Remove component from JPanel

Hi,
i've to remove a component from the center (BorderLayout.CENTER) of a JPanel without knowing the name of the component at runtime. I know only that the component is in the center position of the panel. How can i do?
Thanks
Luca

normally what i will do i removeall first and then i add the north or south component so you dont have to worry what is in your center of the panel

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Remove images from JPanel

Hi,
I have a JPanel called imagePanel and a JTree and every time a node is selected in the tree, a set of images are gonna be displayed on the imagePanel
with the loop below. But the next time a node is selected the images that were added via the loop the first time, has to be removed. What code can I use to
empty the imagePanel everytime, before the for-loop runs?
//Some code here to empty the imagePanel so it begins from scratch
for(int index=0; index < imageNames.size(); index++)
ImageIcon newImage = createImageIcon("images/" +
(String)imageNames.elementAt(index));
imagePanel.add(new JLabel(newImage));
pictureLabel.setText(null);
}

Hi ,
try this
jlabel.setIcon( null ) ;

Remove component from JFrame with absolute layout

I have a JFrame and JPanel inside the JFrame with absolute layout. I wanted to have a button when clicked the JPanel will be removed. I called jFrame.remove(jPanel);
jFrame.repaint();
jFrame.validate();
I can't call jFrame.revalidate(), since JFrame doesn't provide revalidate() method. I try everything, but I can't get that JPanel removed. Could somebody help me please. Oh I tried jPanel.setBounds( 0,0,0,0); and the jPanel is disappeared, but I don't think this is the right solution. Is my problem with the absolute layout?
Thanks

