学步园

下面的Demo主要用Java Swing实现了JTabbedPane内的tab可以拖拽到另一个JTabbedPane里的功能。

其实只要是用DnDTabbedPane生成的instance， 它里面所属的tab就可以随意拖拽到另一个DnDTabbedPane。

key words： DragGestureListener, DragSourceListener, Transferable, DropTargetListener.

/*<br /> * DnDTabbedPaneExe.java<br /> * Description: Initialize the UI and run the test.<br /> */<br /> import java.awt.BorderLayout;<br /> import javax.swing.*;<br /> public class DnDTabbedPaneExe<br /> {<br /> public DnDTabbedPaneExe()<br /> {<br /> initUI();<br /> }</p> <p> public void initUI()<br /> {<br /> JFrame test = new JFrame("Drag and Drop Tabs Test");<br /> test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);<br /> test.setLocation(400, 400);<br /> test.setSize(1000, 450);</p> <p> // Our DnDTabbedPane here.<br /> DnDTabbedPane tabs = new DnDTabbedPane();<br /> DnDTabbedPane tabs2 = new DnDTabbedPane();</p> <p> JPanel panel = new JPanel();<br /> panel.add(new JButton("1"));<br /> panel.add(new JButton("123"));<br /> ImageIcon icon = new ImageIcon("smallChrome.JPG");<br /> tabs.addTab("Table",icon, initTable());<br /> tabs.addTab("ButtonGroup",icon, panel);<br /> tabs.addTab("JTextArea",icon, new JTextArea("2"));<br /> tabs.addTab("JLabel",icon, new JLabel("3"));<br /> tabs.addTab("Button",icon, new JButton("4"));<br /> tabs.addTab("Table2",icon, initTable());</p> <p> tabs2.addTab("Story", icon, new JTextArea("This is a story"));<br /> tabs2.addTab("A Button",icon, new JButton("A"));<br /> tabs2.addTab("B Button",icon, new JButton("B")); </p> <p> test.add(initTree(), BorderLayout.WEST);<br /> test.add(tabs, BorderLayout.EAST);<br /> test.add(tabs2, BorderLayout.CENTER);<br /> test.setVisible(true);<br /> }</p> <p> /*<br /> * Main<br /> */<br /> public static void main(String[] args)<br /> {<br /> DnDTabbedPaneExe frame = new DnDTabbedPaneExe();<br /> }</p> <p> // Methods initialize some tabs</p> <p> /*<br /> * Initialize JTree with default JTree example while new JTree()<br /> */<br /> public class InitJTree extends JTree<br /> {<br /> public InitJTree()<br /> {<br /> super();<br /> this.setAutoscrolls(true);<br /> }<br /> }</p> <p> /*<br /> * Return a JScrollPane with draggable JTree<br /> */<br /> private JScrollPane initTree()<br /> {<br /> JTree myTree;<br /> myTree = new JTree();<br /> myTree.setDragEnabled(true);<br /> myTree.setTransferHandler(new TreeTransferHandler());// -----TreeTransferHandler here-------<br /> JScrollPane treePane = new JScrollPane(myTree);<br /> return treePane;<br /> }</p> <p> /*<br /> * Return a JScrollPane with table accept the draggable Tree nodes<br /> */<br /> private JScrollPane initTable()<br /> {<br /> JTable table = new JTable(8, 3);<br /> for (int i = 0; i < 8; i++)<br /> {<br /> table.setValueAt(i + ",0", i, 0);<br /> }<br /> table.setTransferHandler(new TableTransferHandler());// -----TableTransferHandler here------<br /> return new JScrollPane(table);<br /> }<br /> }<br />  

