< Jewel Components list

Jewel HContainer


Available since version 0.9.7.

Class Extends
org.apache.royale.jewel.HContainer org.apache.royale.jewel.supportClasses.container.AlignmentItemsContainerWithGap

Note: This component is currently only available for JavaScript.


The Jewel HContainer class is a Container that lays out elements horizontally and provides some properties to allow more flexibility like gap to define spacing between items, and itemsHorizontalAlign and itemsVerticalAlign, to distribute elements in different ways along the horizontal or vertical axis.

Example of use

In MXML declare a HContainer like this:

<j:HContainer width="100%" height="300" gap="3" itemsHorizontalAlign="itemsCenter">
	<j:Card width="100" height="50%">
		<j:Label text="horz center"/>
	<j:Card width="100" height="50%">
		<j:Label text="horz center"/>

In ActionScript we can do the same in the following way.

var hc:HContainer = new HContainer();
// add a label to the HContainer
var label:Label = new Label();
label.text = "Some text";
// add the HContainer to the parent

where parent is the container where the HContainer will be added.

Relevant Properties and Methods

Check the Reference of org.apache.royale.jewel.HContainer for a more detailed list of properties and methods.


PROPERTY Type Description
currentState String The name of the current state.
itemsExpand Boolean Make items resize to the fill all container space.
itemsHorizontalAlign String Distribute all items horizontaly. Possible values are: itemsLeft, itemsCenter, itemsRight, itemsSpaceBetween, itemsSpaceAround
itemsVerticalAlign String Distribute all items verticaly. Possible values are: itemsSameHeight, itemsCenter, itemsTop, itemsBottom
gap Number Assigns variable gap in steps predefined in Jewel CSS.
numElements int The number of element children that can be laid out.
mxmlContent Array The array of childs for this container. Is the DefaultProperty.
states Array The array of view states. These should be instances of org.apache.royale.states.State
strandChildren IParent An object to access the immediate children of the strand.
variableRowHeight Boolean Specifies whether layout elements are allocated their preferred height.


Method Parameters Description
addElement c(IChild), dispatchEvent(Boolean=true) Add a component to the parent.
addElementAt c(IChild), index(int), dispatchEvent(Boolean=true) Add a component to the parent at the specified index.
getElementIndex c(IChild) Gets the index of this subcomponent.
getElementAt index(int) Get a component from the parent at specified index.
removeElement c(IChild), dispatchEvent(Boolean=true) Remove a component from the parent.

Relevant Events

The most important event is initComplete, which indicates that initialization of the container is complete.

It is needed when some action coded in a callback function needs to be triggered when the container is ready to use after initialization.

You can attach callback listeners to the initComplete event in MXML as follows:

<j:HContainer initComplete="initCompleteHandler(event)"/>

the initComplete event uses the initCompleteHandler callback function you provide in ActionScript:

        private function initCompleteHandler(event:Event):void {
            trace("HContainer is ready!");

When the container is initialized the message “HContainer is ready!” appears in the console log.

In ActionScript we can add an event handler this way:

var hc:HContainer = new HContainer();
hc.addEventListener('initComplete', initCompleteHandler);

Relevant Beads

Bead Type Implementation Description
ContainerView org.apache.royale.core.IBeadView This is the default view bead.
HorizontalLayout org.apache.royale.core.IBeadLayout This is the default layout bead.
Viewport org.apache.royale.core.IViewport Define the area that display content.

Optional Beads

Bead Type Implementation Description
ContainerDataBinding org.apache.royale.binding.DataBindingBase Provide binding capabilities to the container.

More examples

Other useful Jewel containers components are: