Java JPanel wächst mit JTextArea

Question

Ich habe etwas mit JPanel getestet. Als ich der darin enthaltenen JTextArea einen zufälligen Text hinzufügte, vergrößerte sich die Größe des JPanels bis zum Erreichen der Kante.

Wie behalte ich den Text im JPanel, ohne ihn zu strecken?

public class Game 
{ 
TitleScreenHandler tsHandler = new TitleScreenHandler(); 
ChoiceHandler choiceHandler = new ChoiceHandler(); 
ComponentHandler compHandler = new ComponentHandler();  

GridBagConstraints gbc = new GridBagConstraints(); 
Border whiteline = BorderFactory.createLineBorder(Color.WHITE); 

JFrame window; 
Container con; 
JPanel titlePanel , startPanel, mainTextPanel, choiceButtonPanel, playerPanel; 
JLabel titleLabel, hpLabel, hpLabelNumber, weaponLabel, weaponLabelName; 

public static JButton startButton, choice1,choice2,choice3,choice4,choice5,choice6,choice7,choice8; 

public static JTextArea mainTextArea; 

Font titleFont = new Font("Times New Roman", Font.PLAIN, 100); 
Font normalFont = new Font("Times New Roman", Font.PLAIN, 30); 

public static String playerName; 
public static String weapon,position; 

public static int playerHP; 
public static int weaponDamage; 

public static void main(String[] args) 
{ 
    new Game(); 

} 

public Game() 
{ 
    window = new JFrame(); 
    window.setSize(1440,900); 
    window.setTitle("W: " + window.getWidth() + " H: " + window.getHeight()); 
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    window.getContentPane().setBackground(Color.black); 
    window.setLayout(new GridBagLayout()); 

    con = window.getContentPane(); 

    //Panels are used to make sections in the window (Background) 
    //Labels are used to write in the sections/panels (Foreground) 
    //Buttons can be pressed inside Panels 

    //To make a text you need to design a panel, design its size/color, 
    //Design its text the same way, then add it to the panel 

    titlePanel = new JPanel(); 
    titlePanel.setBounds(100, 100, 1080 , 150); 
    titlePanel.setBackground(Color.black);  

    titleLabel = new JLabel("Adventure"); 
    titleLabel.setForeground(Color.white); 
    titleLabel.setFont(titleFont); 

    startPanel = new JPanel(); 
    startPanel.setBounds(540, 600, 200, 100); 
    startPanel.setBackground(Color.black); 

    startButton = new JButton("START"); 
    startButton.setBackground(Color.black); 
    startButton.setForeground(Color.white); 
    startButton.setFont(normalFont); 
    startButton.addActionListener(tsHandler); 

    window.addComponentListener(compHandler); 

    titlePanel.add(titleLabel); 
    startPanel.add(startButton); 

    con.add(titlePanel, gbc); 

    gbc.gridx = 0; 
    gbc.gridy = 2; 

    con.add(startPanel, gbc); 

    window.setVisible(true); 
} 

public void createGameScreen() 
{ 
    titlePanel.setVisible(false); 
    startButton.setVisible(false); 

    mainTextPanel = new JPanel(); 
    //mainTextPanel.setBounds(100, 100, 1080, 250); 
    mainTextPanel.setBackground(Color.black); 
    mainTextPanel.setBorder(whiteline); 

    mainTextArea = new JTextArea("This is the main text area"); 
    mainTextArea.setBounds(100,100,1080,250); 
    mainTextArea.setBackground(Color.black); 
    mainTextArea.setForeground(Color.white); 
    mainTextArea.setLayout(new GridLayout()); 
    mainTextArea.setFont(normalFont); 
    mainTextArea.setLineWrap(true); 
    mainTextArea.setWrapStyleWord(true); 

    playerPanel = new JPanel(); 
    playerPanel.setBounds(100, 100, 1080, 50); 
    playerPanel.setBackground(Color.blue); 
    playerPanel.setLayout(new GridLayout(1,4)); 

    choiceButtonPanel = new JPanel(); 
    choiceButtonPanel.setBounds(500, 350, 300, 250); 
    choiceButtonPanel.setLayout(new GridLayout(2,4, 50, 50)); 
    choiceButtonPanel.setBackground(Color.red); 

