusInHandler(event:Event):void
Default event handler for FeathersEventType.FOCUS_IN that may be overridden in subclasses to perform additional actions when the component receives focus.
FeathersControl
 Inherited
focusOutHandler(event:Event):void
Default event handler for FeathersEventType.FOCUS_OUT that may be overridden in subclasses to perform additional actions when the component loses focus.
FeathersControl
 Inherited
initialize():void
Called the first time that the UI control is added to the stage, and you should override this function to customize the initialization process.
FeathersControl
 Inherited
Updates the focus indicator skin by showing or hiding it and adjusting its position and dimensions.
FeathersControl
 Inherited
setInvalidationFlag(flag:String):void
Sets an invalidation flag.
FeathersControl
 Inherited
setSizeInternal(width:Number, height:Number, canInvalidate:Boolean):Boolean
Sets the width and height of the control, with the option of invalidating or not.
FeathersControl
Events
 Event Summary Defined By
  Dispatched when the user starts dragging the scroll bar's thumb.SimpleScrollBar
  Dispatched when the scroll bar's value changes.SimpleScrollBar
 InheritedDispatched after the component has validated for the first time.FeathersControl
  Dispatched when the user stops dragging the scroll bar's thumb.SimpleScrollBar
 InheritedDispatched after initialize() has been called, but before the first time that draw() has been called.FeathersControl
 InheritedDispatched when the width or height of the control changes.FeathersControl
Public Constants
 ConstantDefined By
  DEFAULT_CHILD_NAME_THUMB : String = feathers-simple-scroll-bar-thumb
[static] DEPRECATED: Replaced by Scroller.DEFAULT_CHILD_STYLE_NAME_THUMB.
SimpleScrollBar
  DEFAULT_CHILD_STYLE_NAME_THUMB : String = feathers-simple-scroll-bar-thumb
[static] The default value added to the styleNameList of the thumb.
SimpleScrollBar
  DIRECTION_HORIZONTAL : String = horizontal
[static] The scroll bar's thumb may be dragged horizontally (on the x-axis).
SimpleScrollBar
  DIRECTION_VERTICAL : String = vertical
[static] The scroll bar's thumb may be dragged vertically (on the y-axis).
SimpleScrollBar
 InheritedINVALIDATION_FLAG_ALL : String = all
[static] Flag to indicate that everything is invalid and should be redrawn.
FeathersControl
 InheritedINVALIDATION_FLAG_DATA : String = data
[static] Invalidation flag to indicate that the primary data displayed by the UI control has changed.
FeathersControl
 InheritedINVALIDATION_FLAG_FOCUS : String = focus
[static] Invalidation flag to indicate that the focus of the UI control has changed.
FeathersControl
 InheritedINVALIDATION_FLAG_LAYOUT : String = layout
[static] Invalidation flag to indicate that the layout of the UI control has changed.
FeathersControl
 InheritedINVALIDATION_FLAG_SCROLL : String = scroll
[static] Invalidation flag to indicate that the scroll position of the UI control has changed.
FeathersControl
 InheritedINVALIDATION_FLAG_SELECTED : String = selected
[static] Invalidation flag to indicate that the selection of the UI control has changed.
FeathersControl
 InheritedINVALIDATION_FLAG_SIZE : String = size
[static] Invalidation flag to indicate that the dimensions of the UI control have changed.
FeathersControl
 InheritedINVALIDATION_FLAG_SKIN : String = skin
[static] Invalidation flag to indicate that the skin of the UI control has changed.
FeathersControl
 InheritedINVALIDATION_FLAG_STATE : String = state
[static] Invalidation flag to indicate that the state has changed.
FeathersControl
 InheritedINVALIDATION_FLAG_STYLES : String = styles
[static] Invalidation flag to indicate that the styles or visual appearance of the UI control has changed.
FeathersControl
Property Detail
clampToRangeproperty
public var clampToRange:Boolean = false

Determines if the value should be clamped to the range between the minimum and maximum. If false and the value is outside of the range, the thumb will shrink as if the range were increasing.

