小程序 Java鼠标拖拽功能（源码）.rar

package net.swing; import java.awt.AlphaComposite; import java.awt.Component; import java.awt.Graphics2D; import java.awt.Point; import java.awt.Rectangle; import java.awt.Toolkit; import java.awt.datatransfer.DataFlavor; import java.awt.datatransfer.StringSelection; import java.awt.datatransfer.Transferable; import java.awt.datatransfer.UnsupportedFlavorException; import java.awt.dnd.DnDConstants; import java.awt.dnd.DragGestureEvent; import java.awt.dnd.DragGestureListener; import java.awt.dnd.DragSource; import java.awt.dnd.DragSourceDragEvent; import java.awt.dnd.DragSourceDropEvent; import java.awt.dnd.DragSourceEvent; import java.awt.dnd.DragSourceListener; import java.awt.dnd.DropTarget; import java.awt.dnd.DropTargetDragEvent; import java.awt.dnd.DropTargetDropEvent; import java.awt.dnd.DropTargetEvent; import java.awt.dnd.DropTargetListener; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.awt.geom.AffineTransform; import java.awt.geom.Rectangle2D; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.Iterator; import java.util.List; import javax.swing.Icon; import javax.swing.JLabel; import javax.swing.JTree; import javax.swing.Timer; import javax.swing.event.TreeExpansionEvent; import javax.swing.event.TreeExpansionListener; import javax.swing.filechooser.FileSystemView; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.DefaultTreeCellRenderer; import javax.swing.tree.DefaultTreeModel; import javax.swing.tree.TreePath; class DragTree extends JTree implements DragGestureListener, DragSourceListener, DropTargetListener { BufferedImage ghostImage; private Rectangle2D ghostRect = new Rectangle2D.Float(); private Point ptOffset = new Point(); private Point lastPoint = new Point(); private TreePath lastPath; private Timer hoverTimer; FileNode sourceNode; public DragTree() { DragSource dragSource = DragSource.getDefaultDragSource(); dragSource.createDefaultDragGestureRecognizer(this, // component where // drag originates DnDConstants.ACTION_COPY_OR_MOVE, // actions this); // drag gesture recognizer setModel(createTreeModel()); addTreeExpansionListener(new TreeExpansionListener() { public void treeCollapsed(TreeExpansionEvent e) { } public void treeExpanded(TreeExpansionEvent e) { TreePath path = e.getPath(); if (path != null) { FileNode node = (FileNode) path.getLastPathComponent(); if (!node.isExplored()) { DefaultTreeModel model = (DefaultTreeModel) getModel(); node.explore(); model.nodeStructureChanged(node); } } } }); this.setCellRenderer(new DefaultTreeCellRenderer() { public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) { TreePath tp = tree.getPathForRow(row); if (tp != null) { FileNode node = (FileNode) tp.getLastPathComponent(); File f = node.getFile(); try { Icon icon = FileSystemView.getFileSystemView() .getSystemIcon(f); this.setIcon(icon); this.setLeafIcon(icon); this.setOpenIcon(icon); this.setClosedIcon(icon); this.setDisabledIcon(icon); } catch (Exception e) { e.printStackTrace(); } } return super.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus); } }); super.setScrollsOnExpand(true); new DropTarget(this, DnDConstants.ACTION_COPY_OR_MOVE, this); // Set up a hover timer, so that a node will be automatically expanded // or collapsed // if the user lingers on it for more than a short time hoverTimer = new Timer(1000, new ActionListener() { public void actionPerformed(ActionEvent e) { if (lastPath == null) { return; } if (getRowForPath(lastPath) == 0) return; // Do nothing if we are hovering over the root node if (isExpanded(lastPath)) collapsePath(lastPath); else expandPath(lastPath); } }); hoverTimer.setRepeats(false); // Set timer to one-shot mode this.addKeyListener(new KeyAdapter() { public void keyPressed(KeyEvent e) { int code = e.getKeyCode(); int modifiers = e.getModifiers(); if (code == 'v' || code == 'V') { System.out.println("find v"); System.out.println("modifiers:" + modifiers + "\t" + ((modifiers & KeyEvent.CTRL_MASK) != 0)); } if ((modifiers & KeyEvent.CTRL_MASK) != 0 && (code == 'v' || code == 'V')) { Transferable tr = Toolkit.getDefaultToolkit() .getSystemClipboard().getContents(null); TreePath path = getSelectionPath(); if (path == null) { return; } FileNode node = (FileNode) path.getLastPathComponent(); if (node.isDirectory()) { System.out.println("file cp"); try { List list = (List) (tr .getTransferData(DataFlavor.javaFileListFlavor)); Iterator iterator = list.iterator(); File parent = node.getFile(); while (iterator.hasNext()) { File f = (File) iterator.next(); cp(f, new File(parent, f.getName())); } node.reexplore(); } catch (Exception ioe) { ioe.printStackTrace(); } updateUI(); } } } }); } public void dragGestureRecognized(DragGestureEvent e) { // drag anything ... TreePath path = getLeadSelectionPath(); if (path == null) return; FileNode node = (FileNode) path.getLastPathComponent(); sourceNode = node; // Work out the offset of the drag point from the TreePath bounding // rectangle origin Rectangle raPath = getPathBounds(path); Point ptDragOrigin = e.getDragOrigin(); ptOffset.setLocation(ptDragOrigin.x - raPath.x, ptDragOrigin.y - raPath.y); // Get the cell renderer (which is a JLabel) for the path being dragged int row = this.getRowForLocation(ptDragOrigin.x, ptDragOrigin.y); JLabel lbl = (JLabel) getCellRenderer().getTreeCellRendererComponent( this, // tree path.getLastPathComponent(), // value false, // isSelected (dont want a colored background) isExpanded(path), // isExpanded getModel().isLeaf(path.getLastPathComponent()), // isLeaf row, // row (not important for rendering) false // hasFocus (dont want a focus rectangle) ); lbl.setSize((int) raPath.getWidth(), (int) raPath.getHeight()); // <-- // The // layout // manager // would // normally // do // this // Get a buffered image of the selection for dragging a ghost image this.ghostImage = new BufferedImage((int) raPath.getWidth(), (int) raPath.getHeight(), BufferedImage.TYPE_INT_ARGB_PRE); Graphics2D g2 = ghostImage.createGraphics(); // Ask the cell renderer to paint itself into the BufferedImage g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC, 0.5f)); // Make the image ghostlike lbl.paint(g2); g2.dispose(); //this.getGraphics().drawImage(ghostImage, e.getDragOrigin().x, // e.getDragOrigin().y, this); e.startDrag(null, // cursor ghostImage, new Point(5, 5), new StringSelection(getFilename()), // transferable this); // drag source listener } public void dragDropEnd(DragSourceDropEvent e) { ghostImage = null; sourceNode = null; } public void dragEnter(DragSourceDragEvent e) { } public void dragExit(DragSourceEvent e) { if (!DragSource.isDragImageSupported()) { repaint(ghostRect.getBounds()); } } public void dragOver(DragSourceDragEvent e) { } public void dropActionChanged(DragSourceDragEvent e) { } public String getFilename() { TreePath path = getLeadSelectionPath(); FileNode node = (FileNode) path.getLastPathComponent(); return ((File) node.getUserObject()).getAbsolutePath(); } private DefaultTreeModel createTreeModel() { File root = FileSystemView.getFileSystemView().getRoots()[0]; FileNode rootNode = new FileNode(root); rootNode.explore(); return n