Help with JScrollPane
I have a JScrollPane that I need to add multiple components to. That includes 5 JButtons, and 5 Jtree's.
I need to add all of the components at once, making the JTree's visible and invisible by clicking the JButton's. My first problem is when I try to add multiple objects to the JScrollPane using the default layout manager. The last object added is always stretched to fill the entire viewport. This makes the objects first added un-viewable. So I decided to first add all of the objects to a Box then add the Box to the scrollpane.
My second problem occurs when I make a JTree visible, aftering adding it to the Box. It draws the tree completely from top to bottom as it should, but clips the right end of titles on the nodes. The horizontal scroll adjusts enought so that you can scroll far enough to the right, but the titles are cut off.
If I add one of the JTree's directly to the JScrollPane it behaves as it should, showing the complete node titles.
I've tried revalidating, updating, and repainting without success.
So, first question is can multiple objects be added to a JScrollPane using the default layout manager, without having the last object hide the previously added objects?
Secondly, does anyone know why nodes in a JTree would be clipped when added to a Box then added the Box added to a JScrollPane. And more importantly how to fix it.
Any help would be appreciated,
Thanks,
Jim
Hi there
Im not sure on exactly what you are trying to do.
But if you want multiple components in one JScrollPane
I would use a JPanel that I would add to the JScrollPane
On that JPanel I would then add my components.
I would also use GridBagLayout instead of any other layout manager. Thats because it is the most complex
layout manager and it will arrange the components as I whant.
If you whant to be able to remove a component from the view by making them invisible. I think I would consider
JLayeredPane.
on a JLayeredPane you add components on different layers. Each component is positionend exactly with setLocation or setBounds. This is the most exact thing to use. The JLayeredPane uses exact positioning of its components. which can be usefull when you use
several components that will be visible at different times
/Markus
Similar Messages
-
Help With JScrollPane and many JLabels...
I am in the process of designing an 'image browser' applet for a client, but am having some difficulty in deciding how I can most elegantly meet all of the requirements. The specification calls for an applet that can view up to 400 images (all images are small - 120 * 120 px), the view of the images can be scrolled (if not all are in the view) or scaled (zoom in and out on any area), and the images will need to 'animate' or move to new locations as sorting criteria changes. Also, I need to be able to group images into arbitrary n*n arrays and click on any image in the view (rollovers may also be necessary in the future).
At first, I thought this would be easily solved by putting the images (JLabels?) into as many groups (JPanels?) as necessary to meet the sort criteria, then adding the groups to my main view (JScrollPane w/JPanel) in a GridLayout. My current attempt at a solution scales the groups (JPanels) via. an overridden paintComponent method from within my main scrolling view (using g2d and scale). Unfortunately, I now have many problems that I am having trouble solving:
1. After I re-scale the JScrollPane (zoom in or out) and then try and scroll, the new images that scroll in are either garbled or just junk (seems like remnants of the original, non-scaled components?).
2. The scrollbars, at first, were not reflecting the current scaling and how much content is visible, so I overrode the getPreferredSize method in my JScrollPane content object to return (super.getPreferredSize * scaleFactor) - this fixes the appearance of the scroll bars (ie. they accurately reflect how much content there is), but it also offsets all of the images left depending on the scale value (less scale -> images offset further left).
3. I need pixel-perfect control over the images, so that I can animate the transition from one 'group' to another - I can't see a way to achieve this with my current solution.
Has anyone tried to do something like this before? What is a good way of accomplishing what I need here? Any code out there that does something similar? Any help would be appreciated, I've been banging my head against the wall over this for days now...
Thanks in advance,
Mike P.
Here is some relevant code:
/* From BrowserPanel (JPanel associated with my main JScrollPane) */
public void paint (Graphics g) {
Graphics2D g2d = (Graphics2D) g;
g2d.scale(scaleFactor, scaleFactor);
super.paint(g2d);
/* From BrowserPanel (JPanel associated with my main JScrollPane) */
public Dimension getPreferredSize() {
Dimension origSize = super.getPreferredSize();
double originalSizeX;
double originalSizeY;
originalSizeX = origSize.getWidth();
originalSizeY = origSize.getHeight();
double newSizeX = originalSizeX * scaleFactor;
double newSizeY = originalSizeY * scaleFactor;
String strX = Double.toString(newSizeX);
String strY = Double.toString(newSizeY);
/* Round the string (discard anything after the decimal) */
strX = strX.substring(0, strX.indexOf("."));
strY = strY.substring(0, strY.indexOf("."));
/* Convert string to int... */
int x = Integer.parseInt(strX);
int y = Integer.parseInt(strY);
return new Dimension(x, y);
}I increased the frame size to 3 lines and noticed the the flickering is a result of the text area painting itself without the scrollbar and then repainting itself with the scrollbar. I don't know why this happens, but a work around is to use:
ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS, -
Is there anyway to
1. Fix the size on JScrollPane area on the screen.
2. Enable only the vertical scrollbar.
So that user can scrolling vertically for the content within the specified Scroll Pane area.View Port width? Here is some code I copied from another posting:
import java.awt.*;
import javax.swing.*;
public class TestScrollableFlowPanel extends JFrame {
public static void main( String[] args ) {
Runnable doEDT = new Runnable() {
public void run() {
new TestScrollableFlowPanel();
SwingUtilities.invokeLater( doEDT );
public TestScrollableFlowPanel() {
try {
jbInit();
} catch ( Exception e ) {
e.printStackTrace();
this.setSize( 300, 300 );
this.setDefaultCloseOperation( EXIT_ON_CLOSE );
this.setVisible( true );
private void jbInit() throws Exception {
ScrollableFlowPanel panel = new ScrollableFlowPanel();
for ( int k = 0; k < 20; k++ )
panel.add( new JButton( "Button" + k ) );
JScrollPane scroll = new JScrollPane( panel );
this.getContentPane().setLayout( new BorderLayout() );
this.getContentPane().add( scroll, BorderLayout.CENTER );
// this.getContentPane().add( panel, BorderLayout.NORTH );
static public class ScrollableFlowPanel extends JPanel implements Scrollable {
public void setBounds( int x, int y, int width, int height ) {
super.setBounds( x, y, getParent().getWidth(), height );
public Dimension getPreferredSize() {
return new Dimension( getWidth(), getPreferredHeight() );
public Dimension getPreferredScrollableViewportSize() {
return super.getPreferredSize();
public int getScrollableUnitIncrement( Rectangle visibleRect, int orientation, int direction ) {
int hundredth = ( orientation == SwingConstants.VERTICAL
? getParent().getHeight() : getParent().getWidth() ) / 100;
