Java 如何在JButton矩阵中生成事件?
我正在尝试创建一个Java 如何在JButton矩阵中生成事件?,java,arrays,swing,jbutton,mouselistener,Java,Arrays,Swing,Jbutton,Mouselistener,我正在尝试创建一个鼠标侦听器。当我将鼠标悬停在JButton上时,我希望它更改其背景色以及数组中的下一个JButtons。例如,当我悬停在JButton[0][0]上时,它会更改JButton[0][0]、JButton[1][0]、JButton[2][0]等的背景 下面是如何创建JButton数组: for (int i = 0; i < 10; i++) { for (int j = 0; j < 10; j++) { btn[i][j] = new J
鼠标侦听器
。当我将鼠标悬停在JButton
上时,我希望它更改其背景色以及数组中的下一个JButton
s。例如,当我悬停在JButton[0][0]
上时,它会更改JButton[0][0]
、JButton[1][0]
、JButton[2][0]
等的背景
下面是如何创建JButton
数组:
for (int i = 0; i < 10; i++) {
for (int j = 0; j < 10; j++) {
btn[i][j] = new JButton();
btn[i][j].addMouseListener(this);
btn[i][j].setBackground(Color.black);
panel.add(btn[i][j]);
}
}
我试过做btn[I+1][j].setBackground(Color.black)代码>并设置为蓝色[1][0]
,[2][0]
。。。但不是[i+1][j]
运行程序时没有错误
上图显示了我正在尝试做的事情。不需要引用数组——只需更改按钮的状态,按钮将通过getSource()
返回。e、 g
@Override
public void mouseEntered(MouseEvent me) {
JButton event = (JButton) me.getSource();
event.setBackground(Color.blue);
}
同样地,对于鼠标退出
如果需要知道特定鼠标的i和j,则使用嵌套for循环遍历数组
int i = 0;
int j = 0;
for (int i2 = 0; i2 < btn.length; i2++) {
for (int j2 = 0; j2 < btn[i2].length; j2++) {
if (event == btn[i2][j2]) {
i = i2;
j = j2;
}
}
}
// i and j set to appropriate value
inti=0;
int j=0;
for(int i2=0;i2
或者获取并设置按钮的客户端属性,类似于之前所做的。如果您需要更详细的帮助,请创建并发布一个有效的您正在寻找的方法称为Component.dispatchEvent(AWTEvent e)
,我为此提供了一个一维示例:
package scratch.pad.ui;
import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.*;
import java.util.List;
/**
* Propagate event to neighbor buttons
*/
public class EventPropagation extends JFrame {
private List<JButton> buttons = new ArrayList<>();
private class MouseEventPropagationListener extends MouseAdapter {
// The event source, for controlling the propagation of the event.
// To prevent infinite loop, we only dispatch the event to targets when
// e.getSource() == this.source;
private JButton source;
// Targets to propagate the event.
private java.util.List<JButton> targets;
public MouseEventPropagationListener(JButton source, JButton ... targets) {
this.source = source;
this.targets = Arrays.asList(targets);
}
@Override
public void mouseEntered(MouseEvent e) {
super.mouseEntered(e);
// Use this.source because e.getSource() could be different.
this.source.setBackground(Color.WHITE);
dispatchEvent(e);
}
@Override
public void mouseExited(MouseEvent e) {
super.mouseExited(e);
this.source.setBackground(Color.BLACK);
dispatchEvent(e);
}
private void dispatchEvent(MouseEvent e) {
if (e.getSource() == source) {
for (JButton target : targets) {
target.dispatchEvent(e);
}
}
}
}
public EventPropagation() throws HeadlessException {
final int n = 10;
this.setTitle("Event propagation test");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.getContentPane().setLayout(new FlowLayout());
this.setSize(300, 300);
this.setResizable(false);
// Create the buttons
for (int i = 0; i < n; i++) {
JButton btn = new JButton("Button " + i);
btn.setBackground(Color.BLACK);
this.buttons.add(btn);
this.getContentPane().add(btn);
}
// Setup propagation:
for (int i = 0; i < n; i++) {
JButton btn = this.buttons.get(i);
MouseEventPropagationListener listener = new MouseEventPropagationListener(btn, getNeighbors(i));
btn.addMouseListener(listener);
}
}
private JButton [] getNeighbors(int i) {
List<JButton> neighbors = new ArrayList<>();
if (i > 0) neighbors.add(this.buttons.get(i-1));
if (i < this.buttons.size() - 1) neighbors.add(this.buttons.get(i + 1));
return neighbors.toArray(new JButton[0]);
}
public static void main(String [] args) {
EventPropagation ep = new EventPropagation();
ep.setVisible(true);
}
}
package scratch.pad.ui;
导入javax.swing.*;
