将MouseEvents从一个Java文件链接到另一个Java文件
一些背景我正在开发java游戏，我使用Netbeans来构建它我目前有3个java文件
- App.java
- Board.java
- Piece.java
目前，当它运行时，它向用户显示一个简单的棋盘，其中所有棋子都在正确的位置等。
这一切都在Board.java中完成
我的问题是这些碎片的运动是在Piece.java中完成的，目前我有白色pawn编码和控制它的鼠标事件但是当我运行程序时，棋盘与棋子一起出现，但没有任何棋子移动甚至不是白色的棋子
我很难过为什么，我想也许我没有将它们与董事会或其他类似的东西联系起来，或者也许我的鼠标事件中有你的东西
此外，我的代码运行时没有出现任何错误
以下是java文件
App.java
package chessgame;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import static javax.swing.WindowConstants.DISPOSE_ON_CLOSE;
public class App {
public static void main(String[] args) {
JFrame frame = new Board();
frame.setDefaultCloseOperation(DISPOSE_ON_CLOSE );
frame.pack();
frame.setResizable(true);
frame.setLocationRelativeTo( null );
frame.setVisible(true);
}
}
Board.java
package chessgame;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import static javax.swing.WindowConstants.DISPOSE_ON_CLOSE;
public class Board extends JFrame {
JLayeredPane layeredPane;
JPanel chessBoard;
JLabel chessPiece;
int xAdjustment;
int yAdjustment;
int startX;
int startY;
int initialX;
int initialY;
JPanel panels;
JLabel pieces;
public Board() {
Dimension boardSize = new Dimension(600, 600);
// This is a Layered Pane for this application
layeredPane = new JLayeredPane();
getContentPane().add(layeredPane);
layeredPane.setPreferredSize(boardSize);
//Add a chess board to the Layered Pane
chessBoard = new JPanel();
layeredPane.add(chessBoard, JLayeredPane.DEFAULT_LAYER);
chessBoard.setLayout(new GridLayout(8, 8));
chessBoard.setPreferredSize(boardSize);
chessBoard.setBounds(0, 0, boardSize.width, boardSize.height);
for (int i = 0; i < 64; i++) {
JPanel square = new JPanel(new BorderLayout());
chessBoard.add(square);
int row = (i / 8) % 2;
if (row == 0) {
square.setBackground(i % 2 == 0 ? Color.white : Color.gray);
} else {
square.setBackground(i % 2 == 0 ? Color.gray : Color.white);
}
}
// Setting up the Initial Chess board.
//White Side
for (int i = 8; i < 16; i++) {
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/WhitePawn.png")));
panels = (JPanel) chessBoard.getComponent(i);
panels.add(pieces);
}
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/WhiteRook.png")));
panels = (JPanel) chessBoard.getComponent(0);
panels.add(pieces);
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/WhiteKnight.png")));
panels = (JPanel) chessBoard.getComponent(1);
panels.add(pieces);
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/WhiteKnight.png")));
panels = (JPanel) chessBoard.getComponent(6);
panels.add(pieces);
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/WhiteBishup.png")));
panels = (JPanel) chessBoard.getComponent(2);
panels.add(pieces);
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/WhiteBishup.png")));
panels = (JPanel) chessBoard.getComponent(5);
panels.add(pieces);
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/WhiteKing.png")));
panels = (JPanel) chessBoard.getComponent(3);
panels.add(pieces);
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/WhiteQueen.png")));
panels = (JPanel) chessBoard.getComponent(4);
panels.add(pieces);
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/WhiteRook.png")));
panels = (JPanel) chessBoard.getComponent(7);
panels.add(pieces);
//Black Side
for (int i = 48; i < 56; i++) {
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/BlackPawn.png")));
panels = (JPanel) chessBoard.getComponent(i);
panels.add(pieces);
}
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/BlackRook.png")));
panels = (JPanel) chessBoard.getComponent(56);
panels.add(pieces);
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/BlackKnight.png")));
panels = (JPanel) chessBoard.getComponent(57);
panels.add(pieces);
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/BlackKnight.png")));
panels = (JPanel) chessBoard.getComponent(62);
panels.add(pieces);
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/BlackBishup.png")));
panels = (JPanel) chessBoard.getComponent(58);
panels.add(pieces);
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/BlackBishup.png")));
panels = (JPanel) chessBoard.getComponent(61);
panels.add(pieces);
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/BlackKing.png")));
panels = (JPanel) chessBoard.getComponent(59);
panels.add(pieces);
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/BlackQueen.png")));
panels = (JPanel) chessBoard.getComponent(60);
panels.add(pieces);
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/BlackRook.png")));
panels = (JPanel) chessBoard.getComponent(63);
panels.add(pieces);
}
}
Piece.java
package chessgame;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Piece extends JLabel implements MouseListener, MouseMotionListener {
public Piece(ImageIcon icon) { super(icon); }
JLayeredPane layeredPane;
JPanel chessBoard;
JLabel chessPiece;
int xAdjustment;
int yAdjustment;
int startX;
int startY;
int initialX;
int initialY;
JPanel panels;
JLabel pieces;
/*
This method checks if there is a piece present on a particular square.