return ( hundredth == 0 ? 1 : hundredth );
public int getScrollableBlockIncrement( Rectangle visibleRect, int orientation, int direction ) {
return orientation == SwingConstants.VERTICAL ? getParent().getHeight() : getParent().getWidth();
public boolean getScrollableTracksViewportWidth() {
return true;
public boolean getScrollableTracksViewportHeight() {
return false;
private int getPreferredHeight() {
int rv = 0;
for ( int k = 0, count = getComponentCount(); k < count; k++ ) {
Component comp = getComponent( k );
Rectangle r = comp.getBounds();
int height = r.y + r.height;
if ( height > rv )
rv = height;
rv += ( (FlowLayout) getLayout() ).getVgap();
System.out.println(rv);
return rv;
} -
Need help with JTextArea and Scrolling
import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;
import javax.swing.*;
public class MORT_RETRY extends JFrame implements ActionListener
private JPanel keypad;
private JPanel buttons;
private JTextField lcdLoanAmt;
private JTextField lcdInterestRate;
private JTextField lcdTerm;
private JTextField lcdMonthlyPmt;
private JTextArea displayArea;
private JButton CalculateBtn;
private JButton ClrBtn;
private JButton CloseBtn;
private JButton Amortize;
private JScrollPane scroll;
private DecimalFormat calcPattern = new DecimalFormat("$###,###.00");
private String[] rateTerm = {"", "7years @ 5.35%", "15years @ 5.5%", "30years @ 5.75%"};
private JComboBox rateTermList;
double interest[] = {5.35, 5.5, 5.75};
int term[] = {7, 15, 30};
double balance, interestAmt, monthlyInterest, monthlyPayment, monPmtInt, monPmtPrin;
int termInMonths, month, termLoop, monthLoop;
public MORT_RETRY()
Container pane = getContentPane();
lcdLoanAmt = new JTextField();
lcdMonthlyPmt = new JTextField();
displayArea = new JTextArea();//DEFINE COMBOBOX AND SCROLL
rateTermList = new JComboBox(rateTerm);
scroll = new JScrollPane(displayArea);
scroll.setSize(600,170);
scroll.setLocation(150,270);//DEFINE BUTTONS
CalculateBtn = new JButton("Calculate");
ClrBtn = new JButton("Clear Fields");
CloseBtn = new JButton("Close");
Amortize = new JButton("Amortize");//DEFINE PANEL(S)
keypad = new JPanel();
buttons = new JPanel();//DEFINE KEYPAD PANEL LAYOUT
keypad.setLayout(new GridLayout( 4, 2, 5, 5));//SET CONTROLS ON KEYPAD PANEL
keypad.add(new JLabel("Loan Amount$ : "));
keypad.add(lcdLoanAmt);
keypad.add(new JLabel("Term of loan and Interest Rate: "));
keypad.add(rateTermList);
keypad.add(new JLabel("Monthly Payment : "));
keypad.add(lcdMonthlyPmt);
lcdMonthlyPmt.setEditable(false);
keypad.add(new JLabel("Amortize Table:"));
keypad.add(displayArea);
displayArea.setEditable(false);//DEFINE BUTTONS PANEL LAYOUT
buttons.setLayout(new GridLayout( 1, 3, 5, 5));//SET CONTROLS ON BUTTONS PANEL
buttons.add(CalculateBtn);
buttons.add(Amortize);
buttons.add(ClrBtn);
buttons.add(CloseBtn);//ADD ACTION LISTENER
CalculateBtn.addActionListener(this);
ClrBtn.addActionListener(this);
CloseBtn.addActionListener(this);
Amortize.addActionListener(this);
rateTermList.addActionListener(this);//ADD PANELS
pane.add(keypad, BorderLayout.NORTH);
pane.add(buttons, BorderLayout.SOUTH);
pane.add(scroll, BorderLayout.CENTER);
addWindowListener( new WindowAdapter()
public void windowClosing(WindowEvent e)
System.exit(0);
public void actionPerformed(ActionEvent e)
String arg = lcdLoanAmt.getText();
int combined = Integer.parseInt(arg);
if (e.getSource() == CalculateBtn)
try
JOptionPane.showMessageDialog(null, "Got try here", "Error", JOptionPane.ERROR_MESSAGE);
catch(NumberFormatException ev)
JOptionPane.showMessageDialog(null, "Got here", "Error", JOptionPane.ERROR_MESSAGE);
if ((e.getSource() == CalculateBtn) && (arg != null))
try{
if ((e.getSource() == CalculateBtn) && (rateTermList.getSelectedIndex() == 1))
monthlyInterest = interest[0] / (12 * 100);
termInMonths = term[0] * 12;
monthlyPayment = combined * (monthlyInterest / (1 - (Math.pow (1 + monthlyInterest, -termInMonths))));
lcdMonthlyPmt.setText(calcPattern.format(monthlyPayment));
if ((e.getSource() == CalculateBtn) && (rateTermList.getSelectedIndex() == 2))
monthlyInterest = interest[1] / (12 * 100);
termInMonths = term[1] * 12;
monthlyPayment = combined * (monthlyInterest / (1 - (Math.pow (1 + monthlyInterest, -termInMonths))));
lcdMonthlyPmt.setText(calcPattern.format(monthlyPayment));
if ((e.getSource() == CalculateBtn) && (rateTermList.getSelectedIndex() == 3))
monthlyInterest = interest[2] / (12 * 100);
termInMonths = term[2] * 12;
monthlyPayment = combined * (monthlyInterest / (1 - (Math.pow (1 + monthlyInterest, -termInMonths))));
lcdMonthlyPmt.setText(calcPattern.format(monthlyPayment));
catch(NumberFormatException ev)
JOptionPane.showMessageDialog(null, "Invalid Entry!\nPlease Try Again", "Error", JOptionPane.ERROR_MESSAGE);
} //IF STATEMENTS FOR AMORTIZATION
if ((e.getSource() == Amortize) && (rateTermList.getSelectedIndex() == 1))
loopy(7, 5.35);
if ((e.getSource() == Amortize) && (rateTermList.getSelectedIndex() == 2))
loopy(15, 5.5);
if ((e.getSource() == Amortize) && (rateTermList.getSelectedIndex() == 3))
loopy(30, 5.75);
if (e.getSource() == ClrBtn)
rateTermList.setSelectedIndex(0);
lcdLoanAmt.setText(null);
lcdMonthlyPmt.setText(null);
displayArea.setText(null);
if (e.getSource() == CloseBtn)
System.exit(0);
private void loopy(int lTerm,double lInterest)
double total, monthly, monthlyrate, monthint, monthprin, balance, lastint, paid;
int amount, months, termloop, monthloop;
String lcd2 = lcdLoanAmt.getText();
amount = Integer.parseInt(lcd2);
termloop = 1;
paid = 0.00;
monthlyrate = lInterest / (12 * 100);
months = lTerm * 12;
monthly = amount *(monthlyrate/(1-Math.pow(1+monthlyrate,-months)));
total = months * monthly;
balance = amount;
while (termloop <= lTerm)
displayArea.setCaretPosition(0);
displayArea.append("\n");
displayArea.append("Year " + termloop + " of " + lTerm + ": payments\n");
displayArea.append("\n");
displayArea.append("Month\tMonthly\tPrinciple\tInterest\tBalance\n");
monthloop = 1;
while (monthloop <= 12)
monthint = balance * monthlyrate;
monthprin = monthly - monthint;
balance -= monthprin;
paid += monthly;
displayArea.setCaretPosition(0);
displayArea.append(monthloop + "\t" + calcPattern.format(monthly) + "\t" + calcPattern.format(monthprin) + "\t");
displayArea.append(calcPattern.format(monthint) + "\t" + calcPattern.format(balance) + "\n");
monthloop ++;
termloop ++;
public static void main(String args[])
MORT_RETRY f = new MORT_RETRY();
f.setTitle("MORTGAGE PAYMENT CALCULATOR");
f.setBounds(600, 600, 500, 500);
f.setLocationRelativeTo(null);
f.setVisible(true);
}need help with displaying the textarea correctly and the scroll bar please.
Message was edited by:
new2this2020What's the problem you're having ???
PS. -
URGENT! Need help with scrolling on a JPanel!
Hello Guys! I guess there has been many postings about this subject in the forum, but the postings I found there.... still couldn't solve my problem...
So, straight to the problem:
I am drawing some primitive graphic on a JPanel. This JPanel is then placed in a JScrollPane. When running the code, the scrollbars are showing and the graphic is painted nicely. But when I try to scroll to see the parts of the graphics not visible in the current scrollbarview, nothing else than some flickering is happening... No movement what so ever...
What on earth must I do to activate the scroll functionality on my JPanel??? Please Help!
And yes, I have tried implementing the 'Scrollable' interface... But it did not make any difference...
