Re: gridLayout doesn't wo
To: comp.lang.java.gui
heixian@gmail.com wrote:
I am new to java.swing and its layout programming. I encounter a
strange problem when I use the boxLayout in a
base panel and gridLayout in each sub panel.
as you can see, I set the boxLayout in the base panel in vertical
fashion ( setJcontentPane() ). inside each box I use the gridLaout to
addbuttons. There are two boxes in the panel. The first one is for
user, the second one is for company. When you call the initialize()
the UI is built.
Inside the user box ( setManageUserPanel() ), the gridLayout is set to
(1, 3, 10 ,20)
One row with three columns
1 2 3
Inside the company box ( setManageCompanyPanel() ), the gridLayout is
set to (2, 3, 10, 20)
two rows with three columns
1 2 3
4 5 6
The problem is in the company box, the buttons are diplay in two rows
and each row has two buttons.
1--2,
3--4,
This indeed seems to be the way GridLayout behaves.
Should it be in two rows but first row has three buttons and second
row has only one?
1--2--3,
4
You need to add a couple of blank components to the panel.
e.g. after adding the fourth button, do something like
manageCompanyPanel.add(Box.createRigidArea(new Dimension(1,1)));
manageCompanyPanel.add(Box.createRigidArea(new Dimension(1,1)));
Also here are what I change the gridLayout for the company box, below
are how the button get display
(4, 1, 10, 20) correct
1--,
2--,
3--,
4--,
(1, 4, 10, 20) correct
1--2--3--4
(2, 4, 10, 20) NOT RIGHT!!!
1--2,
3--4,
You've allocated room for eight components but only added four. If you
don't like the way GridLayout allocates components to grid positions you
might want to use a different layout manager. Maybe FlowLayout is what
you want.
don't what's wrong of my code,
Some more comments below.
the gridLayout doesn't do what it
suppose to do. Please help
Your code wasn't complete and compilable, to try it out I had to fix
some errors and add a class and a main() and some fields.
Please read http://sscce.org to see how you can do more to help people
to help you.
private void initialize() {
this.setSize(1024, 768);
You don't need to prefix every method call with "this." I deleted them
all and it worked just the same.
this.setJContentPane();
JScrollPane scrollPane = new JScrollPane
( ScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
ScollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scrollPane.setViewportView(this.jContentPane);
this.setContentPane(scrollPane);
this.setTitle("Administration");
}
private void setJContentPane() {
this.jContentPane = new JPanel();
this.jContentPane.setPreferredSize(new Dimension(1024, 900));
The following seems to be wrong.
Box adminPanelBoxes[] = new Box[2];
for(int i=0; i<adminPanelBoxes.length; i++)
adminPanelBoxes[i] = Box.createVerticalBox();
this.setManageUserPanel();
adminPanelBoxes[0].add(this.manageUserPanel);
this.jContentPane.add(adminPanelBoxes[0]);
this.setManageCompanyPanel();
adminPanelBoxes[1].add(this.manageCompanyPanel);
this.jContentPane.add(adminPanelBoxes[1]);
I think you should have one Box and put two (or more) panels into it.
For convenience I've used an equivalent BoxLayout constructor.
jContentPane.setLayout(
new BoxLayout(jContentPane, BoxLayout.PAGE_AXIS));
setManageUserPanel();
jContentPane.add(this.manageUserPanel);
setManageCompanyPanel();
jContentPane.add(manageCompanyPanel);
}
private void setManageUserPanel() {
this.manageUserPanel = new JPanel();
this.manageUserPanel.setLayout( new GridLayout(1, 3, 10, 20) );
this.manageUserPanel.setPreferredSize(new Dimension(960, 100));
this.manageUserPanel.add( new JButton("button") );
this.manageUserPanel.add( new JButton("button");
Compare this line with the above. It is missing a closing )
Use cut & paste - don't re-type.
this.manageUserPanel.add( new JButton("button");
Ditto.
this.manageUserPanel.setBorder(
BorderFactory.createCompoundBorder(
BorderFactory.createTitledBorder("Border 1"),
BorderFactory.createEmptyBorder(5, 5, 5, 5)));
}
private void setManageCompanyPanel() {
this.manageFilterPanel = new JPanel();
I note the method name has "Company" but the panel name has "Filter".
This cannot be right.
this.manageFilterPanel.setLayout( new GridLayout(2, 3, 10, 20) );
this.manageFilterPanel.setPreferredSize(new Dimension(960, 200));
this.manageFilterPanel.add( new JButton("button") );
this.manageFilterPanel.add( new JButton("button") );
this.manageFilterPanel.add( new JButton("button") );
this.manageFilterPanel.add( new JButton("button") );
this.manageFilterPanel.setBorder(
BorderFactory.createCompoundBorder(
BorderFactory.createTitledBorder("Border 2"),
BorderFactory.createEmptyBorder(5, 5, 5, 5)));
}
Hope that helps.
Don't forget http://sscce.org
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