Java SWT - 设置 Canvas 背景颜色

Question

我正在为我的项目使用 SWT Canvas。我的问题是我无法为其设置背景颜色。这是我的代码。无论我为背景设置什么颜色，当我运行我的插件时，我只会得到浅灰色的默认背景颜色。有人可以帮我解决这个问题吗？

谢谢!

@Override
public void createPartControl(Composite parent) {

    scParent = new ScrolledComposite(parent, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
    scParent.setBackground(SWTResourceManager.getColor(SWT.COLOR_WHITE));
    scParent.setExpandHorizontal(true);
    scParent.setExpandVertical(true);

    // Create Canvas to hold the table
    tableCanvas = new Canvas(scParent, SWT.H_SCROLL | SWT.V_SCROLL);
        tableCanvas.setBackground(SWTResourceManager.getColor(SWT.COLOR_WHITE));
    GridData gd = new GridData(SWT.FILL, SWT.FILL, true, true);
    gd.heightHint = 116;
    gd.horizontalSpan = 3;
    tableCanvas.setLayoutData(gd);

Answer 1

以下是我为使滚动复合正常工作而采取的解决方法。早些时候，滚动机制也不起作用+我无法设置背景。这是更新后的代码:

@Override
public void createPartControl(Composite parent) {
    parent.setBackground(SWTResourceManager.getColor(SWT.COLOR_WHITE));
    parent.setLayout(new FillLayout(SWT.HORIZONTAL));

    ScrolledComposite scrolledComposite = new ScrolledComposite(parent, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
    scrolledComposite.setBackground(SWTResourceManager.getColor(SWT.COLOR_WHITE));
    scrolledComposite.setExpandHorizontal(true);
    scrolledComposite.setExpandVertical(true);
    scrolledComposite.setMinWidth(400);
    scrolledComposite.setMinHeight(400);

    Composite myViewParent = new Composite(scrolledComposite, SWT.NONE);
    myViewParent.setBackground(SWTResourceManager.getColor(SWT.COLOR_CYAN));
    myViewParent.setLayout(null);

    Button btnNewButton = new Button(myViewParent, SWT.NONE);
    btnNewButton.setBounds(45, 237, 90, 30);
    btnNewButton.setText("New Button");

    scrolledComposite.setContent(myViewParent);
    scrolledComposite.setMinSize(myViewParent.computeSize(SWT.DEFAULT, SWT.DEFAULT));
    parent.setSize(600, 300);