Code snippets:
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.awt.geom.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
import java.util.*;
public class FilterComp extends JPanel {//implements Scrollable {
protected DefaultMutableTreeNode root;
protected Image buffer;
protected int lastW = 0;
protected int origoX = 0;
protected final StringBuffer sb = new StringBuffer();
// protected int maxUnitIncrement = 1;
protected JScrollPane scrollpane = new JScrollPane();
* Constructor for the FilterComp object
*@param scrollpane Description of the Parameter
public FilterComp(JScrollPane scrollpane) {
super();
// setPreferredSize(new Dimension(1000, 500));
this.setBackground(Color.magenta);
// setOpaque(false);
setLayout(
new BorderLayout() {
public Dimension preferredLayoutSize(Container cont) {
return new Dimension(1000, 600);
this.scrollpane = scrollpane;
scrollpane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scrollpane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
scrollpane.setPreferredSize( new Dimension( 500, 500 ) );
scrollpane.getViewport().add( this, null );
// scrollpane.getViewport().setScrollMode(JViewport.SIMPLE_SCROLL_MODE);
repaint();
public void paintComponent(Graphics g) {
super.paintComponent(g);
int w = getSize().width;
if (w != lastW) {
buffer = null;
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
if (root != null) {
int h = getHeight(root);
if (buffer == null) {
buffer = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_ARGB);
Graphics2D g3 = (Graphics2D) buffer.getGraphics();
g3.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g3.setColor(Color.black);
g3.setStroke(new BasicStroke(2));
paint(g3, (w / 2) + origoX, 10, w / 2, root);
lastW = w;
AffineTransform old = g2.getTransform();
AffineTransform trans = new AffineTransform();
trans.translate((w / 2) + origoX, (getHeight() - (h * 40)) / 2);
g2.setTransform(trans);
g2.drawImage(buffer, (-w / 2) + origoX, 0, null);
g2.setTransform(old);
updateUI();
* Description of the Method
*@param g Description of the Parameter
public void update(Graphics g) {
// Call paint to reduce flickering
paint(g);
* Description of the Method
*@param g2 Description of the Parameter
*@param x Description of the Parameter
*@param y Description of the Parameter
*@param w Description of the Parameter
*@param node Description of the Parameter
private void paint(Graphics2D g2, int x, int y, int w, DefaultMutableTreeNode node) {
if (node.getChildCount() == 2) {
DefaultMutableTreeNode c1 = (DefaultMutableTreeNode) node.getChildAt(0);
DefaultMutableTreeNode c2 = (DefaultMutableTreeNode) node.getChildAt(1);
if (c1.getChildCount() == 0 && c2.getChildCount() == 0) {
String s = c1.getUserObject().toString() + " " + node.getUserObject() + " " + c2.getUserObject();
paint(g2, x, y, s);
} else {
g2.drawLine(x - (w / 2), y, x + (w / 2), y);
Font f = g2.getFont();
g2.setFont(new Font(f.getName(), Font.BOLD | Font.ITALIC, f.getSize() + 2));
paint(g2, x, y, node.getUserObject().toString());
g2.setFont(f);
g2.drawLine(x - (w / 2), y, x - (w / 2), y + 40);
g2.drawLine(x + (w / 2), y, x + (w / 2), y + 40);
paint(g2, x - (w / 2), y + 40, w / 2, c1);
paint(g2, x + (w / 2), y + 40, w / 2, c2);
} else if (node.getChildCount() == 0) {
paint(g2, x, y, node.getUserObject().toString());
* Description of the Method
*@param g2 Description of the Parameter
*@param x Description of the Parameter
*@param y Description of the Parameter
*@param s Description of the Parameter
private void paint(Graphics2D g2, int x, int y, String s) {
y += 10;
StringTokenizer st = new StringTokenizer(s, "\\", false);
if (s.indexOf("'") != -1 && st.countTokens() > 1) {
int sh = g2.getFontMetrics().getHeight();
while (st.hasMoreTokens()) {
String t = st.nextToken();
if (st.hasMoreTokens()) {
t += "/";
int sw = g2.getFontMetrics().stringWidth(t);
g2.drawString(t, x - (sw / 2), y);
y += sh;
} else {
int sw = g2.getFontMetrics().stringWidth(s);
g2.drawString(s, x - (sw / 2), y);
* Sets the root attribute of the FilterComp object
*@param root The new root value
public void setRoot(DefaultMutableTreeNode root) {
this.root = root;
buffer = null;
* Gets the root attribute of the FilterComp object
*@return The root value
public DefaultMutableTreeNode getRoot() {
return root;
* Gets the height attribute of the FilterComp object
*@param t Description of the Parameter
*@return The height value
private int getHeight(TreeNode t) {
int h = 1;
int c = t.getChildCount();
if (c > 0) {
if (c > 1) {
h += Math.max(getHeight(t.getChildAt(0)), getHeight(t.getChildAt(1)));
} else {
h += getHeight(t.getChildAt(0));
return h;
* Sets the x attribute of the FilterComp object
*@param x The new x value
public void setX(int x) {
origoX = x;
* Gets the x attribute of the FilterComp object
*@return The x value
public int getX() {
return origoX;
* Gets the preferredScrollableViewportSize attribute of the FilterComp
* object
*@return The preferredScrollableViewportSize value
// public Dimension getPreferredScrollableViewportSize() {
// return getPreferredSize();
* Gets the scrollableBlockIncrement attribute of the FilterComp object
*@param r Description of the Parameter
*@param orientation Description of the Parameter
*@param direction Description of the Parameter
*@return The scrollableBlockIncrement value
// public int getScrollableBlockIncrement(Rectangle r, int orientation, int direction) {
// return 10;
* Gets the scrollableTracksViewportHeight attribute of the FilterComp object
*@return The scrollableTracksViewportHeight value
// public boolean getScrollableTracksViewportHeight() {
// return false;
* Gets the scrollableTracksViewportWidth attribute of the FilterComp object
*@return The scrollableTracksViewportWidth value
// public boolean getScrollableTracksViewportWidth() {
// return false;
* Gets the scrollableUnitIncrement attribute of the FilterComp object
*@param r Description of the Parameter
*@param orientation Description of the Parameter
*@param direction Description of the Parameter
*@return The scrollableUnitIncrement value
// public int getScrollableUnitIncrement(Rectangle r, int orientation, int direction) {
// return 10;
}The Scrollable interface should be implemented by a JPanel set as the JScrollPane's viewport or scrolling may not function. Although it is said to be only necessary for tables, lists, and trees, without it I have never had success with images. Even the Java Swing Tutorial on scrolling images with JScrollPane uses the Scrollable interface.
I donot know what you are doing wrong here, but I use JScrollPane with a JPanel implementing Scrollable interface and it works very well scrolling images drawn into the JPanel.
You can scroll using other components, such as the JScrollBar or even by using a MouseListener/MouseMotionListener combination, but this is all done behind the scenes with the use of JScrollPane/Scrollable combination.
