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The ListView Control
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typedThe last character, an o, was typed within the last two seconds and therefore has not yet been hidden from view
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Figure 22-21
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The PasswordBox control
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The ListView Control
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The ListView control displays a representation of a sequence of itemsA list view contains an entry for each element of the sequence, with the order of entries matching that of the sequence elementsThe elements may be displayed either horizontally and vertically In either case, if the space required to display all the elements is larger than that available, a scrollbar is automatically added The user (or application code) can select an item from the list, and application code can react to changes in the selection by monitoring the values of the corresponding ListView variables
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Creating a ListView
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The variables of the ListView class are listed in Table 22-12
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Table 22-12 Variable
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items
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Variables of the ListView Class Type
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Object[]
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Access
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Default
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Empty
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Description
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The items to be displayed Whether the list should be vertical or horizontal Whether the user can scroll the list content by holding the mouse down over a cell and dragging
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vertical
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Boolean
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true
pannable
Boolean
true
22 Cross-Platform Controls
Table 22-12 Variable
Variables of the ListView Class Type
Integer
(Continued) Default
Access
Description
The index of the lead selected item, or -1 if there is no selection The lead selected item, or null if there is no selection The index of the focused item in the list The focused item in the list, or null if the list is empty A function that creates list cells on demand If this is not provided, a default factory is used
selectedIndex
selectedItem
Object
null
focusedIndex
Integer
focusedItem
Object
cellFactory
function() :ListCell
A functioning list view control can be created with only a few lines of code, as shown in Listing 22-9
Listing 22-9 Creating ListView Controls
Stage { title : ListView #1 var scene:Scene; scene: scene = Scene { content: [ VBox { width: bind scenewidth height: bind sceneheight padding: Insets { top: 4 left: 4 bottom: 4 right: 4 } spacing: 8 nodeHPos: HPosCENTER content: [ ListView { items: for (i in [099]) { Element #{i} }
The ListView Control
layoutInfo: LayoutInfo { hgrow: PriorityNEVER hfill: false } } ListView { items: for (i in [099]) { Element #{i} } vertical: false layoutInfo: LayoutInfo { vgrow: PriorityNEVER height: 40 } } ] } ] } }
This code, which you ll find in the file javafxcontrols/ListView1fx, creates two list views, one vertical and one horizontal, each containing 100 elements, as shown in Figure 22-22
Figure 22-22
Two ListView controls, each with 100 elements
As you can see, the vertical list view has a fixed default preferred height that makes it take up enough vertical space to show about ten rows At the time of this writing, the same applies when it is in a horizontal configuration, which is typically not a good idea
22 Cross-Platform Controls
(and is probably a bug) In this example, the height variable of a LayoutInfo object is used to set a more reasonable preferred height for the horizontal ListView As you can see, scrollbars have been added automatically to allow the user to scroll the control so that the other items can be brought into view Because the pannable variable is true by default, it is also possible to scroll the set of visible items by dragging them vertically or horizontally Dynamic List Content The list view is designed to efficiently display lists of data that could be very large in a relatively small area of screenThe data may be hard-coded, as it is in the examples that you have seen so far in this section, or it may be obtained from a database or a web server JavaFX makes it easy to retrieve and present data from remote systems, as you ll see in 26, Charts However the data is obtained, all you have to do to make it accessible to the user is convert it to a sequence of objects and install that sequence in the items variable of the list viewThe sequence does not have to be static the list view updates itself automatically if you add, remove, or replace elements of the sequenceThe code in Listing 22-10, which you will find in the file javafxcontrols/ListView2fx, creates a list view control and a text box control and allows you to add new entries to the list view by typing them into the text boxYou can see the result of running this code on the left of Figure 22-23
Figure 22-23