適用於 Adobe® Flash® Platform 的 ActionScript® 3.0 參考
首頁  |  隱藏套件和類別清單 |  套件  |  類別  |  新增內容  |  索引  |  附錄  |  為什麼顯示英文?
篩選: AIR 30.0 和更早版本, Flash Player 30.0 和更早版本, Flash Lite 4
Flex 4.6 和更早版本, Flash Pro CS6 和更早版本
隱藏篩選
spark.layouts.supportClasses 

LayoutBase  - AS3 Flex

套件x

最上層
adobe.utils
air.desktop
air.net
air.update
air.update.events
coldfusion.air
coldfusion.air.errors
coldfusion.air.events
coldfusion.service
coldfusion.service.events
coldfusion.service.mxml
com.adobe.acm.solutions.authoring.domain.extensions
com.adobe.acm.solutions.ccr.domain.extensions
com.adobe.consulting.pst.vo
com.adobe.dct.component
com.adobe.dct.component.datadictionary
com.adobe.dct.component.datadictionaryElement
com.adobe.dct.component.dataElementsPanel
com.adobe.dct.component.toolbars
com.adobe.dct.event
com.adobe.dct.exp
com.adobe.dct.model
com.adobe.dct.service
com.adobe.dct.service.provider
com.adobe.dct.transfer
com.adobe.dct.util
com.adobe.dct.view
com.adobe.ep.taskmanagement.domain
com.adobe.ep.taskmanagement.event
com.adobe.ep.taskmanagement.filter
com.adobe.ep.taskmanagement.services
com.adobe.ep.taskmanagement.util
com.adobe.ep.ux.attachmentlist.component
com.adobe.ep.ux.attachmentlist.domain
com.adobe.ep.ux.attachmentlist.domain.events
com.adobe.ep.ux.attachmentlist.domain.renderers
com.adobe.ep.ux.attachmentlist.skin
com.adobe.ep.ux.attachmentlist.skin.renderers
com.adobe.ep.ux.content.event
com.adobe.ep.ux.content.factory
com.adobe.ep.ux.content.handlers
com.adobe.ep.ux.content.managers
com.adobe.ep.ux.content.model.asset
com.adobe.ep.ux.content.model.preview
com.adobe.ep.ux.content.model.relation
com.adobe.ep.ux.content.model.search
com.adobe.ep.ux.content.model.toolbar
com.adobe.ep.ux.content.search
com.adobe.ep.ux.content.services
com.adobe.ep.ux.content.services.load
com.adobe.ep.ux.content.services.permissions
com.adobe.ep.ux.content.services.preview
com.adobe.ep.ux.content.services.providers
com.adobe.ep.ux.content.services.query
com.adobe.ep.ux.content.services.relationships
com.adobe.ep.ux.content.services.search.lccontent
com.adobe.ep.ux.content.services.version
com.adobe.ep.ux.content.view
com.adobe.ep.ux.content.view.components.activate
com.adobe.ep.ux.content.view.components.grid
com.adobe.ep.ux.content.view.components.grid.hover
com.adobe.ep.ux.content.view.components.grid.hover.component
com.adobe.ep.ux.content.view.components.grid.renderers
com.adobe.ep.ux.content.view.components.relationships
com.adobe.ep.ux.content.view.components.review
com.adobe.ep.ux.content.view.components.search.renderers
com.adobe.ep.ux.content.view.components.searchpod
com.adobe.ep.ux.content.view.components.toolbar
com.adobe.ep.ux.content.view.components.toolbar.controlRenderers
com.adobe.ep.ux.content.view.components.version
com.adobe.ep.ux.documentsubmit.component
com.adobe.ep.ux.documentsubmit.domain
com.adobe.ep.ux.documentsubmit.skin
com.adobe.ep.ux.taskaction.component
com.adobe.ep.ux.taskaction.domain
com.adobe.ep.ux.taskaction.domain.events
com.adobe.ep.ux.taskaction.skin
com.adobe.ep.ux.taskdetails.component
com.adobe.ep.ux.taskdetails.domain
com.adobe.ep.ux.taskdetails.skin
com.adobe.ep.ux.tasklist.component
com.adobe.ep.ux.tasklist.domain
com.adobe.ep.ux.tasklist.skin
com.adobe.ep.ux.webdocumentviewer.domain
com.adobe.exm.expression
com.adobe.exm.expression.error
com.adobe.exm.expression.event
com.adobe.exm.expression.impl
com.adobe.fiber.runtime.lib
com.adobe.fiber.services
com.adobe.fiber.services.wrapper
com.adobe.fiber.styles
com.adobe.fiber.util
com.adobe.fiber.valueobjects
com.adobe.gravity.binding
com.adobe.gravity.context
com.adobe.gravity.flex.bundleloader
com.adobe.gravity.flex.progress
com.adobe.gravity.flex.serviceloader
com.adobe.gravity.framework
com.adobe.gravity.init
com.adobe.gravity.service.bundleloader
com.adobe.gravity.service.logging
com.adobe.gravity.service.manifest
com.adobe.gravity.service.progress
com.adobe.gravity.tracker
com.adobe.gravity.ui
com.adobe.gravity.utility
com.adobe.gravity.utility.async
com.adobe.gravity.utility.error
com.adobe.gravity.utility.events
com.adobe.gravity.utility.factory
com.adobe.gravity.utility.flex.async
com.adobe.gravity.utility.logging
com.adobe.gravity.utility.message
com.adobe.gravity.utility.sequence
com.adobe.gravity.utility.url
com.adobe.guides.control
com.adobe.guides.domain
com.adobe.guides.i18n
com.adobe.guides.spark.components.skins
com.adobe.guides.spark.components.skins.mx
com.adobe.guides.spark.headers.components
com.adobe.guides.spark.headers.skins
com.adobe.guides.spark.layouts.components
com.adobe.guides.spark.layouts.skins
com.adobe.guides.spark.navigators.components
com.adobe.guides.spark.navigators.renderers
com.adobe.guides.spark.navigators.skins
com.adobe.guides.spark.util
com.adobe.guides.spark.wrappers.components
com.adobe.guides.spark.wrappers.skins
com.adobe.guides.submit
com.adobe.icc.dc.domain
com.adobe.icc.dc.domain.factory
com.adobe.icc.editors.events
com.adobe.icc.editors.handlers
com.adobe.icc.editors.managers
com.adobe.icc.editors.model
com.adobe.icc.editors.model.config
com.adobe.icc.editors.model.el
com.adobe.icc.editors.model.el.operands
com.adobe.icc.editors.model.el.operators
com.adobe.icc.enum
com.adobe.icc.external.dc
com.adobe.icc.obj
com.adobe.icc.services
com.adobe.icc.services.category
com.adobe.icc.services.config
com.adobe.icc.services.download
com.adobe.icc.services.export
com.adobe.icc.services.external
com.adobe.icc.services.formbridge
com.adobe.icc.services.fragmentlayout