You could try this approach using an ImageIcon within a JLabel:
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
import javax.swing.event.*;
public class Test extends JFrame {
BufferedImage bi;
Graphics2D g_bi;
public Test() {
super("Scroll Test");
makeImage();
Container contentPane = getContentPane();
MyView view = new MyView(new ImageIcon(bi));
JScrollPane sp = new JScrollPane(view);
contentPane.add(sp);
setSize(200, 200);
setVisible(true);
private void makeImage() {
bi = new BufferedImage(320, 240, BufferedImage.TYPE_INT_ARGB);
g_bi = bi.createGraphics();
g_bi.setColor(Color.white);
g_bi.fillRect(0,0,320,240);
g_bi.setColor(Color.black);
g_bi.drawLine(0,0,320,240);
public static void main(String args[]) {
Test test = new Test();
class MyView extends JLabel {
ImageIcon icon;
public MyView(ImageIcon ii) {
super(ii);
icon = ii;
public void paintComponent(Graphics g) {
g.drawImage(icon.getImage(),0,0,this);
}Robert Templeton -
Need help with my addressbook program
hi,
i need help with my program here. this one should works as:
- saves user input into a txt file
- displays name of the saved person on the jlist whenever i run the program
- displays info about the person when clicked via textboxes given by reading the txt file where the user inputs are
- should scroll when the list exceeds the listbox
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.JList;
import java.awt.event.ActionListener;
import java.io.*;
import javax.swing.event.*;
import java.io.FilterInputStream;
public class AddressList extends JPanel implements ActionListener
JTextField txt1 = new JTextField();
JTextField txt2 = new JTextField();
JTextField txt3 = new JTextField();
DefaultListModel mdl = new DefaultListModel();
JList list = new JList();
JScrollPane listScroller = new JScrollPane(list);
ListSelectionModel listSelectionModel;
File fob = new File("Address3.txt");
String name;
char[] chars;
public void ListDisplay()
try
RandomAccessFile rand = new RandomAccessFile(fob,"rw");
BufferedReader br = new BufferedReader(new FileReader("Address3.txt"));
if(fob.exists())
while((name = rand.readLine()) != null)
chars = name.toCharArray();
if(chars[0] == '*')
mdl.addElement(name);
list.setModel(mdl);
if(chars[0] == '#')
continue;
else
System.out.println("No such file..");
catch(IOException a)
System.out.println(a.getMessage());
public AddressList()
this.setLayout(null);
listSelectionModel = list.getSelectionModel();
listSelectionModel.addListSelectionListener(new ListInfo());
list.setBounds(10,40,330,270);
listScroller.setBounds(320,40,20,100);
add(list);
add(listScroller);
JLabel lbl4 = new JLabel("Name: ");
lbl4.setBounds(400,10,80,30);
add(lbl4);
JLabel lbl5 = new JLabel("Cellphone #: ");
lbl5.setBounds(400,50,80,30);
add(lbl5);
JLabel lbl6 = new JLabel("Address: ");
lbl6.setBounds(400,90,80,30);
add(lbl6);
JLabel lbl7 = new JLabel("List ");
lbl7.setBounds(10,10,100,30);
add(lbl7);
txt1.setBounds(480,10,200,30);
add(txt1);
txt2.setBounds(480,50,200,30);
add(txt2);
txt3.setBounds(480,90,200,30);
add(txt3);
JButton btn1 = new JButton("Add");
btn1.setBounds(480,130,100,30);
btn1.addActionListener(this);
btn1.setActionCommand("Add");
add(btn1);
JButton btn2 = new JButton("Save");
btn2.setBounds(480,170,100,30);
btn2.addActionListener(this);
btn2.setActionCommand("Save");
add(btn2);
JButton btn3 = new JButton("Cancel");
btn3.setBounds(480,210,100,30);
btn3.addActionListener(this);
btn3.setActionCommand("Cancel");
add(btn3);
JButton btn4 = new JButton("Close");
btn4.setBounds(480,250,100,30);
btn4.addActionListener(this);
btn4.setActionCommand("Close");
add(btn4);
public static void main(String[]args)
JFrame frm = new JFrame("Address List");
AddressList panel = new AddressList();
frm.getContentPane().add(panel,"Center");
frm.setSize(700,350);
frm.setVisible(true);
panel.ListDisplay();
public void actionPerformed(ActionEvent e)
String cmd;
cmd = e.getActionCommand();
if(cmd.equals("Add"))
txt1.setText("");
txt2.setText("");
txt3.setText("");
else if(cmd.equals("Save"))
mdl.addElement(txt1.getText());
list.setModel(mdl);
try
RandomAccessFile rand = new RandomAccessFile(fob,"rw");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
LineNumberReader line = new LineNumberReader(br);
if(fob.exists())
rand.seek(fob.length());
rand.writeBytes("* " + txt1.getText());
rand.writeBytes("\r\n" + "# " + txt2.getText());
rand.writeBytes("\r\n" + "# " + txt3.getText() + "\r\n");
else
System.out.println("No such file..");
txt1.setText("");
txt2.setText("");
txt3.setText("");
catch(IOException a)
System.out.println(a.getMessage());
else if(cmd.equals("Cancel"))
txt1.setText("");
txt2.setText("");
txt3.setText("");
else if(cmd.equals("Close"))
System.exit(0);
class ListInfo implements ListSelectionListener
public void valueChanged(ListSelectionEvent e)
ListSelectionModel lsm = (ListSelectionModel)e.getSource();
int minIndex = lsm.getMinSelectionIndex();
int maxIndex = lsm.getMaxSelectionIndex();
try //*this one should display the info of the person whenever i click the person's name at the list box via textbox.. but i cant seem to get it right since it always display the info of the first person inputed.. i tried to get the program to display them whenever it reads lines with * on them....
File fob = new File("Address3.txt");
RandomAccessFile rand = new RandomAccessFile(fob,"rw");
BufferedReader br = new BufferedReader(new FileReader("Address3.txt"));
LineNumberReader line = new LineNumberReader(br);
if(fob.exists())
for(int i = minIndex; i<=maxIndex; i++)
if(lsm.isSelectedIndex(i))
while((name = rand.readLine()) != null)
chars = name.toCharArray();
if(chars[0] == '#')
continue;
if(chars[0] == '*')
txt1.setText(rand.readLine());
txt2.setText(rand.readLine());
txt3.setText(rand.readLine());
else
System.out.println("No such file..");
catch(IOException a)
System.out.println(a.getMessage());
}the only problem now is about how it should display the right info about the person whenever i click its name on the list.. something about file reading or something, i just cant figure it out.
and also about how to make it scroll once it exceeds the list.. i cant make it work, maybe something about wrong declaration..
thanks in advance..
Edited by: syder on Mar 14, 2008 2:26 AMLike said before, do one thing at a time. At startup, something like:
//put all the content in a list
ArrayList<String> lines = new ArrayList<String>();
while(String line=rand.readLine()!=null) {
lines.add(line);
}If you follow the good advice to create a class to encapsulate the entries, you could populate a list of such entries like this:
static final int ENTRY_SIZE = 3;//you have 3 fields now, better to have a constant if that changes
ArrayList<Entry> entries = new ArrayList<Entry>();
for(int i=0; i<lines.size(); i+=ENTRY_SIZE) {
Entry entry = new Entry(lines.get(i), lines.get(i+1), lines.get(i+2);
entries.add(newEntry);
}You could also do both of the above in one run, but I think you will understand better what's happening if you do one thing at a time.
If you don't want to put the entries in an encapsulating class, you can still access this without looping:
int listStartIdx = <desired_entry_index>*ENTRY_SIZE;
String att1 = lines.get(listStartIdx).substring(1);
String att2 = lines.get(listStartIdx+1).substring(1);
String att3 = lines.get(listStartIdx+2).substring(1); -
Please I need some help with a table
Hi All
I need some help with a table.
My table needs to hold prices that the user can update.
Also has a total of the column.
my question is if the user adds in a new price how can i pick up the value they have just entered and then add it to the total which will be the last row in the table?
I have a loop that gets all the values of the column, so I can get the total but it is when the user adds in a new value that I need some help with.
I have tried using but as I need to set the toal with something like total
totalTable.setValueAt(total, totalTable.getRowCount()-1,1); I end up with an infinite loop.
Can any one please advise on some way I can get this to work ?
