Calling a JPanel to JInternalFrame.
Hi guys,
I am building an MDI application. I Have a jButton (call NEW) to bring out the JInternalFrame(call FRAME_A) to the JDeskTopPanel(jDeskTopPane1). I have another jButton(call XX). This xx button will insert a JPanel(jPane1) into Frame_A (contain a jSplitPane) RightComponent when press. What coding should i need to write in order for jPane1 insert into Frame_A RightComponent.
By the way I am using Netbeans 5.5
Thanks.
Regards,
Jimmy
Problem Solved
Similar Messages
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Should i call pack() method JPanel component ??
hi,
I studied as pack(); method need to call only to Top-Level component(container) of Swing.. this is enough. No need to call like JPanel() container .
Is this true ?Yep, especially since JPanel doesn't have a pack() method. :)
-
Why my JInternalFrame show two times?
/* I want to Draw a cycle on JPanel in JInternalFrame, but it Draw two times, and when I klick the JInternalFrame, it will show right.
There are two Class, one ist TestDrawingJPanel, another ist DrawingJPanel.
import java.awt.*;
public class TestDrawingJPanel extends javax.swing.JFrame {
/** Creates new form TestDrawingJPanel */
public TestDrawingJPanel() {
initComponents();
DrawingJPanel drawingJPanel=new DrawingJPanel();
jInternalFrame1.getContentPane().add(drawingJPanel,java.awt.BorderLayout.CENTER);
drawingJPanel.start();
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
private void initComponents() {
jInternalFrame1 = new javax.swing.JInternalFrame();
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent evt) {
exitForm(evt);
jInternalFrame1.setBackground(java.awt.Color.white);
jInternalFrame1.setPreferredSize(new java.awt.Dimension(300, 260));
try {
jInternalFrame1.setSelected(true);
} catch (java.beans.PropertyVetoException e1) {
e1.printStackTrace();
jInternalFrame1.setVisible(true);
getContentPane().add(jInternalFrame1, java.awt.BorderLayout.CENTER);
pack();
/** Exit the Application */
private void exitForm(java.awt.event.WindowEvent evt) {
System.exit(0);
* @param args the command line arguments
public static void main(String args[]) {
new TestDrawingJPanel().show();
// Variables declaration - do not modify
private javax.swing.JInternalFrame jInternalFrame1;
// End of variables declaration
import java.awt.*;
public class DrawingJPanel extends javax.swing.JPanel implements Runnable {
/** Creates a new instance of DrawingJPanel */
Graphics g;
Thread thisThread;
public void start(){
thisThread=new Thread(this);
thisThread.start();
public void paint(Graphics g){
g.setColor(Color.black);
g.drawArc((this.getWidth()/2)-100,(this.getHeight()/2)-100,200,200,0,360);
public void run() {
try{
thisThread.sleep(100);
}catch(Exception e){};
repaint();Q1
2 internalframes
ANS
remove any one of these
jInternalFrame1.setVisible(true);
new TestDrawingJPanel().show(); -
How to draw a JPanel in an offscreen image
I am still working on painting a JPanel on an offline image
I found the following rules :
- JPanel.setBounds shall be called
- the JPanel does not redraw an offline image, on should explicitly override paint()
to paint the children components
- the Children components do not pain, except if setBounds is called for each of them
Still with these rules I do not master component placement on the screen. Something important is missing. Does somebody know what is the reason for using setBounds ?
sample code :
private static final int width=512;
private static final int height=512;
offScreenJPanel p;
FlowLayout l=new FlowLayout();
JButton b=new JButton("Click");
JLabel t=new JLabel("Hello");
p=new offScreenJPanel();
p.setLayout(l);
p.setPreferredSize(new Dimension(width,height));
p.setMinimumSize(new Dimension(width,height));
p.setMaximumSize(new Dimension(width,height));
p.setBounds(0,0,width,height);
b.setPreferredSize(new Dimension(40,20));
t.setPreferredSize(new Dimension(60,20));
p.add(t);
p.add(b);
image = new java.awt.image.BufferedImage(width, height,
java.awt.image.BufferedImage.
TYPE_INT_RGB);
Graphics2D g= image.createGraphics();
// later on
p.paint(g);
paint method of offScreenPanel :
public class offScreenJPanel extends JPanel {
public void paint(Graphics g) {
super.paint(g);
Component[] components = getComponents();
for (int i = 0; i < components.length; i++) {
JComponent comp=(JComponent) components;
comp.setBounds(0,0,512,512);
components[i].paint(g);Unfortunately using pack doesn't work, or I didn't use it the right way.
I made a test case, eliminated anything not related to the problem (Java3D, applet ...). In the
test case if you go to the line marked "// CHANGE HERE" and uncomment the jf.show(), you have
an image generated in c:\tmp under the name image1.png with the window contents okay.