/*<br /> * DnDTabbedPane.java<br /> * Description: Tabs of this DnDTabbedPane can be dragged and dropped.<br /> */<br /> import java.awt.BorderLayout;<br /> import java.awt.Component;<br /> import java.awt.Cursor;<br /> import java.awt.Dimension;<br /> import java.awt.Graphics;<br /> import java.awt.Insets;<br /> import java.awt.MouseInfo;<br /> import java.awt.Point;<br /> import java.awt.Rectangle;<br /> import java.awt.TextArea;<br /> import java.awt.Window;<br /> import java.awt.datatransfer.*;<br /> import java.awt.dnd.*;<br /> import java.awt.event.ActionEvent;<br /> import java.awt.event.ActionListener;<br /> import java.awt.event.MouseAdapter;<br /> import java.awt.event.MouseEvent;<br /> import java.awt.image.BufferedImage;<br /> import java.util.ArrayList;<br /> import javax.swing.*;<br /> import javax.swing.border.EmptyBorder;<br /> import javax.swing.event.ChangeEvent;<br /> import javax.swing.event.ChangeListener;<br /> import javax.swing.event.PopupMenuEvent;<br /> import javax.swing.event.PopupMenuListener;<br /> import javax.swing.plaf.basic.BasicTabbedPaneUI;<br /> import javax.swing.tree.TreePath;<br /> public class DnDTabbedPane extends JTabbedPane<br /> {<br /> private static ImageIcon _iconCloseRed = new ImageIcon("close-red.gif");<br /> private static ImageIcon _iconCloseBlack = new ImageIcon("close-black.gif");<br /> private static ImageIcon _iconIDE = new ImageIcon("IDE.JPG");<br /> private static ImageIcon _iconChrome = new ImageIcon("chrome.PNG");<br /> //private final static int BUTTON_HOT = 2;<br /> private final static int BUTTON_NORMAL = 1;<br /> private final static int BUTTON_NULL = 0;<br /> private int _preSelectedTab = -1;<br /> private int _preRolloverTab = -1;<br /> private boolean _bClosed = true;<br /> private int dragTabIndex = -1;</p> <p> /**<br /> * DnDTabbedPane class constructor: Here we initialize DragSourceListener<br /> * and DragGestureListnener<br /> */<br /> public DnDTabbedPane()<br /> {<br /> super();<br /> //setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);<br /> setAutoscrolls(true);<br /> initComponents();</p> <p> // set JTabbedPane as DropTarget and DragSource here.<br /> new DragSource().createDefaultDragGestureRecognizer(DnDTabbedPane.this, DnDConstants.ACTION_COPY_OR_MOVE, new DnDDragGestureListener());<br /> new DropTarget(DnDTabbedPane.this, DnDConstants.ACTION_COPY_OR_MOVE, new DnDTargetListener(), true);<br /> }</p> <p> /**<br /> *<br /> * Override AddTab with arguments: title and Component to the JTabbedPane, add close button to tab<br /> * @see javax.swing.JTabbedPane#addTab(java.lang.String, java.awt.Component)<br /> */<br /> public void addTab(String title,Icon iconTab, Component comp)<br /> {<br /> add(comp);<br /> int index = indexOfComponent(comp);<br /> TabComponent tabComponent = new TabComponent(title, iconTab);<br /> setTabComponentAt(index, tabComponent);<br /> int indexTab = getSelectedIndex();<br /> setTabCloseButtonStatus(indexTab, BUTTON_NORMAL);<br /> }</p> <p> /**<br /> * Control the appearance of close buttons on tabs.<br /> */<br /> private void initComponents()<br /> {<br /> if (_bClosed)<br /> {<br /> // If current component needs to support the Close Button, we should add the<br /> // ChangeListener event to update the icon of Close Button according to the selected<br /> // status.<br /> addChangeListener(new ChangeListener()<br /> {<br /> @Override<br /> public void stateChanged(ChangeEvent e)<br /> {<br /> int indexTab = getSelectedIndex();<br /> if (_preSelectedTab != indexTab)<br /> {<br /> // Remove the icon from previous selected tab<br /> setTabCloseButtonStatus(_preSelectedTab, BUTTON_NULL);<br /> // Set current selected tab to be BUTTON_NORMAL<br /> setTabNormalByMouse(indexTab);<br /> _preSelectedTab = indexTab;<br /> }<br /> else<br /> {<br /> //After moving, the original selected index in src is not changed,<br /> //but a new tab is selected, we have to enable close button for<br /> //this new tab.