Thanks for reading
CraigHi there camickr
thanks for the help the other day
this is my full code....
package printing;
import java.awt.*;
import java.awt.event.*;
import java.awt.print.*;
import javax.swing.*;
import javax.swing.table.*;
import java.text.DecimalFormat;
public class tablePanel
extends JDialog implements Printable {
BorderLayout borderLayout1 = new BorderLayout();
private boolean printing = false;
private Dialog1 dialog;
JPanel jPanel = new JPanel();
JTable table;
JScrollPane scrollPane1 = new JScrollPane();
DefaultTableModel model;
private String[] columnNames = {
private Object[][] data;
private String selectTotal;
private double total;
public tablePanel(Dialog1 dp) {
dp = dialog;
try {
jbInit();
catch (Exception exception) {
exception.printStackTrace();
public tablePanel() {
try {
jbInit();
catch (Exception exception) {
exception.printStackTrace();
private void jbInit() throws Exception {
jPanel.setLayout(borderLayout1);
scrollPane1.setBounds(new Rectangle(260, 168, 0, 0));
this.add(jPanel);
jPanel.add(scrollPane1, java.awt.BorderLayout.CENTER);
scrollPane1.getViewport().add(table);
jPanel.setOpaque(true);
newTable();
addToModel();
addRows();
setTotal();
public static void main(String[] args) {
tablePanel tablePanel = new tablePanel();
tablePanel.pack();
tablePanel.setVisible(true);
public void setTotal() {
total = 0;
int i = table.getRowCount();
for (i = 0; i < table.getRowCount(); i++) {
String name = (String) table.getValueAt(i, 1);
if (!"".equals(name)) {
if (i != table.getRowCount() - 1) {
double dt = Double.parseDouble(name);
total = total + dt;
String str = Double.toString(total);
table.setValueAt(str, table.getRowCount() - 1, 1);
super.repaint();
public void newTable() {
model = new DefaultTableModel(data, columnNames) {
table = new JTable() {
public Component prepareRenderer(TableCellRenderer renderer,
int row, int col) {
Component c = super.prepareRenderer(renderer, row, col);
if (printing) {
c.setBackground(getBackground());
else {
if (row % 2 == 1 && !isCellSelected(row, col)) {
c.setBackground(getBackground());
else {
c.setBackground(new Color(227, 239, 250));
if (isCellSelected(row, col)) {
c.setBackground(new Color(190, 220, 250));
return c;
table.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 2) {
if (e.getClickCount() == 1) {
if (table.getSelectedColumn() == 1) {
table.setTableHeader(null);
table.setModel(model);
scrollPane1.getViewport().add(table);
table.getColumnModel().getColumn(1).setCellRenderer(new TableRenderDollar());
public void addToModel() {
Object[] data = {
"Price", "5800"};
model.addRow(data);
public void addRows() {
int rows = 20;
for (int i = 0; i < rows; i++) {
Object[] data = {
model.addRow(data);
public void printOut() {
PrinterJob pj = PrinterJob.getPrinterJob();
pj.setPrintable(tablePanel.this);
pj.printDialog();
try {
pj.print();
catch (Exception PrintException) {}
public int print(Graphics g, PageFormat pageFormat, int pageIndex) throws PrinterException {
Graphics2D g2 = (Graphics2D) g;
g2.setColor(Color.black);
int fontHeight = g2.getFontMetrics().getHeight();
int fontDesent = g2.getFontMetrics().getDescent();
//leave room for page number
double pageHeight = pageFormat.getImageableHeight() - fontHeight;
double pageWidth = pageFormat.getImageableWidth();
double tableWidth = (double) table.getColumnModel().getTotalColumnWidth();
double scale = 1;
if (tableWidth >= pageWidth) {
scale = pageWidth / tableWidth;
double headerHeightOnPage = 16.0;
//double headerHeightOnPage = table.getTableHeader().getHeight() * scale;
//System.out.println("this is the hedder heigth " + headerHeightOnPage);
double tableWidthOnPage = tableWidth * scale;
double oneRowHeight = (table.getRowHeight() + table.getRowMargin()) * scale;
int numRowsOnAPage = (int) ( (pageHeight - headerHeightOnPage) / oneRowHeight);
double pageHeightForTable = oneRowHeight *numRowsOnAPage;
int totalNumPages = (int) Math.ceil( ( (double) table.getRowCount()) / numRowsOnAPage);
if (pageIndex >= totalNumPages) {
return NO_SUCH_PAGE;
g2.translate(pageFormat.getImageableX(), pageFormat.getImageableY());
//bottom center
g2.drawString("Page: " + (pageIndex + 1 + " of " + totalNumPages), (int) pageWidth / 2 - 35, (int) (pageHeight + fontHeight - fontDesent));
g2.translate(0f, headerHeightOnPage);
g2.translate(0f, -pageIndex * pageHeightForTable);
//If this piece of the table is smaller
//than the size available,
//clip to the appropriate bounds.
if (pageIndex + 1 == totalNumPages) {
int lastRowPrinted =
numRowsOnAPage * pageIndex;
int numRowsLeft =
table.getRowCount()
- lastRowPrinted;
g2.setClip(0,
(int) (pageHeightForTable * pageIndex),
(int) Math.ceil(tableWidthOnPage),
(int) Math.ceil(oneRowHeight *
numRowsLeft));
//else clip to the entire area available.
else {
g2.setClip(0,
(int) (pageHeightForTable * pageIndex),
(int) Math.ceil(tableWidthOnPage),
(int) Math.ceil(pageHeightForTable));
g2.scale(scale, scale);
printing = true;
try {
table.paint(g2);
finally {
printing = false;
//tableView.paint(g2);
g2.scale(1 / scale, 1 / scale);
g2.translate(0f, pageIndex * pageHeightForTable);
g2.translate(0f, -headerHeightOnPage);
g2.setClip(0, 0,
(int) Math.ceil(tableWidthOnPage),
(int) Math.ceil(headerHeightOnPage));
g2.scale(scale, scale);
//table.getTableHeader().paint(g2);
//paint header at top
return Printable.PAGE_EXISTS;
class TableRenderDollar extends DefaultTableCellRenderer{
public Component getTableCellRendererComponent(
JTable table,
Object value,
boolean isSelected,
boolean isFocused,
int row, int column) {
setHorizontalAlignment(SwingConstants.RIGHT);
Component component = super.getTableCellRendererComponent(
table,
value,
isSelected,
isFocused,
row,
column);
if( value == null || value .equals("")){
( (JLabel) component).setText("");
}else{
double number = 0.0;
number = new Double(value.toString()).doubleValue();
DecimalFormat df = new DecimalFormat(",##0.00");
( (JLabel) component).setText(df.format(number));
return component;
} -
Help with placing the JComponents at a particular location in JPanel
Hello All,
I think it is simple in placing JLabel with an icon or just just text at a particular location in the JPanel. But it is notworking. I know it is very simple but i think i am missing something. Here is code please help with this code.
Thanks
Smithaimport java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.LayoutManager;
import javax.swing.*;
public class DocumentGraphicalRepresentation {
public void buildDocumentation() {
JFrame frame = new JFrame("Graphical Representation");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setBounds(0, 0, 475, 265);
JPanel panel = new JPanel();
panel.setBounds(0, 0, 475, 265);
panel.setBackground(Color.lightGray);
//panel.setLayout(new BorderLayout());
JLabel label0 = new JLabel(new ImageIcon("c:/arrow.gif"));
label0.setLocation(61, 68);
label0.setOpaque(false);
panel.add(label0);
JLabel label1 = new JLabel(new ImageIcon("c:/bulb.gif"));
label1.setLocation(338, 139);
label1.setOpaque(false);
panel.add(label1);
frame.getContentPane().add(panel);
frame.setVisible(true);
public static void main(String args[]) {
DocumentGraphicalRepresentation document = new DocumentGraphicalRepresentation();
document.buildDocumentation();
}When adding components to a null layout you must set both a location and size for them to show up.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.LayoutManager;
import javax.swing.*;
public class DGR {
public void buildDocumentation() {
JFrame frame = new JFrame("Graphical Representation");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setBounds(0, 0, 475, 265);
JPanel panel = new JPanel();
panel.setBounds(0, 0, 475, 265);
panel.setBackground(Color.lightGray);
//panel.setLayout(new BorderLayout());
JLabel label0 = new JLabel(new ImageIcon(//"c:/arrow.gif"));
"images/geek/geek-----.gif"));
Dimension d = label0.getPreferredSize();
label0.setSize(d);
label0.setLocation(61, 68);
// label0.setOpaque(false);
panel.add(label0);
JLabel label1 = new JLabel(new ImageIcon(//"c:/bulb.gif"));
"images/hawk.jpg"));
d = label1.getPreferredSize();
label1.setBounds(338,139,d.width,d.height);
// label1.setLocation(338, 139);
System.out.println("label1.isOpaque = " + label1.isOpaque());
// label1.setOpaque(false);
panel.add(label1);
frame.getContentPane().add(new JScrollPane(panel));
frame.setVisible(true);
public static void main(String args[]) {
new DGR().buildDocumentation();
} -
Controlling amount of rows in a jtextfield with jscrollpane
As part of a school assignment, I we have output going to a textfield that is scrolled with JScrollPane. Part of it is for when it comes to 400 lines, and another line is added, that the first line of the output is erased, and the new one is added. Are there simple methods of the API to do this, or should I perhaps store all the output in a string, use an int to count, and then substring it to the first \n ?
