布局似乎有问题,JButton在调整窗口大小时显示意外行为
JRE 版本 1.7 更新 3
预期行为
当我运行程序时,它按预期工作,一切都很顺利。就像我点击动画停止和文本上的相同更改为.现在,当我点击时,颜色的变化,以及 的颜色,也会发生变化,到.如果我按原样运行应用程序而不调整大小,则整个行为有效。STOP
JButton
JButton
START
BALL COLOUR
JButton
BALL
BALL COLOUR
JBUTTON
BALL
意外行为
但是,当我通过拉动时,就会显示我的应用程序的意外行为,从某种意义上说,如果我按下然后单击按钮,则先前单击的文本更改为的文本将更改为再次更改为不应该更改时,以及颜色将保持不变或将变为, 当它应该改变为球的颜色。我正在附上图片以获取更多信息。但是,如果您尝试将其大小调整回原始大小或更接近原始大小,那么事情将恢复正常。为什么会发生这种情况?任何想法或线索将不胜感激。RESIZE
JFrame
Right Side
STOP
JButton
BALL COLOUR
JButton
START
STOP
BALL COLOUR
JButton
BLUE
由于我的应用程序以预期行为运行,如上所述:
在这里,意想不到的行为
底线 :
为什么应用程序像往常一样运行,在,但不是通过拖动它时,但是再次,如果你把它带到它的原始大小或更接近它,事情恢复正常,它按预期工作?BEGINNING
RESIZED
RIGHT SIDE
因此,考虑到这种情况,我是否在程序中做错了什么。或者这正是我应该使用的情况,或者这是一个问题与,或者隐藏的东西有关。请放一些光:-)SwingWorker
Layout
Content Pane
这是我正在使用的代码,我已经将其降低到最低限度,因为我认为要证明我的问题:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
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 int colourCounter;
Color[] colours = {
Color.BLUE.darker(),
Color.MAGENTA.darker(),
Color.BLACK.darker(),
Color.RED.darker(),
Color.PINK.darker(),
Color.CYAN.darker(),
Color.DARK_GRAY.darker(),
Color.YELLOW.darker(),
Color.GREEN.darker()
};
private Color backgroundColour;
private Color foregroundColour;
private ActionListener timerAction = new ActionListener()
{
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;
private ComponentAdapter componentAdapter = new ComponentAdapter()
{
public void componentResized(ComponentEvent ce)
{
timer.restart();
startStopButton.setText("STOP");
isTimerRunning = true;
}
};
public BallAnimation()
{
x = y = 0;
positiveX = positiveY = true;
speedValue = 1;
colourCounter = 0;
isTimerRunning = false;
diameter = 50;
backgroundColour = Color.WHITE.brighter();
foregroundColour = colours[colourCounter];
timer = new Timer(10, timerAction);
}
private void createAndDisplayGUI()
{
JFrame frame = new JFrame("Ball Animation");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationByPlatform(true);
drawingArea = new DrawingArea(x, y
, backgroundColour, foregroundColour, diameter);
drawingArea.addComponentListener(componentAdapter);
frame.add(makeButtonPanel(), BorderLayout.LINE_END);
frame.add(drawingArea, BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
}
private JPanel makeButtonPanel()
{
buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(0, 1));
buttonPanel.setBorder(BorderFactory.createLineBorder(
Color.DARK_GRAY, 5, true));
startStopButton = new JButton("START");
startStopButton.setBackground(Color.GREEN.darker());
startStopButton.setForeground(Color.WHITE.brighter());
startStopButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
System.out.println("START/STOP JButton Clicked!");
if (!isTimerRunning)
{
startStopButton.setText("STOP");
timer.start();
isTimerRunning = true;
buttonPanel.revalidate();
buttonPanel.repaint();
}
else if (isTimerRunning)
{
startStopButton.setText("START");
timer.stop();
isTimerRunning = false;
buttonPanel.revalidate();
buttonPanel.repaint();
}
}
});
startStopButton.setBorder(BorderFactory.createLineBorder(
Color.WHITE, 4, true));
buttonPanel.add(startStopButton);
colourButton = new JButton("BALL COLOUR");
colourButton.setBackground(colours[colourCounter]);
colourButton.setForeground(Color.WHITE);
colourButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
System.out.println("COLOUR JButton Clicked!");
//timer.restart();
colourCounter++;
if (colourCounter == 9)
colourCounter = 0;
foregroundColour = colours[colourCounter];
drawingArea.setXYColourValues(x, y, backgroundColour
, foregroundColour);
//drawingArea.setForegroundForBall(foregroundColour);
colourButton.setBackground(foregroundColour);
colourButton.revalidate();
colourButton.repaint();
//timer.start();
}
});
colourButton.setBorder(BorderFactory.createLineBorder(
Color.WHITE, 2, true));
buttonPanel.add(colourButton);
exitButton = new JButton("EXIT");
exitButton.setBackground(Color.RED.darker());
exitButton.setForeground(Color.WHITE.brighter());
exitButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
System.out.println("EXIT JButton Clicked!");
timer.stop();
System.exit(0);
}
});
exitButton.setBorder(BorderFactory.createLineBorder(
Color.RED.darker().darker(), 4, true));
buttonPanel.add(exitButton);
return buttonPanel;
}
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)
{
Runnable runnable = new Runnable()
{
public void run()
{
new BallAnimation().createAndDisplayGUI();
}
};
SwingUtilities.invokeLater(runnable);
}
}
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.darker(), 5, true));
}
public void setXYColourValues(int x, int y
, Color bColor, Color fColor)
{
this.x = x;
this.y = y;
backgroundColor = bColor;
foregroundColor = fColor;
repaint();
}
public Dimension getPreferredSize()
{
return (new Dimension(500, 400));
}
public void paintComponent(Graphics g)
{
g.setColor(backgroundColor);
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(foregroundColor);
g.fillOval(x, y, ballDiameter, ballDiameter);
}
}
**最新编辑 : **