public class MainGame
     public void game()
          GridBagLayout gridBagLayout = new GridBagLayout();
          GridBagConstraints constraints = new GridBagConstraints();
          final MainFrame mainFrame = new MainFrame();
          mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          mainFrame.setLayout( gridBagLayout );
          JPanel mainGamePanel = new JPanel();
          mainGamePanel.setLayout( new BorderLayout() );
          mainGamePanel.setBackground( Color.black );
          final Room mainEntrance = new Room( "at the main entrance of the deep forest" );
          mainEntrance.setBackground( Color.white );
          mainEntrance.setLayout( null );
          mainEntrance.setExit( Direction.UP, null );
          mainGamePanel.add( mainEntrance, BorderLayout.CENTER );
//          c.fill = GridBagConstraints.CENTER;
          constraints.ipady = 800;      //make this component tall
          constraints.ipadx = 600;
          constraints.anchor = GridBagConstraints.WEST;
          constraints.gridx = 0;
          constraints.gridy = 0;
          gridBagLayout.setConstraints( mainGamePanel, constraints );
          mainFrame.getContentPane().add( mainGamePanel );
          thePlayer = new Human( "Cloud" , "The player" );
          thePlayer.setMaximumWeight( MAXIMUM_WEIGHT );
          thePlayer.setImage( Constants.CHARACTER_FRONT );
          thePlayer.setBounds(0 , 0, 40, 30 );
          thePlayer.setBorder( BorderFactory.createLineBorder( Color.black ) );
          mainEntrance.add( thePlayer );
          apple = new EdibleItem( "apple" , "Give more 10 HP" );
          apple.setHp( 100 );
          apple.setImage( Constants.APPLE );
          apple.setBounds( 40, 0, 40, 30 );
          apple.setBorder( BorderFactory.createLineBorder( Color.black ) );
          mainEntrance.add( apple );
          thePlayer.addItem( apple );
          apple1 = new JPanelWithBackground();
          apple1.setImage( Constants.APPLE );
          apple1.setBounds( 80, 60, 40, 30 );
          apple1.setBorder( BorderFactory.createLineBorder( Color.black ) );
          mainEntrance.add( apple1 );
//          final Room forest = new Room( "at the main entrance of the deep forest" );
//          forest.setBounds( 0, 0, 800, 600 );
//          forest.setBackground( Color.white );
//          forest.setLayout( null );
//          forest.setExit( Direction.UP, null );
//          // Add to list
          listOfItems.add( apple );
          listOfItems.add( apple1 );
           * Main Control Panel to control character and actions
          JPanel controlPanel = new JPanel();
          controlPanel.setBackground( Color.black );
          controlPanel.setBounds( 1000, 0, 600, 600 );
          controlPanel.setLayout( new GridLayout( 0, 1 ) );
          JButton eatButton = new JButton( "EAT" );
          // Set this button to setFocusable(false) to prevent this button being focused
          // So the focus will stay at JFrame
          eatButton.setFocusable( false );
          eatButton.addActionListener( new ActionListener()
               @Override
               public void actionPerformed(ActionEvent e)
                    JPanelWithBackground currentObject = mainGame.getFacingObject();
                    if( currentObject instanceof EdibleItem )
                         //EdibleItem apple = ( EdibleItem )currentObject;
          controlPanel.add( eatButton );
          JButton attackButton = new JButton( "ATTACK" );
          attackButton.setFocusable( false );
          attackButton.addActionListener( new ActionListener()
               @Override
               public void actionPerformed(ActionEvent e)
                    System.out.println( "Remove" );
                    mainFrame.getContentPane().remove( mainEntrance );
                    mainEntrance.setBounds( 0,0,0,0);
//                    mainFrame.add( forest );
                    mainFrame.validate();
                    mainFrame.repaint();
          controlPanel.add( attackButton );
          mainFrame.setVisible( true );
          mainFrame.requestFocusInWindow();
}I know that my code is a mess, because it is connected with many classes and the quality of the format is not very good. But I will refactor it later when I solved the problem.
The problem is I have a JPanel with a character and an apple in it. I could not use any other layout, I have to use absolute layout, because I the user can control the character but arrow keys. And the character moves in pixels.
Here what I wanted to do.
final Room mainEntrance = new Room( "at the main entrance of the deep forest" );
          mainEntrance.setBackground( Color.white );
          mainEntrance.setLayout( null );
          mainEntrance.setExit( Direction.UP, null );Room extends JPanel, I wanted to delete this panel when I clicked this button
          JButton attackButton = new JButton( "ATTACK" );
          attackButton.setFocusable( false );
          attackButton.addActionListener( new ActionListener()
               @Override
               public void actionPerformed(ActionEvent e)
                    System.out.println( "Remove" );
                    mainFrame.getContentPane().remove( mainEntrance );
                    mainEntrance.setBounds( 0,0,0,0);
//                    mainFrame.add( forest );
                    mainFrame.validate();
                    mainFrame.repaint();
          controlPanel.add( attackButton );Like I said before, I tried validate, repaint and setBounds to all 0s. Nothing happened with the Room class. How do I delete that Room.
Thank you so much.

Get back component from JPanel

by java
I know JPanel can get back components by JPanel.getComponents() like
private JPanel panelCenter = new JPanel ();
panelCenter.getComponents();
I want to know is JPanel able to get component just by the specified component's name?
e.g. panelCenter.getComponent("buttom");
or like vb.net Me.Controls("buttom").Visible = True
Thanks
Francis SZE

None of JPanel, JComponent, Container or Component have a method to get a component by name.
You can either:
1. Keep references to the objects you place in your JPanel (highly recommended :)
or
2. Iterate over the result of getComponents() and test for getName().equals(requestedName)

Mass Removal of component from Maintenance Order Component list

Hi Gurus,
I had a long list of material which have been set with deletion flag. With this list, I had remove them from BOM using CS20. Does anyone knows how to remove a component from the maintenance order component list based on that material had set deletion flag in material master & that GI had not been done? Appreciate your help.
Best regards,
David Tan

I guess we dont have std function to do this..
I will suggest to take help of an abaper & create a code to find material & delete from orders.
Regards

How to delete/remove the software component from integration repository

Dear All
How to delete/remove the software component from integration repository which we have created some Data and message types.
Regards
Blue

Hi,
Follow the steps below to delete the Software component:
1. Delete the created Data Types, Message Types, Message Interfaces, Message Mappings, Interface Mappings and other imported objects like RFC's or IDoc's. Activate all changes.
2. Then delete the namespace and the default datatypes present with the namespace after checking "objects are modifiable".
3. Then delete the SW component, after placing the radio button in "Not permitted".
Regds,
Pinangshuk.

