退出基于文本字段的搜索栏
Escaping out of text field based search bar
我有一个带有搜索栏的菜单栏,它是用 JTextField
实现的,如下所示:
public class Ui_Frame {
private static JFrame f;
private static DrawPanel drawPanel;
public static void main(String[] args) {
SwingUtilities.invokeLater(Ui_Frame::createAndShowGUI);
}
private static void createAndShowGUI() {
f = new JFrame("Frame");
drawPanel = new DrawPanel(); //A class that extends JPanel where I draw
JMenuBar menubar = new JMenuBar();
JMenu j_menu_data = new JMenu("Data");
JTextField j_menu_searchfield = new JTextField();
j_menu_searchfield.setSize(new Dimension(100,20));
menubar.add(j_menu_data);
menubar.add(j_menu_searchfield);
f.setJMenuBar(menubar);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(drawPanel);
f.pack();
f.setVisible(true);
}
}
我有 KeyListener
用于 DrawPanel
class,这些工作正常。问题是,当我将搜索栏 JTextField
添加到菜单栏时,我写的所有内容都会被写入文本字段,而我的关键侦听器不会触发。我无法“退出”文本字段,所以如果我在我正在绘制的区域内单击,我按下的所有键仍会放入文本字段中。
我已尝试 getFocus()
DrawPanel
但无济于事。
如何解决?
编辑:
DrawPanel class 所以你有所有你需要的 classes 运行 它:
public class DrawPanel extends JPanel {
public DrawPanel() {
addKeyListener(new CustomKeyListener());
this.setBackground(new Color(220,220,220));
setBorder(BorderFactory.createLineBorder(Color.black));
setFocusable(true);
setVisible(true);
}
public Dimension getPreferredSize() {
return new Dimension(500, 500);
}
protected void paintComponent(Graphics g) {
Graphics2D g2D = (Graphics2D) g;
super.paintComponent(g2D);
}
class CustomKeyListener implements KeyListener {
@Override
public void keyTyped(KeyEvent e) {
if (e.getKeyChar() == KeyEvent.VK_SPACE) {
System.out.println("Pressed SPACE");
}
}
@Override
public void keyPressed(KeyEvent e) { }
@Override
public void keyReleased(KeyEvent e) { }
}
}
当您启动 Swing 应用程序时,JTextField
最初具有键盘焦点。您知道这一点是因为您看到光标在 JTextField
.
中闪烁
用鼠标单击 DrawPanel
不会将键盘焦点转移到 DrawPanel
。你知道这一点是因为在 DrawPanel
内单击鼠标后,光标仍在 JTextField
.
内闪烁
您可以通过按键盘上的 TAB 键将键盘焦点从 JTextField
转移到 DrawPanel
,因为这是默认的焦点遍历键。您知道 JTextField
不再具有键盘焦点,因为其中没有闪烁的光标。
如果你真的想让DrawPanel
通过在其中点击鼠标获得键盘焦点,你可以在DrawPanel
中添加一个MouseListener
,如下面的代码所示本质上是您的代码(对于 class DrawPanel
)添加了 MouseListener
。
请注意,我没有更改 class Ui_Frame
。
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.BorderFactory;
import javax.swing.JPanel;
public class DrawPanel extends JPanel implements MouseListener {
public DrawPanel() {
addKeyListener(new CustomKeyListener());
addMouseListener(this);
this.setBackground(new Color(220,220,220));
setBorder(BorderFactory.createLineBorder(Color.black));
setFocusable(true);
setVisible(true);
}
public Dimension getPreferredSize() {
return new Dimension(500, 500);
}
protected void paintComponent(Graphics g) {
Graphics2D g2D = (Graphics2D) g;
super.paintComponent(g2D);
}
class CustomKeyListener implements KeyListener {
@Override
public void keyTyped(KeyEvent e) {
if (e.getKeyChar() == KeyEvent.VK_SPACE) {
System.out.println("Pressed SPACE");
}
}
@Override
public void keyPressed(KeyEvent e) { }
@Override
public void keyReleased(KeyEvent e) { }
}
@Override
public void mouseClicked(MouseEvent mouseEvent) {
System.out.println(this.requestFocusInWindow());
}
@Override
public void mousePressed(MouseEvent mouseEvent) {
}
@Override
public void mouseReleased(MouseEvent mouseEvent) {
}
@Override
public void mouseEntered(MouseEvent mouseEvent) {
}
@Override
public void mouseExited(MouseEvent mouseEvent) {
}
}
注意方法requestFocusInWindow()
returnstrue
如果成功的话
我有一个带有搜索栏的菜单栏,它是用 JTextField
实现的,如下所示:
public class Ui_Frame {
private static JFrame f;
private static DrawPanel drawPanel;
public static void main(String[] args) {
SwingUtilities.invokeLater(Ui_Frame::createAndShowGUI);
}
private static void createAndShowGUI() {
f = new JFrame("Frame");
drawPanel = new DrawPanel(); //A class that extends JPanel where I draw
JMenuBar menubar = new JMenuBar();
JMenu j_menu_data = new JMenu("Data");
JTextField j_menu_searchfield = new JTextField();
j_menu_searchfield.setSize(new Dimension(100,20));
menubar.add(j_menu_data);
menubar.add(j_menu_searchfield);
f.setJMenuBar(menubar);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(drawPanel);
f.pack();
f.setVisible(true);
}
}
我有 KeyListener
用于 DrawPanel
class,这些工作正常。问题是,当我将搜索栏 JTextField
添加到菜单栏时,我写的所有内容都会被写入文本字段,而我的关键侦听器不会触发。我无法“退出”文本字段,所以如果我在我正在绘制的区域内单击,我按下的所有键仍会放入文本字段中。
我已尝试 getFocus()
DrawPanel
但无济于事。
如何解决?
