barcode generator source code in vb.net Using Events in Java

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Using Events
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The anonymous function will need to take in a MouseEvent as a parameter Import the following package to use MouseEvent:
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import javafxsceneinputMouseEvent;
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Two instances of MouseEvent appear in different packages There is another MouseEvent in the javaawt package You will receive errors in this example if you import the wrong one
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Now you can set up a simple function to write the event to a variable, as seen in the following code sample:
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function (event : MouseEvent) : Void{ message = eventtoString(); }
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Use this function in each of the mouse events you want to trap The contents of the event will then be written out to the label on the screen You can start with the onMousePressed event of the circle node that you added to the Scene:
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onMousePressed: function (event : MouseEvent) : Void{ message = eventtoString(); }
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The logic here is that when onMousePressed is triggered that is, when the user presses the mouse button within the bounds of the circle node the event is captured and written out to the message variable This variable, which is bound to the label text, is written to the screen just below the circle Replicate this same anonymous function for the onMouseReleased and onMouseClicked events of the circle node Your finished code should look like this:
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/* * 9fx * * v10 - J F DiMarzio * * 6/15/2010 created * * Using Events * */
JavaFX: A Beginner s Guide
package comjfdimarziojavafxforbeginners; import import import import import import javafxstageStage; javafxsceneScene; javafxsceneshapeCircle; javafxscenepaintColor; javafxscenecontrolLabel; javafxsceneinputMouseEvent;
/** * @author JFDiMarzio */ var message : String = ""; Stage { title : "UsingEvents" onClose: function () { } scene: Scene { width: 450 height: 400 content: [ Circle { centerX: 100, centerY: 100 radius: 100 fill: ColorBLACK onMousePressed: function (event : MouseEvent) : Void{ message = eventtoString(); } onMouseReleased:function (event : MouseEvent) : Void{ message = eventtoString(); } onMouseClicked:function (event : MouseEvent) : Void{ message = eventtoString(); } } Label { text: bind message; layoutX:10; layoutY:250; } ] } }
Run the code in the default profile You will see a black circle on the screen like the one shown in Figure 9-1 Now, move your mouse into the circle and click the mouse button This will fire the onMousePressed event of the circle and write the following information to the screen:
MouseEvent [x=1290, y=920, button=PRIMARY PRESSED
9:
Using Events
Figure 9-1 A black circle
Release the mouse button without moving it You should see the following information:
MouseEvent [x=1290, y=920, button=PRIMARY CLICKED
This indicates that the onMouseClicked event has fired Let s perform another test Try pressing down the mouse button inside the circle, dragging the mouse a few pixels, and then releasing it You should see the following information display:
NOTE
Both lines will not display at the same time; instead, they display sequentially MouseEvent [x=860, y=890, button=PRIMARY PRESSED] MouseEvent [x=1330, y=1290, button=PRIMARY, dragX 630, dragY 270 RELEASED]
Notice that the x and y coordinates of the drag are recorded in the press and release Using this information, you can tell how far an item was dragged, what direction it was dragged in, and where it was released
JavaFX: A Beginner s Guide
Try adding the remaining mouse events to the script (shown next) and testing different scenarios You should see a large amount of very useful information that you can trap and act upon in your scripts
/* * 9fx * * v10 - J F DiMarzio * * 6/15/2010 created * * Using Events * */ package comjfdimarziojavafxforbeginners; import import import import import import javafxstageStage; javafxsceneScene; javafxsceneshapeCircle; javafxscenepaintColor; javafxscenecontrolLabel; javafxsceneinputMouseEvent;
/** * @author JFDiMarzio */ var message : String = ""; Stage { title : "UsingEvents" onClose: function () { } scene: Scene { width: 450 height: 400 content: [ Circle { centerX: 100, centerY: 100 radius: 100 fill: ColorBLACK onMousePressed: function (event : MouseEvent) : Void{ message = eventtoString(); } onMouseReleased:function (event : MouseEvent) : Void{ message = eventtoString(); } onMouseClicked:function (event : MouseEvent) : Void{ message = eventtoString(); }
9:
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