Thread: MouseReleased event not being called

Hi,

i am trying to make a chess game and in order to do that I'm using a drag and drop method to move the characters.

I have been able to implement a mouse adapter to drag and drop the images. I am now trying to add a mouseReleased function where i can then check if the player has made a valid move.

When i run the program i am able to get the mousePressed function to work but the mouseReleased function is only called sometimes on a quick click and never after a drag.

button.addMouseListener(new MouseAdapter(){ //function that drags and drops the icons
    @Override
    public void mousePressed(MouseEvent e){
        JButtonExt previousSquare = (JButtonExt)e.getSource();
        TransferHandler handle = previousSquare.getTransferHandler();
        handle.exportAsDrag(previousSquare, e, TransferHandler.COPY);
        System.out.println(previousSquare.location[0] + " " + previousSquare.location[1]);
    }
    @Override
    public void mouseReleased(MouseEvent e) {
        System.out.println("test");
    }
});

any help would be appreciated

@aussiemcgr the button is an extension of JButton where i have added a couple of extra properties that i can use in other parts of the game. I am dragging the image from one button and then dropping it on another one.

@norm the problem is that i can't get the program to print "test" after dragging the image from one button and onto another. but it will output "test" when i just click a single button and release it.

after testing another program i think the new button isn't gaining focus and so the mouseReleased isn't being called. Is there a simple way of allowing the new button to gain the focus? maybe using something like mouseEntered?

what exactly do you want in the test program? would you like me to upload the whole package?

sorry for the late reply

 
import javax.swing.*;
import java.util.ArrayList;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;
 
 
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
/**
 *
 * @author Mitch
 */
 
enum PieceType {PAWN, ROOK, KNIGHT, BISHOP, QUEEN, KING};
 
enum PieceColour {BLANK, BLACK, WHITE};
public class ChessBoard extends JFrame {
 
 
 
 
    private Container c;
    private JButtonExt[][] chessBoard = new JButtonExt[8][8];
    private Piece[][] players = new Piece[2][16];
    private Piece player;
 
    public static void main(String[] args) {
        ChessBoard window = new ChessBoard();
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        window.setVisible(true);
    }
 
    class buttonClick implements ActionListener {    // Listen class to launch function for close menu item
        @Override
        public void actionPerformed(ActionEvent e) {
            //System.out.println("click");
        }
    }
 
    public ChessBoard() {
 
        c = getContentPane();
 
        //create buttons for the game board
        //buttons will be able to drag and drop images
        for (int x=0; x<8; x++) {
            for (int y=0; y<8; y++) {
                int g = x+y;
                JButtonExt label;
 
                if (g%2==0) {//white squares
                    label = new JButtonExt(PieceColour.WHITE, new int[]{x,y});
                }
                else {//black square
                    label = new JButtonExt(PieceColour.BLACK, new int[]{x,y});
                }
 
 
 
 
                //System.out.println(label.getIcon());
 
                TransferHandler transfer = new TransferHandler("icon");
 
 
                if (g % 2 == 0) { //white square
                    label.setFont(new java.awt.Font("Dialog", Font.BOLD, 14));
                }
                else { //black squares
 
                }
 
                //set the location and size of each button depending on where they are located on the board
                label.setLocation((y*60)+60, (x*60)+60);
                label.setSize(60, 60);
 
 
                label.addActionListener(new ChessBoard.buttonClick()); //allow the user to click on a square and show available moves
                label.setTransferHandler(transfer); //allow the button to accept drag and drop functions
                label.addMouseListener(new MouseAdapter(){ //function that drags and drops the icons
                    @Override
                    public void mousePressed(MouseEvent e){
                        JButtonExt previousSquare = (JButtonExt)e.getSource();
                        TransferHandler handle = previousSquare.getTransferHandler();
                        handle.exportAsDrag(previousSquare, e, TransferHandler.COPY);
                        System.out.println(previousSquare.location[0] + " " + previousSquare.location[1]);
 
 
                    }
                    @Override
                    public void mouseReleased(MouseEvent e) {
                        System.out.println("test");
                    }
                });
 
 
                chessBoard[x][y] = label;
            }
        }
 
        for(JButtonExt a[] : chessBoard) {
            for (JButtonExt button: a) {
                int x = button.location[0];
                int y = button.location[1];
 
                String col;
                if (button.defaultColour == PieceColour.BLACK) {
                    col = "Dark";
                } else {
                    col = "Light";
                }
 
                if (x == 1) {
                    ImageIcon icon = new ImageIcon("images/whitePawn" + col + ".jpg");
                    button.setIcon(icon);
 
