java - 如何在交换图像时将 JLabel 从一个面板复制到另一个面板？

Question

我有以下布局...

在此处输入图像描述

理想情况下，当用户单击右下角滚动面板中的 JLabel 时，将图像的不同版本（没有成本和名称的图像）附加到鼠标光标上。然后，当用户在巨大的平面图面板内单击时，它会在每次单击时使用交换的图像放置一个 JLabel 的副本。When another label is selected the same thing happens. 当他们按下选择按钮（手形图标）或按下 ESC 时，标签未被选中。

这是我目前未修改的代码...

// =================================================================
//  Restaurant Builder - Interface
//  CSC - 540
//  10/22/13
//  Kris Purdy, Chris Fletemier
// =================================================================

package layout.manager;

import javax.swing.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;

public class Interface extends JFrame implements ActionListener
{
    // Class variables
    private static final int SCREEN_WIDTH = 1366;
    private static final int SCREEN_HEIGHT = 700;
    private static final int FLOORPLAN_WIDTH = 1150;
    private static final int FLOORPLAN_HEIGHT = SCREEN_HEIGHT;
    private static final int BUTTONS_WIDTH = SCREEN_WIDTH - FLOORPLAN_WIDTH;
    private static final int BUTTONS_HEIGHT = 280;
    private static final int OBJECTLIST_WIDTH = BUTTONS_WIDTH;
    private static final int OBJECTLIST_HEIGHT = SCREEN_HEIGHT - BUTTONS_HEIGHT;
    private static final int BTN_WIDTH = 50;
    private static final int BTN_HEIGHT = 50;
    private static final int LABELS_WIDTH = 180;
    private static final int LABELS_HEIGHT = 50;
    private static final int OBJECT_WIDTH = 180;
    private static final int OBJECT_HEIGHT = 225;

    private final Floorplan floorplan;
    private Estimate estimate;

    private final ImageIcon leftRotateImg;
    private final ImageIcon rightRotateImg;
    private final ImageIcon upImg;
    private final ImageIcon downImg;
    private final ImageIcon leftImg;
    private final ImageIcon rightImg;
    private final ImageIcon costImg;
    private final ImageIcon deleteImg;
    private final ImageIcon selectionImg;
    private final ImageIcon clearLayoutImg;
    private final ImageIcon hostessPodiumImg;
    private final ImageIcon roundTableImg;
    private final ImageIcon squareTableImg;
    private final ImageIcon rectangularTableImg;
    private final ImageIcon tableForTwoImg;
    private final ImageIcon boothImg;
    private final ImageIcon buffettBarImg;
    private final ImageIcon toiletPaperDispenserImg;
    private final ImageIcon toiletImg;
    private final ImageIcon towelDispenserImg;
    private final ImageIcon wasteBasketImg;
    private final ImageIcon bathroomSinkImg;
    private final ImageIcon ovenImg;
    private final ImageIcon rangeImg;
    private final ImageIcon counterTopImg;
    private final ImageIcon fridgeImg;
    private final ImageIcon freezerImg;
    private final ImageIcon kitchenSinkImg;
    private final ImageIcon dishwasherImg;
    private final ImageIcon kitchenImg;
    private final ImageIcon diningroomImg;
    private final ImageIcon bathroomImg;  

    private final JButton leftRotateBtn;
    private final JButton rightRotateBtn;
    private final JButton upBtn;
    private final JButton downBtn;
    private final JButton leftBtn;
    private final JButton rightBtn;
    private final JButton costBtn;
    private final JButton deleteBtn;
    private final JButton selectBtn;
    private final JButton clearLayoutBtn;

    private final JPanel buttons;
    private final JPanel objectlist;
    private final JPanel whitespace;

    private final JLabel kitchenLbl;
    private final JLabel diningroomLbl;
    private final JLabel bathroomLbl;

    private final RLabel hostessPodiumLbl;
    private final RLabel roundTableLbl;
    private final RLabel squareTableLbl;
    private final RLabel rectangularTableLbl;
    private final RLabel tableForTwoLbl;
    private final RLabel boothLbl;
    private final RLabel buffettBarLbl;
    private final RLabel toiletPaperDispenserLbl;
    private final RLabel toiletLbl;
    private final RLabel towelDispenserLbl;
    private final RLabel wasteBasketLbl;
    private final RLabel bathroomSinkLbl;
    private final RLabel ovenLbl;
    private final RLabel rangeLbl;
    private final RLabel counterTopLbl;
    private final RLabel fridgeLbl;
    private final RLabel freezerLbl;
    private final RLabel kitchenSinkLbl;
    private final RLabel dishwasherLbl;    

    private final JLabel recttabLbl;  // Can remove later

    private final JScrollPane scroll;
    private final RestaurantObject recttab;
    private ArrayList<RestaurantObject> list;