In the following example, the clamping behavior is updated:

         scrollBar.clampToRange = true;

The default value is false.

customThumbNameproperty 
customThumbName:String

DEPRECATED: Replaced by customThumbStyleName.

DEPRECATION WARNING: This property is deprecated starting with Feathers 2.1. It will be removed in a future version of Feathers according to the standard Feathers deprecation policy.


Implementation
    public function get customThumbName():String
    public function set customThumbName(value:String):void

See also

customThumbStyleNameproperty 
customThumbStyleName:String

A style name to add to the scroll bar's thumb sub-component. Typically used by a theme to provide different styles to different scroll bars.

In the following example, a custom thumb style name is passed to the scroll bar:

         scrollBar.customThumbStyleName = "my-custom-thumb";

In your theme, you can target this sub-component style name to provide different styles than the default:

         getStyleProviderForClass( Button ).setFunctionForStyleName( "my-custom-thumb", setCustomThumbStyles );

The default value is null.


Implementation
    public function get customThumbStyleName():String
    public function set customThumbStyleName(value:String):void

See also

directionproperty 
direction:String

Determines if the scroll bar's thumb can be dragged horizontally or vertically. When this value changes, the scroll bar's width and height values do not change automatically.

In the following example, the direction is changed to vertical:

         scrollBar.direction = SimpleScrollBar.DIRECTION_VERTICAL;

The default value is SimpleScrollBar.DIRECTION_HORIZONTAL.


Implementation
    public function get direction():String
    public function set direction(value:String):void

See also

globalStyleProviderproperty 
public static var globalStyleProvider:IStyleProvider

The default IStyleProvider for all SimpleScrollBar components.

The default value is null.

See also

liveDraggingproperty 
public var liveDragging:Boolean = true

Determines if the scroll bar dispatches the Event.CHANGE event every time the thumb moves, or only once it stops moving.

In the following example, live dragging is disabled:

         scrollBar.liveDragging = false;

The default value is true.

maximumproperty 
maximum:Number

The maximum numeric value of the range.

In the following example, the maximum is changed to 100:

         component.minimum = 0;
         component.maximum = 100;
         component.step = 1;
         component.page = 10
         component.value = 12;

The default value is 0.


Implementation
    public function get maximum():Number
    public function set maximum(value:Number):void

See also

minimumproperty 
minimum:Number

The minimum numeric value of the range.

In the following example, the minimum is changed to 0:

         component.minimum = 0;
         component.maximum = 100;
         component.step = 1;
         component.page = 10
         component.value = 12;

The default value is 0.


Implementation
    public function get minimum():Number
    public function set minimum(value:Number):void

See also

paddingproperty 
padding:Number

Quickly sets all padding properties to the same value. The padding getter always returns the value of paddingTop, but the other padding values may be different.

In the following example, the padding is changed to 20 pixels:

         scrollBar.padding = 20;

The default value is 0.


Implementation
    public function get padding():Number
    public function set padding(value:Number):void

See also

paddingBottomproperty 
paddingBottom:Number

The minimum space, in pixels, below the thumb.

In the following example, the bottom padding is changed to 20 pixels:

         scrollBar.paddingBottom = 20;

The default value is 0.


Implementation
    public function get paddingBottom():Number
    public function set paddingBottom(value:Number):void
paddingLeftproperty 
paddingLeft:Number

The minimum space, in pixels, to the left of the thumb.

In the following example, the left padding is changed to 20 pixels:

         scrollBar.paddingLeft = 20;

The default value is 0.


Implementation
    public function get paddingLeft():Number
    public function set paddingLeft(value:Number):void
paddingRightproperty 
paddingRight:Number

The minimum space, in pixels, to the right of the thumb.

In the following example, the right padding is changed to 20 pixels:

         scrollBar.paddingRight = 20;

The default value is 0.


Implementation
    public function get paddingRight():Number
    public function set paddingRight(value:Number):void
paddingTopproperty 
paddingTop:Number

The minimum space, in pixels, above the thumb.

In the following example, the top padding is changed to 20 pixels:

         scrollBar.paddingTop = 20;

The default value is 0.


Implementation
    public function get paddingTop():Number
    public function set paddingTop(value:Number):void
pageproperty 
page:Number

The amount the scroll bar value must change to get from one "page" to the next.

In the following example, the page is changed to 10:

         scrollBar.minimum = 0;
         scrollBar.maximum = 100;
         scrollBar.step = 1;
         scrollBar.page = 10
         scrollBar.value = 12;

The default value is 0.


Implementation
    public function get page():Number
    public function set page(value:Number):void

See also

repeatDelayproperty 
repeatDelay:Number

The time, in seconds, before actions are repeated. The first repeat happens after a delay that is five times longer than the following repeats.

In the following example, the repeat delay is changed to 500 milliseconds:

         scrollBar.repeatDelay = 0.5;

The default value is 0.05.


Implementation
    public function get repeatDelay():Number
    public function set repeatDelay(value:Number):void
stepproperty 
step:Number

The amount the value must change to increment or decrement.

In the following example, the step is changed to 1:

         component.minimum = 0;
         component.maximum = 100;
         component.step = 1;
         component.page = 10
         component.value = 12;

The default value is 0.


Implementation
    public function get step():Number
    public function set step(value:Number):void

See also

thumbproperty 
protected var thumb:Button

The thumb sub-component.

For internal use in subclasses.

See also

thumbFactoryproperty 
thumbFactory:Function

A function used to generate the scroll bar's thumb sub-component. The thumb must be an instance of Button. This factory can be used to change properties on the thumb when it is first created. For instance, if you are skinning Feathers components without a theme, you might use this factory to set skins and other styles on the thumb.

The function should have the following signature:

function():Button

In the following example, a custom thumb factory is passed to the scroll bar:

         scrollBar.thumbFactory = function():Button
         {
             var thumb:Button = new Button();
             thumb.defaultSkin = new Image( upTexture );
             thumb.downSkin = new Image( downTexture );
             return thumb;
         };

The default value is null.


Implementation
    public function get thumbFactory():Function
    public function set thumbFactory(value:Function):void

See also

thumbNameproperty 
thumbName:String

DEPRECATED: Replaced by thumbStyleName.

DEPRECATION WARNING: This property is deprecated starting with Feathers 2.1. It will be removed in a future version of Feathers according to the standard Feathers deprecation policy.


Implementation
    protected function get thumbName():String
    protected function set thumbName(value:String):void

See also

thumbPropertiesproperty 
thumbProperties:Object

An object that stores properties for the scroll bar's thumb, and the properties will be passed down to the thumb when the scroll bar validates. For a list of available properties, refer to feathers.controls.Button.

If the subcomponent has its own subcomponents, their properties can be set too, using attribute @ notation. For example, to set the skin on the thumb which is in a SimpleScrollBar, which is in a List, you can use the following syntax:

list.verticalScrollBarProperties.@thumbProperties.defaultSkin = new Image(texture);

Setting properties in a thumbFactory function instead of using thumbProperties will result in better performance.

In the following example, the scroll bar's thumb properties are updated:

         scrollBar.thumbProperties.defaultSkin = new Image( upTexture );
         scrollBar.thumbProperties.downSkin = new Image( downTexture );

The default value is null.


Implementation
    public function get thumbProperties():Object
    public function set thumbProperties(value:Object):void

See also

thumbStyleNameproperty 
protected var thumbStyleName:String = feathers-simple-scroll-bar-thumb

The value added to the styleNameList of the thumb. This variable is protected so that sub-classes can customize the thumb style name in their constructors instead of using the default style name defined by DEFAULT_CHILD_STYLE_NAME_THUMB.

To customize the thumb style name without subclassing, see customThumbStyleName.

See also

valueproperty 
value:Number

The current numeric value.

In the following example, the value is changed to 12:

         component.minimum = 0;
         component.maximum = 100;
         component.step = 1;
         component.page = 10
         component.value = 12;

The default value is 0.


Implementation
    public function get value():Number
    public function set value(value:Number):void

See also

Constructor Detail
SimpleScrollBar()Constructor
public function SimpleScrollBar()

Constructor.

