java – 在ComboBox中为FilteredList设置谓词会影响输入

编辑：我试图在绝望的尝试中覆盖关键监听器来解决问题：

cb.getEditor().addEventFilter(KeyEvent.KEY_PRESSED,e -> {
    TextField editor = cb.getEditor();
    int caretPos = cb.getEditor().getCaretPosition();
    StringBuilder text = new StringBuilder(cb.getEditor().getText());

    // If BACKSPACE is pressed we remove the character at the index
    // before the caret position.
    if (e.getCode().equals(KeyCode.BACK_SPACE)) {
        // BACKSPACE should only remove a character if the caret
        // position isn't zero.
        if (caretPos > 0) {
            text.deleteCharAt(--caretPos);
        }
        e.consume();
    }
    // If DELETE is pressed we remove the character at the caret
    // position.
    else if (e.getCode().equals(KeyCode.DELETE)) {
        // DELETE should only remove a character if the caret isn't
        // positioned after that last character in the text.
        if (caretPos < text.length()) {
            text.deleteCharAt(caretPos);
        }
    }
    // If LEFT key is pressed we move the caret one step to the left.
    else if (e.getCode().equals(KeyCode.LEFT)) {
        caretPos--;
    }
    // If RIGHT key is pressed we move the caret one step to the right.
    else if (e.getCode().equals(KeyCode.RIGHT)) {
        caretPos++;
    }
    // Otherwise we just add the key text to the text.
    // TODO We are currently not handling UP/DOWN keys (should move
    // caret to the end/beginning of the text).
    // TODO We are currently not handling keys that doesn't represent
    // any symbol,like ALT. Since they don't have a text,they will
    // just move the caret one step to the right. In this case,that
    // caret should just hold its current position.
    else {
        text.insert(caretPos++,e.getText());
        e.consume();
    }

    final int finalPos = caretPos;

    // We set the editor text to the new text and finally we move the
    // caret to its new position.
    editor.setText(text.toString());
    Platform.runLater(() -> editor.positionCaret(finalPos));
});

// We just consume KEY_RELEASED and KEY_TYPED since we don't want to
// have duplicated input.
cb.getEditor().addEventFilter(KeyEvent.KEY_RELEASED,e -> {
    e.consume();
});
cb.getEditor().addEventFilter(KeyEvent.KEY_TYPED,e -> {
    e.consume();
});

可悲的是,这也没有解决问题.如果我选择“Three is a number”项,然后尝试删除“Three”中的最后一个“e”,这是text属性将在之间切换的值：

TextProperty: Three is a number
TextPropery: Thre is a number
TextPropery: 

所以它首先删除了正确的字符,但是由于某种原因它删除了整个字符串.如前所述,这只是因为谓词已经设置,而且只有在我第一次选择项目后进行第一次输入时才会发生这种情况.