导入java.awt.*;
导入java.awt.event.MouseAdapter;
导入java.awt.event.MouseEvent;
导入java.util.*;
导入java.util.List;
/**
*将事件传播到邻居按钮
*/
公共类EventPropagation扩展了JFrame{
私有列表按钮=新建ArrayList();
私有类MouseEventPropagationListener扩展了MouseAdapter{
//事件源,用于控制事件的传播。
//为了防止无限循环,我们只在
//e.getSource()==此.source;
私有JButton源;
//传播事件的目标。
私有java.util.List目标;
公共MouseEventPropagationListener(JButton源、JButton…目标){
this.source=源;
this.targets=Arrays.asList(目标);
}
@凌驾
公共无效鼠标事件(鼠标事件e){
超级鼠标(e);
//使用this.source,因为e.getSource()可能不同。
此.源.背景(颜色.白色);
调度事件(e);
}
@凌驾
公共无效mouseExited(MouseEvent e){
超级鼠标退出(e);
这个.源.背景(颜色.黑色);
调度事件(e);
}
私有无效调度事件(MouseEvent e){
如果(例如getSource()==源){
for(JButton目标:目标){
目标。调度事件(e);
}
}
}
}
public EventPropagation()抛出HeadlessException{
最终整数n=10;
本文件为setTitle(“事件传播测试”);
此.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
这个.getContentPane().setLayout(新的FlowLayout());
这个。设置大小(300300);
此参数为.setresizeable(false);
//创建按钮
对于(int i=0;i0)个邻居。添加(this.buttons.get(i-1));
如果(i
什么不起作用?您的帖子中是否有任何错误消息或堆栈跟踪?只需使用“事件”对象并更改其状态即可。您甚至不需要(错误地)深入研究数组。为每个按钮分配一个ActionListener,不要共享同一个按钮。@serg.nechaev:不需要这样做——您可以从getSource()
中获取按下的按钮,他所要做的就是设置该按钮的状态。如果他需要知道i和j值,那么他应该使用一对嵌套for循环来遍历数组,以查看哪个数组项与源匹配。我们可以让他看看,如果他能改进他的问题。。。。啊,好吧。如果你仍然需要帮助,发布一个有效的@alberto,没有必要使用dispatchEvent(…)
方法,你只需要设置按钮的背景。也就是说,您可以用target.setBackground(source.getBackground())替换dispatchEvent()语句代码>。您甚至可以在循环之外去掉“if语句”。原始代码的问题在于,您没有确定悬停按钮的逻辑。一旦你认识了邻居,你就可以设置背景。
package scratch.pad.ui;
import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.*;
import java.util.List;
/**
* Propagate event to neighbor buttons
*/
public class EventPropagation extends JFrame {
private List<JButton> buttons = new ArrayList<>();
private class MouseEventPropagationListener extends MouseAdapter {
// The event source, for controlling the propagation of the event.
// To prevent infinite loop, we only dispatch the event to targets when
// e.getSource() == this.source;
private JButton source;
// Targets to propagate the event.
private java.util.List<JButton> targets;
public MouseEventPropagationListener(JButton source, JButton ... targets) {
this.source = source;
this.targets = Arrays.asList(targets);
}
@Override
public void mouseEntered(MouseEvent e) {
super.mouseEntered(e);
// Use this.source because e.getSource() could be different.
this.source.setBackground(Color.WHITE);
dispatchEvent(e);
}
@Override
public void mouseExited(MouseEvent e) {
super.mouseExited(e);
this.source.setBackground(Color.BLACK);
dispatchEvent(e);
}
private void dispatchEvent(MouseEvent e) {
if (e.getSource() == source) {
for (JButton target : targets) {
target.dispatchEvent(e);
}
}
}
}
public EventPropagation() throws HeadlessException {
final int n = 10;
this.setTitle("Event propagation test");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.getContentPane().setLayout(new FlowLayout());
this.setSize(300, 300);
this.setResizable(false);
// Create the buttons
for (int i = 0; i < n; i++) {
JButton btn = new JButton("Button " + i);
btn.setBackground(Color.BLACK);
this.buttons.add(btn);
this.getContentPane().add(btn);
}
// Setup propagation:
for (int i = 0; i < n; i++) {
JButton btn = this.buttons.get(i);
MouseEventPropagationListener listener = new MouseEventPropagationListener(btn, getNeighbors(i));
btn.addMouseListener(listener);
}
}
private JButton [] getNeighbors(int i) {
List<JButton> neighbors = new ArrayList<>();
if (i > 0) neighbors.add(this.buttons.get(i-1));
if (i < this.buttons.size() - 1) neighbors.add(this.buttons.get(i + 1));
return neighbors.toArray(new JButton[0]);
}
public static void main(String [] args) {
EventPropagation ep = new EventPropagation();
ep.setVisible(true);
}
}