    // Default Constructor
    public Interface() throws IOException
    {
    //---------------------------------------------------------------MAIN WINDOW

        // Create and set up the main window
        setTitle("Restaurant Builder");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(null);

    //------------------------------------------------------------MOUSE LISTENER

        MouseListener ml = new MouseListener() {
            @Override
            public void mouseReleased(MouseEvent e) {System.out.println("Released!");}

            @Override
            public void mousePressed(MouseEvent e) {System.out.println("Pressed!");}

            @Override
            public void mouseExited(MouseEvent e) {System.out.println("Exited!");}

            @Override
            public void mouseEntered(MouseEvent e) {System.out.println("Entered!");}

            @Override
            public void mouseClicked(MouseEvent e) 
            {

               if (e.getSource() == hostessPodiumLbl)
               {
                   removeFocus();
                   hostessPodiumLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   hostessPodiumLbl.setFocus(true);
               }
               else if (e.getSource() == roundTableLbl)
                {
                   removeFocus();
                   roundTableLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   roundTableLbl.setFocus(true);                    
                }
               else if (e.getSource() == squareTableLbl)
                {
                   removeFocus();
                   squareTableLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   squareTableLbl.setFocus(true);                    
                }
               else if (e.getSource() == rectangularTableLbl)
                {
                   removeFocus();
                   rectangularTableLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   rectangularTableLbl.setFocus(true);                    
                }
               else if (e.getSource() == tableForTwoLbl)
                {
                   removeFocus();
                   tableForTwoLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   tableForTwoLbl.setFocus(true);                    
                }
               else if (e.getSource() == boothLbl)
                {
                   removeFocus();
                   boothLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   boothLbl.setFocus(true);                    
                }
               else if (e.getSource() == buffettBarLbl)
                {
                   removeFocus();
                   buffettBarLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   buffettBarLbl.setFocus(true);                    
                }
               else if (e.getSource() == toiletPaperDispenserLbl)
                {
                   removeFocus();
                   toiletPaperDispenserLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   toiletPaperDispenserLbl.setFocus(true);                    
                }
               else if (e.getSource() == toiletLbl)
                {
                   removeFocus();
                   toiletLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   toiletLbl.setFocus(true);                    
                }
               else if (e.getSource() == towelDispenserLbl)
                {
                   removeFocus();
                   towelDispenserLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   towelDispenserLbl.setFocus(true);                    
                }
               else if (e.getSource() == wasteBasketLbl)
                {
                   removeFocus();
                   wasteBasketLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   wasteBasketLbl.setFocus(true);                    
                }
               else if (e.getSource() == bathroomSinkLbl)
                {
                   removeFocus();
                   bathroomSinkLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   bathroomSinkLbl.setFocus(true);                    
                }
               else if (e.getSource() == ovenLbl)
                {
                   removeFocus();
                   ovenLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   ovenLbl.setFocus(true);                    
                }
               else if (e.getSource() == rangeLbl)
                {
                   removeFocus();
                   rangeLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   rangeLbl.setFocus(true);                    
                }
               else if (e.getSource() == counterTopLbl)
                {
                   removeFocus();
                   counterTopLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   counterTopLbl.setFocus(true);                    
                }
               else if (e.getSource() == fridgeLbl)
                {
                   removeFocus();
                   fridgeLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   fridgeLbl.setFocus(true);                    
                }
               else if (e.getSource() == freezerLbl)
                {
                   removeFocus();
                   freezerLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   freezerLbl.setFocus(true);                    
                }
               else if (e.getSource() == kitchenSinkLbl)
                {
                   removeFocus();
                   kitchenSinkLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   kitchenSinkLbl.setFocus(true);                    
                }
               else if (e.getSource() == dishwasherLbl)
                {
                   removeFocus();
                   dishwasherLbl.setBorder(BorderFactory.createLineBorder(Color.black, 3));
                   dishwasherLbl.setFocus(true);                    
                }
            }
        };

