Databases
StackOverflow2013
Postsdbo
POJPanel Won't Focus After Switching in CardLayout
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POJPanel Won't Focus After Switching in CardLayout
    primarykey
    data
    text
    <p>I am creating a Tetris clone as a personal project. In order to switch between the menus, I am using a <code>CardLayout</code>, but I have come across a problem. When I switch from one menu to the other, the focus does not transfer to the other <code>JPanel</code>. How can I fix this?</p> <p>Here is my JFrame:</p> <pre><code>package com.cgp.tetris; import java.awt.CardLayout; import java.awt.Dimension; import java.awt.Toolkit; import javax.swing.JFrame; import javax.swing.JPanel; public class TetrisFrame extends JFrame { private static final long serialVersionUID = 1L; TetrisMenu tm = new TetrisMenu(); static SinglePlayerMenu spm = new SinglePlayerMenu(); public static CardLayout cl = new CardLayout(); static JPanel parentComponent = new JPanel(cl); public static void main(String[] args) { new TetrisFrame(); } public TetrisFrame() { setTitle("Tetris"); setSize(new Dimension(646, 604)); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setVisible(true); setResizable(false); Dimension d = Toolkit.getDefaultToolkit().getScreenSize(); setLocation((d.width / 2) - 323, (d.height / 2) - 302); parentComponent.add(tm, "tm"); parentComponent.add(spm, "spm"); cl.show(parentComponent, "tm"); add(parentComponent); } public static void replace() { cl.show(parentComponent, "spm"); spm.startClip(); } } </code></pre> <p>Here is my first JPanel/menu:</p> <pre><code>package com.cgp.tetris; import java.awt.Graphics; import java.awt.event.ActionEvent; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; import javax.sound.sampled.AudioInputStream; import javax.sound.sampled.AudioSystem; import javax.sound.sampled.Clip; import javax.sound.sampled.DataLine; import javax.sound.sampled.LineUnavailableException; import javax.sound.sampled.UnsupportedAudioFileException; import javax.swing.AbstractAction; import javax.swing.ActionMap; import javax.swing.InputMap; import javax.swing.JPanel; import javax.swing.KeyStroke; public class TetrisMenu extends JPanel implements Runnable { private static final long serialVersionUID = 1L; private Thread thread; private BufferedImage titletop, titlebottom, selector; private boolean left = true, right = false; private AudioInputStream themestream; private Clip clip; public TetrisMenu() { super(); } public void run() { requestFocus(true); loadImages(); sound(); bind(); while (true) { repaint(); } } private void sound() { File theme = new File("res/theme.wav"); try { themestream = AudioSystem.getAudioInputStream(theme); } catch (UnsupportedAudioFileException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } DataLine.Info info = new DataLine.Info(Clip.class, themestream.getFormat()); clip = null; try { clip = (Clip) AudioSystem.getLine(info); } catch (LineUnavailableException e) { e.printStackTrace(); } try { clip.open(themestream); } catch (LineUnavailableException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } clip.start(); } private void bind() { InputMap im = getInputMap(); ActionMap am = getActionMap(); im.put(KeyStroke.getKeyStroke("LEFT"), "left"); am.put("left", new AbstractAction() { private static final long serialVersionUID = 1L; public void actionPerformed(ActionEvent e) { left = true; right = false; } }); im.put(KeyStroke.getKeyStroke("RIGHT"), "right"); am.put("right", new AbstractAction() { private static final long serialVersionUID = 1L; public void actionPerformed(ActionEvent e) { System.out.println("2"); right = true; left = false; } }); im.put(KeyStroke.getKeyStroke("SPACE"), "space"); am.put("space", new AbstractAction() { private static final long serialVersionUID = 1L; public void actionPerformed(ActionEvent e) { if (left) { TetrisFrame.replace(); clip.stop(); thread.stop();a } } }); } private void loadImages() { try { titletop = ImageIO.read(new File("res/tetrispic.png")); titlebottom = ImageIO.read(new File("res/titlebottom.png")); selector = ImageIO.read(new File("res/selector.png")); } catch (IOException e) { e.printStackTrace(); } } public void addNotify() { super.addNotify(); thread = new Thread(this); thread.start(); } public void paint(Graphics g) { super.paint(g); g.drawImage(titletop, 0, 0, 640, 440, null); g.drawImage(titlebottom, 0, 440, 640, 