Question

我需要SWT帮助。我想在一个组中创建一个滚动列表。我使用以下代码，但组的大小是可变的，并且Scrollbars不可用。我想要一个具有给定大小的List，如果列表中有太多条目，我想让一个滚动条向下滚动。

    super(parent, style);

    this.setLayout(new GridLayout(1,false));
    Group grpSettings = new Group(this, SWT.NONE);
    grpSettings.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
    grpSettings.setText("Settings");
    grpSettings.setLayout(new GridLayout(1, false));
    grpSettings.setSize(200, 200);

    Label nameLabel = new Label(grpSettings, SWT.NONE);
    nameLabel.setText("Choose");

    ScrolledComposite scroll = new ScrolledComposite(grpSettings, SWT.V_SCROLL | SWT.H_SCROLL);
    scroll.setSize(200, 200);
    scroll.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
    scroll.setAlwaysShowScrollBars(true);

    final List list = new List(scroll, SWT.NONE); // Create a List with a vertical ScrollBar
     // Add a bunch of items to it

    for (int i=1;i < 50 ;i++ ){
        list.add("Ex" + i);
    }

    scroll.setContent(list);
    scroll.setExpandHorizontal(true);
    scroll.setExpandVertical(true);


     list.addListener(SWT.Selection, new Listener () {
            public void handleEvent (Event e) {
                int es = list.getSelectionIndex();
                System.out.println(es);
            }
     });
}

Answer 1

List窗口小部件有自己的滚动条，因此无需将其包装到ScrolledComposite中。

与下面的代码段相似，只需使用List样式标记

创建V_SCROLL即可

public static void main( String[] args ) {
  Display display = new Display();
  Shell shell = new Shell( display );
  shell.setLayout( new FillLayout() );
  Group group = new Group( shell, SWT.NONE );
  group.setText( "Group" );
  group.setLayout( new GridLayout( 1, false ) );
  Label label = new Label( group, SWT.NONE );
  label.setText( "Choose" );
  List list = new List( group, SWT.V_SCROLL );
  list.setLayoutData( new GridData( SWT.FILL, SWT.FILL, true, true ) );
  for( int i = 0; i < 128; i++ ) {
    list.add( "Item " + i );
  }
  shell.setSize( 300, 300 );
  shell.open();
  while( !shell.isDisposed() ) {
    if( !display.readAndDispatch() )
      display.sleep();
  }
  display.dispose();
}

组内的SWT列表无法滚动

1 个答案: