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JFrame resize problem

Posted on 2007-03-28
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Last Modified: 2008-01-09
I am creating the function when the user resizes the JFrame, I would like the few components to auto-locate to fit the size.

Well, it works fine the first time the user resized the JFrame, it fit correctly. However, the second time they resized the JFrame, seems like all the components get back to the original width and height again (before my 1st resize) so my 2nd resize becomes inaccurate.

I used NetBeans and my codes look like below.

    private void formComponentResized(java.awt.event.ComponentEvent evt) {                                      
        int newHeight = evt.getComponent().getHeight();
        int newWidth = evt.getComponent().getWidth();
       
        int diffHeight = newHeight - originalHeight;
        int diffWidth = newWidth - originalWidth;
       
        System.out.println("jPanel1.getHeight() = " + jPanel1.getHeight());

        if (diffHeight >= 0) {
            jPanel1.setBounds(jPanel1.getX(), jPanel1.getY(), jPanel1.getWidth(), jPanel1.getHeight() + diffHeight);            
        }
        else {            
            jPanel1.setBounds(jPanel1.getX(), jPanel1.getY(), jPanel1.getWidth(), jPanel1.getHeight() - diffHeight);            
        }

        if (diffWidth >= 0) {
            jPanel1.setBounds(jPanel1.getX(), jPanel1.getY(), jPanel1.getWidth() + diffWidth, jPanel1.getHeight());
        }
        else {
            jPanel1.setBounds(jPanel1.getX(), jPanel1.getY(), jPanel1.getWidth() - diffWidth, jPanel1.getHeight());
        }
       
        System.out.println("jPanel1.getHeight() 2 = " + jPanel1.getHeight());
        originalHeight = newHeight;
        originalWidth = newWidth;
    }    

My output is
jPanel1.getHeight() = 550
jPanel1.getHeight() 2 = 750 (CORRECT UP TO HERE)
when I did my 2nd resize....
jPanel1.getHeight() = 550 (it is back to original height)
jPanel1.getHeight() 2 = 642

Any idea?
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Question by:suprapto45
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17 Comments
 
LVL 16

Author Comment

by:suprapto45
ID: 18813912
Might be a silly thing but I could not figure out what did I miss ;)
0
 
LVL 37

Expert Comment

by:zzynx
ID: 18814126
>> I would like the few components to auto-locate to fit the size.
Isn't that what a layout manager (automatically) takes care of?
0
 
LVL 16

Author Comment

by:suprapto45
ID: 18814132
Yep,

However, I think it uses either Null layout or AbsoluteLayout (from NetBeans). I think that this layout would not be able to control those auto-resize.

Am I right?

Thanks
David
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LVL 16

Author Comment

by:suprapto45
ID: 18814189
I fixed the bugs.

        if (diffHeight >= 0) {
            jPanel1.setBounds(jPanel1.getX(), jPanel1.getY(), jPanel1.getWidth(), jPanel1.getHeight() + diffHeight);            
        }
        else {            
            jPanel1.setBounds(jPanel1.getX(), jPanel1.getY(), jPanel1.getWidth(), jPanel1.getHeight() - diffHeight);            
        }

If I resize the form and the diffHeight becomes -100 (for example), then

        else {            
            jPanel1.setBounds(jPanel1.getX(), jPanel1.getY(), jPanel1.getWidth(), jPanel1.getHeight() - diffHeight);            
        }

will be inaccurate. It becomes  jPanel1.getHeight() - (-100) and in the end, it is  jPanel1.getHeight() + 100.

I solved the problem using
        else {            
            jPanel1.setBounds(jPanel1.getX(), jPanel1.getY(), jPanel1.getWidth(), jPanel1.getHeight() - Math.abs(diffHeight));            
        }
0
 
LVL 16

Author Comment

by:suprapto45
ID: 18814190
Thanks zzynx for replying anyway.

That is my mistake.

David
0
 
LVL 37

Expert Comment

by:zzynx
ID: 18814201
>> Null layout or AbsoluteLayout.
>> I think that this layout would not be able to control those auto-resize
That's right

>> Thanks zzynx for replying anyway.
You're welcome

>> I solved the problem
>> That is my mistake.
So, no more questions left?

0
 
LVL 16

Author Comment

by:suprapto45
ID: 18814215
>>"So, no more questions left?"
Yes :). No more. I think that I am going to delete this question.

