JAVA 鼠标拖放效果示例

/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package DragTest; import java.awt.*; import javax.swing.*; import java.awt.Graphics.*; import java.util.*; import java.awt.event.*; //definition of the TableManager class class TableManager { public TableManager(final JLayeredPane diningHall) { int hallWidth = diningHall.getWidth(); //get the width of the diningHall int hallHeight = diningHall.getHeight(); //get the height of the diningHall Table tempTable = new Table(); //a temporary table for getting the table size int tableAreaX = Table.getTableSize().width + 20; //horizotal size of the table area int tableAreaY = Table.getTableSize().height + 20; //horizotal size of the table area int horiQuantity = hallWidth / tableAreaX; //table quantity in the horizontal direction int vertQuantity = hallHeight / tableAreaY; //table quantity in the vertical direction int tableQuantity = horiQuantity * vertQuantity; //get the quantity of the tables that the hall may contain tableGroup = new ArrayList<Table>(tableQuantity); //initialize the table collection draggingImage = new DraggingImage("/ImageResources/bookingClock.png"); //initialize the dragging image as a booking clock //set the mouse listener mouseListener = new MouseAdapter() { @Override public void mouseEntered(MouseEvent evt) { Table evtSource = ((Table)evt.getSource()); //get the event source mouseEnteredTableArea = evtSource; //mark the mouseEnteredTableArea evtSource.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR)); //set the proper table image if (evtSource.getTableState() == TableState.AVAILABLE) { evtSource.setTableImage("/ImageResources/emptyTableWhenSelected.png"); } else if (evtSource.getTableState() == TableState.BOOKED) { evtSource.setTableImage("/ImageResources/bookedTableWhenSelected.png"); } else if (evtSource.getTableState() == TableState.USING) { evtSource.setTableImage("/ImageResources/usingTableWhenSelected.png"); } } @Override public void mouseExited(MouseEvent evt) { Table evtSource = ((Table)evt.getSource()); //get the event source mouseEnteredTableArea = null; //mark the mouseEnteredTableArea if (!draggingTag) { evtSource.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR)); } //set the proper table image if (evtSource.getTableState() == TableState.AVAILABLE) { evtSource.setTableImage("/ImageResources/emptyTable.png"); } else if (evtSource.getTableState() == TableState.BOOKED) { evtSource.setTableImage("/ImageResources/bookedTable.png"); } else if (evtSource.getTableState() == TableState.USING) { evtSource.setTableImage("/ImageResources/usingTable.png"); } } @Override public void mouseReleased(MouseEvent evt) { Table evtSource = ((Table)evt.getSource()); //get the event source diningHall.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR)); //set the state of the source table if (mouseEnteredTableArea != null && mouseEnteredTableArea.getTableState() == TableState.AVAILABLE && evtSource.getTableState() == TableState.BOOKED) { evtSource.setTableAsAvailable(); //set the source table as available mouseEnteredTableArea.setTableAsBooked(); //set the target table as booked mouseEnteredTableArea.setTableImage("/ImageResources/bookedTableWhenSelected.png"); //set the table image as selected draggingTag = false; //reset the dragging tag draggingImage.setVisible(false); //set the visibility of the dragging image diningHall.remove(draggingImage); //remove the dragging image from the dinning hall } else if (evtSource.getTableState() == TableState.BOOKED) { evtSource.setTableAsBooked(); //reset the booked table state when table exchanging fails draggingTag = false; //reset the dragging tag draggingImage.setVisible(false); //set the visibility of the dragging image diningHall.remove(draggingImage); //remove the dragging image from the dinning hall } } }; //set the mouse motion listener mouseMotionListener = new MouseMotionAdapter() { @Override public void mouseDragged(MouseEvent evt) { Table evtSource = ((Table)evt.getSource()); //get the event source if (evtSource.getTableState() == TableState.BOOKED) { evtSource.setTableImage("/ImageResources/bookedTableWhenExchanging.png"); diningHall.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR)); if (!draggingTag) { draggingTag = true; //set the dragging tag draggingImage.setSize(draggingImage.getImageSize()); diningHall.add(draggingImage); //add the dragging image into the diningHall diningHall.moveToFront(draggingImage); //set the dragging image above any table draggingImage.setVisible(true); //set the visibility of the dragging image } draggingImage.setLocation(evtSource.getX() + evt.getX() - Table.getTableSize().width / 2, evtSource.getY() + evt.getY() - Table.getTableSize().height / 2); //set location of the dragging image } } }; //initialize the diningHall for (int i = 0; i < vertQuantity; ++i) { for (int j = 0; j < horiQuantity; ++j) { tableInstance = new Table(); tableInstance.setLocation(j * tableAreaX + 10, i * tableAreaY + 10); //set the location of the table panel //set mouse listener tableInstance.addMouseListener(mouseListener); //set mouse motion listener tableInstance.addMouseMotionListener(mouseMotionListener); tableGroup.add(tableInstance); //add a new table into the table collection diningHall.add(tableInstance); //add the new table into the diningHall } } } private ArrayList<Table> tableGroup; //collection of the tables private Table tableInstance = null; //a instance of the Table class private MouseAdapter mouseListener = null; //a mouse listener private MouseMotionAdapter mouseMotionListener = null; //a mouse motion listener private Table mouseEnteredTableArea = null; //the table area that the mouse entered private DraggingImage draggingImage = null; //the image to display when dragging private boolean draggingTag = false; //tag to specify whether it is in dragging state }