1. How can I use listeners to access other elements? stackoverflow.comI'm setting up a GUI where I need to take information inputted from form elements and manipulate the information. This requires me to use some elements to access others. For example, I ... |
2. Problem with keylistener stackoverflow.comhi i'm using swing and in my main frame(JFrame) i want that when ever user press + key one window lets say test should appear. my key listener works fine if i ... |
3. How resource intensive are Listeners in java? stackoverflow.comI'm new to Java Programming but an experienced C++ programmer. I was learning how to program GUIs using swing. I was wondering how resource intensive (runtime as well as memory) ... |
4. writing global listener stackoverflow.comI want the active window (i.e JFrame ot JDialog) to receive specific keyEvent so that whereever the focusing this keyevent is handling by the window such as ALT+F4 if you press it ... |
5. How to resolve swing listener memory leaks? stackoverflow.comBackground So I read that often memory leaks within Swing applications originate from the use of various listeners (mouse, key, focus, etc). Essentially, you register an object as a listener and forget ... |
6. Why keylistener is not working here? stackoverflow.comi have implemented keylistener interface and implemented all the needed methods but when i press the key nothing happens here, why? |
7. swing: event listener support class stackoverflow.comIs there any preexisting class that helps support add/remove EventListener operations? (kind of like PropertyChangeSupport) I'm trying to partition my code into a model and view in Java. I have some data ... |
8. mouse listener event stackoverflow.comI have got a program having an array of buttons, each of these button has their mouselistener event. Now, how can i find which of the buton is clicked through the mouse ... |
9. Java/Swing: Problem with key listener stackoverflow.comI have a search dialog with a JTextField that's being used as a search box. When the user types something, it searches the DB, shows the result in a JTable and selects ... |
10. Beginning with event listeners stackoverflow.comI have a simple app, showing picture made of tiled images(named u1, u2,...,u16.jpg). Now I'd like to add some Events to it, so that I can show these images only when ... |
11. Create Listener similar to MouseListener stackoverflow.comI want to create a listener that works like mouselistener, but it must be a component: F.e. i have two JComponents (One is a button, and second is MyComponent), and i want ... |
12. When to use EventListenerList instead of a general collection of listeners stackoverflow.comWhen I learned how to fire events in Java, I became familiar with EventListenerList. When I create my own listeners, I write the listener so it extends EventListener, I store them ... |
13. Java Swing - KeyListener stackoverflow.comHow can I know when the key typed change my text? Or if the key is a char? |
14. Java action listener question stackoverflow.comI am creating a custom JPanel element (a login form). I want to allow people who use my panel to subscribe/listen to an event called "loginSuccessful". What is the best way to ... |
15. In Java/Swing, is there a way to legally "attempt to mutate in notification"? stackoverflow.comI was wondering if there is some sort of magic I can use to get around an IllegalStateException and allow a JTextField to "attempt to mutate in notification", or in other ... |
16. Custom Java Mouse Listeners? stackoverflow.comFirst off, I came to Java as a website programmer. In JavaScript, all you have to do to add a mousemove, mouseover, or click event is call an addEventListener function. From ... |
17. java item listener stackoverflow.comi need help regarding the save menu item i have in my menu bar. i have set the code to |
18. Problem with basic listener behaviors in Java stackoverflow.comIt's a little embarassing to not know how to fix this on my own, seeing how I have a bit of experience with Java, however until now I've never really done ... |
19. action listener in another class - java stackoverflow.comit is possible to have two class, and in one something like |
20. is there a NO MOTION mouse listener? stackoverflow.comI have a map applet, and I have a JLabel following the mouse, whenever the mouse goes over a city the JLable displays the the name of the city and population. I ... |
21. KeyListener not reacting stackoverflow.comIm trying to use a KeyListener to do something when the button m is pressed, it needs to add an image to a JPanel, however it doesn't do anything :/ I use ... |