If you replace show by pack you get a black image. It seems there still something.
simplified sample code :[b]
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import com.sun.j3d.utils.applet.*;
import com.sun.j3d.utils.image.*;
import com.sun.j3d.utils.universe.*;
import java.io.*;
import java.awt.image.*;
import javax.imageio.*;
public class test {
private static final int width=512;
private static final int height=512;
public test() {
JPanel p;
BorderLayout lay=new BorderLayout();
java.awt.image.BufferedImage image;
// add a JPanel with a label and a button
p=new JPanel(lay);
p.setPreferredSize(new Dimension(width,height));
JLabel t=new JLabel("Hello");
t.setPreferredSize(new Dimension(60,20));
p.add(t,BorderLayout.NORTH);
p.setDebugGraphicsOptions(DebugGraphics.LOG_OPTION );
// show the panel for debug
JFrame jf=new JFrame();
jf.setSize(new Dimension(width,height));
jf.getContentPane().add(p);
[b]
// CHANGE HERE->
jf.pack();
//jf.show();
// create an off screen image
image = new java.awt.image.BufferedImage(width, height,
java.awt.image.BufferedImage.TYPE_INT_RGB);
// paint JPanel on off screen image
Graphics2D g= image.createGraphics();
g.setClip(jf.getBounds());
System.err.println("BEFORE PAINT");
jf.paint(g);
System.err.println("AFTER PAINT");
// write the offscreen image on disk for debug purposes
File outputFile = new File("c:\\tmp\\image1.png");
try {
ImageIO.write(image, "PNG", outputFile);
} catch (Exception e) {
System.err.println(e.getMessage());
g.dispose();
jf.dispose();
public static void main(String[] args) {
test t=new test();
} -
Problem with JPanel, JScroll and JTable
Hi.
On one of my Jframes, i have 3 Jpanels. There are two on one side, and one of the other which spans the height of the other two. However, it does more than span the height of the other two, it streches the height of the Jframe as it is about 300 pixels too heigh.
I'm not sure which element is streching the JPanel, it might be either the Jpanel itself, the JScroll or the JTable. Theres alot of code, however i'm going to try and cut out the irrelevent parts.
I call the Jpanel via:
FarmList = new javax.swing.JPanel();
FarmList.setBorder(javax.swing.BorderFactory.createTitledBorder(null, "Farm List", javax.swing.border.TitledBorder.DEFAULT_JUSTIFICATION, javax.swing.border.TitledBorder.DEFAULT_POSITION, new java.awt.Font("Tahoma", 1, 11)));
FarmList.add(new GetFarms());And the code for the GetFarms() class is:
public class GetFarms extends JPanel {
private final int COLUMNS = 4;
private int ROWS = 2;
private JTable sampleJTable;
private String[][] cells = new String[ROWS][COLUMNS];
public static void main(String[] args) throws Exception {
JFrame frame = new JFrame("Covenant Farm List");
frame.add(new GetFarms());
frame.setSize(450,150);
frame.setVisible(true);
public GetFarms() throws Exception {
URL theUrl = new URL("http://www.allydm.co.uk/Covenant/farm_list.php");
BufferedReader in = new BufferedReader(
new InputStreamReader(
theUrl.openStream()));
String inputLine = in.readLine();
String[] lines = inputLine.split("<br>");
for (int i = 0; i < ROWS; i++) {
String[] stuff = lines.split(" ");
for (int j = 0; j < COLUMNS; j++) {
cells[i][j] = stuff[j];
in.close();
String[] columnNames = {"Username", "DA", "Sentry", "Last Update"};
sampleJTable = new JTable(cells, columnNames);
JScrollPane tablePane = new JScrollPane(sampleJTable);
add(tablePane, BorderLayout.CENTER);
If anyone has any ideas, on how to limit the size of the Jpanel or JScroll it'd be greatly appreciated.did you implement setxxxSize() methods?
see
http://java.sun.com/docs/books/tutorial/uiswing/components/layeredpane.html -
How to resize JPanel at Runtime ??
Hi,
Our Project me t a problem as below, we hope to resize JPanel at Runtime , not at design time, ie, when we first click the button called "Move JPanel" , then we click the JPanel, then we can drag it around within main panel, but we hope to resize the size of this JPanel when we point to the border of this JPanel then drag its border to zoom in or zoom out this JPanel.
Please advice how to do that??
Thanks in advance.
