JTable Transparency

I've got a Jtable that I'd like to make transparent. With my current code, the table appears 'greyed-out' vice transparent with the gradient background appearing through. I've tried to make everything opaque(false), and read up on concepts, but there must be some missing syntax here..I'd appreciate some constructive assistance..

Code:

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            final JTable table = new JTable(model){
                           
//Override JTable Render component for alternate row shading 
                   
                public Component prepareRenderer(TableCellRenderer renderer,
                                int rowIndex, int vColIndex) {
                        setOpaque(false);
                        Component c = super.prepareRenderer(renderer, rowIndex,
                                vColIndex);
                                if (isCellSelected(rowIndex, vColIndex)) {
                                        if (rowIndex % 2 == 0) {
                                                c.setBackground(Color.LIGHT_GRAY );
                                        } else {
                                                c.setBackground(getSelectionBackground());
                                        }
                                } else {
                                if (rowIndex % 2 == 0) {
                                        //c.setBackground(new Color(198, 217, 227));
                                        c.setBackground(new Color(224, 242, 252));
                                        } else {
                                                c.setBackground(getBackground());

                                                }
                                        };
                                       
                                       
                                return c;
                                }
               
                private float tran= 0.4f;

                @Override
                protected void paintComponent(Graphics g) {
                        Graphics2D g2 = (Graphics2D) g;
                        g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                        RenderingHints.VALUE_INTERPOLATION_BILINEAR);
                        AlphaComposite old = (AlphaComposite) g2.getComposite();
                        g2.setComposite(AlphaComposite.SrcOver.derive(getTran()));
                        super.paintComponent(g);
                        g2.setComposite(old);
                }
                public float getTran() {
                        return tran;
                }
               
                public void setTran(float tran) {
                        this.tran = tran;
                }
               
               
               
};
               
                table.setOpaque(false);
                table.convertRowIndexToView(row);
                table.setModel(model);
                table.setRowSorter(sorter); 
                //table.setAutoCreateRowSorter(true);
            //table.setDefaultRenderer(String.class, new CustomRenderer());
            table.setRowSelectionAllowed(true);     
            table.setColumnSelectionAllowed(true);   
            table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
            ListSelectionModel listMod =  table.getSelectionModel();
            listMod.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
            listMod.addListSelectionListener(this);

            return table; 
           
            }

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implementing the table inside a jpanel in my separate gui class:

Code:

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        JPanel invS = new JPanel(new BorderLayout());
       
        tbInv.add(sP, "North");
        tbInv.add(invS, "South");
        tbInv.setOpaque(false);
        invS.add(st.textField, "North");
        JScrollPane tableContainer = new JScrollPane(st.table);
        st.table.setPreferredScrollableViewportSize(new Dimension(990, 380));
        invS.add(tableContainer);
        tableContainer.setOpaque(false);
        invS.setOpaque(false);
        st.table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        st.table.setOpaque(false);

---

Get rid of everything that isn't related to the transparency issue and post an SSCCE and I'll take a look.

What were you trying to accomplish with a call to table.convertRowIndexToView(row) that discards the returned value?

db

Solved by setting the table container background to an alpha composite defined by float 'alpha' and adjusting my override of default table render. I didn't feel it was respectful to post and just not reply, but I've also seen warnings against 'spoon-feeding' and fear that if I post the code it will fall in that category. I want to be a contributor to this forums resources while respecting the rules, so let me know if I'm off base here.

I don't consider it spoonfeeding if I point out, with code, the one thing still to be done by someine who has evidently already invested considerable time and effort and needs just that one little thing to completely solve an issue. Anyone who posts a decent SSCCE fits the bill.

Quote:

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I want to be a contributor to this forums resources

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Welcome aboard! We could certainly do with some professional advice in the 2D and GUIs sections (I'm just an amateur hobby programmer).

db

THERE IS AN EASY AND HARD WAY.
EASY:
1.import java.awt.GraphicsDevice.WindowTranslucency;
2.setOpacity ( float value from 0.0f to 1.0f );
Done.
Ensure JDK 7 is installed...or no compilation.
This uniform translucency will render everything on screen with that alpha level. No need to change the opacity of the table itself.



OR
HARDISH:
You will need to extend the java scroll table on which your table is placed.eg

Code:

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import javax.swing.JViewPort;
import java.awt.GraidentPaint;
JScrollPane pane = new pane ( table )
{
@Override
protectect JViewPort createViewport ( )
{
return new JViewPort ( )
{
@OVerride
public void paintComponent ( Graphics2D g2d )
{
paint = new GradientPaint ( params - look them up lol );
g2d.setPaint ( paint );
g2d.fillRect ( 0, 0, table width, table height );
}
};
}
};
//setup colour with alpha
Color colour = new Color ( 0, 0, 0, 0 );
//adjust table and scroll pane viewport opacities
your table.setOpaque ( false);
your table.setBackground ( colour );
your scroll pane.getViewport ( ).setOpaque ( false);
your scroll pane.getViewport ( ).setBackground ( colour );

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DONE.