com.adobe.icc.services.layout
com.adobe.icc.services.letter
com.adobe.icc.services.locator
com.adobe.icc.services.module
com.adobe.icc.services.render
com.adobe.icc.services.submit
com.adobe.icc.services.user
com.adobe.icc.token
com.adobe.icc.vo
com.adobe.icc.vo.render
com.adobe.icomm.assetplacement.controller
com.adobe.icomm.assetplacement.controller.utils
com.adobe.icomm.assetplacement.data
com.adobe.icomm.assetplacement.model
com.adobe.livecycle.assetmanager.client
com.adobe.livecycle.assetmanager.client.event
com.adobe.livecycle.assetmanager.client.handler
com.adobe.livecycle.assetmanager.client.managers
com.adobe.livecycle.assetmanager.client.model
com.adobe.livecycle.assetmanager.client.model.cms
com.adobe.livecycle.assetmanager.client.service
com.adobe.livecycle.assetmanager.client.service.search
com.adobe.livecycle.assetmanager.client.service.search.cms
com.adobe.livecycle.assetmanager.client.utils
com.adobe.livecycle.content
com.adobe.livecycle.rca.model
com.adobe.livecycle.rca.model.constant
com.adobe.livecycle.rca.model.document
com.adobe.livecycle.rca.model.participant
com.adobe.livecycle.rca.model.reminder
com.adobe.livecycle.rca.model.stage
com.adobe.livecycle.rca.service
com.adobe.livecycle.rca.service.core
com.adobe.livecycle.rca.service.core.delegate
com.adobe.livecycle.rca.service.process
com.adobe.livecycle.rca.service.process.delegate
com.adobe.livecycle.rca.token
com.adobe.livecycle.ria.security.api
com.adobe.livecycle.ria.security.service
com.adobe.mosaic.layouts
com.adobe.mosaic.layouts.dragAndDrop
com.adobe.mosaic.layouts.interfaces
com.adobe.mosaic.mxml
com.adobe.mosaic.om.constants
com.adobe.mosaic.om.events
com.adobe.mosaic.om.impl
com.adobe.mosaic.om.interfaces
com.adobe.mosaic.skinning
com.adobe.mosaic.sparklib.editors
com.adobe.mosaic.sparklib.optionMenu
com.adobe.mosaic.sparklib.scrollableMenu
com.adobe.mosaic.sparklib.scrollableMenu.skins
com.adobe.mosaic.sparklib.tabLayout
com.adobe.mosaic.sparklib.tabLayout.events
com.adobe.mosaic.sparklib.tabLayout.layouts
com.adobe.mosaic.sparklib.tabLayout.skins
com.adobe.mosaic.sparklib.text
com.adobe.mosaic.sparklib.util
com.adobe.solutions.acm.authoring.presentation
com.adobe.solutions.acm.authoring.presentation.actionbar
com.adobe.solutions.acm.authoring.presentation.common
com.adobe.solutions.acm.authoring.presentation.events
com.adobe.solutions.acm.authoring.presentation.fragment
com.adobe.solutions.acm.authoring.presentation.letter
com.adobe.solutions.acm.authoring.presentation.letter.data
com.adobe.solutions.acm.authoring.presentation.preview
com.adobe.solutions.acm.authoring.presentation.rte
com.adobe.solutions.acm.ccr.presentation
com.adobe.solutions.acm.ccr.presentation.contentcapture
com.adobe.solutions.acm.ccr.presentation.contentcapture.events
com.adobe.solutions.acm.ccr.presentation.contentcapture.preview
com.adobe.solutions.acm.ccr.presentation.datacapture
com.adobe.solutions.acm.ccr.presentation.datacapture.renderers
com.adobe.solutions.acm.ccr.presentation.pdf
com.adobe.solutions.exm
com.adobe.solutions.exm.authoring
com.adobe.solutions.exm.authoring.components.controls
com.adobe.solutions.exm.authoring.components.toolbars
com.adobe.solutions.exm.authoring.domain
com.adobe.solutions.exm.authoring.domain.expression
com.adobe.solutions.exm.authoring.domain.impl
com.adobe.solutions.exm.authoring.domain.method
com.adobe.solutions.exm.authoring.domain.variable
com.adobe.solutions.exm.authoring.enum
com.adobe.solutions.exm.authoring.events
com.adobe.solutions.exm.authoring.model
com.adobe.solutions.exm.authoring.renderer
com.adobe.solutions.exm.authoring.view
com.adobe.solutions.exm.expression
com.adobe.solutions.exm.impl
com.adobe.solutions.exm.impl.method
com.adobe.solutions.exm.method
com.adobe.solutions.exm.mock
com.adobe.solutions.exm.mock.method
com.adobe.solutions.exm.runtime
com.adobe.solutions.exm.runtime.impl
com.adobe.solutions.exm.variable
com.adobe.solutions.prm.constant
com.adobe.solutions.prm.domain
com.adobe.solutions.prm.domain.factory
com.adobe.solutions.prm.domain.impl
com.adobe.solutions.prm.domain.manager
com.adobe.solutions.prm.presentation.asset
com.adobe.solutions.prm.presentation.constant
com.adobe.solutions.prm.presentation.document
com.adobe.solutions.prm.presentation.event
com.adobe.solutions.prm.presentation.file
com.adobe.solutions.prm.presentation.project
com.adobe.solutions.prm.presentation.team
com.adobe.solutions.prm.presentation.util
com.adobe.solutions.prm.service
com.adobe.solutions.prm.services.impl
com.adobe.solutions.prm.vo
com.adobe.solutions.rca.constant
com.adobe.solutions.rca.domain
com.adobe.solutions.rca.domain.common
com.adobe.solutions.rca.domain.factory
com.adobe.solutions.rca.domain.impl
com.adobe.solutions.rca.domain.impl.manager
com.adobe.solutions.rca.domain.manager
com.adobe.solutions.rca.presentation
com.adobe.solutions.rca.presentation.comment
com.adobe.solutions.rca.presentation.constant
com.adobe.solutions.rca.presentation.event
com.adobe.solutions.rca.presentation.gantt
com.adobe.solutions.rca.presentation.gantt.ruler
com.adobe.solutions.rca.presentation.template
com.adobe.solutions.rca.presentation.template.audit
com.adobe.solutions.rca.presentation.template.definition
com.adobe.solutions.rca.presentation.template.documents
com.adobe.solutions.rca.presentation.template.stages
com.adobe.solutions.rca.presentation.util
com.adobe.solutions.rca.service
com.adobe.solutions.rca.services.impl
com.adobe.solutions.rca.vo
com.adobe.solutions.rca.vo.um
com.adobe.viewsource
fl.accessibility
fl.containers
fl.controls
fl.controls.dataGridClasses
fl.controls.listClasses
fl.controls.progressBarClasses
fl.core
fl.data
fl.display
fl.events
fl.ik
fl.lang
fl.livepreview
fl.managers
fl.motion
fl.motion.easing
fl.rsl
fl.text
fl.transitions
fl.transitions.easing
fl.video
flash.accessibility
flash.concurrent
flash.crypto
flash.data
flash.desktop
flash.display
flash.display3D
flash.display3D.textures
flash.errors
flash.events
flash.external
flash.filesystem
flash.filters
flash.geom
flash.globalization
flash.html
flash.media
flash.net
flash.net.dns
flash.net.drm
flash.notifications
flash.permissions
flash.printing
flash.profiler
flash.sampler
flash.security
flash.sensors
flash.system
flash.text
flash.text.engine
flash.text.ime
flash.ui
flash.utils
flash.xml
flashx.textLayout
flashx.textLayout.compose
flashx.textLayout.container
flashx.textLayout.conversion
flashx.textLayout.edit
flashx.textLayout.elements
flashx.textLayout.events
flashx.textLayout.factory
flashx.textLayout.formats
flashx.textLayout.operations
flashx.textLayout.utils
flashx.undo
ga.controls
ga.layouts
ga.model
ga.uiComponents
ga.util
ga.views
ga.wrappers
lc.foundation
lc.foundation.domain
lc.foundation.events
lc.foundation.ui
lc.foundation.util
lc.preloader
lc.procmgmt
lc.procmgmt.commands
lc.procmgmt.domain
lc.procmgmt.events
lc.procmgmt.formbridge
lc.procmgmt.impl
lc.procmgmt.ui.attachments
lc.procmgmt.ui.controls
lc.procmgmt.ui.controls.card
lc.procmgmt.ui.controls.renderer
lc.procmgmt.ui.help
lc.procmgmt.ui.layout
lc.procmgmt.ui.presentationmodel
lc.procmgmt.ui.process
lc.procmgmt.ui.search
lc.procmgmt.ui.startpoint
lc.procmgmt.ui.task
lc.procmgmt.ui.task.form
lc.procmgmt.ui.task.form.commands
lc.procmgmt.ui.tracking
mx.accessibility
mx.automation
mx.automation.air
mx.automation.delegates
mx.automation.delegates.advancedDataGrid
mx.automation.delegates.charts
mx.automation.delegates.containers
mx.automation.delegates.controls
mx.automation.delegates.controls.dataGridClasses
mx.automation.delegates.controls.fileSystemClasses
mx.automation.delegates.core
mx.automation.delegates.flashflexkit
mx.automation.events
mx.binding
mx.binding.utils
mx.charts
mx.charts.chartClasses
mx.charts.effects
mx.charts.effects.effectClasses
mx.charts.events
mx.charts.renderers
mx.charts.series
mx.charts.series.items
mx.charts.series.renderData
mx.charts.styles
mx.collections
mx.collections.errors
mx.containers
mx.containers.accordionClasses
mx.containers.dividedBoxClasses
mx.containers.errors
mx.containers.utilityClasses
mx.controls
mx.controls.advancedDataGridClasses
mx.controls.dataGridClasses
mx.controls.listClasses
mx.controls.menuClasses
mx.controls.olapDataGridClasses
mx.controls.scrollClasses
mx.controls.sliderClasses
mx.controls.textClasses
mx.controls.treeClasses
mx.controls.videoClasses
mx.core
mx.core.windowClasses
mx.data
mx.data.crypto
mx.data.errors
mx.data.events
mx.data.messages
mx.data.mxml
mx.data.offline.errors
mx.data.utils
mx.effects
mx.effects.easing
mx.effects.effectClasses
mx.events
mx.filters
mx.flash
mx.formatters
mx.geom
mx.graphics
mx.graphics.codec
mx.graphics.shaderClasses
mx.logging
mx.logging.errors
mx.logging.targets
mx.managers
mx.messaging
mx.messaging.channels
mx.messaging.config
mx.messaging.errors
mx.messaging.events
mx.messaging.management
mx.messaging.messages
mx.modules
mx.netmon
mx.olap
mx.olap.aggregators
mx.preloaders
mx.printing
mx.resources
mx.rpc
mx.rpc.events
mx.rpc.http
mx.rpc.http.mxml
mx.rpc.livecycle
mx.rpc.mxml
mx.rpc.remoting
mx.rpc.remoting.mxml
mx.rpc.soap
mx.rpc.soap.mxml
mx.rpc.wsdl
mx.rpc.xml
mx.skins
mx.skins.halo
mx.skins.spark
mx.skins.wireframe
mx.skins.wireframe.windowChrome
mx.states
mx.styles
mx.utils
mx.validators
org.osmf.containers
org.osmf.display
org.osmf.elements
org.osmf.events
org.osmf.layout
org.osmf.logging
org.osmf.media
org.osmf.metadata
org.osmf.net
org.osmf.net.dvr
org.osmf.net.httpstreaming
org.osmf.net.metrics
org.osmf.net.qos
org.osmf.net.rtmpstreaming
org.osmf.net.rules
org.osmf.traits
org.osmf.utils
spark.accessibility
spark.automation.delegates
spark.automation.delegates.components
spark.automation.delegates.components.gridClasses
spark.automation.delegates.components.mediaClasses
spark.automation.delegates.components.supportClasses
spark.automation.delegates.skins.spark
spark.automation.events
spark.collections
spark.components
spark.components.calendarClasses
spark.components.gridClasses
spark.components.mediaClasses
spark.components.supportClasses
spark.components.windowClasses
spark.core
spark.effects
spark.effects.animation
spark.effects.easing
spark.effects.interpolation
spark.effects.supportClasses
spark.events
spark.filters
spark.formatters
spark.formatters.supportClasses
spark.globalization
spark.globalization.supportClasses
spark.layouts
spark.layouts.supportClasses
spark.managers
spark.modules
spark.preloaders
spark.primitives
spark.primitives.supportClasses
spark.skins
spark.skins.mobile
spark.skins.mobile.supportClasses
spark.skins.spark
spark.skins.spark.mediaClasses.fullScreen
spark.skins.spark.mediaClasses.normal
spark.skins.spark.windowChrome
spark.skins.wireframe
spark.skins.wireframe.mediaClasses
spark.skins.wireframe.mediaClasses.fullScreen
spark.transitions
spark.utils
spark.validators
spark.validators.supportClasses
xd.core.axm.enterprise.view.components
xd.core.axm.enterprise.view.skins
xd.core.axm.view.components
xd.core.axm.view.components.support

