JTextPane with scrollbar

Why are you creating an array of text panes.

1) Create a single text pane

2) Create a JScrollPane using the text pane as a parameter

3) add the scroll pane to the GUI.

The scrollbars will only appear when you add data to the text pane. So keep hitting the enter key to add blank line to the text pane and you will see the scrollbars eventually appear.

camickra at 2007-7-9 5:45:48 >

Yes, it has something to do with getContentPane().

In your for-statement you add the scrollPane to the frame's contentPane. And later you add your JTabbedPane to the contentPane, that's why you cannot see the scrollPane and the TextPane. So you should first decide what you want to add to your frame. Is it the JTabbedPane or the JScrollPane?

I guess you want to create a JTabbedPane with JTextPane in a JScrollPanes on every tab. So take a look at this:

import java.awt.BorderLayout;

import javax.swing.JFrame;

import javax.swing.JScrollPane;

import javax.swing.JTabbedPane;

import javax.swing.JTextPane;

class TextPanel{

private JTabbedPanetabbPane;

private int tabbLimit = 20;

private JTextPane[] jtp = new JTextPane[tabbLimit];

public TextPanel(){

JFrameframe = new JFrame("TextEditor");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setSize(600, 400);

tabbPane = new JTabbedPane();

for(int i = 0; i < jtp.length; i++){

jtp[i] = new JTextPane();

JScrollPane paneScrollPane = new JScrollPane(jtp[i]);

paneScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);

tabbPane.addTab("Tab " + i, null, jtp[i], "Tab " + i);

}

frame.setLayout(new BorderLayout());

frame.add(tabbPane, "Center");

frame.setVisible(true);

}

public static void main (String[] args){

new TextPanel();

}

}

the12huntersa at 2007-7-9 5:45:48 >

>I guess you want to create a JTabbedPane with JTextPane in a JScrollPanes

>on every tab

That is as true as it is said.. But what you made didnt help :/ you only added all the tabs which aint needed.. In my other version of this I add tabbs when needed through menus..

But your example didnt help with the scrollpane with was the real problem.. Atleast it doesnt seems so when I tryed out the code.

Prigasa at 2007-7-9 5:45:48 >

> frame.getContentPane().setLayout(new BorderLayout());

The default LayoutManager for a frame is a BorderLayout, so that line of code is not required.

> frame.getContentPane().add(tabbPane, "Center");

The default position for adding a component is the center, so the "Center" constraint is not required.

If you do specify the constraint then you should use the defined variable:

BorderLayout.CENTER

camickra at 2007-7-9 5:45:48 >

> >frame.getContentPane().setLayout(new

> BorderLayout());

> >frame.getContentPane().add(tabbPane, "Center");

>

>

> What exactly does that mean?

>

Yes, camickr, what does that mean? I was wondering why you have to add components to the contentPane of the JFrame. And I found in the API:

As a conveniance add and its variants, remove and setLayout have been overridden to forward to the contentPane as necessary. This means you can write:

frame.add(child);

And the child will be added to the contentPane.

since when can you do so? I had always in mind to NEVER add some components to a JFrame, but to its contentPane. Am I living in the stone age? I could have saved a lot of getContentPane()-typing in my life, if I knew this before!

the12huntersa at 2007-7-9 5:45:48 >

i have been observing your conversation and intend to tell my trouble. I am also having a problem of some sort while retriving the JTextPane associated to the tabbedpane with changelistener

ChangeListener changed=new ChangeListener(){

public void stateChanged(ChangeEvent chevent){

JTabbedPane source=(JTabbedPane)chevent.getSource();

int index=source.getSelectedIndex();

JTextPane area=(JTextPane)textPanecontainer.get(source.getTitleAt(index));//problem here

//textPanecontainer is a hashmap where key is tabname and value the associted textpane

area.addMouseListener(pop);

scPan=creatarea(area);//scPan is a scrollpane

frame.setJMenuBar(createMenuBar(area));

frame.add(popup);

frame.setContentPane(createContentPane(area) );

frame.addWindowListener(new AppCloser());

frame.setSize(600, 500);

frame.setVisible(true);

System.out.println("tab changed to"+source.getTitleAt(index));

System.out.println(textPanecontainer.get(source.getTitleAt(index)));

ArrayList keys=new ArrayList(textPanecontainer.keySet());

Iterator i=keys.iterator();

int j=0,k=0;

k=textPanecontainer.size();

System.out.println("size=:"+k);

while(i.hasNext()){

j++;

System.out.println("keys:");

System.out.println(i.next()+" ");

System.out.println("values:");

System.out.println(textPanecontainer.get(i.next()));

System.out.println('\n');

}

System.out.println("no of keys:"+j);

}

};

the problem is that when i retrieve the jtextpane associated with the hashmap textpancontainer i cannot associate other functionalities like actions to the jtextpane.

following is the code for creating the new tabs and how it is associated to the textpane throgh the hashmap textpancontainer.

class NewTabAction extends AbstractAction{

NewTabAction(){

super("NewTab");

}

public void actionPerformed(ActionEvent e) {

count=count+1;

JTextPane area=creatPane();

scPan=creatarea(area);

jt.addTab("tab"+count,scPan);

textPanecontainer.put("tab"+count, area);

}

}

I am running out of ideas . please help

bhargava at 2007-7-9 5:45:48 >