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JScrollPane and JPanel

Posted on 2004-09-14
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Last Modified: 2010-03-31
Hi,

I got this problem...I try to put some small JPanel into a bigger JPanel, and put the bigger one into a JScrollPane in case if the bigger one cannot show all components inside...but now I cannot see all the components which are inside of the bigger JPanel...and no scroll bar displayed...Please help me to exam my codes...


JPanel basicPanel = new JPanel();
JPanel comPanel[] = new JPanel[6];
JScrollPane scPanel = new JScrollPane(basicPanel, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);

basicPanel.setLayout(null);
basicPanel.setSize(850, 400);
basicPanel.setBackground(Color.black);

for (int i = 0; i < 6; i++)
{
 JLabel tmpLabel = new JLabel("Panel " + String.valueOf(i));
 comPanel[i] = new JPanel();
 comPanel[i].add(tmpLabel);
 basicPanel.add(comPanel[i]);
 comPanel[i].setBounds(0, i*100, 300, 100);
}



so what should I do???



Xenia
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Question by:xenia27
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13 Comments
 
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Assisted Solution

by:expertmb
expertmb earned 100 total points
ID: 12061699
it will display scrollbar always
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS
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LVL 92

Expert Comment

by:objects
ID: 12061701
why aren't you using a layout manager?
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LVL 92

Expert Comment

by:objects
ID: 12061702
Make sure you are adding scPanel to your component hierarchy, and not basicPanel.
0
 

Author Comment

by:xenia27
ID: 12061733
OK...I try JScrollPane.VERTICAL_SCROLLBAR_ALWAYS and JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS
I do saw the scroll panel but I cannot scroll down as it should be...Any idea?

Just need to align all the smaller JPanel by myself...
0
 
LVL 6

Expert Comment

by:expertmb
ID: 12061735
import javax.swing.*;
import java.awt.*;
class scrlpaneTest extends JFrame{

      public static void main(String[] s){
            scrlpaneTest t = new scrlpaneTest();
            t.setSize(400,400);
            t.setVisible(true);
      }

      scrlpaneTest(){
            JPanel basicPanel = new JPanel();
            JPanel comPanel[] = new JPanel[6];
            JScrollPane scPanel = new JScrollPane(basicPanel,
            JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);

            basicPanel.setLayout(null);
            basicPanel.setSize(850, 400);
            basicPanel.setBackground(Color.black);

            getContentPane().add(scPanel, BorderLayout.CENTER);
            for (int i = 0; i < 6; i++)
            {
             JLabel tmpLabel = new JLabel("Panel " + String.valueOf(i));
             comPanel[i] = new JPanel();
             comPanel[i].add(tmpLabel);
             basicPanel.add(comPanel[i]);
             comPanel[i].setBounds(0, i*100, 300, 100);
            }
      }
}
0
 
LVL 92

Expert Comment

by:objects
ID: 12061747
> I do saw the scroll panel but I cannot scroll down as it should be...Any idea?

that is because your scroll pane thinks the panel is smaller than the viewport.

A layout manager make all this a lot easier, as it handles all the required sizing for you.
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Author Comment

by:xenia27
ID: 12061759
so should I set viewport???
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LVL 92

Expert Comment

by:objects
ID: 12061776
personally I'd use a layout manager
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Author Comment

by:xenia27
ID: 12061785
so which Layout manager is preferred???
0
 
LVL 92

Accepted Solution

by:
objects earned 400 total points
ID: 12061788
if not using a layout manager try setting the preferred size of your panel:

basicPanel.setPreferredSize(new Dimension(850, 400));
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Expert Comment

by:objects
ID: 12061813
a BoxLayout would seem suitable for you.
Did setting the preferred size help?
0
 
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Expert Comment

by:expertmb
ID: 12061839
problem with the basicPanel setSize or preffered size
try to give different value for X you will see the scroll bar effect
basicPanel.setPreferredSize(new Dimension(100, X));

moreover its null layout which is making the panels to appear till the size of the panel height and width,
after that panels will not be visible.
0
 

Author Comment

by:xenia27
ID: 12061875
OK...it works...I  mean setPreferredSize...^^...Thanks~
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