<br /> setTabNormalByMouse(_preSelectedTab);<br /> }<br /> }<br /> });<br /> addMouseListener(new MouseAdapter()<br /> {<br /> public void mouseExited(MouseEvent e)<br /> {<br /> // If user move mouse from TabbedComponent to Close button, it will trigger the<br /> // mouseExited event, so we need to add the !mouseOnCloseButton(_preRolloverTab)<br /> // condition. otherwise icon will be sparkling obviously<br /> //if (_preRolloverTab >= 0 && _preRolloverTab != getSelectedIndex() && !mouseOnCloseButton(_preRolloverTab))<br /> if (_preRolloverTab >= 0 && _preRolloverTab != getSelectedIndex())<br /> {<br /> // If mouse exited TabbedPane and not on the close button and<br /> // current tab is not selected, it needs to clean up previous tab icon.<br /> setTabCloseButtonStatus(_preRolloverTab, BUTTON_NULL);<br /> }<br /> }<br /> });<br /> // If tab is too much, it will be shown by multilayer. The width of header<br /> // will be bigger than that of tab component. At this time, if user move<br /> // mouse to the empty area we need to set the rollovered tab to be normal.<br /> addMouseMotionListener(new MouseAdapter()<br /> {<br /> public void mouseMoved(MouseEvent e)<br /> {<br /> int pointingTabIndex = tabForCoordinate(e.getPoint());<br /> if (_preRolloverTab >= 0 && _preRolloverTab != pointingTabIndex )<br /> {<br /> // If mouse enter another tab, we need to update current close button<br /> // and reset that of the leaving tab<br /> if (_preRolloverTab != getSelectedIndex())<br /> setTabCloseButtonStatus(_preRolloverTab, BUTTON_NULL);<br /> //if _preRolloverTab == getSelectedIndex(), it will always be with a close button.<br /> /*else<br /> setTabCloseButtonStatus(_preRolloverTab, BUTTON_NORMAL);*/<br /> }<br /> if (pointingTabIndex >= 0)<br /> {<br /> setTabNormalByMouse(pointingTabIndex);<br /> _preRolloverTab = pointingTabIndex;<br /> }<br /> }<br /> });<br /> }<br /> }</p> <p> //Methods control behaviors of close button on tab.<br /> /**<br /> * Set the tab of this index to be normal with a black close button.<br /> *<br /> * _button.setRolloverIcon(New ImageIcon("close-red.jpg")); is used to control<br /> * the appearance when the mouse is over the close button.<br /> */<br /> private void setTabNormalByMouse(int index)<br /> {<br /> setTabCloseButtonStatus(index, BUTTON_NORMAL);<br /> }<br /> /**<br /> * Reset the icon of close button on the indexed tab.<br /> */<br /> private void setTabCloseButtonStatus(int indexTab, int buttonStatus)<br /> {<br /> if (indexTab >= 0 && indexTab < getTabCount())<br /> {<br /> TabComponent tabComponent = (TabComponent) getTabComponentAt(indexTab);<br /> if (tabComponent != null)<br /> {<br /> tabComponent.setCloseButtonStatus(buttonStatus);<br /> }<br /> }<br /> }<br /> /**<br /> * According to the Point, get the related index of Tab.<br /> */<br /> private int tabForCoordinate(Point p)<br /> {<br /> int index = getUI().tabForCoordinate(DnDTabbedPane.this, p.x, p.y);<br /> return index;<br /> }</p> <p> /**<br /> * Inner class DnDDragGestureListener implements DragGestureListener.<br /> * Start the drag here.