Thanks for the replies. Please dont give me direct answers, but help to find the answer, as I do not want to cheat.While I did not do a SSCCE, mine is not overly complicated on output. The first part of this was building a console client to connect to a server. This part is adding a GUI to it, with a bit of extra functionality. My writeMessage method of the console did a System.out.println. It now does a output.setText(output.getText() + "\n"+ date + msg); msg being the String parameter in the method. output is the JTextArea I have, and is passed to my Client object.
The output works fine, its just trying to cut the first line out when max is reached. Just doing 20 lines for now. I tried adding this, but it started cutting more and more off the start of the text.
if(output.getLineCount() > 20) {
try {
int firstRow = output.getLineEndOffset(0);
output.setText(output.getText().substring(0, firstRow));
catch(BadLocationException e) {
e.printStackTrace();
}Edited by: agm_ultimatex on Jun 29, 2009 12:35 PM -
Error using JTextArea with JScrollPane
hi,
I am using JTextArea with JScrollpane. I am getting a problem in selecting the text in text area. I am searching for some text in the text area and selecting it if search successful. The problem is that the the scrollbar position didnt set to the correct location. So sometime the text selected is not visible in the scrolpane. Any help regarding this will be highly appreciated.
Regards
DanishWhat about sth like this:Rectangle r = textarea.modelToView(textarea.getSelectionStart());
scrollpane.scrollRectToVisible(r);Just a guess, no idea whether it works. -
Need help with a simple program (should be simple anyway)
I'm (starting to begin) writing a nice simple program that should be easy however I'm stuck on how to make the "New" button in the file menu clear all the fields. Any help? I'll attach the code below.
====================================================
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Message extends JFrame implements ActionListener {
public void actionPerformed(ActionEvent evt) {
text1.setText(" ");
text2.setText("RE: ");
text3.setText(" ");
public Message() {
super("Write a Message - by Kieran Hannigan");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(370,270);
FlowLayout flo = new FlowLayout(FlowLayout.RIGHT);
setLayout(flo);
//Make the bar
JMenuBar bar = new JMenuBar();
//Make "File" on Menu
JMenu File = new JMenu("File");
JMenuItem f1 = new JMenuItem("New");f1.addActionListener(this);
JMenuItem f2 = new JMenuItem("Open");
JMenuItem f3 = new JMenuItem("Save");
JMenuItem f4 = new JMenuItem("Save As");
JMenuItem f5 = new JMenuItem("Exit");
File.add(f1);
File.add(f2);
File.add(f3);
File.add(f4);
File.add(f5);
bar.add(File);
//Make "Edit" on menu
JMenu Edit = new JMenu("Edit");
JMenuItem e1 = new JMenuItem("Cut");
JMenuItem e2 = new JMenuItem("Paste");
JMenuItem e3 = new JMenuItem("Copy");
JMenuItem e4 = new JMenuItem("Repeat");
JMenuItem e5 = new JMenuItem("Undo");
Edit.add(e5);
Edit.add(e4);
Edit.add(e1);
Edit.add(e3);
Edit.add(e2);
bar.add(Edit);
//Make "View" on menu
JMenu View = new JMenu("View");
JMenuItem v1 = new JMenuItem("Bold");
JMenuItem v2 = new JMenuItem("Italic");
JMenuItem v3 = new JMenuItem("Normal");
JMenuItem v4 = new JMenuItem("Bold-Italic");
View.add(v1);
View.add(v2);
View.add(v3);
View.addSeparator();
View.add(v4);
bar.add(View);
//Make "Help" on menu
JMenu Help = new JMenu("Help");
JMenuItem h1 = new JMenuItem("Help Online");
JMenuItem h2 = new JMenuItem("E-mail Programmer");
Help.add(h1);
Help.add(h2);
bar.add(Help);
setJMenuBar(bar);
//Make Contents of window.
//Make "Subject" text field
JPanel row2 = new JPanel();
JLabel sublabel = new JLabel("Subject:");
row2.add(sublabel);
JTextField text2 = new JTextField("RE:",24);
row2.add(text2);
//Make "To" text field
JPanel row1 = new JPanel();
JLabel tolabel = new JLabel("To:");
row1.add(tolabel);
JTextField text1 = new JTextField(24);
row1.add(text1);
//Make "Message" text area
JPanel row3 = new JPanel();
JLabel Meslabel = new JLabel("Message:");
row3.add(Meslabel);
JTextArea text3 = new JTextArea(6,22);
messagearea.setLineWrap(true);
messagearea.setWrapStyleWord(true);
JScrollPane scroll = new JScrollPane(text3,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
//SpaceLine
JPanel spaceline = new JPanel();
JLabel spacer = new JLabel(" ");
spaceline.add(spacer);
row3.add(scroll);
add(row1);
add(row2);
add(spaceline);
add(spaceline);
add(row3);
setVisible(true);
public static void main(String[] arguments) {
Message Message = new Message();
}persiandude wrote:
Topic: Need help with if, else, and which statements and loops.
How would I display 60 < temp. <= 85 in java
System.out.println("60 < temp. <= 85 in java");
another question is how do I ask a question like want to try again (y/n) after a output and asking that everytime I type in yes after a output and terminate when saying No.Sun's [basic Java tutorial|http://java.sun.com/docs/books/tutorial/]
Sun's [New To Java Center|http://java.sun.com/learning/new2java/index.html].Includes an overview of what Java is, instructions for setting up Java, an intro to programming (that includes links to the above tutorial or to parts of it), quizzes, a list of resources, and info on certification and courses.
[http://javaalmanac.com|http://javaalmanac.com]. A couple dozen code examples that supplement [The Java Developers Almanac|http://www.amazon.com/exec/obidos/tg/detail/-/0201752808?v=glance].
jGuru. A general Java resource site. Includes FAQs, forums, courses, more.
JavaRanch. To quote the tagline on their homepage: "a friendly place for Java greenhorns." FAQs, forums (moderated, I believe), sample code, all kinds of goodies for newbies. From what I've heard, they live up to the "friendly" claim.
Bruce Eckel's [Thinking in Java|http://mindview.net/Books/DownloadSites] (Available online.)
Joshua Bloch's [Effective Java|http://www.amazon.com/Effective-Java-2nd-Joshua-Bloch/dp/0321356683/ref=pd_bbs_1?ie=UTF8&s=books&qid=1214349768&sr=8-1]
Bert Bates and Kathy Sierra's [Head First Java|http://www.amazon.com/exec/obidos/tg/detail/-/0596004656?v=glance].
