将JOptionPane.showConfirmDialog
与自定义组件JPanel
一起使用,我希望在打开时专注于特定组件(JPasswordField
)。如何实现这一目标?
代码示例:当对话框打开时JPasswordField pf
应该有焦点...
import java.awt.BorderLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
public class JTestOptionDialog {
public static void main(String[] args) {
JFrame frame = new JFrame("Test showConfirmDialog");
frame.getContentPane().setLayout(new BorderLayout());
frame.getContentPane().add(new JPanel());
frame.setLocationRelativeTo(null);
frame.setVisible(true);
JLabel label = new JLabel("<html><body>To access insert <b>password</b></body></html>");
JPasswordField pf = new JPasswordField();
JPanel panel = new JPanel(new GridBagLayout());
panel.add(label,new GridBagConstraints(0, 0, 1, 1, 1.0, 0.0, GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(2, 2, 2, 2), 0, 0));
panel.add(pf,new GridBagConstraints(0, 1, 1, 1, 1.0, 0.0, GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(2, 2, 2, 2), 0, 0));
pf.requestFocus(); //THIS IS WHAT I LIKE TO HAVE FOCOUS WHEN DIALOG OPENS
int retVal = JOptionPane.showConfirmDialog(frame,panel,"Impostazioni",JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);
System.out.println(retVal);
}
}
是否有可能在某种程度上请求专注于我想要的JPasswordField pf
或者我需要&#34;直接创建和使用JOptionPane&#34;?
作为我试过的一个注释(似乎是合乎逻辑的)
pf.addComponentListener(new ComponentAdapter(){
public void componentShown(ComponentEvent ce){
pf.requestFocus(); //pf.requestFocusInWindow();
}
});
但这也没有运气......
答案 0 :(得分:4)
我通过添加和删除监听器找到了一种方法,但我并不喜欢它。我愿意接受更好的解决方案。
pf.addAncestorListener(new AncestorListener() {
public void ancestorRemoved(AncestorEvent event) {}
public void ancestorMoved(AncestorEvent event) {}
public void ancestorAdded(final AncestorEvent event) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
event.getComponent().requestFocusInWindow();
event.getComponent().removeAncestorListener(this);
}
});
}
});
答案 1 :(得分:2)
您对自己的答案非常接近解决方案。虽然添加/删除是混乱的,但你是对的。这有点整洁。
试试这个:
JOptionPane.showConfirmDialog()
请确保在致电{{1}}
之前填写该代码如果您需要更多信息Setting component focus in JOptionPane.showOptionDialog()
,我在此处找到了答案