JScrollPane for JTable in a GridBagLayout

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4 total messages Started by Oliver Fri, 01 Apr 2005 14:26

#642

Author: Oliver
Date: Fri, 01 Apr 2005 14:26

24 lines
2047 bytes

Hello,

i am having some trouble in implementing a JScrollPane for a JTable (im showing database records there via SQL). 

The JScrollPane is placed on a JPanel which in turn resides on my main frame. My main Frame has a GridBagLayout.The JPanel has also a GridBagLayout.

I am using table.setSize(...) to make the JTable bigger than the screen. This works ok. Now im using 

table.setPreferredScrollableViewportSize(t);

where t is a region inside the screen (smaller than the JTable).
Now: how big do i have to make the JScrollPane? 

1) if i make the JScrollPane as big as the JTable, then there appears a horizontal ScrollBar (scroller.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
but it has no knob for scrolling (i assume because they have the same size, the system thinks its not necessary)

2) if i make the JScrollPane as big as t (inside the screen), the JTable becomes also smaller (which i do not want - i want the JTable to be bigger than the screen).

Does somebody have a hint how i can get a horizontal scrollbar which works for a JTable which is bigger than the screen?

thanks

Oliver

Re: JScrollPane for JTable in a GridBagLayout

#643

Author: Oliver
Date: Fri, 01 Apr 2005 15:57

15 lines
1309 bytes

Hello,

now i have tried the following approach:

table.setAutoResizeMode (JTable.AUTO_RESIZE_OFF);
scroller.setHorizontalScrollBar(new JScrollBar());
table.setAutoResizeMode (JTable.AUTO_RESIZE_OFF);

this is almost ok (at least i can scroll the table now) 
- but it looks somewhat odd (i can scroll the table horizontally, but i have to pull the scrollbar up and down to do this).

regards

Oliver

Re: JScrollPane for JTable in a GridBagLayout

#644

Author: John McGrath [TeamB]
Date: Sat, 02 Apr 2005 04:49

22 lines
1641 bytes

On 4/1/2005 at 9:26:20 AM, Oliver wrote:

> 1) if i make the JScrollPane as big as the JTable, then there appears a
> horizontal ScrollBar
> (scroller.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_A
> LWAYS); but it has no knob for scrolling (i assume because they have the
> same size, the system thinks its not necessary)
> 
> 2) if i make the JScrollPane as big as t (inside the screen), the JTable
> becomes also smaller (which i do not want - i want the JTable to be
> bigger than the screen).

Can you post a runnable example of the problem?

-- 
Regards,

John McGrath [TeamB]

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Re: JScrollPane for JTable in a GridBagLayout

#646

Author: Oliver
Date: Fri, 08 Apr 2005 10:10

57 lines
3080 bytes

Hello

its a bit difficult for me to extract the relevant parts from 
my code, but i am using

protected ColorTable  table    = new ColorTable(); 
protected JScrollPane scroller = new JScrollPane(table);

private void createGUI() {
        GridBagLayout layout = new GridBagLayout();
        controlPanel.setLayout(layout);
        controlPanel.setBorder(BorderFactory.createCompoundBorder(
                               BorderFactory.createEtchedBorder(),
                               BorderFactory.createEmptyBorder(10, 10, 10, 10)));
        // controlPanel.setForeground();
        setLayout(layout);

        GridBagConstraints constraints = new GridBagConstraints();
        constraints.fill = GridBagConstraints.HORIZONTAL;
        constraints.anchor = GridBagConstraints.NORTH;
        constraints.weightx = 1;
        constraints.weighty = 0;
        constraints.gridx = 0;
        constraints.gridy = 0;
        constraints.gridwidth = 1;
        constraints.gridheight = 1;
        add(toolBar, constraints);
        toolBar.addSeparator(new Dimension(10, -1));
        toolBar.setFloatable(false);
        toolBar.setBackground(new Color(133,100,183));

        constraints.gridy = 1;
        add(controlPanel, constraints);
        constraints.fill = GridBagConstraints.BOTH;
        constraints.anchor = GridBagConstraints.CENTER;
        constraints.weightx = 1;
        constraints.weighty = 1;
        constraints.gridy = 2;
        scroller.setBorder(BorderFactory.createLoweredBevelBorder());
        add(scroller, constraints);
        setPreferredSize(new Dimension(800, 800));
    }

private void SetScrollbar() {
        table.setAutoResizeMode (JTable.AUTO_RESIZE_OFF);
        scroller.setHorizontalScrollBar(new JScrollBar());
        table.setAutoResizeMode (JTable.AUTO_RESIZE_OFF);
    }

where ColorTable is a descendant of JTable (with a special Renderer), and scroller is a JScrollPane.

Im not so familiar with the GridBagLayout, maybe this plays a role here too?

kind regards

Oliver

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