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.Vector;
import javax.swing.*;
import javax.swing.border.LineBorder;
import javax.swing.event.*;
public class ResizeJPanels extends JPanel
protected JLabel label1, label2, label3, label4, labeltmp;
protected JLabel[] labels;
protected JPanel[] panels;
protected JPanel selectedJPanel;
protected JButton btn = new JButton("Move JPanel");
int cx, cy;
protected Vector order = new Vector();
public static void main(String[] args)
JFrame f = new JFrame("Test");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(new ResizeJPanels().GroupJLabels());
f.setSize(600,700);
f.setLocation(200,200);
f.setVisible(true);
private MouseListener ml = new MouseAdapter() {
public void mousePressed(MouseEvent e) {
Point p = e.getPoint();
JPanel jp = new JPanel();
jp.setLayout(null);
Component[] c = ((JPanel)e.getSource()).getComponents();
System.out.println("c.length = " + c.length);
for(int j = 0; j < c.length; j++) {
if(c[j].getBounds().contains(p)) {
if(selectedJPanel != null && selectedJPanel != (JPanel)c[j])
selectedJPanel.setBorder(BorderFactory.createEtchedBorder());
selectedJPanel = (JPanel)c[j];
selectedJPanel.setBorder(BorderFactory.createLineBorder(Color.green));
break;
add(jp);
revalidate();
public JPanel GroupJLabels ()
setLayout(null);
addLabels();
label1.setBounds( 125, 150, 125, 25);
label2.setBounds(425, 150, 125, 25);
label3.setBounds( 125, 575, 125, 25);
label4.setBounds(425, 575, 125, 25);
//add(btn);
btn.setBounds(10, 5, 205, 25);
add(btn);
determineCenterOfComponents();
ComponentMover mover = new ComponentMover();
ActionListener lst = new ActionListener() {
public void actionPerformed(ActionEvent e) {
ComponentMover mover = new ComponentMover();
addMouseListener(mover);
addMouseMotionListener(mover);
btn.addActionListener(lst);
addMouseListener(ml);
return this;
public void paintComponent(final Graphics g)
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
Point[] p;
g2.setStroke(new BasicStroke(4f));
for(int i = 0 ; i < order.size()-1; i++) {
JPanel l1 = (JPanel)order.elementAt(i);
JPanel l2 = (JPanel)order.elementAt(i+1);
p = getCenterPoints(l1, l2);
g2.setColor(Color.black);
// g2.draw(new Line2D.Double(p[0], p[1]));
private Point[] getCenterPoints(Component c1, Component c2)
Point
p1 = new Point(),
p2 = new Point();
Rectangle
r1 = c1.getBounds(),
r2 = c2.getBounds();
p1.x = r1.x + r1.width/2;
p1.y = r1.y + r1.height/2;
p2.x = r2.x + r2.width/2;
p2.y = r2.y + r2.height/2;
return new Point[] {p1, p2};
private void determineCenterOfComponents()
int
xMin = Integer.MAX_VALUE,
yMin = Integer.MAX_VALUE,
xMax = 0,
yMax = 0;
for(int i = 0; i < labels.length; i++)
Rectangle r = labels.getBounds();
if(r.x < xMin)
xMin = r.x;
if(r.y < yMin)
yMin = r.y;
if(r.x + r.width > xMax)
xMax = r.x + r.width;
if(r.y + r.height > yMax)
yMax = r.y + r.height;
cx = xMin + (xMax - xMin)/2;
cy = yMin + (yMax - yMin)/2;
private class ComponentMover extends MouseInputAdapter
Point offsetP = new Point();
boolean dragging;
public void mousePressed(MouseEvent e)
Point p = e.getPoint();
for(int i = 0; i < panels.length; i++)
Rectangle r = panels[i].getBounds();
if(r.contains(p))
selectedJPanel = panels[i];
order.addElement(panels[i]);
offsetP.x = p.x - r.x;
offsetP.y = p.y - r.y;
dragging = true;
repaint(); //added
break;
public void mouseReleased(MouseEvent e)
dragging = false;
public void mouseDragged(MouseEvent e)
if(dragging)
Rectangle r = selectedJPanel.getBounds();
r.x = e.getX() - offsetP.x;
r.y = e.getY() - offsetP.y;
selectedJPanel.setBounds(r.x, r.y, r.width, r.height);
//determineCenterOfComponents();
repaint();
private void addLabels()
label1 = new JLabel("Label 1");
label2 = new JLabel("Label 2");
label3 = new JLabel("Label 3");
label4 = new JLabel("Label 4");
labels = new JLabel[] {
label1, label2, label3, label4
JLabel jl = new JLabel("This is resizeable JPanel at Runtime");
jl.setBackground(Color.green);
jl.setOpaque(true);
jl.setFont(new Font("Helvetica", Font.BOLD, 18));
JPanel jp = new JPanel();
jp.setLayout(new BorderLayout());
panels = new JPanel[]{jp};
jp.setBorder(new LineBorder(Color.black, 3, false));
jp.setPreferredSize(new Dimension(400,200));
jp.add(jl, BorderLayout.NORTH);
for(int i = 0; i < labels.length; i++)
labels[i].setHorizontalAlignment(SwingConstants.CENTER);
labels[i].setBorder(BorderFactory.createEtchedBorder());
jp.add(labels[i], BorderLayout.CENTER);
jp.setBounds(100, 100, 400,200);
add(jp);import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.MouseInputAdapter;
public class Resizing extends JPanel {
public Resizing() {
super(null);
addPanel();
PanelControlAdapter control = new PanelControlAdapter(this);
addMouseListener(control);
addMouseMotionListener(control);
private void addPanel() {
JLabel jl = new JLabel("This is resizeable JPanel at Runtime");
jl.setBackground(Color.green);
jl.setOpaque(true);
jl.setFont(new Font("Helvetica", Font.BOLD, 18));
JPanel jp = new JPanel();
jp.setLayout(new BorderLayout());
jp.setBorder(new LineBorder(Color.black, 3, false));
jp.add(jl, BorderLayout.NORTH);
jp.setBounds(50,50,400,200);
add(jp);
public static void main(String[] args) {
JFrame f = new JFrame("Test");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(new Resizing());
f.setSize(500,400);
f.setLocation(100,100);
f.setVisible(true);
class PanelControlAdapter extends MouseInputAdapter {
Resizing host;
Component selectedComponent;
LineBorder black;
LineBorder green;
Point offset = new Point();
Point start = new Point();
boolean dragging = false;
boolean resizing = false;
public PanelControlAdapter(Resizing r) {
host = r;
black = new LineBorder(Color.black, 3, false);
green = new LineBorder(Color.green, 3, false);
public void mouseMoved(MouseEvent e) {
Point p = e.getPoint();
boolean hovering = false;
Component c = host.getComponent(0);
Rectangle r = c.getBounds();
if(r.contains(p)) {
hovering = true;
if(selectedComponent != c) {
if(selectedComponent != null) // reset
((JComponent)selectedComponent).setBorder(black);
selectedComponent = c;
((JComponent)selectedComponent).setBorder(green);
if(overBorder(p))
setCursor(p);
else if(selectedComponent.getCursor() != Cursor.getDefaultCursor())
selectedComponent.setCursor(Cursor.getDefaultCursor());
if(!hovering && selectedComponent != null) {
((JComponent)selectedComponent).setBorder(black);
selectedComponent = null;
private boolean overBorder(Point p) {
Rectangle r = selectedComponent.getBounds();
JComponent target = (JComponent)selectedComponent;
Insets insets = target.getBorder().getBorderInsets(target);
// Assume uniform border insets.
