让JFace Dialog底部的按扭居中

查Eclipse源码可以看到：

java 代码

// in Dialog.class

protected Control createButtonBar(Composite parent) {
    ...

    GridData data = new GridData(GridData.HORIZONTAL_ALIGN_END
                | GridData.VERTICAL_ALIGN_CENTER);
    composite.setLayoutData(data);
    composite.setFont(parent.getFont());

    / Add the buttons to the button bar.
    createButtonsForButtonBar(composite);
}

于是，我应在在自己的Dialog类中， 这样:

java 代码

@Override
protected void createButtonsForButtonBar(Composite parent) {
    GridData gridData = (GridData) parent.getLayoutData();
    gridData.horizontalAlignment = SWT.CENTER;

    ...
}