I want to implement DropTargetListener with a JTable as a target. This is roughly what I would like to do: @Override public void dragOver(DropTargetDragEvent event) { MyItem item = getMyItemFromTransferable(); int nrows = item.getTableRowsRequiredForDrop(); // now highlight rows in the table under the drop cursor. } Ho...
Hi guys, Just wondering if you could help wanting to produce an activity stream in Java, the idea was to have a JLabel and text area followed by a divider be displayed on a screen and then repeated X amount of times according to what data was in a database. What I was wondering is how could I possibly repeat the placing the jlabel, tex...
I found out recently that JList (finally!) was "generified" in JDK7. Why JTree and related classes/interfaces are not changed the same? It would be a huge improvement. Casting Object is going on one's nerves. NOTE: The javadoc had not yet been updated, see here and here. ...
I have a Popup that is shown when a user clicks on a button. I would like to hide the popup when any of the following events occur: The user clicks somewhere else in the application. (The background panel for example) The user minimizes the application. The JPopupMenu has this behavior, but I need more than just JMenuItems. The follo...
I simply want to change the size (diameter) of the actual (default) ImageIcon of my JRadioButton. I've changed the size of the font displayed in the widget, so it really looks silly with such a large radiobutton. JRadioButton button = new JRadioButton("Button"); button.setFont(new Font("Lucida Grande",Font.PLAIN, 11)); gives me this g...
Hi I an issue with editors in a JTable. I have a column which displays data as 26,687,489,800.00 ie: Double. When the user clicks the cell to edit the data it is displayed as -2.66874908E10. I want the data to be edited as it appears when it is displayed ie: 26,687,489,800.00 - without the E10 etc... Any help would be appreciated. M...
How to get a sidebar JPanel of a fixed with with Swing. Now I'm trying this: public SidebarPanel() { this.setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS)); this.setPreferredSize(new Dimension(200, this.getPreferredSize().height)); ... But when I resize the window also the width of the sidebar changes. How to fix this...
The issue I'm having is issue with is I'm trying to get the paintComponent to draw the circle only when the mouse is clicked, dragged, then let go. However inside my paintPanel class I have to initialize the object I've created (ex. movedCircle myCircle = new movedCircle(0,0,0,0);) just creating the object movedCircle myCircle; gives an ...
Hi, I'm trying to create a subclass of JButton or AbstractButton that would call specified .actionPerformed as long as the mouse is held down on the button. So far I was thinking of extending JButton, adding a mouse listener on creation (inside constructor) and calling actionPerformed while the mouse is down. So far i came up with that ...
Sorry I don't know if this is very clear, but I'm pretty new to Java. So I have a JFrame with a BorderLayout containing a JPanel and a JButton. What I want to do is when something happens in my JPanel, I want for example change the text of the JButton, or enable/disable it. How would I do that? How can I access the JButton from the JP...
I got some question regarding the approach to create an solitaire game in java. What is the best way of handling the cards in Swing? How can I drag them, and what is the best way to snap them into their right positions? ...
Hello, everyone! I know that GUI code in Java Swing must be put inside SwingUtilities.invokeAndWait or SwingUtilities.invokeLater. This way threading works fine. Sadly, in my situation, the GUI update it that thing which takes much longer than background thread(s). More specific: I update a JTree with about just 400 entries, nesting de...
I am working on a project that uses Java Swing. The default look and feel of the Java Swing GUI is very boring. Is there any way I can use a better look and feel? Something like on web pages... ...
I'm trying to get a JProgressBar to increment by 1 every 100th of a second, and at the moment I'm using Thread.sleep(100) inside a while statement like so: try { while (i<=100){ doTime(); } } catch (InterruptedException ex) { Logger.getLogger(SplashScreen.class.getName()).log(Level.SEVERE, ...
I need to perform a task repeatedly that affects both GUI-related and non GUI-related objects. One caveat is that no action should performed if the previous task had not completed when the next timer event is fired. My initial thoughts are to use a SwingTimer in conjunction with a javax.swing.SwingWorker object. The general setup would l...
I'm using a custom JLayeredPane. I have several Shapes which needed to be drawn on different layers in the JLayeredPane. To test this I create a JPanel and ask its graphics. Then I draw a test rectangle on that JPanel (preparing the graphics) and in my paintComponent method from the JLayeredPane I finally draw everything. But this fail...
I have to develop a whiteboard application in which both the local user and the remote user should be able to draw simultaneously, is this possible? If possible then any logic? I have already developed a code but in which i am not able to do this, when the remote user starts drawing the shape which i am drawing is being replaced by his ...
When i run this code the paintComponent method is not being called It may be very simple error but i dont know why this, plz. package test; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Point; import java.awt.image.BufferedImage; import javax.swing.BorderFactory; import javax.swing.JPanel;...
I would like to have a button in my window such that if I click it (button) the window is closed. I found out that I can close a window in the following way: referenceToTheFrame.hide(); //hides the frame from view refToTheFrame.dispose(); //disposes the frame from memory But if I do this way, compiler complains: Note: myProgram.java...
For the following code, I am not able to set the column size to a custom size. Why is it so?Also the first column is not being displayed. import java.awt.BorderLayout; import java.awt.GridLayout; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTable; import javax.swing.table.TableColumn; public class Trial...