    //-----------------------------------------------------------FLOORPLAN PANEL

        // Create the floorplan panel
        floorplan = new Floorplan("resources/floorplanPic.png",
                FLOORPLAN_WIDTH, FLOORPLAN_HEIGHT);
        floorplan.setBounds(0, 0, FLOORPLAN_WIDTH, FLOORPLAN_HEIGHT);
        floorplan.setLayout(null);

    // ---------------------------------------------------------------------TEST

        recttab = new RestaurantObject("RectangularTable");

        recttabLbl = new JLabel();
        ImageIcon testImg = new ImageIcon(recttab.getImgPath());
        recttabLbl.setIcon(testImg);
        recttabLbl.setBounds(500, 200, recttab.getImgWidth(), recttab.getImgHeight());
        recttabLbl.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        //recttabLbl.setFocusable(true);
        //recttabLbl.setRequestFocusEnabled(true);
        //recttabLbl.grabFocus();
        floorplan.add(recttabLbl);

        ComponentMover cm = new ComponentMover();
        cm.registerComponent(recttabLbl);
        recttabLbl.addMouseListener(ml);

    // -----------------------------------------------------------------END TEST

    //-------------------------------------------------------------BUTTONS PANEL

        // Create the buttons panel
        buttons = new JPanel();
        buttons.setLayout(null);
        buttons.setBackground(Color.LIGHT_GRAY);
        buttons.setBounds(FLOORPLAN_WIDTH, 0, BUTTONS_WIDTH, BUTTONS_HEIGHT);

        // Create images for the buttons
        leftRotateImg = new ImageIcon("RotateLeft.png");
        rightRotateImg = new ImageIcon("RotateRight.png");
        upImg = new ImageIcon("Up.png");
        downImg = new ImageIcon("Down.png");
        leftImg = new ImageIcon("Left.png");
        rightImg = new ImageIcon("Right.png");
        costImg = new ImageIcon("Cost.png");
        deleteImg = new ImageIcon("Delete.png");
        selectionImg = new ImageIcon("Selection.png");
        clearLayoutImg = new ImageIcon("ClearLayout.png");

        // Create the buttons
        leftRotateBtn = new JButton(leftRotateImg);
        leftRotateBtn.setToolTipText("Rotate to the left.");
        leftRotateBtn.addActionListener(this);
        rightRotateBtn = new JButton(rightRotateImg);
        rightRotateBtn.setToolTipText("Rotate to the Right.");
        rightRotateBtn.addActionListener(this);
        upBtn = new JButton(upImg);
        upBtn.setToolTipText("Move the object up.");
        upBtn.addActionListener(this);
        downBtn = new JButton(downImg);
        downBtn.setToolTipText("Move the object down.");
        downBtn.addActionListener(this);
        leftBtn = new JButton(leftImg);
        leftBtn.setToolTipText("Move the object to the left.");
        leftBtn.addActionListener(this);
        rightBtn = new JButton(rightImg);
        rightBtn.setToolTipText("Move the object to the right.");
        rightBtn.addActionListener(this);
        costBtn = new JButton(costImg);
        costBtn.setToolTipText("Show the current costs for the materials "
                + "and labor.");
        costBtn.addActionListener(this);
        deleteBtn = new JButton(deleteImg);
        deleteBtn.setToolTipText("Delete the object.");
        deleteBtn.addActionListener(this);
        selectBtn = new JButton(selectionImg);
        selectBtn.setToolTipText("Deselects and changes to the select cursor.");
        selectBtn.addActionListener(this);
        clearLayoutBtn = new JButton(clearLayoutImg);
        clearLayoutBtn.setToolTipText("Removes all objects from the layout.");
        clearLayoutBtn.addActionListener(this);

        // Set the location and size of the buttons
        leftRotateBtn.setBounds(25, 25, BTN_WIDTH, BTN_HEIGHT);
        upBtn.setBounds(85, 25, BTN_WIDTH, BTN_HEIGHT);
        rightRotateBtn.setBounds(145, 25, BTN_WIDTH, BTN_HEIGHT);
        leftBtn.setBounds(25, 85, BTN_WIDTH, BTN_HEIGHT);
        costBtn.setBounds(85, 85, BTN_WIDTH, BTN_HEIGHT);
        rightBtn.setBounds(145, 85, BTN_WIDTH, BTN_HEIGHT);
        selectBtn.setBounds(25, 145, BTN_WIDTH, BTN_HEIGHT);
        downBtn.setBounds(85, 145, BTN_WIDTH, BTN_HEIGHT);
        deleteBtn.setBounds(145, 145, BTN_WIDTH, BTN_HEIGHT);
        clearLayoutBtn.setBounds(25, 205, BTN_WIDTH * 3 + 20, BTN_HEIGHT);

