asked on

JFrame resize problem

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?

suprapto45

ASKER

Might be a silly thing but I could not figure out what did I miss ;)

zzynx

>> I would like the few components to auto-locate to fit the size.
Isn't that what a layout manager (automatically) takes care of?

suprapto45

ASKER

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

suprapto45

ASKER

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));
}

suprapto45

ASKER

Thanks zzynx for replying anyway.

That is my mistake.

David

zzynx

>> 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?

suprapto45

ASKER

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

Any objection?

Thanks
David

zzynx

OK for me.

suprapto45

ASKER

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

suprapto45

ASKER

And please bare with me as SWING (J2SE) is not my expertise ;)

David

zzynx

>> 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.

suprapto45

ASKER

Ok,

Give me a sec....

suprapto45

ASKER

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

ASKER CERTIFIED SOLUTION

zzynx

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zzynx

So, your jPanel1 didn't have the BorderLayout but the FlowLayout.
In that case the behaviour you experienced was normal.

suprapto45

ASKER

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

zzynx

>> 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.