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CHAPTER 4: User-Interface Tools Control objects 147

Control event-handling callbacks

The following events are signalled in certain types of controls. To handle the event, define a function with

the corresponding name in the control object. Handler functions take no arguments and have no

expected return values; see “

Defining behavior with event callbacks and listeners” on page 80.

onActivate

Called when the user gives a control the keyboard focus by clicking it or tabbing into

it.

onClick

Called when the user clicks one of the following control types:

Button

IconButton

Checkbox RadioButton

onChange

Called when the user finishes making a change in one of the following control types:

DropDownList

Scrollbar

EditText Slider

ListBox TreeView

X For an EditText control, called only when the change is complete—that is, when

focus moves to another control, or the user types E

NTER. The exact behavior

depends on the creation parameter

enterKeySignalsOnChange; see the

edittext

description.

X For a Slider or Scrollbar, called when the user has finished dragging the position

marker or has clicked the control.

X For a ListBox, DropDownList or TreeView control, called whenever the

selection property changes. This can happen when a script sets the property

directly or removes a selected item from the list, or when the user changes the

selection.

onChanging

Called for each incremental change in one of the following control types:

EditText

Scrollbar

Slider

X For an EditText control, called for each keypress while the control has focus.

X For a Slider or Scrollbar, called for any motion of the position marker.

onCollapse

Called when the user collapses (closes) a node in a TreeView control. The parameter

to this function is the ListItem

node object that was collapsed.

onDeactivate

Called when the user removes keyboard focus from a previously active control by

clicking outside it or tabbing out of it.

onDoubleClick

Called when the user double clicks an item in a ListBox control. The list’s selection

property is set to the clicked item.

onDraw

Called when a container or control is about to be drawn. Allows the script to modify

or control the appearance, using the control’s associated ScriptUIGraphics object

Handler takes one argument, a DrawState object

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