語言元素

全域常數
全域函數
運算子
陳述式、關鍵字和指令
特殊類型

附錄

新增內容
編譯器錯誤
編譯器警告
執行階段錯誤
移轉至 ActionScript 3
支援的字元集
僅限 MXML 標籤
移動 XML 元素
Timed Text 標籤
不建議元素清單
AccessibilityImplementation 常數
如何使用 ActionScript 範例
法律聲明
套件spark.layouts.supportClasses
類別public class LayoutBase
繼承LayoutBase Inheritance OnDemandEventDispatcher Inheritance Object
子類別 BasicLayout, ButtonBarHorizontalLayout, ConstraintLayout, HorizontalLayout, MosaicLayoutBase, TabbedViewNavigatorTabBarHorizontalLayout, TileLayout, VerticalLayout, ViewMenuLayout

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

The LayoutBase class defines the base class for all Spark layouts. To create a custom layout that works with the Spark containers, you must extend LayoutBase or one of its subclasses.

At minimum, subclasses must implement the updateDisplayList() method, which positions and sizes the target GroupBase's elements, and the measure() method, which calculates the default size of the target.

Subclasses may override methods like getElementBoundsAboveScrollRect() and getElementBoundsBelowScrollRect() to customize the way the target behaves when it's connected to scrollbars.

Subclasses that support virtualization must respect the useVirtualLayout property and should only retrieve layout elements within the scrollRect (the value of getScrollRect()) using getVirtualElementAt() from within updateDisplayList().

MXML 語法expanded隱藏 MXML 語法

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

  <s:LayoutBase 
    Properties
    clipAndEnableScrolling="false"
    dropIndicator="defined by the skin class"
    horizontalScrollPosition="0"
    target="null"
    typicalLayoutElement="null"
    useVirtualLayout="false"
    verticalScrollPosition="0"
  />
  


公用屬性
 屬性定義自
  clipAndEnableScrolling : Boolean
If true, specifies to clip the children to the boundaries of the viewport.
LayoutBase
 Inheritedconstructor : Object
類別物件的參照或是特定物件實體的建構函數。
Object
  dropIndicator : DisplayObject
The DisplayObject that this layout uses for the drop indicator during a drag-and-drop operation.
LayoutBase
  horizontalScrollPosition : Number
The x coordinate of the origin of the viewport in the component's coordinate system, where the default value is (0,0) corresponding to the upper-left corner of the component.
LayoutBase
  target : GroupBase
The GroupBase container whose elements are measured, sized and positioned by this layout.
LayoutBase
  typicalLayoutElement : ILayoutElement
Used by layouts when fixed row/column sizes are requested but a specific size isn't specified.
LayoutBase
  useVirtualLayout : Boolean
A container can hold any number of children.
LayoutBase
  verticalScrollPosition : Number
The y coordinate of the origin of the viewport in the component's coordinate system, where the default value is (0,0) corresponding to the upper-left corner of the component.
LayoutBase
公用方法
 方法定義自
  
Constructor.
LayoutBase
 Inherited
addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void
Registers an event listener object with an EventDispatcher object so that the listener receives notification of an event.
OnDemandEventDispatcher
  
Calculates the drop location in the data provider of the drop target for the specified dragEvent.
LayoutBase
  
When useVirtualLayout is true, this method can be used by the layout target to clear cached layout information when the target changes.
LayoutBase
 Inherited
Dispatches an event into the event flow.
OnDemandEventDispatcher
  
Called by the target after a layout element has been added and before the target's size and display list are validated.
LayoutBase
  
This method must is called by the target after a layout element has been removed and before the target's size and display list are validated.
LayoutBase
  
Returns the specified element's layout bounds as a Rectangle or null if the index is invalid, the corresponding element is null, includeInLayout=false, or if this layout's target property is null.
LayoutBase
  
Returns the change to the horizontal scroll position to handle different scrolling options.
LayoutBase
  
getNavigationDestinationIndex(currentIndex:int, navigationUnit:uint, arrowKeysWrapFocus:Boolean):int
Delegation method that determines which item to navigate to based on the current item in focus and user input in terms of NavigationUnit.
LayoutBase
  
Computes the verticalScrollPosition and horizontalScrollPosition deltas needed to scroll the element at the specified index into view.
LayoutBase
  
