我正在用JPanel测试一些东西。当我将随机文本添加到其中的JTextArea时，它会不断增加JPanel的大小，直到它到达边缘。
如何在不拉伸文本的情况下将文本保留在JPanel中？
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;
}
}
}
}
编辑：添加其余代码并将textarea添加到滚动窗格，将滚动窗格添加到Jpanel，现在文本未显示在面板中。
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("");
}
}
答案 0 :(得分：1)
您希望将JTextArea转换为JScrollPane，正如Adeel在评论（+1）中所述，然后使用GridBagLayout控制它。无需设置组件范围，首选大小等。如果要使用GridBagLayout，您必须了解weights如何使用fill和anchor。在下面的代码中，将gbc.fill HORIZONTAL更改为VERTICAL并交换weights我用于将scroll添加到window（因此它应该是{{1} }} = 0，weightx = 1），或将填充更改为y并使两个权重等于1（在这种情况下，您可以注释掉我添加的空BOTH结束）。观察和学习。
在您的代码中，您没有设置权重。所以，正如你可能已经猜到的那样，一切都有相同的重量。在JLabel为mainTextArea时添加了gbc.fill，没有权重且不在HORIZONTAL内 - 这就是它延伸的原因。小心ipads。
SSCCE（代码注释）
JScrollPane您还可以将 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);
});
}
}
直接添加到scroll。 window仅用于说明目的。