r.grow(-insets.left, -insets.top);
return !r.contains(p);
private void setCursor(Point p) {
JComponent target = (JComponent)selectedComponent;
AbstractBorder border = (AbstractBorder)target.getBorder();
Rectangle r = target.getBounds();
Rectangle ir = border.getInteriorRectangle(target, r.x, r.y, r.width, r.height);
int outcode = ir.outcode(p.x, p.y);
Cursor cursor;
switch(outcode) {
case Rectangle.OUT_TOP:
cursor = Cursor.getPredefinedCursor(Cursor.N_RESIZE_CURSOR);
break;
case Rectangle.OUT_TOP + Rectangle.OUT_LEFT:
cursor = Cursor.getPredefinedCursor(Cursor.NW_RESIZE_CURSOR);
break;
case Rectangle.OUT_LEFT:
cursor = Cursor.getPredefinedCursor(Cursor.W_RESIZE_CURSOR);
break;
case Rectangle.OUT_LEFT + Rectangle.OUT_BOTTOM:
cursor = Cursor.getPredefinedCursor(Cursor.SW_RESIZE_CURSOR);
break;
case Rectangle.OUT_BOTTOM:
cursor = Cursor.getPredefinedCursor(Cursor.S_RESIZE_CURSOR);
break;
case Rectangle.OUT_BOTTOM + Rectangle.OUT_RIGHT:
cursor = Cursor.getPredefinedCursor(Cursor.SE_RESIZE_CURSOR);
break;
case Rectangle.OUT_RIGHT:
cursor = Cursor.getPredefinedCursor(Cursor.E_RESIZE_CURSOR);
break;
case Rectangle.OUT_RIGHT + Rectangle.OUT_TOP:
cursor = Cursor.getPredefinedCursor(Cursor.NE_RESIZE_CURSOR);
break;
default:
cursor = Cursor.getDefaultCursor();
selectedComponent.setCursor(cursor);
public void mousePressed(MouseEvent e) {
Point p = e.getPoint();
if(selectedComponent != null) {
Rectangle r = selectedComponent.getBounds();
if(selectedComponent.getCursor() == Cursor.getDefaultCursor()) {
offset.x = p.x - r.x;
offset.y = p.y - r.y;
dragging = true;
} else {
start = p;
resizing = true;
public void mouseReleased(MouseEvent e) {
dragging = false;
resizing = false;
public void mouseDragged(MouseEvent e) {
Point p = e.getPoint();
if(dragging || resizing) {
Rectangle r = selectedComponent.getBounds();
if(dragging) {
r.x = p.x - offset.x;
r.y = p.y - offset.y;
selectedComponent.setLocation(r.x, r.y);
} else if(resizing) {
int type = selectedComponent.getCursor().getType();
switch(type) {
case Cursor.N_RESIZE_CURSOR:
r.height -= p.y - start.y;
r.y = p.y;
break;
case Cursor.NW_RESIZE_CURSOR:
r.width -= p.x - start.x;
r.x = p.x;
r.height -= p.y - start.y;
r.y = p.y;
break;
case Cursor.W_RESIZE_CURSOR:
r.width -= p.x - start.x;
r.x = p.x;
break;
case Cursor.SW_RESIZE_CURSOR:
r.width -= p.x - start.x;
r.x = p.x;
r.height += p.y - start.y;
break;
case Cursor.S_RESIZE_CURSOR:
r.height += p.y - start.y;
break;
case Cursor.SE_RESIZE_CURSOR:
r.width += p.x - start.x;
r.height += p.y - start.y;
break;
case Cursor.E_RESIZE_CURSOR:
r.width += p.x - start.x;
break;
case Cursor.NE_RESIZE_CURSOR:
r.width += p.x - start.x;
r.height -= p.y - start.y;
r.y = p.y;
break;
default:
System.out.println("Unexpected resize type: " + type);
selectedComponent.setBounds(r.x, r.y, r.width, r.height);
start = p;
} -
DnD onto a Container (JInternalFrame)
I suspect this question must have been answered already but after much searching I've not found it.
I have an JInternalFrame which contains many components. At the moment I've implemented drag and drop of data to a particular JTextArea within the JInternalFrame. This works nicely but now I'd like to make the entire JInternalFrame the drop target.
I've tried code such as this: setDropTarget(new DropTarget(this, new MyDropTargetListener())); but that's not it. It may be that I need to use the JInternalFrame's Glass Pane / Root Pane / something else as the DropTarget but I've not yet stumbled across the right object.