Returns the change to the vertical scroll position to handle different scrolling options.
LayoutBase
 Inherited
Checks whether the EventDispatcher object has any listeners registered for a specific type of event.
OnDemandEventDispatcher
 Inherited
指出物件是否有已定義的指定屬性。
Object
  
Hides the previously shown drop indicator, created by the showDropIndicator() method, removes it from the display list and also stops the drag scrolling.
LayoutBase
 Inherited
指出 Object 類別的實體是否位於指定為參數的物件原型鏈中。
Object
  
Measures the target's default size based on its content, and optionally measures the target's default minimum size.
LayoutBase
 Inherited
指出指定的屬性是否存在,以及是否可列舉。
Object
 Inherited
removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void
Removes a listener from the EventDispatcher object.
OnDemandEventDispatcher
 Inherited
為迴圈作業設定動態屬性的可用性。
Object
  
Sizes, positions and parents the drop indicator based on the specified drop location.
LayoutBase
 Inherited
傳回代表此物件的字串,根據地區特定慣例進行格式化。
Object
 Inherited
會傳回指定之物件的字串形式。
Object
  
Sizes and positions the target's elements.
LayoutBase
  
Called by the target at the end of its updateDisplayList to have the layout update its scrollRect.
LayoutBase
 Inherited
會傳回指定之物件的基本值。
Object
 Inherited
Checks whether an event listener is registered with this EventDispatcher object or any of its ancestors for the specified event type.
OnDemandEventDispatcher
保護方法
 方法定義自
  
Calculates how much to scroll for the specified dropLocation during a drag and drop gesture.
LayoutBase
  
Returns the index where a new item should be inserted if the user releases the mouse at the specified coordinates while completing a drag and drop gesture.
LayoutBase
  
Calculates the bounds for the drop indicator that provides visual feedback to the user of where the items will be inserted at the end of a drag and drop gesture.
LayoutBase
  
Returns the bounds of the first layout element that either spans or is above the scrollRect's top edge.
LayoutBase
  
Returns the bounds of the first layout element that either spans or is below the scrollRect's bottom edge.
LayoutBase
  
Returns the bounds of the first layout element that either spans or is to the left of the scrollRect's left edge.
LayoutBase
  
Returns the bounds of the first layout element that either spans or is to the right of the scrollRect's right edge.
LayoutBase
  
Returns the bounds of the target's scroll rectangle in layout coordinates.
LayoutBase
  
Called when the verticalScrollPosition or horizontalScrollPosition properties change.
LayoutBase
屬性詳細資訊

clipAndEnableScrolling

屬性
clipAndEnableScrolling:Boolean

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

If true, specifies to clip the children to the boundaries of the viewport. If false, the container children extend past the container boundaries, regardless of the size specification of the component.

預設值為 false。



實作
    public function get clipAndEnableScrolling():Boolean
    public function set clipAndEnableScrolling(value:Boolean):void

dropIndicator

屬性 
dropIndicator:DisplayObject

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

The DisplayObject that this layout uses for the drop indicator during a drag-and-drop operation. Typically you do not set this property directly, but instead define a dropIndicator skin part in the skin class of the drop target.

The List control sets this property in response to a DragEvent.DRAG_ENTER event. The List initializes this property with an instance of its dropIndicator skin part. The List clears this property in response to a DragEvent.DRAG_EXIT event.



實作
    public function get dropIndicator():DisplayObject
    public function set dropIndicator(value:DisplayObject):void

horizontalScrollPosition

屬性 
horizontalScrollPosition:Number

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

The x coordinate of the origin of the viewport in the component's coordinate system, where the default value is (0,0) corresponding to the upper-left corner of the component. If clipAndEnableScrolling is true, setting this property typically causes the viewport to be set to:

      new Rectangle(horizontalScrollPosition, verticalScrollPosition, width, height)
      
Implementations of this property must be Bindable and must generate events of type propertyChange.

預設值為 0。

此屬性可以做為資料繫結的來源。一旦修改此屬性,將傳送 propertyChange 事件。



實作
    public function get horizontalScrollPosition():Number
    public function set horizontalScrollPosition(value:Number):void

target

屬性 
target:GroupBase

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

The GroupBase container whose elements are measured, sized and positioned by this layout.

Subclasses may override the setter to perform target specific actions. For example a 3D layout may set the target's maintainProjectionCenter property here.

預設值為 null。



實作
    public function get target():GroupBase
    public function set target(value:GroupBase):void

相關 API 元素

typicalLayoutElement

屬性 
typicalLayoutElement:ILayoutElement

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Used by layouts when fixed row/column sizes are requested but a specific size isn't specified. Used by virtual layouts to estimate the size of layout elements that have not been scrolled into view.

This property references a component that Flex uses to define the height of all container children, as the following example shows:

      <s:Group>
        <s:layout>
          <s:VerticalLayout variableRowHeight="false"
              typicalLayoutElement="{b3}"/> 
        </s:layout>
        <s:Button id="b1" label="Button 1"/>
        <s:Button id="b2" label="Button 2"/>
        <s:Button id="b3" label="Button 3" fontSize="36"/>
        <s:Button id="b4" label="Button 4" fontSize="24"/>
      </s:Group>

If this property has not been set and the target is non-null then the target's first layout element is cached and returned.

The default value is the target's first layout element.

預設值為 null。



實作
    public function get typicalLayoutElement():ILayoutElement
    public function set typicalLayoutElement(value:ILayoutElement):void

相關 API 元素

useVirtualLayout

屬性 
useVirtualLayout:Boolean

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

A container can hold any number of children. However, each child requires an instance of an item renderer. If the container has many children, you might notice performance degradation as you add more children to the container.

Instead of creating an item renderer for each child, you can configure the container to use a virtual layout. With virtual layout, the container reuses item renderers so that it only creates item renderers for the currently visible children of the container. As a child is moved off the screen, possible by scrolling the container, a new child being scrolled onto the screen can reuse its item renderer.

To configure a container to use virtual layout, set the useVirtualLayout property to true for the layout associated with the container. Only DataGroup or SkinnableDataContainer with layout set to VerticalLayout, HorizontalLayout, or TileLayout supports virtual layout. Layout subclasses that do not support virtualization must prevent changing this property.

