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CHAPTER 4: User-Interface Tools Control objects 136

alignment

(cont’d) For an array value, the first string element defines the horizontal

alignment and the second element defines the vertical alignment.

The horizontal alignment value must be one of

left, right, center

fill. The vertical alignment value must be one of top, bottom,

center, or fill.

Values are not case sensitive.

bounds

Bounds A Bounds object describing the boundaries of the element, in screen

coordinates for

Window elements, and parent-relative coordinates for

child elements (compare windowBounds

). For windows, the bounds

refer only to the window’s content region.

Setting an element’s

size or location changes its bounds property,

and vice-versa.

characters

Number Used by the LayoutManager object to determine the default

preferredSize

for a StaticText or EditText control. The control will be

made wide enough to display the given number of 'X' characters in

the font used by the control. Setting this property is the best way to

reserve space in a control for a maximum number of characters to

display.

checked

Boolean For ListItem objects only. When true, the item is marked with the

platform-appropriate checkmark. When false, no checkmark is drawn,

but space is reserved for it in the left margin, so that the item lines up

with other checkable items. When

undefined, no space is reserved

for a checkmark.

columns

Object For ListBox objects only. A JavaScript object with two read-only

properties whose values are set by the creation parameters:

titles — An array of column title strings, whose length matches

the number of columns specified at creation.

preferredWidths — An array of column widths, whose length

matches the number of columns specified at creation.

enabled

Boolean When true, the control is enabled, meaning that it accepts input.

When false, control elements do not accept input, and all types of

elements have a dimmed appearance. A disabled ListItem

is not

selectable in a ListBox

, DropDownList or TreeView list.

expanded

Boolean For ListItem objects of type node in TreeView list controls. When true,

the item is in the expanded state and its children are shown, when

false, it is collapsed and children are hidden.

graphics

Object A ScriptUIGraphics object that can be used to customize the control’s

appearance, in response to the onDraw

event.

helpTip

String A brief help message (also called a tool tip) that is displayed in a small

floating window when the mouse cursor hovers over a user-interface

control element. Set to an empty string or

null to remove help text.

icon

String or

File

Deprecated. Use image instead.

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