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Understanding mnemonic [message #1148493]

Mon, 21 October 2013 14:50

Matthias Nick

Messages: 197
Registered: August 2013

Senior Member

Hi,

I have a label and a textfield, the label's text has a mnemonic (&label).

My question is, how does SWT determine to which field the label belongs?
In my case, when I press "alt+l", the textfield gets focus. But I haven't specified that the label belongs to the textfield. In Swing there is a method:

label.setLabelFor(textfield);

In my special case, the label and textfield are not directly next to each other, which means that when I press "alt+l", the textfield does not get the focus. Is there a way to intercept the mnemonic and implement some custom logic?

Thank you very much in advance

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Re: Understanding mnemonic [message #1170317 is a reply to message #1148493]

Mon, 04 November 2013 15:05

Matthias Nick

Messages: 197
Registered: August 2013

Senior Member

Okay, I have solved it by adding a new traverse listener:

addTraverseListener(new TraverseListener() {
 @Override
  public void keyTraversed(TraverseEvent e) {
   setFocusOnMnemonic(e);
  }
});

protected void setFocusOnMnemonic(TraverseEvent e) {
 if (e.detail == SWT.TRAVERSE_MNEMONIC) {
  char pressedMnemonic = e.character;
  if (Character.toLowerCase(StringUtility.getMnemonic(getText())) != pressedMnemonic) {
    return;
  }

  if (m_labelFor != null) {
   if (m_labelFor.setFocus()) {
    e.doit = true;
    e.detail = SWT.TRAVERSE_NONE;
   }
  }
 }
}

m_labelFor represents the Control which shall get the focus

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