Note: The BasicLayout class throws a run-time error if you set useVirtualLayout to true.

When true, layouts that support virtualization must use the target.getVirtualElementAt() method, rather than getElementAt(), and must only get the elements they anticipate will be visible given the value of getScrollRect().

When true, the layout class must be able to compute the indices of the layout elements that overlap the scrollRect in its updateDisplayList() method based exclusively on cached information, not by getting layout elements and examining their bounds.

Typically virtual layouts update their cached information in the updateDisplayList() method, based on the sizes and locations computed for the elements in view.

Similarly, in the measure() method, virtual layouts should update the target's measured size properties based on the typicalLayoutElement and other cached layout information, not by measuring elements.

Containers cooperate with layouts that have useVirtualLayout = true by recycling item renderers that were previously constructed, but are no longer in use. An item is considered to be no longer in use if its index is not within the range of getVirtualElementAt() indices requested during the container's most recent updateDisplayList() invocation.

預設值為 false。



實作
    public function get useVirtualLayout():Boolean
    public function set useVirtualLayout(value:Boolean):void

相關 API 元素

verticalScrollPosition

屬性 
verticalScrollPosition:Number

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

The y coordinate of the origin of the viewport in the component's coordinate system, where the default value is (0,0) corresponding to the upper-left corner of the component. If clipAndEnableScrolling is true, setting this property typically causes the viewport to be set to:

      new Rectangle(horizontalScrollPosition, verticalScrollPosition, width, height)
      
Implementations of this property must be Bindable and must generate events of type propertyChange.

預設值為 0。

此屬性可以做為資料繫結的來源。一旦修改此屬性,將傳送 propertyChange 事件。



實作
    public function get verticalScrollPosition():Number
    public function set verticalScrollPosition(value:Number):void
建構函式詳細資料

LayoutBase

()建構函式
public function LayoutBase()

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Constructor.

方法詳細資訊

calculateDragScrollDelta

()方法
protected function calculateDragScrollDelta(dropLocation:DropLocation, elapsedTime:Number):Point

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Calculates how much to scroll for the specified dropLocation during a drag and drop gesture. Called by the showDropIndicator() method to calculate the scroll during drag-scrolling.

參數

dropLocation:DropLocation — A valid DropLocation object previously obtained by calling the calculateDropLocation() method.
 
elapsedTime:Number — The duration, in milliseconds, since the drag scrolling start.

傳回值
Point — How much to drag scroll, or null if drag-scrolling is not needed.

相關 API 元素

calculateDropIndex

()方法 
protected function calculateDropIndex(x:Number, y:Number):int

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Returns the index where a new item should be inserted if the user releases the mouse at the specified coordinates while completing a drag and drop gesture. Called by the calculatedDropLocation() method.

參數

x:Number — The x coordinate of the drag and drop gesture, in local coordinates.
 
y:Number — The y coordinate of the drag and drop gesture, in the drop target's local coordinates.

傳回值
int — The drop index or -1 if the drop operation is not available at the specified coordinates.

相關 API 元素

calculateDropIndicatorBounds

()方法 
protected function calculateDropIndicatorBounds(dropLocation:DropLocation):Rectangle

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Calculates the bounds for the drop indicator that provides visual feedback to the user of where the items will be inserted at the end of a drag and drop gesture. Called by the showDropIndicator() method.

參數

dropLocation:DropLocation — A valid DropLocation object previously returned by the calculateDropLocation() method.

傳回值
Rectangle — The bounds for the drop indicator or null.

相關 API 元素

calculateDropLocation

()方法 
public function calculateDropLocation(dragEvent:DragEvent):DropLocation

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Calculates the drop location in the data provider of the drop target for the specified dragEvent.

參數

dragEvent:DragEvent — The drag event dispatched by the DragManager.

傳回值
DropLocation — Returns the drop location for this event, or null if the drop operation is not available.

相關 API 元素

clearVirtualLayoutCache

()方法 
public function clearVirtualLayoutCache():void

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

When useVirtualLayout is true, this method can be used by the layout target to clear cached layout information when the target changes.

For example, when a DataGroup's dataProvider or itemRenderer property changes, cached elements sizes become invalid.

When the useVirtualLayout property changes to false, this method is called automatically.

Subclasses that support useVirtualLayout = true must override this method.

elementAdded

()方法 
public function elementAdded(index:int):void

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Called by the target after a layout element has been added and before the target's size and display list are validated. Layouts that cache per element state, like virtual layouts, can override this method to update their cache.

If the target calls this method, it's only guaranteeing that a a layout element will exist at the specified index at updateDisplayList() time, for example a DataGroup with a virtual layout will call this method when an item is added to the targets dataProvider.

By default, this method does nothing.

參數

index:int — The index of the element that was added.

相關 API 元素

elementRemoved

()方法 
public function elementRemoved(index:int):void

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

This method must is called by the target after a layout element has been removed and before the target's size and display list are validated. Layouts that cache per element state, like virtual layouts, can override this method to update their cache.

If the target calls this method, it's only guaranteeing that a a layout element will no longer exist at the specified index at updateDisplayList() time. For example, a DataGroup with a virtual layout calls this method when an item is added to the dataProvider property.

By default, this method does nothing.

參數

index:int — The index of the element that was added.

相關 API 元素

getElementBounds

()方法 
public function getElementBounds(index:int):Rectangle

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Returns the specified element's layout bounds as a Rectangle or null if the index is invalid, the corresponding element is null, includeInLayout=false, or if this layout's target property is null.

Layout subclasses that support useVirtualLayout=true must override this method to compute a potentially approximate value for elements that are not in view.

參數

index:int — Index of the layout element.

傳回值
Rectangle — The specified element's layout bounds.

相關 API 元素

getElementBoundsAboveScrollRect

()方法 
protected function getElementBoundsAboveScrollRect(scrollRect:Rectangle):Rectangle

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Returns the bounds of the first layout element that either spans or is above the scrollRect's top edge.

