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SparkDownloadProgressBar

Package | mx.preloaders
Class | public class SparkDownloadProgressBar
Inheritance | SparkDownloadProgressBar flash.display.Sprite
Implements | IPreloaderDisplay

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

The SparkDownloadProgressBar class displays download progress. It is used by the Preloader control to provide user feedback while the application is downloading and loading.

The download progress bar displays information about two different phases of the application: the download phase and the initialization phase.

In the Application container, use the the `preloader` property to specify the name of your subclass.

You can implement a custom download progress bar component by creating a subclass of the SparkDownloadProgressBar class. Do not implement a download progress bar as an MXML component because it loads too slowly.

See also

mx.core.Application
mx.preloaders.IPreloaderDisplay
mx.preloaders.Preloader

Public Properties

| Property | Defined By
--- | --- | ---
|  | backgroundAlpha : Number Alpha level of the SWF file or image defined by the backgroundImage property, or the color defined by the backgroundColor property. | SparkDownloadProgressBar
|  | backgroundColor : uint Background color of a download progress bar. | SparkDownloadProgressBar
|  | backgroundImage : Object The background image of the application, which is passed in by the preloader. | SparkDownloadProgressBar
|  | backgroundSize : String Scales the image specified by backgroundImage to different percentage sizes. | SparkDownloadProgressBar
|  | preloader : Sprite [write-only] The Preloader class passes in a reference to itself to the display class so that it can listen for events from the preloader. | SparkDownloadProgressBar
|  | stageHeight : Number The height of the stage, which is passed in by the Preloader class. | SparkDownloadProgressBar
|  | stageWidth : Number The width of the stage, which is passed in by the Preloader class. | SparkDownloadProgressBar
|  | visible : Boolean [override] Specifies whether the download progress bar is visible. | SparkDownloadProgressBar

Protected Properties

| Property | Defined By
--- | --- | ---
|  | initProgressTotal : uint = 6 The total number of validation events you expect to get in the initializing phase. | SparkDownloadProgressBar

Public Methods

| Method | Defined By
--- | --- | ---
|  | SparkDownloadProgressBar() Constructor. | SparkDownloadProgressBar
|  | initialize():void Called by the Preloader after the download progress bar has been added as a child of the Preloader. | SparkDownloadProgressBar

Protected Methods

| Method | Defined By
--- | --- | ---
|  | completeHandler(event:Event):void Event listener for the Event.COMPLETE event. | SparkDownloadProgressBar
|  | createChildren():void Creates the subcomponents of the display. | SparkDownloadProgressBar
|  | initCompleteHandler(event:Event):void Event listener for the FlexEvent.INIT_COMPLETE event. | SparkDownloadProgressBar
|  | initProgressHandler(event:Event):void Event listener for the FlexEvent.INIT_PROGRESS event. | SparkDownloadProgressBar
|  | progressHandler(event:ProgressEvent):void Event listener for the ProgressEvent.PROGRESS event. | SparkDownloadProgressBar
|  | rslCompleteHandler(event:RSLEvent):void Event listener for the RSLEvent.RSL_COMPLETE event. | SparkDownloadProgressBar
|  | rslErrorHandler(event:RSLEvent):void Event listener for the RSLEvent.RSL_ERROR event. | SparkDownloadProgressBar
|  | rslProgressHandler(event:RSLEvent):void Event listener for the RSLEvent.RSL_PROGRESS event. | SparkDownloadProgressBar
|  | setDownloadProgress(completed:Number, total:Number):void Updates the outer portion of the download progress bar to indicate download progress. | SparkDownloadProgressBar
|  | setInitProgress(completed:Number, total:Number):void Updates the inner portion of the download progress bar to indicate initialization progress. | SparkDownloadProgressBar
|  | showDisplayForDownloading(elapsedTime:int, event:ProgressEvent):Boolean Defines the algorithm for determining whether to show the download progress bar while in the download phase. | SparkDownloadProgressBar
|  | showDisplayForInit(elapsedTime:int, count:int):Boolean Defines the algorithm for determining whether to show the download progress bar while in the initialization phase, assuming that the display is not currently visible. | SparkDownloadProgressBar

Property Detail

backgroundAlpha | property

`backgroundAlpha:Number`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Alpha level of the SWF file or image defined by the `backgroundImage` property, or the color defined by the `backgroundColor` property. Valid values range from 0 to 1.0. Override this property to set your own value in a custom class.

You can specify either a `backgroundColor` or a `backgroundImage`, but not both.

The default value is `1.0`.

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

backgroundColor | property |

`backgroundColor:uint`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Background color of a download progress bar. Override this property to set your own value in a custom class.

You can specify either a `backgroundColor` or a `backgroundImage`, but not both.

Implementation
`public function get backgroundColor():uint`
`public function set backgroundColor(value:uint):void`

backgroundImage | property |

`backgroundImage:Object`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

The background image of the application, which is passed in by the preloader. Override this property to set your own value in a custom class.

You can specify either a `backgroundColor` or a `backgroundImage`, but not both.

A value of null means "not set". If this style and the `backgroundColor` style are undefined, the component has a transparent background.

The preloader does not display embedded images. You can only use images loaded at runtime.

The default value is `null`.