22. Setting action listener on system applications stackoverflow.comHow can I set the |
23. Java GUI listeners without AWT stackoverflow.comI am a starting Java developer, learning just from internet tutorials. I am learning full screen GUI applications. I was told yesterday that I shouldn't use AWT in my programs, because ... |
24. My program's Action Listener won't work stackoverflow.comIt's me again and I just can't seem to get this code to work. I'm basically asking for any advice on why the button does nothing when clicked. Would you like ... |
25. Java Swing - Change JComponent opacity from mouse listener stackoverflow.comPretty much like the title says - I've got a JPanel, and I'd like to have it at 90% opacity if inactive, and full opacity if moused over. I've got the separate ... |
26. ComboBoxModel events not working stackoverflow.comI seem not to grasp the concept of Events and such. After reading a while on how to implement the listeners and such I came across the Java tutorial saying I ... |
27. Listener invokes another listener stackoverflow.comIn a class which creates a menu using Swing I have added 4 items, each one of them is responsible for drawing a circle of different color. I have assigned to ... |
28. The Single Responsibility Principle and Event Listeners stackoverflow.comI'm currently trying to develop a simple GUI notepad to increase my skills in OOP. I stick to the Single Responsibility Principle while developing. I've divided the application into several parts following the ... |
29. listener element overhead in non-GUI mode. jmeter.512774.n5.nabble.comHello - Quick question on listener element overhead when running in non-GUI mode. I have a JMeter testcase that runs a fair bit of load (900 threads x 30 loops per thread x 2 samplers = 54000 requests). This always runs in non-GUI mode. The max JVM heap memory allocated is about 1 GB. However, I am ... |
30. No listener in batch (non-gui) mode jmeter.512774.n5.nabble.comI'm using a custom listener to send results to another application. When I start a test plan in non-gui mode, the listener doesn't seem to be getting called. Is this expected behavior? Is it possible to create a listener that does get called in non-gui mode or am I missing something simple? --------------------------------------------------------------------- To unsubscribe, e-mail: [hidden ... |
31. Running listeners in non gui mode jmeter.512774.n5.nabble.comWhat are you trying to do? Visualizers are not run in non-GUI mode... On 07/09/06, duciuc <[hidden email]> wrote: > > Is it necessary to implements new Listetner in package > org.apache.jmeter.visualizers in order to run it in non gui mode? > -- > View this message in context: http://www.nabble.com/Running-listeners-in-non-gui-mode-tf2231850.html#a6186377> Sent from the JMeter - Dev forum at Nabble.com. > > ... |
32. 'Global' keylistener coderanch.com |
33. KeyListener() is sometimes deaf coderanch.comThis newbie needs some help from the 'old hands'. Context: The task of the small program is to display a worldmap image and then to read some data files with vector data to be drawn on top of the image. The approach (mostly plagiarized from "Just Java 2") is to: instantiate a JFrame instantiate a JPanel instantiate an ImageIcon with the ... |
34. Listener in a listener coderanch.com |
35. KeyListener not working for ONE particular key! coderanch.com |
36. Need help with event listener -> coderanch.comHello all Swing/AWT freaks out there! The problem I am trying to solve in the middle of the night (it's 2.15 am here in Sweden), is that I have a JButton in a JFrame. When this button is pressed an Event is raised which I have delegated to a sperate event listener class. When this particular event arises I want the ... |
37. event listeners cleaned up properly? coderanch.comWhenever I create any type of GUI component, it normally has one or more event listeners attached to it. I add all of these using addXXXListener() etc. When the component gets garbage collected, does the reference to the event listener get left somewhere, meaning that the event listener object will never get cleaned up until the program finishes? Should removeXXXListener() be ... |
38. Key Listeners coderanch.comimport java.awt.*; import java.awt.event.*; class TestKeyPress extends Frame { public TestKeyPress() { addKeyListener( new KeyAdapter() { public void keyTyped( KeyEvent ke ) { System.out.println( "Key was typed" ); } public void keyPressed( KeyEvent ke ) { System.out.println( "Key was pressed" ); } public void keyReleased( KeyEvent ke ) { System.out.println( "Key was released" ); } }); setSize( 100, 100 ); setVisible( ... |