Can you help ?Thanks for getting back to me diemson but its still not quite working for me.
Perhaps some more information would help. I have a class called Instance which extends JInternalFrame. It contains a Menu bar, toolbar and the main body is a JTabbedPane. I can currently DnD onto a JTextArea which exists on one of the tab panels using the following code.
DropTarget dropTarget = new DropTarget(m_instanceOutputText, new MyDropTargetListener());Because this text area isn't always visible (e.g. if you select a different tab) I'd like to make the entire Instance a drop target. I've tried all of the following but no joy as yet.
// Your suggested approach which makes sense to me but ain't working for me
m_instance.getRootPane().setDropTarget(new DropTarget(m_instance.getRootPane(), new MyDropTargetListener()));
DropTarget dropTarget2 = new DropTarget(getRootPane(), new MyDropTargetListener());
DropTarget dropTarget3 = new DropTarget(m_instance.getContentPane(), new MyDropTargetListener());I'm envious that you've got it working! -
I am trying to capture the graphics of a JPanel and write it to JPEG. I have had success when I add the JPanel to a JFrame, create a BufferedImage, get a Graphics object from the BufferedImage, and then call the JPanel's paint/print. However, when the resolution of the screen is smaller than the size of the JPanel, I get nothing in the extra space when I use paint, and I get the strange effect of some of the leftmost components redrawn in the extra area on the right. If the resolution becomes larger than the panel, it works just fine.
Changing the resolution is not a resonable solution for this application. How can I get around the size limitations of the JFrame to capture the whole contents of the JPanel?The approach suggested by Deudeu should work -- all you have to do is change the button used int he example to your panel. The important line in the posted code is:
BufferedImage im = new BufferedImage(button.getWidth(), button.getHeight(), BufferedImage.TYPE_INT_RGB );
Notice how the buffered image is created with the size of the button (which should be the size of your panel regardless of whether it is larger than the physical screen).
If you haven't already given it a try, try it!
;o)
V.V. -
How to auto generate a different JPanel name or u guys have other ways
displayPanel = new DisplayPanel();
count++;
String frameName = "Frame " + Integer.toString(count);
iframe = new JInternalFrame(frameName, true, true, true, true);
iframe.add(displayPanel);
iframe.setBounds(20, 20, 150, 100);
iframe.setVisible(true);
jDesktopPane1.add(iframe);
iframe.setToolTipText("Internal Frame");
iframe.toFront();
iframe.setName(frameName);with this coding, it is using the same displayPanel.
I would like to let the user to press a ADD button and generate a internal frame with panel.
How can i generate a different this panel with different name like displayPanel1, displayPanel2 and unlimited.
The reason i wanna different name because i wan to call it out the displayPane.
I can call it those different jInternalFrame. But how can i call it those inside jInternalFrame`s displayPane?
Edited by: LxKaneShiro1 on Jul 6, 2008 4:51 PMLxKaneShiro1 wrote:
displayPanel = new DisplayPanel();
count++;
String frameName = "Frame " + Integer.toString(count);
iframe = new JInternalFrame(frameName, true, true, true, true);
iframe.add(displayPanel);
iframe.setBounds(20, 20, 150, 100);
iframe.setVisible(true);
jDesktopPane1.add(iframe);
iframe.setToolTipText("Internal Frame");
iframe.toFront();
iframe.setName(frameName);with this coding, it is using the same displayPanel.
I would like to let the user to press a ADD button and generate a internal frame with panel.
How can i generate a different this panel with different name like displayPanel1, displayPanel2 and unlimited.Any time you see "this" in code, it refers to the object that line of code is in context for--the current object. You cannot change that.
The reason i wanna different name because i wan to call it out the displayPane.
I can call it those different jInternalFrame. But how can i call it those inside jInternalFrame`s displayPane?You do not need a name to "call" a Frame, you just need a reference to it:
myFrame f = new myFrame();"f" contains the reference to your Frame and can be used as you need. If you need another Frame:
myFrame f2 = new myFrame();"f2" now contains reference to a totally separate Frame. -
Request Focus in JInternalFrame
Hello,
I'd like to keep the focus of an JInternalFrame, even if the user clicks on any other frame inside of the desktop. That way he should be "forced" to complete the actual window before switching to another one. Something like IsAlwaysOnTop and HasAlwaysFocus ;-)
I've already tried requestFocusInWindow, but it doesn't work...
thanks,
MatthiasHmm... try FocusAdapter and the method focusLost(FocusEvent e). In the focusLost, call requestFocus() for the JInternalFrame. Maybe not a nice solution, but one that could work...
Tell me if it worked -
Changing JPanel with button click.
Hi, I have a class call TOC(Table of Content) which contains all the buttons. One class call MainController. All buttons I add an actionListener which the MainController class will handle. Anothe class which is the main one which contain a JPanel.
When I click on the button in TOC class, it will go through the MainController class and display the respective JPanel associate with the button.
Now the problem is how do I change the JPanel in the main class with a click on the button in TOC class?