<br /> */<br /> class DnDDragGestureListener implements DragGestureListener<br /> {<br /> public void dragGestureRecognized(DragGestureEvent e)<br /> {<br /> //Get the drag source panel size<br /> int srcWidth = e.getComponent().getWidth();<br /> int srcHeight = e.getComponent().getHeight();<br /> System.out.println("Source size: " + srcWidth + "," + srcHeight);</p> <p> Point tabPt = e.getDragOrigin();<br /> dragTabIndex = indexAtLocation(tabPt.x, tabPt.y);<br /> if (dragTabIndex < 0)<br /> {<br /> System.out.println("Please drag a tab");<br /> return;<br /> }<br /> //GhostedDragImage image = new GhostedDragImage (e.getSource(),this,new Point(400,400),_iconIDE,new Point(5,5),true);<br /> try<br /> {<br /> System.out.println("<<Tab drag start...>>");<br /> Cursor cursor = getToolkit().createCustomCursor(_iconChrome.getImage(), new Point(0,0), "usr");<br /> //dge.startDrag(cursor, t, this);<br /> //e.startDrag(DragSource.DefaultMoveDrop,_iconIDE.getImage(),new Point(5,5), new DnDTransferable(), new DnDSourceListener());<br /> e.startDrag(cursor, new DnDTransferable(), new DnDSourceListener());</p> <p> }<br /> catch (InvalidDnDOperationException idoe)<br /> {<br /> idoe.printStackTrace();<br /> }<br /> }<br /> }</p> <p> /**<br /> * Inner class DnDTransferable implements Transferable.<br /> * 1. Specify the data type we want to transfer.<br /> * 2. Also specify the getTransferData(DataFloavor flavor) that will be invoked in target's drop.<br /> */<br /> class DnDTransferable implements Transferable<br /> {<br /> DataFlavor FLAVOR = new DataFlavor(DataFlavor.javaRemoteObjectMimeType, "javaRemoteObjectMimeType");<br /> DataFlavor[] flavors = {FLAVOR};</p> <p> public Object getTransferData(DataFlavor flavor)<br /> {<br /> System.out.println("Enter Transferable");</p> <p> if (flavor.isMimeTypeEqual(DataFlavor.javaRemoteObjectMimeType))<br /> {<br /> System.out.println("True: This is an javaRemoteObjectMimeType");<br /> return DnDTabbedPane.this;<br /> }<br /> else<br /> {<br /> System.out.println("False: This is null");<br /> return null;<br /> }<br /> }</p> <p> public DataFlavor[] getTransferDataFlavors()<br /> {<br /> return flavors;<br /> }</p> <p> public boolean isDataFlavorSupported(DataFlavor flavor)<br /> {<br /> return flavor.isMimeTypeEqual(DataFlavor.javaRemoteObjectMimeType);<br /> }<br /> }</p> <p> /**<br /> * Inner class DnDSourceListener implements DragSourceListener:<br /> * All actions when this panel<br /> * is treated as a source while dragging<br /> */<br /> class DnDSourceListener implements DragSourceListener<br /> {<br /> public void dragEnter(DragSourceDragEvent e)<br /> {<br /> Cursor cursor = getToolkit().createCustomCursor(_iconChrome.getImage(), new Point(0,0), "usr");<br /> e.getDragSourceContext().setCursor(cursor);<br /> //e.getDragSourceContext().setCursor(DragSource.DefaultMoveDrop);<br /> }</p> <p> public void dragExit(DragSourceEvent e)<br /> {<br /> Cursor cursor = getToolkit().createCustomCursor(_iconCloseRed.getImage(), new Point(0,0), "usr");<br /> e.getDragSourceContext().setCursor(cursor);<br /> //e.getDragSourceContext().setCursor(DragSource.DefaultMoveNoDrop);<br /> }</p> <p> public void dragOver(DragSourceDragEvent e)<br /> {<br /> /*Point tabPt = e.getLocation();<br /> SwingUtilities.convertPointFromScreen(tabPt, DnDTabbedPane.this);<br /> int currentIndex = indexAtLocation(tabPt.x, tabPt.y);<br /> if(currentIndex<0)<br /> {<br /> System.out.println(currentIndex + "out of index");<br /> Cursor cursor = getToolkit().createCustomCursor(_iconCloseRed.getImage(), new Point(0,0), "usr");<br /> e.getDragSourceContext().setCursor(cursor);<br /> }<br /> else<br /> {<br /> Cursor cursor = getToolkit().createCustomCursor(_iconChrome.getImage(), new Point(0,0), "usr");<br /> e.getDragSourceContext().setCursor(cursor);<br /> }*/<br /> }</p> <p> public void dragDropEnd(DragSourceDropEvent e)<br /> {<br /> }</p> <p> public void dropActionChanged(DragSourceDragEvent e)<br /> {<br /> }<br /> }</p> <p> /**<br /> * Target Inner class DnDTargetListener: All actions when this panel<br /> * is treated as a target while dragging.