*/
private Boolean piecePresent(int x, int y) {
Component c = chessBoard.findComponentAt(x, y);
if (c instanceof JPanel) {
return false;
} else {
return true;
}
}
/*
This is a method to check if a piece is a Black piece.
*/
private Boolean checkWhiteOponent(int newX, int newY) {
Boolean oponent;
Component c1 = chessBoard.findComponentAt(newX, newY);
JLabel awaitingPiece = (JLabel) c1;
String tmp1 = awaitingPiece.getIcon().toString();
if (((tmp1.contains("Black")))) {
oponent = true;
} else {
oponent = false;
}
return oponent;
}
/*
This method is called when we press the Mouse. So we need to find out what piece we have
selected. We may also not have selected a piece!
*/
public void mousePressed(MouseEvent e) {
chessPiece = null;
Component c = chessBoard.findComponentAt(e.getX(), e.getY());
if (c instanceof JPanel) {
return;
}
Point parentLocation = c.getParent().getLocation();
xAdjustment = parentLocation.x - e.getX();
yAdjustment = parentLocation.y - e.getY();
chessPiece = (JLabel) c;
initialX = e.getX();
initialY = e.getY();
startX = (e.getX() / 75);
startY = (e.getY() / 75);
chessPiece.setLocation(e.getX() + xAdjustment, e.getY() + yAdjustment);
chessPiece.setSize(chessPiece.getWidth(), chessPiece.getHeight());
layeredPane.add(chessPiece, JLayeredPane.DRAG_LAYER);
}
public void mouseDragged(MouseEvent me) {
if (chessPiece == null) {
return;
}
chessPiece.setLocation(me.getX() + xAdjustment, me.getY() + yAdjustment);
}
/*
This method is used when the Mouse is released...we need to make sure the move was valid before
putting the piece back on the board.
*/
public void mouseReleased(MouseEvent e) {
if (chessPiece == null) {
return;
}
chessPiece.setVisible(false);
Boolean success = false;
Component c = chessBoard.findComponentAt(e.getX(), e.getY());
String tmp = chessPiece.getIcon().toString();
String pieceName = tmp.substring(0, (tmp.length() - 4));
Boolean validMove = false;
if (pieceName.equals("WhitePawn")) {
if (startY == 1) {
if ((startX == (e.getX() / 75)) && ((((e.getY() / 75) - startY) == 1) || ((e.getY() / 75) - startY) == 2)) {
if ((((e.getY() / 75) - startY) == 2)) {
if ((!piecePresent(e.getX(), (e.getY()))) && (!piecePresent(e.getX(), (e.getY() + 75)))) {
validMove = true;
} else {
validMove = false;
}
} else {
if ((!piecePresent(e.getX(), (e.getY())))) {
validMove = true;
} else {
validMove = false;
}
}
} else {
validMove = false;
}
} else {
int newY = e.getY() / 75;
int newX = e.getX() / 75;
if ((startX - 1 >= 0) || (startX + 1 <= 7)) {
if ((piecePresent(e.getX(), (e.getY()))) && ((((newX == (startX + 1) && (startX + 1 <= 7))) || ((newX == (startX - 1)) && (startX - 1 >= 0))))) {
if (checkWhiteOponent(e.getX(), e.getY())) {
validMove = true;
if (startY == 6) {
success = true;
}
} else {
validMove = false;
}
} else {
if (!piecePresent(e.getX(), (e.getY()))) {
if ((startX == (e.getX() / 75)) && ((e.getY() / 75) - startY) == 1) {
if (startY == 6) {
success = true;
}
validMove = true;
} else {
validMove = false;
}
} else {
validMove = false;
}
}
} else {
validMove = false;
}
}
}
if (!validMove) {
int location = 0;
if (startY == 0) {
location = startX;
} else {
location = (startY * 8) + startX;
}
String pieceLocation = pieceName + ".png";
pieces = new JLabel(new ImageIcon(pieceLocation));
panels = (JPanel) chessBoard.getComponent(location);
panels.add(pieces);
} else {
if (success) {
int location = 56 + (e.getX() / 75);
if (c instanceof JLabel) {
Container parent = c.getParent();
parent.remove(0);