Hi I need Event for removal of component from UIEditor

Hi, JDev team
I need a event to identify removal of component from UIEditor.
I have one method of doing this.Apply viewSelectionListener to the UIEditor but i can'nt use this approach for some reasons.Is there any other way out??

I'm sorry, but Apple does not provide a downgrade path for iOS. Because downgrading is unsupported by Apple we cannot discuss it on these forums.
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Jpanel add/remove component redraw problem

I have a JPanel using a GridLayout for a layout manager. The Jpanel has 2 components. When i remove one component ( using remove(Component comp) method) , and call updateUI on the JPanel, it removes the component but retains the original size. i.e It does not shrink to the size of the one component it has.
How can the required effect be achieved?
Thanks
-sduhra

I have a JPanel using a GridLayout for a layout manager.Well you have a structure like:
parentPanel
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        component1
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So you could use a FlowLayout in the parentPanel and it will respect the size of the GridLayoutPanel. So you resulting code would be something like:
gridLayoutPanel.remove(...);
parentPanel.revalidatge();

Removing Items from a TextArea/Pane Component

Hi All,
I have a question about text containers. Basically I'm reading Strings from a file and I'm displaying them inside a JTextArea. I'm adding new Strings to the JTextArea using it's append() method. Is there a way to limit how much stuff should the JTextArea hold ? After a while my application crashes with the following message:
java.lang.OutOfMemoryError
<<no stack trace available>>
Exception in thread "main"
This is because so much stuff got accumulated in the JTextArea that it eats up all available memory and the app crashes. My question is; is there a way I can remove items from the JTextArea ? Or is there a way to limit the size/number of Stings it can hold ? Or should I be using something else instead of the JTextArea ? Thanks in advance...
-Pete

int size = textArea.getDocument().getLength();
gives the total number of bytes in the text area. You can then use:
textArea.replaceRange("", 0, 80);
to remove 80 characters from the start of the text area. Or to remove the first line from the text area use:
int start = textArea.getLineStartOffset(0);
int end = textArea.getLineEndOffset(0);
textArea.replaceRange("", start, end);
Design your own routine to keep the text area at a reasonable size.

