| Appendixes | Conventions | Frames
| Package | mx.controls |
| Class | public class Tree |
| Inheritance | Tree  List ListBase ScrollControlBase UIComponent FlexSprite Sprite DisplayObjectContainer InteractiveObject DisplayObject EventDispatcher Object |
| Implements | IIMESupport |
| Subclasses | FileSystemTree |
By default, a leaf is represented by a text label next to a file icon. A branch is represented by a text label next to a folder icon, with a disclosure triangle that a user can open to expose children.
The Tree class uses an ITreeDataDescriptor or ITreeDataDescriptor2 object to parse and
manipulate the data provider.
The default tree data descriptor, an object of the DefaultDataDescriptor class,
supports XML and Object classes; an Object class data provider must have all children
in children fields.
The Tree control has the following default sizing characteristics:
| Characteristic | Description |
|---|---|
| Default size | Wide enough to accommodate the icon, label, and expansion triangle, if any, of the widest node in the first 7 displayed (uncollapsed) rows, and seven rows high, where each row is 20 pixels in height. If a scroll bar is required, the width of the scroll bar is not included in the width calculations. |
| Minimum size | 0 pixels. |
| Maximum size | 5000 by 5000. |
Hide MXML Syntax
The <mx:Tree> tag inherits all the tag attributes of its superclass, and adds the following tag attributes:
Show MXML Syntax
<mx:Tree
Properties
dataDescriptor="Instance of DefaultDataDescriptor"
dataProvider="null"
dragMoveEnabled="true|false"
firstVisibleItem="First item in the control"
hasRoot="false|true"
itemIcons="null"
maxHorizontalScrollPosition="0"
openItems="null"
showRoot="true|false"
Styles
alternatingItemColors="undefined"
backgroundDisabledColor="0xDDDDDD"
defaultLeafIcon="TreeNodeIcon in assets.swf"
depthColors="undefined"
disclosureClosedIcon="TreeDisclosureClosed in assets.swf"
disclosureOpenIcon="TreeDisclosureOpen in assets.swf"
folderClosedIcon="TreeFolderClosed in assets.swf"
folderOpenIcon="TreeFolderOpen in assets.swf"
indentation="17"
openDuration="250"
openEasingFunction="undefined"
paddingLeft="2"
paddingRight="0"
rollOverColor="0xAADEFF"
selectionColor="0x7FCDFE"
selectionDisabledColor="0xDDDDDD"
selectionEasingFunction="undefined"
textRollOverColor="0x2B333C"
textSelectedColor="0x2B333C"
Events
change="No default"
itemClose="No default"
itemOpen="No default"
itemOpening="No default"
/>
Default MXML PropertydataProvider
See also
| Property | Defined By | ||
|---|---|---|---|
 | accessibilityProperties : AccessibilityProperties
The current accessibility options for this display object.
| DisplayObject | |
| activeEffects : Array
[read-only]
The list of effects that are currently playing on the component,
as an Array of EffectInstance instances.
| UIComponent | |
| allowDragSelection : Boolean = false
A flag that indicates whether drag-selection is enabled.
| ListBase | |
| allowMultipleSelection : Boolean
A flag that indicates whether you can allow more than one item to be
selected at the same time.
| ListBase | |
| alpha : Number
Indicates the alpha transparency value of the object specified.
| DisplayObject | |
| automationDelegate : Object
The delegate object that handles the automation-related functionality.
| UIComponent | |
| automationName : String
Name that can be used as an identifier for this object.
| UIComponent | |
| automationTabularData : Object
[read-only]
An implementation of the IAutomationTabularData interface, which
can be used to retrieve the data.
| UIComponent | |
| automationValue : Array
[read-only]
This value generally corresponds to the rendered appearance of the
object and should be usable for correlating the identifier with
the object as it appears visually within the application.
| UIComponent | |
| baselinePosition : Number
[read-only]
The y-coordinate of the baseline
of the first line of text of the component.
| UIComponent | |
| blendMode : String
A value from the BlendMode class that specifies which blend mode to use.
| DisplayObject | |
| borderMetrics : EdgeMetrics
[read-only]
Returns an EdgeMetrics object that has four properties:
left, top, right,
and bottom.
| ScrollControlBase | |
| buttonMode : Boolean
Specifies the button mode of this sprite.
| Sprite | |
| cacheAsBitmap : Boolean
If set to true, Flash Player or Adobe AIR caches an internal bitmap representation of the
display object.