39. KeyListener reading coderanch.com |
40. Aren't Listeners very strange creatures? coderanch.comPlaying around with listeners here I've noticed that when you're checking for modifiers, the listener still gets invoked twice. Typing ALT-6 for example : The listener gets modifier ALT and key ALT the first time. The listener gets modifier ALT and key 6 the second time. I suppose this makes sense but it seems messy when you're doing one check for ... |
41. Can I have listener on the table header? coderanch.comHi Samuel, Yes, some idea. Replace MouseMotion with MouseClicked and you have a great example. import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.table.*; public class JTableHeaderListener extends Frame { private JTable table; private DefaultTableModel dtm; public JTableHeaderListener() { setSize( 500, 500 ); dtm = new DefaultTableModel( 5, 5 ); table = new JTable( dtm ); JScrollPane sp = new JScrollPane( table ... |
42. Why Don't Key Listeners Work After Serializing? coderanch.com |
43. Listener not getting message? coderanch.com |
44. "Global Fields" used in listeners coderanch.comI have a gui that uses a couple ActionListeners to respond to button clicks. Within those listeners, I use values entered in fields on the JFrame. I'm currently creating the listeners as inner classes and making the text fields private class variables so the listeners have access to them. I'm concerned about this approach because I'd rather have the text fields ... |
45. Listener Classes coderanch.comI have several class files in my SWING GUI. Some or even all may contain JCheckBoxes, JRadioButtons, etc. Components that require a listener. Anyway, I want to have only one Listener Class for each Component. For instance, I may have 3 classes that use a JCheckBox and I want only one MyCheckBoxListener Class to listen for all the checkboxes in my ... |
46. One strange question about listener coderanch.comHi Walter, That is because you are overriding the processWindowEvent method. The default functionality is to notify all the component's registered listeners. Since you are overridding that functionality and not performing it the windowClosing method will not be called. By calling the parent processWindowEvent you are restoring the default functionality. It is not normal to override processXXXXEvent methods unless you want ... |
47. Listeners And OOP coderanch.comHi Ray, The easiest approach would be to have the SomeGUI handle the button clicks. If it requires a handle to MasterFrame then you need to pass it into the SomeGUI constructor and keep a copy of it as a private class variable. For example: class SomeGUI extends JPanel implements ActionListener { private MasterFrame mf; public SomeGUI() { this( null ); ... |
48. Is there another way to implement event listener (in general)? coderanch.comHi all, I am having this feeling over and over when i need to attach a listener to a particular Container. When i create an applet or a frame with text fields and buttons, i have to implement the event listener on the applet/frame. If i want to create another class to implement the event listener, this class has to be ... |
49. Global keylistener coderanch.com |
50. keyListener in java coderanch.com |
51. Listener and adapter class coderanch.com |
52. keyListener coderanch.com |
53. Generic Tag Listener - Request for Comment coderanch.comHello, I have developed a GenericTagListener class which (I Hope..) will help developers who frequently need to use JTrees in combination with other components in their GUI's Basically the idea is that there are 3 maps 1. Component Map 2. Value Map 3. Component Type Map In the component map you register a component key with a component. In the value ... |
54. confusion in the Item listener coderanch.comiam using a item listener for a jcombobox that is used in a particular column of a table! the combobox contains only two elements " yes" and "no" i need to display a message when eigther of "yes" or "no" is selected. the confusion is when i press a cell of the particular column in the table, a message box is ... |
55. Action Listeners coderanch.comHi, I have code with a Check Box in an applet. Even when the box is checked the the output still says it is false. Meggsy import java.awt.*; import java.awt.event.*; import java.applet.*; import javax.swing.*; public class HotelApplet extends JApplet { private JLabel CNameLabel, CustomerTitleLabel; private JTextField CNameText, CAddressText, CIdText; private JButton printBut, resetButton; private JTextArea printDetails; private JComboBox CTitleCombo; private String ... |
