FormLayout

(Preview)

Package	spark.layouts
Class	public class FormLayout
Inheritance	FormLayout VerticalLayout LayoutBase OnDemandEventDispatcher Object

Language Version:

ActionScript 3.0

Product Version:

Flex 4.5

Runtime Versions:

Flash Player 10, AIR 2.5

The FormLayout class defines the default layout for Spark Form skins. FormLayout provides a vertical layout for the child FormItem containers in the Form. If any of the child containers uses a FormItemLayout, FormLayout will align the ConstraintColumns of each child. The number of columns across children should be the same, and the columns should have the same type of width setting. For example, if the first child's second column has a percent width, then the second child's second column should also be a percent width.

Note: Only use the FormLayout class with the Spark Form container. Do not use it to lay out the contents of any other container.

Related API Elements

spark.components.Form
spark.components.FormHeading
spark.components.FormItem
spark.layouts.FormItemLayout

Public Properties

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	Property		Defined By
		clipAndEnableScrolling : Boolean If true, specifies to clip the children to the boundaries of the viewport.	LayoutBase
		constructor : Object A reference to the class object or constructor function for a given object instance.	Object
		dropIndicator : DisplayObject The DisplayObject that this layout uses for the drop indicator during a drag-and-drop operation.	LayoutBase
		firstIndexInView : int [read-only] The index of the first layout element that is part of the layout and within the layout target's scroll rectangle, or -1 if nothing has been displayed yet.	VerticalLayout
		gap : int The vertical space between layout elements, in pixels.	VerticalLayout
		horizontalAlign : String The horizontal alignment of layout elements.	VerticalLayout
		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
		lastIndexInView : int [read-only] The index of the last row that's part of the layout and within the container's scroll rectangle, or -1 if nothing has been displayed yet.	VerticalLayout
		paddingBottom : Number Number of pixels between the container's bottom edge and the bottom edge of the last layout element.	VerticalLayout
		paddingLeft : Number The minimum number of pixels between the container's left edge and the left edge of the layout element.	VerticalLayout
		paddingRight : Number The minimum number of pixels between the container's right edge and the right edge of the layout element.	VerticalLayout
		paddingTop : Number Number of pixels between the container's top edge and the top edge of the first layout element.	VerticalLayout
		requestedMaxRowCount : int The measured height of this layout is large enough to display at most requestedMaxRowCount layout elements.	VerticalLayout
		requestedMinRowCount : int The measured height of this layout is large enough to display at least requestedMinRowCount layout elements.	VerticalLayout
		requestedRowCount : int The measured size of this layout is tall enough to display the first requestedRowCount layout elements.	VerticalLayout
		rowCount : int [read-only] The current number of visible elements.	VerticalLayout
		rowHeight : Number If variableRowHeight is false, then this property specifies the actual height of each child, in pixels.	VerticalLayout
		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
		variableRowHeight : Boolean Specifies whether layout elements are allocated their preferred height.	VerticalLayout
		verticalAlign : String The vertical alignment of the content relative to the container's height.	VerticalLayout
		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

Public Methods

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	Method		Defined By
		FormLayout() Constructor.	FormLayout
		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
		calculateDropLocation(dragEvent:DragEvent):DropLocation Calculates the drop location in the data provider of the drop target for the specified dragEvent.	LayoutBase
		clearVirtualLayoutCache():void When useVirtualLayout is true, this method can be used by the layout target to clear cached layout information when the target changes.	LayoutBase
		dispatchEvent(event:Event):Boolean Dispatches an event into the event flow.	OnDemandEventDispatcher
		elementAdded(index:int):void Called by the target after a layout element has been added and before the target's size and display list are validated.	LayoutBase
		elementRemoved(index:int):void 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
		fractionOfElementInView(index:int):Number 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.	VerticalLayout
		getElementBounds(index:int):Rectangle 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
		getHorizontalScrollPositionDelta(navigationUnit:uint):Number 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
		getScrollPositionDeltaToElement(index:int):Point Computes the verticalScrollPosition and horizontalScrollPosition deltas needed to scroll the element at the specified index into view.	LayoutBase
		getVerticalScrollPositionDelta(navigationUnit:uint):Number Returns the change to the vertical scroll position to handle different scrolling options.	LayoutBase
		hasEventListener(type:String):Boolean Checks whether the EventDispatcher object has any listeners registered for a specific type of event.	OnDemandEventDispatcher
		hasOwnProperty(name:String):Boolean Indicates whether an object has a specified property defined.	Object
		hideDropIndicator():void Hides the previously shown drop indicator, created by the showDropIndicator() method, removes it from the display list and also stops the drag scrolling.	LayoutBase
		isPrototypeOf(theClass:Object):Boolean Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.	Object
		measure():void Measures the target's default size based on its content, and optionally measures the target's default minimum size.	LayoutBase
		propertyIsEnumerable(name:String):Boolean Indicates whether the specified property exists and is enumerable.	Object
		removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void Removes a listener from the EventDispatcher object.	OnDemandEventDispatcher
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Sets the availability of a dynamic property for loop operations.	Object
		showDropIndicator(dropLocation:DropLocation):void Sizes, positions and parents the drop indicator based on the specified drop location.	LayoutBase
		toLocaleString():String Returns the string representation of this object, formatted according to locale-specific conventions.	Object
		toString():String Returns the string representation of the specified object.	Object
		updateDisplayList(width:Number, height:Number):void Sizes and positions the target's elements.	LayoutBase
		updateScrollRect(w:Number, h:Number):void Called by the target at the end of its updateDisplayList to have the layout update its scrollRect.	LayoutBase
		valueOf():Object Returns the primitive value of the specified object.	Object
		willTrigger(type:String):Boolean Checks whether an event listener is registered with this EventDispatcher object or any of its ancestors for the specified event type.	OnDemandEventDispatcher

Protected Methods

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	Method		Defined By
		calculateDragScrollDelta(dropLocation:DropLocation, elapsedTime:Number):Point Calculates how much to scroll for the specified dropLocation during a drag and drop gesture.	LayoutBase
		calculateDropIndex(x:Number, y:Number):int 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
		calculateDropIndicatorBounds(dropLocation:DropLocation):Rectangle 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
		getElementBoundsAboveScrollRect(scrollRect:Rectangle):Rectangle Returns the bounds of the first layout element that either spans or is above the scrollRect's top edge.	LayoutBase
		getElementBoundsBelowScrollRect(scrollRect:Rectangle):Rectangle Returns the bounds of the first layout element that either spans or is below the scrollRect's bottom edge.	LayoutBase
		getElementBoundsLeftOfScrollRect(scrollRect:Rectangle):Rectangle Returns the bounds of the first layout element that either spans or is to the left of the scrollRect's left edge.	LayoutBase
		getElementBoundsRightOfScrollRect(scrollRect:Rectangle):Rectangle Returns the bounds of the first layout element that either spans or is to the right of the scrollRect's right edge.	LayoutBase
		getScrollRect():Rectangle Returns the bounds of the target's scroll rectangle in layout coordinates.	LayoutBase
		scrollPositionChanged():void Called when the verticalScrollPosition or horizontalScrollPosition properties change.	LayoutBase

Constructor Detail

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FormLayout - AS3 Flex

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Package spark.layouts