[jdjlist] Re: 2 JTable questions

David Treves Sun, 09 Jun 2002 22:38:08 -0700

Hi guys,

I have solved both questions I posted 2 days ago, here are my solutions:

1) vertical table headers: I created a sub class of JTableHeader which sets a new UI to the DefaultTableCellRenderer. Note that the DefaultTableCellRenderer is actually a sub class of JLabel. The new UI takes the current text, generates an image of the text in a vertical sequence and sets it in the JLabel.

Here is the code for that:

//the vertical JTableHeader class

public class VerticalTableHeader extends JTableHeader {
    public VerticalTableHeader() {
        super();
        JLabel label = (DefaultTableCellRenderer)getDefaultRenderer();
        label.setUI(new VerticalLabelUI(false));
    }

    public VerticalTableHeader(TableColumnModel cm) {
        this();
        setColumnModel(cm);
    }
}

//the vertical UI

public class VerticalLabelUI extends BasicLabelUI {
    static {
        labelUI = new VerticalLabelUI(false);
    }

protected boolean clockwise;

    /**
     * VerticalLabelUI constructor
     * @param clockwise direction of the text.
     */
    public VerticalLabelUI( boolean clockwise ) {
        super();
        this.clockwise = clockwise;
    }

    public Dimension getPreferredSize(JComponent c) {
        Dimension dim = super.getPreferredSize(c);
        return new Dimension( dim.height, dim.width );
    }

    private static Rectangle paintIconR = new Rectangle();
    private static Rectangle paintTextR = new Rectangle();
    private static Rectangle paintViewR = new Rectangle();
    private static Insets paintViewInsets = new Insets(0, 0, 0, 0);

    public void paint(Graphics g, JComponent c) {
        JLabel label = (JLabel)c;
        String text = label.getText();
        Icon icon = (label.isEnabled()) ? label.getIcon() : label.getDisabledIcon();

        if ((icon == null) && (text == null)) {
            return;
        }

FontMetrics fm = g.getFontMetrics();
paintViewInsets = c.getInsets(paintViewInsets);

paintViewR.x = paintViewInsets.left;
paintViewR.y = paintViewInsets.top;

        // Use inverted height & width
        paintViewR.height = c.getWidth() - (paintViewInsets.left + paintViewInsets.right);
        paintViewR.width = c.getHeight() - (paintViewInsets.top + paintViewInsets.bottom);

paintIconR.x = paintIconR.y = paintIconR.width = paintIconR.height = 0;
paintTextR.x = paintTextR.y = paintTextR.width = paintTextR.height = 0;

String clippedText =
layoutCL(label, fm, text, icon, paintViewR, paintIconR, paintTextR);

        Graphics2D g2 = (Graphics2D) g;
        AffineTransform tr = g2.getTransform();
        if ( clockwise ) {
            g2.rotate( Math.PI / 2 );
            g2.translate( 0, - c.getWidth() );
        } else {
            g2.rotate( - Math.PI / 2 );
            g2.translate( - c.getHeight(), 0 );
        }

        if (icon != null) {
            icon.paintIcon(c, g, paintIconR.x, paintIconR.y);
        }

        if (text != null) {
            int textX = paintTextR.x;
            int textY = paintTextR.y + fm.getAscent();

            if (label.isEnabled()) {
                paintEnabledText(label, g, clippedText, textX, textY);
            } else {
                paintDisabledText(label, g, clippedText, textX, textY);
            }
        }

g2.setTransform( tr );
}
}

---------------------------------------------------------------------------

2) The squashed table headers: this problem is caused since my first header (the left one) was an empty String, once I changed the header's value to " " (a white space), the problem was solved.

I recommend to copy and save this code, it will help you save a few hours of investigating almost all classes in the swing.table package... :o)

I want to thank anyone who tried to help!

David Treves.

----- Original Message -----

From: Madhav Vodnala

To: JDJList

Sent: Monday, June 10, 2002 7:09 AM

Subject: [jdjlist] Re: 2 JTable questions

Check out my comments below.

----- Original Message -----

From: David Treves

To: JDJList

Sent: Sunday, June 09, 2002 3:18 PM

Subject: [jdjlist] 2 JTable questions

Hi all,

1) I wish to set vertical headers in a JTable, is that possible? if so, how is it done?

[Madhav]

As such, there is no direct support for vertical headers.

2) For some reason my current headers look like they were squashed... Their height is very short, I don't know why that happens, I simply create a table, generate the headers and add the table to a scroll pane, I can't seem to overcome that problem. Did anyone see something like that? I am sure I am missing something in here...

[Madhav]

Which look&feel are you using? and also the OS.

Try table.column.setHeaderRenderer(TableCellRenderer) to increase the header height.

Thanks,

David.
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[jdjlist] Re: 2 JTable questions

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