Any objection?

Thanks
David
0
 
LVL 37

Expert Comment

by:zzynx
ID: 18814292
OK for me.
0
 
LVL 16

Author Comment

by:suprapto45
ID: 18814688
Hi zzynx,

Instead of deleting the question, I have another question. Well, out of curiosity, I tried to use BorderLayout with expectation that it will automatically help me to do it.

However, I put my JScrollPane with JTable inside it on the BorderLayout.CENTER and the button on the BorderLayout.SOUTH. However, upon resizing my frame, my JScrollPane do not grow automatically, instead it keeps its current size.

What can I do to make the JScrollPane to resize itself once I resize my JFrame?

Thanks
David
0
 
LVL 16

Author Comment

by:suprapto45
ID: 18814695
And please bare with me as SWING (J2SE) is not my expertise ;)

David
0
 
LVL 37

Expert Comment

by:zzynx
ID: 18814702
>> my JScrollPane do not grow automatically
It simply should!

You probably apply setPreferredSize() or something like that on your scrollpane/JTable.
You shouldn't do that if you give the layouting in hands of a layout manager.
So remove all kind of setSize(), setPreferredSize(), .... calls.
0
 
LVL 16

Author Comment

by:suprapto45
ID: 18814728
Ok,

Give me a sec....
0
 
LVL 16

Author Comment

by:suprapto45
ID: 18814738
It still does not work. For example, when I tried to maximize the JFrame, the JScrollPane is not growing to fill up the empty space.

    private void initComponents() {
        jPanel1 = new javax.swing.JPanel();
        jScrollPane1 = new javax.swing.JScrollPane();
        tblAllBand = new javax.swing.JTable();
        ts.setTableHeader(tblAllBand.getTableHeader());
        jPanel2 = new javax.swing.JPanel();
        cmdBack = new javax.swing.JButton();
        btnEdit = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("View All Bands");
        jPanel1.setLayout(new java.awt.FlowLayout(java.awt.FlowLayout.LEFT));

        tblAllBand.setModel(ts);
        tblAllBand.setAutoResizeMode(javax.swing.JTable.AUTO_RESIZE_OFF);
        jScrollPane1.setViewportView(tblAllBand);

        jPanel1.add(jScrollPane1);

        getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER);

        jPanel2.setLayout(new java.awt.FlowLayout(java.awt.FlowLayout.RIGHT));

        cmdBack.setFont(new java.awt.Font("Arial", 0, 12));
        cmdBack.setText("Back");
        cmdBack.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                cmdBackActionPerformed(evt);
            }
        });

        jPanel2.add(cmdBack);

        btnEdit.setFont(new java.awt.Font("Arial", 0, 12));
        btnEdit.setText("Edit");
        btnEdit.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnEditActionPerformed(evt);
            }
        });

        jPanel2.add(btnEdit);

        getContentPane().add(jPanel2, java.awt.BorderLayout.SOUTH);

        pack();
}

I could not find any setPreferredSize() or setSize().

Let me keep looking....please let me know if you find anything suspicious.

Thanks.
David
0
 
LVL 37

Accepted Solution

by:
zzynx earned 400 total points
ID: 18815068
This is the reason:
>> jPanel1.setLayout(new java.awt.FlowLayout(java.awt.FlowLayout.LEFT));
>> ...
>> jPanel1.add(jScrollPane1);

Change this to:

jPanel1.setLayout(new java.awt.BorderLayout());
...
jPanel1.add(jScrollPane1, java.awt.BorderLayout.CENTER);
0
 
LVL 37

Expert Comment

by:zzynx
ID: 18815073
So, your jPanel1 didn't have the BorderLayout but the FlowLayout.
In that case the behaviour you experienced was normal.
0
 
LVL 16

Author Comment

by:suprapto45
ID: 18815788
You know what zzynx,

That works like a charm. You deserve more points. I should learn this SWING more ;).

Thanks again. Really appreciate it.
David
0
 
LVL 37

Expert Comment

by:zzynx
ID: 18821890
>> That works like a charm.
:°)

>> You deserve more points.
Well, thanks

>> I should learn this SWING more ;)
Yeah. Once you know it good, it's not that hard anymore.

>> Thanks again. Really appreciate it.
You're welcome. Glad to help.
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