Please advise. Thanks in advance.Not sure what you mean exactly. However,
Assuming that your view class is a JPanel, when you create your controller,
ViewPanel view = new ViewPanel();
MainController controller = new MainController(viewPanel);
In MainController track a reference to your viewPanel. Also in viewPanel have a method called setCurrentPanel(JPanel panel). then int he controller's action listener
public void actionPerformed(ActionEvent ev) {
JPanel pnl = (JPanel) panelMap.get(ev.getSource().getName());
viewPanel.setCurrentPanel(pnl);
I am assuming you have a way of mapping each button to the panel it will use, which is what is in the panelMap. The viewPanel can have a CardPanel layout for the panels it displays and its setCurrentPanel, can bring to front/oradd the specified panel.
Good luck, hope this helps :-) -
Using setBounds on JTextFields within JPanel
Hi folks,
I hope someone can help me with this.
Basically the heirarchy of my UI is as follows:
The top level JFrame has a borderlayout. The north contains a couple of JButtons and the center contains a JTabbedPane.
Each tab in the JTabbedPane is borderlayout, with the South having another JTabbedPane, and the Center having a JPanel containing other UI elements.
In one of these JPanels I want to show a schematic of a plant and on top if over textfields in different locations to current values for different sensors. lets call this JPanel schematicPanel
For schematicPanel I have set the layout to OverlayLayout. The bottom layer for the schematicPanel is a JLabel that is the actual schematic of the plant. The next layer of the schematicPanel is a JPanel that contains all the JTextFields. This JPanel is set to be transparent using setOpaque(false)
For the JPanel that contains the JTextFields I have not set a layout. What I want to do is use setBounds, or setLocation to place the JTextFields in the correct locations. Unfortunately those methods have no affect what so ever.
I have no idea what is wrong.
Thanks for any help that anyone can offer
Shabbir
PS. I tried place the JTextFields directly on the schematicPanel but using setAlignmentX and setAlignmentY does not work very well, and is very cumbersome. If there is a way to make it work I am open to suggestions. Thanks.Firstly, in swing the default layout is BorderLayout.
So when you have not set any layouts the layout is Borderlayout.Now if you want the setBounds(),setLocation() etc methods to take effect for any component the Layout needs to be expicitely set to null.
ThereFore,set the Layout of the JPanel where you want to place JTextFields to null for eg panel.setLayout(null) and then see how the setBounds(),setLocation() etc methods take effect.
Got It!!!
PK -
Can a jpanel refer to its containing jframe to run a method?
I have a JFrame using a card layout. Two separate JPanels are added to the layout, each with its own functioning command buttons. Is there a way for a button click on the first panel to flip the card, i.e., display the second panel?
Edited by: ScottBrush on May 25, 2009 3:40 PMaw heck...
SimpleCardContainerReference.java
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class SimpleCardContainerReference {
private static final Color[] COLORS = {
Color.white, Color.red, Color.blue, Color.yellow,
Color.orange, Color.pink, Color.cyan
private JPanel mainPanel = new JPanel();
private CardLayout cardLayout = new CardLayout();
public SimpleCardContainerReference() {
mainPanel.setPreferredSize(new Dimension(400, 300));
mainPanel.setLayout(cardLayout);
for (int i = 0; i < COLORS.length; i++) {
MyCard card = new MyCard(this, i); // pass reference here
JComponent component = card.getComponent();
component.setBackground(COLORS);
mainPanel.add(component, "Panel " + i);
public JComponent getComponent() {
return mainPanel;
public void nextCard() {
cardLayout.next(mainPanel);
private static void createAndShowUI() {
JFrame frame = new JFrame("SimpleCardContainerReference");
frame.getContentPane().add(
new SimpleCardContainerReference().getComponent());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
createAndShowUI();
MyCard.java
import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
class MyCard {
private JPanel mainPanel = new JPanel();
public MyCard(final SimpleCardContainerReference container, int i) {
JLabel label = new JLabel("Card Panel " + i, SwingConstants.CENTER);
label.setFont(label.getFont().deriveFont(Font.BOLD, 40));
JButton button = new JButton("Next Card");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
container.nextCard(); // container's method called here ***
JPanel btnPanel = new JPanel();
btnPanel.setOpaque(false);
btnPanel.add(button);
mainPanel.setLayout(new BorderLayout());
mainPanel.add(label, BorderLayout.CENTER);
mainPanel.add(btnPanel, BorderLayout.SOUTH);
public JComponent getComponent() {
return mainPanel;
}Edited by: Encephalopathic on May 25, 2009 7:20 PM -
JCheckBox wont receive initial focus in JTable under 1.6
If I have a JCheckBox in a JTable, clicking the checkbox has no effect unless the table already has focus. This is new to 1.6 I believe.
The code example below should illustrate the problem. With focus on the JTextField at the top, try to click a checkbox in the table. It won't take respond. If you click another field in the table first, the checkbox will then begin responding. Two strange things I've noticed with it are.
1) removing the call the table.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE); makes it work correctly. Of course then it won't give up focus correctly.
2) My example has the JTable within a JInternalFrame. If the table is just in a JFrame, the problem disappears. You can commment/uncomment these two lines to see the difference:
initInteralFrame(panel);
//initNoInteralFrame(panel);
I'm very surprised nobody else has noticed this, but I didn't see any postings or bugs on it. Can anyone see something I am doing wrong or find a workaround?