<br /> */<br /> class DnDTargetListener implements DropTargetListener<br /> {<br /> public void dragEnter(DropTargetDragEvent ev)<br /> {<br /> //Get the panel size of the current target.<br /> Object obj = ev.getSource();<br /> Component targetComp = ((DropTarget) obj).getComponent();<br /> System.out.println("Current dropPanel size: " + targetComp.getWidth() + "," + targetComp.getHeight());</p> <p> System.out.println("Drag enter target");<br /> targetAcceptDrag(ev);<br /> }</p> <p> public void dragExit(DropTargetEvent ev)<br /> {<br /> }</p> <p> public void dragOver(DropTargetDragEvent ev)<br /> {<br /> Object target = ev.getSource();<br /> boolean targetIsJTabbedPane = ((DropTarget) target).getComponent() instanceof JTabbedPane;<br /> if (targetIsJTabbedPane)<br /> {<br /> targetAcceptDrag(ev);<br /> }<br /> // System.out.println("(X,Y):" + ev.getLocation().x + "," + ev.getLocation().y);<br /> }</p> <p> public void dropActionChanged(DropTargetDragEvent ev)<br /> {<br /> targetAcceptDrag(ev);<br /> }</p> <p> public void drop(DropTargetDropEvent ev)<br /> {<br /> try<br /> {<br /> Object target = ev.getSource();<br /> if (!bTargetIsTab(target))<br /> {<br /> return;<br /> }<br /> JTabbedPane srcTabbedPane;<br /> String title;<br /> Component component;<br /> DataFlavor[] flavors = ev.getTransferable().getTransferDataFlavors();<br /> System.out.println(flavors.length + " Flavor: " + flavors[0].toString());<br /> JTabbedPane destTabbedPane = (JTabbedPane) ((DropTarget) target).getComponent();<br /> //BasicTabbedPaneUI tabbedPaneUI = new BasicTabbedPaneUI (jtp);<br /> for (int i = 0; i < flavors.length; i++)<br /> {<br /> if (flavors[i].isMimeTypeEqual(DataFlavor.javaRemoteObjectMimeType))// Accept tabs<br /> {<br /> System.out.println("<<Accept Tabs...>>");<br /> // Get source tab's title and selectedComponent, add to the target<br /> // JTabbedPane<br /> Object obj = ev.getTransferable().getTransferData(flavors[i]);<br /> if(! (obj instanceof JTabbedPane))<br /> {<br /> return;<br /> }<br /> srcTabbedPane = (JTabbedPane) obj;<br /> title = getTitle(srcTabbedPane);<br /> Icon icon = getIcon(srcTabbedPane);<br /> component = srcTabbedPane.getSelectedComponent();<br /> //Move original tab to the destination.<br /> destTabbedPane.addTab(title,icon, component);<br /> destTabbedPane.setSelectedIndex(destTabbedPane.getTabCount() - 1);</p> <p> //If setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT); we have to consider the condition that<br /> //after adding tab to a lot of tabs, it has to auto scroll to the new added selected tab<br /> //destTabbedPane.scrollRectToVisible(getSelectedTabBound(destTabbedPane));<br /> //destTabbedPane.gett.scrollRectToVisible(getBounds());<br /> }<br /> else if (flavors[i].isFlavorSerializedObjectType())// Accept the tree nodes<br /> {<br /> ImageIcon nodeIcon = new ImageIcon("IDE.JPG");<br /> System.out.println("<<Accept TreeNode...>>");<br /> Object obj = ev.getTransferable().getTransferData(flavors[i]);<br /> if(!