How to implement Auto-Hide Scrollbar in SWT Text Component

问题

I have a SWT Text component, for which I set SWT.MULTI, SWT.V_SCROLL and SWT.H_SCROLL to show the scrollbar when required. I found that even content is smaller than the text component then also scrollbar are visible in disable state.

Is there is any way through which I can auto hide the scrollbar? Like java Swing has JScrollPane.horizontal_scrollbar_as_needed

回答1:

That works on all cases:

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

Listener scrollBarListener = new Listener () {
  @Override
  public void handleEvent(Event event) {
    Text t = (Text)event.widget;
    Rectangle r1 = t.getClientArea();
    Rectangle r2 = t.computeTrim(r1.x, r1.y, r1.width, r1.height);
    Point p = t.computeSize(SWT.DEFAULT,  SWT.DEFAULT,  true);
    t.getHorizontalBar().setVisible(r2.width <= p.x);
    t.getVerticalBar().setVisible(r2.height <= p.y);
    if (event.type == SWT.Modify) {
      t.getParent().layout(true);
      t.showSelection();
    }
  }
};
text.addListener(SWT.Resize, scrollBarListener);
text.addListener(SWT.Modify, scrollBarListener);

回答2:

You can use StyledText instead of Text. StyledText has method setAlwaysShowScrollBars which can be set to false.

回答3:

@Plamen: great solution thanks. I had the same problem but for a multiline-text with style SWT.WRAP without a horizontal scrollbar.

I had to change a few things in order to make this work properly:

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

Listener scrollBarListener = new Listener (){
    @Override
    public void handleEvent(Event event) {
        Text t = (Text)event.widget;
        Rectangle r1 = t.getClientArea();
        // use r1.x as wHint instead of SWT.DEFAULT
        Rectangle r2 = t.computeTrim(r1.x, r1.y, r1.width, r1.height); 
        Point p = t.computeSize(r1.x,  SWT.DEFAULT,  true); 
        t.getVerticalBar().setVisible(r2.height <= p.y);
        if (event.type == SWT.Modify){
           t.getParent().layout(true);
        t.showSelection();
    }
}};
text.addListener(SWT.Resize, scrollBarListener);
text.addListener(SWT.Modify, scrollBarListener);

回答4:

According to this you can't hide vertical scroll bar, it's OS (Windows) specific L&F. You can get rid of horizontal bar by using SWT.WRAP without SWT.H_SCROLL.

来源：https://stackoverflow.com/questions/8547428/how-to-implement-auto-hide-scrollbar-in-swt-text-component

标签

swt

scrollbar