JList run time errors when removing items from list

Hi there
I am having trouble removing items from a JList. For a While it was working fine and now it outputs runtime errors everytime samething gets removed from the lsit
Here is the code
//declare
public class Consumertab1gui extends JPanel implements ActionListener
     public static JList conList = null;
     private static DefaultListModel model = null;
// Create a list with some items
model = new DefaultListModel();
conList = new JList(model);
//set the size of cells in the list with the length of the string
conList.setPrototypeCellValue("Lenght 1234567890");
conList.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
conList.addListSelectionListener(new ValueReporter());
//set a scroll onto the list
JScrollPane conScroll = new JScrollPane(conList);
add(conScroll,c);
//when the button gets pressed to drop the selected item the following code is called
private void dropConsumer()
int selItem=0;
componentsV.comVRemove(conList.getSelectedValue().toString());
selItem=conList.getSelectedIndex();
System.out.println("No:"+(model.getSize()-1));
System.out.println("S:"+selItem);
remConList(selItem);
dropCon.setEnabled(false);
//which in turns calls this
public void remConList(int pos)
     model.remove(pos);
when the model.remove(pos) code is executed the following runtime errors are given:
java.lang.NullPointerException
at Consumertab1gui$ValueReporter.valueChanged(Consumertab1gui.java:197)
at javax.swing.JList.fireSelectionValueChanged(JList.java:1321)
at javax.swing.JList$ListSelectionHandler.valueChanged(JList.java:1335)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:187)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:167)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:214)
at javax.swing.DefaultListSelectionModel.removeIndexInterval(DefaultListSelectionModel.java:546)
at javax.swing.plaf.basic.BasicListUI$ListDataHandler.intervalRemoved(BasicListUI.java:1561)
at javax.swing.AbstractListModel.fireIntervalRemoved(AbstractListModel.java:160)
at javax.swing.DefaultListModel.remove(DefaultListModel.java:478)
at Consumertab1gui.remConList(Consumertab1gui.java:38)
at Consumertab1gui.dropConsumer(Consumertab1gui.java:58)
at Consumertab1gui.actionPerformed(Consumertab1gui.java:46)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:245)
at java.awt.Component.processMouseEvent(Component.java:5100)
at java.awt.Component.processEvent(Component.java:4897)
at java.awt.Container.processEvent(Container.java:1569)
at java.awt.Component.dispatchEventImpl(Component.java:3615)
at java.awt.Container.dispatchEventImpl(Container.java:1627)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)
at java.awt.Container.dispatchEventImpl(Container.java:1613)
at java.awt.Window.dispatchEventImpl(Window.java:1606)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
can anyone spot any mistakes in the code or suggest possible resons as to why these run time errors occur?
Thanks
alexis

java.lang.NullPointerException
at Consumertab1gui$ValueReporter.valueChanged(Consumertab1gui.java:197)The NullPointerException occurs at line 197, in the valueChanged method of your ValueReporter inner class. I have looked through your post several times but I don't see where you posted that method. Anyway, that is where you should look.
PC²

Swap Component in JPanel

Hi there,
I have a JPanel that holds several Components (ThumbnailPanel ... own Class for Displaying Thumbs and Infos of a Pic). I want to have a function to sort this Panel. That means I have Arrow Buttons and can shift a ThumbPanel one to the left or to the right. I try to show you here (its better to understand if you see this):
http://www.rebelman.de/images/tpscreenshot.jpg
the arrows to sort are the small buttons in the upper right corner.
Logically the Components (ThumbnailPanels) are stored in a Vector and they are displayed in a JPanel with GridBagLayout. To shift a Component to the right, I have to swap it with its right neighbour. In the Vector its no problem
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               ImageData startImage     = currList.getImage(selIndex);
               ImageData swappedImage     = currList.getImage(selIndex+1);
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Any working idea? (I just think of swapping the constraint value of gridX ... but how? and does this work? The value for selIndex could point to the wrong component then and selection could run into trouble).
- Frankie
Edit: As mentioned in the last lines, I tried to swap the gridx Value:
Component startComponent = thumbScrollPanel.getComponent(selIndex);
Component swappedComponent = thumbScrollPanel.getComponent(selIndex+1);
GridBagConstraints startConstraints = panelLayout.getConstraints(startComponent);
GridBagConstraints swappedConstraints = panelLayout.getConstraints(swappedComponent);
int startX = startConstraints.gridx;
int swappedX = swappedConstraints.gridx;
startConstraints.gridx = swappedX;
swappedConstraints.gridx = startX;
thumbScrollPanel.validate();This does not work. The order, both Components are displayed is not changing.
Edited by: rebelman on Dec 13, 2007 1:14 AM

Maybe use a GridLayout so you don't have to worry about constraints.
Either way as mentioned above the key is to revalidate() the parent container after you add or remove a component from it. (Sometimes the repaint() is also necessary).

