[英]resize JFrame automatically with JPanel Java
我正在實施對掃雷游戲的改變。 其中一個問題就是難度。 我已經設法做到這一點並且它的工作,但隨着游戲板(在它自己的Jpanel中)變得更大和更小(取決於難度),我無法讓JFrame自動調整大小。 我在用:
setPreferredSize(new Dimension(WIDTH, HEIGHT));
設置窗口的初始大小,但這使它真的很小,就像只顯示JMenuBar中的'File'一詞一樣。 我必須手動調整大小。
我在ActionListener事件上嘗試了setSize()和frame.pack()之類的東西,但我似乎無法讓它調整大小。
關於使用什么代碼/方法的任何提示。
編輯:已發布的代碼
package mines;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class SetupFrame extends JFrame {
private final int WIDTH = 600;
private final int HEIGHT = 500;
public JFrame frame;
public JMenuBar menubar;
public JMenu file;
public JMenu levels;
public JMenu help;
public JMenuItem login;
public JMenuItem save;
public JMenuItem resume;
public JMenuItem exit;
public JMenuItem easy;
public JMenuItem medium;
public JMenuItem hard;
private JLabel statusbar;
public JPanel main;
public JPanel buttonPanel;
public JPanel saved;
public JPanel game;
public Board mineGame;
public JButton ngButton;
public JButton undoButton;
public JButton redoButton;
public JTabbedPane tp;
public String[] levelPicker;
public JComboBox levelSelect;
public JFileChooser chooser;
public String filename;
public int difficulty;
public SetupFrame(){
frame = new JFrame();
String filename = JOptionPane.showInputDialog(frame, "Enter Your Name.");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setTitle("Minesweeper");
//menubar, menus, menu items
menubar = new JMenuBar();
setJMenuBar(menubar);
file = new JMenu("File");
help = new JMenu("Help");
menubar.add(file);
menubar.add(help);
login = new JMenuItem("Login..");
save = new JMenuItem("Save..");
resume = new JMenuItem("Resume..");
exit = new JMenuItem("Exit");
file.add(login);
file.add(save);
file.add(resume);
file.addSeparator();
file.add(exit);
statusbar = new JLabel("");
chooser = new JFileChooser(); // new File Chooser for saved tab
undoButton = new JButton(" Undo "); //undo Button for game panel
ngButton = new JButton(" New Game ");//new game Button for game panel
redoButton = new JButton(" Redo");//redo Button for game panel
main = new JPanel(new BorderLayout()); //new panel for main game
//main.add(mineGame, BorderLayout.CENTER); //add instance mineGame to main panel
game = new JPanel(new BorderLayout());// new panel for game tab
main.add(game, BorderLayout.CENTER); //add the mineGames panel to game panel
game.add(statusbar, BorderLayout.SOUTH); //add statusbar to bottom of game panel
//game.add(button, BorderLayout.NORTH); // add buttons (eventually be redo, undo, new game)
saved = new JPanel(); // create new panel for the saved tab
saved.add(chooser);//add the File Chooser to the saved tab
String[] levelPicker = {"Easy", "Medium", "Hard"};
levelSelect = new JComboBox(levelPicker);
levelSelect.setSelectedIndex(0);
//levelSelect.addActionListener(this);
buttonPanel = new JPanel();
buttonPanel.add(undoButton);
buttonPanel.add(ngButton);
buttonPanel.add(redoButton);
buttonPanel.add(levelSelect);
main.add(buttonPanel, BorderLayout.NORTH);
//create & add the tabs
tp = new JTabbedPane();
tp.addTab ("Game", main);
tp.addTab ("Saved", saved);
tp.addTab ("Statistics", null);
add(tp);
setPreferredSize(new Dimension(WIDTH, HEIGHT));
setResizable(true);
setVisible(true);
frame.pack();
class listener implements ActionListener{
public void actionPerformed (ActionEvent e)
{
if(e.getSource() == ngButton){