(obj instanceof ArrayList))<br /> {<br /> return;<br /> }<br /> ArrayList<TreePath> treeList = new ArrayList<TreePath>((ArrayList<TreePath>) obj);<br /> for (int j = 0; j < treeList.size(); j++)<br /> {<br /> destTabbedPane.addTab(treeList.get(j).getLastPathComponent().toString(), nodeIcon, new TextArea(treeList.get(j).toString()));<br /> }<br /> destTabbedPane.setSelectedIndex(destTabbedPane.getTabCount() - 1);<br /> }<br /> }<br /> }<br /> catch (Exception ex)<br /> {<br /> ex.printStackTrace();<br /> }<br /> ev.dropComplete(true);<br /> repaint();<br /> }</p> <p> //Methods help to drop<br /> /**<br /> * Accept the drag<br /> */<br /> private void targetAcceptDrag(DropTargetDragEvent ev)<br /> {<br /> ev.acceptDrag(ev.getDropAction());<br /> }</p> <p> private boolean bTargetIsTab (Object target)<br /> {<br /> return ((DropTarget) target).getDropTargetContext().getComponent() instanceof JTabbedPane;<br /> }<br /> /**<br /> * Get tab component's title from original tab<br /> * @param JTabbedPane<br /> * @return String<br /> */<br /> private String getTitle(JTabbedPane tabbedPane)<br /> {<br /> return ((TabComponent)tabbedPane.getTabComponentAt(tabbedPane.getSelectedIndex())).getTitle();<br /> }<br /> /**<br /> * Get tab component's Icon from original tab<br /> * @param JTabbedPane<br /> * @return Icon<br /> */<br /> private Icon getIcon(JTabbedPane tabbedPane)<br /> {<br /> return ((TabComponent)tabbedPane.getTabComponentAt(tabbedPane.getSelectedIndex())).getIcon();<br /> }<br /> }</p> <p> //Component to be used as tab component of JTabbedPane.<br /> /**<br /> * Component to be used as tab component of TabbedPane. It contains two JLabel to show the text<br /> * and icon and a JButton to close the tab it belongs to<br /> */<br /> class TabComponent extends JPanel<br /> {<br /> private static final long serialVersionUID = 2955071016071608002L;<br /> private JButton _button;<br /> private JLabel _labelTitle;<br /> private JLabel _labelIcon;<br /> private int _statusCloseButton = -1;</p> <p> public TabComponent(final String tabTitle, final Icon icon)<br /> {<br /> super();<br /> initComponents(tabTitle, icon);<br /> }<br /> /**<br /> * Get the icon of the icon label.<br /> * @return<br /> */<br /> public Icon getIcon()<br /> {<br /> return _labelIcon.getIcon();<br /> }<br /> /**<br /> * Get the value of title label.<br /> * @return<br /> */<br /> public String getTitle()<br /> {<br /> return _labelTitle.getText();<br /> }<br /> /**<br /> * Update the value of title label.<br /> */<br /> public void setTitle(String text)<br /> {<br /> _labelTitle.setText(text);<br /> }</p> <p> /**<br /> * Update the status of close button.<br /> */<br /> public void setCloseButtonStatus(int status)<br /> {<br /> if (_statusCloseButton != status)<br /> {<br /> setButtonIcon(status);<br /> _statusCloseButton = status;<br /> }<br /> }</p> <p> /**<br /> * Update the close button's icon directly.<br /> * BUTTON_HOT: Mouse is on the button.<br /> * BUTTON_NORMAL: Mouse is on the tab header but not on the button.<br /> * BUTTON_NULL: : Mouse is not on the tab header and button.<br /> */<br /> private void setButtonIcon(int buttonStatus)<br /> {<br /> if (_button != null)<br /> {<br /> // If icon is same as previous, JDK will not reset its icon.