java - 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(booleantemporary)，但该方法是 protected 。

Answer 1

已经找到了解决方案 - 在扩展 JWindow 的类中创建了此方法:

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

现在我可以请求扩展 JWindow 的组件的临时焦点。我将它用于 JTextField 的自定义弹出菜单，如果在弹出窗口可见时选择插入符号颜色，则会更改(当然 - textField.setCaret(newhighlightCaret()); 是必要的):

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);
    }
}