Sorry I looked at the screenshot and didn't properly read the title. That's
a validation X.
If you're using TextComponet in the onTop mode you can use action() with a
material font icon to clear the text and actionClick() to invoke
setText("").
You can implement it otherwise by using something like this:
TextField field = ...;
Border b = field.getUnselectedStyle().getBorder();
field.getAllStyles().setBorder(null);
Button clearButton.= ...;
clearButton.addActionListener(e -> {
field.stopEditing();
field.setText("");
});
Container clearable = BorderLayout.centerEastWest(field, clearButton, null);
clearable.getUnselectedStyle().setBorder(b);
Notice I could have used a layered layout to place the button on top but I
find this approach to be more reliable.
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