| DisplayObject | |
| cacheHeuristic : Boolean
[write-only]
Used by Flex to suggest bitmap caching for the object.
| UIComponent | |
| cachePolicy : String
Specifies the bitmap caching policy for this object.
| UIComponent | |
| className : String
[read-only]
The name of this instance's class, such as "Button".
| UIComponent | |
| columnCount : int
The number of columns to be displayed in a TileList control or items
in a HorizontalList control.
| ListBase | |
| columnWidth : Number
The width of the control's columns.
| ListBase | |
| constructor : Object
A reference to the class object or constructor function for a given object instance.
| Object | |
| contentMouseX : Number
[read-only]
Returns the x position of the mouse, in the content coordinate system.
| UIComponent | |
| contentMouseY : Number
[read-only]
Returns the y position of the mouse, in the content coordinate system.
| UIComponent | |
| contextMenu : NativeMenu
Specifies the context menu associated with this object.
| InteractiveObject | |
| currentState : String
The current view state of the component.
| UIComponent | |
| cursorManager : ICursorManager [read-only]
Gets the CursorManager that controls the cursor for this component
and its peers.
| UIComponent | |
| data : Object
The item in the data provider this component should render when
this component is used as an item renderer or item editor.
| ListBase | |
| dataDescriptor : ITreeDataDescriptor
Tree delegates to the data descriptor for information about the data.
| Tree | ||
| dataProvider : Object
An object that contains the data to be displayed.
| Tree | ||
| dataTipField : String
Name of the field in the data provider items to display as the
data tip.
| ListBase | |
| dataTipFunction : Function
User-supplied function to run on each item to determine its dataTip.
| ListBase | |
| descriptor : UIComponentDescriptor
Reference to the UIComponentDescriptor, if any, that was used
by the createComponentFromDescriptor() method to create this
UIComponent instance.
| UIComponent | |
| document : Object
A reference to the document object associated with this UIComponent.
| UIComponent | |
| doubleClickEnabled : Boolean
Specifies whether the UIComponent object receives doubleClick events.
| UIComponent | |
| dragEnabled : Boolean
A flag that indicates whether you can drag items out of
this control and drop them on other controls.
| ListBase | |
| dragMoveEnabled : Boolean
Indicates that items can be moved instead of just copied
from the Tree control as part of a drag-and-drop operation.
| Tree | ||
| dropEnabled : Boolean
A flag that indicates whether dragged items can be dropped onto the
control.
| ListBase | |
| dropTarget : DisplayObject
[read-only]
Specifies the display object over which the sprite is being dragged, or on
which the sprite was dropped.
| Sprite | |
| editable : Boolean = false
A flag that indicates whether or not the user can edit
items in the data provider.
| List | |
| editedItemPosition : Object
The column and row index of the item renderer for the
data provider item being edited, if any.
| List | |
| editedItemRenderer : IListItemRenderer
[read-only]
A reference to the item renderer
in the DataGrid control whose item is currently being edited.
| List | |
| editorDataField : String = "text"
The name of the property of the item editor that contains the new
data for the list item.
| List | |
| editorHeightOffset : Number = 0
The height of the item editor, in pixels, relative to the size of the
item renderer.
| List | |
| editorUsesEnterKey : Boolean = false
A flag that indicates whether the item editor uses Enter key.
| List | |
| editorWidthOffset : Number = 0
The width of the item editor, in pixels, relative to the size of the
item renderer.
| List | |
| editorXOffset : Number = 0
The x location of the upper-left corner of the item editor,
in pixels, relative to the upper-left corner of the item.
| List | |
| editorYOffset : Number = 0
The y location of the upper-left corner of the item editor,
in pixels, relative to the upper-left corner of the item.
| List | |
| enabled : Boolean
Whether the component can accept user interaction.
| UIComponent | |
| errorString : String
The text that will be displayed by a component's error tip when a
component is monitored by a Validator and validation fails.
| UIComponent | |
| explicitHeight : Number
Number that specifies the explicit height of the component,
in pixels, in the component's coordinates.
| UIComponent | |
| explicitMaxHeight : Number
Number that specifies the maximum height of the component,
in pixels, in the component's coordinates.
| UIComponent | |
| explicitMaxWidth : Number
Number that specifies the maximum width of the component,
in pixels, in the component's coordinates.
