如何请求JWindow临时焦点？(Java 1.7)

Question

是否可以请求JWindow临时焦点？有一个方法protected boolean requestFocusInWindow(boolean temporary)，但是该方法是受保护的。

Answer 1

已经找到扩展JWindow的解决方案类创建了以下方法：

@Override
public boolean requestFocusInWindow(boolean temporary) {
    return super.requestFocusInWindow(temporary);
}

现在，我可以为扩展JWindow的组件请求临时焦点。我正在使用它作为JTextField的自定义弹出菜单，如果在弹出可见时选中插入符号颜色，则会更改插入符号颜色(当然- textField.setCaret(new HighlightCaret());是必需的)：

private class HighlightCaret extends DefaultCaret {

    private final Highlighter.HighlightPainter unfocusedPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.RED);
    private final Highlighter.HighlightPainter focusedPainter = new DefaultHighlighter.DefaultHighlightPainter(new Color(10, 36, 106));
    private boolean isTemporary;

    private HighlightCaret() {
        setBlinkRate(500);
    }

    @Override
    protected Highlighter.HighlightPainter getSelectionPainter() {
        return isTemporary ? unfocusedPainter : focusedPainter;
    }

    @Override
    public void setSelectionVisible(boolean hasFocus) {
        super.setSelectionVisible(false);
        if (hasFocus) {
            super.setSelectionVisible(true);
        }
    }

    @Override
    public void focusGained(FocusEvent e) {
        isTemporary = false;
        super.focusGained(e);
    }

    @Override
    public void focusLost(FocusEvent e) {
        isTemporary = e.isTemporary();
        super.focusLost(e);
    }
}