Перетаскивания группы файлов в виде дерева 6 Июнь 2009 by admin·0 Comments Этот совет Java Swing иллюстрирует метод реализации функциональности перетащить import javax.swing.*; import javax.swing.tree.*; import java.awt.dnd.*; import java.awt.datatransfer.*; import java.util.List; import java.util.Iterator; import java.awt.Point; import java.awt.Rectangle; import java.awt.Insets; import java.io.File; import java.io.IOException; public class FSTree extends JTree { public FSTree() { super(); init(); } public FSTree(TreeModel newModel) { super(newModel); init(); } public FSTree(TreeNode root) { super(root); init(); } public FSTree(TreeNode root, boolean asks) { super(root, asks); init(); } private void init() { // We don't want to export anything from this tree, only import setDragEnabled(false); setTransferHandler(new FSTransfer()); } public class FSTransfer extends TransferHandler { public boolean importData(JComponent comp, Transferable t) { // Make sure we have the right starting points if (!(comp instanceof FSTree)) { return false; } if (!t.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) { return false; } // Grab the tree, its model and the root node FSTree tree = (FSTree)comp; DefaultTreeModel model = (DefaultTreeModel)tree.getModel(); DefaultMutableTreeNode root = (DefaultMutableTreeNode)model.getRoot(); try { List data = (List)t.getTransferData(DataFlavor.javaFileListFlavor); Iterator i = data.iterator(); while (i.hasNext()) { File f = (File)i.next(); root.add(new DefaultMutableTreeNode(f.getName())); } model.reload(); return true; } catch (UnsupportedFlavorException ufe) { System.err.println("Ack! we should not be here.\nBad Flavor."); } catch (IOException ioe) { System.out.println("Something failed during import:\n" + ioe); } return false; } // We only support file lists on FSTrees... public boolean canImport(JComponent comp, DataFlavor[] transferFlavors) { if (comp instanceof FSTree) { for (int i = 0; i < transferFlavors.length; i++) { if (!transferFlavors[i].equals(DataFlavor.javaFileListFlavor)) { return false; } } return true; } return false; } } } other