136, null); if (left) { g.drawImage(selector, 36, 452, 16, 24, null); } else if (right) { g.drawImage(selector, 356, 452, 16, 24, null); } } } </code></pre> <p>Here is my second JPanel/menu:</p> <pre><code>package com.cgp.tetris; import java.awt.Graphics; import java.awt.event.ActionEvent; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; import javax.sound.sampled.AudioInputStream; import javax.sound.sampled.AudioSystem; import javax.sound.sampled.Clip; import javax.sound.sampled.DataLine; import javax.sound.sampled.LineUnavailableException; import javax.sound.sampled.UnsupportedAudioFileException; import javax.swing.AbstractAction; import javax.swing.ActionMap; import javax.swing.InputMap; import javax.swing.JPanel; import javax.swing.KeyStroke; public class SinglePlayerMenu extends JPanel implements Runnable { private static final long serialVersionUID = 1L; private Thread thread; private AudioInputStream themestream; private Clip clip; private BufferedImage base, bi1, bi2, bi3, bi4, bi1s, bi2s, bi3s, bi4s; private boolean typeselected = false, b1 = true, b2 = false, b3 = true, b4 = false, b5 = false, b6 = false; public SinglePlayerMenu() { super(); } public void paint(Graphics g) { super.paint(g); g.drawImage(base, 0, 0, 640, 576, null); if (b1) { g.drawImage(bi1s, 80, 156, 240, 40, null); } else if (!b1) { g.drawImage(bi1, 80, 156, 240, 40, null); } if (b2) { g.drawImage(bi2s, 324, 156, 236, 40, null); } else if (!b2) { g.drawImage(bi2, 324, 156, 236, 40, null); } } public void run() { sound(); loadImages(); bind(); while (true) { repaint(); } } private void bind() { InputMap im = getInputMap(); ActionMap am = getActionMap(); im.put(KeyStroke.getKeyStroke("LEFT"), "left"); am.put("left", new AbstractAction() { private static final long serialVersionUID = 1L; public void actionPerformed(ActionEvent e) { if (!typeselected) { b1 = true; b2 = false; } } }); im.put(KeyStroke.getKeyStroke("RIGHT"), "right"); am.put("right", new AbstractAction() { private static final long serialVersionUID = 1L; public void actionPerformed(ActionEvent e) { if (!typeselected) { b2 = true; b1 = false; } } }); } private void loadImages() { try { base = ImageIO.read(new File("res/base.png")); bi1 = ImageIO.read(new File("res/1.png")); bi2 = ImageIO.read(new File("res/2.png")); bi3 = ImageIO.read(new File("res/3.png")); bi4 = ImageIO.read(new File("res/4.png")); bi1s = ImageIO.read(new File("res/1s.png")); bi2s = ImageIO.read(new File("res/2s.png")); bi3s = ImageIO.read(new File("res/3s.png")); bi4s = ImageIO.read(new File("res/4s.png")); } catch (IOException e) { e.printStackTrace(); } } private void sound() { File theme = new File("res/playtheme.wav"); try { themestream = AudioSystem.getAudioInputStream(theme); } catch (UnsupportedAudioFileException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } DataLine.Info info = new DataLine.Info(Clip.class, themestream.getFormat()); clip = null; try { clip = (Clip) AudioSystem.getLine(info); } catch (LineUnavailableException e) { e.printStackTrace(); } try { clip.open(themestream); } catch (LineUnavailableException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public void addNotify() { super.addNotify(); thread = new Thread(this); thread.start(); } public void startClip() { clip.loop(Clip.LOOP_CONTINUOUSLY); } } </code></pre> <p>Thanks in advance!</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USkleopatra
    1. USCg2916
    plurals
    1. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POJPanel Won't Focus After Switching in CardLayout
      1. This table or related slice is empty.
      1. VTDownMod
    2. VO
      singulars
      1. POJPanel Won't Focus After Switching in CardLayout
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POJPanel Won't Focus After Switching in CardLayout
      1. This table or related slice is empty.
      1. VTUpMod
    1. COFor better help sooner, post an [SSCCE](http://sscce.org/).
      singulars
      1. POJPanel Won't Focus After Switching in CardLayout
      1. USAndrew Thompson
    2. COComing up! Just a minute.
      singulars
      1. POJPanel Won't Focus After Switching in CardLayout
      1. USCg2916
    3. COFor some reason, the files won't package correctly into the JAR. Just a minute.
      singulars
      1. POJPanel Won't Focus After Switching in CardLayout
      1. USCg2916
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload