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Events
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Pressing the button by clicking with the mouse or pressing the Spacebar key on the keyboard will set the disable variable of the text box to true, causing it to redraw itself to indicate that it can no longer accept input, as shown in Figure 15-28
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Figure 15-28
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A disabled TextBox
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Now if you press the Tab key or click in the text box, you will find that it is no longer possible to give it the input focus Click the button again, and the text box will be reenabled and again able to be focused Receiving Key Events To process key events, you assign a function to one or more of the following variables of a node:
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public var onKeyPressed:function(:KeyEvent):Void public var onKeyTyped:function(:KeyEvent):Void public var onKeyReleased:function(:KeyEvent):Void
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Each of these functions is passed an argument of type javafxsceneinputKeyEvent that describes a change in the state of the keyboard On lines 31 to 39 of Listing 15-15, we assign to each of these variables a function that prints information about the events that it receives Some of the variables of the KeyEvent class are listed in Table 15-13We discuss these variables in some detail in this section and the sections that follow
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Table 15-13 Variable
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char code code text
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Variables of the KeyEvent Class Type
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String KeyCode Node String
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The character associated with this event The key code for the key that has been pressed or released The node that is the source of the event A string that describes the KeyCode value
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If you click in the text box and then press and release the A key on your keyboard, you see three keyboard events:
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Pressed: char - '', code - 'VK_A' text - 'A' Modifiers: Typed: char - 'a', code - 'VK_UNDEFINED' text - ''
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15 Node Variables and Events
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Modifiers: Released: char - '', code - 'VK_A' Modifiers:
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text - 'A'
The first and last events seem natural one is reported when the key is pressed, the other when it is released So why is there a third event There are actually two different categories of key events low-level ones, delivered to the onKeyPressed and onKeyReleased functions, that report what actually happened, and a higher-level event that is usually more meaningful to application code, delivered to the onKeyTyped function Types of Key Events The key-pressed event reports the pressing of the A keyYou can tell that it s the A key because of the value of the code attribute, which is of type javafxsceneinputKeyCodeThis class defines a large number of constant instances that correspond to keys on a keyboardThe one that corresponds to the A key is called KeyCodeVK_A If you look at the documentation for this class, you see that there is no instance called KeyCodeVK_a that is because, like the keyboard itself, the KeyCode class does not distinguish between upper- and lowercase letters It is important to realize that the key-pressed and key-released events report the operation of a key, not the typing of a letter or other symbol, and at this level there is no concept of upper- or lowercase letters This concept is, however, recognized by the higher-level key-typed event, which is concerned with characters, not keys You can see that the char attribute of the key-typed event is a, whereas that of the keypressed and key-released events is an empty string Note also that the code attribute of the key-typed event does not convey any useful informationThese differences reflect the character-oriented nature of the key-typed event and the key-oriented nature of the other two The KeyCode class itself represents a key on the keyboard It does not have any public instance variables, but it does provide two public class functions:
public function values():KeyCode[] public function valueOf(name:String):KeyCode
The values() function returns a sequence containing all the possible KeyCode instancesThe valueOf() function returns the KeyCode instance for a given key given by its name For example, this code gets and prints the KeyCode for the A key:
var keyCode = KeyCodevalueOf("VK_A"); println("keyCode for VK_A is {keyCode}");
To test whether a particular key on the keyboard has been pressed, compare the value of the code variable from a KeyEvent delivered to the key-pressed or key-released handler with the KeyCode instance for that key:
var code = evtcode; if (code == KeyCodeVK_A) { // The 'A' key has been pressed }