pieces = new JLabel(new ImageIcon("WhiteQueen.png"));
parent = (JPanel) chessBoard.getComponent(location);
parent.add(pieces);
} else {
Container parent = (Container) c;
pieces = new JLabel(new ImageIcon("WhiteQueen.png"));
parent = (JPanel) chessBoard.getComponent(location);
parent.add(pieces);
}
} else {
if (c instanceof JLabel) {
Container parent = c.getParent();
parent.remove(0);
parent.add(chessPiece);
} else {
Container parent = (Container) c;
parent.add(chessPiece);
}
chessPiece.setVisible(true);
}
}
}
public void mouseClicked(MouseEvent e) {
}
public void mouseMoved(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
}
此处还有netbeans
中布局的屏幕截图 
欢迎任何帮助或提示
这是源文件，其中所有内容都写在一个巨大的文件中，可以移动棋子并且白色棋子向右移动，这就是我知道这个棋子编码正确的方式我只能看到链接事件知道他们是分开的
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
/*
This class can be used as a starting point for creating your Chess game project. The only piece that
has been coded is a white pawn...a lot done, more to do!
*/
public class ChessProject extends JFrame implements MouseListener, MouseMotionListener {
JLayeredPane layeredPane;
JPanel chessBoard;
JLabel chessPiece;
int xAdjustment;
int yAdjustment;
int startX;
int startY;
int initialX;
int initialY;
JPanel panels;
JLabel pieces;
public ChessProject(){
Dimension boardSize = new Dimension(600, 600);
// Use a Layered Pane for this application
layeredPane = new JLayeredPane();
getContentPane().add(layeredPane);
layeredPane.setPreferredSize(boardSize);
layeredPane.addMouseListener(this);
layeredPane.addMouseMotionListener(this);
//Add a chess board to the Layered Pane
chessBoard = new JPanel();
layeredPane.add(chessBoard, JLayeredPane.DEFAULT_LAYER);
chessBoard.setLayout( new GridLayout(8, 8) );
chessBoard.setPreferredSize( boardSize );
chessBoard.setBounds(0, 0, boardSize.width, boardSize.height);
for (int i = 0; i < 64; i++) {
JPanel square = new JPanel( new BorderLayout() );
chessBoard.add( square );
int row = (i / 8) % 2;
if (row == 0)
square.setBackground( i % 2 == 0 ? Color.white : Color.gray );
else
square.setBackground( i % 2 == 0 ? Color.gray : Color.white );
}
// Setting up the Initial Chess board.
for(int i=8;i < 16; i++){
pieces = new JLabel( new ImageIcon("WhitePawn.png") );
panels = (JPanel)chessBoard.getComponent(i);
panels.add(pieces);
}
pieces = new JLabel( new ImageIcon("WhiteRook.png") );
panels = (JPanel)chessBoard.getComponent(0);
panels.add(pieces);
pieces = new JLabel( new ImageIcon("WhiteKnight.png") );
panels = (JPanel)chessBoard.getComponent(1);
panels.add(pieces);
pieces = new JLabel( new ImageIcon("WhiteKnight.png") );
panels = (JPanel)chessBoard.getComponent(6);
panels.add(pieces);
pieces = new JLabel( new ImageIcon("WhiteBishup.png") );
panels = (JPanel)chessBoard.getComponent(2);
panels.add(pieces);
pieces = new JLabel( new ImageIcon("WhiteBishup.png") );
panels = (JPanel)chessBoard.getComponent(5);
panels.add(pieces);
pieces = new JLabel( new ImageIcon("WhiteKing.png") );
panels = (JPanel)chessBoard.getComponent(3);
panels.add(pieces);
pieces = new JLabel( new ImageIcon("WhiteQueen.png") );
panels = (JPanel)chessBoard.getComponent(4);
panels.add(pieces);
pieces = new JLabel( new ImageIcon("WhiteRook.png") );
panels = (JPanel)chessBoard.getComponent(7);
panels.add(pieces);
for(int i=48;i < 56; i++){
pieces = new JLabel( new ImageIcon("BlackPawn.png") );
panels = (JPanel)chessBoard.getComponent(i);
panels.add(pieces);
}
pieces = new JLabel( new ImageIcon("BlackRook.png") );
panels = (JPanel)chessBoard.getComponent(56);
panels.add(pieces);
