spark.layouts.ViewMenuLayout - ActionScript® 3.0 Reference for the Adobe® Flash® Platform

Package	spark.layouts
Class	public class ViewMenuLayout
Inheritance	ViewMenuLayout LayoutBase OnDemandEventDispatcher Object

Language Version:

ActionScript 3.0

Product Version:

Flex 4.5

Runtime Versions:

AIR 2.5

The ViewMenuLayout class defines the layout of the ViewMenu container. The menu can have multiple rows depending on the number of menu items.

The requestedMaxColumnCount property defines the maximum number of menu items in a row. By default, the property is set to three.

The ViewMenuLayout class define the layout as follows:

If you define three or fewer menu items, where the requestedMaxColumnCount property contains the default value of three, the menu items are displayed in a single row. Each menu item has the same size.
If you define four or more menu items, meaning more menu items than specified by the requestedMaxColumnCount property, the ViewMenu container creates multiple rows.
If the number of menu items is evenly divisible by the requestedMaxColumnCount property, each row contains the same number of menu items. Each menu item is the same size.
For example the requestedMaxColumnCount property is set to the default value of three and you define six menu items. The menu displays two rows, each containing three menu items.
If the number of menu items is not evenly divisible by the requestedMaxColumnCount property, rows can contain a different number of menu items. The size of the menu items depends on the number of menu items in the row.
For example the requestedMaxColumnCount property is set to the default value of three and you define eight menu items. The menu displays three rows. The first row contains two menu items. The second and third rows each contains three items.

You can create your own custom layout for the menu by creating your own layout class. By default, the spark.skins.mobile.ViewMenuSkin class defines the skin for the ViewMenu container. To apply a customized ViewMenuLayout class to the ViewMenu container, define a new skin class for the ViewMenu container.

The ViewMenuSkin class includes a definition for a Group container named contentGroup, as shown below:

    <s:Group id="contentGroup" left="0" right="0" top="3" bottom="2" 
        minWidth="0" minHeight="0"> 
        <s:layout> 
            <s:ViewMenuLayout horizontalGap="2" verticalGap="2" id="contentGroupLayout" 
                requestedMaxColumnCount="3" requestedMaxColumnCount.landscapeGroup="6"/> 
        </s:layout> 
    </s:Group>

To apply your customized ViewMenuLayout class, your skin class should define a container named contentGroup. That container uses the layout property to specify your customized layout class.

MXML Syntax expanded

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

  <s:ViewMenuLayout 
    Properties
    horizontalGap="2"
    requestedMaxColumnCount="3"
    verticalGap="2"
  />

More examples

Set the layout of a ViewMenu container

Learn more

Define menus in a mobile application

Related API Elements

spark.components.ViewMenu
spark.components.ViewMenuItem
spark.skins.mobile.ViewMenuSkin

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
		horizontalGap : Number The horizontal space between columns, in pixels.	ViewMenuLayout
		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
		prototype : Object [static] A reference to the prototype object of a class or function object.	Object
		requestedMaxColumnCount : int The maximum number of columns to display in a row.	ViewMenuLayout
		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
		verticalGap : Number The vertical space between rows, in pixels.	ViewMenuLayout
		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
		ViewMenuLayout() Constructor.	ViewMenuLayout
		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
		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

Property Detail

horizontalGap

property

horizontalGap:Number

Language Version:

ActionScript 3.0

Product Version:

Flex 4.5

Runtime Versions:

AIR 2.5

The horizontal space between columns, in pixels.

The default value is 2.

This property can be used as the source for data binding. When this property is modified, it dispatches the propertyChange event.

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

Related API Elements

verticalGap

requestedMaxColumnCount

property

requestedMaxColumnCount:int

Language Version:

ActionScript 3.0

Product Version:

Flex 4

Runtime Versions:

AIR 1.5

The maximum number of columns to display in a row.

The default value is 3.

Implementation
public function get requestedMaxColumnCount():int
public function set requestedMaxColumnCount(value:int):void

verticalGap

property

verticalGap:Number

Language Version:

ActionScript 3.0

Product Version:

Flex 4.5

Runtime Versions:

AIR 2.5

The vertical space between rows, in pixels.

The default value is 2.

This property can be used as the source for data binding. When this property is modified, it dispatches the propertyChange event.

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

Related API Elements

horizontalGap

Constructor Detail

ViewMenuLayout

()

Constructor

public function ViewMenuLayout()

Language Version:

ActionScript 3.0

Product Version:

Flex 4.5

Runtime Versions:

AIR 2.5

Constructor.

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Classes x

horizontalGap

requestedMaxColumnCount

verticalGap

ViewMenuLayout