java ean 13 generator Using Events in Java

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Using Events
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onMouseDragged:function (event : MouseEvent) : Void{ message = eventtoString(); } onMouseEntered:function (event : MouseEvent) : Void{ message = eventtoString(); } onMouseExited:function (event : MouseEvent) : Void{ message = eventtoString(); } onMouseWheelMoved:function (event : MouseEvent) : Void{ message = eventtoString(); } } Label { text: bind message; layoutX:10; layoutY:250; } ] } }
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Keep in mind that the onMouse* events are inherited from Node The major implication of this is that Stage and Scene do not inherit from Node Therefore, you can only trap these events as they occur within Node on the Scene You cannot trap these events if they happen randomly within the context of your Scene
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Another type of event you can trap is a key event The following section goes over how to trap and use key events
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Key Events
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A key event, as the name suggests, is fired when the user interacts with the keyboard Capturing these keyboard events can be very useful For example, you could write a script that allows the user to move objects around the Scene with the arrow keys or to stop some animation using the ESC key Either way, trapping key events can be very useful in your JavaFX scripts The key events are also inherited from Node Therefore, like the onMouse* events, only nodes can trap key events The three onKey* events are onKeyPressed, onKeyReleased,
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and onKeyTyped When a user interacts with the keyboard (or keypad for mobile users), the events are fired in this order: onKeyPressed onKeyTyped onKeyReleased Modify your script from the last section to trap these events The code in your script should look like this when you are finished:
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/* * 9fx * * v10 - J F DiMarzio * * 6/15/2010 created * * Using Events * */ package comjfdimarziojavafxforbeginners; import import import import import import javafxstageStage; javafxsceneScene; javafxsceneshapeCircle; javafxscenepaintColor; javafxscenecontrolLabel; javafxsceneinputKeyEvent;
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/** * @author JFDiMarzio */ var message : String = ""; Stage { title : "UsingEvents" onClose: function () { } scene: Scene { width: 450 height: 400 content: [ Circle { centerX: 100, centerY: 100
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9:
Using Events
radius: 100 fill: ColorBLACK focusTraversable: true; onKeyPressed:function(event: KeyEvent):Void{ message = eventtoString(); } onKeyReleased:function(event: KeyEvent):Void{ message = eventtoString(); } onKeyTyped:function(event: KeyEvent):Void{ message = eventtoString(); } } Label { text: bind message; layoutX:10; layoutY:250; } ] } }
If you look carefully at the code, you will notice one slight difference in the properties of the Circle node To get this example to function correctly, a property named focusTraversable needs to be set The focusTraversable property lets the circle accept the focus of the Scene s action Without this property being set, JavaFX would not be able to tell what node you are interacting with when you type on the keyboard
The focusTraversable property also allows focus to be passed between nodes If you need a user to be able to move focus from node to node, set focusTraversable to true on both nodes
Run this script using the Mobile profile It should run as shown in Figure 9-2 With the script running in the mobile emulator, press the number 2 on the keypad You should see the following:
KeyEvent node [javafxsceneshapeCircle] , char [] , text [2] , code [VK_2] KeyEvent node [javafxsceneshapeCircle] , char [2] , text [2] , code [VK_UNDEFINED] KeyEvent node [javafxsceneshapeCircle] , char [] , text [2] , code [VK_2]
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Figure 9-2 Trapping keys in the Mobile profile
9:
Using Events
Take notice of the char[] property of the KeyEvent This property is only available on onKeyTyped Therefore, if you are trapping just the char[] property, you will only see it on onKeyTyped Now press the up arrow in the emulator and compare the outputs:
KeyEvent node [javafxsceneshapeCircle] , char [] , text [Up] , code [VK_UP] KeyEvent node [javafxsceneshapeCircle] , char [] , text [Up] , code [VK_UP]
Notice that the directional arrows in the mobile profile do not fire the onKeyTyped event They will only fire the onKeyPressed and onKeyReleased events
In the event you cannot see the full event message printed on the screen of the mobile emulator, add the following line to your script With this line in place, the event message will print out to the Output window in NetBeans: Systemoutprintln(message)
It is very important to note what events are fired and in what order This will make your job easier when you are trying to trap and react to user input
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