EDOBE XDOM TAKE 6 IR - PRODUCTSHEET Especificações descarregar pdf (Página 71)

CHAPTER 4: User-Interface Tools Types of controls 71

Scrollbar

Like a slider, the scrollbar is a bar with a draggable indicator. It also has “stepper”

buttons at each end, that you can click to jump the indicator by the amount in the

stepdelta property. If you click a point on the bar outside the indicator, the indicator

jumps by the amount in the

jumpdelta property.

You can create scrollbars with horizontal or vertical orientation; if

width is greater

than

height, it is horizontal, otherwise it is vertical. Arguments to the add method

that creates the scrollbar define values for the

value, minvalue and maxvalue

properties.

Scrollbars are often created with an associated

EditText field to display the current

value of the scrollbar, and to allow setting the scrollbar’s position to a specific value.

This example creates a scrollbar with associated

StaticText and EditText elements

within a panel:

dlg.sizePnl = dlg.add(‘panel’, undefined, ‘Dimensions’);

dlg.sizePnl.widthSt = dlg.sizePnl.add(‘statictext’, undefined,

‘Width:’);

dlg.sizePnl.widthScrl = dlg.sizePnl.add(‘scrollbar’, undefined,

300, 300, 800);

dlg.sizePnl.widthEt = dlg.sizePnl.add(‘edittext’);

ListBox

DropDownList

TreeView

These controls display lists of items, which are represented by ListItem objects in

the

items property. You can access the items in this array using a 0-based index.

X A ListBox control displays a list of choices. When you create the object, you

specify whether it allows the user to select only one or multiple items. If a list

contains more items than can be displayed in the available area, a scrollbar may

appear that allows the user to scroll through all the list items. A list box can

display items in multiple columns; see “

Creating multi-column lists” on page 73.

X A DropDownList control displays a single visible item. When you click the control,

a list drops down and allows you to select one of the other items in the list.

Drop-down lists can have nonselectable separator items for visually separating

groups of related items, as in a menu.

X A TreeView control is similar to a ListBox, except that the items can have child

items. Items with children can be expanded or collapsed to show or hide the child

items. Child items can in turn contain children.

X The title property provides an optional label; the titleLayout property places

the label with respect to the list.

You can specify the choice items on creation of the list object, or afterward using the

list object’s

add() method. You can remove items programmatically with the list

object’s

remove() and removeAll() methods.

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