56. listener problems coderanch.com |
57. Listeners the pro way... coderanch.com |
58. Action Listener coderanch.comThank you this works fine for me. Are you interested helping me with another matter ? If you are please read on I am now trying to save the contents of Ausgabe but I am not sure if Iam using the right method the Speichern is the save method here is the changed code import java.awt.*; import java.awt.event.*; import javax.swing.*; import ... |
59. The best approach for event listener coderanch.comIt depends on what you are trying to do, but personally, the first version is much more readable, and should be OK to use in the majority of circumstances. Probably the *worst* designed GUIs I have seen have been from the code created through visual GUI creators, so I would definately not try to learn good coding habits from code generation ... |
60. KeyListener coderanch.comimport java.awt.*; import java.awt.event.*; import java.util.Random; import javax.swing.*; public class KeyRegister { static JPanel panel; static Random r; public static void main(String[] args) { r = new Random(); panel = new JPanel(); panel.setBackground(getNewColor()); panel.getInputMap().put(KeyStroke.getKeyStroke("W"), "COLOR"); panel.getActionMap().put("COLOR", color); JFrame f = new JFrame("Press \"w\" Key For Color"); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.getContentPane().add(panel); f.setSize(400,300); f.setLocation(200,200); f.setVisible(true); } private static Action color = new AbstractAction() { public ... |
61. Events and Listeners - Im very confused! coderanch.com |
62. keyListener problem coderanch.com |
63. How to write my own Event ( & Listener for it)?? coderanch.comTake a look at this receipt: 1. Create the class MyEvent. It must extend EventObject. //------------------------------------------------------------ //file MyEvent.java import java.util.EventObject; public class MyEvent extends EventObject { public MyEvent(Object source) { super(source); } } //_______________________end file 2. Create the listener class. It must extend EventListener. //------------------------------------------------------------ //file MyEventListener.java public interface MyEventListener extends EventListener { public void myEventOccurred(MyEvent evt); } //_______________________end file 3. ... |
64. Splitpanes and Listener coderanch.comimport java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.tree.*; public class Communication { public static void main(String[] args) { JFrame f = new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.getContentPane().add(new CommunicationPanel()); f.setSize(400,400); f.setLocation(200,200); f.setVisible(true); } } class CommunicationPanel extends JPanel { JTree tree; JTable table; String[][] headers; JScrollPane tableScroll; JLabel[] formLabels; public CommunicationPanel() { createTree(); createTableInfo(); tableScroll = new JScrollPane(); tableScroll.setPreferredSize( new Dimension(tableScroll.getPreferredSize().width, 200)); ... |
65. KeyListener coderanch.comI have an application that is set up like this, the main frame is a jframe, I have a menu bar on it and two jpanels on the inside of the jframe, one to hold the textfields and one to hold my buttons, previous and next. I want to add keylisteners to the application so that when you press the right ... |
66. Listeners execution coderanch.com |
67. Events and Listener List coderanch.com |
68. key listeners.. coderanch.com |
69. problem with listener coderanch.comimport javax.swing.*; import java.awt.event.*; import java.awt.*; public class CTRL_Vis_StudInfo implements ActionListener { private GUI_Vis_StudInfo2 gvs; private DBFasadeStudent dao; String valg="i"; public CTRL_Vis_StudInfo(GUI_Vis_StudInfo2 gvs){ this.gvs = gvs; } public void actionPerformed(ActionEvent e) { if (e.getSource() == gvs.getRadionr()) { System.out.println("nr"); valg="n"; System.out.println(valg); gvs.getSok().setText("Ske etter student-nr:"); gvs.getSokButton().setVisible(true); } if (e.getSource() == gvs.getRadioFornavn()) { System.out.println("fornavn"); valg="f"; System.out.println(valg); gvs.getSok().setText("Ske etter fornavn:"); gvs.getSokButton().setVisible(true); } if (e.getSource() == ... |