James Gosling's [The Java Programming Language|http://www.bookpool.com/sm/0321349806]. -
Would love some help with this one.. I am new so please bare with me. This app just reads contents of a txt file. What I am trying to add is the ability to display an image inside the program frame with scrolls bars.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
public class Viewer extends JFrame
private JMenuBar menuBar;
private JMenu fileMenu;
private JMenu fontMenu;
private JMenuItem newItem;
private JMenuItem openItem;
private JMenuItem saveItem;
private JMenuItem saveAsItem;
private JMenuItem exitItem;
private JRadioButtonMenuItem monoItem;
private JRadioButtonMenuItem serifItem;
private JRadioButtonMenuItem sansSerifItem;
private JCheckBoxMenuItem italicItem;
private JCheckBoxMenuItem boldItem;
private String filename;
private JTextArea editorText;
private JLabel label;
private final int NUM_LINES = 20;
private final int NUM_CHARS = 40;
public Viewer()
setTitle("Viewer");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
editorText = new JTextArea(NUM_LINES, NUM_CHARS);
editorText.setLineWrap(true);
editorText.setWrapStyleWord(true);
JScrollPane scrollPane = new JScrollPane(editorText);
add(scrollPane);
buildMenuBar();
pack();
setVisible(true);
private void buildMenuBar()
buildFileMenu();
buildFontMenu();
menuBar = new JMenuBar();
menuBar.add(fileMenu);
menuBar.add(fontMenu);
setJMenuBar(menuBar);
private void buildFileMenu()
newItem = new JMenuItem("New");
newItem.setMnemonic(KeyEvent.VK_N);
newItem.addActionListener(new NewListener());
openItem = new JMenuItem("Open");
openItem.setMnemonic(KeyEvent.VK_O);
openItem.addActionListener(new OpenListener());
saveItem = new JMenuItem("Save");
saveItem.setMnemonic(KeyEvent.VK_S);
saveItem.addActionListener(new SaveListener());
saveAsItem = new JMenuItem("Save As");
saveAsItem.setMnemonic(KeyEvent.VK_A);
saveAsItem.addActionListener(new SaveListener());
exitItem = new JMenuItem("Exit");
exitItem.setMnemonic(KeyEvent.VK_X);
exitItem.addActionListener(new ExitListener());
fileMenu = new JMenu("File");
fileMenu.setMnemonic(KeyEvent.VK_F);
fileMenu.add(newItem);
fileMenu.add(openItem);
fileMenu.addSeparator();
fileMenu.add(saveItem);
fileMenu.add(saveAsItem);
fileMenu.addSeparator();
fileMenu.add(exitItem);
private void buildFontMenu()
monoItem = new JRadioButtonMenuItem("Monospaced");
monoItem.addActionListener(new FontListener());
serifItem = new JRadioButtonMenuItem("Serif");
serifItem.addActionListener(new FontListener());
sansSerifItem =
new JRadioButtonMenuItem("SansSerif", true);
sansSerifItem.addActionListener(new FontListener());
ButtonGroup group = new ButtonGroup();
group.add(monoItem);
group.add(serifItem);
group.add(sansSerifItem);
italicItem = new JCheckBoxMenuItem("Italic");
italicItem.addActionListener(new FontListener());
boldItem = new JCheckBoxMenuItem("Bold");
boldItem.addActionListener(new FontListener());
fontMenu = new JMenu("Font");
fontMenu.setMnemonic(KeyEvent.VK_T);
fontMenu.add(monoItem);
fontMenu.add(serifItem);
fontMenu.add(sansSerifItem);
fontMenu.addSeparator();
fontMenu.add(italicItem);
fontMenu.add(boldItem);
private class NewListener implements ActionListener
public void actionPerformed(ActionEvent e)
editorText.setText("");
filename = null;
private class OpenListener implements ActionListener
public void actionPerformed(ActionEvent e)
int chooserStatus;
JFileChooser chooser = new JFileChooser();
chooserStatus = chooser.showOpenDialog(null);
if (chooserStatus == JFileChooser.APPROVE_OPTION)
File selectedFile = chooser.getSelectedFile();
filename = selectedFile.getPath();
if (!openFile(filename))
JOptionPane.showMessageDialog(null,
"Error reading " +
filename, "Error",
JOptionPane.ERROR_MESSAGE);
private boolean openFile(String filename)
boolean success;
String inputLine, editorString = "";
FileReader freader;
BufferedReader inputFile;
label = new JLabel();
add(label);
try
freader = new FileReader(filename);
inputFile = new BufferedReader(freader);
inputLine = inputFile.readLine();
while (inputLine != null)
editorString = editorString +
inputLine + "\n";
inputLine = inputFile.readLine();
editorText.setText(editorString);
inputFile.close();
success = true;
catch (IOException e)
success = false;
return success;
private class SaveListener implements ActionListener
public void actionPerformed(ActionEvent e)
int chooserStatus;
if (e.getActionCommand() == "Save As" ||
filename == null)
JFileChooser chooser = new JFileChooser();
chooserStatus = chooser.showSaveDialog(null);
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Viewer ve = new Viewer();
}I tried using JLabel() but I cant seem to make it work. Whenever i browse and select a .jpg it displays "�������t���o\�[��+�p��B3�+�p��B3�"In the future, Swing related questions should be posted in the Swing forum.
Whenever i browse and select a .jpg it displays "�������t���o\�[��+�p��B3�+�p��B3�" You can read in a jpg file and treat it like a text file.
Read the Swing tutorial on [url http://java.sun.com/docs/books/tutorial/uiswing/components/icon.html]How to Use Icons for the proper way to read images. -
Urgently need some help with a few Swing questions
Hi
I'm hoping someone can help me, I need to get these problems fixed very soon or I'm in trouble.
Scenario: I have a JTreeTable inside a JScrollPane inside a JPanel that is inside a JFrame.
Problems I'm having (solutions or help with any of all would be greatly appreciated):
1. I'm trying to make it possible to do a selection in the JTreeTable by right-clicking the mouse (as well as the normal left click), but only if there is nothing currently selected, so I do something like this:
int[] sel = treeTable.getSelectedRows();
if ((sel == null) || (sel.length == 0)) {
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treeTable.setRowSelectionAllowed(true);
treeTable.setRowSelectionInterval(0, 0); // but I don't know what these values should be set to, where to get them from?
}I want to select the row at the mouse cursor, I have the x/y values but I don't know how to relate them to the row index. The full feature that I require is I need
2. I have a popup menu that appears after a right click on the JTreeTable, it's handled by a MouseListener attached to the JTreeTable, I want this to also appear anywhere else in the JScrollpane. I've tried moving the MouseListener to the JScrollPane, but then the popup stops working if user clicks inside JTreeTable, if I add it to both, it almost works, except that user cannot click below the JTreeTable's first column. Any ideas on this?
3. How can I change the JTreeTable selection behaviour so that you can only multi-select using Ctrl/Shift and not the mouse? Mouse must only allow single connection, I'm currently using:
treeTable.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);But this allows mouse drag selection as well, which shouldn't be there. How is this avoidable?
4. I want to make the minimize button to make an icon in system tray and be able to restore it by clicking on it. Also I want to be able to minimze from a popup menu, I've currently got the following:
thisApp.getMainFrame().setState(Frame.ICONIFIED);
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thisApp.getMainFrame().pack();
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}thisApp is a copy of the SingleFrameApplication variable that is passed to the main frame constructor (main frame extends FrameView). This code above doesn't do anything except create the tray icon. If I click on the tray icon (code below) then it opens up a blank window:
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LionelIssue 2 has been solved, was an error in the MouseListener code.
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Help with if statement in cursor and for loop to get output
I have the following cursor and and want to use if else statement to get the output. The cursor is working fine. What i need help with is how to use and if else statement to only get the folderrsn that have not been updated in the last 30 days. If you look at the talbe below my select statement is showing folderrs 291631 was updated only 4 days ago and folderrsn 322160 was also updated 4 days ago.