I submitted this bug a while back which is probably related, but this case with the checkbox is a bit less obscure:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6568959
import java.awt.Dimension;
import javax.swing.BoxLayout;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.DefaultTableModel;
public class TableTest2 extends JFrame
public TableTest2()
addWindowListener(new java.awt.event.WindowAdapter()
public void windowClosing(java.awt.event.WindowEvent evt)
System.exit(0);
JPanel panel = new JPanel();
panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
String[] columnNames = {"First Name", "Last Name","Sport","# of Years","Vegetarian"};
//Object[][] data= new Object[3][5];
Object[][] data = {
{"Mary", "Campione","Snowboarding", new Integer(5), new Boolean(false)},
{"Alison", "Huml", "Rowing", new Integer(3), new Boolean(true)},
{"Kathy", "Walrath","Knitting", new Integer(2), new Boolean(false)},
{"Sharon", "Zakhour","Speed reading", new Integer(20), new Boolean(true)},
{"Philip", "Milne","Pool", new Integer(10), new Boolean(false)}
DefaultTableModel myModel = new DefaultTableModel(data, columnNames)
public Class getColumnClass(int c)
return getValueAt(0, c).getClass();
JTable table = new JTable(myModel);
table.setSurrendersFocusOnKeystroke(true);
table.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);
JScrollPane jScrollPane = new JScrollPane();
jScrollPane.setViewportView(table);
panel.add(new JLabel("Field 1"));
panel.add(new JTextField(15));
panel.add(jScrollPane);
// ************ comment out one or the other of these to see error
initInteralFrame(panel);
//initNoInteralFrame(panel);
Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
setSize(new Dimension(800, 600));
setLocation((screenSize.width-800)/2,(screenSize.height-600)/2);
private void initInteralFrame(JPanel panel)
JInternalFrame jif = new JInternalFrame();
JDesktopPane desktop = new JDesktopPane();
jif.setVisible(true);
desktop.add(jif);
setContentPane(desktop);
jif.add(panel);
jif.pack();
private void initNoInteralFrame(JPanel panel)
getContentPane().add(panel);
* @param args the command line arguments
public static void main(String args[])
new TableTest2().setVisible(true);
}It appears to me that the first click is "selecting"
the internal frame to make it active and therefore
have focus.Under 1.5, that appears to be the behavior. Under 1.6 the focus starts out in the internal frame on the JTextField above the JTable. You can click into any field in the table from there fine, but you can't transfer focus from the JTextField outside the table to the JCheckbox in the table... no matter how many clicks. The checkbox only works after the table becomes focused by clicking on one of the other fields or tabbing into the table. -
Memory problem with JTextFields
Hello,
I have a wierd problem with JTextField and the memory.
I need to fill a JPanel with different Components (including JTextFields), then do some calculation, remove the Components and filling the JPanel again.
When i so this too often my i get an OutOfMemory Exception. I narrowed to problem down and wrote a small sample program to demonstrate the problem.
When i call the method doIT (where the Panel is repeatedly filled) from the main-function everything works fine, but when it is called as a result from the GUI-Button-Event the memory for the JTextFields is not freed (even the call of the Garbage collector changes nothing)
When i only use JButtons to fill the Panel everything works fine.
Has anyone an idea why this problem occurs and how i can work around it?
[Edit] I tested it whith java 1.5.0_06, 1.5.0_11, 1.6.0_02
Thanks
Marc
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryUsage;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class MemoryTestDLG extends JDialog {
public MemoryTestDLG(Frame owner) {
// create Dialog with one Button that calls the testMethod
super(owner);
JButton b = new JButton("doIT ...");
b.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
doIT();
setVisible(false);
getContentPane().add(b);
pack();
public void doIT() {
// Testmethod that fills a JPanel 20 times with Components and clears it
// again
JPanel p = new JPanel();
long memUse1 = 0;
long memUse2 = 0;
long memUseTemp = 0;
for (int count = 0; count < 20; count++) {
// Clear the panel
p.removeAll();
// Get memory usage before the task
Runtime.getRuntime().gc();
memUse1 = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage()
.getUsed();
// Fill Panel with components
for (int i = 0; i < 200; i++) {
// The Buttons seem to be released without any problem
p.add(new JButton("test" + Math.random()));
// JTextFields are not released when used from the dialog.
p.add(new JTextField("test " + Math.random()));
// get memory usage after the task
Runtime.getRuntime().gc();
memUseTemp = memUse2;
memUse2 = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage()
.getUsed();
// print Memory results
System.out.println("Memory Usage: " + f(memUse1) + " ->"
+ f(memUse2) + " [ Used:" + f(memUse2 - memUse1)
+ " ] [ Freed: " + f(memUseTemp - memUse1) + "]");
public String f(long m) // formats the output
String s = "" + m;
while (s.length() < 8)
s = " " + s;
return s;
public static void main(String[] args) {
MemoryTestDLG d = new MemoryTestDLG(null);
System.out
.println("------------------ Direct Call (all is OK) -------------------");
d.doIT(); // Memory is freed with every call to JPanel.removeAll()
System.out
.println("------------ Call from Dialog (memory is not freed) -------------");
// The Memory keeps blocked
d.setModal(true);
d.setVisible(true);
System.exit(0);
}Message was edited by:
marcvomorcThank you for your answer,
In this sample the programm does not run out of memory. But when you look at the output you see, that in the first run (direct call) the memory ist freed immediately when tha panel is cleared but in the second run (from the Button) the memory usage is getting bigger and bigger. Wenn you change the number of components to 2000 (4000)
// Fill Panel with components
for (int i = 0; i < 2000; i++) {
// The Buttons seem to be released without any problem
//... ...and use the default memory settings (69mb heap) the programm runns out of memory.
