所描述的問題涉及Java 應用程式圖形使用者介面(GUI) 的意外行為當調整視窗大小時。調整視窗大小會導致某些 JButton 元件的行為發生變化，包括按鈕的文字和顏色。
要理解問題，必須檢查程式碼並了解識別視窗大小和 JButton 元件行為之間的任何依賴關係。問題可能在於元件的佈局方式或其屬性的管理方式。
提供的程式碼使用 ComponentAdapter 來偵測元件大小的變化繪圖區域元件。當尺寸改變時，會觸發以下操作：
這些操作無疑是為了確保計時器啟動當調整視窗大小時。但是，該程式碼不處理其他元件（例如 JButton 元件）的大小調整。
意外行為可能是由 JButton 組件的佈局方式引起的以及他們的財產是如何管理的。調整視窗大小時，佈局管理器可能會重新排列元件，這可能會影響它們的屬性。例如，按鈕上的文字可能會被截斷或顏色可能會改變。
要解決此問題，請考慮以下建議：
這是一個範例實現，使用 GridBagLayout 來管理佈局並確保 JButton 元件保留其所需的屬性：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class BallAnimation {
private int x;
private int y;
private boolean positiveX;
private boolean positiveY;
private boolean isTimerRunning;
private int speedValue;
private int diameter;
private DrawingArea drawingArea;
private Timer timer;
private Queue<Color> clut = new LinkedList<>(Arrays.asList(
Color.BLUE.darker(),
Color.MAGENTA.darker(),
Color.BLACK,
Color.RED.darker(),
Color.PINK,
Color.CYAN.darker(),
Color.DARK_GRAY,
Color.YELLOW.darker(),
Color.GREEN.darker()));
private Color backgroundColour;
private Color foregroundColour;
private ActionListener timerAction = new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
x = getX();
y = getY();
drawingArea.setXYColourValues(x, y, backgroundColour, foregroundColour);
}
};
private JPanel buttonPanel;
private JButton startStopButton;
private JButton speedIncButton;
private JButton speedDecButton;
private JButton resetButton;
private JButton colourButton;
private JButton exitButton;
public BallAnimation() {
x = y = 0;
positiveX = positiveY = true;
speedValue = 1;
isTimerRunning = false;
diameter = 50;
backgroundColour = Color.white;
foregroundColour = clut.peek();
timer = new Timer(10, timerAction);
}
private void createAndDisplayGUI() {
JFrame frame = new JFrame("Ball Animation");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
drawingArea = new DrawingArea(x, y, backgroundColour, foregroundColour, diameter);
drawingArea.addComponentListener(new ComponentAdapter() {
@Override
public void componentResized(ComponentEvent ce) {
timer.restart();
startStopButton.setText("Stop");
isTimerRunning = true;
}
});
JPanel contentPane = frame.getContentPane();
contentPane.setLayout(new BorderLayout());
contentPane.add(makeButtonPanel(), BorderLayout.EAST);
contentPane.add(drawingArea, BorderLayout.CENTER);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
private JPanel makeButtonPanel() {
buttonPanel = new JPanel(new GridBagLayout());
buttonPanel.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 5));
GridBagConstraints gbc = new GridBagConstraints();
gbc.fill = GridBagConstraints.BOTH;
startStopButton = makeButton("Start", gbc, 0, 0);
colourButton = makeButton("Change Color", gbc, 0, 1);
exitButton = makeButton("Exit", gbc, 0, 2);
return buttonPanel;
}
private JButton makeButton(String text, GridBagConstraints gbc, int row, int column) {
JButton button = new JButton(text);
button.setOpaque(true);
button.setForeground(Color.WHITE);
button.setBackground(Color.GREEN.DARKER);
button.setBorder(BorderFactory.createLineBorder(Color.GRAY, 4));
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
if (button == startStopButton) {
if (!isTimerRunning) {
startStopButton.setText("Stop");
timer.start();
isTimerRunning = true;
} else {
startStopButton.setText("Start");
timer.stop();
isTimerRunning = false;
}
} else if (button == colourButton) {
clut.add(clut.remove());
foregroundColour = clut.peek();
drawingArea.setXYColourValues(x, y, backgroundColour, foregroundColour);
colourButton.setBackground(foregroundColour);
} else if (button == exitButton) {
timer.stop();
System.exit(0);
}
}
});
gbc.gridx = column;
gbc.gridy = row;
buttonPanel.add(button, gbc);
return button;
}
private int getX() {
if (x < 0) {
positiveX = true;
} else if (x >= drawingArea.getWidth() - diameter) {
positiveX = false;
}
return calculateX();
}
private int calculateX() {
if (positiveX) {
return (x += speedValue);
} else {
return (x -= speedValue);
}
}
private int getY() {
if (y < 0) {
positiveY = true;
} else if (y >= drawingArea.getHeight() - diameter) {
positiveY = false;
}
return calculateY();
}
private int calculateY() {
if (positiveY) {
return (y += speedValue);
} else {
return (y -= speedValue);
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> new BallAnimation().createAndDisplayGUI());
}
}
class DrawingArea extends JComponent {
private int x;
private int y;
private int ballDiameter;
private Color backgroundColor;
private Color foregroundColor;
public DrawingArea(int x, int y, Color bColor, Color fColor, int dia) {
this.x = x;
this.y = y;
ballDiameter = dia;
backgroundColor = bColor;
foregroundColor = fColor;
setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 5));
}
public void setXYColourValues(int x, int y, Color bColor, Color fColor) {
this.x = x;
this.y = y;
backgroundColor = bColor;
foregroundColor = fColor;
repaint();
}
@Override
public Dimension getPreferredSize() {
return new Dimension(500, 400);
}
@Override
public void paintComponent(Graphics g) {以上是當我調整 Java 視窗大小時，為什麼我的 JButton 表現異常？的詳細內容。更多資訊請關注PHP中文網其他相關文章！