                }
                else if (x == 6) {
                    ImageIcon icon = new ImageIcon("images/blackPawn" + col + ".jpg");
                    button.setIcon(icon);
                }
                else if (x == 0) {
                    if (y == 0 || y == 7) {
                        ImageIcon icon = new ImageIcon("images/whiteRook" + col + ".jpg");
                        button.setIcon(icon);
                    }
                    else if (y == 1 || y == 6) {
                        ImageIcon icon = new ImageIcon("images/whiteBishop" + col + ".jpg");
                        button.setIcon(icon);
                    }
                    else if (y == 2 || y == 5) {
                        ImageIcon icon = new ImageIcon("images/whiteKnight" + col + ".jpg");
                        button.setIcon(icon);
                    }
                    else if (y == 3) {
                        ImageIcon icon = new ImageIcon("images/whiteQueen" + col + ".jpg");
                        button.setIcon(icon);
                    }
                    else {
                        ImageIcon icon = new ImageIcon("images/whiteKing" + col + ".jpg");
                        button.setIcon(icon);
                    }
                }
                else if (x == 7) {
                 if (y == 0 || y == 7) {
                        ImageIcon icon = new ImageIcon("images/blackRook" + col + ".jpg");
                        button.setIcon(icon);
                    }
                    else if (y == 1 || y == 6) {
                        ImageIcon icon = new ImageIcon("images/blackBishop" + col + ".jpg");
                        button.setIcon(icon);
                    }
                    else if (y == 2 || y == 5) {
                        ImageIcon icon = new ImageIcon("images/blackKnight" + col + ".jpg");
                        button.setIcon(icon);
                    }
                    else if (y == 3) {
                        ImageIcon icon = new ImageIcon("images/blackQueen" + col + ".jpg");
                        button.setIcon(icon);
                    }
                    else {
                        ImageIcon icon = new ImageIcon("images/blackKing" + col + ".jpg");
                        button.setIcon(icon);
                    }
                }
                else {
                    ImageIcon icon = new ImageIcon("images/"+ col + ".jpg");
                    button.setIcon(icon);
                }
                c.add(button);
            }
        }
 
        JLabel label = new JLabel("");
        c.add(label);
 
        /*for (int h=0; h<2;h++) {
            for (int i=0;i<9;i++) {
                if (h==1) {
                    players[h][i] = new Piece(PieceType.PAWN, PieceColour.WHITE, {h,i}, "whitePawn");
                }
            }
 
        }*/
 
        this.setTitle("Chess");
        this.setContentPane(c);
        this.setBounds(0, 0, 650, 650);
        this.setLocationRelativeTo(null);
    }
}

this code should compile

the program should show the location of the square you clicked on, in the command line, and then the location of the square you released the mouse on. However the last part isn't working as i want it to.

 
 
import javax.swing.*;
import java.util.ArrayList;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;
 
 
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
/**
 *
 * @author Mitch
 */
 
 
import javax.swing.*;
import java.awt.event.*;
 
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
/**
 *
 * @author Mitch
 */
 
 
class JButtonExt extends JButton {
    PieceColour holdsColour;
    PieceColour defaultColour;
    int[] location;
 
    public JButtonExt(PieceColour newColour, int[] newLocation) {
        this.location = newLocation;
        this.defaultColour = newColour;
        this.holdsColour = null;
    }
}
 
enum PieceType {PAWN, ROOK, KNIGHT, BISHOP, QUEEN, KING};
 
enum PieceColour {BLANK, BLACK, WHITE};
class ChessBoard extends JFrame {
 
 
 
 
    private Container c;
    private JButtonExt[][] chessBoard = new JButtonExt[8][8];
 
    public static void main(String[] args) {
        ChessBoard window = new ChessBoard();
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        window.setVisible(true);
    }
 
    class buttonClick implements ActionListener {    // Listen class to launch function for close menu item
        @Override
        public void actionPerformed(ActionEvent e) {
            //System.out.println("click");
        }
    }
 
    public ChessBoard() {
 
        c = getContentPane();
 
        //create buttons for the game board
        //buttons will be able to drag and drop images
        for (int x=0; x<8; x++) {
            for (int y=0; y<8; y++) {
                int g = x+y;
                JButtonExt label;
 
                if (g%2==0) {//white squares
                    label = new JButtonExt(PieceColour.WHITE, new int[]{x,y});
                }
                else {//black square
                    label = new JButtonExt(PieceColour.BLACK, new int[]{x,y});
                }
 