<br /> switch (buttonStatus)<br /> {<br /> /*case BUTTON_HOT:<br /> _button.setIcon(_iconCloseRed);<br /> break;*/<br /> case BUTTON_NORMAL:<br /> _button.setIcon(_iconCloseBlack);<br /> break;<br /> case BUTTON_NULL:<br /> _button.setIcon(null);<br /> }<br /> }<br /> }</p> <p> /**<br /> * Init components supposed to be on the tab<br /> * @param tabTitle<br /> * @param icon<br /> */<br /> private void initComponents(final String tabTitle, final Icon icon)<br /> {<br /> setLayout(new BoxLayout(this, BoxLayout.X_AXIS));<br /> // set the component to be transparent.<br /> setOpaque(false);<br /> setBorder(new EmptyBorder(0, 0, 0, 0));</p> <p> // make tab icon<br /> if (icon != null)<br /> {<br /> _labelIcon = new JLabel();<br /> _labelIcon.setPreferredSize(new Dimension(19, 19));<br /> _labelIcon.setIcon(icon);<br /> add(_labelIcon);<br /> add(Box.createRigidArea(new Dimension(5, 5)));<br /> }</p> <p> // make tab title<br /> _labelTitle = new JLabel(tabTitle);<br /> add(_labelTitle);<br /> add(Box.createRigidArea(new Dimension(5, 5)));</p> <p> // make close button<br /> if (_bClosed)<br /> {<br /> _button = new JButton();<br /> _button.setBorderPainted(false);<br /> _button.setFocusable(false);<br /> // make it to be transparent<br /> _button.setContentAreaFilled(false);<br /> _button.setPreferredSize(new Dimension(19, 19));<br /> _button.setMargin(new Insets(0, 0, 0, 0));<br /> _button.setRolloverIcon(_iconCloseRed);<br /> _button.setToolTipText("Close");<br /> _button.addActionListener(new ActionListener()<br /> {<br /> @Override<br /> public void actionPerformed(ActionEvent e)<br /> {<br /> clickCloseButton(e, indexOfTabComponent(TabComponent.this));<br /> }<br /> });<br /> _button.addMouseListener(new MouseAdapter()<br /> {<br /> @Override<br /> public void mouseReleased(MouseEvent evt)<br /> {<br /> // If user right/middle click the mouse, we should convert mouse event to<br /> // the TabbedPane to change selection. If user left click the mouse, we do<br /> // not need to convert mouse event to the TabbedPanel because the<br /> // actionListener of Button will be executed to close tab.<br /> if (evt.getButton() != MouseEvent.BUTTON1)<br /> convertMouseEventToTabbedPane(_button, evt);<br /> }</p> <p> @Override<br /> public void mousePressed(MouseEvent evt)<br /> {<br /> // If user right/middle click the mouse, we should convert mouse event to<br /> // the TabbedPane to change selection. If user left click the mouse, we do<br /> // not need to convert mouse event to the TabbedPanel because the<br /> // actionListener of Button will be executed to close tab.<br /> if (evt.getButton() != MouseEvent.BUTTON1)<br /> convertMouseEventToTabbedPane(_button, evt);<br /> }<br /> });</p> <p> _button.addMouseMotionListener(new MouseAdapter()<br /> {<br /> public void mouseMoved(MouseEvent evt)<br /> {<br /> // convert the mouse move event to the the CLTabbedPane, it is used to keep the<br /> // icon to be hot.<br /> convertMouseEventToTabbedPane(_button, evt);<br /> }<br /> });<br /> add(_button);<br /> }<br /> }<br /> }<br /> /**<br /> * Dispatch event from specified component to current DnDTabbedPane.<br /> */<br /> private void convertMouseEventToTabbedPane(Component comp, MouseEvent e)<br /> {<br /> MouseEvent evt = SwingUtilities.convertMouseEvent(comp, e, this);<br /> dispatchEvent(evt);<br /> }</p> <p> /**<br /> * This method is used to handle the click event on the close button.<br /> */<br /> protected void clickCloseButton(ActionEvent e, int tabClosedIndex)<br /> {<br /> remove(tabClosedIndex);<br /> }<br /> }<br />