I do not want these two to appear in my result set. So i need to use if else so that my result only shows all folderrsn that havenot been updated in the last 30 days.
Here is my cursor:
/*Cursor for Email procedure. It is working Shows userid and the string
You need to update these folders*/
DECLARE
a_user varchar2(200) := null;
v_assigneduser varchar2(20);
v_folderrsn varchar2(200);
v_emailaddress varchar2(60);
v_subject varchar2(200);
Cursor c IS
SELECT assigneduser, vu.emailaddress, f.folderrsn, trunc(f.indate) AS "IN DATE",
MAX (trunc(fpa.attemptdate)) AS "LAST UPDATE",
trunc(sysdate) - MAX (trunc(fpa.attemptdate)) AS "DAYS PAST"
--MAX (TRUNC (fpa.attemptdate)) - TRUNC (f.indate) AS "NUMBER OF DAYS"
FROM folder f, folderprocess fp, validuser vu, folderprocessattempt fpa
WHERE f.foldertype = 'HJ'
AND f.statuscode NOT IN (20, 40)
AND f.folderrsn = fp.folderrsn
AND fp.processrsn = fpa.processrsn
AND vu.userid = fp.assigneduser
AND vu.statuscode = 1
GROUP BY assigneduser, vu.emailaddress, f.folderrsn, f.indate
ORDER BY fp.assigneduser;
BEGIN
FOR c1 IN c LOOP
IF (c1.assigneduser = v_assigneduser) THEN
dbms_output.put_line(' ' || c1.folderrsn);
else
dbms_output.put(c1.assigneduser ||': ' || 'Overdue Folders:You need to update these folders: Folderrsn: '||c1.folderrsn);
END IF;
a_user := c1.assigneduser;
v_assigneduser := c1.assigneduser;
v_folderrsn := c1.folderrsn;
v_emailaddress := c1.emailaddress;
v_subject := 'Subject: Project for';
END LOOP;
END;
The reason I have included the folowing table is that I want you to see the output from the select statement. that way you can help me do the if statement in the above cursor so that the result will look like this:
emailaddress
Subject: 'Project for ' || V_email || 'not updated in the last 30 days'
v_folderrsn
v_folderrsn
etc
[email protected]......
Subject: 'Project for: ' Jim...'not updated in the last 30 days'
284087
292709
[email protected].....
Subject: 'Project for: ' Kim...'not updated in the last 30 days'
185083
190121
190132
190133
190159
190237
284109
286647
294631
322922
[email protected]....
Subject: 'Project for: Joe...'not updated in the last 30 days'
183332
183336
[email protected]......
Subject: 'Project for: Sam...'not updated in the last 30 days'
183876
183877
183879
183880
183881
183882
183883
183884
183886
183887
183888
This table is to shwo you the select statement output. I want to eliminnate the two days that that are less than 30 days since the last update in the last column.
Assigneduser....Email.........Folderrsn...........indate.............maxattemptdate...days past since last update
JIM......... jim@ aol.com.... 284087............. 9/28/2006.......10/5/2006...........690
JIM......... jim@ aol.com.... 292709............. 3/20/2007.......3/28/2007............516
KIM......... kim@ aol.com.... 185083............. 8/31/2004.......2/9/2006............. 928
KIM...........kim@ aol.com.... 190121............. 2/9/2006.........2/9/2006.............928
KIM...........kim@ aol.com.... 190132............. 2/9/2006.........2/9/2006.............928
KIM...........kim@ aol.com.... 190133............. 2/9/2006.........2/9/2006.............928
KIM...........kim@ aol.com.... 190159............. 2/13/2006.......2/14/2006............923
KIM...........kim@ aol.com.... 190237............. 2/23/2006.......2/23/2006............914
KIM...........kim@ aol.com.... 284109............. 9/28/2006.......9/28/2006............697
KIM...........kim@ aol.com.... 286647............. 11/7/2006.......12/5/2006............629
KIM...........kim@ aol.com.... 294631............. 4/2/2007.........3/4/2008.............174
KIM...........kim@ aol.com.... 322922............. 7/29/2008.......7/29/2008............27
JOE...........joe@ aol.com.... 183332............. 1/28/2004.......4/23/2004............1585
JOE...........joe@ aol.com.... 183336............. 1/28/2004.......3/9/2004.............1630
SAM...........sam@ aol.com....183876.............3/5/2004.........3/8/2004.............1631
SAM...........sam@ aol.com....183877.............3/5/2004.........3/8/2004.............1631
SAM...........sam@ aol.com....183879.............3/5/2004.........3/8/2004.............1631
SAM...........sam@ aol.com....183880.............3/5/2004.........3/8/2004.............1631
SAM...........sam@ aol.com....183881.............3/5/2004.........3/8/2004.............1631
SAM...........sam@ aol.com....183882.............3/5/2004.........3/8/2004.............1631
SAM...........sam@ aol.com....183883.............3/5/2004.........3/8/2004.............1631
SAM...........sam@ aol.com....183884.............3/5/2004.........3/8/2004............ 1631
SAM...........sam@ aol.com....183886.............3/5/2004.........3/8/2004............ 1631
SAM...........sam@ aol.com....183887.............3/5/2004.........3/8/2004............ 1631
SAM...........sam@ aol.com....183888.............3/5/2004.........3/8/2004............ 1631
PAT...........pat@ aol.com.....291630.............2/23/2007.......7/8/2008............ 48
PAT...........pat@ aol.com.....313990.............2/27/2008.......7/28/2008............28
NED...........ned@ aol.com.....190681.............4/4/2006........8/10/2006............746
NED...........ned@ aol.com......95467.............6/14/2006.......11/6/2006............658
NED...........ned@ aol.com......286688.............11/8/2006.......10/3/2007............327
NED...........ned@ aol.com.....291631.............2/23/2007.......8/21/2008............4
NED...........ned@ aol.com.....292111.............3/7/2007.........2/26/2008............181
NED...........ned@ aol.com.....292410.............3/15/2007.......7/22/2008............34
NED...........ned@ aol.com.....299410.............6/27/2007.......2/27/2008............180
NED...........ned@ aol.com.....303790.............9/19/2007.......9/19/2007............341
NED...........ned@ aol.com.....304268.............9/24/2007.......3/3/2008............ 175
NED...........ned@ aol.com.....308228.............12/6/2007.......12/6/2007............263
NED...........ned@ aol.com.....316689.............3/19/2008.......3/19/2008............159
NED...........ned@ aol.com.....316789.............3/20/2008.......3/20/2008............158
NED...........ned@ aol.com.....317528.............3/25/2008.......3/25/2008............153
NED...........ned@ aol.com.....321476.............6/4/2008.........6/17/2008............69
NED...........ned@ aol.com.....322160.............7/3/2008.........8/21/2008............4
MOE...........moe@ aol.com.....184169.............4/5/2004.......12/5/2006............629
[email protected]/27/2004.......3/8/2004............1631
How do I incorporate a if else statement in the above cursor so the two days less than 30 days since last update are not returned. I do not want to send email if the project have been updated within the last 30 days.
Edited by: user4653174 on Aug 25, 2008 2:40 PManalytical functions: http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96540/functions2a.htm#81409
CASE
http://download.oracle.com/docs/cd/B10501_01/appdev.920/a96624/02_funds.htm#36899
http://download.oracle.com/docs/cd/B10501_01/appdev.920/a96624/04_struc.htm#5997
Incorporating either of these into your query should assist you in returning the desired results. -
I installed Sunbird in one computer and my calendar has all my infos, events, and task that i would like to see on another computer that i just downloaded Sunbird into. Also, is it possible I can access Sunbird on my iphone?
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