pieces = new JLabel( new ImageIcon("BlackKnight.png") );
panels = (JPanel)chessBoard.getComponent(57);
panels.add(pieces);
pieces = new JLabel( new ImageIcon("BlackKnight.png") );
panels = (JPanel)chessBoard.getComponent(62);
panels.add(pieces);
pieces = new JLabel( new ImageIcon("BlackBishup.png") );
panels = (JPanel)chessBoard.getComponent(58);
panels.add(pieces);
pieces = new JLabel( new ImageIcon("BlackBishup.png") );
panels = (JPanel)chessBoard.getComponent(61);
panels.add(pieces);
pieces = new JLabel( new ImageIcon("BlackKing.png") );
panels = (JPanel)chessBoard.getComponent(59);
panels.add(pieces);
pieces = new JLabel( new ImageIcon("BlackQueen.png") );
panels = (JPanel)chessBoard.getComponent(60);
panels.add(pieces);
pieces = new JLabel( new ImageIcon("BlackRook.png") );
panels = (JPanel)chessBoard.getComponent(63);
panels.add(pieces);
}
/*
This method checks if there is a piece present on a particular square.
*/
private Boolean piecePresent(int x, int y){
Component c = chessBoard.findComponentAt(x, y);
if(c instanceof JPanel){
return false;
}
else{
return true;
}
}
/*
This is a method to check if a piece is a Black piece.
*/
private Boolean checkWhiteOponent(int newX, int newY){
Boolean oponent;
Component c1 = chessBoard.findComponentAt(newX, newY);
JLabel awaitingPiece = (JLabel)c1;
String tmp1 = awaitingPiece.getIcon().toString();
if(((tmp1.contains("Black")))){
oponent = true;
}
else{
oponent = false;
}
return oponent;
}
/*
This method is called when we press the Mouse. So we need to find out what piece we have
selected. We may also not have selected a piece!
*/
public void mousePressed(MouseEvent e){
chessPiece = null;
Component c = chessBoard.findComponentAt(e.getX(), e.getY());
if (c instanceof JPanel)
return;
Point parentLocation = c.getParent().getLocation();
xAdjustment = parentLocation.x - e.getX();
yAdjustment = parentLocation.y - e.getY();
chessPiece = (JLabel)c;
initialX = e.getX();
initialY = e.getY();
startX = (e.getX()/75);
startY = (e.getY()/75);
chessPiece.setLocation(e.getX() + xAdjustment, e.getY() + yAdjustment);
chessPiece.setSize(chessPiece.getWidth(), chessPiece.getHeight());
layeredPane.add(chessPiece, JLayeredPane.DRAG_LAYER);
}
public void mouseDragged(MouseEvent me) {
if (chessPiece == null) return;
chessPiece.setLocation(me.getX() + xAdjustment, me.getY() + yAdjustment);
}
/*
This method is used when the Mouse is released...we need to make sure the move was valid before
putting the piece back on the board.
*/
public void mouseReleased(MouseEvent e) {
if(chessPiece == null) return;
chessPiece.setVisible(false);
Boolean success =false;
Component c = chessBoard.findComponentAt(e.getX(), e.getY());
String tmp = chessPiece.getIcon().toString();
String pieceName = tmp.substring(0, (tmp.length()-4));
Boolean validMove = false;
/*
The only piece that has been enabled to move is a White Pawn...but we should really have this is a separate
method somewhere...how would this work.
So a Pawn is able to move two squares forward one its first go but only one square after that.
The Pawn is the only piece that cannot move backwards in chess...so be careful when committing
a pawn forward. A Pawn is able to take any of the opponent’s pieces but they have to be one
square forward and one square over, i.e. in a diagonal direction from the Pawns original position.
If a Pawn makes it to the top of the other side, the Pawn can turn into any other piece, for
demonstration purposes the Pawn here turns into a Queen.