        // Add the buttons to the panel
        buttons.add(leftRotateBtn);
        buttons.add(upBtn);
        buttons.add(rightRotateBtn);
        buttons.add(leftBtn);
        buttons.add(costBtn);
        buttons.add(rightBtn);
        buttons.add(selectBtn);
        buttons.add(downBtn);
        buttons.add(deleteBtn);
        buttons.add(clearLayoutBtn);

    //----------------------------------------------------------OBJECTLIST PANEL

        // Create objectlist panel
        objectlist = new JPanel();
        objectlist.setBackground(Color.WHITE);
        objectlist.setLayout(new BoxLayout(objectlist, BoxLayout.Y_AXIS));

        // Create labels to store images of the objects
        hostessPodiumLbl = new RLabel();
        hostessPodiumLbl.addMouseListener(ml);
        roundTableLbl = new RLabel();
        roundTableLbl.addMouseListener(ml);
        squareTableLbl = new RLabel();
        squareTableLbl.addMouseListener(ml);
        rectangularTableLbl = new RLabel();
        rectangularTableLbl.addMouseListener(ml);
        tableForTwoLbl = new RLabel();
        tableForTwoLbl.addMouseListener(ml);
        boothLbl = new RLabel();
        boothLbl.addMouseListener(ml);
        buffettBarLbl = new RLabel();
        buffettBarLbl.addMouseListener(ml);
        toiletPaperDispenserLbl = new RLabel();
        toiletPaperDispenserLbl.addMouseListener(ml);
        toiletLbl = new RLabel();
        toiletLbl.addMouseListener(ml);
        towelDispenserLbl = new RLabel();
        towelDispenserLbl.addMouseListener(ml);
        wasteBasketLbl = new RLabel();
        wasteBasketLbl.addMouseListener(ml);
        bathroomSinkLbl = new RLabel();
        bathroomSinkLbl.addMouseListener(ml);
        ovenLbl = new RLabel();
        ovenLbl.addMouseListener(ml);
        rangeLbl = new RLabel();
        rangeLbl.addMouseListener(ml);
        counterTopLbl = new RLabel();
        counterTopLbl.addMouseListener(ml);
        fridgeLbl = new RLabel();
        fridgeLbl.addMouseListener(ml);
        freezerLbl = new RLabel();
        freezerLbl.addMouseListener(ml);
        kitchenSinkLbl = new RLabel();
        kitchenSinkLbl.addMouseListener(ml);
        dishwasherLbl = new RLabel();
        dishwasherLbl.addMouseListener(ml);

        kitchenLbl = new JLabel();
        diningroomLbl = new JLabel();
        bathroomLbl = new JLabel();

        // Load the images for the objects
        hostessPodiumImg = new ImageIcon("scrlHostessPodium.png");
        roundTableImg = new ImageIcon("scrlRoundTable.png");
        squareTableImg = new ImageIcon("scrlSquareTable.png");
        rectangularTableImg = new ImageIcon("scrlRectangularTable.png");
        tableForTwoImg = new ImageIcon("scrlTableForTwo.png");
        boothImg = new ImageIcon("scrlBooth.png");
        buffettBarImg = new ImageIcon("scrlBuffettBar.png");
        toiletPaperDispenserImg = new ImageIcon("scrlToiletPaper.png");
        toiletImg = new ImageIcon("scrlToilet.png");
        towelDispenserImg = new ImageIcon("scrlTowelDispenser.png");
        wasteBasketImg = new ImageIcon("scrlWasteBasket.png");
        bathroomSinkImg = new ImageIcon("scrlBathroomSink.png");
        ovenImg = new ImageIcon("scrlOven.png");
        rangeImg = new ImageIcon("scrlRange.png");
        counterTopImg = new ImageIcon("scrlCountertop.png");
        fridgeImg = new ImageIcon("scrlFridge.png");
        freezerImg = new ImageIcon("scrlFreezer.png");
        kitchenSinkImg = new ImageIcon("scrlKitchenSink.png");
        dishwasherImg = new ImageIcon("scrlDishwasher.png");
        kitchenImg = new ImageIcon("Kitchen.png");
        diningroomImg = new ImageIcon("DiningRoom.png");
        bathroomImg = new ImageIcon("Bathroom.png");

