flashx.textLayout.compose.FlowComposerBase - Adobe® Flex® 4 Language Reference (Flex 4)

Package	flashx.textLayout.compose
Class	public class FlowComposerBase
Inheritance	FlowComposerBase Object
Subclasses	StandardFlowComposer

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

The FlowComposerBase class is the base class for Text Layout Framework flow composer classes, which control the composition of text lines in ContainerController objects.

FlowComposerBase is a utility class that implements methods and properties that are common to several types of flow composer. Application code would not typically instantiate or use this class (unless extending it to create a custom flow composer).

Public Properties

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	Property		Defined By
		constructor : Object A reference to the class object or constructor function for a given object instance.	Object
		damageAbsoluteStart : int [read-only] The absolute position immediately preceding the first element in the text flow that requires composition and updating.	FlowComposerBase
		numLines : int [read-only] The total number of lines in the flow.	FlowComposerBase
		prototype : Object [static] A reference to the prototype object of a class or function object.	Object
		swfContext : ISWFContext The ISWFContext instance used to make FTE calls as needed.	FlowComposerBase
		textFlow : flashx.textLayout.elements:TextFlow [read-only] The TextFlow object to which this flow composer is attached.	FlowComposerBase

Public Methods

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	Method		Defined By
		FlowComposerBase() Constructor.	FlowComposerBase
		damage(startPosition:int, damageLength:int, damageType:String):void Mark lines as damaged and needing a recompose.	FlowComposerBase
		findLineAtPosition(absolutePosition:int, preferPrevious:Boolean = false):flashx.textLayout.compose:TextFlowLine Returns the TextFlowLine object containing the content at the specified position.	FlowComposerBase
		findLineIndexAtPosition(absolutePosition:int, preferPrevious:Boolean = false):int Returns the sequential line number of the TextFlowLine object that contains the content at the specified position.	FlowComposerBase
		getLineAt(index:int):flashx.textLayout.compose:TextFlowLine Returns the line with the specified line number.	FlowComposerBase
		hasOwnProperty(name:String):Boolean Indicates whether an object has a specified property defined.	Object
		isDamaged(absolutePosition:int):Boolean Indicates whether any TextFlowLine objects between the beginning of the flow and the line containing the content at the specified position are marked as damaged.	FlowComposerBase
		isPrototypeOf(theClass:Object):Boolean Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.	Object
		propertyIsEnumerable(name:String):Boolean Indicates whether the specified property exists and is enumerable.	Object
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Sets the availability of a dynamic property for loop operations.	Object
		toLocaleString():String Returns the string representation of this object, formatted according to locale-specific conventions.	Object
		toString():String Returns the string representation of the specified object.	Object
		updateLengths(startPosition:int, deltaLength:int):void Update the lengths in the lines to maintain mapping to the TextFlow.	FlowComposerBase
		valueOf():Object Returns the primitive value of the specified object.	Object

Property Detail

damageAbsoluteStart

property

damageAbsoluteStart:int [read-only]

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

The absolute position immediately preceding the first element in the text flow that requires composition and updating.

Implementation
public function get damageAbsoluteStart():int

numLines

property

numLines:int [read-only]

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

The total number of lines in the flow.

Implementation
public function get numLines():int

swfContext

property

swfContext:ISWFContext

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

The ISWFContext instance used to make FTE calls as needed.

By default, the ISWFContext implementation is this FlowComposerBase object. Applications can provide a custom implementation to use fonts embedded in a different SWF file or to cache and reuse text lines.

Implementation
public function get swfContext():ISWFContext
public function set swfContext(value:ISWFContext):void

textFlow

property

textFlow:flashx.textLayout.elements:TextFlow [read-only]

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

The TextFlow object to which this flow composer is attached.

Implementation
public function get textFlow():flashx.textLayout.elements:TextFlow

FlowComposerBase

()

Constructor

public function FlowComposerBase()

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

Constructor.

Method Detail

damage

()

method

public function damage(startPosition:int, damageLength:int, damageType:String):void

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

Mark lines as damaged and needing a recompose.

Parameters

	`startPosition:int` — beginning of range to damage

	`damageLength:int` — number of characters to damage

	`damageType:String` — type of damage. One of flashx.textLayout.compose.FlowDamageType

findLineAtPosition

()

method

 public function findLineAtPosition(absolutePosition:int, preferPrevious:Boolean = false):flashx.textLayout.compose:TextFlowLine

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

Returns the TextFlowLine object containing the content at the specified position.

A position can be considered to be the division between two characters or other elements of a text flow. If the value in absolutePosition is a position between the last element of one line and the first element of the next, then the preceding line is returned if the preferPrevious parameter is set to true and the later line is returned if the preferPrevious parameter is set to false.

Parameters

	`absolutePosition:int` — The position of the content for which you want the TextFlowLine object.

	`preferPrevious:Boolean` (default = `false`) — Specifies which line to return when the position is between the last element of one line and the first element of the next.

Returns

flashx.textLayout.compose:TextFlowLine — the TextFlowLine containing the content at the specified position, or null if not found.

findLineIndexAtPosition

()

method

public function findLineIndexAtPosition(absolutePosition:int, preferPrevious:Boolean = false):int

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

Returns the sequential line number of the TextFlowLine object that contains the content at the specified position.

The number of the first line is 0 and the number of the last line is equal to the number of lines minus one. If the position specified in absolutePosition is past the end of the text flow, this method must return the number that will be assigned to the next new line added to the text flow (which is equal to the number of current lines).

A position can be considered to be the division between two characters or other elements of a text flow. If the value in absolutePosition is a position between the last line of one container and the first line of the next, then the preceding container is returned if the preferPrevious parameter is set to true and the later container is returned if the preferPrevious parameter is set to false.

Parameters

	`absolutePosition:int` — The position of the content for which you want the text line.

	`preferPrevious:Boolean` (default = `false`) — Specifies which container index to return when the position is between the last line in one container and the first line in the next.

Returns

int — the index of the text line at the specified position. If not found, treats as past the end and returns the number of lines.

getLineAt

()

method

public function getLineAt(index:int):flashx.textLayout.compose:TextFlowLine

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

Returns the line with the specified line number.

The list of lines is numbered from zero to the number of lines minus one. If the value in index is outside the bounds of the list of lines, then this function returns null.

Parameters

index:int — The line number of the TextFlowLine object to return.

Returns

flashx.textLayout.compose:TextFlowLine — the TextFlowLine with the specified line number, or null, if not found.

isDamaged

()

method

public function isDamaged(absolutePosition:int):Boolean

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

Indicates whether any TextFlowLine objects between the beginning of the flow and the line containing the content at the specified position are marked as damaged.

Parameters

absolutePosition:int — the last position in the area of interest

Returns

Boolean — true if any of the TextFlowLine objects from the start of the flow up to the line containing the content at absolutePosition are marked as damaged.

updateLengths

()

method

public function updateLengths(startPosition:int, deltaLength:int):void

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

Update the lengths in the lines to maintain mapping to the TextFlow.

Parameters

	`startPosition:int` — beginning of change in length

	`deltaLength:int` — change in number of characters.