FM for deleting Component from Ibase Hierarchy

Hi,
Is there any FM for deleting Component from Ibase Hierarchy.
I have tried using the FM "CRM_IBASE_COMP_DELETE", it is anyway deleting the component from the hierarchy but not those component
whose is already assigned to a Contract.
I have read these similar thread of only deleting a component but it was not very helpful in my scenario.
In CRM, standard way of removing the component from Ibase Hierarchy is to "CUT" the component and save. The mentioned component will not
be seen in Ibase hierarchy.
So is there any FM which can actually remove or cut the component from the hierarchy even though it is assigned to any contract etc.
Awaiting for your expeditious help on this issue,
Thanks and Regards,
Jojy

Hi Naresh,
Thanks for your response,
Is there any way of doing the same from Std. FM apart from doing it manually.
Mine is Interface scenario in which the call will be instantaneous.
I have tried to dismantle the component also, but it will be remain present in Ibase hierarchy even though it is associated to any contract or not with dismantle sign in it's hierarchy .
I want to cut it so that it will not remain in Ibase hierarchy, it can be present in CRM system.

Add and remove columns from JTable

Help me please!
A try to remove column from JTable. It's removed, but when I try to add column in table, then I get all old (removed early) columns + new column....
I completely confused with it.....
Here is my code for remove column:
class DelC implements ActionListener
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It's little ex for me, I just try understand clearly how it's work (table models i mean). Here is code. All action with tables take place through menu items.
My brain is boiled, I've try a lot of variants of code, but did't get right result :((
It's code represent problem, which I've describe above. If you'll try remove column and then add it again, it will be ma-a-a-any colunms...
I understand, that my code just hide columns, not delete from table model....
But now I have not any decision of my problem...
Thanks a lot for any help. :)
import javax.swing.*;
import java.awt.*;
import javax.swing.table.*;
import java.awt.event.*;
import javax.swing.table.DefaultTableModel;
class JTableF extends JFrame
     Object [] [] data = new Object [0] [2];
     JTable table;
     DefaultTableModel model;
     String [] columnNames = {"1", "2"};
     TableColumnModel cm;
     JTableF()
          super("Table features");
          setDefaultLookAndFeelDecorated( true );
          setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
          JMenuBar MBar = new JMenuBar();
          JMenu [] menus = {new JMenu("A"), new JMenu("B")};
          JMenuItem [] menu1 = {new JMenuItem("Add row"), new JMenuItem("Delete row", 'D'), new JMenuItem("Add column"), new JMenuItem("Delete column")};
          menu1 [ 0 ].addActionListener(new AddL());
          menu1 [ 1 ].addActionListener(new DelL());
          menu1 [ 2 ].addActionListener(new AddC());
          menu1 [ 3 ].addActionListener(new DelC());
          for (int i=0; i<menu1.length; i++)
               menus [ 0 ].add( menu1 [ i ]);
          for (int i=0; i<menus.length; i++)
               MBar.add(menus );
          JPanel panel = new JPanel ();
          model = new DefaultTableModel( data, columnNames );
          table = new JTable (model);
          cm = table.getColumnModel();
          panel.add (new JScrollPane(table));
          JButton b = new JButton ("Add row button");
          b.addActionListener(new AddL());
          panel.add (b);
          setJMenuBar (MBar);
          getContentPane().add(panel);
          pack();
          setLocationRelativeTo (null);
          setVisible (true);
     class DelC implements ActionListener
          public void actionPerformed (ActionEvent e )
               int [] HowManyColDelete = table.getSelectedColumns();
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                         tableCModel.removeColumn (tableCModel.getColumn (vizibleCol));
                    //cm = tableCModel;
               else
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     class AddC implements ActionListener
          public void actionPerformed (ActionEvent e)
               //table.setColumnModel(cm);
               Object NewColumnName = new String();
               NewColumnName = JOptionPane.showInputDialog ("Input new column name", "Here");
               int i = model.getRowCount();
               int j = model.getColumnCount();
               Object [] newData = new Object [ i ];
               model.addColumn ( NewColumnName, newData);
     class AddL implements ActionListener
          public void actionPerformed (ActionEvent e)
               int i = model.getColumnCount();
               Object [] Row = new Object [ i ];
               model.addRow ( Row );
     class DelL implements ActionListener
          public void actionPerformed (ActionEvent e)
               int [] HowManyRowsDelete = table.getSelectedRows();
               if (HowManyRowsDelete.length !=0)
                    for (int k = HowManyRowsDelete.length-1; k>-1; k--)
                         model.removeRow (HowManyRowsDelete[k]);
               else
                    JOptionPane.showMessageDialog(JOptionPane.getRootFrame(), "Row is not selected!");
     public static void main (String [] args)
          javax.swing.SwingUtilities.invokeLater(new Runnable()
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                    JTableF inst = new JTableF();

Problem removing components from JLayeredPane

Hi all,
I have a problem showing and hiding components on a JLayeredPane. It goes Something like this:
In my application I have a button. When this button is pressed I use getLayeredPane to get the frames layered pane. I then add a JPanel containing a number of labels and buttons onto that layered pane on the Popup layer. The panel displays and funcitons correctly.
The problem comes when I try to remove the panel from the layered pane. The panel does not dissappear and I am no longer able to click on anything else in the frame!
If anyone has any ideas how to get around this or what the problem might be I'd be very greatful to hear it. Sample code follows:
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      * @param e
     public void actionPerformed(ActionEvent e)
                JLayeredPane mLayredPane = getLayeredPane();
          int x = 0, y = 0;
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                    y += c.getLocation().y;
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//And when a listener fires from the panel I use
mLayredPane.remove(mPanel);
//To remove it from the layered pane and in theory return the
//app to the state it was before the panel was displayedThanks again...

The problem is you only removed it within the program, without actually removing it from the display. If that makes any sense, or whether thats your problem at all.
If you are only using this line.
mLayredPane.remove(mPanel);
I think if you tell it to repaint and revalidate it should work, though i have never used LayeredPane.
mLayredPane.repaint();
mLayredPane.revalidate();

[Flex 4.5.1] How to remove focus from TextInput on mouse click outside of it?

For me clicking outside of a TextInput should always remove focus from it, only only if you click on another TextInput or Button.
I don't see any simple event like MouseEvent.MOUSE_CLICK_OUTSIDE - which would definitely simplify things.. I wonder why there isn't such event. Well anyway I can't find any other similar event and I can't figure out an easy way to do this. I also wonder why I couldn't find a solution to this on the web easily... Well anyway...
Does someone know how to do that in a convenient way?
Thanks!

ok I understand why is that. For example I have a TextInput now where the user enters number through buttons which have mouseFocusEnabled = false, so the TextInput doesn't lose focus. But on a TabBar I had to set mouseFocusEnabled = true or when I switched between tabs -> switches between states, I could still type in the TextInput in the previous tab cause it didn't lose focus. Maybe TabBar's default value of that property is wrongly set to false.
Anyway, not losing focus when clicking outside is still weird. Take for example this forum, if I click outside of the box I am currently writing this, I lose focus. It's how things usually work. And flex focus is designed to work backwards to what people are used to, no matter as I already pointed out I understand there are cases it comes in handly. I hope I don't sound bad but take it just as a suggestion please that maybe if it is redesigned like this: clicking on component gets focus, clicking outside loses focus. But if you click on a button for example and you want to keep the focus on a TextInput cause you add some text, you should be able to set a property on the Button like maintainCurrentFocus = true (false by default), which would make clicking on the Button not shift the focus to it or set it to null if the component is a group that has some rect background for example, but maintain the focus on the TextInput.
I could be missing something about the current design of how the focus works in flex, but from my point of view at the moment, the design I describe to use is just like how I am usually used to be working with focus as a user, not as developer.
Maybe you could agree or maybe you know some reason by which things are how they are at the moment that I don't see. But if you think I make sense please let me know, maybe I could fill a minor enhancement request for that ?

Remove component from JPanel

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