    choice1 = new JButton("Choice 1"); 
    choice1.setBackground(Color.black); 
    choice1.setForeground(Color.white); 
    choice1.setFont(normalFont); 
    choice1.setFocusPainted(false); 
    choice1.addActionListener(choiceHandler); 
    choice1.setActionCommand("c1"); 

    choiceButtonPanel.add(choice1); 

    choice2 = new JButton("Choice 2"); 
    choice2.setBackground(Color.black); 
    choice2.setForeground(Color.white); 
    choice2.setFont(normalFont); 
    choice2.setFocusPainted(false); 
    choice2.addActionListener(choiceHandler); 
    choice2.setActionCommand("c2"); 

    choiceButtonPanel.add(choice2); 

    choice3 = new JButton("Choice 3"); 
    choice3.setBackground(Color.black); 
    choice3.setForeground(Color.white); 
    choice3.setFont(normalFont); 
    choice3.setFocusPainted(false); 
    choice3.addActionListener(choiceHandler); 
    choice3.setActionCommand("c3"); 

    choiceButtonPanel.add(choice3); 

    choice4 = new JButton("Choice 4"); 
    choice4.setBackground(Color.black); 
    choice4.setForeground(Color.white); 
    choice4.setFont(normalFont); 
    choice4.setFocusPainted(false); 
    choice4.addActionListener(choiceHandler); 
    choice4.setActionCommand("c4"); 

    choiceButtonPanel.add(choice4); 

    choice5 = new JButton("Choice 5"); 
    choice5.setBackground(Color.black); 
    choice5.setForeground(Color.white); 
    choice5.setFont(normalFont); 
    choice5.setFocusPainted(false); 
    choice5.addActionListener(choiceHandler); 
    choice5.setActionCommand("c5"); 

    choiceButtonPanel.add(choice5); 

    choice6 = new JButton("Choice 6"); 
    choice6.setBackground(Color.black); 
    choice6.setForeground(Color.white); 
    choice6.setFont(normalFont); 
    choice6.setFocusPainted(false); 
    choice6.addActionListener(choiceHandler); 
    choice6.setActionCommand("c6"); 

    choiceButtonPanel.add(choice6); 

    choice7 = new JButton("Choice 7"); 
    choice7.setBackground(Color.black); 
    choice7.setForeground(Color.white); 
    choice7.setFont(normalFont); 
    choice7.setFocusPainted(false); 
    choice7.addActionListener(choiceHandler); 
    choice7.setActionCommand("c7"); 

    choiceButtonPanel.add(choice7); 

    choice8 = new JButton("Choice 8"); 
    choice8.setBackground(Color.black); 
    choice8.setForeground(Color.white); 
    choice8.setFont(normalFont); 
    choice8.setFocusPainted(false); 
    choice8.addActionListener(choiceHandler); 
    choice8.setActionCommand("c8"); 

    choiceButtonPanel.add(choice8); 

    gbc.anchor = GridBagConstraints.PAGE_END; 
    gbc.fill = GridBagConstraints.BOTH; 

    gbc.gridx = 0; 
    gbc.gridy = 0; 

    con.add(playerPanel,gbc); 

    gbc.fill = GridBagConstraints.HORIZONTAL; 
    //gbc.ipadx = 750; 
    gbc.ipady = 1000; 
    gbc.gridwidth = 2; 
    gbc.gridx = 1; 
    gbc.gridy = 0; 
    con.add(mainTextPanel,gbc); 

    gbc.fill = GridBagConstraints.NONE; 
    gbc.ipadx = 0; 
    gbc.ipady = 0; 
    gbc.gridx = 1; 
    gbc.gridy = 5; 
    con.add(choiceButtonPanel,gbc); 

    hpLabel = new JLabel("HP: "); 
    hpLabel.setFont(normalFont); 
    hpLabel.setForeground(Color.white); 

    hpLabelNumber = new JLabel(); 
    hpLabelNumber.setFont(normalFont); 
    hpLabelNumber.setForeground(Color.white); 

    weaponLabel = new JLabel("Weapon: "); 
    weaponLabel.setFont(normalFont); 
    weaponLabel.setForeground(Color.white); 

    weaponLabelName = new JLabel(); 
    weaponLabelName.setFont(normalFont); 
    weaponLabelName.setForeground(Color.white); 

    playerPanel.add(hpLabel); 
    playerPanel.add(hpLabelNumber); 
    playerPanel.add(weaponLabel); 
    playerPanel.add(weaponLabelName); 
    mainTextPanel.add(mainTextArea, BorderLayout.PAGE_START); 

    playerSetup(); 