I get the following output:
------------------ Direct Call (all is OK) -------------------
Memory Usage: 445504 -> 8121016 [ Used: 7675512 ] [ Freed: -445504]
Memory Usage: 617352 -> 8114336 [ Used: 7496984 ] [ Freed: 7503664]
Memory Usage: 810488 -> 8491768 [ Used: 7681280 ] [ Freed: 7303848]
Memory Usage: 943704 -> 8114976 [ Used: 7171272 ] [ Freed: 7548064]
Memory Usage: 836760 -> 8505072 [ Used: 7668312 ] [ Freed: 7278216]
Memory Usage: 978352 -> 8114784 [ Used: 7136432 ] [ Freed: 7526720]
Memory Usage: 835552 -> 8498288 [ Used: 7662736 ] [ Freed: 7279232]
Memory Usage: 977096 -> 8114312 [ Used: 7137216 ] [ Freed: 7521192]
Memory Usage: 835640 -> 8498376 [ Used: 7662736 ] [ Freed: 7278672]
Memory Usage: 977296 -> 8115000 [ Used: 7137704 ] [ Freed: 7521080]
Memory Usage: 835392 -> 8504872 [ Used: 7669480 ] [ Freed: 7279608]
Memory Usage: 976968 -> 8115192 [ Used: 7138224 ] [ Freed: 7527904]
Memory Usage: 836224 -> 8501624 [ Used: 7665400 ] [ Freed: 7278968]
Memory Usage: 977840 -> 8115120 [ Used: 7137280 ] [ Freed: 7523784]
Memory Usage: 835664 -> 8498256 [ Used: 7662592 ] [ Freed: 7279456]
Memory Usage: 976856 -> 8114384 [ Used: 7137528 ] [ Freed: 7521400]
Memory Usage: 835784 -> 8502848 [ Used: 7667064 ] [ Freed: 7278600]
Memory Usage: 977360 -> 8114592 [ Used: 7137232 ] [ Freed: 7525488]
Memory Usage: 835496 -> 8502720 [ Used: 7667224 ] [ Freed: 7279096]
Memory Usage: 976440 -> 8115128 [ Used: 7138688 ] [ Freed: 7526280]
------------ Call from Dialog (memory is not freed) -------------
Memory Usage: 866504 -> 8784320 [ Used: 7917816 ] [ Freed: -866504]
Memory Usage: 7480760 ->14631152 [ Used: 7150392 ] [ Freed: 1303560]
Memory Usage: 14245264 ->22127104 [ Used: 7881840 ] [ Freed: 385888]
Memory Usage: 19302896 ->27190744 [ Used: 7887848 ] [ Freed: 2824208]
Memory Usage: 27190744 ->35073944 [ Used: 7883200 ] [ Freed: 0]
Memory Usage: 31856624 ->39740176 [ Used: 7883552 ] [ Freed: 3217320]
Memory Usage: 39740176 ->47623040 [ Used: 7882864 ] [ Freed: 0]
Memory Usage: 44410480 ->52293864 [ Used: 7883384 ] [ Freed: 3212560]
Memory Usage: 52293864 ->58569304 [ Used: 6275440 ] [ Freed: 0]
Memory Usage: 58569304 ->64846400 [ Used: 6277096 ] [ Freed: 0]
Exception occurred during event dispatching:
java.lang.OutOfMemoryError: Java heap spacewhen I outcomment the adding of the JButtons the amount of freed memory is 0 in the second run. So my guess is, that there is a problem with freeing the memory for the JTextFields.
Memory Usage: 447832 -> 6509960 [ Used: 6062128 ] [ Freed: 6332768]
Memory Usage: 722776 -> 6785632 [ Used: 6062856 ] [ Freed: 5787184]
------------ Call from Dialog (memory is not freed) -------------
Memory Usage: 468880 -> 6770240 [ Used: 6301360 ] [ Freed: -468880]
Memory Usage: 6770240 ->13016264 [ Used: 6246024 ] [ Freed: 0]
Memory Usage: 13016264 ->19297080 [ Used: 6280816 ] [ Freed: 0]
Memory Usage: 19297080 ->25570152 [ Used: 6273072 ] [ Freed: 0]
Memory Usage: 25570152 ->31849160 [ Used: 6279008 ] [ Freed: 0]
Memory Usage: 31849160 ->38124368 [ Used: 6275208 ] [ Freed: 0]
Memory Usage: 38124368 ->44402072 [ Used: 6277704 ] [ Freed: 0]
Memory Usage: 44402072 ->50677928 [ Used: 6275856 ] [ Freed: 0]
Memory Usage: 50677928 ->56955880 [ Used: 6277952 ] [ Freed: 0]
Memory Usage: 56955880 ->63232152 [ Used: 6276272 ] [ Freed: 0]
Exception occurred during event dispatching:
java.lang.OutOfMemoryError: Java heap spaceAdditionally the JPanel I am using is not displayed on the screen. It stays invisible the whole time, but i cannot work around that, because the calculation is depending on the values being in components on the JPanel)
Marc
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