70. listener dead? coderanch.comhi, i have 1 GUI class that has buttons, and the listener is in the CTRL class. they are somehow connected with each other. but nothing happens when i do something with the GUI. public class GUI_Vis_StudInfo2 extends JDialog{ HoyreStud hoyre = new HoyreStud(); VenstreStud venstre = new VenstreStud(); SorStud sor = new SorStud(); public GUI_Vis_StudInfo2(JFrame f, boolean b, DBKobling k) ... |
71. text listeners coderanch.com |
72. Problem in Relation to Action Listener coderanch.com |
73. inherited vs. implements Listeners coderanch.com |
74. Mouse Listener Problem coderanch.comimport java.awt.*; import java.awt.event.*; import javax.swing.*; public class Events { JDialog dialog; JLabel label; public Events() { JFrame f = new JFrame(); prepareDialog(f); JTable table = getTable(); table.addMouseListener(new TableListener(table)); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.add(getUIPanel(table), "North"); f.add(new JScrollPane(table)); f.setSize(400,400); f.setLocation(200,200); f.setVisible(true); } private void prepareDialog(Frame f) { label = new JLabel(); label.setHorizontalAlignment(JLabel.CENTER); dialog = new JDialog(f, false); dialog.add(label); dialog.setSize(300,200); dialog.setLocationRelativeTo(f); } private void launchDialog(JTable table) ... |
75. Listener/Events Help coderanch.comHi, I am pretty much a swing/awt newbie but feel I have a good grasp on Java itself. I am designing a log in type window and have the text fields and buttons layed out. I want the program to do something(right now just print the contents of the text field to standard output) when I click the 'OK' button. When ... |
76. Probelm with KeyListener coderanch.com |
77. KeyListener Issue coderanch.com |
78. KeyListener woes coderanch.comI would like this program to move a picture around the screen as someone presses the arrow keys. The problem is, I can't get the KeyListener to listen to keys while it's looping in my page flipping loop. There is a MouseListener attached to my window that works great. However, the KeyListener I added doesn't do a thing. I've tried a ... |
79. Doumnet Listener Problem coderanch.com |
80. KeyListener Problem coderanch.com |
81. problem in two listener?????? coderanch.comhi all the problem arises due to two listener first one is Document Listener and another is the Caret Lisstenet, i used Caret listenet to treet my coded special characters "< |
82. how to use a listener coderanch.comhi, i am using swt/jface. i am using mvc architecture. the problem is that i have a class called application which contains menuitem 'show details/hide' whose text toggles. i have also a buton 'show detail/hide' which is defined in another view class and the button action is defined in an controller class. the view is bined to controller. the controller is ... |
83. listeners coderanch.com |
84. Key Event listener question. coderanch.comCould someone explain to me how to make a Key Event Happen. I have done some button listeners for example. usernameButton.addActionListener(new UsernameButtonListener()); Do I set up a key event the same way? If so what is the correct syntax when doing this? I then have my actual even for the button listener as follows: public class UsernameButtonListener implements ActionListener { public ... |
85. How will I create a common key listener? coderanch.comHi, everybody! I am coding a simple form which is attached to a table. My jtextfields take its values from the corresponding columns of the table. My question is how can I make a common key listener which listens to a PageUp or PageDown keypress from ANY of the jtextfields which signals that I should navigate accordingly through my resultset. What ... |
86. Swings, Event Listeners & OutOfMemoryError: Solutions? coderanch.comSomething I just read by Tony Morris in the advanced forum struck a chord with me. You start a VM with 256MB heap, and during operation it averages about 80-100MB heap, until it gets to one certain piece of resource intensive code that attempts to allocate 200MB, which of course, results in a OOME. What do you do? Shut down and ... |
87. KeyListener && KeyEvents coderanch.comHello , My problem had two various things. 1- I wanna dedect when tab key is pressed or typed or released. i tried ; public void keyPressed(KeyEvent ke) { System.out.println("keyPressed"); if (ke.getKeyCode() == ke.VK_TAB) { System.out.println("tab-keyPressed"); } } I dont even get the first message when i type tab key. Its moving to another focusable component and seems No Keyevent fired. ... |
88. Listener for doubleclick coderanch.com |
89. TextViewer, StyleRange, Listener coderanch.com |
90. Key Listener coderanch.comok here is a snippet of my code in one of my JPanel constructors... KeyListener ShipListener = new KeyListener(){ public void keyPressed( KeyEvent e) { if(e.getKeyCode() == KeyEvent.VK_UP) System.out.println("up pushed"); if(e.getKeyCode() == KeyEvent.VK_DOWN) System.out.println("down pushed"); if(e.getKeyCode() == KeyEvent.VK_LEFT) System.out.println("left pushed"); if(e.getKeyCode() == KeyEvent.VK_RIGHT) System.out.println("right pushed"); repaint(); } public void keyReleased(KeyEvent e){} public void keyTyped(KeyEvent e){} }; this.addKeyListener(ShipListener); ok for some reason, ... |
91. KeyListener working randomly coderanch.comI have a program that the key listeners only work at random. When I start the program they work sometimes, and sometimes they dont work. my code is as follows private void setUpListeners() { Container clientArea = getContentPane(); clientArea.setFocusable(true); addKeyListener(new KeyAdapter(){ public void keyPressed(KeyEvent e){ if(e.getKeyCode() == KeyEvent.VK_UP ){ rightPaddleMovementStatus = MOVE_PADDLE_UP; } if(e.getKeyCode() == KeyEvent.VK_DOWN ){ rightPaddleMovementStatus = MOVE_PADDLE_DOWN; } ... |
92. listeners coderanch.comI am having trouble attaching listeners to my gui. Here is my my code for the guipublic class ParserGUI extends JFrame { public ParserGUI() { super("Lisp Function"); setBounds(XOFFSET,YOFFSET,XWIDTH,YHEIGHT); setDefaultCloseOperation(EXIT_ON_CLOSE); input = new JTextField(20); in = new JLabel("input"); output = new JTextField(10); out = new JLabel("output"); text = new JPanel(); text.add(in); text.add(input); text2 = new JPanel(); text2.add(out); text2.add(output); calc = new JButton("Calculate"); ... |
93. JSpinner arrow listener coderanch.comnot sure I understand the question, but this will give you access to the arrow buttons import javax.swing.*; import java.awt.*; import java.awt.event.*; class Testing { public void buildGUI() { JPanel p = new JPanel(); JSpinner spinner = new JSpinner(new SpinnerNumberModel(50, 0, 100, 5)); spinner.setUI(new MyUI()); p.add(spinner); JFrame f = new JFrame(); f.getContentPane().add(p); f.pack(); f.setLocationRelativeTo(null); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setVisible(true); } public static void main(String[] ... |
94. those crazy listeners! coderanch.com |
95. How do I get this listener to wait for this other listener? coderanch.comI am working with a "Frame" object (see below) which I am not allowed to modify. The JButton in this Frame has its own listener. I need to add a new ActionListener to this button in order to expand its functionality. I can't get this to work the way I want it to, and I think it's due to a synchronization ... |
96. Class implements Listeners coderanch.comYou wouldn't notice the efficiency difference. There might be a few milliseconds, but when you take maybe 0.3seconds to click a button, that is an imperceptible delay. What I think you would notice, and I have fulminated about it on these fora before, is a maintenance overhead. BTW: There is a link in the most recent Java Developers' Network newsletter to ... |
97. Listeners and GC coderanch.comWhen adding listeners to components (e.g. addActionListener), do we need to remove them explicitly afterwards, or will the garbage collector clear them properly when a window is closed ? I'm using a profiler and it seems that the listener stays around unless I explicitly remove it from its source. If anybody could share some light on this. [ March 29, 2007: ... |
98. Focuslost listener for TableViewer coderanch.comI have an editable tableviewer. I want to sort the rows with the date value entered in the columns but when the user has lost focus on the row i.e. I want to do the sorting when the user has clicked onto a different row. How do I add a focuslost listener to a TableViewer. Thanks for any help. |
99. Can a Single Listener class implements multipls type of Listeners coderanch.com |
100. Events listener are not working. coderanch.comI have three events which are passing parameters: a,id and scale. The drawing is successful except listener no responses. I guess I missed something, but where is it? Please advise. Thanks. import java.io.*; import java.util.List; import java.util.ArrayList; import java.util.LinkedList; import java.util.ListIterator; import java.util.Scanner; import java.awt.Font; import java.awt.Color; import java.awt.Graphics; import java.awt.BasicStroke; import java.awt.GradientPaint; import java.awt.geom.GeneralPath; import java.awt.AlphaComposite; import java.awt.Composite; import java.awt.geom.*; ... |