JTable - getting component width

Question

Hello
I've come across a small problem I can't overcome as I'm new with Swing.
I would like to set the initial sizes of JTable column headers using a values from array that indicate the percentage size of JTable container for every header e.i.:
int[] columnsWidth = new int[]{20,70,5,5};   //4 columns //20%,70%,5%,5% of   JTable width
//in MyTable constructor
                TableColumn column = null;
          for(int i =0; i<dm.getColumnCount();i++){
               column = getColumnModel().getColumn(i);
                  double width = (columnsWidth/100.0)* getWidth();
               column.setPreferredWidth((int)width);
unfortunately JComponent:getWidth() returns 0, probably because its in JTable constructor, but where can i get correct component width ?
Thanks for your help!

Answer 1

I have some code that does something close; but I don't think it's completely what you want.
First, in our table model, we define some widths:
private final static int[] widths = { 10, 20, 20, 10};Then, in our table class, we for each of these columns. We essentially take the width of 10, multiple by some value, and use that value. I was tryign to be able to specify widths in characters, assuming a fixed width font.
    private void setPreferredColumnWidths() {
        for (int i = 0; i < getColumnCount(); i++) {
            TableColumn col = getColumnModel().getColumn(i);
            int w = getColumnWidth(i);
            col.setPreferredWidth(w);
            col.setWidth(w);
    }We disable the resize on the table columns, as we want fixed width columns within a scrollable pane. However, if you enable auto sizing:
setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);You'll find that the EXTRA space is alloted relative on the preferred size of those columns. It doesn't result in the exact % width you are looking for, so I don't know if that's close enough for you.