Method Detail
autoSizeIfNeeded()method
protected function autoSizeIfNeeded():Boolean

If the component's dimensions have not been set explicitly, it will measure its content and determine an ideal size for itself. If the explicitWidth or explicitHeight member variables are set, those value will be used without additional measurement. If one is set, but not the other, the dimension with the explicit value will not be measured, but the other non-explicit dimension will still need measurement.

Calls setSizeInternal() to set up the actualWidth and actualHeight member variables used for layout.

Meant for internal use, and subclasses may override this function with a custom implementation.

Returns
Boolean
createThumb()method 
protected function createThumb():void

Creates and adds the thumb sub-component and removes the old instance, if one exists.

Meant for internal use, and subclasses may override this function with a custom implementation.

See also

Event Detail
beginInteraction Event
Event Object Type: starling.events.Event
Event.type property = feathers.events.FeathersEventType.BEGIN_INTERACTION

Dispatched when the user starts dragging the scroll bar's thumb.

The properties of the event object have the following values:

PropertyValue
bubblesfalse
currentTargetThe Object that defines the event listener that handles the event. For example, if you use myButton.addEventListener() to register an event listener, myButton is the value of the currentTarget.
datanull
targetThe Object that dispatched the event; it is not always the Object listening for the event. Use the currentTarget property to always access the Object listening for the event.

The FeathersEventType.BEGIN_INTERACTION event type is used by many UI controls where a drag or other interaction happens over time. An example is a Slider control where the user touches the thumb to begin dragging.
change Event  
Event Object Type: starling.events.Event
Event.type property = starling.events.Event.CHANGE

Dispatched when the scroll bar's value changes.

The properties of the event object have the following values:

PropertyValue
bubblesfalse
currentTargetThe Object that defines the event listener that handles the event. For example, if you use myButton.addEventListener() to register an event listener, myButton is the value of the currentTarget.
datanull
targetThe Object that dispatched the event; it is not always the Object listening for the event. Use the currentTarget property to always access the Object listening for the event.

endInteraction Event  
Event Object Type: starling.events.Event
Event.type property = feathers.events.FeathersEventType.END_INTERACTION

Dispatched when the user stops dragging the scroll bar's thumb.

The properties of the event object have the following values:

PropertyValue
bubblesfalse
currentTargetThe Object that defines the event listener that handles the event. For example, if you use myButton.addEventListener() to register an event listener, myButton is the value of the currentTarget.
datanull
targetThe Object that dispatched the event; it is not always the Object listening for the event. Use the currentTarget property to always access the Object listening for the event.

The FeathersEventType.END_INTERACTION event type is used by many UI controls where a drag or other interaction happens over time. An example is a Slider control where the user stops touching the thumb after dragging.

Depending on the control, the result of the interaction may continue after the interaction ends. For instance, a Scroller may be "thrown", and the scrolling will continue animating after the user has finished interacting with it.

Constant Detail
DEFAULT_CHILD_NAME_THUMBConstant
public static const DEFAULT_CHILD_NAME_THUMB:String = feathers-simple-scroll-bar-thumb

DEPRECATED: Replaced by Scroller.DEFAULT_CHILD_STYLE_NAME_THUMB.

DEPRECATION WARNING: This property is deprecated starting with Feathers 2.1. It will be removed in a future version of Feathers according to the standard Feathers deprecation policy.

See also

DEFAULT_CHILD_STYLE_NAME_THUMBConstant 
public static const DEFAULT_CHILD_STYLE_NAME_THUMB:String = feathers-simple-scroll-bar-thumb

The default value added to the styleNameList of the thumb.

See also

DIRECTION_HORIZONTALConstant 
public static const DIRECTION_HORIZONTAL:String = horizontal

The scroll bar's thumb may be dragged horizontally (on the x-axis).

See also

DIRECTION_VERTICALConstant 
public static const DIRECTION_VERTICAL:String = vertical

The scroll bar's thumb may be dragged vertically (on the y-axis).

See also