Пример #1
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 public void focusGained(FocusEvent e) {
   Component c = e.getComponent();
   if (c instanceof TextField) ((TextField) c).selectAll();
 }
Пример #2
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 public void focusLost(FocusEvent e) {
   Component c = e.getComponent();
   if (c instanceof TextField) ((TextField) c).select(0, 0);
 }
Пример #3
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 public void focusGained(FocusEvent e) {
   fieldWithFocus = e.getSource();
   if (fieldWithFocus == widthField) constainAspectRatio = true;
   else if (fieldWithFocus == yField) constainAspectRatio = false;
 }