 
 
 
                //System.out.println(label.getIcon());
 
                TransferHandler transfer = new TransferHandler("icon");
 
 
                if (g % 2 == 0) { //white square
                    label.setFont(new java.awt.Font("Dialog", Font.BOLD, 14));
                }
                else { //black squares
 
                }
 
                //set the location and size of each button depending on where they are located on the board
                label.setLocation((y*60)+60, (x*60)+60);
                label.setSize(60, 60);
 
 
                label.addActionListener(new ChessBoard.buttonClick()); //allow the user to click on a square and show available moves
                label.setTransferHandler(transfer); //allow the button to accept drag and drop functions
                label.addMouseListener(new MouseAdapter(){ //function that drags and drops the icons
                    @Override
                    public void mousePressed(MouseEvent e){
                        JButtonExt previousSquare = (JButtonExt)e.getSource();
                        TransferHandler handle = previousSquare.getTransferHandler();
                        handle.exportAsDrag(previousSquare, e, TransferHandler.COPY);
                        System.out.println(previousSquare.location[0] + " " + previousSquare.location[1]);
 
 
                    }
                    @Override
                    public void mouseReleased(MouseEvent e) {
                        System.out.println("test");
                    }
                });
 
 
                chessBoard[x][y] = label;
            }
        }
 
        for(JButtonExt a[] : chessBoard) {
            for (JButtonExt button: a) {
                int x = button.location[0];
                int y = button.location[1];
 
                String col;
                if (button.defaultColour == PieceColour.BLACK) {
                    col = "Dark";
                } else {
                    col = "Light";
                }
 
                if (x == 1) {
                    ImageIcon icon = new ImageIcon("images/whitePawn" + col + ".jpg");
                    button.setIcon(icon);
 
                }
                else if (x == 6) {
                    ImageIcon icon = new ImageIcon("images/blackPawn" + col + ".jpg");
                    button.setIcon(icon);
                }
                else if (x == 0) {
                    if (y == 0 || y == 7) {
                        ImageIcon icon = new ImageIcon("images/whiteRook" + col + ".jpg");
                        button.setIcon(icon);
                    }
                    else if (y == 1 || y == 6) {
                        ImageIcon icon = new ImageIcon("images/whiteBishop" + col + ".jpg");
                        button.setIcon(icon);
                    }
                    else if (y == 2 || y == 5) {
                        ImageIcon icon = new ImageIcon("images/whiteKnight" + col + ".jpg");
                        button.setIcon(icon);
                    }
                    else if (y == 3) {
                        ImageIcon icon = new ImageIcon("images/whiteQueen" + col + ".jpg");
                        button.setIcon(icon);
                    }
                    else {
                        ImageIcon icon = new ImageIcon("images/whiteKing" + col + ".jpg");
                        button.setIcon(icon);
                    }
                }
                else if (x == 7) {
                 if (y == 0 || y == 7) {
                        ImageIcon icon = new ImageIcon("images/blackRook" + col + ".jpg");
                        button.setIcon(icon);
                    }
                    else if (y == 1 || y == 6) {
                        ImageIcon icon = new ImageIcon("images/blackBishop" + col + ".jpg");
                        button.setIcon(icon);
                    }
                    else if (y == 2 || y == 5) {
                        ImageIcon icon = new ImageIcon("images/blackKnight" + col + ".jpg");
                        button.setIcon(icon);
                    }
                    else if (y == 3) {
                        ImageIcon icon = new ImageIcon("images/blackQueen" + col + ".jpg");
                        button.setIcon(icon);
                    }
                    else {
                        ImageIcon icon = new ImageIcon("images/blackKing" + col + ".jpg");
                        button.setIcon(icon);
                    }
                }
                else {
                    ImageIcon icon = new ImageIcon("images/"+ col + ".jpg");
                    button.setIcon(icon);
                }
                c.add(button);
            }
        }
 
        JLabel label = new JLabel("");
        c.add(label);
 
        /*for (int h=0; h<2;h++) {
            for (int i=0;i<9;i++) {
                if (h==1) {
                    players[h][i] = new Piece(PieceType.PAWN, PieceColour.WHITE, {h,i}, "whitePawn");
                }
            }
 
        }*/
 
        this.setTitle("Chess");
        this.setContentPane(c);
        this.setBounds(0, 0, 650, 650);
        this.setLocationRelativeTo(null);
    }
}

ok this code will compile

thanks for that. i shall have a play around with the transfer handler