How to add objects to panel from another class?
Hi this is what i am trying to do. I have a drag and adrop tool working where the users and select objects on a small panel and drag them to another panel called the tpan. What i want to do is create another class, which creates objects and now i want to display these objects on the tpan. So say i have a class DisplayTpan(), this class is used to display the objects which have been dragged from the small panel, and objects on this panel have mouselisteners attached, so that these objects can be moved around on the tpan. I have created another class called creatObj(), and from this class i want to add objects to the tpan. The DisplayTpan class extends a Jpanel, would this be he case for the CreateObj() class? In the CreateClass i have made a call to DisplayTpan t = new DisplayTPan();
t.add(object);
But this does not add the object to the panel, any ideas on how it should be done?
Problem number two i have is say, I have two objects created on that oanel, i now want to draw a line t connect the two objects, this is just simply a call to the drawLine function but how would it be possible to add a ,mouselistener to that line, so it can be extended moved around etc? Any help much appreciated thanks.
As for your first problem...too confusing...too tired...mb tomorrow it will make sense :)
Fer the second...no need to add a mouse listener to each line. There are a couple options that spring to mind, the easiest I can think of is just check to see if the mouse click intersects with any of the lines (bit of geometry).
The second, ugly but a hella allot more accurate and better (me thinks), is to create a bounding box around the line, so the user doesn't have to click right right on the line. I created this bounding box by painting the pixels with a special key to correspond to that line. The other nice thing about this key is the fact that the lookup is quick.
The first step was the create a array of integers the size of the surface. Whenever a line is drawn on the graphical surface, do a corresponding line in the integer array, and create the bounding box inside this invisible array. Now whenever the user clicks just do a lookup into this array and check to see which line was selected...then go to town.
If you want a more detailed explination, i'll post some code later.
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I am new to Java so forgive me if this is confusing, or if I seem to be taking an overly complex route to acheiving my goal.
I've got a JTextArea component added to a JPanel object, which is then inserted into the JFrame. I have a JMenuBar with a JMenu "file" and a JMenuItem "connect" on this same JFrame. When clicked, the actionEvent of JMenuItem "connect" calls a class "ConnectToDb" to establish a connection with the Database. On a successful connection, I want to append the String "Connection Successful" to the JTextArea component, but since the component is a part of the JPanel object, I cannot seem to get access to the JTextArea component to update it. I tried instantiating the JPanel object from within the "ConnectToDb" class and then called a method I created to set the JTextArea. No luck. Can someone give me an idea of what I need to do that would allow me to update the text of the JTextArea component from anywhere in my program? Once it has been contained in the JPanel or JFrame, can it be updated?
This is the class that establishes the simple Db Connection
package cjt;
import java.io.*;
import java.sql.*;
* Get a database connection
* Creation date: (04/01/2002 4:08:39 PM)
* @author: Yaffin
public class ConnectToDB {
public Connection dbConnection;
// ConnectToDB constructor
public ConnectToDB() {
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} catch (ClassNotFoundException cnfe) {
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} catch (SQLException sqle) {
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package cjt;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
* Build Welcome Pane
* Creation date: (04/01/2002 3:42:50 PM)
* @author: yaffin
public class WelcomePane extends JPanel {
private JTextArea ivjtxtConnect = null;
private JLabel ivjwelcomeLbl = null;
private JTextArea ivjStatusArea = null;
* WelcomePane constructor comment.
public WelcomePane() {
super();
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private javax.swing.JTextArea getStatusArea() {
if (ivjStatusArea == null) {
try {
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ivjStatusArea.setWrapStyleWord(true);
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ivjStatusArea.setEditable(false);
// user code begin {1}
// user code end
} catch (java.lang.Throwable ivjExc) {
// user code begin {2}
// user code end
handleException(ivjExc);
return ivjStatusArea;
* Initialize the class.
private void initialize() {
try {
// user code begin {1}
// user code end
setName("WelcomePane");
setLayout(null);
setSize(514, 323);
add(getStatusArea(), getStatusArea().getName());
} catch (java.lang.Throwable ivjExc) {
handleException(ivjExc);
// user code begin {2}
// user code end
This is the main class where evrything is brought together. Notice the BuildMenu() method where the JMenuItem "connect" is located. Also notice the PopulateTabbedPane() method where WelcomePane() is first instantiated.
* The main application window
* Creation date: (04/01/2002 1:31:20 PM)
* @author: Yaffin
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* Creation date: (04/01/2002 2:42:54 PM)
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System.exit(0);
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menu.add(item1);
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menubar.add(menu);
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setJMenuBar(menubar);
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public static void main(String[] args) {
CjtApp mainWindow = new CjtApp();
mainWindow.setSize(640, 480);
mainWindow.setBackground(Color.white);
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mainWindow.setLocation(25, 25);
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private void populateTabbedPane(Connection dbconn) {
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tabbedPane.addTab(
"Welcome",
null,
new WelcomePane(),
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tabbedPane.addTab(
"Processing",
null,
new ProcessPane(dbc),
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tabbedPane.addTab(
"Reporting",
null,
new ReportPane(),
"Click here for reports");
//End
Thanks for any assistance you can provide.
YaffinThanks gmaurice1. I appreciate the response. I believe I understand your explanation. I am clear that the calling code needs access to the WelcomPane() object. I am assuming that the constructor for the calling class must have the JPanel WelcomePane() instance passed to it as an argument. This way I can refer directly to this specific instance of the object. Is this correct?
Also, where would you create the set method? I tried to create a set method as part of the WelcomePane() class, and then call it from the calling class, but it didn't seem to work. Lastly, a globally accessible object? Can you explain this concept briefly? Thanks again for your help.
yaffin -
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