Adobe® Flex® 4 Language Reference
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flashx.textLayout.compose 
TextFlowLine 
Packageflashx.textLayout.compose
Classpublic final class TextFlowLine
InheritanceTextFlowLine Inheritance Object
Implements IVerticalJustificationLine

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

The TextFlowLine class represents a single line of text in a text flow.

Use this class to access information about how a line of text has been composed: its position, height, width, and so on. When the text flow (TextFlow) is modified, the lines immediately before and at the site of the modification are marked as invalid because they need to be recomposed. Lines after the site of the modification might not be damaged immediately, but they might be regenerated once the text is composed. You can access a TextFlowLine that has been damaged, but any values you access reflect the old state of the TextFlow. When the TextFlow is recomposed, it generates new lines and you can get the new line for a given position by calling TextFlow.flowComposer.findLineAtPosition().



Public Properties
 PropertyDefined By
  absoluteStart : int
[read-only] The location of the line as an absolute character position in the TextFlow object.
TextFlowLine
  ascent : Number
[read-only] Specifies the number of pixels from the baseline to the top of the tallest characters in the line.
TextFlowLine
  columnIndex : int
[read-only] The number of the column in which the line has been placed, with the first column being 0.
TextFlowLine
 Inheritedconstructor : Object
A reference to the class object or constructor function for a given object instance.
Object
  controller : ContainerController
[read-only] The controller (ContainerController object) for the container in which the line has been placed.
TextFlowLine
  descent : Number
[read-only] Specifies the number of pixels from the baseline to the bottom of the lowest-descending characters in the line.
TextFlowLine
  height : Number
[read-only] The height of the line in pixels.
TextFlowLine
  lineOffset : Number
[read-only] The line's offset in pixels from the appropriate container inset (as dictated by paragraph direction and container block progression), prior to alignment of lines in the paragraph.
TextFlowLine
  location : int
[read-only] One of the values from TextFlowLineLocation for specifying a line's location within a paragraph.
TextFlowLine
  paragraph : ParagraphElement
[read-only] The paragraph (ParagraphElement) in which the line resides.
TextFlowLine
 Inheritedprototype : Object
[static] A reference to the prototype object of a class or function object.
Object
  spaceAfter : Number
[read-only] The amount of space to leave after the line.
TextFlowLine
  spaceBefore : Number
[read-only] The amount of space to leave before the line.
TextFlowLine
  textHeight : Number
[read-only] The height of the text line, which is equal to ascent plus descent.
TextFlowLine
  textLength : int
[read-only] The number of characters to the next line, including trailing spaces.
TextFlowLine
  textLineExists : Boolean
[read-only] Indicates whether the flash.text.engine.TextLine object for this TextFlowLine exists.
TextFlowLine
  unjustifiedTextWidth : Number
[read-only] The width of the line if it was not justified.
TextFlowLine
  validity : String
[read-only] The validity of the line.
TextFlowLine
  x : Number
The horizontal position of the line relative to its container, expressed as the offset in pixels from the left of the container.
TextFlowLine
  y : Number
The vertical position of the line relative to its container, expressed as the offset in pixels from the top of the container.
TextFlowLine
Public Methods
 MethodDefined By
  
TextFlowLine(textLine:flash.text.engine:TextLine, paragraph:ParagraphElement, outerTargetWidth:Number = 0, lineOffset:Number = 0, absoluteStart:int = 0, numChars:int = 0)
Constructor - creates a new TextFlowLine instance.
TextFlowLine
  
Returns the bounds of the line as a rectangle.
TextFlowLine
  
Returns the flash.text.engine.TextLine object for this line, which might be recreated if it does not exist due to garbage collection.
TextFlowLine
 Inherited
Indicates whether an object has a specified property defined.
Object
 Inherited
Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.
Object
 Inherited
Indicates whether the specified property exists and is enumerable.
Object
 Inherited
Sets the availability of a dynamic property for loop operations.
Object
 Inherited
Returns the string representation of this object, formatted according to locale-specific conventions.
Object
 Inherited
Returns the string representation of the specified object.
Object
 Inherited
Returns the primitive value of the specified object.
Object
Property Detail

absoluteStart

property
absoluteStart:int  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

The location of the line as an absolute character position in the TextFlow object.



Implementation
    public function get absoluteStart():int

See also

TextFlow

ascent

property 
ascent:Number  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

Specifies the number of pixels from the baseline to the top of the tallest characters in the line. For a TextLine that contains only a graphic element, ascent is set to 0.



Implementation
    public function get ascent():Number

columnIndex

property 
columnIndex:int  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

The number of the column in which the line has been placed, with the first column being 0.



Implementation
    public function get columnIndex():int

controller

property 
controller:ContainerController  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

The controller (ContainerController object) for the container in which the line has been placed.



Implementation
    public function get controller():ContainerController

See also

descent

property 
descent:Number  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

Specifies the number of pixels from the baseline to the bottom of the lowest-descending characters in the line. For a TextLine that contains only a graphic element, descent is set to 0.



Implementation
    public function get descent():Number

height

property 
height:Number  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

The height of the line in pixels.



Implementation
    public function get height():Number

See also

lineOffset

property 
lineOffset:Number  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

The line's offset in pixels from the appropriate container inset (as dictated by paragraph direction and container block progression), prior to alignment of lines in the paragraph.



Implementation
    public function get lineOffset():Number

location

property 
location:int  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

One of the values from TextFlowLineLocation for specifying a line's location within a paragraph.



Implementation
    public function get location():int

See also

ParagraphElement
TextFlowLineLocation

paragraph

property 
paragraph:ParagraphElement  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

The paragraph (ParagraphElement) in which the line resides.