} 


public void playerSetup() 
{ 
    playerHP = 15; 
    weapon = "Fists"; 
    weaponLabelName.setText(weapon); 
    hpLabelNumber.setText("" + playerHP); 

    ForestEvents.townGate(); 
} 

/*public void townGate() 
{ 
    position = "towngate"; 

    mainTextArea.setText("You are at the gates of the town. A guard is standing in front of you. What do you do?"); 
    choice1.setText("Talk to the Guard"); 
    choice2.setText("Attack the Guard"); 
    choice3.setText("Leave"); 
    choice4.setText(""); 
}*/ 

public void talkGuard() 
{ 
    position = "talkguard"; 

    mainTextArea.setText("Guard: Hello Stranger. I have never seen you before. I'm sorry but I cannot let you enter."); 

    choice1.setText("Go Back"); 
    choice2.setText(""); 
    choice3.setText(""); 
    choice4.setText(""); 

} 

public void attackGuard() 
{ 
    position = "attackguard"; 

    mainTextArea.setText("Guard: HOW DARE YOU!\nThe guard fought back and hit you hard.\n(You received 3 damage)"); 
    playerHP -= 3; 
    hpLabelNumber.setText("" + playerHP); 

    choice1.setText("Go Back"); 
    choice2.setText(""); 
    choice3.setText(""); 
    choice4.setText(""); 

} 

public void crossRoad() 
{ 
    position = "crossroads"; 

    mainTextArea.setText("You are at the crossroad.\n Go south to go back to the town."); 

    choice1.setText("Go North"); 
    choice2.setText("Go East"); 
    choice3.setText("Go South"); 
    choice4.setText("Go West"); 

} 

public class ComponentHandler implements ComponentListener 
{ 
    public void componentResized(ComponentEvent e) 
    { 
     Component c = (Component)e.getSource(); 
     window.setTitle("W: " + c.getWidth() + " H: " + c.getHeight()); 


    } 

    @Override 
    public void componentHidden(ComponentEvent e) 
    { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void componentMoved(ComponentEvent e) 
    { 

    } 

    @Override 
    public void componentShown(ComponentEvent e) 
    { 

    } 
} 

public class TitleScreenHandler implements ActionListener 
{ 
    public void actionPerformed(ActionEvent event) 
    { 
     createGameScreen(); 
    } 
} 

public class ChoiceHandler implements ActionListener 
{ 
    public void actionPerformed(ActionEvent event) 
    { 
     String yourChoice = event.getActionCommand(); 

     switch (position) 
     { 
      case "towngate": 
       switch(yourChoice) 
       { 
       case "c1": 
        talkGuard(); 
        break; 
       case "c2": 
        attackGuard(); 
        break; 
       case "c3": 
        crossRoad(); 
        break; 
       case "c4": 
        break; 
       } 
       break; 

      case "talkguard": 
       switch(yourChoice) 
       { 
       case "c1": 
        ForestEvents.townGate(); 
        break; 
       } 
       break; 

      case "attackguard": 
       switch(yourChoice) 
       { 
       case "c1": 
        ForestEvents.townGate(); 
        break; 
       } 
       break; 

      case "crossroad": 
       switch(yourChoice) 
       { 
       case"c1": 
        break; 
       case"c2": 
        break; 
       case"c3": 
        ForestEvents.townGate(); 
        break; 
       case"c4": 
        break; 
       } 
       break; 


     } 

    } 

} 

} 

Edit: der Rest des Codes hinzugefügt und hinzugefügt, um das Textfeld an die scrollpane und die scrollpane auf die JPanel nun den Text ist nicht in der Platte zeigt nach oben.

