Java SWT 使标签可滚动

Question

我在 SWT 的 Group 中有一个 Label，如果它包含多行文本，我想让它垂直滚动。使用 SWT.V_SCROLL 设置样式参数似乎并没有做到这一点。我该怎么做？

Answer 1

Label不支持滚动。

您可以使用只读 Text 控件来滚动：

Text text = new Text(parent, SWT.READ_ONLY | SWT.V_SCROLL);

Answer 2

这里有一个方法

ScrolledComposite ivScrollComposite = new ScrolledComposite( ivShell, SWT.V_SCROLL );
ivScrollComposite.addControlListener( new ScrollCompositeControlListener() );
ivScrollComposite.setExpandVertical( true );
ivScrollComposite.setExpandHorizontal( true );
ivScrollComposite.setAlwaysShowScrollBars( true );

Composite ivCompositeResults = new Composite( ivScrollComposite, SWT.NONE );
Label ivLabelResults = new Label( ivCompositeResults, SWT.WRAP );

ivScrollComposite.setContent( ivCompositeResults );

ivScrollComposite.setLayout( new FormLayout() );

FormData formData = new FormData();
formData.top = new FormAttachment( 0, 0 );
formData.left = new FormAttachment( 0, 0 );
formData.right = new FormAttachment( 100, 0 );
formData.bottom = new FormAttachment( 100, 0 );
ivCompositeResults.setLayoutData( formData );

ivCompositeResults.setLayout( new FormLayout() );

formData = new FormData();
formData.top = new FormAttachment( 0, 0 );
formData.left = new FormAttachment( 0, 0 );
formData.right = new FormAttachment( 100, 0 );
formData.bottom = new FormAttachment( 100, 0 );
ivLabelResults.setLayoutData( formData );

然后

private void resizeScroll()
{
    Rectangle r = ivScrollComposite.getClientArea();
    ivScrollComposite.setMinSize( ivCompositeResults.computeSize( r.width, SWT.DEFAULT ) );
}

private class ScrollCompositeControlListener extends ControlAdapter
{
    @Override
    public void controlResized( ControlEvent e )
    {
        resizeScroll(); 
    }
}

每当您更改标签文本时

ivLabelResults.setText( "some text" );
resizeScroll();

Java SWT 使标签可滚动

Java SWT make a Label Scrollable

java

swt

label