无法在滚动组合中显示TableViewer

Question

我试着在他们中间展示两张桌子的观众和按钮。当试图实现TableViewer以显示水平和垂直滚动条时，我无法看到TableViewer，只能看到ScrolledComposite。我甚至尝试在ScrolledComposite中创建一个复合，并使用该组合来显示TableViewer，但仍然看不到TableViewer。有人能给我指明正确的方向吗。

@Override
protected Control createDialogArea(Composite parent) {
    GridData gridData = new GridData(SWT.NONE, SWT.FILL, true, true);
    gridData.heightHint = 500;
    gridData.widthHint = 700;
    Composite parentComposite = new Composite(parent, SWT.NONE);
    parentComposite.setLayout(new GridLayout(3, true));
    parentComposite.setLayoutData(gridData);
    ScrolledComposite scrolledComposite_1 = new ScrolledComposite(parentComposite, SWT.H_SCROLL|SWT.V_SCROLL);
    scrolledComposite_1.setLayout(new GridLayout(1,false));
    gridData = new GridData(SWT.NONE, SWT.FILL, true, true);
    gridData.heightHint = 200;
    gridData.widthHint = 400;
    scrolledComposite_1.setLayoutData(gridData);
    scrolledComposite_1.setAlwaysShowScrollBars(true);
    TableViewer tableViewer1 = new TableViewer(scrolledComposite_1, SWT.BORDER | SWT.SINGLE);
    tableViewer1.getTable().setHeaderVisible(true);
    tableViewer1.getTable().setLayout(new GridLayout(1,false));
    tableViewer1.getTable().setLayoutData(new GridData(200,400));
    createButtonComposite(parentComposite,SWT.NONE);
    ScrolledComposite scrolledComposite_2 = new ScrolledComposite(parentComposite, SWT.H_SCROLL|SWT.V_SCROLL);
    scrolledComposite_2.setLayout(new GridLayout(1,false));
    gridData = new GridData(SWT.NONE, SWT.FILL, true, true);
    gridData.heightHint = 200;
    gridData.widthHint = 400;
    scrolledComposite_2.setLayoutData(gridData);
    scrolledComposite_2.setAlwaysShowScrollBars(true);
    TableViewer tableViewer2= new TableViewer(scrolledComposite_2, SWT.BORDER | SWT.SINGLE);
    tableViewer2.getTable().setHeaderVisible(true);
    tableViewer2.getTable().setLayoutData(new GridData(200,400));
    getShell().setText("My Dialog"); 
    return parent;
}

Answer 1

ScrolledComposite要求您调用setContents来告诉它子控件，还需要其他各种设置。这样做是可行的：

scrolledComposite_1.setContent(tableViewer1.getTable());
scrolledComposite_1.setExpandVertical(true);
scrolledComposite_1.setExpandHorizontal(true);
scrolledComposite_1.setMinSize(tableViewer1.getTable().computeSize(SWT.DEFAULT, SWT.DEFAULT));

(第2号相同)

但是，TableViewer可以自己显示滚动条，因此根本不需要ScrolledComposite：

Composite parentComposite = new Composite(parent, SWT.NONE);
parentComposite.setLayout(new GridLayout(3, true));
parentComposite.setLayoutData(gridData);

TableViewer tableViewer1 = new TableViewer(parentComposite, SWT.BORDER | SWT.SINGLE | SWT.V_SCROLL | SWT.H_SCROLL);
tableViewer1.getTable().setHeaderVisible(true);
tableViewer1.getTable().setLayout(new GridLayout(1,false));
tableViewer1.getTable().setLayoutData(new GridData(200,400));

createButtonComposite(parentComposite,SWT.NONE);

TableViewer tableViewer2= new TableViewer(parentComposite, SWT.BORDER | SWT.SINGLE | SWT.V_SCROLL | SWT.H_SCROLL);
tableViewer2.getTable().setHeaderVisible(true);
tableViewer2.getTable().setLayoutData(new GridData(200,400));