*/
if(pieceName.equals("WhitePawn")){
if(startY == 1)
{
if((startX == (e.getX()/75))&&((((e.getY()/75)-startY)==1)||((e.getY()/75)-startY)==2))
{
if((((e.getY()/75)-startY)==2)){
if((!piecePresent(e.getX(), (e.getY())))&&(!piecePresent(e.getX(), (e.getY()+75)))){
validMove = true;
}
else{
validMove = false;
}
}
else{
if((!piecePresent(e.getX(), (e.getY()))))
{
validMove = true;
}
else{
validMove = false;
}
}
}
else{
validMove = false;
}
}
else{
int newY = e.getY()/75;
int newX = e.getX()/75;
if((startX-1 >=0)||(startX +1 <=7))
{
if((piecePresent(e.getX(), (e.getY())))&&((((newX == (startX+1)&&(startX+1<=7)))||((newX == (startX-1))&&(startX-1 >=0)))))
{
if(checkWhiteOponent(e.getX(), e.getY())){
validMove = true;
if(startY == 6){
success = true;
}
}
else{
validMove = false;
}
}
else{
if(!piecePresent(e.getX(), (e.getY()))){
if((startX == (e.getX()/75))&&((e.getY()/75)-startY)==1){
if(startY == 6){
success = true;
}
validMove = true;
}
else{
validMove = false;
}
}
else{
validMove = false;
}
}
}
else{
validMove = false;
}
}
}
if(!validMove){
int location=0;
if(startY ==0){
location = startX;
}
else{
location = (startY*8)+startX;
}
String pieceLocation = pieceName+".png";
pieces = new JLabel( new ImageIcon(pieceLocation) );
panels = (JPanel)chessBoard.getComponent(location);
panels.add(pieces);
}
else{
if(success){
int location = 56 + (e.getX()/75);
if (c instanceof JLabel){
Container parent = c.getParent();
parent.remove(0);
pieces = new JLabel( new ImageIcon("WhiteQueen.png") );
parent = (JPanel)chessBoard.getComponent(location);
parent.add(pieces);
}
else{
Container parent = (Container)c;
pieces = new JLabel( new ImageIcon("WhiteQueen.png") );
parent = (JPanel)chessBoard.getComponent(location);
parent.add(pieces);
}
}
else{
if (c instanceof JLabel){
Container parent = c.getParent();
parent.remove(0);
parent.add( chessPiece );
}
else {
Container parent = (Container)c;
parent.add( chessPiece );
}
chessPiece.setVisible(true);
}
}
}
public void mouseClicked(MouseEvent e) {
}
public void mouseMoved(MouseEvent e) {
}
public void mouseEntered(MouseEvent e){
}
public void mouseExited(MouseEvent e) {
}
/*
Main method that gets the ball moving.
*/
public static void main(String[] args) {
JFrame frame = new ChessProject();
frame.setDefaultCloseOperation(DISPOSE_ON_CLOSE );
frame.pack();
frame.setResizable(true);
frame.setLocationRelativeTo( null );
frame.setVisible(true);
}
}
1 个答案:
答案 0 :(得分：1)
你永远不会创建一个Piece的实例，甚至不会创建一次，所以它无法回应任何事件，它甚至不在屏幕上......
我＆＃34;思考＆＃34;你想做更像......的事情。
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/WhiteRook.png")));
...注意，您需要更新Piece以支持使用ImageIcon构建支持
Piece也存在许多问题。你有一堆实例字段......
JLayeredPane layeredPane;
JPanel chessBoard;
JLabel chessPiece;
//...
JPanel panels;
JLabel pieces;
哪些与任何事物（null）无关，这将导致您无法解决问题。
不要将所有管理都集中在UI中，而应考虑尝试使用更多MVC model。游戏逻辑，规则和状态应该在模型中维护，模型根本没有UI逻辑。它基本上允许你拿一块并移动，验证该过程。然后它会通过observer pattern向UI提供通知，这会通知用户界面某些状态已经发生变化......
<强>更新...
更新Piece的构造函数，以便它可以引用Icon并将其传递给它的父级，这样，您就可以继续使用已有的代码了。
public Piece(Icon icon) {
super(icon);
}
接下来，当您创建Piece时，需要为其安装MouseListener。在这种情况下，我很想让董事会负责管理这些部件，它知道布局以及所有部件的位置......
pieces = new Piece(new ImageIcon(getClass().getResource("/chessgame/PieceImages/WhiteRook.png")));
pieces.addMouseListener(this);
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