| UIComponent | |
| explicitMinHeight : Number
Number that specifies the minimum height of the component,
in pixels, in the component's coordinates.
| UIComponent | |
| explicitMinWidth : Number
Number that specifies the minimum width of the component,
in pixels, in the component's coordinates.
| UIComponent | |
| explicitWidth : Number
Number that specifies the explicit width of the component,
in pixels, in the component's coordinates.
| UIComponent | |
| filters : Array
An indexed array that contains each filter object currently associated with the display object.
| DisplayObject | |
| firstVisibleItem : Object
The item that is currently displayed in the top row of the tree.
| Tree | ||
| flexContextMenu : IFlexContextMenu
The context menu for this UIComponent.
| UIComponent | |
| focusEnabled : Boolean
Indicates whether the component can receive focus when tabbed to.
| UIComponent | |
| focusManager : IFocusManager
Gets the FocusManager that controls focus for this component
and its peers.
| UIComponent | |
| focusPane : Sprite
The focus pane associated with this object.
| UIComponent | |
| focusRect : Object
Specifies whether this object displays a focus rectangle.
| InteractiveObject | |
| graphics : Graphics
[read-only]
Specifies the Graphics object that belongs to this sprite where vector
drawing commands can occur.
| Sprite | |
| hasRoot : Boolean
[read-only]
Indicates that the current dataProvider has a root item; for example,
a single top node in a hierarchical structure.
| Tree | ||
| height : Number
Number that specifies the height of the component, in pixels,
in the parent's coordinates.
| UIComponent | |
| hitArea : Sprite
Designates another sprite to serve as the hit area for a sprite.
| Sprite | |
| horizontalScrollPolicy : String
A property that indicates whether the horizontal scroll
bar is always on, always off,
or automatically changes based on the parameters passed to the
setScrollBarProperties() method.
| ScrollControlBase | |
| horizontalScrollPosition : Number
The offset into the content from the left edge.
| ScrollControlBase | |
| iconField : String
The name of the field in the data provider object that determines what to
display as the icon.
| ListBase | |
| iconFunction : Function
A user-supplied function to run on each item to determine its icon.
| ListBase | |
| id : String
ID of the component.
| UIComponent | |
| imeMode : String
Specifies the IME (input method editor) mode.
| List | |
| includeInLayout : Boolean
Specifies whether this component is included in the layout of the
parent container.
| UIComponent | |
| inheritingStyles : Object
The beginning of this component's chain of inheriting styles.
| UIComponent | |
| initialized : Boolean
A flag that determines if an object has been through all three phases
of layout: commitment, measurement, and layout (provided that any were required).
| UIComponent | |
| instanceIndex : int
[read-only]
The index of a repeated component.
| UIComponent | |
| instanceIndices : Array
An Array containing the indices required to reference
this UIComponent object from its parent document.
| UIComponent | |
| isDocument : Boolean
[read-only]
Determines whether this UIComponent instance is a document object,
that is, whether it is at the top of the hierarchy of a Flex
application, MXML component, or ActionScript component.
| UIComponent | |
| isPopUp : Boolean
Set to true by the PopUpManager to indicate
that component has been popped up.
| UIComponent | |
| itemEditor : IFactory
The class factory for the item editor to use for the control, if the
editable property is set to true.
| List | |
| itemEditorInstance : IListItemRenderer
A reference to the currently active instance of the item editor,
if it exists.
| List | |
| itemIcons : Object
An object that specifies the icons for the items.
| Tree | ||
| itemRenderer : IFactory
The custom item renderer for the control.
| ListBase | |
| labelField : String
The name of the field in the data provider items to display as the label.
| ListBase | |
| labelFunction : Function
A user-supplied function to run on each item to determine its label.
| ListBase | |
| listData : BaseListData
When a component is used as a drop-in item renderer or drop-in
item editor, Flex initializes the listData property
of the component with the additional data from the list control.
| ListBase | |
| liveScrolling : Boolean = true
A flag that indicates whether scrolling is live as the
scrollbar thumb is moved
or the view is not updated until the thumb is released.
| ScrollControlBase | |
| loaderInfo : LoaderInfo
[read-only]
Returns a LoaderInfo object containing information about loading the file
to which this display object belongs.
| DisplayObject | |
| mask : DisplayObject
The calling display object is masked by the specified mask object.