        // Attach the images to the labels
        hostessPodiumLbl.setIcon(hostessPodiumImg);
        roundTableLbl.setIcon(roundTableImg);
        squareTableLbl.setIcon(squareTableImg);
        rectangularTableLbl.setIcon(rectangularTableImg);
        tableForTwoLbl.setIcon(tableForTwoImg);
        boothLbl.setIcon(boothImg);
        buffettBarLbl.setIcon(buffettBarImg);
        toiletPaperDispenserLbl.setIcon(toiletPaperDispenserImg);
        toiletLbl.setIcon(toiletImg);
        towelDispenserLbl.setIcon(towelDispenserImg);
        wasteBasketLbl.setIcon(wasteBasketImg);
        bathroomSinkLbl.setIcon(bathroomSinkImg);
        ovenLbl.setIcon(ovenImg);
        rangeLbl.setIcon(rangeImg);
        counterTopLbl.setIcon(counterTopImg);
        fridgeLbl.setIcon(fridgeImg);
        freezerLbl.setIcon(freezerImg);
        kitchenSinkLbl.setIcon(kitchenSinkImg);
        dishwasherLbl.setIcon(dishwasherImg);

        kitchenLbl.setIcon(kitchenImg);
        diningroomLbl.setIcon(diningroomImg);
        bathroomLbl.setIcon(bathroomImg);

        // Add all the images to the panel
        objectlist.add(diningroomLbl);
        objectlist.add(hostessPodiumLbl);
        objectlist.add(roundTableLbl);
        objectlist.add(squareTableLbl);
        objectlist.add(rectangularTableLbl);
        objectlist.add(boothLbl);
        objectlist.add(bathroomLbl);
        objectlist.add(toiletPaperDispenserLbl);
        objectlist.add(toiletLbl);
        objectlist.add(towelDispenserLbl);
        objectlist.add(wasteBasketLbl);
        objectlist.add(bathroomSinkLbl);
        objectlist.add(kitchenLbl);
        objectlist.add(ovenLbl);
        objectlist.add(rangeLbl);
        objectlist.add(counterTopLbl);
        objectlist.add(fridgeLbl);
        objectlist.add(freezerLbl);
        objectlist.add(kitchenSinkLbl);
        objectlist.add(dishwasherLbl);

        // Create a scroll bar for the objectlist panel
        scroll = new JScrollPane(objectlist);
        scroll.setBackground(Color.WHITE);
        scroll.setBorder(null);
        scroll.getVerticalScrollBar().setUnitIncrement(16);
        scroll.setBounds(FLOORPLAN_WIDTH + 25, BUTTONS_HEIGHT, 
                OBJECTLIST_WIDTH - 25, OBJECTLIST_HEIGHT);

    //----------------------------------------------------------WHITESPACE PANEL 

        // Create a panel to add some white space
        whitespace = new JPanel();
        whitespace.setBounds(FLOORPLAN_WIDTH, BUTTONS_HEIGHT, 25, OBJECTLIST_HEIGHT);
        whitespace.setBackground(Color.WHITE);

    //---------------------------------------------------------------MAIN WINDOW

        // Display the main window
        add(floorplan);
        add(buttons);
        add(scroll);
        add(whitespace);
        setExtendedState(Frame.MAXIMIZED_BOTH);  
        setVisible(true); 
        setResizable(false);
    }

    //-----------------------------------------------------------ACTION LISTENER
    @Override
    public void actionPerformed(ActionEvent e) 
    {
        int x, y, imgW, imgH;
        x = recttab.getX();
        y = recttab.getY();
        imgW = recttab.getImgWidth();
        imgH = recttab.getImgHeight();

        if (e.getSource() == leftRotateBtn)
        {
            System.out.println("leftRotateBtn");
        }
        else if (e.getSource() == upBtn)
        {
            if (y > 5)
            {
                y -= 5;
                recttab.setY(y);
                recttabLbl.setBounds(x, y, imgW, imgH);
            }

