我进行了尝试和搜索,似乎无法弄清楚我认为会是什么简单的事情,即在我的小型GUI应用程序启动时,即具有“启动”按钮的焦点,因此用户所要做的就是按回车键/Return键,其效果与使用鼠标单击“开始”按钮时的效果相同。这是我的代码。谢谢你的帮助 :)
private void initialize() {
// Launch the frame:
frame = new JFrame();
frame.setTitle("Welcome!");
frame.setSize(520, 480);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Add the image:
ImageIcon heroShotImage = new ImageIcon("heroShot.jpg");
JPanel heroShotPanel = new JPanel();
JLabel heroShot = new JLabel(heroShotImage);
heroShotPanel.add(heroShot);
// Create a panel to hold the "Start" button:
JPanel submitPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
// Create the "Start" button, which launches business logic and dialogs:
JButton start = new JButton("Start");
start.setToolTipText("Click to use library");
start.setFocusable(true); // How do I get focus on button on App launch?
start.requestFocus(true); // Tried a few things and can't get it to work.
// Listen for user actions and do some basic validation:
start.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
// THE APP's LOGIC GOES HERE...
}
// Finish setting up the GUI and its components, listeners, and actions:
submitPanel.add(start);
frame.getContentPane().add(heroShotPanel, BorderLayout.NORTH);
frame.getContentPane().add(submitPanel, BorderLayout.SOUTH);
}
最佳答案
尝试这段代码。我所做的就是最后移动requestFocus()
方法。
基本上,这是您必须做的两件事,以使其在按下Enter键时做出响应并使其默认处于焦点状态。
frame.getRootPane().setDefaultButton(start);
start.requestFocus();
package sof;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class TestFrame {
public static void main(String[] args) {
// Launch the frame:
JFrame frame = new JFrame();
frame.setTitle("Welcome!");
frame.setSize(520, 480);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Add the image:
ImageIcon heroShotImage = new ImageIcon("heroShot.jpg");
JPanel heroShotPanel = new JPanel();
JLabel heroShot = new JLabel(heroShotImage);
heroShotPanel.add(heroShot);
// Create a panel to hold the "Start" button:
JPanel submitPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
JButton start = new JButton("Start");
start.setToolTipText("Click to use library");
start.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("I AM PRESSED");
}
});
submitPanel.add(start);
frame.getContentPane().add(heroShotPanel, BorderLayout.NORTH);
frame.getContentPane().add(submitPanel, BorderLayout.SOUTH);
frame.setVisible(true);
frame.getRootPane().setDefaultButton(start);
start.requestFocus();
}
}