import javax.swing.JTextArea; 

public class ForestEvents 
{ 
String pos; 
int hp; 

public ForestEvents() 
{ 
    pos = Game.position; 
    hp = Game.playerHP; 
} 

public static void townGate() 
{ 
    Game.position = "towngate"; 

    Game.mainTextArea.setText("You are at the gates of the town. A guard is standing in front of you. What do you do? \na\nas\n\n\n\n\\n" 
      + "\n\n\n\1\n1\n\n\n\n\n\\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n1\n1\n2\n2\n3\n4\n6"); 
    Game.choice1.setText("Talk to the Guard"); 
    Game.choice2.setText("Attack the Guard"); 
    Game.choice3.setText("Leave"); 
    Game.choice4.setText(""); 
} 





} 

Answer 1

Sie wollen Ihre JTextArea in JScrollPane zu bekommen, wie Adeel in den Kommentaren gesagt (+1), dann mit GridBagLayout steuern. Keine Notwendigkeit, Komponentengrenzen, bevorzugte Größe usw. zu setzen. Wenn Sie GridBagLayout verwenden möchten, müssen Sie lernen, wie weights mit fill und anchor arbeiten. Im nachfolgenden Code Änderung gbc.fillHORIZONTAL-VERTICAL und Swap weights verwenden ich für das Hinzufügen von scroll zu window (so soll es weightx = 0 sein, y = 1) oder Änderung BOTH füllen und beiden Gewichte gleich 1 machen (in diesem Fall, Sie kann diese leere JLabel kommentieren ich am Ende hinzugefügt). Beobachten und lernen.

In Ihrem Code werden keine Gewichte festgelegt. Also, wie Sie vielleicht geraten haben, hat alles das gleiche Gewicht. mainTextArea wird hinzugefügt, während gbc.fill ist HORIZONTAL, keine Gewichte und ist nicht innerhalb JScrollPane - deshalb dehnt es. Und sei vorsichtig mit iPads.

SSCCE (Kommentare in Code)

public class DontStretchMyTextArea { 

    public static void main(String[] args) { 
     JFrame window = new JFrame(); 
     window.setSize(1440, 900); 
     window.setTitle("W: " + window.getWidth() + " H: " + window.getHeight()); 
     window.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); 

     window.setLayout(new GridBagLayout()); 

     GridBagConstraints gbc = new GridBagConstraints(); 

     gbc.fill = GridBagConstraints.HORIZONTAL; 
     gbc.anchor = GridBagConstraints.NORTH; 
     gbc.insets = new Insets(10, 10, 10, 10); 

     JTextArea mainTextArea = new JTextArea("This is the main text area" , 10 , 30); //here you can set how many rows/columns you want, 
                          //but anyway GridBagLayout will recalculate size of component 
                          //based on gbc.fill, weights and surrounding components 
     //mainTextArea.setLayout(new GridLayout()); 
     mainTextArea.setLineWrap(true); 
     mainTextArea.setWrapStyleWord(true); 

     JScrollPane scroll = new JScrollPane(mainTextArea); 
     scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); 

      JPanel panel = new JPanel(); 
      panel.setLayout(new GridBagLayout()); 
      GridBagConstraints panelGBC = new GridBagConstraints(); 

      panelGBC.weightx = 1;     //I want to fill whole panel with JTextArea 
      panelGBC.weighty = 1;     //so both weights =1 
      panelGBC.fill = GridBagConstraints.BOTH; //and fill is set to BOTH 

      panel.add(scroll, panelGBC); 
      panel.setBackground(Color.gray);//this shouldn't be visible 


     gbc.weightx = 1; 
     gbc.weighty = 0; 
     window.add(panel, gbc); 

     gbc.weightx = 1; 
     gbc.weighty = 1; 
     gbc.gridx++; 
     window.add(new JLabel(), gbc); //GridBagLayout always needs component with both weights =1 

     SwingUtilities.invokeLater(() -> { //we get our frame on EDT 
      window.pack(); 
      window.setVisible(true); 
     }); 
    } 
} 

How to use GridBagLayout

Sie auch scroll direkt an window hinzufügen können. panel wurde nur zu Illustrationszwecken erstellt.