| DisplayObject | |
| maxHeight : Number
Number that specifies the maximum height of the component,
in pixels, in the component's coordinates.
| UIComponent | |
| maxHorizontalScrollPosition : Number
The maximum value for the maxHorizontalScrollPosition property for the Tree control.
| Tree | ||
| maxVerticalScrollPosition : Number
The maximum value for the verticalScrollPosition property.
| ScrollControlBase | |
| maxWidth : Number
Number that specifies the maximum width of the component,
in pixels, in the component's coordinates.
| UIComponent | |
| measuredHeight : Number
The default height of the component, in pixels.
| UIComponent | |
| measuredMinHeight : Number
The default minimum height of the component, in pixels.
| UIComponent | |
| measuredMinWidth : Number
The default minimum width of the component, in pixels.
| UIComponent | |
| measuredWidth : Number
The default width of the component, in pixels.
| UIComponent | |
| menuSelectionMode : Boolean = false
A flag that indicates whether menu-style selection
should be used.
| ListBase | |
| minHeight : Number
Number that specifies the minimum height of the component,
in pixels, in the component's coordinates.
| UIComponent | |
| minWidth : Number
Number that specifies the minimum width of the component,
in pixels, in the component's coordinates.
| UIComponent | |
| moduleFactory : IFlexModuleFactory
The moduleFactory that is used to create TextFields in the correct SWF context.
| UIComponent | |
| mouseChildren : Boolean
Determines whether or not the children of the object are mouse enabled.
| DisplayObjectContainer | |
| mouseEnabled : Boolean
Specifies whether this object receives mouse messages.
| InteractiveObject | |
| mouseFocusEnabled : Boolean
Whether you can receive focus when clicked on.
| UIComponent | |
| mouseX : Number
[read-only]
Indicates the x coordinate of the mouse position, in pixels.
| DisplayObject | |
| mouseY : Number
[read-only]
Indicates the y coordinate of the mouse position, in pixels.
| DisplayObject | |
| name : String
Indicates the instance name of the DisplayObject.
| DisplayObject | |
| nestLevel : int
Depth of this object in the containment hierarchy.
| UIComponent | |
| nonInheritingStyles : Object
The beginning of this component's chain of non-inheriting styles.
| UIComponent | |
| nullItemRenderer : IFactory
The custom item renderer for the control.
| ListBase | |
| numAutomationChildren : int
[read-only]
The number of automation children this container has.
| UIComponent | |
| numChildren : int
[read-only]
Returns the number of children of this object.
| DisplayObjectContainer | |
| offscreenExtraRowsOrColumns : int
The target number of extra rows or columns of item renderers to be used
in the layout of the control.
| ListBase | |
| opaqueBackground : Object
Specifies whether the display object is opaque with a certain background color.
| DisplayObject | |
| openItems : Object
The items that have been opened or set opened.
| Tree | ||
| owner : DisplayObjectContainer
The owner of this UIComponent.
| UIComponent | |
| parent : DisplayObjectContainer
[read-only]
The parent container or component for this component.
| UIComponent | |
| parentApplication : Object
[read-only]
A reference to the Application object that contains this UIComponent
instance.
| UIComponent | |
| parentDocument : Object
[read-only]
A reference to the parent document object for this UIComponent.
| UIComponent | |
| percentHeight : Number
Number that specifies the height of a component as a percentage
of its parent's size.
| UIComponent | |
| percentWidth : Number
Number that specifies the width of a component as a percentage
of its parent's size.
| UIComponent | |
| processedDescriptors : Boolean
Set to true after immediate or deferred child creation,
depending on which one happens.
| UIComponent | |
| prototype : Object
[static]
A reference to the prototype object of a class or function object.
| Object | |
| rendererIsEditor : Boolean = false
Specifies whether the item renderer is also an item
editor.
| List | |
| repeater : IRepeater
[read-only]
A reference to the Repeater object
in the parent document that produced this UIComponent.
| UIComponent | |
| repeaterIndex : int
[read-only]
The index of the item in the data provider
of the Repeater that produced this UIComponent.
| UIComponent | |
| repeaterIndices : Array
An Array containing the indices of the items in the data provider
of the Repeaters in the parent document that produced this UIComponent.
| UIComponent | |
| repeaters : Array
An Array containing references to the Repeater objects
in the parent document that produced this UIComponent.
| UIComponent | |
| root : DisplayObject
[read-only]
For a display object in a loaded SWF file, the root property is the
top-most display object in the portion of the display list's tree structure represented by that SWF file.
| DisplayObject | |
| rotation : Number
Indicates the rotation of the DisplayObject instance, in degrees, from its original orientation.
| DisplayObject | |
| rowCount : int
Number of rows to be displayed.
| ListBase | |
| rowHeight : Number
The height of the rows in pixels.
| ListBase | |
| scale9Grid : Rectangle
The current scaling grid that is in effect.
| DisplayObject | |
| scaleX : Number
Number that specifies the horizontal scaling factor.
| UIComponent | |
| scaleY : Number
Number that specifies the vertical scaling factor.
| UIComponent | |
| screen : Rectangle
[read-only]
Returns an object that contains the size and position of the base
drawing surface for this object.
| UIComponent | |
| scrollRect : Rectangle
The scroll rectangle bounds of the display object.
| DisplayObject | |
| scrollTipFunction : Function
A function that computes the string to be displayed as the ScrollTip.
| ScrollControlBase | |
| selectable : Boolean
A flag that indicates whether the list shows selected items
as selected.
| ListBase | |
| selectedIndex : int
The index in the data provider of the selected item.
| ListBase | |
| selectedIndices : Array
An array of indices in the data provider of the selected items.
| ListBase | |
| selectedItem : Object
A reference to the selected item in the data provider.
| ListBase | |
| selectedItems : Array
An array of references to the selected items in the data provider.
| ListBase | |
| showDataTips : Boolean
A flag that indicates whether dataTips are displayed for text in the rows.
| ListBase | |
| showInAutomationHierarchy : Boolean
A flag that determines if an automation object
shows in the automation hierarchy.
| UIComponent | |
| showRoot : Boolean
Sets the visibility of the root item.
| Tree | ||
| showScrollTips : Boolean = false
A flag that indicates whether a tooltip should appear
near the scroll thumb when it is being dragged.
| ScrollControlBase | |
| soundTransform : SoundTransform
Controls sound within this sprite.
| Sprite | |
| stage : Stage
[read-only]
The Stage of the display object.
| DisplayObject | |
| states : Array
The view states that are defined for this component.
| UIComponent | |
| styleDeclaration : CSSStyleDeclaration
Storage for the inline inheriting styles on this object.
| UIComponent | |
| styleName : Object
The class style used by this component.
| UIComponent | |
| systemManager : ISystemManager
Returns the SystemManager object used by this component.
| UIComponent | |
| tabChildren : Boolean
Determines whether the children of the object are tab enabled.
| DisplayObjectContainer | |
| tabEnabled : Boolean
Specifies whether this object is in the tab order.
| InteractiveObject | |
| tabIndex : int
Specifies the tab ordering of objects in a SWF file.
| InteractiveObject | |
| textSnapshot : TextSnapshot
[read-only]
Returns a TextSnapshot object for this DisplayObjectContainer instance.
| DisplayObjectContainer | |
| toolTip : String
Text to display in the ToolTip.
| UIComponent | |
| transform : Transform
An object with properties pertaining to a display object's matrix, color transform, and pixel bounds.
| DisplayObject | |
| transitions : Array
An Array of Transition objects, where each Transition object defines a
set of effects to play when a view state change occurs.
| UIComponent | |
| tweeningProperties : Array
Array of properties that are currently being tweened on this object.
| UIComponent | |
| uid : String
A unique identifier for the object.
| UIComponent | |
| updateCompletePendingFlag : Boolean
A flag that determines if an object has been through all three phases
of layout validation (provided that any were required).
| UIComponent | |
| useHandCursor : Boolean
A Boolean value that indicates whether the pointing hand (hand cursor) appears when the mouse rolls
over a sprite in which the buttonMode property is set to true.
| Sprite | |
| validationSubField : String
Used by a validator to associate a subfield with this component.
| UIComponent | |
| value : Object
[read-only]
The selected item, or the data or label field of the selected item.
| ListBase | |
| variableRowHeight : Boolean
A flag that indicates whether the individual rows can have different
height.
| ListBase | |
| verticalScrollPolicy : String
A property that indicates whether the vertical scroll bar is always on, always off,
or automatically changes based on the parameters passed to the
setScrollBarProperties() method.
| ScrollControlBase | |
| verticalScrollPosition : Number
The offset into the content from the top edge.
| ScrollControlBase | |