        }
        else if (e.getSource() == rightRotateBtn)
        {
            System.out.println("rightRotateBtn");
        }
        else if (e.getSource() == leftBtn)
        {
            if (x > 5)
            {
                x -= 5;
                recttab.setX(x);
                recttabLbl.setBounds(x, y, imgW, imgH);
            }
        }
        else if (e.getSource() == costBtn)
        {
            estimate = new Estimate();
        }
        else if (e.getSource() == rightBtn)
        {
            if (x < (FLOORPLAN_WIDTH - recttab.getImgWidth() - 5))
            {
                x += 5;
                recttab.setX(x);
                recttabLbl.setBounds(x, y, imgW, imgH);
            }
        }
        else if (e.getSource() == selectBtn)
        {
            removeFocus();
        }
        else if (e.getSource() == downBtn)
        {
            if (y < (SCREEN_HEIGHT - recttab.getImgHeight() - 5))
            {
                y += 5;
                recttab.setY(y);
                recttabLbl.setBounds(x, y, imgW, imgH);
            }
        }
        else if (e.getSource() == deleteBtn)
        {
            System.out.println("deleteBtn");
        }
        else if (e.getSource() == clearLayoutBtn)
        {
            System.out.println("clearLayoutBtn");
        }    
    }

    // New label class to allow lables to have focus
    private class RLabel extends JLabel{
        private boolean focus;

        // Does the object have focus
        @Override
        public boolean hasFocus()
        {
            return this.focus;
        }

        // Set the focus
        public void setFocus(boolean f)
        {
            this.focus = f;
        }
    }

    // Removes focus from all labels
    private void removeFocus()
    {
        hostessPodiumLbl.setBorder(null);
        hostessPodiumLbl.setFocus(true);
        roundTableLbl.setBorder(null);
        roundTableLbl.setFocus(true);
        squareTableLbl.setBorder(null);
        squareTableLbl.setFocus(true);
        rectangularTableLbl.setBorder(null);
        rectangularTableLbl.setFocus(true);
        tableForTwoLbl.setBorder(null);
        tableForTwoLbl.setFocus(true);
        boothLbl.setBorder(null);
        boothLbl.setFocus(true);
        buffettBarLbl.setBorder(null);
        buffettBarLbl.setFocus(true);
        toiletPaperDispenserLbl.setBorder(null);
        toiletPaperDispenserLbl.setFocus(true);
        toiletLbl.setBorder(null);
        toiletLbl.setFocus(true);
        towelDispenserLbl.setBorder(null);
        towelDispenserLbl.setFocus(true);
        wasteBasketLbl.setBorder(null);
        wasteBasketLbl.setFocus(true);
        bathroomSinkLbl.setBorder(null);
        bathroomSinkLbl.setFocus(true);
        ovenLbl.setBorder(null);
        ovenLbl.setFocus(true);
        rangeLbl.setBorder(null);
        rangeLbl.setFocus(true);
        counterTopLbl.setBorder(null);
        counterTopLbl.setFocus(true);
        fridgeLbl.setBorder(null);
        fridgeLbl.setFocus(true);
        freezerLbl.setBorder(null);
        freezerLbl.setFocus(true);
        kitchenSinkLbl.setBorder(null);
        kitchenSinkLbl.setFocus(true);
        dishwasherLbl.setBorder(null);  
        dishwasherLbl.setFocus(true);
    }
}

一般来说，我对 GUI 没有太多经验，所以能走到这一步真是个奇迹。有没有人做过这样的事情？任何建议如何使它工作？

score 0 · Accepted Answer

我想这是给你的答案。

1) 获取您所有的图像并从它们的成本和名称数据中删除。

2）在 LayoutManager 的帮助下添加你的组件，我认为GridBagLayout适合这个目的。

3）在（JLabel）的帮助下添加您的图像，然后在第一个下添加带有名称属性的JLabel，然后添加带有成本的JLabel。

如果您以这种方式进行所有操作，则可以仅拖动图像而无需其他信息，它可以解决一个实体的不同图像的问题。

作为推荐：

1）mouseClicked用下一种方式改变你的方法：

public void mouseClicked(MouseEvent e) {
    removeFocus();
    ((RLabel)e.getSource()).setBorder(BorderFactory.createLineBorder(Color.black, 3));
    ((RLabel)e.getSource()).setFocus(true);
}

它从重复代码中清除方法。

2）而不是使用setBounds()方法使用LayoutManager它完全适用于组件大小。

3）永远不要那样做setLayout(null);

4）将您的构造方法拆分为一些简单明了的方法。它看起来真的很糟糕。

java - 如何在交换图像时将 JLabel 从一个面板复制到另一个面板？

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