我对Java Swing库比较新,我试图用一个3乘3的JButton网格编写一个tic tac toe程序。当用户选择一个按钮时,我正在更改包含所选按钮的行和列的背景颜色,以添加突出显示的感觉(通过将每个JButton的button.setBackground()更改为不同的颜色)。
但是,当鼠标拖过其中一个突出显示的按钮时,我目前遇到了删除新背景颜色(并更改回旧背景颜色)的问题。
当鼠标进入按钮时,似乎有一个鼠标事件正在重新绘制按钮,但是我已经尝试过但未能关闭此事件。
我非常感谢任何帮助!如果我需要澄清任何事情,请告诉我。感谢
答案 0 :(得分:2)
如果要将按钮更改为默认值,请将背景设置为NULL
:
button.setBackground(inBounds ? new Color(0xFFFF00) : null);
这是我掀起的一个例子。您可以将其用作参考。
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JButton;
import javax.swing.JFrame;
public class GridRollOver extends JFrame implements MouseListener {
private static final long serialVersionUID = -7134685459910610342L;
public JButton[] buttons = new JButton[9];
public GridRollOver() {
this.setLayout(new GridLayout(3, 3));
for (int i = 0; i < 9; i++) {
JButton b = new JButton();
b.setRolloverEnabled(true);
b.addMouseListener(this);
this.add(b);
buttons[i] = b;
}
this.setVisible(true);
this.setSize(500, 500);
this.setLocationRelativeTo(null);
}
public static void main(String[] args) {
new GridRollOver();
}
public void highlightButtons(Point cursor) {
for (int i = 0; i < buttons.length; i++) {
JButton button = buttons[i];
Point buttonLocation = button.getLocationOnScreen();
double west = buttonLocation.getX();
double east = buttonLocation.getX() + button.getWidth();
double north = buttonLocation.getY();
double south = buttonLocation.getY() + button.getHeight();
boolean inRow = cursor.getX() > west && cursor.getX() < east;
boolean inCol = cursor.getY() > north && cursor.getY() < south;
boolean inBounds = inRow || inCol;
button.setBackground(inBounds ? new Color(0xFFFF00) : null);
}
}
@Override
public void mouseEntered(MouseEvent event) {
highlightButtons(event.getLocationOnScreen());
}
@Override
public void mouseExited(MouseEvent e) { }
@Override
public void mouseClicked(MouseEvent e) { }
@Override
public void mousePressed(MouseEvent e) { }
@Override
public void mouseReleased(MouseEvent e) { }
}
答案 1 :(得分:0)
当鼠标退出时鼠标在按钮上输入时,您可以更改按钮的颜色,使用MouseListener
方法mouseEntered(MouseEvent e)
和mouseExited(MouseEvent e)
将其更改为默认颜色。
package listener;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
/**
* This class is used to show when mouse arrow on the button its color change when exited it again on it same color
* @author Ganesh Patel
*
*/
public class ButtonColorChanger implements MouseListener{
JFrame frame;
JButton buttonArray[];
JPanel contentPane;
public ButtonColorChanger() {
JFrame.setDefaultLookAndFeelDecorated(true);
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
contentPane = createContentPane();
frame.setContentPane(contentPane);
frame.setVisible(true);
frame.pack();
}
/**
* This method is used to create content pane and add 9 button and call the MouseListener on every button
* @return panel content pane of the frame
*/
public JPanel createContentPane() {
JPanel panel = new JPanel(new GridLayout(3,3));
buttonArray = new JButton[9];
//add 9 button on the panel and call MouseListener on every button
for(int i = 0; i<buttonArray.length; i++) {
buttonArray[i] = new JButton(" O ");
buttonArray[i].addMouseListener(this);
panel.add(buttonArray[i]);
}
return panel;
}
@Override
public void mouseClicked(MouseEvent e) {
}
/**
*This method is used for change the color of button when mouse on it.
*/
@Override
public void mouseEntered(MouseEvent e) {
JButton button = (JButton)e.getSource();
button.setBackground(Color.RED);
}
/**
* This method is used to change the color of button when mouse is not on it.
*/
@Override
public void mouseExited(MouseEvent e) {
JButton button = (JButton)e.getSource();
button.setBackground(null);
}
@Override
public void mousePressed(MouseEvent e) {
}
@Override
public void mouseReleased(MouseEvent e) {
}
public static void main(String args[]) {
new ButtonColorChanger();
}
}