Java SWT - 组内的 ScrolledComposite

问题描述：

我在将 ScrolledComposite 放入 Group 时遇到问题 - 它没有显示在 Group 内.ScrolledComposite 必须滚动 Label.

I have a problem with putting ScrolledComposite inside the Group - it doesn't show inside the Group. ScrolledComposite has to scroll the Label.

final private static Group group_netpbmOutput = new Group(shell, SWT.NONE);
final private static ScrolledComposite scroll_netpbmOutput = new ScrolledComposite(group_netpbmOutput, SWT.V_SCROLL | SWT.H_SCROLL);
final private static Label labelImage_netpbmOutput = new Label(scroll_netpbmOutput, SWT.BORDER);

//init Group
group_netpbmOutput.setLayout(new FillLayout());
formData = new FormData(((FormData)group_options.getLayoutData()).width, 200);
formData.top = new FormAttachment(group_options, 50, SWT.BOTTOM);
formData.left = new FormAttachment(group_options, 0, SWT.LEFT);
group_netpbmOutput.setLayoutData(formData);
group_netpbmOutput.setFont(font_group);
group_netpbmOutput.setText("Netpbm output");

//init Label
labelImage_netpbmOutput.setBackgroundImage(new Image(...));

//init ScrollComposite
scroll_netpbmOutput.setLayout(new FillLayout());
scroll_netpbmOutput.setContent(labelImage_netpbmOutput);

对巴兹回答的反应

那行得通，但是……图片是这样显示的(应该只有一个*"):

That works, but...the picture is showed this way (there should be only one '*'):

final private static Group group_netpbmOutput = new Group(shell, SWT.NONE);
final private static ScrolledComposite scroll_netpbmOutput = new ScrolledComposite(group_netpbmOutput, SWT.V_SCROLL | SWT.H_SCROLL);
final private static Label labelImage_netpbmOutput = new Label(scroll_netpbmOutput, SWT.BORDER);

group_netpbmOutput.setLayout(new GridLayout());
formData = new FormData(((FormData)group_options.getLayoutData()).width, 200);
formData.top = new FormAttachment(group_options, 50, SWT.BOTTOM);
formData.left = new FormAttachment(group_options, 0, SWT.LEFT);
group_netpbmOutput.setLayoutData(formData);
group_netpbmOutput.setFont(font_group);
group_netpbmOutput.setText("Netpbm output");

labelImage_netpbmOutput.setBackgroundImage(new Image(...));

scroll_netpbmOutput.setLayout(new GridLayout(1, false));
scroll_netpbmOutput.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

scroll_netpbmOutput.setContent(labelImage_netpbmOutput);
scroll_netpbmOutput.setExpandHorizontal(true);
scroll_netpbmOutput.setExpandVertical(true);
scroll_netpbmOutput.setMinSize(labelImage_netpbmOutput.computeSize(SWT.DEFAULT, SWT.DEFAULT));

答

不太确定为什么您的代码不起作用.这可能是因为您没有通过 ScrolledComposite#setMinSize(Point) 设置 ScrolledComposite 的最小尺寸.

Not quite sure why your code isn't working. It's maybe because you're not setting the min-size of the ScrolledComposite via ScrolledComposite#setMinSize(Point).

不过这确实很好用:

public static void main(String[] args)
{
    Display display = new Display();
    Shell shell = new Shell();
    shell.setText("*");
    shell.setLayout(new GridLayout(1, false));

    Group group = new Group(shell, SWT.NONE);
    group.setText("Group");
    group.setLayout(new GridLayout(1, false));
    group.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

    ScrolledComposite scroll = new ScrolledComposite(group, SWT.V_SCROLL | SWT.H_SCROLL);
    scroll.setLayout(new GridLayout(1, false));
    scroll.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

    Image image = new Image(display, "*.png");

    Label label = new Label(scroll, SWT.NONE);
    label.setImage(image);

    scroll.setContent(label);
    scroll.setExpandHorizontal(true);
    scroll.setExpandVertical(true);
    scroll.setMinSize(label.computeSize(SWT.DEFAULT, SWT.DEFAULT));

    shell.pack();
    shell.setSize(200, 200);
    shell.open();

    while (!shell.isDisposed())
    {
        if (!display.readAndDispatch())
        {
            display.sleep();
        }
    }
    display.dispose();

    image.dispose();
}

看起来像这样:

Java SWT - 组内的 ScrolledComposite

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