This is a convenience method that is used by the default implementation of the getVerticalScrollPositionDelta() method. Subclasses that rely on the default implementation of getVerticalScrollPositionDelta() should override this method to provide an accurate bounding rectangle that has valid top and bottom properties.

By default this method returns a Rectangle with width=0, height=1, whose top edge is one less than the top edge of the scrollRect, and left=0.

Subclasses should override this method to provide an accurate bounding rectangle that has valid top and bottom properties.

參數

scrollRect:Rectangle — The target's scrollRect.

傳回值
Rectangle — The bounds of the first element that spans or is above the scrollRect's top edge.

相關 API 元素

getElementBoundsBelowScrollRect

()方法 
protected function getElementBoundsBelowScrollRect(scrollRect:Rectangle):Rectangle

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Returns the bounds of the first layout element that either spans or is below the scrollRect's bottom edge.

This is a convenience method that is used by the default implementation of the getVerticalScrollPositionDelta() method. Subclasses that rely on the default implementation of getVerticalScrollPositionDelta() should override this method to provide an accurate bounding rectangle that has valid top and bottom properties.

By default this method returns a Rectangle with width=0, height=1, whose bottom edge is one more than the bottom edge of the scrollRect, and left=0.

參數

scrollRect:Rectangle — The target's scrollRect.

傳回值
Rectangle — The bounds of the first element that spans or is below the scrollRect's bottom edge.

相關 API 元素

getElementBoundsLeftOfScrollRect

()方法 
protected function getElementBoundsLeftOfScrollRect(scrollRect:Rectangle):Rectangle

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Returns the bounds of the first layout element that either spans or is to the left of the scrollRect's left edge.

This is a convenience method that is used by the default implementation of the getHorizontalScrollPositionDelta() method. Subclasses that rely on the default implementation of getHorizontalScrollPositionDelta() should override this method to provide an accurate bounding rectangle that has valid left and right properties.

By default this method returns a Rectangle with width=1, height=0, whose left edge is one less than the left edge of the scrollRect, and top=0.

參數

scrollRect:Rectangle — The target's scrollRect.

傳回值
Rectangle — The bounds of the first element that spans or is to the left of the scrollRect's left edge.

相關 API 元素

getElementBoundsRightOfScrollRect

()方法 
protected function getElementBoundsRightOfScrollRect(scrollRect:Rectangle):Rectangle

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Returns the bounds of the first layout element that either spans or is to the right of the scrollRect's right edge.

This is a convenience method that is used by the default implementation of the getHorizontalScrollPositionDelta() method. Subclasses that rely on the default implementation of getHorizontalScrollPositionDelta() should override this method to provide an accurate bounding rectangle that has valid left and right properties.

By default this method returns a Rectangle with width=1, height=0, whose right edge is one more than the right edge of the scrollRect, and top=0.

參數

scrollRect:Rectangle — The target's scrollRect.

傳回值
Rectangle — The bounds of the first element that spans or is to the right of the scrollRect's right edge.

相關 API 元素

getHorizontalScrollPositionDelta

()方法 
public function getHorizontalScrollPositionDelta(navigationUnit:uint):Number

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Returns the change to the horizontal scroll position to handle different scrolling options. These options are defined by the NavigationUnit class: END, HOME, LEFT, PAGE_LEFT, PAGE_RIGHT, and RIGHT.

參數

navigationUnit:uint — Takes the following values:
  • END Returns scroll delta that will right justify the scrollRect to the content area.
  • HOME Returns scroll delta that will left justify the scrollRect to the content area.
  • LEFT Returns scroll delta that will left justify the scrollRect with the first element that spans or is to the left of the scrollRect's left edge.
  • PAGE_LEFT Returns scroll delta that will right justify the scrollRect with the first element that spans or is to the left of the scrollRect's left edge.
  • PAGE_RIGHT Returns scroll delta that will left justify the scrollRect with the first element that spans or is to the right of the scrollRect's right edge.
  • RIGHT Returns scroll delta that will right justify the scrollRect with the first element that spans or is to the right of the scrollRect's right edge.

The implementation calls getElementBoundsLeftOfScrollRect() and getElementBoundsRightOfScrollRect() to determine the bounds of the elements. Layout classes usually override those methods instead of the getHorizontalScrollPositionDelta() method.

傳回值
Number — The change to the horizontal scroll position.

相關 API 元素

getNavigationDestinationIndex

()方法 
public function getNavigationDestinationIndex(currentIndex:int, navigationUnit:uint, arrowKeysWrapFocus:Boolean):int

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Delegation method that determines which item to navigate to based on the current item in focus and user input in terms of NavigationUnit. This method is used by subclasses of ListBase to handle keyboard navigation. ListBase maps user input to NavigationUnit constants.

Subclasses can override this method to compute other values that are based on the current index and key stroke encountered.

參數

currentIndex:int — The current index of the item with focus.
 
navigationUnit:uint — The NavigationUnit constant that determines which item to navigate to next.
 
arrowKeysWrapFocus:Boolean — If true, using arrow keys to navigate within the component wraps when it hits either end.

傳回值
int — The index of the next item to jump to. Returns -1 when if the layout doesn't recognize the navigationUnit.

getScrollPositionDeltaToElement

()方法 
public function getScrollPositionDeltaToElement(index:int):Point

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Computes the verticalScrollPosition and horizontalScrollPosition deltas needed to scroll the element at the specified index into view.

This method attempts to minimize the change to verticalScrollPosition and horizontalScrollPosition.

If clipAndEnableScrolling is true and the element at the specified index is not entirely visible relative to the target's scroll rectangle, then return the delta to be added to horizontalScrollPosition and verticalScrollPosition that scrolls the element completely within the scroll rectangle's bounds.

參數

index:int — The index of the element to be scrolled into view.

傳回值
Point — A Point that contains offsets to horizontalScrollPosition and verticalScrollPosition that will scroll the specified element into view, or null if no change is needed. If the specified element is partially visible and larger than the scroll rectangle, meaning it is already the only element visible, then return null. If the specified index is invalid, or target is null, then return null. If the element at the specified index is null or includeInLayout false, then return null.