编辑: DrawPanel class 所以你有所有你需要的 classes 运行 它:
public class DrawPanel extends JPanel {
public DrawPanel() {
addKeyListener(new CustomKeyListener());
this.setBackground(new Color(220,220,220));
setBorder(BorderFactory.createLineBorder(Color.black));
setFocusable(true);
setVisible(true);
}
public Dimension getPreferredSize() {
return new Dimension(500, 500);
}
protected void paintComponent(Graphics g) {
Graphics2D g2D = (Graphics2D) g;
super.paintComponent(g2D);
}
class CustomKeyListener implements KeyListener {
@Override
public void keyTyped(KeyEvent e) {
if (e.getKeyChar() == KeyEvent.VK_SPACE) {
System.out.println("Pressed SPACE");
}
}
@Override
public void keyPressed(KeyEvent e) { }
@Override
public void keyReleased(KeyEvent e) { }
}
}
当您启动 Swing 应用程序时,JTextField
最初具有键盘焦点。您知道这一点是因为您看到光标在 JTextField
.
用鼠标单击 DrawPanel
不会将键盘焦点转移到 DrawPanel
。你知道这一点是因为在 DrawPanel
内单击鼠标后,光标仍在 JTextField
.
您可以通过按键盘上的 TAB 键将键盘焦点从 JTextField
转移到 DrawPanel
,因为这是默认的焦点遍历键。您知道 JTextField
不再具有键盘焦点,因为其中没有闪烁的光标。
如果你真的想让DrawPanel
通过在其中点击鼠标获得键盘焦点,你可以在DrawPanel
中添加一个MouseListener
,如下面的代码所示本质上是您的代码(对于 class DrawPanel
)添加了 MouseListener
。
请注意,我没有更改 class Ui_Frame
。
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.BorderFactory;
import javax.swing.JPanel;
public class DrawPanel extends JPanel implements MouseListener {
public DrawPanel() {
addKeyListener(new CustomKeyListener());
addMouseListener(this);
this.setBackground(new Color(220,220,220));
setBorder(BorderFactory.createLineBorder(Color.black));
setFocusable(true);
setVisible(true);
}
public Dimension getPreferredSize() {
return new Dimension(500, 500);
}
protected void paintComponent(Graphics g) {
Graphics2D g2D = (Graphics2D) g;
super.paintComponent(g2D);
}
class CustomKeyListener implements KeyListener {
@Override
public void keyTyped(KeyEvent e) {
if (e.getKeyChar() == KeyEvent.VK_SPACE) {
System.out.println("Pressed SPACE");
}
}
@Override
public void keyPressed(KeyEvent e) { }
@Override
public void keyReleased(KeyEvent e) { }
}
@Override
public void mouseClicked(MouseEvent mouseEvent) {
System.out.println(this.requestFocusInWindow());
}
@Override
public void mousePressed(MouseEvent mouseEvent) {
}
@Override
public void mouseReleased(MouseEvent mouseEvent) {
}
@Override
public void mouseEntered(MouseEvent mouseEvent) {
}
@Override
public void mouseExited(MouseEvent mouseEvent) {
}
}
注意方法requestFocusInWindow()
returnstrue
如果成功的话