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HorizontalLayout  - AS3 Flex

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Appendixes

What's New
Compiler Errors
Compiler Warnings
Run-Time Errors
Migrating to ActionScript 3
Supported Character Sets
MXML Only Tags
Motion XML Elements
Timed Text Tags
List of deprecated elements
Accessibility Implementation Constants
How to Use ActionScript Examples
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(Preview)
Packagespark.layouts
Classpublic class HorizontalLayout
InheritanceHorizontalLayout Inheritance LayoutBase Inheritance OnDemandEventDispatcher Inheritance Object

Language Version: ActionScript 3.0
Product Version: Flex 4
Runtime Versions: Flash Player 10, AIR 1.5

The HorizontalLayout class arranges the layout elements in a horizontal sequence, left to right, with optional gaps between the elements and optional padding around the elements.

The horizontal position of the elements is determined by arranging them in a horizontal sequence, left to right, taking into account the padding before the first element and the gaps between the elements.

The vertical position of the elements is determined by the layout's verticalAlign property.

During the execution of the measure() method, the default size of the container is calculated by accumulating the preferred sizes of the elements, including gaps and padding. When the requestedColumnCount property is set to a value other than -1, only the space for that many elements is measured, starting from the first element.

During the execution of the updateDisplayList() method, the width of each element is calculated according to the following rules, listed in their respective order of precedence (element's minimum width and maximum width are always respected):

  • If variableColumnWidth is false, then set the element's width to the value of the columnWidth property.
  • If the element's percentWidth is set, then calculate the element's width by distributing the available container width between all elements with percentWidth setting. The available container width is equal to the container width minus the gaps, the padding and the space occupied by the rest of the elements. The element's precentWidth property is ignored when the layout is virtualized.
  • Set the element's width to its preferred width.

The height of each element is calculated according to the following rules, listed in their respective order of precedence (element's minimum height and maximum height are always respected):

  • If the verticalAlign property is "justify", then set the element's height to the container height.
  • If the verticalAlign property is "contentJustify", then set the element's height to the maximum between the container's height and all elements' preferred height.
  • If the element's percentHeight property is set, then calculate the element's height as a percentage of the container's height.
  • Set the element's height to its preferred height.

MXML SyntaxexpandedHide MXML Syntax

The <s:HorizontalLayout> tag inherits all of the tag attributes of its superclass and adds the following tag attributes:

  <s:HorizontalLayout 
    Properties
    columnWidth="calculated"
    gap="6"
    paddingBottom="0"
    paddingLeft="0"
    paddingRight="0"
    paddingTop="0"
    requestedColumnCount="-1"
    requestedMaxColumnCount="-1"
    requestedMinColumnCount="-1"
    variableColumnWidth="true"
    verticalAlign="top"
  />
  

More examples



Public Properties
 PropertyDefined By
  columnCount : int
[read-only] Returns the current number of elements in view.
HorizontalLayout
  columnWidth : Number
If the variableColumnWidth property is false, then this property specifies the actual width of each layout element, in pixels.
HorizontalLayout
 Inheritedconstructor : Object
A reference to the class object or constructor function for a given object instance.
Object
  firstIndexInView : int
[read-only] The index of the first column that is part of the layout and within the layout target's scroll rectangle, or -1 if nothing has been displayed yet.
HorizontalLayout
  gap : int
The horizontal space between layout elements, in pixels.
HorizontalLayout
  horizontalAlign : String
The horizontal alignment of the content relative to the container's width.
HorizontalLayout
  lastIndexInView : int
[read-only] The index of the last column that is part of the layout and within the layout target's scroll rectangle, or -1 if nothing has been displayed yet.
HorizontalLayout
  paddingBottom : Number
The minimum number of pixels between the container's bottom edge and the bottom of all the container's layout elements.
HorizontalLayout
  paddingLeft : Number
Number of pixels between the container's left edge and the left edge of the first layout element.
HorizontalLayout
  paddingRight : Number
Number of pixels between the container's right edge and the right edge of the last layout element.
HorizontalLayout
  paddingTop : Number
The minimum number of pixels between the container's top edge and the top of all the container's layout elements.
HorizontalLayout
  requestedColumnCount : int
The measured size of this layout is wide enough to display the first requestedColumnCount layout elements.
HorizontalLayout
  requestedMaxColumnCount : int
The measured width of this layout is large enough to display at most requestedMaxColumnCount layout elements.
HorizontalLayout
  requestedMinColumnCount : int
The measured width of this layout is large enough to display at least requestedMinColumnCount layout elements.
HorizontalLayout
  variableColumnWidth : Boolean
If true, specifies that layout elements are to be allocated their preferred width.
HorizontalLayout
  verticalAlign : String
The vertical alignment of layout elements.
HorizontalLayout
Public Methods
 MethodDefined By
  
Constructor.
HorizontalLayout
  
Returns 1.0 if the specified index is completely in view, 0.0 if it's not, or a value between 0.0 and 1.0 that represents the percentage of the if the index that is partially in view.
HorizontalLayout
 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
Protected Methods
 MethodDefined By
Property Detail
Constructor Detail
Method Detail