相關 API 元素

getScrollRect

()方法 
protected function getScrollRect():Rectangle

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Returns the bounds of the target's scroll rectangle in layout coordinates. Layout methods should not get the target's scroll rectangle directly.

傳回值
Rectangle — The bounds of the target's scrollRect in layout coordinates, null if target or clipAndEnableScrolling is false.

getVerticalScrollPositionDelta

()方法 
public function getVerticalScrollPositionDelta(navigationUnit:uint):Number

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Returns the change to the vertical scroll position to handle different scrolling options. These options are defined by the NavigationUnit class: DOWN, END, HOME, PAGE_DOWN, PAGE_UP, and UP.

參數

navigationUnit:uint — Takes the following values:
  • DOWN Returns scroll delta that will bottom justify the scrollRect with the first element that spans or is below the scrollRect's bottom edge.
  • END Returns scroll delta that will bottom justify the scrollRect to the content area.
  • HOME Returns scroll delta that will top justify the scrollRect to the content area.
  • PAGE_DOWN Returns scroll delta that will top justify the scrollRect with the first element that spans or is below the scrollRect's bottom edge.
  • PAGE_UP
  • Returns scroll delta that will bottom justify the scrollRect with the first element that spans or is above the scrollRect's top edge.
  • UP Returns scroll delta that will top justify the scrollRect with the first element that spans or is above the scrollRect's top edge.

The implementation calls getElementBoundsAboveScrollRect() and getElementBoundsBelowScrollRect() to determine the bounds of the elements. Layout classes usually override those methods instead of the getVerticalScrollPositionDelta() method.

傳回值
Number — The change to the vertical scroll position.

相關 API 元素

hideDropIndicator

()方法 
public function hideDropIndicator():void

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Hides the previously shown drop indicator, created by the showDropIndicator() method, removes it from the display list and also stops the drag scrolling.

相關 API 元素

measure

()方法 
public function measure():void

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Measures the target's default size based on its content, and optionally measures the target's default minimum size.

This is one of the methods that you must override when creating a subclass of LayoutBase. The other method is updateDisplayList(). You do not call these methods directly. Flex calls this method as part of a layout pass. A layout pass consists of three phases.

First, if the target's properties are invalid, the LayoutManager calls the target's commitProperties method.

Second, if the target's size is invalid, LayoutManager calls the target's validateSize() method. The target's validateSize() will in turn call the layout's measure() to calculate the target's default size unless it was explicitly specified by both target's explicitWidth and explicitHeight properties. If the default size changes, Flex will invalidate the target's display list.

Last, if the target's display list is invalid, LayoutManager calls the target's validateDisplayList. The target's validateDisplayList will in turn call the layout's updateDisplayList method to size and position the target's elements.

When implementing this method, you must set the target's measuredWidth and measuredHeight properties to define the target's default size. You may optionally set the measuredMinWidth and measuredMinHeight properties to define the default minimum size. A typical implementation iterates through the target's elements and uses the methods defined by the ILayoutElement to accumulate the preferred and/or minimum sizes of the elements and then sets the target's measuredWidth, measuredHeight, measuredMinWidth and measuredMinHeight.

相關 API 元素

scrollPositionChanged

()方法 
protected function scrollPositionChanged():void

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Called when the verticalScrollPosition or horizontalScrollPosition properties change.

The default implementation updates the target's scrollRect property by calling updateScrollRect(). Subclasses can override this method to compute other values that are based on the current scrollPosition or scrollRect.

相關 API 元素

showDropIndicator

()方法 
public function showDropIndicator(dropLocation:DropLocation):void

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Sizes, positions and parents the drop indicator based on the specified drop location. Use the calculateDropLocation() method to obtain the DropLocation object.

Starts/stops drag-scrolling when necessary conditions are met.

參數

dropLocation:DropLocation — Specifies the location where to show the drop indicator. Drop location is obtained through the computeDropLocation() method.

相關 API 元素

updateDisplayList

()方法 
public function updateDisplayList(width:Number, height:Number):void

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Sizes and positions the target's elements.

This is one of the methods that you must override when creating a subclass of LayoutBase. The other method is measure(). You do not call these methods directly. Flex calls this method as part of a layout pass. A layout pass consists of three phases.

First, if the target's properties are invalid, the LayoutManager calls the target's commitProperties method.

Second, if the target's size is invalid, LayoutManager calls the target's validateSize() method. The target's validateSize() will in turn call the layout's measure() to calculate the target's default size unless it was explicitly specified by both target's explicitWidth and explicitHeight properties. If the default size changes, Flex will invalidate the target's display list.

Last, if the target's display list is invalid, LayoutManager calls the target's validateDisplayList. The target's validateDisplayList will in turn call the layout's updateDisplayList method to size and position the target's elements.

A typical implementation iterates through the target's elements and uses the methods defined by the ILayoutElement to position and resize the elements. Then the layout must also calculate and set the target's contentWidth and contentHeight properties to define the target's scrolling region.

參數

width:Number — Specifies the width of the target, in pixels, in the targets's coordinates.
 
height:Number — Specifies the height of the component, in pixels, in the target's coordinates.

相關 API 元素

updateScrollRect

()方法 
public function updateScrollRect(w:Number, h:Number):void

語言版本: ActionScript 3.0
產品版本: Flex 4
執行階段版本: Flash Player 10, AIR 1.5

Called by the target at the end of its updateDisplayList to have the layout update its scrollRect.

If clipAndEnableScrolling is true, the default implementation sets the origin of the target's scrollRect to verticalScrollPosition, horizontalScrollPosition. It sets its size to the width, height parameters (the target's unscaled width and height).

If clipAndEnableScrolling is false, the default implementation sets the scrollRect to null.

參數

w:Number — The target's width.
 
h:Number — The target's height.

相關 API 元素





[ X ]為什麼顯示英文?
「ActionScript 3.0 參考」的內容是以英文顯示

並非所有「ActionScript 3.0 參考」的內容都翻譯為所有語言。當語言元素未翻譯時,就會以英文顯示。例如,ga.controls.HelpBox 類別並沒有翻譯為任何語言。因此在參考的繁體中文版本中,ga.controls.HelpBox 類別就會以英文顯示。