Implementation
`public function get backgroundImage():Object`
`public function set backgroundImage(value:Object):void`

backgroundSize | property |

`backgroundSize:String`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Scales the image specified by `backgroundImage` to different percentage sizes. A value of `"100%"` stretches the image to fit the entire component. To specify a percentage value, you must include the percent sign (%). A value of `"auto"`, maintains the original size of the image.

The default value is `"auto"`.

Implementation
`public function get backgroundSize():String`
`public function set backgroundSize(value:String):void`

initProgressTotal | property |

`protected var initProgressTotal:uint = 6`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

The total number of validation events you expect to get in the initializing phase. This should be an integer greater or equal to 4 (and note that if it is greater than 4 you might have an inefficiency in your initialization code)

The default value is `6`.

preloader | property |

`preloader:Sprite` [write-only]

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

The Preloader class passes in a reference to itself to the display class so that it can listen for events from the preloader.

Implementation
`public function set preloader(value:Sprite):void`

stageHeight | property |

`stageHeight:Number`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

The height of the stage, which is passed in by the Preloader class.

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

stageWidth | property |

`stageWidth:Number`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

The width of the stage, which is passed in by the Preloader class.

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

visible | property |

`visible:Boolean`[override]

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Specifies whether the download progress bar is visible.

When the Preloader control determines that the progress bar should be displayed, it sets this value to `true`. When the Preloader control determines that the progress bar should be hidden, it sets the value to `false`.

A subclass of the SparkDownloadProgressBar class should never modify this property. Instead, you can override the setter method to recognize when the Preloader control modifies it, and perform any necessary actions.

The default value is `false`.

Implementation
`public function get visible():Boolean`
`public function set visible(value:Boolean):void`
Constructor Detail

SparkDownloadProgressBar | () | Constructor

`public function SparkDownloadProgressBar()`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Constructor.

Method Detail

completeHandler | () | method

`protected function completeHandler(event:Event):void`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Event listener for the `Event.COMPLETE` event. The default implementation does nothing.

Parameters

| `event:Event` — The event object.

createChildren | () | method |

`protected function createChildren():void`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Creates the subcomponents of the display.

initCompleteHandler | () | method |

`protected function initCompleteHandler(event:Event):void`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Event listener for the `FlexEvent.INIT_COMPLETE` event. This implementation dispatches a `Event.COMPLETE` event.

Parameters

| `event:Event` — The event object

initialize | () | method |

`public function initialize():void`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Called by the Preloader after the download progress bar has been added as a child of the Preloader. This should be the starting point for configuring your download progress bar.

initProgressHandler | () | method |

`protected function initProgressHandler(event:Event):void`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Event listener for the `FlexEvent.INIT_PROGRESS` event. This implementation updates the progress bar each time the event is dispatched.

Parameters

| `event:Event` — The event object.

progressHandler | () | method |

`protected function progressHandler(event:ProgressEvent):void`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Event listener for the `ProgressEvent.PROGRESS` event. This implementation updates the progress bar with the percentage of bytes downloaded.

Parameters

| `event:ProgressEvent` — The event object.

rslCompleteHandler | () | method |

`protected function rslCompleteHandler(event:RSLEvent):void`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Event listener for the `RSLEvent.RSL_COMPLETE` event.

Parameters

| `event:RSLEvent` — The event object.

rslErrorHandler | () | method |

`protected function rslErrorHandler(event:RSLEvent):void`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Event listener for the `RSLEvent.RSL_ERROR` event. This event listner handles any errors detected when downloading an RSL.

Parameters

| `event:RSLEvent` — The event object.

rslProgressHandler | () | method |

`protected function rslProgressHandler(event:RSLEvent):void`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Event listener for the `RSLEvent.RSL_PROGRESS` event. The default implementation does nothing.

Parameters

| `event:RSLEvent` — The event object.

setDownloadProgress | () | method |

`protected function setDownloadProgress(completed:Number, total:Number):void`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Updates the outer portion of the download progress bar to indicate download progress.

Parameters

| `completed:Number` — Number of bytes of the application SWF file that have been downloaded.
| `total:Number` — Size of the application SWF file in bytes.

setInitProgress | () | method |

`protected function setInitProgress(completed:Number, total:Number):void`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Updates the inner portion of the download progress bar to indicate initialization progress.

Parameters

| `completed:Number` — Number of initialization steps that have been completed
| `total:Number` — Total number of initialization steps

showDisplayForDownloading | () | method |

`protected function showDisplayForDownloading(elapsedTime:int, event:ProgressEvent):Boolean`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Defines the algorithm for determining whether to show the download progress bar while in the download phase.

Parameters

| `elapsedTime:int` — Number of milliseconds that have elapsed since the start of the download phase.
| `event:ProgressEvent` — The ProgressEvent object that contains the `bytesLoaded` and `bytesTotal` properties.

Returns

| `Boolean` — If the return value is `true`, then show the download progress bar. The default behavior is to show the download progress bar if more than 700 milliseconds have elapsed and if Flex has downloaded less than half of the bytes of the SWF file.

showDisplayForInit | () | method |

`protected function showDisplayForInit(elapsedTime:int, count:int):Boolean`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Defines the algorithm for determining whether to show the download progress bar while in the initialization phase, assuming that the display is not currently visible.

Parameters

| `elapsedTime:int` — Number of milliseconds that have elapsed since the start of the download phase.
| `count:int` — number of times that the `initProgress` event has been received from the application.

Returns

| `Boolean` — If `true`, then show the download progress bar.

Wed Nov 15 2017, 09:50 AM +01:00