Implementation
    public function get paragraph():ParagraphElement

See also

ParagraphElement

spaceAfter

property 
spaceAfter:Number  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

The amount of space to leave after the line.

If the line is the last line of a paragraph that has a space-after, the line will have a spaceAfter value. If the line comes at the bottom of a column, then the spaceAfter is ignored. Otherwise, the line comes before another line in the column, and the following line must be positioned vertically to insure that there is at least this much space left between this last line of the paragraph and the first line of the following paragraph.



Implementation
    public function get spaceAfter():Number

See also

spaceBefore

property 
spaceBefore:Number  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

The amount of space to leave before the line.

If the line is the first line of a paragraph that has a space-before applied, the line will have a spaceBefore value. If the line comes at the top of a column, spaceBefore is ignored. Otherwise, the line follows another line in the column, and it is positioned vertically to insure that there is at least this much space left between this line and the last line of the preceding paragraph.



Implementation
    public function get spaceBefore():Number

See also

textHeight

property 
textHeight:Number  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

The height of the text line, which is equal to ascent plus descent. The value is calculated based on the difference between the baselines that bound the line, either ideographic top and bottom or ascent and descent depending on whether the baseline at y=0 is ideographic (for example, TextBaseline.IDEOGRAPHIC_TOP) or not.



Implementation
    public function get textHeight():Number

See also

textLength

property 
textLength:int  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

The number of characters to the next line, including trailing spaces.



Implementation
    public function get textLength():int

textLineExists

property 
textLineExists:Boolean  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

Indicates whether the flash.text.engine.TextLine object for this TextFlowLine exists. The value is true if the TextLine object has not been garbage collected and false if it has been.



Implementation
    public function get textLineExists():Boolean

See also

unjustifiedTextWidth

property 
unjustifiedTextWidth:Number  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

The width of the line if it was not justified. For unjustified text, this value is the same as textLength. For justified text, this value is what the length would have been without justification, and textLength represents the actual line width. For example, when the following String is justified and assigned a width of 500, it has an actual width of 500 but an unjustified width of 268.9921875.

TBD: add graphic of justified line



Implementation
    public function get unjustifiedTextWidth():Number

validity

property 
validity:String  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

The validity of the line.

A line can be invalid if the text, the attributes applied to it, or the controller settings have changed since the line was created. An invalid line can still be displayed, and you can use it, but the values used will be the values at the time it was created. The line represented by textLine also will be in an invalid state.



Implementation
    public function get validity():String

See also

x

property 
x:Number

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

The horizontal position of the line relative to its container, expressed as the offset in pixels from the left of the container.

Note: Although this property is technically read-write, you should treat it as read-only. The setter exists only to satisfy the requirements of the IVerticalJustificationLine interface that defines both a getter and setter for this property. Use of the setter, though possible, will lead to unpredictable results.



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

See also

y

property 
y:Number

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

The vertical position of the line relative to its container, expressed as the offset in pixels from the top of the container.

Note: Although this property is technically read-write, you should treat it as read-only. The setter exists only to satisfy the requirements of the IVerticalJustificationLine interface that defines both a getter and setter for this property. Use of the setter, though possible, will lead to unpredictable results.



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

See also

Constructor Detail

TextFlowLine

()Constructor
public function TextFlowLine(textLine:flash.text.engine:TextLine, paragraph:ParagraphElement, outerTargetWidth:Number = 0, lineOffset:Number = 0, absoluteStart:int = 0, numChars:int = 0)

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

Constructor - creates a new TextFlowLine instance.

Note: No client should call this. It's exposed for writing your own composer.

Parameters
textLine:flash.text.engine:TextLine — The TextLine display object to use for this line.
 
paragraph:ParagraphElement — The paragraph (ParagraphElement) in which to place the line.
 
outerTargetWidth:Number (default = 0) — The width the line is composed to, excluding indents.
 
lineOffset:Number (default = 0) — The line's offset in pixels from the appropriate container inset (as dictated by paragraph direction and container block progression), prior to alignment of lines in the paragraph.
 
absoluteStart:int (default = 0) — The character position in the text flow at which the line begins.
 
numChars:int (default = 0) — The number of characters in the line.

See also

Method Detail

computePointSelectionRectangle

()method
tlf_internal function computePointSelectionRectangle(idx:int, container:DisplayObject, prevLine:flashx.textLayout.compose:TextFlowLine, nextLine:flashx.textLayout.compose:TextFlowLine, constrainSelRect:Boolean):Rectangle

Parameters

idx:int
 
container:DisplayObject
 
prevLine:flashx.textLayout.compose:TextFlowLine
 
nextLine:flashx.textLayout.compose:TextFlowLine
 
constrainSelRect:Boolean

Returns
Rectangle

getBounds

()method 
public function getBounds():Rectangle

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

Returns the bounds of the line as a rectangle.

Returns
Rectangle — a rectangle that represents the boundaries of the line.

getTextLine

()method 
public function getTextLine(forceValid:Boolean = false):flash.text.engine:TextLine

Language Version: ActionScript 3.0
Runtime Versions: Flash Player 10, AIR 1.5

Returns the flash.text.engine.TextLine object for this line, which might be recreated if it does not exist due to garbage collection. Set forceValid to true to cause the TextLine to be regenerated. Returns null if the TextLine cannot be recreated.

Parameters

forceValid:Boolean (default = false) — if true, the TextLine is regenerated, if it exists but is invalid.

Returns
flash.text.engine:TextLine — object for this line or null if the TextLine object cannot be recreated.

See also