//JOptionPane.showInputDialog(frame, "Do You want To Save");
newMineGame();
}
JComboBox cb = (JComboBox)e.getSource();
String picker = (String)cb.getSelectedItem();
if (picker == "Easy"){
difficulty = 0;
newMineGame();
}
if (picker == "Medium"){
difficulty = 1;
newMineGame();
frame.pack();
}
if (picker == "Hard"){
difficulty = 2;
newMineGame();
frame.pack();
}
}
private void newMineGame() {
game.removeAll();
mineGame = new Board(statusbar, difficulty);
game.add(mineGame, BorderLayout.CENTER);
game.add(statusbar, BorderLayout.SOUTH);
repaint();
}
}
ngButton.addActionListener(new listener());
undoButton.addActionListener(new listener());
redoButton.addActionListener(new listener());
levelSelect.addActionListener(new listener());
}
public static void main(String[] args) {
new SetupFrame();
}
其中一個問題就是難度。 我已經設法做到這一點並且它的工作,但隨着游戲板(在它自己的Jpanel中)變得更大和更小(取決於難度),我無法讓JFrame自動調整大小。
和
在ActionListener事件上嘗試了setSize()和frame.pack()之類的東西,但我似乎無法讓它調整大小。
JFrame.pack()
適用於大小寫
所有代表地雷的JComponents
(有最好的方法可以使用JToggleButton
)將PreferredSize
正確地返回給它的父級( JPanel
)
由GridLayout奠定的父(JPanel)(非常簡單)
JFrame.pack()
有兩種方式,何時,何地
使用CardLayout
, JFrame.pack()
Card
后的下一個代碼行是JFrame.pack()
刪除舊的JPanel
(從JFrame
)並用new替換,然后你需要調用JFrame.(re)validate()
, JFrame.repaint()
和JFrame.pack()
作為最后的代碼行
也許還有另一個問題,重要的是在JFrame.setResizable(false);
設置情況下的代碼排序JFrame.setResizable(false);
編輯后
你錯過了代碼行(不要擴展JFrame
,將此Object創建為Local variable
) JFrame.(re)validate()
, JFrame.repaint()
和JFrame.pack()
作為private void newMineGame() {
最后一行代碼行private void newMineGame() {
但我不明白你的意思是:“你錯過了代碼行(不要擴展JFrame,將此Object創建為Local變量);
代碼可以
import javax.swing.*;
public class SetupFrame {
private JFrame frame;
private JMenuBar menubar = new JMenuBar();
private Board mineGame;
public SetupFrame() {
//there add required JComponents
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setTitle("Minesweeper");
frame.setJMenuBar(menubar);
frame.add(mineGame);
//frame.setPreferredSize(new Dimension(WIDTH, HEIGHT));
//frame.setResizable(true);//not neccessary
frame.pack();
frame.setVisible(true);
}
private void newMineGame() {
//remove old Board
//add a new Board
frame.validate();
frame.repaint();
frame.pack();
}
private static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new SetupFrame();
}
});
}
}
這是你的錯:
frame.pack();
如果您的SetupFrame
實際上是從JFrame
擴展的,為什么還需要frame
? 通過pack()
更改此行,它將起作用。
@mKorbel已經發布了關於pack()
行為的完整且非常有用的解釋(謝謝)。
更新
同樣在你的listener
類中,當按下JButton
時你會得到這個異常:
java.lang.ClassCastException: javax.swing.JButton cannot be cast to javax.swing.JComboBox
你需要做一些改變以避免這種情況:
class listener implements ActionListener{
public void actionPerformed (ActionEvent e) {
if(e.getSource() == ngButton){
//JOptionPane.showInputDialog(frame, "Do You want To Save");
newMineGame();
} else if(e.getSource() instanceof JComboBox){ // add this else-if block
JComboBox cb = (JComboBox)e.getSource();
String picker = (String)cb.getSelectedItem();
if (picker.equals("Easy")){ // <-- picker == "Easy" is not the proper way to compare string, use equals() method instead
difficulty = 0;
newMineGame();
}
if (picker.equals("Medium")){
difficulty = 1;
newMineGame();
//frame.pack(); <--- again, just use pack();
pack();
}
if (picker.equals("Hard")){
difficulty = 2;
newMineGame();
//frame.pack(); <--- again, just use pack();
pack();
}
}
}
或者更好的是,使用ActionListener
實現ItemListener來監聽JComboBox
選擇更改
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