Java SWT：如何将表中列的内容居中？

Question

I need to center the content of the cells of the fourth column of my table, now they start on left.

This is the table:

    Table membersTable = new Table(clubComposite, SWT.BORDER | SWT.CHECK | SWT.FULL_SELECTION);
    membersTable.setLinesVisible(true);
    membersTable.setHeaderVisible(true);
    membersTable.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 1, 1));

    TableColumn tblclmnName = new TableColumn(membersTable, SWT.NONE);
    tblclmnName.setWidth(150);
    tblclmnName.setText("Nombre");

    TableColumn tblclmnCommonPhoneNumber = new TableColumn(membersTable, SWT.NONE);
    tblclmnCommonPhoneNumber.setWidth(120);
    tblclmnCommonPhoneNumber.setText("Teléfono");

    TableColumn tblclmnCommonMoney = new TableColumn(membersTable, SWT.NONE);
    tblclmnCommonMoney.setWidth(150);
    tblclmnCommonMoney.setText("Participación Habitual");

    TableColumn tblclmnPayed = new TableColumn(membersTable, SWT.CENTER);
    tblclmnPayed.setWidth(50);
    tblclmnPayed.setText("Pagado"); 

    // populate Table
    for (int i=0; i<50; i++) {
        TableItem tableItem = new TableItem(membersTable, SWT.CENTER);                  
        tableItem.setText(new String[] {"person "+i, "610610620", "100", ""});
        tableItem.setImage(3, uncheckedImage);
    }

I tried doing this:

TableColumn tblclmnPayed = new TableColumn(membersTable, SWT.CENTER);

But it seems that it only centers the title of the column, not it's content.

It is possible to achieve my needs on Java SWT?

Answer 1

In order to center the content of a column, you need to specify the SWT.CENTER style bit for the TableItem as well.

For example:

final Table table = new Table(shell, SWT.BORDER | SWT.V_SCROLL | SWT.FULL_SELECTION);
table.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
table.setHeaderVisible(true);
table.setLinesVisible(true);

final TableColumn column1 = new TableColumn(table, SWT.NONE);
column1.setText("Column 1");
column1.setWidth(75);

final TableColumn column2 = new TableColumn(table, SWT.NONE);
column2.setText("Column 2");
column2.setWidth(75);

final TableColumn column3 = new TableColumn(table, SWT.CENTER);
column3.setText("Column 3");
column3.setWidth(75);

for (int i = 0; i < 5; i++) {
    new TableItem(table, SWT.CENTER).setText(new String[] { "a", "b", "c" });
}

Note that this will only affect the contents for the column which also specifies SWT.CENTER , not the content for the other columns.

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Edit in regards to centering an image:

I don't believe it is possible to center an image within the table row via the style bits, since they seem to be ignored.

One alternative would be to use a paint listener to draw the image with the correct padding to center the image in the column (See: How to align image to center of table cell (SWT Table) ). Note that with this method the row is not resized based on the size of the image, so unless your image is tiny/the same height as the row, you'll have to do some additional work to keep the image form being cut off.