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CHAPTER 4: User-Interface Tools Control objects 139

selection

(ListBox)

Array of

ListItem

For a ListBox, an array of ListItem objects for the current selection in a

multi-selection list. Setting this value causes the selected item to be

highlighted and to be scrolled into view if necessary. If no items are

selected, the value is

null. Set to null to deselect all items.

The value can also change because the user clicked or double-clicked

an item, or because an item was removed with remove()

removeAll()

. Whenever the value changes, the onChange callback is

called. If the value is changed by a double click, calls the

onDoubleClick

callback.

You can set the value using the index of an item or an array of indices,

rather than object references. If set to an index value that is out of

range, the operation is ignored. When set with index values, the

property still returns object references.

X If you set the value to an array for a single-selection list, only the

first item in the array is selected.

X If you set the value to a single item for a multi-selection list, that

item is added to the current selection.

selection

(DropDownList,

TreeView)

ListItem For a DropDownList or TreeView list object, the currently selected

ListItem

object.

Setting this value causes the selected item to be highlighted and to

be scrolled into view if necessary. If no item is selected, the value is

null. Set to null to deselect all items.

The value can also change because the user clicked on an item, or

because an item was removed with remove()

or removeAll().

Whenever the value changes, the onChange

callback is called.

You can set the value using the index of an item or an array of indices,

rather than object references. If set to an index value that is out of

range, the operation is ignored. When set with an index value, the

property still returns an object reference.

shortcutKey

String The key sequence that invokes the onShortcutKey callback for this

element (in Windows only).

size

Dimension A Dimension object that defines the actual dimensions of an element.

Initially

undefined, and unless explicitly set by a script, it is defined

by a

LayoutManager.

Although a script can explicitly set size before the layout manager is

invoked to establish an element size other than the

preferredSize

or the default size, this is not recommended.

Defined as

[bounds.width, bounds.height]. Setting an element’s

size changes its bounds property, and vice-versa.

stepdelta

Number The amount by which to increment or decrement a Scrollbar

element’s position when the user clicks a stepper button.

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